• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    It is proposed an LED converter for supplying an at least one LED having LED track with power, comprising: a resonant converter (6) with a at least one switch (LS, HS) having switching regulator, a galvanic barrier (7) whose primary side ( Lm) is supplied by the switching regulator and whose secondary side (Lt) is arranged so that it directly or indirectly supplies current to the LED track, a primary side arranged control unit (9) for detecting a primary-side electrical characteristic, wherein for generating a desired LED Electricity, ie a desired current through the LED path, the control unit (9) controls the detected primary-side electrical characteristic to a desired value by controlling the switching regulator, wherein the target value for the detected primary-side electrical characteristic is dependent on the detected LED voltage, wherein the LED voltage is detected on the primary side of the control unit (9).
    公开号:AT15653U1
    申请号:TGM9011/2014U
    申请日:2014-04-26
    公开日:2018-04-15
    发明作者:Lecker Simon；Bell Wayne；Dalby Paul；Makwana Deepak
    申请人:Tridonic Gmbh & Co Kg；
    IPC主号:
    专利说明:

    description
    CONSTANT CURRENT CONVERTER FOR LIGHTING DEVICES The present invention relates in particular to a converter for operating at least one lamp, preferably at least one LED.
    LED converter for operating LEDs having a resonance converter, such as an LLC converter are generally known from the prior art. In particular, an LED converter can be supplied by an electrical supply source which supplies the LED converter with direct current or rectified alternating current.
    The resonance converter then transmits current via a galvanic barrier or galvanic barrier from a primary side to a secondary side of the galvanic barrier to supply an LED path with current.
    It is known to operate such a resonance converter or LLC converter as a constant current converter. For this purpose, a control loop for regulating its output current or the LED current can be provided. For example, the LED current can be measured on the secondary side of the galvanic lock. This measurement is fed back to a primary-side control circuit via an optocoupler in order to control the LED converter accordingly.
    There is, however, an effort that a predetermined target value for the LED current can be guaranteed purely by measuring a primary-side current of the LED converter. In order to avoid a measurement of the LED current on the secondary side, a current of the resonance converter can then be measured on the primary side in order to clock or control the resonance converter accordingly. With this control, a setpoint for the primary-side current is stored for each setpoint to be set for the current through the LED path.
    However, this approach does not take into account that there is no strict connection between the primary-side current and the LED current, but rather that this connection has another influencing variable, namely the LED voltage. Changes in the LED voltage can result, for example due to strong temperature changes, but also through a change in the LED path and in particular through a change in the number and / or type of the connected LEDs.
    The invention is based on the technical problem of specifying a circuit or an LED converter for operating an LED section and a corresponding operating method in which the regulation on the primary side can be improved.
    [0008] This problem is now solved by the combination of the features of the independent claims. The dependent claims advantageously develop the central idea of the invention.
    The basic idea of the invention is to modify the target value for the primary-side current depending on the measured LED voltage. In order to know the nature of this modification, a test measurement is carried out to establish this relationship between primary-side current and LED voltage - i.e. to find out the dependency of the primary-side current on the LED voltage to achieve a constant LED current.
    According to a first aspect of the invention, there is provided an LED converter for supplying power to an LED line comprising at least one LED. The LED converter has [0011] - a resonance converter with a switching regulator having at least one switch, [0012] - a galvanic lock, the primary side of which is supplied by the switching regulator and the secondary side of which is arranged such that it is directly connected to the LED path indirectly supplies electricity, / 14
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    Patentamt [0013] - a control unit arranged on the primary side for detecting a primary-side electrical parameter.
    To generate a desired LED current, i.e. of a desired current through the LED path, the control unit regulates the detected primary characteristic electrical variable to a target value by controlling the switching regulator. The target value for the detected primary electrical parameter depends on the detected LED voltage.
    To regulate the current supplied to the LED path, the control unit controls the switching regulator depending on the primary electrical characteristic detected. A target value for the detected primary electrical parameter is modified depending on the detected LED voltage.
    Preferably, for a desired LED current, the corresponding target value for the primary-side electrical parameter can be stored.
    Preferably, the dependency of the primary-side electrical parameter on the LED voltage can be stored to achieve a constant, desired LED current.
