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    • 专利摘要:
    apparatus and driver for supplying current to a plurality of light sources. the lighting unit includes at least two channels of light sources, and a driver for the light sources, and a driver for the light sources. the driver includes a dc / dc converter and a control arrangement to control the current supplied to at least one of the two channels in response to a control signal produced by the dc / dc converter. beneficially, a feedback loop controls a switching device in the dc / dc converter to maintain the level of light produced by the light sources at a desired level, regardless of changes in input voltage and load.
    公开号:BR112012003853B1
    申请号:R112012003853-2
    申请日:2010-08-18
    公开日:2020-12-15
    发明作者:Timothy Moss
    申请人:Signify Holding B.V；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    The present invention is generally directed to a lighting unit and a driver for the lighting unit. More particularly, various methods and equipment of the invention disclosed herein refer to a lighting unit having a plurality of LED light sources and a driver for that lighting unit. HISTORIC
    Lighting devices based on semiconductor light sources, such as light emitting diodes (LEDs), offer a viable alternative to astraditional fluorescent, HID and incandescent lamps. The functional advantages and benefits of LEDs include high energy conversion and optical efficiency, durability, lower operating costs and many others. Recent advances in LED technology have provided efficient and robust sources of full-spectrum lighting that allow for a variety of lighting effects in many applications. Some of the sets that make up these sources have one or more lighting units, including one or more LEDs capable of producing different colors, e.g. red, green and blue, as well as a processor to independently control the power of the LEDs to generate a variety of colors and luminous color variation effects. These lighting units can employ two or more groups or “channels” of LEDs that produce lights of different colors, each supplied by its own current to allow the generation and light mixing for the production of a desired light effect, for example, as discussed in detail in U.S. Patent Nos. 6,016,038 and 6,211,626, incorporated herein by reference.
    In some lighting units, the first channel may include a first plurality of white LEDs (eg, four LEDs) in series with each other, and the second channel may include a second plurality of red LEDs (eg, two LEDs) in series with each other. A desired color effect of the lighting unit can be controlled by adjusting the current in both channels. In some lighting units, the channels are connected in series so that a single current stream or channel passes through all the LEDs, with a shunt being provided on the selected LEDs (eg the LEDs of the second channel) to diverge the current of the LEDs selected to produce the desired color effect.
    Unfortunately, this arrangement typically induces a loss of energy and / or a complicated control scheme. For example, if the shunt is a linear shunt, it can result in other unwanted power losses. A switching shunt or pulse width shunt (PWM) can be used, but the known arrangements require a complicated drive scheme.
    Thus, there is a need in the art to provide a lighting unit with multiple LED channels that can be activated efficiently in order to obtain the desired lighting effect. SUMMARY
    The present disclosure addresses a lighting unit and a driver for a lighting unit.
    For example, the present disclosure describes a lighting unit that includes at least two channels of light sources and a driver for the light sources. The driver includes a DC / DC converter and a control arrangement to control the current supplied to at least one of the two channels in response to a control signal produced by the DC / DC converter. Beneficially, a feedback loop controls a switching device in the DC / DC converter to maintain the light level produced by the light sources at a desired level, regardless of changes in the supply voltage and the load.
    In general, in one aspect, equipment includes: a first channel of first light-emitting devices (LEDs) connected in series with each other; a second channel of second LEDs connected in series with each other; and a driver to drive the first and second LED channels. At least one of the second LEDs has a different color or color temperature than at least one of the first LEDs. The driver includes: a flyback converter, a buck converter, a pulse width modulator and a feedback device. The flyback converter is configured to receive a first DC voltage and to emit a second DC voltage. The buck converter is configured to receive the second DC voltage and to generate an output voltage that causes a first current to pass through the first channel of LEDs and a second current to pass through the second channel of LEDs. Pulse width modulator is configured to control a second current that passes through the second LED channel in response to a control signal. The control signal is produced from an inductor coil in a flyback converter and in the buck converter. The feedback device is configured to sample at least a first current and a second current and in response to control a switching operation of the buck converter.
    In some embodiments, the first LED channel is connected in series to the second LED channel. The driver can include a temperature sensor configured to detect the temperature of at least one of the LEDs, and in response to generate a feedback signal to adjust the output voltage of the DC / DC converter. The driver can also include a light sensor configured to detect the light produced by the LEDs, and in response generate a feedback signal to adjust the output voltage of the DC / DC converter.
