EP2837261B1 - Betriebsgerät für ein leuchtmittel und verfahren zum betreiben eines betriebsgeräts - Google Patents

Betriebsgerät für ein leuchtmittel und verfahren zum betreiben eines betriebsgeräts Download PDF

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Publication number
EP2837261B1
EP2837261B1 EP13725049.4A EP13725049A EP2837261B1 EP 2837261 B1 EP2837261 B1 EP 2837261B1 EP 13725049 A EP13725049 A EP 13725049A EP 2837261 B1 EP2837261 B1 EP 2837261B1
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EP
European Patent Office
Prior art keywords
voltage
operating device
power factor
factor correction
correction circuit
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13725049.4A
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German (de)
English (en)
French (fr)
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EP2837261A1 (de
Inventor
Hans Auer
Christoph VONACH
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Tridonic GmbH and Co KG
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Tridonic GmbH and Co KG
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Publication of EP2837261A1 publication Critical patent/EP2837261A1/de
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/59—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits for reducing or suppressing flicker or glow effects

Definitions

  • the invention relates to a control gear for a lighting means.
  • the invention relates to such operating devices having a power factor correction circuit.
  • a Power Factor Correction is used to eliminate or at least reduce harmonic currents in an input current. Harmonic currents can occur, in particular in the case of non-linear consumers, such as, for example, rectifiers with subsequent smoothing in power supplies, since in such consumers the input current is shifted in phase and distorted in a non-sinusoidal manner despite the sinusoidal input voltage. The occurring higher-frequency harmonics can be counteracted by an active or clocked power factor correction circuit upstream of the respective device. Power factor correction circuits are also used in operating devices for lamps, for example in electronic ballasts for discharge lamps or LED converters. The use of such circuits in devices for operating lamps is useful, since standards restrict the permissible return of harmonics in the supply network.
  • the operating device information can automatically determine a measured value based on a measurement and adjust an operating parameter depending on the measured value.
  • the EP 1 881 745 A1 describes that using a helical resistance measurement, a lamp type detection is performed. Ignition parameters are set according to this lamp type detection and the lamp is started. From the ignition voltage is closed to the power and turn from this power to the correct lamp type detection for this performance present parameters for a power factor correction circuit.
  • the WO 2009/146934 A2 describes methods and devices in which, starting from a parameter of an active power factor correction circuit ("PFC"), in particular the measured on-time of a PFC switch, at least one operating parameter of the operating device are set.
  • PFC active power factor correction circuit
  • the DE 10 2008 027 029 D1 discloses a method for lamp type detection of a connected to an operating device gas discharge lamp of a load circuit according to the preamble of claim 12 and a suitably ausgestaltetes operating device according to the preamble of claim 1.
  • the operating device comprises a controlled by a switch power factor correction or PFC circuit.
  • the method has the steps of a) operation of the gas discharge lamp with a defined mode of operation, b) evaluation of at least one parameter of the PFC circuit and c) regulation of the power provided by the PFC circuit.
  • the DE 10 2010 031 247 A1 discloses an LED lighting system in which a control unit can monitor a bus voltage and drive an inverter depending on an evaluation of the ripple of the bus voltage.
  • the DE 10 2010 031 239 A1 discloses an LED operating circuit in which a control unit can monitor a ripple of a bus voltage and drive a constant current source depending on an evaluation of the ripple of the bus voltage.
  • the detection of a load at the output of the operating device can be particularly challenging if the operating device is a so-called SELV ("Separated Extra-Low Voltage” or “Safety Extra-Low Voltage”) device.
  • SELV Separated Extra-Low Voltage
  • a potential separation between a SELV side with low voltages and a Non-SELV side which is galvanically isolated from the SELV side.
  • Such a galvanic separation or potential separation is required for safety reasons in operating devices for lighting to separate an ELV ("extra low voltage”) - area by a so-called potential barrier or SELV barrier of areas with higher supply voltage, especially mains voltage.
  • a further object is to specify devices and methods in which, in the case of an operating device with potential barrier, detection of a measured variable on the secondary side is not necessarily required for a load detection.
  • an operating device for a luminous means and a method with the features specified in the independent claims are specified.
  • the dependent claims define advantageous and preferred embodiments of the invention.
