基于Matlab设计的软开关型APFC电路

将一种改进型软开关电路与Boost电路相结合,组成一种软开关型有源功率因数校正(APFC)电路。软开关型APFC电路的主电路是将输入端的交流变换为直流,并在软开关条件下实现功率因数校正。基于Boost型功率因数校正电路,利用改进型ZVT(Zero Voltage Transition)实现软开关。电路由基本Boost电路和辅助谐振网络2部分组成。电路中的主开关管是零电压开通和零电压关断的,辅助开关管是零电流开通和零电压关断的。在软开关型APFC电路中,选用平均电流控制方式。给出了电路中主要元器件参数(升压电感、滤波电容、辅助电感、辅助电容、采样电阻及输出负载)的选取方式,仿真结果表明,功率因数可达0.9976。

Soft-switching APFC circuit based on Matlab

A soft-switching type APFC(Active Power Factor Correction)circuit is designed by com-bining improved soft-switching circuit with Boost circuit.Its main circuit converts input AC into DC and corrects the power factor under soft-switching condition.The Boost-based APFC circuit implements the soft-switching using improved ZVT(Zero Voltage Transition)circuit.The circuit is com-posed of the basic Boost circuit and the resonant network.The main on-off component implements real ZVT mode while the assistant on-off component implements zero current turn-on and zero voltage turn-off.The average current control mode is adopted.The method of selecting main component parameters is provided,such as the voltage-rising inductor,the filtering capacitor,the assistant inductor,the assistant capacitor,the sampling resistor and the output load.Simulation results show that the power factor is 0.997 6.