• 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:
    The invention provides a driver circuit for lighting means, in particular for an LED track with at least one LED, having a circuit which can be supplied with voltage and clocked by means of at least one switch, which supplies a resonant circuit by means of a transformer, from which the lighting means can be supplied Control circuit, which is adapted in a control circuit for controlling a luminous flux depending on a feedback signal, which represents an actual value of a current through the lighting means, and a signal representing a setpoint for the luminous flux, a control variable for the control of the luminous flux and to control in accordance with the at least one clocked switch, wherein a to the transformer secondary side circuit part of the driver circuit has at least one bypass path parallel to terminals for the lighting means, the bypass path selectively, in particular e is PWM-modulated, activatable / deactivatable.
    公开号:AT14866U1
    申请号:TGM261/2014U
    申请日:2014-06-23
    公开日:2016-07-15
    发明作者:
    申请人:Tridonic Gmbh & Co Kg；
    IPC主号:
    专利说明:

    description
    DRIVER SWITCHING FOR LEDS WITH SECONDARY-SIDED SELECTIVE SWITCHED BRIDGE PATH
    The present invention relates to a driver circuit for lighting and a converter for the operation of at least one light source, for. B. a driver circuit for the operation of at least one LED, with a secondary side selectively switchable bridging path. Furthermore, the invention relates to a method for operating a luminous means with the driver circuit.
    A driver circuit for operating lamps and in particular LEDs is basically known from the prior art. Such a driver circuit is powered from an electrical supply source and includes a resonant circuit, such as an LLC converter, which provides for the current to be galvanically isolated via a galvanic barrier from a primary side of the driver circuit on a secondary side of the driver circuit transmitted, or with respect to a transformer that feeds the resonant circuit. This serves the purpose of supplying power by means of transmission of electrical energy from the primary side to the secondary side to a light source which can be connected on the secondary side.
    The invention is now based on an LLC topology comprising a primary side arranged half-bridge inverter with subsequent resonant circuit. The resonant circuit feeds a transformer, from the secondary side starting an LED track with at least one LED can be supplied.
    From the prior art it is also known that for constant control of the luminous flux of the current through the primary side of the transformer can be detected as the actual value of the luminous flux.
    The galvanically isolating barrier may in particular be an SLV barrier (safety extra-low voltage barrier).
    It is also known that a dimming can be done with such a driver circuit by the switches of the high-frequency clocked half-bridge are switched off for a short time. This can be achieved by a low-frequency PWM modulation on the primary side of the driver circuit.
    The aim now is to provide an alternative circuit arrangement which allows to perform a secondary-side dimming, and thus to provide a simplification of the circuit.
    The invention therefore provides an apparatus and a method as defined in the independent claims. Further embodiments of the invention are the subject of the dependent claims.
    In a first aspect, a driver circuit for lighting, in particular for an LED track with at least one LED, provided comprising a voltage-supplied and clocked by at least one switch circuit which feeds a resonant circuit by means of a transformer, starting from the the lighting means are supplied, a control circuit which is adapted to in a control circuit for controlling a luminous flux as a function of a return signal, which represents an actual value of a current through the lighting means, and a signal representing a set value for the lighting means current to generate a manipulated variable for the regulation of the luminous flux and to control according to the at least one clocked switch, wherein a to the transformer secondary side circuit part of the driver circuit has at least one bypass path parallel to terminals for the lighting means, wherein the bridging Pf ad selectively, in particular PWM-modulated, activated / deactivated.
    A frequency of activation / deactivation may be low frequency compared to the switching frequency of the clocked switch.
    The timing of the at least one switch can be PWM-modulated.
    When the bridging path is activated, the luminous flux can be diverted to ground.
    The bypass path can short-circuit the secondary-side circuit part when activated at least partially.
    The control circuit can regulate the luminous flux when activated bridging path to the target value.
    The bridging path can be arranged between a lighting means and a storage capacitor. It can preferably bridge the storage capacitor when activated.
    The bridging path may be arranged between the secondary side of the transformer and a rectifier and / or capacitor following in the forward direction.
    The selective activation / deactivation of the bridging path can be effected by a control unit, in particular in dependence on a supplied dimming signal. The control unit can be arranged on the primary side or on the secondary side and, in particular, can be part of the control circuit.