  • an operating device includes a power factor correction circuit that provides a voltage to a converter.
  • the transducer may be an isolated or non-isolated resonant converter, such as an LLC resonant converter.
  • An output of the converter which can also serve as the output of the operating device, supplies a lighting means with energy during operation.
  • a control device of Power factor correction circuitry may be configured and configured to determine a load connected to the output of the converter using a map based on the evaluation of voltage ripples, in particular the peak-to-peak voltage in the voltage that the power factor correction circuit provides to the converter.
  • the controller may be further configured to determine samples of the voltage during a time interval.
  • the methods and devices of embodiments allow the detection of a load based on the evaluation of voltage ripples, in particular the peak-to-peak voltage in the voltage provided by the power factor correction circuit.
  • the measured variable which is evaluated for load detection, is recorded on the primary side.
  • the detection of a measured variable on the SELV side of the operating device is not absolutely necessary for load detection.
  • the controller may be configured to detect a number of LEDs energized by the output of the converter. These or other load detections are possible based on the amplitude of voltage ripples in the voltage provided by the power factor correction circuit without having to return a measure across the SELV barrier.
  • the controller may determine the load using a map, such as a table query.
  • the controller may use the load thus determined to determine based on another map, for example, by another table query, parameters for the operation of the converter to be used for the detected load.
  • the control device can control the operation of the operating device depending on the detected load in different ways.
  • control device can be set up to set a light intensity of the luminous means to a desired value as a function of the detected load. Alternatively or additionally, the control device can be set up be to suppress a color shift depending on the detected load. Alternatively or additionally, the control device can be set up to suppress flickering depending on the detected load.
  • the control device can act in different ways on the operation of the operating device to control this depending on the detected load.
  • the controller may select an operation mode for the power factor correction circuit depending on the detected load.
  • the controller may select, depending on the detected load, whether the power factor correction circuit is operating in a DCM ("Discontinuous Conduction Mode") mode or at the boundary between continuous and continuous current through the inductance, i. in BCM (Borderline Conduction Mode or Boundary Conduction Mode) operation.
  • the controller may also select operating parameters for the power factor correction circuit depending on the detected load. For example, the controller may adjust the on-time ("tone" time) of the power factor correction circuit breaker in BCM mode depending on the detected load. Alternatively or additionally, the controller may set the wait time or minimum wait time prior to turning on the power factor correction circuit breaker in DCM operation depending on the detected load.
  • the controller may also select an operating mode for the converter depending on the detected load.
  • the controller may select, depending on the detected load, whether the converter is to be operated in a pulsed mode in which a half-bridge or full-bridge of the converter is turned off for a certain time interval, or whether the converter is to be operated in a continuous mode, for example Amplitudendimmen.
  • the control device can automatically set operating parameters for the converter, for example a switching frequency of switches of the half bridge or full bridge of the converter.
  • the operating device can be designed as a constant current source.
  • the operating device can also be designed as a constant voltage source.
  • the operating device can be designed so that a control is carried out on the output voltage of the operating device.
  • the control device may be in the form of an integrated circuit, in particular an application-specific special circuit (ASIC, "application-specific integrated circuit”).
  • ASIC application-specific integrated circuit
  • FIG. 1 shows a block diagram representation of a lighting system 1, which comprises a control device 2 for a lighting means 3, for example for LEDs.
  • the operating device 2 may be connected to a bus 4 or a wireless communication system be connected to receive dimming commands and / or output status messages.
  • the operating device 2 can be designed, for example, as an electronic ballast (ECG) for a gas discharge lamp, fluorescent lamp or another fluorescent illuminant or as an LED converter.
  • ECG electronic ballast
  • the operating device 2 has a rectifier 10 for rectifying a supply voltage, for example the mains voltage.
  • the operating device 2 has a power factor correction circuit 11.
  • the operating device 2 has a control device 14.
  • the power factor correction circuit 11 provides a voltage Vbus, which is also referred to as a bus voltage, for downstream components of the operating device 2.
  • Another voltage conversion and / or dimming functions can be achieved, for example, via a converter 12, which can be designed as a resonant converter.
  • the converter 12 may include a transformer or other converter to achieve galvanic isolation between a SELV side and a non-SELV side of the operating device.