    In general, in another aspect, an equipment includes a first group of light sources connected in series with each other, a second group of light sources connected in series with each other, and a driver to drive the first and second groups of light sources. At least one of the light sources in the second group has a different color or color temperature than at least one of the light sources in the first group. The driver includes a DC / DC converter and a control device. The DC / DC converter is configured to receive a first DC voltage and to output an output voltage. The output voltage passes the first current through the first group of light sources and a second current through the second group of light sources. The control device is configured to control a second current supplied to the second group of light sources in response to a control signal. The DC / DC converter produces the control signal.
    In some embodiments, the control device includes a pulse width modulator that controls a second current that passes through the second group of light sources by shunting a second current into one or more of the second light sources in response to the control signal. Also, the second light sources may have a different color or color temperature than the first light source.
    In one embodiment, the DC / DC converter includes a flyback converter. The control signal for controlling the current passing through the second group of light sources is produced by a transformer coil in the flyback converter. In another embodiment, the DC / DC converter 5 includes a buck converter. The control signal for controlling the current passing through the second group of light sources is produced by an inductive coil in the buck converter.
    In addition, the driver may include a feedback device 10 configured to sample at least one of the first current and one of the second current and in response to control a switching operation of the DC / DC converter. Additionally or alternatively, the driver can include a sensor to measure the temperature or the light 15 emitted by at least one first and a second light source, and in response generates a feedback signal to adjust the output voltage of the DC / DC converter .
    In general, in yet another aspect of the invention, a driver supplies a current to a plurality of light sources 20. The driver includes: a DC / DC converter and a control device. The DC / DC converter is configured to receive a first DC voltage and to emit an output voltage. The output voltage sends a current through the light sources. A control device is configured to control a current that passes through part of the light sources in response to a control signal. The control signal is produced by the DC / DC converter.
    In many embodiments, the control device 30 includes a pulse width modulator that controls the current that passes through the part of the light sources by shunting the current through one or more of the light sources in response to the control signal. In one embodiment, the DC / DC converter includes a flyback converter. The control signal is produced by a transformer coil in the flyback converter. In another embodiment, the DC / DC converter includes a buck converter. The control signal is produced by an inductor coil in the buck converter.
    The driver may include a feedback device configured to sample the current and in response to control a switching operation of the DC / DC converter.
    As used herein for the purposes of this disclosure, the term "LED" is to be understood to include any electroluminescent diode or other type of junction-based vehicle injection system that is capable of generating radiation in response to an electrical signal. Thus, the term LED includes, among others, several semiconductor structures that emit light in response to currents, light-emitting polymers, organic light-emitting diodes (OLEDs), electroluminescent tapes and the like. In particular, the term LED refers to 20 light-emitting diodes of all types (including semiconductor and organic light-emitting diodes) that can be configured to generate radiation in one or more between the infrared spectrum, ultraviolet spectrum and various parts of the visible spectrum (usually including 25 radiation wavelengths from approximately 400 nanometers to approximately 700 nanometers). Some examples of LEDs include, but are not limited to, various types of infrared LEDs, ultraviolet LEDs, red LEDs, blue LEDs, green LEDs, yellow LEDs, amber LEDs, orange LEDs 30 and white LEDs (discussed below). It should also be appreciated that LEDs can be configured and / or controlled to generate radiation having various bandwidths (eg, full widths at maximum half, or FWHM) for a given spectrum (eg, narrow bandwidth, width broadband), and a variety of dominant wavelengths within a given general color categorization.
    For example, a configuration of an LED configured to generate essentially white light (e.g., a white LED) may include some arrays that emit respectively different electroluminescence spectra that, in combination, mix to form essentially white light. In another embodiment, a white LED light can be associated with a phosphoric material that converts electroluminescence from a first spectrum to a different second spectrum. In one example of this embodiment, the electroluminescence having a relatively short wavelength and narrow spectrum bandwidth "pumps" the phosphoric material, which in turn radiates radiation of a longer wavelength having a somewhat broader spectrum.