    Preferably, the dependency of the primary-side electrical parameter on the LED voltage can be stored in a look-up table or look-up table, which is preferably provided on the primary side, or can be stored according to a function.
    [0019] The setpoint value for the detected primary electrical characteristic can preferably also be dependent on at least one further variable, such as the temperature.
    [0020] This additional dependency can preferably also be stored in the look-up table or be stored according to the function.
    [0021] For different adjustable LED current values, the corresponding profile or curve profile of the primary-side electrical characteristic variable can preferably be stored as a function of the LED voltage.
    [0022] Preferably, for a number of adjustable LED current values, a single profile of the primary-side electrical parameter can be stored as a function of the LED voltage. For each of these multiple adjustable LED current values, displacement values can be stored that are used to derive a compensation value for the primary-side electrical parameter.
    According to a further aspect of the invention, there is provided an LED converter for supplying current to an LED path comprising at least one LED, comprising: [0024] - a resonance converter with a switching regulator having at least one switch, [0025] - a galvanic one Barrier, the primary side of which is supplied by the switching regulator and the secondary side of which is arranged in such a way that it supplies current to the LED line directly or indirectly, a control unit arranged on the primary side for detecting an electrical characteristic on the primary side.
    To generate a desired LED current, i.e. of a desired current through the LED path, the control unit regulates the detected primary characteristic electrical variable to a target value by controlling the switching regulator. The target value for the detected primary electrical parameter depends on the detected temperature.
    The above-mentioned secondary aspects regarding the LED voltage can also be used here in connection with the temperature.
    Preferably, the primary-side electrical parameter can be a primary-side current,
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    Patent office, in particular, the current through the primary side of the galvanic lock.
    [0030] The LED voltage can preferably be measured on the secondary side and transmitted to the primary side, in particular to the control unit, via the galvanic lock.
    Preferably, the transmission of the LED voltage measured on the secondary side to the primary side can take place via an optocoupler.
    Preferably, a circuit on the secondary side, in particular in the form of an integrated circuit such as e.g. ASIC or microcontroller for performing the measurement of the LED voltage and for controlling the optocoupler.
    Preferably, the transmission of the LED voltage measured on the secondary side to the primary side can take place according to a digital protocol via an optocoupler.
    Preferably, the LED voltage on the primary side can be detected indirectly by the control unit, in particular by measuring at least one further electrical parameter.
    The LED voltage can preferably be detected indirectly by the control unit by measuring a voltage on the primary side, in particular by measuring the voltage applied to the primary side of the galvanic lock.
    [0036] According to a further aspect of the invention, a method is provided for supplying current to an LED section having at least one LED, starting from an LED converter:
    A resonance converter with a switching regulator having at least one switch, a galvanic lock, the primary side of which is supplied by the switching regulator and the secondary side of which is arranged in such a way that it directly or indirectly supplies current to the LED path, [0039] ] A primary electrical parameter is recorded. To generate a desired LED current, i.e. of a desired current through the LED path, the detected primary electrical characteristic is regulated to a target value by controlling the switching regulator. The target value for the recorded primary electrical parameter depends on the recorded LED voltage.
    [0040] All the above-mentioned aspects or secondary aspects relating to the LED converter can also be used here in connection with a method according to the invention.
    According to a further aspect of the invention there is provided a computer software program product which implements such a method when it runs in a computing device.
    According to a further aspect of the invention, there is provided an integrated circuit, in particular ASIC or microcontroller or a hybrid version thereof, which is designed to implement such a method according to claim 17.
    According to a further aspect of the invention, there is provided a lamp having an LED section and an LED converter described above for supplying the LED section with current.
    The invention is also described below with reference to the figures.
    1 schematically shows the structure of a circuit according to the invention for supplying an LED path, [0046] FIG. 2 shows an exemplary embodiment of an LED converter for supplying an LED path according to the invention,
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    Patent Office [0047] Fig. 3 [0048] Fig. 4 [0050] Fig. 7 [0051] Fig. 8 shows an alternative embodiment of an LED converter according to the invention for supplying an LED path, shows the course of different electrical variables of the LED converter, shows the course of a calculated value according to the invention as a function of the LED voltage, shows exemplary compensation values according to the present invention, and shows a further exemplary embodiment of an LED converter according to the invention for supplying an LED path.