    The at least one switch can be clocked at a frequency of 50-150 kHz, in particular 100 kHz.
    The bridging path can be selectively driven at a frequency of 100 Hz to 3 kHz.
    The at least one clocked switch can be deactivated upon activation of the bypass path of the control circuit.
    The at least one clocked switch may be part of a clocked inverter, in particular part of a clocked half-bridge.
    In a further aspect of the invention, the selective activation / deactivation of the bridging path can be timed, preferably synchronized, with a short-term shutdown of a clocked switch as part of a clocked inverter, in particular part of a clocked half-bridge, take place.
    In a further aspect, a luminaire is provided with a driver circuit as described above.
    In yet a further aspect, a method for operating a driver circuit for lighting, in particular for an LED track with at least one LED, provided wherein a voltage-supplied and clocked by at least one switch circuit, a resonant circuit by means of a transformer feeds from which the bulbs can be supplied, a control circuit in a control loop for controlling the luminous flux as a function of a feedback signal, which represents an actual value of a current through the light emitting means, and a signal representing a setpoint for the light bulb current, a manipulated variable is generated for the regulation of the lamp current and correspondingly controls the at least one clocked switch, wherein a to the transformer secondary side circuit part of the driver circuit has at least one bypass path parallel to terminals for the lighting means, wherein the bridging path selectively, i In particular PWM-modulated, activatable / deactivatable.
    The invention will now be described with reference to the figures. In the drawings: Fig. 1 shows a known circuit arrangement which represents the starting point of the invention; Fig. 2 shows a detail of the circuit of Fig. 1 according to the invention
    Further education; Fig. 3 shows schematically a first embodiment of the invention; Fig. 4 schematically shows a second embodiment of the invention; Fig. 5 schematically shows a third embodiment of the invention; A driver circuit which forms a starting point for the present invention is shown in FIG.
    The illustrated driver circuit 1 is fed on the input side by an input voltage Vdc. The input voltage Vdc is preferably a rectified and optionally filtered AC voltage or mains voltage. Preferably, this rectified mains voltage is still a converter in the form z. B. a power correction circuit (not shown) supplied before it supplies the driver circuit 1.
    The input voltage Vdc may also be a near-constant bus voltage. In the embodiment of FIG. 1, the input voltage Vdc, for example, an amplitude of 400 volts. The input voltage can also be called bus voltage or DC link voltage. Alternatively, the input voltage Vdc may also be a DC voltage or a constant voltage, such as a battery voltage.
    On the input side, a switching regulator is provided in the driver circuit 1, which is fed by the input voltage Vdc. The input voltage Vdc supplies in particular a clocked circuit and in particular an inverter, the z. B. may be configured in the form of a half-bridge circuit.
    In essence, the driver circuit has at least one clocked switch. The half-bridge circuit 2 shown has a potential lower switch LS and a potential higher switch HS. As an inverter with a switch can z. B. a fly-back converter (not shown, also called isolated flyback converter) may be provided.
    The series-connected switch LS, HS of the half-bridge circuit 2 can be used as transistors, for. B. FETs or MOSFETs be configured. The switches LS, HS are controlled by respective control signals S / LS, S / HS, starting from a half-bridge driver 12 of a control unit ST.
    Preferably, the switches LS, HS by the control signals S / LS, S / HS or by the half-bridge driver 12 alternately on and off. The mean value of the current through the lighting means can be adjusted by changing the drive frequency ASF of the switches LS, HS and / or by changing the duty cycle of the drive. The potential lower switch LS is connected to a primary-side ground. At the half-bridge circuit 2, the input voltage Vdc is applied.
    Between the two switches LS, HS, d. H. at the midpoint of the half-bridge circuit 2, a resonant circuit 3 in the form of a series resonant circuit (LLC) is connected. Alternatively, the middle point of the half-bridge circuit 2 may be connected to a parallel resonant circuit.
    The resonant circuit 3 shown in FIG. 1 is designed as a series resonant circuit and comprises inductance and capacitance elements. In particular, a series circuit comprising a first coil LR, a second coil LA and a capacitor CR is arranged between the primary-side ground and the center point of the half-bridge circuit 2. The resonant circuit 3 is referred to in this case as the LLC resonant circuit. The coil Lr and the capacitor Cr preferably form the resonance circuit and are referred to as a resonance coil and a resonance capacitor.