    It should be understood that the term LED does not limit the type of physical and / or electrical package of an LED. For example, as discussed above, an LED can refer to a simple light-emitting device having multiple arrays that are configured to respectively emit 25 different radiation spectra (eg, which may or may not be individually controllable). Also, an LED can be associated with a phosphoric material that is considered an integral part of the LED (eg, some types of white LEDs). In general, the term LED can be 30 referring to packaged LEDs, non-packaged LEDs, surface mount LEDs, chip-on-board LEDs, T-pack LEDs, radial pack LEDs, power pack LEDs, including LEDs some type of encapsulation and / or optical element (eg, a diffusing lens), etc.
    The term "light source" is to be understood as referring to any one or more of a variety of radiation sources, including, but not limited to, LED based sources (including one or more LEDs as defined above), incandescent sources (eg filament lamps, halogen lamps), fluorescent sources, phosphorescent sources, high intensity discharge sources (eg sodium vapor, mercury vapor and metal halide lamps), lasers, others types of electroluminescent sources, pyroluminescent sources (eg, flames), velaluminescent sources (eg, sources of gas blankets and carbon arc radiation), photoluminescent sources 15 (eg, sources of gas discharge), cathode luminescent sources using electronic saturation, galvanoluminescent sources, crystalloluminescent sources, cineluminescent sources, thermoluminescent sources, triboluminescent sources, sonoluminescent sources, radioluminescent sources and lumine polymers nascent.
    A given light source can be configured to generate electromagnetic radiation within the visible spectrum, outside the visible spectrum, or a combination of both. Thus, the terms "light" and "radiation" are used interchangeably here. In addition, the light source may include as an integral component one or more filters (eg, colored filters), lenses, or other optical components. Also, it should be understood that 30 light sources can be configured for various applications, including, among others, indication, display, and / or lighting. A "light source" is a light source that is particularly configured to generate radiation with sufficient intensity to effectively illuminate an indoor or outdoor space. In this context, "sufficient intensity" refers to the sufficient radiant power in the visible spectrum generated in space or in the environment (the unit "lumens" is generally used to represent the total light power of a light source in all directions, in terms of of radiant power or "luminous flux") to provide ambient lighting (that is, light that can be perceived indirectly and that can, for example, be reflected from one or more of a variety of intervening surfaces before being perceived in full or in part).
    The term "spectrum" is to be understood as referring to any one or more frequencies (or wavelengths) of radiation produced by one or more light sources. Thus, the term "spectrum" refers to frequencies (or wavelengths) not only in the visible range, but also frequencies (or wavelengths) in the infrared, ultraviolet and other areas of the total electromagnetic spectrum. Also, a given spectrum can have a relatively narrow bandwidth (eg, an FWHM having essentially few frequency or wavelength components) or a relatively wide 'bandwidth (several frequency or wavelength components having several relative powers).
    • It should also be appreciated that a given spectrum may be the result of a mixture of two or more other spectra 30 (eg, mixture of the radiation respectively emitted by multiple light sources).
    For the purposes of this disclosure, the term "color" is used interchangeably with the term "spectrum."
    However, the term "color" is generally used to refer primarily to a radiation property that is perceived by an observer (although this use is not intended to limit the scope of this term). Thus, the terms "different colors" implicitly refer to multiple spectra having different components of wavelengths and / or bandwidths. It should also be appreciated that the term "color" can be used both in connection with white and non-white light. The term "color temperature" is generally used here in connection with white light, although this use is not intended to limit the scope of this term. Color temperature essentially refers to a certain color or shade content (eg, reddish, bluish) of white light. The color temperature of a given radiation sample is conventionally characterized according to the temperature in degrees Kelvin (K) of a blackbody radiator that radiates essentially the same spectrum as the radiation sample in question. The color temperatures of the 20-body black radiator generally fall within a range of approximately 700 degrees K (usually considered to be the first visible to the human eye) to 10,000 degrees K; white light in general is generally perceived at color temperatures above 1500-2000 degrees K. Less than 25 color temperatures generally indicate white light having a more significant red component or a "warmer sense", while higher color temperatures at generally indicate white light having a more significant blue component or a "cooler sense". As an example, fire has a color temperature of approximately 1,800 degrees K, a conventional incandescent lamp has a color temperature of approximately 2848 degrees K, daylight in the morning has a color temperature of approximately 3,000 degrees K, and the cloudy midday sky has a color temperature of approximately 10,000 degrees K. A color image seen under white light having a color temperature of approximately 3,000 degrees K has a relatively reddish hue, whereas the same color image seen under white light having a color temperature of approximately 10,000 degrees K has a relatively bluish tint.
