WO2015010580A1 - Led照明驱动电路 - Google Patents
Led照明驱动电路 Download PDFInfo
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- WO2015010580A1 WO2015010580A1 PCT/CN2014/082572 CN2014082572W WO2015010580A1 WO 2015010580 A1 WO2015010580 A1 WO 2015010580A1 CN 2014082572 W CN2014082572 W CN 2014082572W WO 2015010580 A1 WO2015010580 A1 WO 2015010580A1
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- voltage
- power
- led
- current
- comparator
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Classifications
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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]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
-
- 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]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
- H05B45/397—Current mirror circuits
-
- 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]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
-
- 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]
- H05B45/60—Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Definitions
- the invention belongs to the field of digital-analog hybrid integrated circuits, and in particular to an LED lighting driving circuit. Background technique
- High-power LEDs are gradually replacing traditional incandescent lamps, fluorescent lamps, etc. with their advantages of high efficiency, energy saving, environmental protection, long life and high reliability, making them a new generation of illumination sources.
- high-power illumination LED performance With the improvement of high-power illumination LED performance and the reduction of production cost, its application field is expanding from the field backlight and some landscape lighting fields with low brightness requirements to the ordinary white light illumination field.
- the driver integrated circuits for power LEDs have also been greatly developed due to the gradual popularization of power LED applications. Therefore, designing an efficient and reliable LED lighting driver circuit is especially critical.
- the power factor of the lighting equipment is getting more and more attention.
- the power factor of the lighting equipment reaches the optimal value.
- the luminous intensity of the LED and the current flowing through the LED are proportional to a certain range.
- the current flowing through the LED needs to be within a certain range and the effective value is constant.
- LED lighting drive circuits often use large-capacity transformers to convert energy, occupy a considerable amount of space, and use polarized high-voltage electrolytic capacitors. After long-term use, the life of components is rapidly shortened, which may cause problems such as poor product reliability. .
- the present invention proposes a novel LED lighting driving circuit, which does not require transformer conversion energy, does not require high voltage electrolytic capacitor, high power factor, and can A new circuit structure for driving high voltage LEDs in a constant current rms mode.
- an LED illumination driving circuit for supplying power to N sets of LED loads, comprising N current paths, N groups of LEDs, and a constant current portion, N being an integer not less than 2, the N path
- the current path includes: a voltage dividing portion connected to the half sine wave power source for reducing a power supply voltage of each of the N current paths to a voltage value usable by the current path; a comparator portion including N comparators of the N current paths, one input of each of the comparators is connected to an output end of the voltage dividing portion, and the other input terminal is connected to a reference voltage for outputting correspondingly when the voltage changes a control signal; a logic control unit having N input terminals connected to the N output ends of the comparator portion for respectively outputting N enable signals according to the control signal outputted from the comparator portion; a driving portion, wherein the N input terminals are connected to the N output ends of the logic control portion for providing N voltages according to the N enable signals; and the switch portion includes N switching elements, N input
- the voltage dividing portion includes N voltage dividing resistors connected in series between the power source and the ground, except that the first resistor R1 is connected to the first current path only at a negative end thereof near the ground end.
- the ith voltage-divider resistor Ri is also connected to the comparator of the i-1th current path at its positive terminal near the power supply terminal, and to the comparator of the ith current path at its negative terminal, where ⁇
- a positive phase terminal of each comparator of the comparator portion is connected to a negative terminal of a voltage dividing resistor of a current path, and an inverting terminal of each comparator is connected to a constant reference voltage.
- the logic control unit includes a NOR gate in the first current path, and sequentially includes one NOR gate and two inverters in each of the ith current path, wherein 2 i Nl, comprising three inverters in sequence in the Nth current path, one input of each of the NOR gates is connected to the output of the comparator in the current path, and the other input is connected to the Between the two inverters at the output of the logic control.
- the switching element is a power MOS transistor, and a gate of the power MOS transistor is connected to an output end of the driving portion to control the power MOS transistor according to the enable signal. Turning on and off, the drains of the power MOS transistors are respectively connected to the N groups of LEDs, and the source of the power MOS transistors is connected to the output ends of the constant current portions.