    The second coil La connected in series with the coil Lr and the capacitor Cr is preferably the primary winding of a transformer T which serves as a transformer for galvanic isolation. The transformer T bridges, for example, a galvanic barrier which is in
    FIG. 1 is shown as a safety extra low voltage barrier or SELV barrier 7 (safety extra low voltage barrier).
    The transformer T forms a total of a galvanic coupling between a primary side, comprising the primary winding La, and a secondary side, comprising a secondary winding Lb of the transformer T. In Fig. 1, the transformer T is shown as an ideal transformer, wherein the primary winding of the real Transformers may have a leakage inductance and a main inductance for guiding the magnetizing current.
    The secondary winding Lb of the transformer T has a tapping, in particular a Mittenpunktabzapfung, said Mittenpunktabzapap can serve as a secondary side mass. Relatively, the secondary winding Lb can consist of two separate windings, in which case the center point of these separate windings corresponds to the center tap.
    A terminal of the secondary winding Lb is connected to a first detection winding L1, the other terminal of the secondary winding Lb to a second detection winding LT. The first detection winding L1 and the second detection winding LT are preferably identical. Preferably, the respective number of turns nL1_sec, nL1'_sec of the detection winding L1 and LT are the same.
    In series with the first detection winding L1, a first diode D1 is connected. In series with the second detection winding LT, a second diode DT is connected. The detection coils L1, LT are connected to the anode of the diodes D1, DT.
    The respective cathodes of the diodes D1, DT are brought together, so that the diodes D1, DT form a rectifier circuit 4. During operation, an alternating current preferably flows through the secondary winding Lb of the transistor T. Depending on the direction of the alternating current, a current flows through the first diode D1 or through the second diode DT. At the output of the rectifier circuit 4, d. H. at the connection point of the diodes D1, DT, thus flows a rectified current. The rectifier is also referred to as a midpoint rectifier.
    The rectifier circuit 4 supplies a storage capacitor C2 on the output side. This storage capacitor C2 is preferably connected between the connection point of the diodes D1, DT and the center tap of the secondary winding Lb. As storage capacitor C2, an electrolytic capacitor can preferably be used because of its comparatively high capacity. The secondary-side current through the detection winding L1, LT is thus rectified by the rectifier circuit 4 and then preferably filtered or low-pass filtered to operate the lighting means.
    Parallel to the storage capacitor C2, the lighting means, preferably an LED track with at least one LED, connected.
    The driver circuit 1 has correspondingly two output terminals K1, K2, which are ready for the connection of the lighting means.
    In Fig. 1, the illustrated LED should be representative of one or more illuminants. Preferably, the light source operated by the driver circuit 1 may be a series connection of one or more LEDs. Alternatively, parallel LEDs or a combination of LEDs connected in parallel and in series can also be supplied.
    At the output of the rectifier circuit 4 and the storage capacitor C2, further components may be provided for filtering. By way of example, a coil L2 is shown in FIG. This coil L2 may preferably be arranged in series with the lighting means.
    This series circuit can be connected in parallel with the capacitor C2. The coil L2 is preferably connected between the output terminal K1 on the one hand and the connection point of the diodes D1, DT on the other hand. Between two output terminals K1, K2, the driver circuit may have a further storage capacitor or filter capacitor C3.
    In addition, a resistor R3 may be provided between the output terminal K2 and the center tap of the secondary winding Lb. As an alternative to the resistor R3, a further inductor (not shown) may also be provided.
    The detection winding L1, L1 'are coupled to a primary-side winding L1 ". The alternating current flowing through the secondary winding Lb of the transistor T is thus transformed by the secondary-side detection winding L1, LT into a primary-side current flowing through the primary-side winding L1" , The three windings L1, LT, LT 'thus form a detection transformer or preferably a potential-isolated detection transformer T1.
    The current through the primary-side winding L1 "reproduces the current through the secondary-side windings L1, LT, ie also the current through the lighting device." At least in terms of time, the current through the primary-side winding L1 "reproduces the mean value of the current the bulb.
    Here, of course, the ratio of the number of turns of the corresponding primary and secondary winding to each other to be considered. Preferably, the number of turns nL1 "_prim, nL1_sec, nL1'_sec of the primary and secondary side winding L1", L1, LT are the same.
