【摘要】 半无桥双Boost功率因数校正（PFC）电路能够获得更高变换效率，同时不增大共模噪声，但输入交流端的返回电流在引入的二极管上产生额外的损耗，降低了电路的变换效率。研究用MOS管替代二极管，其导通时具有极低阻抗短路与其并联的MOS管（或其体二极管）和电感器支路，返回电流绝大部分流经MOS管，从而降低导通损耗，提高变换效率；同时MOS管及其体二极管为共模噪声提供低阻抗通路，共模噪声水平未发生改变。给出了电路工作过程和设计准则，并用电路仿真验证了分析的正确性。最后，研制出1.5 kW原理样机，验证了该电路能够进一步提高变换效率。更多还原

【Abstract】 The semi-bridgeless dual Boost power factor correction(PFC)circuit can obtain higher conversion efficiency without increasing common mode noise,but the return current of the input AC terminal produces additional losses on the introduced diodes,which reduces the conversion efficiency. The replacement of diodes with MOS transistors was investigated. The MOS transistor was with very low impedance when turned on to short-circuit the MOS transister(or its body diode)and the inductor branch in parallel. Most of the return current was flowed through the introduced MOS transistor,the conduction loss was reduced and the conversion efficiency was improved. At the same time,a low impedance path was provided for the common mode noise through the MOS transistor and its body diode,and the commonmode noise level was not changed. The working process and design criteria of the circuit were given,and the correctness of the analysis was verified by circuit simulation. Finally,a 1.5kW principle prototype was developed,in which it was verified that the circuit can further improve the conversion efficiency.更多还原