LED照明用恒流电源变换器电路设计

摘要

所设计电路以芯片UC3842为核心，恒流控制采用脉宽控制（PWM）方式，实现150mA--350mA可调恒流输出，为5—10个LED供电。电路还设有输出过压恒压保护电路及光控电路，实现输出过压时电压恒定在36V，同时还实现光控照明。%This circuit is taken UC3842 as a core. Constant current control adopted the way of pulse width control（ PWM）, which made 150mA--350mA adjustable constant current output come true and provided power for five to ten LED . What＇s more, when being overvoltage output, the current could protect itself and has light control circuit, which make overvohage output 36V and light control come true.