    Preferably, the secondary winding Lb on the one hand and the detection windings L1, LT on the other hand are formed as separate windings. That is, the secondary winding Lb of the detection windings L1, LT form two separate transformers. This results in particular from the requirement that the detection transformer L1, LT, L1 "is preferably designed as a current transformer .The winding of the detection transformer L1, LT, L1" are in particular designed to enable the loss-free detection of the secondary-side current. By suitable choice of the winding, the detection transformer L1, LT, L1 "designed as a current transformer can have the lowest possible impedance.
    The alternating current through the detection windings L1, LT generates an alternating current in the coupled primary-side detection winding L1 ". An evaluation circuit 6 is connected to the primary-side detection winding L1" to generate a measured value Im for the current through the lighting means. This measured value Im is fed back to the control circuit ST.
    On the basis of the obtained reverse value Im, the control circuit ST generates the control signals S / LS, S / HS for the switches LS, HS. Starting from the actual value Im, the control circuit ST performs a current control to a desired setpoint value ILS by clocking the half-bridge circuit 2 accordingly.
    The evaluation circuit 6 serves in principle to evaluate or process the information supplied by the detection winding L1 "about the current through the at least one light source and then to return it to the control circuit ST In this embodiment, the detection signal L1 is coupled to a rectifier 5, which may be connected to a current measurement resistor Rshunt. The rectifier 5 can z. B. be used in the form of a full-bridge rectifier.
    According to the current measurement resistance Rshunt, a low-pass filtering (LPF) can take place, the actual value Im being filtered and, in particular, an average value of the actual value Im of the current being generated by the lighting means. This averaged value can be converted by an analog-to-digital converter (ADC) into a digital actual value.
    The measured actual value Im of the LED current is compared by the control unit ST with a desired value for the luminous flux ILS. The control unit ST comprises means, such as a comparator 9, for comparing the desired value ILS and the actual value Im.
    The control difference RDF resulting from the comparison for regulating the current through the lighting means results from this.
    Meanwhile, the target value ILS for the luminous flux can also be defined internally by the control unit ST.
    The control difference RDF is supplied to a controller 10, in which a control algorithm for the regulation of the luminous flux is implemented. The controller 10, which is in particular part of the control circuit ST, is preferably designed as a digital controller and can, for. B. be configured in the form of a P / Pl / PID controller. Depending on the supplied control difference, the controller generates a manipulated variable by means of which the half-bridge driver 12 is driven. The manipulated variable can z. B. the drive frequency ASF of the switches LS, HS and / or the duty cycle of the control of the switches LS, HS may be provided. In this case, the switches LS, HS of the half-bridge 2 are switched to high-frequency, typically in a frequency range of more than 10 kH or in a range of 50 to 150 kH and preferably at 100 kH.
    FIG. 2 shows a detail of the circuit from FIG. 1, which shows an embodiment of the circuit from FIG. 1 according to the invention.
    In the circuit shown in FIG. 2, it is now provided that at least one bypass path BP1-BP4 is selectively selectively switchable on the secondary side by a secondary-side control unit pP_sec in order to temporarily short-circuit depending on a dimming signal B supplied to the driver circuit. In Fig. 2, like reference numerals designate the components of the circuit described for Fig. 1. The half-bridge driver 12 illustrated in FIG. 2 as well as in FIGS. 3 to 5 is part of a control unit ST, with only the half-bridge driver 12 being shown in these illustrations for the sake of simplicity.
    The dimming command B can be specified externally.
    The driver circuit may be connected, for example, with a line and in particular a data line or a data bus for the transmission of particular digital commands, via which the dimming command B is supplied to the driver circuit. For this purpose, the driver circuit may be equipped with a data interface for data transmission between the driver circuit and an external communication unit (both not shown). The data transmission can alternatively be carried out analogously, but is preferably carried out by means of a protocol for the control of building services equipment. As a protocol z. As the DALI (Digital Addressable Lighting Interface) or the DSI (Digital Serial Interface) protocol can be used.
    The received dimming command B is converted by the secondary-side control unit pP_sec into control information for selectively activating / deactivating the at least one bypass path BP1-BP4. In this case, the secondary-side control unit pP_sec controls at least one switching means S in the at least one bypass path BP1-BP4 (also referred to as bypass path, stands for a circuit that short-circuits the selectively activatable short-circuit path) in order to activate / deactivate the at least one bypass path BP1-BP4, in particular, to de-energize the light source or to divert the light source current around the light source.
