Implementation of a single-stage quasi Z-source AC-DC Power Factor Correction converter

The implementation of a single-stage AC-DC Power Factor Correction (PFC) converter which features high efficiency, unity power factor (PF), and low Total Harmonic Distortion (THD) under wide range input voltage is presented in this paper. By utilizing a common topology, namely quasi z-source converter, the proposed PFC converter can well eliminate voltage spike on switches without dissipative components usage. As a result, low voltage rating Mosfets with low on-resistance R_ds(on) can be used to achieve high efficiency. In addition, Continuous Conduction Mode (CCM) operation associated with the variable duty control scheme to regulate the output voltage is also applied to get high PF, low harmonic components in the line current. In this study, the principle of operation, circuit analysis, and control method of the proposed PFC converter are provided. Additionally, the design consideration are given and also verified by a laboratory prototype with 180 to 240 V AC input, 380 V/1 kW output, and 50 kHz switching frequency. Consequently, this topology is well suitable for high power, wide input voltage range applications where a unity PF, low THD, and high efficiency are required.