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    • 专利摘要:
    LED CIRCUIT ARRANGEMENT, LED LIGHT SOURCE FOR OPERATION IN A LED CIRCUIT ARRANGEMENT AND METHOD FOR OPERATING AN LED LIGHT SOURCE CONNECTED BY A REACTIVE ELEMENT WITH A DC OPERATING VOLTAGEThe invention relates to an arrangement of the LED circuit (1) with at least one voltage input (4), adapted to provide an operational voltage, a reactive element (6) connected in series with the aforementioned voltage input (4) and an LED light source (3). To allow the arrangement of the LED circuit (1) to be driven at an operating voltage, the LED light source (3) comprises a first and a second LED unit (8, 9), each having a light emitting diode. light, controllable switching means (10) for connecting said LED units (8, 9) with said reactive element (6) in a low voltage mode and a high voltage mode and a control unit (12). The LED light source (3) shows a first direct voltage in said low voltage mode and a second direct voltage in said high voltage mode, said second direct voltage being higher than said first direct voltage. The control unit (12) is adapted to control the current through the LED light source (3) by adjusting the switching medium (10) to the aforementioned low voltage mode when the current, supplied in the LED light source (3) ), corresponds to a first limit value (30) and setting the switching medium (10) to high voltage mode when the aforementioned current corresponds to a second limit value (31).
    公开号:BR112013009250A2
    申请号:R112013009250-5
    申请日:2011-10-13
    公开日:2020-10-06
    发明作者:Harald Josef Günther Radermacher；Toni Lopez；Matthias Wendt
    申请人:Koninklijke Philips Electronics N.V；
    IPC主号:
    专利说明:

    - the MD MM pa | "1/35 LED CIRCUIT ARRAY, LED LIGHT SOURCE FOR OPERATION IN A LED CIRCUIT ARRANGEMENT AND METHOD TO OPERATE A SOURCE OF LED LIGHT CONNECTED BY AN ELEMENT REACTIVE WITH A DC OPERATIONAL VOLTAGE
    FIELD OF THE INVENTION The present invention relates to an LED circuit layout, an LED light source and a method for. operate a layout of the LED circuit. Specifically, the present invention relates to driving a .- 10 arrangement of the LED circuit at an operating voltage while providing a safe and cost-effective configuration.
    BACKGROUND OF THE INVENTION Light emitting diodes (LEDs) are used for a wide variety of applications, including signaling, and currently to a large extent, general lighting applications. Depending on the application and the type of LED used, there are several designs of the driver circuits for the LEDs. Due to the exponential dependence between operating current and voltage, similarly to other diodes, LEDs are typically driven with a constant current power supply unit or driver circuit. More simply, the drive circuit can consist of a resistor in series to limit the maximum current brought to the light emitting diode in the event of a variation in the operating voltage. Certainly, due to the relatively high losses, such an arrangement may be particularly unsuitable for lighting applications, for example, in combination with high-power LEDs. In addition to the simple driver circuit mentioned above with a series resistor, other driver circuits exist in the art. However, such circuits are typically elaborate and thus expensive. Additionally, the circuit design in most cases needs to be adapted to the type and number of LEDs used, | |
    MD - 2/35
    Ú providing limited scalability. Thus, in particular for the emergent use of LEDs in general lighting applications, such circuits may be unsuitable. US 7,468,723 describes a driver for two LED columns that are coupled in series. The driver includes a boost converter that is arranged to supply a voltage; Still, the trigger. includes a switch that is attached to half of the LED columns attached in series. A 50% task cycle is used to control the switch. While the boost converter is enabled, one of the switches is on and the other is off. Such a configuration is not optimal with regard to brightness control, in particular flicker, and is inefficient in view of the required number of LEDs, as the LEDs are selectively turned on and off. Thus, the present invention aims to provide an LED circuit arrangement that allows efficient operation of the LED light source at a desired average clarity without substantial flicker.
    SUMMARY OF THE INVENTION The objective is obtained by an arrangement of the circuit | 7 of LED, according to claim 12, an LED light source, according to claim 13 and a method for operating, an LED light source, according to claim 13. The dependent claims refer to preferred embodiments of the invention. The basic idea of the invention is to provide an LED circuit layout, in which an LED light source is operable in a low voltage mode and a high voltage mode depending on a current level to provide current control through the LED light source. The present invention: then advantageously allows the activation of the light source of | LED with a simple and profitable voltage source, such as | | typical power supply unit.
    The layout of the LED circuit according to the invention comprises at least one voltage input, adapted to provide an operational voltage during operation, a reactive element, connected in series with the aforementioned voltage input, and at least one light source LED. The LED light source comprises a first and a first. second LED unit, each having at least one light emitting diode (LED), controllable switching means for connecting to the said LED unit with said reactive element in a low voltage mode and a high voltage mode and a control unit. In the aforementioned low voltage mode, the LED light source shows a first direct voltage. In high voltage mode, the LED light source shows a second direct voltage, higher than the aforementioned first direct voltage. The control unit is configured to define said switching means in said low voltage mode when an operational current supplied to said LED light source corresponds to a first current limit value and to define said switching means in said mode high voltage when the aforementioned current corresponds to 7 for a second current limit value. As mentioned above, the inventive arrangement of the LED circuit comprises a voltage input, adapted to provide an operational voltage to the said LED light source during operation. The voltage input can then comprise a suitable voltage controlled power supply unit or can be adapted to be connected to a suitable voltage source, for example, a suitable external power source. The internal / external power supply can be adapted to provide a nominal output voltage of 3.3V, 5V, 12V, 13.8V, 24V or 48V, for example, and can be charged at maximum current | - - and - SN ——
    : 4/35 7 defined. Such a power supply can, for example, be a pluggable transformer from the mains with a rectifier or a battery. Optionally, the aforementioned power supply may comprise the filter circuit. The voltage input can then, for example, comprise two electrical terminals, such as solder islands, wire islands, or any suitable conductor or plug for power connection.
    : Although in accordance with the present invention, the term "operating voltage" refers to a unipolar voltage, eg. For example, a DC voltage, the inventive arrangement of the LED circuit allows for a certain variation in voltage, such as a voltage "wave" of a DC voltage, provided with a line from the electrical network through a typical unstabilized rectifier. The voltage input can certainly comprise additional electrical or mechanical components, for example, in the case of the circuit arrangement, a corresponding separable electrical connector is provided to be removed from the voltage source.
    The reactive element is connected in series with the voltage input to provide the LED unit with "reactive power". The reactive element can then be arranged between the voltage input and the LED light source, but can alternatively or in part be integral with one of the components' previously mentioned, depending on the respective application.