    It should be understood that the LLC circuit already described represents a substantially ideal current source and also in the case of a short circuit, d. H. upon activation of the at least one bypass path BP1-BP4 still regulates the current on the secondary side of the driver circuit to the desired value.
    In Fig. 2, various possibilities are now exemplified for a specific arrangement of the at least one bridging path.
    On the one hand, it is possible for a bypass path BP1 directly at the output of the driver circuit, ie. H. is arranged directly indirectly on the terminals K1, K2, ie after the storage capacitor C3. It should be noted here that after a short circuit, the capacitor C3 must first be reloaded in each case, since it discharges in the event of a short circuit via the bypass path BP1 when the switching means S is activated.
    A second possibility for an arrangement of a bridging path BP2 consists in the arrangement of the bridging path BP2 between the rectifying diodes D1, D1 here a diode DX may be provided to prevent a discharge of the capacitor C2, when the bypass path BP2 through the control unit pP_sec and activation of the switching means S is activated.
    However, preferred is an arrangement of a bypass path, as shown in Fig. 2 by a bypass path BP3, namely immediately after the secondary winding Lb of the LLC circuit. This bypass path BP3 must in each case have a diode in each of its branches, due to the induced AC voltage.
    Instead of a secondary-side control unit pP_sec, the selective activation / deactivation of the at least one bypass path BP1-BP4 can also be effected by a primary-side control unit pP_prim. In addition, the dimming signal B can also be preset internally instead of being externally supplied, for example, depending on a specific time or a specific period of time, sensory information supplied by the driver circuit (brightness, temperature,...) Or other operating parameters, for example, based on a table or a given function can be evaluated.
    Depending on this, the control unit pP_sec, pP_prim can selectively control the switching means S of the at least one bypass path BP1-BP4 by means of PWM clocking, the PWM clocking of the switching means S being low-frequency, ie, for example in the range of 100 Hz to 3 kH, but at least low frequency compared to the timing of the inverter 2 by the half-bridge driver 12th
    The selective activation / deactivation of the bypass path BP1-BP4 can, for example, be timed with a brief switch-off of the switches of the clocked half-bridge of the inverter 2.
    For example, the activation of the bypass path BP1-BP4 can be synchronized with the short-term switching off of the switches of the clocked half-bridge of the inverter 2 synchronized. However, it may also be the brief shutdown of the switches of the inverter 2 shortly after the activation of the bypass path BP1-BP4 done, and, for example, the reconnection of the switches of the inverter 2 shortly before disabling the bypass path BP1-BP4 done.
    By briefly switching off the switches of the inverter 2, a more energy-efficient operation of the circuit while retaining its functionality can be made possible, since only one energy is transmitted when the bridging path is not active and thus the LED is powered as a lighting means.
    As a further alternative for a bypass path is shown in Fig. 2, the bypass path BP4, which is connected between the capacitors C2 and C3, and preferably between the capacitor C2 and the other circuit components such as the inductance L2 and the resistor connected in parallel thereto R3.
    Meanwhile, a selective short-circuiting problem may be that the above-described control loop realized by the transformers T and T1, which measures the current on the output side of the transformer T and adjusts the frequency for the operation of the inverter depending on it, when switching on the bulb, d. H. upon deactivation of the at least one bypass path BP1-BP4 selects a frequency relatively close to the resonant frequency, with almost no energy transfer of the transformer takes place. However, in the case of selective short-circuiting, a jump to a very high frequency may then have to be selected, whereby a correspondingly low voltage is established at the output voltage of the LLC.
    Due to the predetermined boundary conditions of the control loop, and in particular due to their speed, it can thus at the beginning of short-circuiting by at least one bridging path BP1-BP4 to overshoot the voltage and to a relatively slow build-up of the voltage across the bulb when reactivating of the bulb come.
    This behavior can be compensated for by deactivating the inverter 2 and in particular at least one clocked switch of the inverter 2 synchronously in order to activate the at least one bypass path BP1-BP4.
    As illustrated in FIG. 2, detection of the primary-side current or the primary-side power can be arranged on the primary side of the driver circuit 1. As an example, here the resistance Rs is shown, by means of which the current can be detected by the inverter. By monitoring the primary-side current, for example via the resistor Rs, an activation of the bypass path BP1-BP4 can be detected indirectly by the control unit ST, without the need for communication between the primary-side control unit and the secondary-side control unit. By way of example, this will be explained later with reference to the embodiment of FIG. 5.