- the constant current portion includes: a voltage dividing resistor Ra and Rb connected in series between a power source and a ground, an error amplifier, a power MOS transistor, and a sampling resistor, a positive phase terminal of the error amplifier Connected between the resistors Ra and Rb, the inverting terminal thereof is connected to the source of the power MOS transistor and one end of the sampling resistor, and the output end thereof is connected to the gate of the power MOS transistor, and the other end of the sampling resistor is grounded, and The drain of the power MOS transistor is connected as an output terminal to the switch portion.
- the resistor R1 is much larger than the resistor Ri, wherein i N , and the resistor Ra are much larger than the resistor Rb.
- the power MOS tubes are high voltage power tubes, and the withstand voltage is greater than a maximum threshold of each group of LEDs.
- the inverting terminal reference voltage of each of the comparators is supplied with a constant magnitude of voltage by another power supply module.
- the output instantaneous current of the constant current portion is:
- VAMP is the positive phase terminal instantaneous voltage of the error amplifier
- R 3 ⁇ 4 « is the resistance of the sampling resistor.
- the main working process of the LED lighting driving circuit of the present invention is: when the power supply voltage (mains When the bridged rectified half sine wave is zero, the power MOS transistors M1 to M5 are all turned on. As the power supply voltage gradually rises to the turn-on threshold voltage of the first group of high voltage LEDs, the LED 1 is lit, and the current passes through Ml. Tube, M6 tube to ground, the voltage continues to rise. When the voltage reaches the conduction threshold voltage of the second group of high voltage LEDs, the voltage division of the VP1 terminal of the comparator COMP1 is first increased to a constant reference voltage greater than the VREF terminal.
- the output level of COMP1 jumps.
- the power MOS transistor M1 is turned off.
- the power transistors M2, M3, M4, and M5 remain open.
- the first group and the second group of high-voltage LED groups LED1 and LED2 are Light up. Then the voltage continues to rise.
- the voltage is divided by the resistor.
- the voltage of the VP2 terminal of the comparator COMP2 is increased to a constant reference voltage greater than the VREF terminal, and the output level of the comparator COMP2 occurs.
- the voltage begins to drop, and the power tubes M4, M3, M2, and Ml are turned on in turn, and the high-voltage LED group is sequentially turned off, so that the cycle is reciprocating, because the frequency of the voltage change is faster, exceeding the recognition time of the human eye, and the whole process is not observed.
- the power tube M5 is always kept open.
- FIG. 1 is a schematic structural view of an LED illumination driving circuit of the present invention
- FIG. 2 is a view showing a preferred configuration of a comparator in the LED illumination driving circuit of the present invention
- FIG. 3 is a view showing a preferred configuration of a logic control portion in the LED illumination driving circuit of the present invention
- Fig. 4 is a diagram showing current and voltage simulation waveforms in the LED illumination driving circuit of the present invention. detailed description
- Fig. 1 is a view showing the structure of an LED illumination driving circuit of the present invention.
- the LED illumination driving circuit of the present invention is used for supplying power to N sets of LED loads, and thus includes N current paths (N is an integer not less than 2), and the power of the entire circuit is a half sine wave after the mains is bridge-rectified.
- N is an integer not less than 2
- the power of the entire circuit is a half sine wave after the mains is bridge-rectified.
- five sets of LED loads are taken as an example for description, but the present invention is not limited thereto. Any N sets of LED loads are applicable to the LED illumination driving circuit of the present invention, and only need to increase current according to similar rules. The number of channels is sufficient.
- the LED illumination driving circuit includes N current paths and a constant current portion 600.
- the N current paths respectively drive N groups of LED load lights, and each current path sequentially includes the following parts: a voltage dividing portion 100, a comparator The unit 200, the logic control unit 300, the power drive unit 400, and the switch unit 500.
- the voltage dividing section 100 is connected to a power source for lowering the power supply voltage to a voltage value usable by the current path.