    The reactive element can, for example, be arranged between one of the electrical terminals of the voltage input and a corresponding terminal of the LED light source.
    The reactive element can be any suitable type of energy storage, such as magnetic field energy storage, for example, an inductor, a coupled inductor, a transformer, a suitable conductor or any type of electrical component, providing inductive properties. Preferably, however, the reactive element is an inductor, | o o o -
    for example, a coil of the type and suitable inductance. The arrangement of the LED circuit according to the invention further comprises the aforementioned LED light source having a first and a second LED unit. The first and second LED units comprise at least one light emitting diode which, in terms of the present invention, can comprise any type of light source in the solid state,. such as an organic LED, an inorganic LED or a solid-state laser, for example, a laser diode.
    4 10 For general lighting applications, the LED unit can preferably comprise at least one high power LED, that is, having a luminous flux greater than 1 Im. Preferably, the aforementioned high power LED provides a luminous flux greater than 20 lm, more preferably greater than 50 lm. For retrofit applications, it is especially preferred that the total flow of the LED light source is in the range of 300 lm to 10,000 lm.
    More preferably, the light emitting diodes of said first and / or second LED units are integrally formed in a single semiconductor matrix or substrate to provide a compact configuration.
    'LED units can certainly comprise other electrical or electronic components such as a drive', for example, to define brightness and or color, a soft state or a filtering capacitor. Each LED unit can comprise more than one LED, for example, to increase the luminous flux of the LED light source or in applications where color control of the emitted light is desired, for example, using RGB LEDs.
    According to the invention, the LED light source further comprises controllable switching means for connecting the first and second LED units to the reactive element in a low voltage mode and a high voltage mode.
    o o MM Ts 6/35 The switching means can then be of any suitable type to allow the LED units to be connected with the aforementioned reactive element in low voltage mode or in high voltage mode. Certainly, another electrical circuit may be present to carry out the aforementioned high and low voltage modes. However, the switching means allow you to control the respective operating mode, that is,: high and low voltage mode, respectively. The switching means should preferably be adapted to. 10 electrical specifications of the application in terms of voltage and maximum current, but also with reference to the switching frequency, that is, it must be repeatedly set to low voltage mode and high voltage mode. More preferably, the switching means are adapted in combination with the reactive element and the operating voltage to provide a switching frequency higher than 20 kHz.
    The switching means may comprise one or more suitable electrical or electronic switching devices, for example, one or more transistors, in particular one or more field and / or bipolar transistors. Preferably, the switching means comprises one or more º MOSFETSs, which are particularly advantageous in terms of the switching current and frequency range. 'The switching means are controlled by the aforementioned control unit over a suitable wired or wireless control connection. The control unit is configured to control the aforementioned means of switching to low voltage mode when an operational current, supplied to the aforementioned | LED light source, corresponds to the aforementioned first limit value and to control the aforementioned means of switching to high voltage mode when the aforementioned current supplied corresponds | to the second limit value. The control unit is then | adapted to control the switching means in the room | | | :
    the current level during operation, that is, the current through the LED light source, for example, when an operational voltage is provided to the circuit at the voltage input.
    The control unit can be of any suitable type that allows control of the switching means as described above. The control unit can thus comprise integrated and / or discrete electronic or electrical components, a microprocessor and / or one. 10 computer, for example, with adequate programming. Preferably, the control unit is integrated with the switching means to provide a more compact configuration.
    The first and second limit values can be fixed setpoint values, for example, factory setting according to the respective application, for example, according to the type and current consumption of the LEDs of the aforementioned first and second LED. Alternatively, the first and second limit values can be variable, for example, stored in a suitable memory. In this case, a user interface can be provided to allow the user or installer to set the threshold values.
    Alternatively or additionally, the limit values can be adjusted or influenced by a feedback unit, for example, measuring the luminous flux of the LED units during operation.
    According to the invention, the first and second limit values refer to the defined current levels, so that the control unit can set the operating mode of the switching means correctly to provide control based on the current. Thus, the mode of operation of the switching means is defined according to the level of the operating current. The control unit controls the media | and DMA or switching to operate in low voltage mode when the operating current corresponds to the above mentioned limit value. Certainly, the switching means are controlled to operate in high voltage mode when the current supplied corresponds to the mentioned limit value.
    The two modes of operation of the switching means differ in the direct voltage of the LED light source. The term "direct voltage from the LED light source" in the present context refers to any voltage drop by the LED light source .- 10 when a voltage is applied to the LED light source, for example, over the input of voltage.
    The entire voltage drop according to the first direct voltage, then in the low voltage mode, is less than the voltage drop according to the second direct voltage, that is, in the high voltage mode.
    Assuming an operating voltage that changes slowly or relatively constant, the different voltage drop of the LED light source advantageously allows to control the current, since the reactive element in series decouples the operating voltage from the voltage by the LED units to some degree and provides a current to the LED light source on. depending on the respective voltage level. For example, in low voltage mode, the reactive element can be configured 'to operate in a load mode, that is, to store energy, resulting in an increase in current. In high voltage mode, the reactive element can certainly be operated in a discharge mode, so that the current reduces successively. Thus, the inventive layout of the circuit provides current regulation through the first and second LED units within a control range according to the first and second limit values. Thus, it is possible to operate the LED circuit layout with a voltage source instead of a fixed current source or to elaborate the | h MM MM | 9/35 current control circuit.
    The layout of the LED circuit and / or the LED light source can certainly comprise other components, such as a housing, one or more sockets, a smoothing stage, a scintillation filter circuit and / or other control circuit, for example example, to define the color of the light emitted in the case of at least one RGB LED unit. Additionally,. a communication interface may preferably be present to receive control commands and / or inform .- 10 status information, for example, and a wall-mounted dimmer via a 0-10 V control signal, Dali, DMX, Ethernet, WLAN, Zigbee or similar.
    As mentioned above, the first and second limit values can be defined according to the application and in particular according to the current levels of the LED units. According to a preferred embodiment of the invention, the current corresponding to the first limit value is less than the current corresponding to the second limit value.
    In particular in the latter case, the control unit is preferably configured to control the aforementioned switching means to operate in low voltage mode when the operating current is less and / or equal to the said first 'limit value. More preferably, the control unit is additionally configured to control said switching means to operate in high voltage mode when the operating current is higher and / or equal to the said second limit value.
    Preferably, in the low voltage mode, the direct voltage of the said LED light sources, that is, the first direct voltage, is less than the said operational voltage. More preferably, the direct voltage of the aforementioned LED light sources in the high voltage mode, that is, the second voltage | and
    - 10/35 direct, it is higher than the operating voltage.
