一种Boost型APFC控制芯片的设计与实现

为抑制谐波对公共电网的污染、提高电能利用率,针对中小功率电器功率因数校正的需要,设计了一种基于Boost型拓扑结构的有源功率因数校正控制芯片.该芯片采用临界导通模式控制,加入总谐波失真优化电路,解决了输入电流过零处的交越失真问题.设计了带双模式过压检测的电压反馈电路,实现了对整个系统的快速瞬态响应和异常保护.整个电路采用CSMC 0.5 μm BCD工艺设计,芯片面积仅1.36 mm2.基于该芯片,设计了80 W功率因数校正电路.测试结果表明:在220 V交流输入、满负载条件下,电流THD(总谐波失真)为3.1%,功率因数达0.997,效率为96.8%,表明该芯片很好地实现了功率因数校正功能. 

Design and Implementation of Boost Type Active Power Factor Correction Controller IC

A boost type active power factor correction controller based on the critical mode control technology was proposed to restrain harmonic currents and improve the efficiency of electrical power. A total harmonic distortion optimizer circuit was specially integrated to solve the crossover distortion problem that input current is zero. And a voltage feedback circuit with two over-voltage detection modes was designed to achieve fast instantaneous response and unexpected protection. A chip, with an area of only 1.36 mm2, was fabricated by the CSMC 0.5 μm BCD process. A 80 W APFC circuit was constituted based on the chip. The test results under a full load show that the measured power factor is 0.997, the total harmonic distortion of input current is 3.1% and the efficiency is 96.8% to prove that the chip achieves the function of power factor correction.