  • the rectifier 10 can be connected to an AC voltage, in particular to a mains voltage, possibly via a high-frequency filter.
  • the power factor correction circuit 11 may receive a rectified AC voltage from the rectifier 10 as an input voltage.
  • the power factor correction circuit 11 performs smoothing functions and generates a DC voltage Vbus provided to the converter 12.
  • the voltage generated by the power factor correction circuit 11, which is used as the supply voltage for the converter 12 still has voltage ripples, i. has a ripple.
  • the controller 14 may control the power factor correction circuit 11 and / or the converter 12 in response to a load 3 at the output of the converter 12.
  • the control device 14 is set up to load 3 depending on an evaluation, in particular the peak-to-peak voltage of Recognize voltage ripple of the voltage Vbus, which provides the power factor correction circuit 11 to the transducer 12.
  • the controller 14 may control the operation of the operating device depending on the detected load. Exemplary for the detection of the load is the automatic detection of a number of LEDs or the otherwise automatic detection of properties of the luminous means 3.
  • FIG. 2 is a circuit diagram of the operating device 2 according to an embodiment.
  • the operating device 2 generally has a power factor correction circuit 20, a power factor correction circuit 20 downstream converter 30 and the control device 14 on.
  • the converter 30 can be configured in particular as a resonant converter.
  • An input 19 of the power factor correction circuit 20, a rectified AC voltage can be supplied as the input voltage Vin.
  • the rectified AC voltage need not be the input voltage of the operating device 2.
  • a rectifier 10 may be provided which rectifies a mains voltage and provides as input voltage Vin to the power factor correction circuit 20.
  • the power factor correction circuit may include the topology of a boost converter.
  • the rectified AC voltage Vin is supplied to an inductance or coil 21.
  • the inductor 21 is connected in series with a diode 22 between the input terminal and an output of the power factor correction circuit 20.
  • the output of the power factor correction circuit 20 is connected to an input of the converter 30 and provides the voltage Vbus generated by the power factor correction circuit 20 as a supply voltage to the converter 30.
  • the power factor correction circuit 20 has a charging capacitor 23 at the output of the power factor correction circuit 20.
  • a controllable electronic switch 24 which is a power switch and which can be designed, for example, as a field-effect transistor (FET), in particular as a MOSFET.
  • FET field-effect transistor
  • the switch 24 may have a shunt resistor (not shown) connected to ground.
  • the switch 24 is switched by the control device 14 of the operating device 2 in the on state and the off state.
  • the control device 14 has a corresponding output 52 for controlling a PFC control signal, with which, for example, the gate voltage of the switch 24 can be controlled.
  • the inductance 21 When the switch 24 is switched on, the inductance 21 is connected to ground via the switch 24, the diode 22 blocking, so that the inductance 21 is charged and energy is stored in the inductance 21.
  • the switch 24 is turned off, i. open, the diode 22 is conductive, so that the inductor 21 can discharge via the diode 22 in the charging capacitor 23 and the energy stored in the inductance 21 is transferred to the charging capacitor 23.
  • the switch 24 is driven by the control device 14, which may be configured in the form of an integrated circuit, in particular as an ASIC.
  • the power factor correction is achieved by repeatedly turning on and off the switch 24, where the switching frequency for the switch 24 is much greater than the frequency of the rectified AC voltage Vin.
  • the converter 30 receives the supply voltage Vbus provided by the power factor correction circuit 20 at the output of the power factor correction circuit 20.
  • the transducer 30 may include an electrolyte to achieve electrical isolation between a non-SELV side of the driver 2 and a SELV side of the driver 2.
  • a corresponding potential barrier 49 or SELV barrier 49 separates the non-SELV side of the operating device 2 from the SELV side of the operating device 2.
  • the converter 30 has a transformer with a primary coil 34 and a secondary coil 36.
  • Converter 30 may be configured as a half-bridge drive LLC resonant converter including an LLC resonant circuit.
  • the primary coil 34 of the transformer may also act as one of the inductors of the LLC resonant circuit.
  • the LLC resonant circuit includes another inductor 33 and a capacitor 35.
  • the LLC resonant circuit with the Inductors 33, 34 and the capacitor 35 may be configured as a series resonant circuit.