    The present realization allows to operate the layout of the LED circuit in a switching mode control, for example, corresponding to the operation of a switched mode power supply (SMPS), as a boost converter, providing another improved and flexible control.
    According to the present embodiment, the first. direct voltage of the LED light source in low voltage mode, for example, all direct voltage of the LED units, is. 10 less than the operating voltage. Correspondingly, a voltage drop is present by the reactive element in this mode of operation, resulting in an increase in current. In high voltage mode, the second direct voltage of the LED light source is higher than the operating voltage, resulting in a negative voltage by the reactive element, which, for example, can be a series inductance, as mentioned above. Certainly, the current reduces. Since the reactive element, due to the behavior of energy storage, tries to maintain the current level, the voltage applied to LED light sources in high voltage mode is higher than the operating voltage, allowing a flow of current through the 'LED light source. Thus, the circuit according to the present embodiment corresponds to a boost converter circuit.
    Preferably, the switching means are adapted for continuous operation, so that the LED units are continuously energized, that is, connected with the reactive element in both switching modes. The present embodiment advantageously reduces optical flicker as both LED units are continuously supplied with energy and thus continuously generate light.
    In addition, the switching frequency of the switching means can advantageously be increased, since the | o MM o o o - -
    B 11/35 intrinsic capacitance of the LED units is not completely discharged.
    In accordance with a development of the invention, the switching means are adapted so that in said low direct voltage mode, said first and second LED units are connected in parallel to each other.
    Preferably, the switching means is further adapted to connect the first and second LED units in series with each other in the mode. High tension.
    The present realization. 10 advantageously allows another simplified circuit arrangement.
    The parallel arrangement of the LED units provides a relatively low first direct voltage from the LED light source, which according to this realization corresponds; substantially to the direct voltage of the parallel connection of said first and second LED unit.
    The second direct voltage of the LED light source in the high voltage mode, that is, in series connection of the LED units, corresponds substantially to the sum of the direct voltages of the first and the second LED unit.
    Thus, the present embodiment provides the previously mentioned control of the aforementioned voltage modes: high and low with another simplified circuit design and still advantageously allow continuous operation to 'reduce the optical flicker in the light emission of the LED units. if.
    The switching means can be provided to switch between said parallel and series operation according to any suitable design.
    Preferably, the switching means comprises at least two switching devices for connecting the LED units both parallel and in series with each other.
    For example, the two switching devices in a first switching state can be provided for | ms - - the un connect the LED units parallel to each other. The entire arrangement of the first and second LED units in this case is connected in series with the reactive element and the voltage input, respectively.
    In a second state, the first and second LED units are connected in series with each other, for example, over a suitable bridge circuit comprising a reverse voltage protection diode and / or other switching device, such as a MOSFET.
    Also here, the series connection of the two LED units is connected in series with the element. 10 reactive.
    As discussed above, in the case that the first and second LED units are connected in series with each other, the direct voltage of the LED light source corresponds to the sum of the direct voltages of the first and second LED units.
    The direct voltage of the first and second LED units can be chosen according to the application.
    To obtain a high quality light emission for most: applications, it is preferred that the direct voltage of the aforementioned first LED unit substantially corresponds to the direct voltage of the second LED unit, which results in a particularly advantageous voltage index, for example example, close to 1: 1. . Certainly, it can be difficult to provide the aforementioned first and second LED units with identical direct voltages, in particular due to the manufacturing tolerances of a typical mass manufacturing process.
    However, a deviation results in uneven current sharing in the event that the aforementioned first and second LED units are connected parallel to each other, causing uneven strength for the LED units and uneven light generation.
    In this way, the direct voltage of said first LED unit is preferably in the range of 90-110% of the direct voltage of said second LED unit.
    The appropriate voltage range may also depend on the | PEA o o - ——
    13/35 Ú resistance characteristics of the LEDs used. The steeper: the steeper the current-voltage curve of the LEDs, that is, the | LED units, as high as possible: current sharing “incompatibility” can be | 5 for a given difference between direct voltages. This way, as an alternative or in addition to a requirement | of direct voltage compatibility, LED units can be adapted to a direct voltage compatibility defined at a given voltage, for example, defined according to—— 10 for the particular application, in this case, at a given direct voltage, the current of the The first LED unit should substantially match the current of the second LED unit, for example, in a range of 90-110% of the current of the second LED unit.
    According to a development of the invention, the switching means are controlled by the control unit to have a switching frequency of 400 Hz to 40 MHz, preferably 16 kHz to 10 MHz and more preferably 20 kHz to 4 MHz. The present embodiment advantageously provides another reduced optical flicker, improving the light output of the LED circuit layout.
    and. Preferably, the control unit comprises the current detection circuit to determine the current M through the LED light source. The current detection circuit can be of any suitable type to allow reliable detection during the operation of the LED circuit layout. The current detection circuit should provide a signal to the control unit, corresponding to the current current level of the current through the LED light source and / or the LED units during operation. The current detection circuit can be integrally formed with the aforementioned control unit, for example, in a corresponding microcontroller, or it can be provided
    .— 14/35 separately and connected to the control unit over a suitable wired or wireless signaling connection.
    Preferably, the current detection circuit comprises a current-sensitive resistor, connected in series with the first and second LED units, to provide a voltage signal to the control unit, which corresponds to the current through the LED units. . More preferably, the control unit is operated with an auxiliary supply voltage, generated from the - 10 voltages present in the LED light source during operation, such as the operating voltage or the direct voltage of one of the LED units, through the circuit suitable, for example, an uncoupling diode, a filter capacitor and a linear voltage regulator.
    Generating the auxiliary supply voltage from the voltages already present in the LED light source is advantageous, as the LED light source does not need additional terminals to supply an externally generated auxiliary supply voltage.
    As discussed above, the light emitting diodes of the LED units are preferably formed in a common semiconductor matrix, substrate or module.
    In particular, when high power LEDs are used, several LEDs, ie pn-junctions, can be formed in a 'single matrix to provide the luminous flux necessary for lighting or general lighting applications.
    Certainly, it is possible, particularly in the latter case, to form the first and second LED units in the aforementioned common matrix.
    According to another development of the invention, the LED units, the switching means and / or the control unit are integrally formed, for example, in a single matrix or in a common package or module.
    The present embodiment allows for another reduction in the size of the circuit's inventive layout, providing a highly | - = - '
    compact.
    The LED units, the switching means and / or the control unit can be provided in a single semiconductor matrix to provide another simplified manufacturing process.