    1 shows in schematic form the structure of a circuit 1 for operating a load 2. In particular, the structure of an LED converter for operating an LED path is shown having one or more LEDs. The LEDs of the LED section can be arranged in series, in parallel or according to a series / parallel connection.
    The circuit is preferably driven by an input voltage Vin e.g. fed in the form of an alternating voltage or mains voltage. On the input side, the input voltage is preferably fed to a rectifier 3 and an EMI filter 4 (electromagnetic interference) for filtering electromagnetic interference. Alternatively, the input voltage can also be a DC voltage or a constant voltage, e.g. be a battery voltage, in which case the rectifier 3 and the EMI filter 4 are not necessary.
    The preferably filtered voltage is then fed to a power factor correction circuit (PFC) 5, which supplies a resonance converter 6, for example a series resonance converter, in particular an LLC converter.
    On the output side is the resonance converter 6 with a galvanic lock 7, e.g. a SELV lock (safety extra-low voltage lock). This galvanic lock 7 is e.g. in the form of a transformer connected to or part of the resonance converter. Via this galvanic lock 7 or via the transformer, current is transmitted from a primary side of the galvanic lock to a secondary side of the galvanic lock. This transmission serves to supply the load 2 with current in the form of a light source, in particular in the form of an LED section.
    An electrical characteristic such as e.g. a current is detected by a control unit 9. In particular, it is a current of the resonance converter 6 or a current through the primary side of the galvanic lock 7. stored for the primary-side current: for each target value to be set for the current through the LED path, a target value for the measured primary-side electrical parameter is stored in the primary-side control unit 9. By controlling the resonance converter 6, the electrical parameter is then regulated to the target value. The resonance converter 6 is preferably designed as a constant current converter.
    According to the invention, the target value for the primary-side electrical parameter depends on the detected LED voltage and / or on other variables such as e.g. the temperature of the LED track.
    According to one embodiment of the invention, the voltage Vled applied to the LED path is measured on the secondary side by a control unit 8 arranged on the secondary side. The control unit 8 measures or detects this voltage Vled and couples the voltage Vled or a variable representing the measured voltage back to the primary-side control unit 9 via an optocoupler (not shown). This feedback is shown in FIG. 1 under reference number 10. The data transmission via the feedback 10 can take place digitally, i.e. In this case, the optocoupler is controlled according to a digital protocol by the control unit 8 on the secondary side.
    Alternatively, the LED voltage Vled can also be detected indirectly. Preferably
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    The patent office then detects this LED voltage Vled on the primary side, so that the information relating to the LED voltage Vled cannot be fed back through the galvanic lock 7. Preferably, a primary-side voltage is used for the indirect determination of the voltage applied to the LED section, e.g. a voltage from the resonance converter 6 or the voltage applied to the primary side of the galvanic lock 7.
    In order to control the primary electrical parameter depending on the temperature, information regarding the temperature of the LEDs or the LED path is necessary. This information can be determined on the secondary side by the secondary-side control unit 8 and can be fed back via the optocoupler of the primary-side control unit 9. Alternatively, this temperature can be recorded on the primary side and forwarded to the primary-side control unit 9, so that feedback via the galvanic lock is not necessary.
    Fig. 2 shows an embodiment of an LED converter for supplying an LED track. In this exemplary embodiment, only the measurement of the electrical characteristic on the primary side is shown, but not the direct or indirect measurement of the LED voltage already shown in FIG. 1.
    The LED converter comprises a switching regulator, e.g. a half-bridge converter having a lower-potential switch LS and a higher-potential switch HS. The half-bridge converter is supplied by a voltage VDC, which e.g. the output voltage of the PFC circuit 5 shown in FIG. 1 or alternatively can be a battery voltage. The switches of the half bridge can be used as transistors, e.g. FET or MOSFET.
    At the center of the half bridge, i.e. a resonance converter 6 in the form of an LLC converter is connected between the two switches LS, HS. The LLC converter comprises a series connection of a capacitance Cr, an inductance Lr and the primary-side inductance Lm of the galvanic lock 7 or the transformer. The capacitance Cr and the inductance Lr form an LC resonance circuit.