  • the smaller inductance 33 of the LLC resonant circuit may also be integrated into the transformer and may be, for example, a leakage inductance of the primary coil 34.
  • the converter 30 is controlled on the primary side by clocked switching of switches 31, 32 of a half-bridge.
  • the switches 31, 32 can be designed as field-effect transistors (FETs), in particular as MOSFETs.
  • the control device 14 can effect a mutually clocked switching of the switches 31, 32.
  • the control of the switch is such that in each case a maximum of one of the switches 31, 32 is turned on.
  • the control device 14 can control the half bridge with the switches 31, 32 in different operating modes. In a first mode of operation, a switching frequency of the switches 31, 32 may be changed relative to a resonant frequency of the LLC resonant circuit to achieve amplitude dimming. In a second mode of operation, the half-bridge may be controlled to result in pulsed operation of the converter 30.
  • both switches 31, 32 are switched to the off state over a certain period of time.
  • the corresponding selection of the operating mode and / or of operating parameters can be carried out automatically by the control device 14 based on a detected load 3 at the output 41 of the operating device 2.
  • the detection is based on a peak-to-peak voltage of voltage ripples, as described in more detail below.
  • the control device 14 is designed to generate control signals which can be controlled via a first output 53 coupled to the first switch 31 and a second output 54 coupled to the second switch 32.
  • the converter 30 has a secondary side with a secondary coil 36 of the transformer.
  • the secondary side may comprise a rectifier with diodes 37, 38 and a capacitor 39 at the output of the rectifier.
  • an inductance 40 may be connected in front of the output 41 of the converter 30. The inductance 40 may also be omitted, for example when the converter 30 is operated as a constant voltage source.
  • a load 3 may be coupled and in particular conductively connected.
  • the load 3 may comprise a plurality of light-emitting diodes (LEDs).
  • the load 3, which is a luminous means, may comprise inorganic and / or organic LEDs.
  • the LEDs can be connected in parallel, as shown schematically in FIG FIG. 2 shown.
  • the LEDs can also be connected in series, or a combination of series and parallel circuits can be used:
  • the controller 14 is configured to automatically detect the load 3 or an output power output via the output 41.
  • the time-dependent voltage Vbus which provides the power factor correction circuit 20 to the converter 30 as a supply voltage, is evaluated, as with reference to FIG FIG. 3-6 will be described in more detail.
  • the controller 14 may automatically adjust the operation of the power factor correction circuit 20 and / or the converter 30 to different operating modes and / or operating parameters depending on the detected load.
  • the control device 14 is supplied with a measured variable with which the control device 14 can detect the voltage Vbus.
  • the control device 14 can detect the voltage Vbus in a time-resolved manner via a voltage divider with resistors 26, 27, which voltage is supplied as a supply voltage to the converter 30 by the power factor correction circuit 20.
  • An A / D conversion can take place before the corresponding measured variable is fed to an input 51 of the control device 14.
  • i (t) is a time-oscillating charging current of the charging capacitor and C is the capacity of the charging capacitor.
  • the voltage ripples which are caused by the first term on the right side of equation (1), have a peak-to-peak voltage which depends on the load 3 at the output 41 of the converter 30, even if the output 41 is galvanically isolated from the measuring point at which the voltage Vbus for the control device 14 is detected.
  • FIG. 3 illustrated for in FIG. 2 illustrated circuit the dependence of the peak-to-peak voltage of the voltage ripple of the load.
  • the load changes by more than a factor of ten.
  • Exemplary of such a change in load is the change in the number of LEDs energized by the operating equipment. A change in the number of LEDs can also occur during operation, for example due to a failure of LEDs.
  • the change in load results in a change in the peak-to-peak voltage of the voltage ripple in the voltage Vbus that the power factor correction circuit 20 provides.
  • peak-to-peak voltage 70 can be detected, for example, as a difference between the maximum and minimum of the voltage Vbus in a period, ie as a voltage difference.
  • This load dependency of the peak-to-peak voltage 70 of the voltage ripple in the voltage Vbus allows the detection of the load based on an evaluation of the voltage ripple and in particular based on its voltage difference between minimum and maximum of the voltage Vbus.
