High‐frequency single‐switch PFC with frequency‐modulation controlled class‐E2 converter

Abstract

Abstract This paper presents a single‐switch zero‐voltage switching (ZVS) power‐factor correction converter based on the class‐E2 converter at 1 MHz switching frequency. A design method for ensuring the ZVS for the entire line‐voltage period is proposed. By visualising the ZVS region in the parameter space, circuit parameters can be easily obtained to achieve the ZVS for the entire line‐voltage period. Additionally, a closed‐loop controller is applied for achieving a high power factor, low total harmonic distortion of the input current and output voltage regulation. The experimental circuit achieved the ZVS in the entire line‐voltage period against load variations. As a result, the implemented converter achieved the same level of power‐conversion efficiency as the 100‐kHz power‐factor correction converters and a high power factor with low total harmonic distortion, which denoted the effectiveness of the proposed design method.

Keywords

• Power electronics, supply and supervisory circuits
• Voltage control
• Current control
• Control of electric power systems
• Power convertors and power supplies to apparatus