    On the secondary side, the secondary-side inductance Lt of the transformer is provided, which is coupled to the primary-side inductance Lm and which is connected to diodes D1 and D2. The LED section is connected to the cathodes of the diodes D1, D2. A capacitor C2 is preferably provided parallel to the LED path.
    A measuring resistor Rsnsl is connected in series with the primary-side inductance Lm of the transformer. The primary-side control unit 9 is thus able to detect a primary-side electrical parameter in the form of the current through the LLC converter or through the inductance Lm of the transformer. The primary-side control unit 9 then controls the switches HS, LS of the resonance converter, in particular the switching frequency of these switches HS, LS, on the basis of the measured current through the LLC converter.
    The embodiment of FIG. 3 basically corresponds to the embodiment of FIG. 2. Only the measuring resistor Rsnsl is replaced by a low-pass circuit. On the primary side, a series circuit comprising a diode D3 and a measuring resistor Rsns2 is connected in series with the primary-side inductance Lm, the anode of the diode D3 being connected to the inductance Lm. A diode D4 is connected in parallel with the series circuit comprising diode D3 and measuring resistor Rsns2, the cathode of diode D4 being connected to the inductor Lm on the primary side.
    A center point between diode D3 and measuring resistor Rsns2 is connected to a low-pass filter having a filter resistor Rlp and a filter capacitance Clp. To generate a desired LED current, a target value for the mean value of the one-way rectified current is regulated by the primary-side inductance Lm.
    4 shows the course of different electrical quantities of the LED converter. In the following, the primary-side electrical characteristic is the primary-side current, i.e. the current through the primary-side inductance Lm is taken into account.
    For example, the bottom curve shows the relationship between the primary current
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    Inom and the voltage of the LED track Vled with a constant LED current of 900 mA. The different curves relate to different target values for the current through the LED path from 900 mA to 1750 mA.
    4 therefore shows the value of the primary-side current Inom to be set in order to ensure a desired current through the LED path. It can be seen that there are areas in which a changing LED voltage has no influence on the primary-side current. Such an area essentially corresponds to the horizontal course of the curves. For the LED current lled = 900 mA, this range extends approximately from 30 V to 42 V.
    Meanwhile, there are also areas in which a changing LED voltage Vled requires a modification for the target value Inom for the primary-side current. In particular in the rising areas of the curves shown, a modification of the nominal value Inom for the primary-side current is necessary.
    The invention has thus recognized that, taking into account the LED voltage, the LED current generated can be defined more precisely.
    The invention is implemented by first detecting the respective dependency of the primary-side current on the LED voltage, as shown in FIG. 4, for different currents through the LED path.
    It typically results from this measurement that for all target currents for the primary-side current there is the same curve in the immediate vicinity.
    The following Table 1 shows for different values of the LED voltage Vled the primary-side current Inom, which is required to ensure a constant LED current of 950 mA. These values are also shown in the corresponding curve in FIG. 4.
    Inom (mA) Vled (V) Inom diff (mA) 120 5 5V 0 110 5 OV 6 100 27 V 17
    The following Table 2 shows the required primary-side current Inom to achieve a constant LED current of 1750 mA.
    Inom (mA) Vled (V) Inom diff (mA) 160 34V 0 158 28V 1 157 2 OV 2
    Similar measurements are made for the other values of the LED current.
    To be able to compare the different curves shown in FIG. 4, these curves can be displayed in a common range of values. For this, the curves can e.g. be standardized. According to the invention, it is proposed to calculate a further value Inomdiff for each measured primary-side current Inom as follows:
    Inom diff = Inom / max - Inom, where Inom / max represents the maximum value of the primary-side current Inom. For example, For an LED current of 950 mA, Table 1 gives a maximum value Inom / max = 117 mA. Accordingly, the following equation applies to the third column of Table 1: Inom diff = 117-Inom.
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    Patent Office Fig. 5 now shows the course of this calculated value Inomdiff as a function of the LED voltage Vled. 5 shows how similar the curves are.
    On the one hand, it can be provided to store the respective course of the primary-side current as a function of the LED voltage, for example for different LED currents, e.g. in a look-up table or look-up table or function stored in the primary-side control unit 9. For example, the course of the curves shown in FIG. 4 could be stored.