  • a characteristic, as exemplified in FIG. 3 and which sets the load in relation to the peak-to-peak voltage of the voltage ripple, may be used by the load sensing controller 14.
  • a corresponding map can be used.
  • FIG. 4 illustrates the determination of the peak-to-peak voltage 70 of the voltage ripple.
  • the rectified AC voltage 61 is supplied to the power factor correction circuit 20.
  • a period of not rectified AC voltage corresponds to two periods 62 of the rectified AC voltage 61.
  • the voltage Vbus provided by the power factor correction circuit 20 is sampled.
  • the resulting samples 65, 66, 67, 68 may be evaluated to determine a peak-to-peak voltage 70 of the voltage ripple 64.
  • the controller 14 determines a maximum 68 and a minimum 67 of the samples that occur during the period 62. A difference between the maximum 68 and the minimum 67 may be used as a measure of the peak-to-peak voltage of the voltage ripple.
  • the controller may apply a sine curve to the samples 65, 66, 67, 68 to determine the amplitude as one of the two fit parameters.
  • the following example illustrates the operation of the controller 14 in load detection.
  • a measured variable representing the voltage Vbus is received by the control device 14 at an input or detected at a measuring point.
  • An A / D conversion can be made.
  • automatic amplitude detection can be performed.
  • the amplitude of the voltage ripple is determined.
  • the determined amplitude can be used to detect the load.
  • the load can be determined, for example, by a table query.
  • a map may be used to determine the load based on the amplitude.
  • a computational determination for example, based on an algorithm instead of the table possible. In a computational determination or a table query and compensation for the aging of the operating device 2 can be considered.
  • the control device 14 of the operating device 2 can perform other functions.
  • the control device 14 of the operating device 2 may depend on the detected load, i. depending on the determined peak-to-peak voltage of the bus voltage Vbus, automatically set an operating mode of the power factor correction circuit 20, operating parameters of the power factor correction circuit 20, an operating mode of the converter 30 and / or operating parameters of the converter 30.
  • FIG. 5 shows the operation of the controller 14 according to an embodiment in a functional block diagram.
  • the controller 14 may include logic 81 for determining the peak-to-peak voltage of the voltage ripple in the voltage Vbus provided by the power factor correction circuit 20.
  • the logic 81 may use a map to determine a load. Various functions can be adjusted based on the load at the output of the converter.
  • the controller 14 may include a function 82 for selecting an operating mode of the power factor correction circuit.
  • the function 82 may automatically select an operating mode for the power factor correction circuit 20 depending on the detected load.
  • the function 82 may select, depending on the detected load, whether the power factor correction circuit is in a DCM ("Discontinuous Conduction Mode") operation or in the boundary region between continuous and continuous current through the inductance, ie in BCM ("Borderline Conduction Mode” or "Boundary Conduction Mode”) Conduction Mode ”) operation is to be operated. If other modes of operation are available for the power factor correction circuit 20, the function 82 may accordingly select one of the modes of operation, such as a CCM (Continuous Conduction Mode) mode of operation.
  • the function 82 may also select operating parameters for the power factor correction circuit depending on the detected load. For example, the controller may adjust the on-time ("tone" time) of the power switch 24 of the power factor correction circuit 20 in BCM operation depending on the detected load. Alternatively or additionally, the control device can set the waiting time or minimum waiting time before switching on the power switch 24 of the power factor correction circuit 20 in DCM operation depending on the detected load.
  • the control device 14 may have a function 85 for half-bridge control of the converter 30.
  • the function 85 may select, depending on the detected load, whether to operate the transducer 30 in a pulsed mode in which a half-bridge or full-bridge of the transducer is turned off for a particular time interval, or whether the transducer 30 is to be operated in a continuous mode , for example for amplitude dimming.
  • the function 85 can automatically set operating parameters for the converter depending on the detected load, for example a switching frequency of the switches 31, 32 of the half-bridge of the converter 30.
  • the control device 14 can have further functions, for example a function 83 for suppressing load-dependent color errors and / or a function 84 for load-dependent adaptation of an intensity control or intensity control of the light output by the light source 3.
  • Other functions for load-dependent control and / or regulation of the power factor correction circuit 20 and / or the converter 30 can be realized.