    The term "lighting unit" is used herein to refer to equipment including one or more light sources of the same or different types. A given lighting unit can have only one of a variety of mounting arrangements for the light source (s), arrangements and formats for 15 closings / households and / or electrical and mechanical connection configurations. In addition, a given lighting unit can optionally be associated with (eg, include, be coupled and / or packaged together) various other components (eg, control circuits) 20 relating to the operation of the source (s) light (s). An "LED-based lighting unit" refers to a lighting unit that includes one or more LED-based light sources as discussed above, individually or in combination with other non-LED-based light sources. A "multichannel" lighting unit refers to an LED-based or non-LED-based lighting unit that includes at least two light sources • configured to respectively generate different radiation spectra, where each different source spectrum can be used. called the "channel" of the multichannel lighting unit.
    It should be appreciated that all combinations of the concepts presented and other concepts discussed in greater detail below (provided these concepts are not mutually inconsistent) are seen to be part of the subject of the invention disclosed herein. In particular, all combinations according to the claimed subject 5 that appear at the end of this disclosure are seen to be part of the subject of the invention disclosed herein. It should also be appreciated that the terminology explicitly used in the present, which can also appear in any disclosure incorporated by reference, 10 must be understood with a meaning more consistent with the particular concepts disclosed in the present. BRIEF DESCRIPTION OF THE DRAWINGS
    In the drawings, equal reference characters generally refer to the same parts in all different views. Also, the drawings are not necessarily to scale; instead, general emphasis is placed on illustrating the principles of the invention. FIG. 1 illustrates a functional block diagram of a lighting unit, according to several embodiments of the invention. FIG. 2 illustrates a first embodiment of a lighting unit. FIG. 3 illustrates an embodiment of a buck converter. FIG. 4 illustrates a second realization of a lighting unit. FIG. 5 illustrates a third embodiment of a lighting unit. DETAILED DESCRIPTION
    Applicants recognized and appreciated that it would be beneficial to allow for the independent and efficient adjustment of the current in one channel of a two-channel LED driver, keeping the current in the mismatched channel constant. In view of the foregoing, various embodiments and configurations of the present invention are directed to provide a DC / DC converter with a control arrangement to control the current supplied to at least one of the two channels in response to a control signal produced by the DC / converter CC.
    FIG. 1 illustrates a functional block diagram of a lighting unit 100. The lighting unit 100 includes a driver 110 and a first to the umpteenth channels of light sources 120-1 to 120-N, for example, for light-emitting diodes (LEDs) ). In an exemplary arrangement, the light sources in the first to nth channels of light sources 120-1 to 120-N are light-emitting diodes (LEDs).
    Also, at least one of the light sources in each channel has a different color or color temperature than at least one of the light sources in each alternating channel. In some embodiments, all light sources in each channel have different colors or color temperatures than all light sources in each alternating channel. In an exemplary embodiment, there can be two channels and the first channel can include "white" light sources (eg LEDs) and the second channel can include "white" non-white light sources (eg LEDs) ., red). Many of these example achievements are possible. In one embodiment, N = 2 and the first and second light source channels 120-1 and 120-2 are connected in series with each other.
    Driver 110 includes an AC / DC converter 130, a DC / DC converter 140, current control device 160, a sensor 170, a current monitor 180, and a feedback controller 190. In some embodiments, the driver can be supplied with continuous power (for example, from an external AC / DC converter), in which case the AC / DC converter 130 can be omitted. In some particular embodiments, sensor 170 can be omitted.
    In the realizations in which it is present, the AC / DC converter 130 converts an AC voltage such as 120 VAC into a DC voltage and can include an input filter and a voltage rectifier.
    The DC / DC converter 140 converts a DC voltage (eg output via AC / DC converter 130) to a desired voltage level 10 for the activation of the first to the nth channels of light sources 120-1 to 120-N . Beneficially, the DC / DC converter can include two stages comprising: a flyback converter as a first stage or initial stage, which converts a first DC voltage into a second DC; and a "Buck" converter as a second stage or final step that converts the second DC voltage to an output DC voltage.