    Alternatively, an electrical subassembly may be present to mechanically support and / or electrically R connect the LED units, the subassembly of which comprises the switching means and / or the control unit. The subassembly .- 10 can certainly comprise other electrical or mechanical elements, such as, for example, a heat sink or heat pipe to dissipate heat generated by LED units or other electronic components of the LED light source.
    It is also preferred that the reactive element is formed integrally with the LED light sources, that is, with the LED units, the switching means and / or the control unit. More preferably, the reactive element is integrally formed with the aforementioned electrical subassembly.
    According to another preferred embodiment of the invention, the LED light source is a two pole device. In terms of the present explanation, a. two-pole or two-pin is an electronic component having two electrical terminals for connection to the aforementioned 'layout of the LED circuit.
    The present embodiment is particularly advantageous in terms of mounting the LED light source on a printed circuit board. Although, as discussed above, the LED light source comprises an internal current control, a user can integrate the device in the same way as a common prior art LED light source in a PCB layout. The LED light source can then be considered to have a "quasi-anode" and a "quasi-cathode".
    According to a development of the invention, the | "and - - the LED circuit layout comprises more than one LED light source, connected in series with the voltage input.
    According to the present embodiment, the luminous flux of the inventive layout of the circuit can be further increased by a corresponding series connection of various LED light sources, as explained above. In particular, the present embodiment allows the use of a single LED circuit arrangement with a single reactive element .- 10 to which the various LED light sources are connected.
    Since the voltage input provides an operational voltage and the current is controlled by each of the LED light sources internally, no “Other circuit adaptation is required.
    Certainly, however, in the case that a standard power supply is used and connected to the voltage input, the voltage, current and power must allow the operation of the respective number of LED light sources. Additionally or alternatively, the layout of the LED circuit is preferably provided with one or more LEDs according to the prior art, connected in series with one or more of the aforementioned inventive LED light sources and at least one said reactive element . Such a combined arrangement of the 'circuit is particularly cost effective and at the same time provides a high luminous flux.
    In addition, several LED circuit arrangements can be connected in parallel to the aforementioned power supply to increase the luminous flux.
    The switching frequency and thus the duty cycle of the switching operation mode depends mainly on the operating voltage. Since the current through the first and second LED units may differ in the high and low voltage modes, the luminous flux in both modes can:. > - DN differ, resulting in the dependence of the luminous flux on the operational voltage.
    While this can be advantageous in that | allows the luminous flux to be easily defined in a certain range, in particular in the case that a source of | 5 unstabilized feed is used, the quality of | light emission may be impaired.
    According to another preferred embodiment of the invention, the control unit is configured to adapt the | 'first and / or the second limit value, so that the | . 10 current through the LED light sources corresponds to a predefined average lamp current.
    Since the luminous flux depends on the average current of the lamp, the present realization allows to define the luminous flux independently of the input voltage level, thus providing another stabilized light emission.
    The average lamp current can be set according to the application, for example, by a user with a corresponding user interface and stored in an appropriate memory or by factory setting.
    Alternatively or additionally, the average current of the lamp can be variable or adapted by the control unit, for example, using a return device. provided to measure the luminous flux emitted and to define the average current of the lamp at a given flux from the set point. : The present embodiment then advantageously allows to compensate, for example, the effects of aging and temperature.
    Preferably, the control unit is configured to determine the input voltage, for example, using a voltage measurement circuit, and to adapt the average current of the lamp certainly.
    In this case, the control unit can be configured to set the average lamp current to provide a constant luminous flux, largely independent of the input voltage.
    Alternatively or additionally, the control unit can be | o o o PA
    18/35 o configured to set the average current of the lamp according to a given relationship with the input voltage. Certainly, it is possible to define the luminous flux of the LED light sources by controlling the input voltage, that is, without the need for another control signal or user interface. More preferably, the control unit is configured to adapt the first, for example, lower current limit value to provide the preset average lamp current. .
    2 110 The LED light source according to the invention is adapted for operation with an LED circuit layout, as discussed above. The LED light source comprises a first and a second LED unit, each having at least one light emitting diode, controllable switching means for connecting said LED units with a reactive element in a low voltage mode and a high voltage mode, and a control unit. In the aforementioned low voltage mode, the LED light source shows a first direct voltage. In high voltage mode, the LED light source shows a second direct voltage, higher than the aforementioned first direct voltage.
    'The control unit is configured to define the aforementioned means of switching to the aforementioned low voltage mode' when a current, supplied by the aforementioned supply voltage, corresponds to a first limit value and to define the aforementioned means of switching to the aforementioned mode of high voltage when the aforementioned current corresponds to a second limit value. Of course, the LED light source can preferably be adapted to the preferred embodiments above.
    According to the inventive method for operating an LED light source with an operating voltage, the aforementioned LED light source comprises a first and a second | and - and the o -
    - 19/35 'LED unit, each having at least one light emitting diode, and controllable switching means for connecting said LED units with a reactive element in a low voltage mode and a high voltage mode. In the aforementioned low voltage mode, the LED light source shows a first direct voltage. In high voltage mode, the LED light source shows a second direct voltage, higher than the one mentioned. first direct voltage. The switching means are set to the said low voltage mode when a current. 10 operational, supplied to the aforementioned LED light source, corresponds to a first limit value and are defined to the aforementioned high voltage mode when the said current supplied corresponds to a second limit value. Of course, the LED light source can preferably be operated using an LED circuit arrangement in accordance with the above achievements.
    BRIEF DESCRIPTION OF THE DRAWINGS The objects, characteristics and advantages above, € others, of the present invention will become evident from the description of the preferred embodiments, in which: Figure 1 shows a schematic diagram of the circuit of a layout of the LED circuit with an LED light source according to a first embodiment of the 'invention. Figure 2 shows a time diagram of the current in the arrangement of the LED circuit according to figure 1 during operation. Figure 3a shows a cross-sectional view of a LED light source according to a second embodiment, Figure 3b shows a cross-sectional view of an LED light source according to a third embodiment, Figure 3c shows a cross-sectional view of one | LED light source according to a fourth embodiment, the
    - 20/35 Figure 4 shows a schematic diagram of the circuit of the LED circuit layout according to another embodiment of the invention and Figure 5 shows a schematic diagram of the circuit of the LED circuit layout according to another embodiment of the invention.
