Design of bridgeless Cuk PFC converter based on one-cycle control

Abstract

For the power factor correction converter circuit structure contains low-frequency rectifier bridge causing the problem of low efficiency, Boost PFC converter can only boost the pressure but can not step down，the proposed bridgeless Cuk PFC converter can convert high voltage to low voltage and increase converter power factor. Aiming at the problem that the converter′s ability to suppress the input voltage is poor and the dynamic response speed is slow, a single-cycle control method is proposed to improve the converter′s ability to suppress the input disturbance and the dynamic response speed. This paper introduces the derivation of the control equation for the single-cycle control of the bridgeless Cuk PFC converter and the design of the control circuit. Using MATLAB/Simulink to simulate the operation of the converter, the results show that the single-cycle control method of the bridgeless Cuk PFC converter can achieve good power factor correction, reduce the loss of the converter, and achieve good power supply interference suppression.

Keywords

• bridgeless Cuk converter
• one-cycle control; power factor; total harmonic distortion