    On the other hand, the similarity of the curves shown in Figs. 4 and 5 is preferably used in that e.g. due to a software-implemented look-up table on the primary side, only a single curve is stored. The stored curve shape preferably relates to one of the predeterminable LED current values.
    [0084] A possible look-up table could, for example, have a single curve profile for the primary-side current as a function of the LED voltage. The course of the curve is evaluated based on the respective measured curve for the LED current lled = 950 mA and lled = 1750 mA, i.e. based on the curve for the lower adjustable LED current and for the maximum adjustable LED current.
    On the basis of this look-up table, a value InomFactor can be read out for the measured voltage Vled.
    The value of the measured LED voltage Vled is now corrected by the corresponding value Inom Factor, for example multiplied by this value.
    For LED voltage values that are not stored in the look-up table, an interpolation can be carried out in order to calculate the corresponding value inom factor. To avoid such calculations or interpolations, the look-up table can e.g. can be expanded to 255 values for the LED voltage.
    Depending on the LED current that is actually to be set, the curve shape stored in the look-up table is now modified accordingly. For this purpose, displacement values Voffset, Inomoffset for each LED current to be set are preferably stored in a table. This results in the compensation value for the primary-side current, depending on the measured LED voltage.
    For example, the compensation value InomDiffcalc can be calculated for the LED current 1050 mA to be set. The shift values V offset and Inom offset can first be read from a further table.
    Thus, for the LED current to be set, 1050 mA results e.g. a compensation value Inom Diff calc = 10 mA at the LED voltage Vcalc = 45.89 V.
    The shift values V offset, Inom offset of the table are thus applied to the values of the look-up table in order for compensation values Inom Diff calc for the desired value of the primary-side current or to the relationship for a desired LED current between the nominal value Inom for the primary-side current and the LED voltage.
    The compensation values Inom Diff calc calculated for the adjustable LED current 1050 mA are shown by way of example in FIG. 7, see FIG. there the curve marked “Calc”.
    For each adjustable LED current, two shift values V offset, Inom offset are stored in the table, the course of the primary-side electrical parameter depending on the LED voltage being able to be calculated on the basis of these shift values.
    According to the invention, provision is accordingly preferably made to save the course of a single curve, this curve being representative of each adjustable LED current in such a way that the setpoint value Inom dependent on the LED voltage can be derived by shifting this stored curve ,
    The look-up table can be expanded to include other dimensions, so that the influence of other variables - such as the temperature of the LEDs or the
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    Ambient temperature of the LEDs - it can be taken into account that a measurement is carried out by the manufacturer and the measured relationship is stored in another dimension of the look-up table.
    As an alternative to the look-up table, a function can of course also be stored, so that depending on the LED voltage, the temperature, etc., the primary-side current is modified accordingly by analytical evaluation. In this case the relationship between the primary side current and the quantities, e.g. LED voltage and / or temperature etc., defined by a given function.
    As already shown in connection with FIG. 1, the LED voltage Vled can thus be transmitted to the primary side via the galvanic lock. There is preferably no regulation on the secondary side. An integrated circuit 8, in the form of e.g. a microcontroller is provided on the secondary side, so that the transmission can then take place, for example, in a digital protocol via an optocoupler.
    8 shows a further exemplary embodiment of an LED converter for supplying an LED path. In this exemplary embodiment, both the measurement of the electrical characteristic on the primary side and the direct or indirect measurement of the LED voltage already shown in FIG. 1 are shown.
    The LED converter basically corresponds to the exemplary embodiment in FIG. 2. On the secondary side, the voltage Vled applied to the LED section is measured by means of a voltage divider RV1 and RV2 from a control unit 8 arranged on the secondary side. The control unit 8 measures or detects this voltage Vled and couples the voltage Vled or a variable representing the measured voltage back to the primary-side control unit 9 via an optocoupler 11. The data transmission via the feedback 10 can take place digitally, i.e. In this case, the optocoupler 11 is controlled by the secondary-side control unit 8 in accordance with a digital protocol.
    According to the invention, the LED voltage can either be measured directly on the secondary side, but it can also be detected indirectly, for example by electrical parameters on the primary side. For example, the relationship to the LED voltage could be established by detecting the voltage on the primary side.