    DESCRIPTION OF THE ACCOMPLISHMENTS Figure 1 shows a schematic diagram of the circuit of an arrangement of the LED circuit 1 according to. 10 a first embodiment of the present invention. The layout of the LED circuit 1 comprises an LED supply circuit 2 connected with an LED light source 3. The LED light source 3 is formed as a single module or chip, as will be explained below with reference to the figure 2. The LED supply circuit 2 comprises a voltage input 4a and a voltage input 4b, that is, according to the present embodiment two terminals for connection to a supply voltage 5 which provides a direct current voltage of 15 V. Supply 5 may, for example, be a unit of the switching mode power supply connected to a corresponding mains line and including a rectifier to supply the aforementioned direct current voltage. The LED supply circuit 2 further comprises' a reactive element 6, that is, in the present example a coil with an inductance of 100 pH, connected in series between the voltage input 4, and thus the supply voltage 5, € at the LED light source 3. The LED light source 3 comprises two terminals 7 a and 7b for connection to the LED supply circuit 2. The LED light source 3 according to the present example can then be referred to as a device "2-pole" or "2-pin", so that integrating the LED light source 3 into an existing power circuit is easy | two. -
    = 21/35 'possible. The terminals 7a and 7b according to the present embodiment are provided as metallic solder islands for connection to a printed circuit board, for example. The LED light source 3 further comprises a first LED unit 8 and a second LED unit 9, which according to The present example comprises three high power light-emitting diodes 48 (not shown in figure 1) arranged in series , resulting in a defined direct voltage of 'approximately 9 V. To connect. the first and the second .- 10 LED unit 8, 9 with the reactive element 6 and thus with the supply voltage 5, switching means 10 are provided, comprising, according to the present embodiment, two controllable switches 11. Switches 11 are operated by a control unit 12 over a suitable control connection, indicated by the dotted line in the figure
    1. According to the present example, the control unit 12 comprises a microcontroller properly programmed for current control, as discussed below. The control unit 12 is further connected with the current detector 13 to measure the current through the arrangement of the circuit 1. The switching means 10 are provided to operate the * LED light source 1 in a high voltage mode and a low voltage mode. ] In high voltage mode, switches 11 are opened, as shown in figure 1. The first and second LED units 8, 9 are certainly connected in series with each other and the reactive element 6 on the bridge circuit 14 comprising a diode reverse voltage protection 15 resulting in a first defined general direct voltage of the LED light source 3. In low voltage mode, both switches 11 are closed, so that the first and second LED units 8, 9 are connected parallel to each other, resulting in a second defined direct voltage from the source | - oo oo o o i 22/35 LED light 3. In this mode, the reverse voltage protection diode 15 prevents a short circuit.
    The LED light source 3 can thus be defined in two modes.
    The entire direct voltage of the LED light source 3 and thus the LED units 8, 9, for example, measured between the two terminals 7a and 7b, can certainly be defined at a first direct voltage of the LED light source of 9 V in low voltage mode and a second direct voltage from the 18 V 3 LED light source in 'high voltage mode.
    Certainly, all the direct tension of the. 10 LED light source 3 in low voltage mode is lower than the voltage of the supply voltage 5. In high voltage mode, the direct voltage is higher than the supplied voltage.
    The principle of operation of the inventive arrangement of the LED circuit 1 according to the realization of figure 1 is explained below with reference to the time diagram of figure 2. In the figure, the current IL through the reactive element 6 and thus through the terminals 7a and 7b of the LED light source 3 and the current Ixmc They are shown over time, starting with the connection of the LED1 circuit layout at the power, that is, at the supply voltage 5. The Inc current refers to the effective current por] LED junction of each LED unit 8, 9. Depending on the LED light source 3 being in high or low voltage mode: 33, the TI current flows through the two LED units 8 and 9 in parallel or in parallel. series, respectively.
    Thus, the effective current Inc per LED unit 8, 9 corresponds to the current Tr in the high voltage mode 33 and half of the current Ir in the low voltage mode 32 since here, the two LED units 8, 9 are connected in parallel, so that the current T is shared.
    According to the present example, LED units 8, 9 are assumed to show the corresponding electrical characteristics, that is, the direct voltage index of LED units 8, 9 is 1: 1. Thus, the | and - the current Tr is shared equally. As mentioned above, the control unit 12 is adapted to measure the current TI, through the LED light source 3, using the current detector 13. The control unit 12 is adapted to control the switches 11 of the switching means 10 of the aforementioned low voltage mode, that is, the parallel connection, in the aforementioned series connection. The control unit 12 is: programmed with a first current limit value 30, according to the present example, 700mMA and a second value. 10 current limit 31 of 1400mA, ie higher than The first limit 30 by the "current fluctuation" Ai of 700mA. When the measured current is lower or corresponds to the aforementioned first limit value 30, the control unit 12 controls the switching means 10 to operate in low voltage mode
    32. Even if the current II still increases, the switching means 10 remain in low voltage mode. In case the current reaches, that is, it is equal to or higher than O mentioned according to limit value 31, switching means 10 are controlled to operate in high voltage mode 33. Again, switching means 10 are kept in mode of high voltage 33 until the current T is equal to or less than O 'first limit value 30, Thus, the use can adequately be made of the current control according to the invention, which' allows to maintain the current TI, in the operational states, ie, under normal operating conditions, between the first and second limit values. The present example results in a switching frequency of approximately 30kHz. The task cycle or switching frequency of the switching means 10 certainly depends on the limit values 30, 31, and thus on the fluctuation of the current ni, the inductance of the reactive element 6 and the characteristics, that is, particularly the direct voltages, of the units LEDs 8, 9. To provide a switching frequency in the range 20kHz to | and PRA o]
    4MHz with the previously mentioned limit values, an inductance of approximately 150pH to 750 nH is particularly preferred.
    The operation of the configuration then substantially corresponds to the operation of a configuration converter, so that a task cycle or switching frequency can be defined according to the respective application by: a technician in the subject, using the criteria and formulas: known from drawing. . 10 Referring to figure 2, the operation of control unit 12 is initiated by connecting circuit 1 to supply voltage 5. Initially, control unit 12 | defines switching means 10 in low voltage mode 32. Current T, will certainly be zero,
    Because of low voltage mode 32, all voltage | direct current of the LED light source 3 is less than the operating voltage of the supply voltage 5, as discussed above, a voltage drop by the reactive element 6 | is present.
    Certainly, the current TI, increases during the | low voltage / phase 32 mode. When the current Ir reaches the second limit value 7 31, the control unit 12 sets the switches 11 of the switching means 10 in the open state, ie the 'high voltage / phase 33 mode All direct voltage from the LED units
    8, 9 in this mode is higher than the voltage of the supply voltage 5 due to the series connection. However, since the reactive element 6 will try to resist the changes of Ir, the voltage at terminals 7 of the LED light source 3 it increases to a level where current flow through the series connection of the first LED unit 8, second LED unit 9 and reverse voltage protection diode 15 is possible.
