Variable Turn Ratio Current-Source Charge Pump Power Factor Correction Converter With High Power Factor and Wide Input Voltage Range

Power factor correction (PFC) is widely used in ac-dc converters to improve power quality. The current-source charge pump (CS-CP) PFC converter has the advantages of simple structure, easy control, and low cost, but it can only obtain a high power factor (PF) over a narrow input range. The operation principle of the CS-CP PFC converter and the input voltage range are analyzed in this article. In order to obtain a high PF over a wide input voltage range, in this article, a variable turn ratio CS-CP PFC converter is proposed. By adjusting the turn ratio according to the variation of the input voltage, the proposed converter can obtain a high PF over a wide input voltage range, reduce the voltage stress of the bus capacitor, and solve the problem of insufficient voltage gain at low input voltage. The operating modes and the wide input voltage range of the proposed converter are analyzed, and the relevant parameters are given. A 40-W experimental prototype operating with the input voltage range of 100-242 Vac is built to verify the theoretical analysis. The proposed converter obtains the PF of 0.946-0.991 and its total harmonic distortion of current can satisfy the IEC 61000-3-2-2020 Class-C Standard in the whole input voltage.