    The present control device 160 supplies and controls the output current of the DC / DC converter 140 for the first 20 to the nth channels of light sources 120-1 to 120-N. In particular, the present control device 160 receives a signal from current control 175 obtained from the DC / DC converter 140 and in response it controls the current of one or more of the first to the nth channels of light sources 25 120-1 to 120-N. In an advantageous arrangement, the current control device includes a pulse width modulator (PWM) switch in the selection of the light sources as necessary to obtain a desired lighting effect for the lighting unit 100.
    In the realizations in which it is present, sensor 170 senses the heat or light generated by the first to the nth channels of light sources 120-1 to 120-N and provides a feedback signal 185 to feedback controller 190 to adjust the output of DC voltage by the DC / DC converter 140 and maintain a desired lighting effect of the lighting unit 100 as age components, changes in environmental conditions, etc.
    Current monitor 180 monitors or samples current from the first to the nth channels of light sources 120-1 to 120-N and provides a current sample signal 195 to feedback controller 190.
    The feedback controller 190 receives the current sample signal from the current monitor 18 0 and in response provides one or more control signals from the DC / DC converter 140 for adjusting the output voltage of the DC / DC converter 140. beneficial, the feedback loop with the current of the feedback controller 190, maintains the current from the first to the nth channels of light sources 120-1 to 120-N, and thus the light level of the lighting unit 100, constant with any change in input voltage or load.
    In the lighting unit 100, there are some variables for obtaining a desired lighting effect: the choice of the light source, (that is, the number and color temperatures of the light sources in the first to the nth channels of light sources 120-1 at 120-N); the selection and number of light sources controlled by the current control device 160; internal and output voltages of the DC / DC converter 14 0; and the mechanism for producing the control signal 175 in the DC / DC converter 140, all provide means that can be adjusted or determined to provide the necessary drive current from the first to the nth channels of light sources 120-1 to 120-N. Once determined and projected, then the lighting effect obtained by the lighting unit 100 can be changed or fine-tuned by changing or adjusting an internal voltage and / or output voltage of the DC / DC converter 140. A (s) voltage (voltages) can be set at the factory depending on the use of a particular lot or set of light sources (eg LEDs), or can be adjusted via a 17 0 sensor feedback loop to maintain the desired lighting with variations in environmental and aging conditions, or can be adjusted by the user.
    Another explanation of the lighting unit 100 will now be made with reference to the specific exemplary embodiments.
    FIG. 2 illustrates a first embodiment of a lighting unit 200. The lighting unit 200 includes a driver 210 and a first and second light source channels 120-1 and 120-2.
    In the lighting unit 200, the first and second light source channels 120-1 and 120-2 are connected in series with each other. As discussed above with reference to FIG. 1, in one embodiment the light sources are LEDs. Also beneficially, at least one of the light sources in each channel has a different color or color temperature than at least one of the light sources in alternating channels. In some embodiments, all light sources in each channel have a different color or color temperature than all other light sources in each alternating channel. In carrying out the example, the light sources in the first channel 120-1 are "white" light sources (eg, white LEDs) and the light sources in the second channel 120-2 are light sources (eg, red LEDs) not "colored" white (eg, red LEDs). Many of these exemplary achievements are possible.
    Driver 210 includes an AC / DC converter 230, a flyback converter 240, a flyback drive unit 24 4, a flyback control unit 246, a flyback feedback unit 248, a convertorbuck 245, a pulse width modulator (PWM) switch 260, a current sampling resistor 280, and a control unit and buck 290 converter feedback drive.
    The AC / DC converter 230 receives an input AC voltage from the AC input 205 and converts the AC voltage to a first DC voltage. The AC / DC converter 230 can include an input filter and a rectifier.
    The flyback converter 240 includes a flyback transformer 242, a switching device, a diode and a capacitor. The flyback converter 240 comprises a first stage or initial step of the driver's DC / DC converter 210. The flyback converter 240 receives a first DC voltage from the AC / DC converter 230 and sends a second DC voltage that can be adjusted by the appropriate rate selection windings in the flyback transformer 242 and in the control and feedback operations of the flyback drive unit 244, the flyback control unit 246 and the flyback feedback unit 248. In some embodiments, the flyback converter 240 can provide the correction of the active power for the input line current, that is, the load seen through the AC 205 input. In some embodiments, the flyback converter 240 can also provide safety isolation between the AC 205 input and the user or light sources on channels 120 -1 and 120-2. Otherwise, the configuration and operation of the flyback converters are well known and will not be repeated here.