    The increase in voltage occurs at the same time as the switch-off procedure 10, resulting in a current flow | o = t - - = -: | continuous and thus continuous operation of the LEDs of the first and second LED units 8, 9. Since all the direct voltage according to the present high voltage mode 33 is higher than the operating voltage of the supply voltage 5, the voltage by the reactive element 6 is negative, resulting in a reduction of the Ir current in the high voltage mode 33, as shown in figure 2. When the Ir current reaches the first limit value 30, the control unit 12 controls the switches 11 dos - 10 switching means 10 again to operate in low voltage mode 32, that is, the mode of parallel operation of the first and second LED units 8, 59. Certainly, the current | Ir, increases in the subsequent low voltage mode 32 and the operation discussed above is repeated, The operation of the control unit 12 of the LED light source 3 thus provides current control within the two limit values 30, 31 and thus allows the operation of the LED light source 3 with a supply voltage 5, while stabilizing the current, Thus, an elaborate current regulator can be advantageously omitted.
    In addition, LEDs 48 of LED units 8, 9 are continuously supplied with the operating current, resulting. in a light emission without dark periods and substantially without flicker, due to the high switching frequency.
    When, the circuit layout 1 is operated with a higher voltage than the entire direct voltage of the LED light source 3 in high voltage mode 33, the internal current regulation is not active.
    Also, the LED light source 3 can then be operated as a typical 48 LED column, where the current needs to be controlled externally.
    Certainly, the mnesna Í light source 3, which operates as a self-control device within a given supply voltage range, can be operated as a high voltage LED light source 3 | - DO o -
    . 26/35 normal exposed to a higher supply voltage than all direct voltage in high voltage mode 33. Here, a current limiting device must be provided externally. The LED light source 3 and the layout of circuit 1 are therefore highly versatile. Certainly, the electrical characteristics as well as the current limit values. they must be adapted according to the respective application e. particularly with respect to the voltage supplied and the. specific electrical components used. However, such -— 10 adaptation can be conducted by the person skilled in the art.
    As discussed above, the LED light source 3 can be formed as an integrated module, thus having an advantageously small form factor. Figure 3a shows an embodiment of a light source 3 'in a transverse view substantially corresponding to the embodiment of figure 1. As shown, the first and second LED units 8, 9 are formed from an epitaxial semiconductor layer 20a, 20b as known in the art, comprising the semiconductor structures of the diode. To provide an emission of white light, the phosphorus layer 21a, 21b is provided on top of the epitaxial semiconductor layer 20a, 20b. The layers 'mentioned above 20a, 20b, 21a, 21b of module 3' of the LED light source are formed in a standard S semiconductor manufacturing process, allowing for a "cost efficient" configuration. The semiconductor layer 20a, 20b is connected in an electrical subassembly 23 through the weld joints 22 to provide the necessary electrical connections and mechanical fixation.
    Electrical subassembly 23 comprises, as shown in figure 3a, the remaining electrical components of the LED light source 3 'shown in figure 1, namely the switching means 10, the control unit 12, the current detector 13 and the bridge circuit 14 with the diode
    27/35: reverse voltage protection 15. For clarification reasons, not all components previously mentioned are shown in figure 3a. Electrical subassembly 23 is also formed by a standard known semiconductor ceramic or printed circuit board manufacturing process. The entire arrangement can be connected to the LED supply circuit 2 (not shown in figure 3a) on the corresponding solder terminals 7a and 7b. An interface of the] heat sink 24 is provided to dissipate heat, generated. 10 by LED units 8, 9 and electrical subassembly 23. Figure 3b shows another realization of a 3 "LED light source. The realization of figure 3b corresponds substantially to the realization of figure 3a with the exception of another inductive layer 25 , which serves as a 6 'reactive element. Certainly, the 3 "LED light source provides an integrated configuration, so that the 3" LED light source is easily connected to supply voltage 5 at voltage input 4a and 4b Figure 3c shows another realization of the inventive 3 "LED light source. The realization of figure 3c corresponds to | "substantially to the realization of figure 3a, with the exception that | here no electrical subassembly 23 is present. | 'Certainly, the first and second LED units 8, 9 are connected via welding joints 22 on a printed circuit board 26 comprising other components | previously mentioned of the 3 "LED light source, that is, | controllable switching means 10, control unit 12, | current detector 13 and bridge circuit 14 (not shown in figure 3c).
    Figure 4 shows a schematic diagram of the circuit of an arrangement of the LED circuit 1 'according to another embodiment.
    | PRA - e:
    The realization of the arrangement of the circuit 1 'according to figure 4 corresponds substantially to the realization explained above with reference to 1, with the exception of the modified switching means 10' and control unit 12 '. The switching means 10 'according to the present example comprises two MOSFETS 40a & and 40b, controlled by a control unit 12'. The control unit 12 'according to:. Figure 4 comprises a flip-flop device 46, output Q of which is connected to the door trigger .- 10 47. The door trigger 47 serves to amplify the signal of the flip-flop device 46 to a level suitable for activate the MOSFET 40 door. According to the present example, MOSFET 40a is of the N channel type, while the MOSFET 40b is of the P channel type. Depending on the specific type of MOSFET 40a, 40b used, the level change may not be required to drive the P channel MOSFET 40b, that is, if the high direct voltage is less than the allowed P-channel MOSFET 40b port voltage. Various concepts and ICS actuators to drive the MOSFET door exist in the art. For the previously mentioned integrated device, a suitable circuit is perceived in subassembly 23, considering the 7 input characteristics of MOSFETs 40, the voltage levels and the expected switching frequency. The control unit] 12 'further comprises a first comparator 44 and a second comparator 45 connected to a first voltage reference generator 42 and second voltage reference generator 43, respectively. Comparators 44, 45 compare the voltage levels driven to their input connections. If the voltage at the respective non-inverting input (marked with a "+" sign in figure 4) is higher than the voltage at the other respective inverting input, the signal sent to the flip-flop device 46 is high. Certainly, the signal emitted is low if the voltage in the REREEENEEEA -
    -: 29/35 non-inverting input is less than the voltage at the inverting input.
    Comparators 44, 45 must display a voltage range of the correct common mode to allow the desired switching operation.
    For high efficiency, the voltage drop at detection resistor 41 must be very small, for example, | less than 100 mV.
    Thus, comparators 44, 45 must operate with an input signal close to the ground potential,. which can be provided as the most negative supply voltage.
    Various types of comparators for the present application are available on the market, typically referred to as "single feed" comparators or "edge-to-edge entry". More simply, a suitable differential amplifier can be used as a comparator.
    The voltage reference generator 42 may comprise individual inclined zener diodes, bandgap references or simple voltage dividers energized from a common auxiliary supply of an appropriate voltage level and stability.