    FIGS. 3 to 5 now show exemplary embodiments of the circuit according to the invention and, in particular, a communication between primary-side and secondary-side control circuit components or the control units.
    FIG. 3 shows an embodiment in which the actual control intelligence is arranged on the secondary side of the LLC circuit, ie. h., That a secondary-side intelligent control unit (IC, ASIC, microcontroller) pP_sec measures a luminous flux.
    In addition, the secondary-side control unit pP_sec evaluates an internal or external supplied dimming command B and accordingly controls by means of PWM modulation the switching means S for deactivating / activating the at least one bypass path BP1-BP4. As shown in FIG. 3, the secondary-side control unit pP_sec controls, as an example, a FET driver, which then controls a corresponding switch. The result of the current measurement is supplied to the secondary-side control unit pP_sec.
    In addition, the secondary-side control unit pP_sec can communicate with a primary-side control unit pP_prim to the extent that it informs this primary-side control unit pP_prim that the at least one clocked switch of the inverter is to be deactivated on the basis of activating the at least one bypass path BP1-BP4. It is also possible that on the secondary side, the actual control loop for the frequency setting of the inverter or the at least one clocked switch is dependent on the measured luminous flux, so that the secondary-side control unit pP_sec the primary-side control unit pP_prim transmitted the frequency information to be set at an activated light source ,
    The information transmission from the secondary-side control unit pP_sec to the primary-side control unit pP_prim is preferably carried out galvanically separated and in particular via an optocoupler. The primary-side control unit pP_prim then supplies information corresponding to the half-bridge driver 12.
    In Fig. 4, an alternative is shown in which the main part of the circuit intelligence is provided on the primary side of the LLC circuit. A primary-side control unit pP_prim ', which may also be embodied as an integrated circuit (IC, ASIC, microcontroller), in turn controls a half-bridge driver 12, as shown in FIG.
    Potential separated on the secondary side of the driver circuit, the primary-side control unit pP_prim 'then detects the luminous flux on the secondary side of the LLC circuit and selectively and selectively activates the at least one bypass path BP1-BP4 on the secondary side of the LLC circuit.
    The secondary-side control unit pP_sec 'shown in FIG. 4 consequently serves only for the transmission of the detected parameters or of the detected luminous flux, which in turn preferably takes place in a potential-separated manner via, for example, an optocoupler. The secondary-side control unit pP_sec 'activates the switching means of the at least one bypass path BP1-BP4 based on an information transmitted via the galvanic barrier, for example transmission by a further optocoupler, which in turn may here be embodied as a FET transisotor which is connected via a FET Driver is controlled.
    Flier evaluates the primary-side control unit pP_prim 'the supplied internal or external dimming signal B and performs a corresponding control, in particular of the switching means of the at least one bypass path BP1-BP4.
    Finally, a third embodiment is shown schematically in FIG. 5, in which both on the secondary side a control unit pP_sec "and on the primary side a control unit pP_prim" are provided. In this embodiment, however, there is no communication between the control unit pP_sec "and the primary-side control unit pP_prim". The secondary-side control unit pP_sec "activates the at least one bypass path BP1-BP4 only depending on a supplied internal or external dimming information B.
    Alternatively, it can also be provided that the luminous flux is in principle also measured on the primary side of the LLC circuit, for example by means of an indirect measurement of the luminous flux by means of a current measurement on the primary side or due to a current measurement via the potential separation, for example by means of a detection winding L1 "according to the embodiment of Fig. 1. Here, however, it should be noted that this is associated with an unknown size of the magnetization component.
    5, in which the two control units pP_prim ", pP_sec" do not communicate with one another, upon activating the at least one bypass path BP1-BP4, the primary-side control unit pP_prim "will execute a frequency jump upward can be provided that on reaching an upper threshold for the frequency, the primary-side control unit pP_prim "the at least one clocked switch, in particular the half-bridge turns off or the half-bridge driver 12 accordingly controls without a corresponding shutdown information from the secondary-side control unit pP_sec" was transmitted. So this is not a strict synchronization.