    The buck 245 converter comprises a second stage or final step of the driver's DC / DC converter 210. The buck 245 converter receives a second DC voltage from the flyback converter 240 and produces an output voltage that passes a current through the first and second channels 120-1 and 120-2 light sources.
    FIG. 3 is a function diagram of an embodiment of a buck converter 300 that can be employed in the lighting unit 200. The buck converter 300 includes a switching device 310 (eg, a transistor as a switching field effect transistor) (FET)), a diode 320, an inductor 330, and optionally a second inductor 520 which is inductively coupled to inductor 330. The operating cycle of the switching device 310 is controlled by a control signal from the buck 255 converter which is produced by the buck 290 converter control and feedback drive, as will be explained in more detail below. An explanation of optional second inductor 520 with reference to FIG. 5. Otherwise, the configuration and operation of the buck converters are well known and will not be repeated here.
    The current sampling resistor 280 samples the total current through the first light source channel 120-1 and sends a current sampling signal to the buck 290 converter control and feedback drive. In response to a sampling signal current control, the buck 290 converter control and feedback drive generates a control signal from the buck 255 converter, which, for example, controls the operating cycle of the switching device 310 on the buck 245 converter. This, in turn, controls the current through the first channel of light sources 120-1. For example, the feedback drive and control unit 290 may include an operational amplifier or comparator that compares a current sampling signal to a desired value and in response adjusts the control signal from the buck 255 converter. In some embodiments, the resistor Current sampling can be connected "on the high side" between the output voltage of the buck 245 converter and the light sources 5, instead of being between the light sources and the return voltage (eg ground). In some embodiments, other current sampling arrangements may be provided instead of the series current sampling resistor 280.
    Nominally, the 245 regulator operating cycle will establish the ratio of the output voltage divided by the second DC voltage. In a beneficial arrangement, the control loop including sampling resistor 280, the control unit and feedback drive of the buck 290 converter and the buck 245 converter keep the general current constant, despite the first channel of light sources 120- 1 with the change in the first DC voltage or load. Beneficially, this arrangement can provide a current regulated by the light sources in a relatively wide range of the first DC voltages.
    In the lighting unit 200, the PWM switch 260 is a bipolar transistor, but in some embodiments, a different switching device may be employed. The PWM switch 260 is connected between the light sources 25 of the second channel of light sources 120-2, in order to periodically make the shunt or bypass that would otherwise pass through the second channel of light sources 120-2 in response to the control signal 275.
    By varying the operating cycle of the PWM 260 switch, the average current passing through the second channel of light sources 120-2 is adjusted. This, in turn, adjusts the average light produced by the second channel of light sources 120-2, which results in an adjustment of the total intensity and color of the light produced by the lighting unit 200. In some embodiments, the PWM switch can be connected on the "high side" of the device in series, on the first channel of light sources 120-1 instead of on the second channel of 5 light sources 120-2. In general, the PWM 260 switch can be connected to any selection of light sources as necessary to achieve the desired lighting effect.
    In a particular arrangement, in the lighting unit 200, the secondary coil of the flyback transformer 10 242 is used to provide a control signal 275 for the control of the PWM switch 260. To obtain the desired lighting effect, some can be adjusted lighting unit variables or parameters 200. The choice of light sources (eg the number and 15 the color temperatures of the "white" light sources (eg LEDs) of the first channel 120-1, and the sources second channel 120-2 having a different color or color temperature); the placement of the PWM 260 switch; the second level of DC voltage; and the winding rate of the flyback transformer 242, all provide means that can be adjusted or determined to provide the control signal for the PWM switch 260. Once determined and designed, then the lighting effect can be changed or undergo regulation fine by changing or adjusting a second DC voltage level. The second level of DC voltage can be set at the factory depending on the use of a specific lot or set of light sources (eg LEDs).
    Although not shown in FIG. 2, the second DC voltage level 30 can be adjusted through a feedback loop with a light and / or thermal sensor (eg sensor 170 in FIG. 1) to maintain the desired lighting effect with varying environmental and aging conditions or can be adjusted by the user. This feedback adjustment can occur on both the primary and secondary (isolated) side of the flyback transformer 242.