    The first and the second comparator 44, 45 are connected with the current detector 13, which, according to the present example, comprises a resistor sensitive to the 'current 41. The resistor 41 provides a voltage to the first and second comparators 44, 45, corresponding to this one: current through lamp 3 "". Comparators 44, 45 compare the signal with the reference voltages provided by said first and said second voltage reference generator 42, 43, qe are defined to correspond to the first and second current limit values 30, 31. During initialization phase, at the beginning of the device, Comparator 45 generates a high signal by adjusting the flip-flop device 46. The Q-output of flip-flop 46 is certainly high, causing MOSFETsS 40 to be in the closed state.
    The 3 "" LED light source is then set to voltage mode | o o -
    - 30/35 low. When the voltage drop across resistor 41 reaches the first limit value 30, comparator 45 generates a low emitted signal, but due to the flip-flop device 46, the switches will remain in the closed state. When the voltage drop by resistor 41 reaches the second limit value 31, that is, the voltage defined by the second voltage reference generator 43, comparator 44 generates a high emitted signal, readjusting the flip-flop device 46, so that MOSFETS 40 are deactivated, that is, adjust to the - 10 open state. The 3 "" LED light source is then set to high voltage mode, resulting in a current reduction [x as discussed above with reference to figure 2. The realization according to figure 4 provides a simple configuration and then cost efficient "3" LED light source. As discussed above, the first and second current limit values 30, 31 are set by the corresponding first and second voltage reference generator 42, 43. Although in both modes, ie Low voltage mode and high voltage mode, both LED units 8, 9 (each comprising single LEDs 48) are continuously provided with an operating current, the luminous flux 1] in both modes it certainly differs due to the switching of a parallel connection to a series connection of: LED unit 8, 9. In this way, the luminous flux of LED unit 8, 9 depends on the task cycle of the control and so on. less to some extent in the voltage of the supply voltage 5; while it may be advantageous to be able to control the luminous flux by varying the operating voltage between the high and low direct voltages, the dependence may be undesirable to operate the operating circuit 1'with a voltage source not sufficiently stabilized 5. Figure 5 shows a schematic diagram "of the circuit of a 1" LED circuit arrangement according to
    EEEEESESESSSEEESSEREREEEAAA | and -
    : 31/35 with another embodiment of the invention.
    The realization of figure 5 corresponds substantially to the realization explained above with reference to figure 4, with the exception of the control unit 12 "and the first and second LED units 8 ', 9'. With reference to figure 5, the first and the second LED unit 8 ', 9' comprises only a single LED 48. The control unit 12 "comprises another voltage source 52 which determines the difference between the first and second limit values 30, 31 and thus determines the fluctuation of the current ni da. 10 TI current, through reactive element 6. The first OP-AMP 50 adjusts The first and second current limit values 30 | and 31. These are not as constant, as the input of the first OP-AMP 50 is connected to the arrangement of capacitor 58, resistor 56, 57 and the inverting output of the flip-flop device 46, so that the first current limit value 30 | depend mainly on the task cycle.
    A thermal fuse | 55 of the switching operation provides over-temperature protection.
    A second OP-AMP 51 is connected to resistor 41 to provide a signal, corresponding to the present current through the 1 "LED light source, as discussed above.
    In correspondence with the realization of figure 4, the trigger 'of port 53, for example, OP-AMPs, serves to amplify the signals of the flip-flop device 46 to a level suitable for' triggering the port of MOSFETs 54a and 54b.
    The inverter output of the flip-flop device 46 is connected to the first trigger of port 53 and the Q output of the flip-flop device 46 is connected | to a second door 53 driver. According to the present embodiment, the first and second current limit values 30, 31 are variable and dependent on the task cycle of the switching operation, so that the emitted luminous flux is linearly dependent of the input voltage of supply voltage 5, thus allowing dimming capabilities without means of ERRE—— "Â] - NS PRA AO o 32/35 additional control.
    The RC circuit formed by resistor 57 and capacitor 58, filters any frequency component of the task cycle of MOSFETS 54a and 54b, so that the average value is used to define the first and second current limits 30, 31. When the LED circuit layout temperature 1 '' reaches an upper limit, thermal fuse 55 sets the task cycle signal to a low value, so that the average inductive current TI, is' low to drive LEDs 48 with a low energy level -— 10 or zero.
    The duty cycle of switches 54a and 54b is defined as s = Fuigh where Vsuppiy is the voltage applied to terminals 7 of the LED light source 3 '' '!'! ' e Vfniga It is all the direct voltage of the LED light source 3 '' “" 'in high voltage mode 33. The time Tu É The charging time of the reactive element 6, the time Ts; describes the switching periods, ex = DPs1,: Fou where Vfiww Is all the direct voltage of the LED light source 3 '' '' '' in low voltage mode 32. For the The particular case of the above performance, follows 22 (1-2) Vfugh A switching frequency can be expressed as ER —— Ô oo py = Leer Yi da, L Aa where hi is the amplitude of the current fluctuation of the reactive element 6. In the case of K = 2, and assuming that the direct LED voltages do not the steady state operation varies, the total average power taken to the LEDs 48 can be calculated 'Prep - [E) Vínigh Tao' where Tso is the average inductive current of the reactive element 6, which according to the realization described above, is independent Vsuppiy E equals To = Luma +, where TIumin is the minimum value of the inductive current waveform in the steady state. From the expressions above, it can be seen that the average power taken to LEDs 48 varies linearly with Vsupply- The maximum power extension corresponds to 0.5 Pnax- The maximum power delivery Pra, is reached as Vsuppiy SE approaches. of Vínigm. Certainly, the minimum power Prnin is obtained as Vsuppiy SE approaches Vfiow. According to figure 5, the voltage source - 20 defines current fluctuation 41, where OP-AMP 50 defines Inimin. The latter is no longer constant, as the OP-AMP 50 entry corresponds to 1 - D . Thus, OP-AMP 50 produces a signal emitted so that Trimin (DT imino FIA, where Ininino € M, are defined by the settings of the voltage source 52. The average current emitted in the present configuration is then
    RR | two '
    Poe (tuts E (1-8) Viuga | The invention has been illustrated and described in detail in the drawings and in the description below.
    Such illustration and description should be considered illustrative and exemplary and not restrictive; the invention is not limited to the disclosed embodiments.