    权利要求:
    Claims (15)
    [1]
    claims
    1. Driver circuit for lamps, in particular for an LED track with at least one LED, comprising: - a voltage supplied and clocked by at least one switch circuit which feeds a resonant circuit by means of a transformer, from which the bulbs are supplied, - a Control circuit, which is adapted in a control circuit for controlling a luminous flux depending on a feedback signal, which represents an actual value of a current through the lighting means, and a signal representing a setpoint for the luminous flux, a control variable for the control of the illuminant current and to control according to the at least one clocked switch, wherein - to the transmitter secondary side circuit part of the driver circuit has at least one bypass path parallel to terminals for the lighting means, the bypass path selectively, in particular PWM modulated, aktivi is achievable / deactivatable.
    [2]
    2. Driver circuit according to claim 1, wherein the frequency of the activation / deactivation in comparison to the switching frequency of the clocked switch is low frequency.
    [3]
    3. Driver circuit according to claim 1, wherein the timing of the at least one switch is PWM-modulated.
    [4]
    4. Driver circuit according to claim 1, wherein is derived with activated bridging path of the lamp current to ground.
    [5]
    5. Driver circuit according to claim 1, wherein the bypass path shorts the secondary-side circuit part when activated at least partially.
    [6]
    6. Driver circuit according to claim 1, wherein the control circuit controls the luminous flux when activated bridging path to the desired value.
    [7]
    7. Driver circuit according to claim 1, wherein the bridging path between the lighting means and a storage capacitor is arranged, and preferably bridges the storage capacitor when activated.
    [8]
    8. Driver circuit according to claim 1, wherein the bridging path between the secondary side of the transformer and a forward following rectifier and / or capacitor is arranged.
    [9]
    9. Driver circuit according to claim 1, wherein the selective activation / deactivation of the bridging path is performed by a control unit, in particular in response to a supplied dimming signal, wherein the control unit can be arranged on the primary side or secondary side and in particular may be part of the control circuit.
    [10]
    10. Driver circuit according to claim 1, wherein the at least one switch with a frequency of 50-150 kHz, in particular 100 kHz is clocked.
    [11]
    11. Driver circuit according to claim 1, wherein the bypass path is selectively driven at a frequency of 100 Hz to 3 kHz.
    [12]
    The driver circuit of claim 1, wherein the at least one clocked switch is deactivated upon activation of the bypass path by the control circuit.
    [13]
    13. Driver circuit according to claim 1, wherein the at least one clocked switch is part of a clocked inverter, in particular part of a clocked half-bridge.
    [14]
    14. luminaire with a driver circuit according to one of claims 1 to 13.
    [15]
    15. A method for operating a driver circuit for lamps, in particular for an LED track with at least one LED, wherein - a voltage supplied and clocked by at least one switch circuit, a resonant circuit by means of a transformer feeds, from which the bulbs are supplied, - A control circuit in a control circuit for controlling the luminous flux as a function of a return signal, which represents an actual value of a current through the lighting means, and a signal representing a desired value for the light source current, a manipulated variable for the regulation of the lamp current generates and correspondingly controls the at least one clocked switch, wherein - a to the transformer secondary side circuit part of the driver circuit has at least one bypass path parallel to terminals for the lighting means, the bypass path selectively, in particular PWM-modulated, activatable / deactivates bar is. 4 sheets of drawings
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    同族专利:
    公开号 | 公开日
    DE102014208169A1|2015-11-05|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20100079085A1|2007-03-13|2010-04-01|Koninklijke Philips Electronics N.V.|Supply circuit|
    US20120154260A1|2009-09-09|2012-06-21|Koninklijke Philips Electronics N.V.|Driving LED's|
    US20120181940A1|2009-09-30|2012-07-19|Koninklijke Philips Electronics N.V.|Dimming of led driver|
    DE102010003136A1|2010-03-23|2011-09-29|Osram Gesellschaft mit beschränkter Haftung|Circuit arrangement and method for operating at least one LED|DE202018101347U1|2017-05-24|2018-08-27|Hasslacher Holding Gmbh|Laminated timber element|
    法律状态:
    2019-02-15| MM01| Lapse because of not paying annual fees|Effective date: 20180630 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102014208169.6A|DE102014208169A1|2014-04-30|2014-04-30|Driver circuit for LEDs with secondary-side selectively switchable bridging path|
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