开关电源的有源功率因数校正电路设计

Circuit design of the active power factor corrector in the switching mode power supply

有源功率因数校正可减少用电设备对电网的谐波污染,提高电器设备输入端的功率因数。详细分析了有源功率因数校正APFC(active power factor corrector)原理,采用平均电流控制模式控制原理,设计了基于UC3854BN芯片的一种有源功率因数校正电路方案,着重分析了电路主要参数的选择和设计。实践证明,采用APFC后,大大减小了输入电流的谐波分量,实现了功率因数校正。

APFC （active power factor corrector）can reduce harmonic and improve the input power factor of the electric appliance equipment.The principle of APFC is discussed. UC3854BN chip design based on an active power factor correction circuit program, focused on analysis of the main parameters of the circuit selection and design. Practice has proved that the use of APFC, greatly reduces the input current harmonics, power factor correction.