    For example, it may be possible to operate the invention 'according to an embodiment in which: - LED units 8, 9 comprise a higher or lower number of light-emitting diodes 48, connected in series or in parallel or one combination of these, - LED units 8, 9 comprise OLEDs or laser diodes as light emitting elements, - reactive element 6 is integrated with the LED light source module 3, 3 ', 3º, 3' / ' ! ' 3 '*%, 3, - in the circuit layout 1, 1', 1 '' several LED light sources 3, 3 ', 3 ", 3'º“', 3 3 are connected in series to the reactive element 6 , - supply voltage 5 is integrated with the LED supply circuit 2, 2 320 - terminals 7a and 7b, instead of being provided as wire islands or solder islands, they are provided as connection pins, for example , one or more lamp covers, and / or - the control unit 12, 12 ', 12' * 'can be configured with a mode switch, which is arranged to define the control unit 12, 12', 12 ' 'in a defined control setting.
    This can be done through the normal terminals 7, for example, by means of activating, for example, increasing, the signal provided in a special mode.
    Then, the switching means 10 are activated or deactivated and the LED light source 3, 3 ', 3' ', 3' //, 3%, 3 can be operated in both low voltage and voltage mode high. Depending on the mode switch on the LED light source 3, 3 ', 3', 3 '!', 3 '' '', 3, this setting may be non-volatile (permanently stored in the LED light source) , volatile (valid as long as the supply voltage is present at terminals 7, but lost after switching off) or dynamic (valid only for a limited period of time after the command, so that the setting must be updated from time to time) time in the desired control mode, otherwise the LED light source 3, .10 31, 30%, 3'141, 3/14, 3 enters normal internal control mode, as mentioned above).
    In the claims, the word '** comprising' 'does not exclude other elements or steps, and the indefinite article vium' 'or' 'one' * does not exclude a plurality. The mere fact that certain measurements are recited in the mutually recited dependent claims or achievements does not indicate that a combination of these measurements cannot be used to advantage. Any reference signs in the claims should not be construed as limiting the scope of this. | - -- - - O
    权利要求:
    Claims (13)
    [1]
    1. LED CIRCUIT ARRANGEMENT, with at least: - a DC voltage input (4), adapted to provide an operating voltage, - a reactive element (6), connected in series with the aforementioned DC voltage input (4) , - an LED light source (3) characterized by: understanding, - a first is a second LED unit (8, 9), - 10 each having at least one light emitting diode, in a low voltage mode of the LED light source (3), the first and second LED units (8, 9) being connected parallel to each other, and in a high voltage mode of the LED light source (3), the first and second second LED units | 15 (8, 9) being connected in series to each other - a controllable switching means (10) for switching the LED light source (3) between low voltage mode and high voltage mode - a control unit ( 12), configured - to adjust the mentioned switching means (10 in the said low voltage mode when an operational current 7, supplied to the said LED light source (3), corresponds to a first limit value (30), and ' - to adjust said switching means (10) to said high voltage mode when the said current supplied corresponds to a second limit value (31).
    [2]
    2. ARRANGEMENT, according to claim 1, characterized in that the first direct voltage of the said LED light source (3) is less than the said operational voltage and the second direct voltage of the said LED light source (3) ) is higher than the aforementioned operating voltage.
    [3]
    Arrangement according to any one of claims 1 to 2, characterized in that the LED units
    NESSE |
    Er 2/3 (8, 9) are connected with said reactive element (6) both in said low voltage and high voltage mode.
    [4]
    Arrangement according to any one of claims 1 to 3, characterized in that the direct voltage of said first LED unit (8) substantially corresponds to the direct voltage of said second LED unit (9).
    [5]
    Arrangement according to any one of claims 1 to 4, characterized in that said switching means - 10 (10) are controlled by said control unit (12) with a switching frequency of 400 Hz to 40 MHz.
    [6]
    6. LED CIRCUIT ARRANGEMENT according to any one of claims 1 to 5, characterized in that said control unit (12) comprises current detection circuit (13) to determine the current through the LED light source (3).
    [7]
    7. ARRANGEMENT, according to claim 7, characterized in that the control unit (12) is configured to adapt the first and / or the second limit values (30, 31) so that the current through the light source of LED (3) corresponds to a preset average lamp current.
    [8]
    Arrangement according to any one of claims 1 to 7, characterized in that said LED units (8, 9), said switching means (10) and / or said control unit (12) are formed integrally among themselves.
    [9]
    Arrangement according to any one of claims 1 to 8, characterized in that the said recreational element (6) is integrally formed with the said LED light source (3).
    [10]
    10. PROVISION, according to any one of claims 1 to 9, characterized in that said source of
    ME |
    - 3/3: LED light (3) is a two-pole device.
    [11]
    11. ARRANGEMENT according to any one of claims 1 to 10, characterized in that it comprises more than one LED light source (3), connected in series with the aforementioned voltage input (4).
    [12]
    12. LED LIGHT SOURCE FOR OPERATION IN AN LED CIRCUIT ARRANGEMENT (1), as defined in. any of claims 1 to 11
    [13]
    13. METHOD FOR OPERATING A LED LIGHT SOURCE (3). 10 CONNECTED BY A REACTIVE ELEMENT WITH A DC OPERATING VOLTAGE, the aforementioned LED light source (3) characterized by comprising a first and a second LED unit (8, 9), each having at least one light emitting diode, in a low voltage mode of the LED light source (3) the aforementioned first and second LED units (8, 9) being connected together, and in a high voltage mode of the LED light source (3), the aforementioned first and second LED units (8, 9) being connected in series with each other, controllable switching means (10) for switching the LED light source (3) between low voltage mode and high voltage mode , in which the aforementioned switching means (10) are set in the aforementioned: low voltage mode when an Operational current, supplied to the said LED light source (3), corresponds to a] first limit value (30), and are set in said high voltage mode when said current supplied corresponds to a second limit value (31). |
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    法律状态:
    2020-10-13| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-11-10| B25D| Requested change of name of applicant approved|Owner name: KONINKLIJKE PHILIPS N.V. (NL) |
    2020-11-24| B25G| Requested change of headquarter approved|Owner name: KONINKLIJKE PHILIPS N.V. (NL) |
    2020-12-08| B25A| Requested transfer of rights approved|Owner name: PHILIPS LIGHTING HOLDING B.V. (NL) |
    2021-01-26| B11B| Dismissal acc. art. 36, par 1 of ipl - no reply within 90 days to fullfil the necessary requirements|
    2021-11-23| B350| Update of information on the portal [chapter 15.35 patent gazette]|
    优先权:
    申请号 | 申请日 | 专利标题
    EP10188037.5|2010-10-19|
    EP10188037|2010-10-19|
    EP10193359|2010-12-01|
    EP10193359.6|2010-12-01|
    PCT/IB2011/054545|WO2012052893A1|2010-10-19|2011-10-13|Led circuit arrangement|
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