Two-channel LED driver based on resonant switched capacitor
A LED driver and switched capacitor technology, which is applied in the field of two-channel LED drivers, can solve the problems of affecting current sharing accuracy and increasing circuit complexity, and achieve the effects of simple circuit, avoiding stress requirements, and reducing switching loss
Active Publication Date: 2022-03-22
HARBIN INST OF TECH
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Problems solved by technology
[0006] Aiming at the problem that in the current passive current sharing technology for LED driving, the complexity of the circuit increases with the increase of LED branches, which affects the accuracy of current sharing, the present invention provides a two-channel LED driver based on resonant switched capacitors
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[0042] Specific implementation mode 1. Combination figure 1 As shown, the present invention provides a two-channel LED driver based on a resonant switched capacitor, which is characterized in that it includes two half-bridge circuits, an input capacitor C in1 , input capacitance C in2 , switched capacitor C r , snubber inductance Lr , Diode D 1 , Diode D 2 , output capacitance C 01 and output capacitor C 02 ,
[0043] The two half-bridge circuits constitute a stacked bridge with a power supply V in connection, one of the half-bridge circuits parallels the input capacitor C in1 , the other half-bridge circuit parallels the input capacitor C in2 ;
[0044] The connecting point lead-out lines of the two bridge arms of the one half-bridge circuit are connected to the switched capacitor C r One end of the switched capacitor C r The other end of the connection snubber inductor L r One end of the snubber inductance L r The other end of the diode is connected to D 1 the ...
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A two-channel LED driver based on a resonant switched capacitor belongs to the technical field of LED driving. The invention aims at the problem that in the current passive current sharing technology driven by LEDs, the complexity of the circuit increases with the increase of LED branches, which affects the accuracy of current sharing. Including: a half-bridge circuit, the connection point of the two bridge arms leads to the switch capacitor C r One end of the switched capacitor C r The other end of the connection snubber inductor L r One end of the snubber inductance L r The other end of the diode is connected to D 1 the cathode of the diode D while connected 2 The anode of the other half-bridge circuit; the connection point of the two bridge arms of the other half-bridge circuit is grounded; the diode D 1 Connect the LED to be driven all the way between the anode and the ground point; diode D 2 Another LED to be driven is connected between the cathode and the ground point; the LED to be driven is connected to the output capacitor C 01 Parallel connection, the other LED to be driven and the output capacitor C 02 in parallel. The invention realizes two branch LED current equalization based on the principle of capacitive charge balance, has simple circuit, small volume, and does not need additional control circuit.
Description
technical field [0001] The invention relates to a two-channel LED driver based on a resonant switched capacitor, and belongs to the technical field of LED driving. Background technique [0002] LED has the advantages of small size, high power density, long service life, no pollution to the environment, pure luminous light color, high work efficiency, etc. Compared with traditional incandescent lamps and other light sources, the luminous efficacy is higher. When emitting light with the same brightness, the power consumption of incandescent lamps is several times that of LEDs. Therefore, LEDs have been widely used in many fields such as street lighting, indoor lighting, and LCD backlighting. [0003] With the continuous maturity of LED packaging technology, LED has shown a tendency to replace fluorescent lighting. Most LED lighting occasions use the combination of LED lights in series and parallel. According to the characteristics of LED constant current drive, LED drive curr...
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IPC IPC(8): H05B45/30H05B45/345
CPCY02B20/30
Inventor 张相军徐殿国管乐诗孙磊王懿杰蔡虹耶韩寿恒刘浩
Owner HARBIN INST OF TECH