基于L6561的电流准连续模式APFC电源设计

Design of APFC Circuit Operated in Critical Current Mode Based on L6561

传统AC/DC变换器往往具有电流谐波高、网络功率因数低等缺点。文中详细分析了电感电流准连续模式的有源功率因数预校正电路的工作原理。采用控制芯片L6561制作了一台宽电压输入(85VAC～265VAC)、输出功率为250W的APFC电源。实验结果表明该电源系统的功率因数提高到0.98以上,总谐波含量低于5%。

There are many disadvantages for the conventional AC/DC convert, such as higher current harmonic and lower power factor. The principle of active power factor correction circuit operated in critical inductor current mode is analyzed in this paper in detail. A (250 W) power supply which can carry out wide voltage input based on control chip L6561 is built. The experimental results verify that the power supply can make the power factor reach over (0.98), and make total harmonic distortion reach lower then 5%.