一种大功率led驱动电路

Large-power LED driving circuit

Abstract

一种大功率LED驱动电路,包括输入电路和电源调整电路,输入电路包括依次连接的可熔断电阻、整流二极管和∏型滤波电路,∏型滤波电路的输出连接电源调整电路的输入端,电源调整电路包括LNK306P集成电源芯片,其中LNK306P集成电源芯片的D脚连接∏型滤波电路的输出端,LNK306P集成电源芯片的S脚连接并联的储能回路和驱动回路,驱动回路包括依次连接限流保护电阻,稳压电路和输出滤波电路,输出滤波电路的输出连接LED两端,LNK306P集成电源芯片的FB脚连接反馈电路。采用上述技术方案,电路结构简单,使用元件较少,成本较低,且电流输出稳定,性能可靠。
Disclosed is a large-power LED driving circuit. The large-power LED driving circuit comprises an input circuit and a power supply adjusting circuit. The input circuit comprises a fusible resistor, a rectifier diode and an n-type filter circuit which are successively connected. The output of the n-type filter circuit is connected with the input end of the power supply adjusting circuit, the power supply adjusting circuit comprises an LNK306P integrated power chip, the D pin of the LNK306P integrated power chip is connected with the output end of the n-type filter circuit, the S pin of the LNK306P integrated power chip is connected with an energy storage loop and a driving loop which are connected in parallel, the driving loop comprises a current-limiting protective resistor, a voltage-stabilizing circuit and an output filer circuit which are successively connected, the output of the output filter circuit is connected with the two ends of an LED, and the FB pin of the LNK306P integrated power chip is connected with a feedback circuit. By adopting the technical scheme, the circuit structure is simple, fewer components are used, the cost is quite low, the current output is stable, and the performance is reliable.

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    CN-104159369-ANovember 19, 2014姬志刚High-power LED drive circuit