- the voltage dividing portion 100 includes N voltage dividing resistors, for example, R1 R R5. These resistors are sequentially connected in series, wherein one end of the first voltage dividing resistor R1 is connected to the power source and is much larger than the other paths. Piezoresistors R2 to R5, one end of the Nth voltage dividing resistor R5 is connected to the ground.
- the respective ends of the resistors R2 to R5 are sequentially connected to the positive phases of the comparators COMP1, COMP2, COMP3, COMP4, COMP5, respectively.
- the input end of the comparator unit 200 is connected to the output end of the voltage dividing unit 100 for outputting a corresponding control signal to the logic control unit 300 when the voltage changes, controlling the turn-off and conduction of the switch unit 500, thereby controlling the LEDs of the respective circuits. Lights up and goes out.
- the comparator unit 200 includes N comparators, such as COMP1 ⁇ COMP5, which respectively belong to the current path of each LED load.
- the positive phase of each comparator is connected to the negative terminal of the divider resistor of the current path, and the inverting terminal of each comparator is connected to a constant reference voltage VREF.
- the reference voltage VREF can be supplied by other power supply modules with a constant voltage, which satisfies the output of the comparator. Into the range to ensure that the comparator works properly.
- the principle of operation of the comparator unit 200 is as follows.
- the positive phase terminal voltages of each comparator such as VP1, VP2, VP3, VP4
- VREF comparators COMP1, COMP2, COMP3, COMP4 sequentially output a high level
- the high level signal is sent to the logic control unit LOGIC 300, thereby controlling the power MOS tubes M1, M2, M3, M4 in the switch unit 500 to be sequentially turned off.
- the number of lit LED strings is increased sequentially.
- the voltages of the positive phase terminals of the comparators are sequentially decreased until they are smaller than the reference voltage VREF of the comparator, and the comparators COMP1, COMP2, COMP3, COMP4 The low level is sequentially output, and the low level signal is controlled by the logic control unit 300 to control the power MOS tubes M4, M3, M2, and M1 to be turned on in sequence, so that the number of the lit LED strings is sequentially decreased.
- the positive phase VP5 of the comparator COMPN for example, comparator COMP5 of the last Nth current path is grounded, and its output is kept low, so that the power MOS transistor M5 of the path remains conductive, when the MOS transistor MN (N When ⁇ 5) is off, the LED of the path where M5 is lit is lit. If one of the MOS transistors MN (N ⁇ 5) is turned on, the LED of the path where M5 is located does not emit light.
- Fig. 2 is a view showing a preferred configuration of a comparator in the LED illumination driving circuit of the present invention.
- the comparator preferably used in the present invention is composed of a two-stage operational amplifier and an inverter.
- the first stage of the two-stage op amp uses a differential input single-ended output structure, and the output of the op amp is shaped by an inverter into a logic signal output.
- the two-stage amplifier amplifies the difference between the input signal IN+ and the input signal IN-, and the amplified signal is shaped by the inverter into a logic signal output.
- the logic control section 300 is connected to the output terminal of the comparator section 200, which includes a plurality of NOR gates and an inverter for controlling the sequential opening and the sequential turn-off of the switch section 500 during the voltage change.
- Fig. 3 is a view showing a preferred configuration of a logic control portion in the LED illumination driving circuit of the present invention.
- the logic control section 300 includes NOR gates 201 to 204 and inverters 101 to 109. Further, the logic control unit 300 includes one enable terminal El, E2, E3, E4, and E5 in each current path. Each enable terminal outputs a high level or a low level with a voltage change, and after being driven by the power tube driver 1 to 5, the control power MOS tube is turned on or off, respectively, thereby controlling the LED load in the current path to be energized or Power off and extinguish.
- One input of the NOR gate 201 in the first current path is connected to the comparator COPM1 Output, the other input is connected to the inverter in the next current path (ie, the second current path)
- the input of 102 and the output of inverter 101, the output of NOR gate 201 is connected to power transistor driver 1 in the current path (i.e., the first current path).
- One input terminal of the NOR gate 202 in the second current path is connected to the output terminal of the comparator COPM2, and the other input terminal is connected to the input terminal of the inverter 104 in the next current path (ie, the third current path) and the opposite end.