    FIG. 4 illustrates a second realization of a lighting unit 400 including driver 410. The lighting unit 400 is identical to the lighting unit 200, except that the PWM switch 260 in the lighting unit 400 is controlled by the control signal 475 which is produced from the primary coil of the flyback transformer 242 242 .
    FIG. 5 illustrates a third realization of a lighting unit 500 including driver 510. The lighting unit 500 is identical to the lighting unit 200, except that the PWM switch 260 in the lighting unit 500 is controlled by the control signal 575 which is produced from a winding of the buck converter 245, for example winding 520 as shown in FIG. 3.
    Although various embodiments of the invention have been described and illustrated herein, those skilled in the art will readily see a variety of other means and / or structures for carrying out the function and / or obtaining results and / or one or more of the advantages described herein, and each of these variations and / or modifications must be within the scope of the embodiments of the invention described herein. More generally, those skilled in the art will readily appreciate that all parameters, dimensions, materials and configurations described herein are exemplary only and that the actual parameters, dimensions, materials and / or configurations will depend on the specific application or applications for which the teachings of the invention are used. Those skilled in the art will recognize, or be able to certify using, no more than routine experimentation, many equivalents to the specific embodiments of the invention described herein. Therefore, it should be understood that the above achievements are presented as examples only and that, within the scope of the appended claims and their equivalents, the achievements of the invention may be exercised, unless specifically described and claimed. The realizations of the invention of the present disclosure are directed to each characteristic, system, article, material, kit and / or individual method described herein. In addition, any combination of two of these characteristics, systems, articles, materials, kits and / or methods, if these characteristics, systems, articles, materials, kits and / or methods are not mutually inconsistent, will be included in the scope of the invention. present revelation.
    All definitions, as defined and used herein, must be understood to control, according to the dictionary definitions, the definitions in 20 documents incorporated by reference and / or the ordinary meanings of the defined terms.
    The indefinite articles "one" and "one," as used herein in the specification and in the claims, unless clearly indicated to the contrary, are to be understood as meaning "at least one."
    The phrase "and / or" as used herein in the specification and in the claims, should be understood to mean "one or both" of the elements together, that is, elements that are present together in some cases and dispersedly in other cases .
    Multiple elements listed as "and / or" must be understood in the same way, that is, "one or more" of the elements thus together. Other elements may optionally be present, in addition to the elements specifically identified by the "and / or" clause, are related or unrelated to those elements specifically identified. Thus, as a non-limiting example, a reference to "A and / or B", when used in conjunction with an open-sided language such as "comprising" may refer, in one embodiment, to only A (optionally including elements other than B ); in another embodiment, only B (optionally including elements other than A); in yet another embodiment, both A and B (optionally including other elements); etc.
    As used herein in the specification and in the claims, "or" is to be understood to have the same meaning as "and / or" as defined above. For example, when separating items in a list, "or" or "and / or" should be interpreted as including, that is, the inclusion of at least one, but also including more than one, of a number or list of elements , and, optionally, other items not listed. Only terms clearly indicated to the contrary, such as "only one of" or "exactly one of," or, when used in the claims, "consisting of," refer to the inclusion of exactly one element of a number or list of elements. In general, the term "or" as used herein will only be interpreted as indicative of exclusive alternatives (ie "one or the other, but not both") when preceded by the terms of exclusivity, such as "each," "one of" "only one of" or "exactly one of". "Consisting essentially of" when used in the claims, it will have its ordinary meaning as used in the field of patent law.
    As used herein in the specification and in the claims, the phrase "at least one," with reference to a list of one or more elements, is to be understood as meaning at least one element selected from any one or more elements in the list of elements, but 5 not necessarily including at least one of each element specifically listed in the list of elements and not excluding any combination of elements in the list of elements. This definition also allows elements to optionally be present in addition to the elements 10 specifically identified in the list of elements to which the phrase "at least one" refers, whether related or unrelated to those specifically identified elements.
    All reference numerals or other 15 characters, which appear in parentheses in the claims, are provided for convenience only and are not intended to limit the claims in any way.
    It should also be understood that, unless clearly stated otherwise, in any of the methods claimed herein that include more than one step or act, the order of the steps or acts of the method is not necessarily limited to the order in which the steps or acts of the method are mentioned.
    In the claims, as well as in the above specification, all transition phrases such as "comprising", "including", "carrying", "having", "containing", "involving", "retaining", "composed of" and others must be understood to have open ends, that is, 30 meaning including, among others. Only the transition phrases "consisting of" and "consisting essentially of" should be closed or semi-closed transition phrases, respectively.
