摘要
针对LED驱动电源功率因数和恒流问题，介绍了以采用UC3845的反激式变换器为主电路，改进了传统的填谷式无源功率因数校正电路，分析了电路的恒流控制原理，完成了主要电路元件参数的计算，并针对恒流特性和PF值进行测试。测试结果表明，该电路结构简单，功率因数高，恒流精度高，满足对LED照明驱动的要求。
For LED driver＇s power factor and constant current,the flyback convertor on UC3845 is proposed and traditional valley fill circuit is improved in the constant current is analyzed and the element parameters of character and PF value are test at the experiment. The experimen advantage of simple construct,high power factor,high constant which can meet the requirements of driving LED. paper. Then the realized principle of the circuit are set. Constant current tal results show that the circuit has the current precision and good stability,
出处
《电源技术应用》
2013年第8期27-31,共5页
Power Supply Technologles and Applications