- the output of the phase detector 103, the output of the NOR gate 202 is connected to the first inverter 101 in the current path (ie, the second current path), and the second inverter 102 is connected to the power tube driver in the current path. 2.
- One input terminal of the NOR gate 203 in the third current path is connected to the output terminal of the comparator COPM3, and the other input terminal is connected to the input terminal of the inverter 106 in the next current path (ie, the fourth current path) and the opposite end.
- the output of the NOR gate 203 is connected to the first inverter 103 in the current path (ie, the third current path), and the second inverter 104 is connected to the power tube driver in the current path. 3.
- One input terminal of the NOR gate 204 in the fourth current path is connected to the output terminal of the comparator COPM4, and the other input terminal is connected to the input terminal of the inverter 109 in the next current path (ie, the fifth current path) and the opposite end.
- the output of the NOR gate 204 is connected to the first inverter 105 in the fourth current path, and the second inverter 106 is connected to the power tube in the current path (ie, the fourth current path).
- the logic control portion of the Nth current path (i.e., the fifth current path) includes three inverters 107, 108, and 109.
- the input end of the first inverter 107 is connected to the output end of the comparator COMP5, and the output end thereof is connected to the current path (ie, the fifth current path) via the second inverter 108.
- Power tube driver 5 The input end of the first inverter 107 is connected to the output end of the comparator COMP5, and the output end thereof is connected to the current path (ie, the fifth current path) via the second inverter 108. Power tube driver 5.
- the power driving section 400 is connected to the output of the logic control section 300 for supplying a required gate voltage for turning on and off the power MOSFET.
- the power driving unit 400 includes a plurality of power tube drivers, for example, drivers 1 to 5, which are respectively disposed in the first to fifth current paths.
- the output terminals of the power tube drivers 1 to 5 are connected to the gates of the power MOS transistors (M1 to M5) in the current path for controlling the turn-on and turn-off of the power MOS transistors according to the output signals of the enable terminals of the logic control unit 300.
- the input control terminal of the switch unit 500 is connected to the output of the power drive unit 400 for controlling energization and de-energization of the LED load.
- the switch unit 500 includes a plurality of power MOS tubes.
- M1 to M5 are provided in the first to fifth current paths, respectively.
- the gate of each power MOS transistor is connected to the output of the power transistor driver in the current path, the drain is connected to the LED load in the current path, and the source is connected to the drain of the MOS transistor M6 of the constant current portion 600. pole.
- the power MOS tubes M1 to M5 preferably employ a high voltage power tube whose withstand voltage needs to be greater than the maximum threshold of all LED loads.
- the LED illumination driving circuit of the present invention further includes a constant current portion 600 for supplying a constant current to the driving circuit.
- a constant current section 600 includes voltage dividing resistors Ra and Rb, the error amplifier AMP, MOSM6 and sampling resistor R 3 ⁇ 4.
- one end of the resistor Ra is connected to the power supply voltage (the mains is bridge-rectified half sine wave)
- the other end and one end of the Rb are connected to the positive phase input terminal of the error amplifier AMP
- the other end of the Rb is connected to the reference ground.
- the inverting input terminal of the error amplifier AMP is connected to the source of the MOS transistor M6 and one end of the sampling resistor R 3 ⁇ 4 , and the output terminal of the error amplifier AMP is connected to the gate input terminal of the MOS transistor M6.
- the other end of the sampling resistor R 3 ⁇ 43 ⁇ 4 is connected to the reference ground.
- the drain of the MOS transistor M6 is connected to the switch unit 500 as an output terminal.
- the voltage dividing resistors Ra and Rb sine waves are used to divide the power supply voltage into voltage values suitable for the operation of the error amplifier AMP, and the voltage generated by the voltage division varies sinusoidally with the power supply voltage.
- the error amplifier makes its non-inverting input voltage and the inverting input voltage equal, and the current flowing through the sampling resistor R s can be set to VAMP/R.
- the current flowing through the LED also changes accordingly.