    In this case, it would no longer be necessary to detect the LED line voltage on the secondary side, so that the aforementioned microcontroller and the transmission of this information via the galvanic lock can be eliminated.
    [00102] The measurements according to the invention are preferably carried out by the manufacturer of the LED converter. Likewise, the curves mentioned according to the invention or the look-up table and the further table are preferably stored on the primary side by the manufacturer in the control unit 9.
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    权利要求:
    Claims (14)
    [1]
    Expectations
    1. LED converter for supplying an at least one LED line with LED
    Current, showing:
    - a resonance converter (6) with a switching regulator having at least one switch (LS, HS),
    a galvanic lock (7), the primary side (Lm) of which is supplied by the switching regulator and the secondary side (Lt) is arranged in such a way that it supplies the LED path directly or indirectly with current
    - A control unit (9) arranged on the primary side for detecting a primary-side electrical parameter, whereby for generating a desired LED current, i.e. a desired current through the LED path, the control unit (9) regulates the detected primary-side electrical characteristic variable to a target value by controlling the switching regulator, the target value for the detected primary-side electrical characteristic variable being dependent on the detected LED voltage, the LED voltage being detected indirectly by the control unit (9) on the primary side.
    [2]
    2. LED converter according to claim 1, wherein for a desired LED current the corresponding target value for the primary-side electrical parameter is stored.
    [3]
    3. LED converter according to one of the preceding claims, wherein the dependence of the primary-side electrical parameter on the LED voltage to achieve a constant, desired LED current is stored.
    [4]
    4. LED converter according to one of the preceding claims, wherein the dependence of the primary-side electrical parameter on the LED voltage is stored in a look-up table or look-up table preferably provided on the primary side or is stored according to a function.
    [5]
    5. LED converter according to one of the preceding claims, wherein the target value for the detected primary-side electrical parameter is additionally dependent on at least one further variable, such as the temperature.
    [6]
    6. LED converter according to claim 5, wherein this additional dependency is also stored in the look-up table or is stored according to the function.
    [7]
    7. LED converter according to one of the preceding claims, wherein for different adjustable LED current values the corresponding profile or curve profile of the primary-side electrical parameter is stored as a function of the LED voltage.
    [8]
    8. LED converter according to one of the preceding claims, wherein for a plurality of adjustable LED current values, a single profile of the primary-side electrical characteristic is stored as a function of the LED voltage, and wherein displacement values (Voffset, Inom offset), which are stored to derive a compensation value (InomDiffcalc) for the primary-side electrical parameter.
    [9]
    9. LED converter for supplying power to at least one LED line comprising LED, comprising:
    - a resonance converter (6) with a switching regulator having at least one switch (LS, HS),
    a galvanic lock, the primary side of which is supplied by the switching regulator and the secondary side of which is arranged in such a way that it directly or indirectly supplies current to the LED section,
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    a control unit arranged on the primary side for detecting a primary-side electrical characteristic variable, wherein for generating a desired LED current, i.e. a desired current through the LED path, the control unit (9) regulates the detected primary-side electrical characteristic variable to a target value by controlling the switching regulator, the target value for the detected primary-side electrical characteristic variable depending on the detected temperature, the Temperature is detected on the primary side by the control unit (9).
    [10]
    10. LED converter according to one of the preceding claims, wherein the primary-side electrical parameter is a primary-side current, in particular the current through the primary side of the galvanic lock.
    4 sheets of drawings
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    1.4
    [11]
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    Patent office {> H 1
    C2
    [12]
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    3.4
    900mA
    1200mA - 1500mA
    -o- 1700mA
    VLED (V)
    Fig. 4
    VLEDvsINOMJiff
    Fig. 5
    1000nA
    1200mA
    1750mA
    [13]
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    4.4
    Fig. 6
    [14]
    14/14
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    法律状态:
    2019-12-15| MM01| Lapse because of not paying annual fees|Effective date: 20190430 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102013207675.4A|DE102013207675A1|2013-04-26|2013-04-26|Constant current converter for lighting equipment|
    PCT/AT2014/000093|WO2014172735A1|2013-04-26|2014-04-26|Constant current converter for lighting devices|
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