    权利要求:
    Claims (6)
    [0001]
    1.DRIVER (110, 210, 410, 510) FOR THE SUPPLY OF CURRENT TO A PLURALITY OF LIGHT SOURCES (120-1, 120-2), the driver including: a DC / DC converter (140) configured to receive a first DC voltage and to emit an output voltage, the output voltage by passing a current through the light sources; and a control device (160, 260) configured to control the current passing through part of the light sources in response to a control signal (175, 275, 475, 575), in which the control device (160, 260 ) comprises a pulse width modulator (260) that controls the current flowing through the part of the light sources by shunting the current through one or more of the light sources in response to the control signal, characterized by -the DC / DC converter include a flyback converter (240), and the control signal (175, 275, 475) is produced by a coil of a transformer (242) in the flyback converter or - the DC / DC converter (140) includes a buck converter (245 , 300), and where the control signal (175, 575) is produced by an inductor coil (520) in the buck converter, and where the control signal (175, 275, 475, 575) for current control that passes through the part of the light sources is produced by the DC / DC converter.
    [0002]
    2.DRIVER (110, 210, 410, 510) according to claim 1, characterized by the inductive coil from which the control signal (175, 475) is generated to be a primary coil of a transformer (242) in the flyback converter (240).
    [0003]
    3.DRIVER (110, 210, 410, 510), according to claim 1, characterized by the induction coil from which the control signal (175, 275) is generated to be a secondary coil of a transformer (242) in the flyback converter (240).
    [0004]
    4. DRIVER (110, 210, 410, 510), according to claim 1, characterized in that it further comprises a feedback device (290) configured to sample the current and in response to control a switching operation of the DC / DC converter.
    [0005]
    5.DRIVER (110, 210, 410, 510) according to claim 1, characterized in that it further comprises a temperature sensor (170) configured to detect a temperature of at least one of the plurality of light sources, and in response to generate a feedback signal (185) for adjusting the output voltage of the buck converter.
    [0006]
    6.DRIVER (110, 210, 410, 510), according to claim 1, characterized in that it further comprises a light sensor (170) configured to detect the light produced by the plurality of light sources, and in response, to generate a signal feedback (185) for adjusting the buck converter output voltage.
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    同族专利:
    公开号 | 公开日
    US20140103813A1|2014-04-17|
    US9345079B2|2016-05-17|
    CN102484916A|2012-05-30|
    CN102484916B|2014-12-31|
    JP5508532B2|2014-06-04|
    TW201112862A|2011-04-01|
    WO2011024102A1|2011-03-03|
    JP2013503427A|2013-01-31|
    MX2012002255A|2012-03-16|
    EP2471344A1|2012-07-04|
    CA2771848C|2018-01-09|
    TWI538553B|2016-06-11|
    RU2012111272A|2013-10-10|
    KR101928769B1|2018-12-13|
    KR20120064084A|2012-06-18|
    CA2771848A1|2011-03-03|
    US20120153834A1|2012-06-21|
    RU2556015C2|2015-07-10|
    EP2471344B1|2013-08-07|
    US8624513B2|2014-01-07|
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    法律状态:
    2017-09-19| B25D| Requested change of name of applicant approved|Owner name: KONINKLIJKE PHILIPS N.V. (NL) |
    2017-10-03| B25G| Requested change of headquarter approved|Owner name: KONINKLIJKE PHILIPS N.V. (NL) |
    2017-10-17| B25A| Requested transfer of rights approved|Owner name: PHILIPS LIGHTING HOLDING B.V (NL) |
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-03-19| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|
    2019-10-01| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2020-03-24| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2020-08-04| B25D| Requested change of name of applicant approved|Owner name: SIGNIFY HOLDING B.V. (NL) |
    2020-08-18| B25G| Requested change of headquarter approved|Owner name: SIGNIFY HOLDING B.V. (NL) |
    2020-09-01| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-12-15| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 15/12/2020, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US23656909P| true| 2009-08-25|2009-08-25|
    US61/236,569|2009-08-25|
    PCT/IB2010/053734|WO2011024102A1|2009-08-25|2010-08-18|Multichannel lighting unit and driver for supplying current to light sources in multichannel lighting unit|
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