- the current flowing through the LED string can be sinusoidal and half-wave change with the input AC power source, and the effective value is kept constant.
- the effective value of the resistor can be adjusted by the resistor R 3 ⁇ 4 3 ⁇ 4 .
- the power supply voltage is a half sine wave after the mains is bridge-rectified.
- the outputs of the comparators COMP1 to COMP5 are all "0".
- the respective enable terminals E1, E2, E3 of the logic control unit 300, E4, E5 output are all high level "1”
- the control power MOS tubes M1 ⁇ M5 are all turned on, but since the power supply voltage is 0, the threshold voltage of the LED light is not reached. , so the LED light string goes out. As the power supply voltage rises, the LED1 string is first illuminated.
- the positive phase terminal voltage VP1 of COMP1 is first increased to be greater than its inverting terminal reference voltage VREF.
- the comparator COMP1 outputs a high level "1", via the NOR gate 201, the enable terminal in the current path.
- E1 outputs low level "0".
- the control power MOS tube M1 is cut off.
- the power MOS tubes M2, M3, M4, M5 remain open, and the high voltage LED group
- LED1 and LED2 are energized to emit light.
- the current on the LED is set to ground via M2, M6 and R. Its instantaneous current magnitude is:
- VAMP is the positive phase terminal instantaneous voltage of the error amplifier AMP.
- the enable terminal E2 output is "0"
- the power MOS transistor M2 is cut off, the power tube M3, M4,
- M5 remains on, at which time the high voltage LED groups LED1, LED2, and LED3 are illuminated.
- the current on the LED passes through M3, M6 and R3 ⁇ 4 to ground. Its instantaneous current is:
- VAMP is the positive phase terminal instantaneous voltage of the error amplifier AMP.
- the power supply voltage continues to rise, and the enable terminals E3 and E4 of the other current paths sequentially output a low level, and the power MOS transistors M3 and M4 are sequentially turned off, and the LEDs 4 and 5 are sequentially turned on.
- the power supply voltage reaches the maximum value (the peak value of the half sine wave), it starts to fall, and the enable terminals E4, E3, E2, and E1 sequentially output a high level, and the power MOS tubes M4, M3, M2, and M1 are turned on in turn, and are lit.
- the LED light string is sequentially reduced, and so on.
- the enable terminal E5 in the last path maintains the output high level, and the MOS transistor M5 remains in the on state, when the MOS transistor MN (N ⁇ 5) When both are off, the LED of the path where M5 is lit is lit. If the MOS transistor MN (N ⁇ 5) has a turn-on, the LED of the path where M5 is located does not emit light.
- the frequency of the voltage change is faster, it exceeds the recognition time of the human eye, and the whole process is not observed. To the blinking phenomenon. And, with the increase and decrease of the voltage, the power tube M5 is always kept in the on state.
- the voltage converter is not used in the circuit.
- the high-voltage LED group is sequentially turned on, and then sequentially turned off, and the cycle changes. Since the variation frequency is fast enough, greater than the recognition time of the human eye, and the current effective value remains constant during the process, the entire LED dot matrix emits light uniformly and stably.
- Fig. 4 is a view showing a current-voltage simulation waveform in the LED illumination driving circuit of the present invention.
- the voltage is 220V AC and the waveform after full-wave rectification has a peak value of 310V.