  • the controller 14 may be configured to map-based the various functions for adjusting the operation of the operating device to the detected load. For this purpose, for example, further maps may be provided which indicate operating modes and / or operating parameters for the operation of the operating device 2 as a function of the load.
  • the map that relates the peak-to-peak voltage of the voltage ripple to the load and the maps that relate the load to operating parameters may be used also be executed in combination.
  • differential peaking detection of peak-to-peak voltage of voltage ripples has been described, other techniques may be employed, such as determining the peak-to-peak voltage of the voltage ripple as a fit parameter from a fit or by evaluating the amplitude of the voltage or voltage ripple ,
  • the determination of the load from a peak-to-peak voltage of voltage ripples can also be done by arithmetic evaluation of a function.
  • Inductances and capacitances of the power factor correction circuit and / or of the converter can be designed as separate inductive or capacitive elements. Especially smaller inductors and capacitors of the power factor correction circuit and / or the converter can also be parasitic inductances and capacitances.
  • Methods and devices according to embodiments can be used in operating devices for lighting, for example in an electronic ballast or an LED converter.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)
EP13725049.4A 2012-04-13 2013-04-15 Betriebsgerät für ein leuchtmittel und verfahren zum betreiben eines betriebsgeräts Active EP2837261B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102012007453 2012-04-13
DE102012014308A DE102012014308A1 (de) 2012-04-13 2012-07-19 Betriebsgerät für ein Leuchtmittel und Verfahren zum Betreiben eines Betriebsgeräts
PCT/AT2013/000071 WO2013152373A1 (de) 2012-04-13 2013-04-15 Betriebsgerät für ein leuchtmittel und verfahren zum betreiben eines betriebsgeräts

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EP2837261A1 EP2837261A1 (de) 2015-02-18
EP2837261B1 true EP2837261B1 (de) 2018-10-10

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EP (1) EP2837261B1 (zh)
CN (1) CN104412707B (zh)
DE (1) DE102012014308A1 (zh)
WO (1) WO2013152373A1 (zh)

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DE102013222892B4 (de) * 2013-11-11 2024-05-16 Tridonic Gmbh & Co Kg LED-Konverter und Verfahren zum Steuern einer Wandlerschaltung eines LED-Konverters
DE102015207433A1 (de) * 2015-04-23 2016-11-10 Tridonic Gmbh & Co Kg Betriebsschaltung, Leuchte und Verfahren zum Erfassen eines Steuersignals
WO2020082324A1 (en) * 2018-10-26 2020-04-30 Tridonic Gmbh & Co Kg Method and apparatus of adjusting parameter for electrical device

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US6700335B2 (en) * 2001-09-28 2004-03-02 Osram Sylavania, Inc. Method and circuit for regulating power in a high pressure discharge lamp
EP1881745B1 (en) 2006-07-20 2010-04-14 STMicroelectronics Srl Process for recognizing the supply power of discharge lamps and related device
US7759881B1 (en) * 2008-03-31 2010-07-20 Cirrus Logic, Inc. LED lighting system with a multiple mode current control dimming strategy
DE102008027029A1 (de) * 2008-06-06 2009-12-10 Tridonicatco Gmbh & Co. Kg Lampentyperkennung durch Leistungsfaktorkorrekturschaltung
CN201557292U (zh) * 2009-10-01 2010-08-18 英飞特电子（杭州）有限公司 一种高效率恒流led驱动器
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DE102010031247A1 (de) * 2010-03-19 2011-09-22 Tridonic Ag Niedervolt-Spannungsversorgung für ein LED-Beleuchtungssystem
DE102010031239A1 (de) * 2010-03-19 2011-09-22 Tridonic Ag LED-Ansteuerung mit getakteter Konstantstromquelle
CN201789664U (zh) * 2010-08-20 2011-04-06 深圳市雅玛西电子有限公司 一种半桥llc谐振led电源
CN101932175B (zh) * 2010-08-31 2013-03-13 电子科技大学 一种具有自动调光功能的照明led恒流驱动电路

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CN104412707A (zh) 2015-03-11
EP2837261A1 (de) 2015-02-18
CN104412707B (zh) 2017-03-08
DE102012014308A1 (de) 2013-10-17
WO2013152373A1 (de) 2013-10-17

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