- a current flows through the LED, and then the current waveform follows a change of the power supply voltage as a sine half-wave, and the frequency of the current change is 100 Hz. Since the current effective value remains unchanged during the process, Thereby ensuring the uniformity and stability of the LED dot matrix. Because the input current and voltage of the circuit are sinusoidal and the same, the circuit can achieve a better power factor.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EA201690262A EA201690262A1 (ru) | 2013-07-22 | 2014-07-21 | Схема возбуждения осветительного прибора на основе сид |
EP14828676.8A EP3026985A4 (en) | 2013-07-22 | 2014-07-21 | Led lighting drive circuit |
US14/906,493 US9485821B2 (en) | 2013-07-22 | 2014-07-21 | LED lighting drive circuit |
CA2918101A CA2918101A1 (en) | 2013-07-22 | 2014-07-21 | Led lighting drive circuit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CN201310309316.4 | 2013-07-22 | ||
CN201310309316.4A CN104333934B (zh) | 2013-07-22 | 2013-07-22 | Led照明驱动电路 |
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WO2015010580A1 true WO2015010580A1 (zh) | 2015-01-29 |
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PCT/CN2014/082572 WO2015010580A1 (zh) | 2013-07-22 | 2014-07-21 | Led照明驱动电路 |
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US (1) | US9485821B2 (zh) |
EP (1) | EP3026985A4 (zh) |
CN (1) | CN104333934B (zh) |
CA (1) | CA2918101A1 (zh) |
EA (1) | EA201690262A1 (zh) |
WO (1) | WO2015010580A1 (zh) |
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CN104812118B (zh) * | 2015-04-17 | 2017-03-01 | 华南理工大学 | 一种采用交流市电的led照明驱动电路及方法 |
CN105048779B (zh) * | 2015-07-09 | 2018-11-06 | 成都卓创科微电子有限公司 | 一种栅电压自适应快速驱动电路 |
CN105050296B (zh) * | 2015-09-07 | 2017-06-30 | 电子科技大学 | 一种具有高功率因数特性的led驱动电路 |
DE102016122933A1 (de) * | 2016-11-28 | 2018-05-30 | SMR Patents S.à.r.l. | Steuer- und Überwachungsschaltung zum Steuern einer Beleuchtungsanwendung in einem Fahrzeug |
WO2017192513A1 (en) * | 2016-05-02 | 2017-11-09 | Lumileds Llc | Multi-pad, multi-junction led package with tapped linear driver |
CN106658847B (zh) * | 2016-12-23 | 2018-08-14 | 深圳市思乐数据技术有限公司 | 彩票机自助终端及其灯光控制方法 |
US10222405B2 (en) * | 2017-06-14 | 2019-03-05 | Otto P. Fest | Solid state analog meter |
CN110234188A (zh) * | 2019-05-08 | 2019-09-13 | 深圳市富满电子集团股份有限公司 | Led驱动芯片的自动换挡调节电路 |
CN110264968B (zh) * | 2019-05-14 | 2021-11-02 | 昆山龙腾光电股份有限公司 | 信号产生电路 |
CN113597050B (zh) * | 2019-06-06 | 2024-05-28 | 上海路傲电子科技有限公司 | 控制电路、驱动电路、控制方法及照明装置 |
CN112804781A (zh) * | 2019-11-13 | 2021-05-14 | 上海路傲电子科技有限公司 | 控制电路、驱动电路、控制方法及照明装置 |
JP7302495B2 (ja) * | 2020-02-04 | 2023-07-04 | 豊田合成株式会社 | Led駆動装置 |
CN112289253B (zh) * | 2020-06-02 | 2022-02-11 | 深圳市杰理微电子科技有限公司 | Led单元的驱动电路、led单元及显示屏 |
CN113035138A (zh) * | 2021-03-09 | 2021-06-25 | 京东方科技集团股份有限公司 | 驱动电路、显示屏和驱动方法 |
CN112996182B (zh) * | 2021-03-11 | 2023-03-10 | 广州彩熠灯光股份有限公司 | 一种光源驱动电路 |
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- 2014-07-21 EA EA201690262A patent/EA201690262A1/ru unknown
- 2014-07-21 US US14/906,493 patent/US9485821B2/en not_active Expired - Fee Related
- 2014-07-21 WO PCT/CN2014/082572 patent/WO2015010580A1/zh active Application Filing
- 2014-07-21 CA CA2918101A patent/CA2918101A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
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CN104333934B (zh) | 2016-12-28 |
US9485821B2 (en) | 2016-11-01 |
EP3026985A4 (en) | 2017-03-29 |
EP3026985A1 (en) | 2016-06-01 |
CN104333934A (zh) | 2015-02-04 |
CA2918101A1 (en) | 2015-01-29 |
US20160165689A1 (en) | 2016-06-09 |
EA201690262A1 (ru) | 2016-05-31 |
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