Modeling and control of soft‐switching mode rectifiers with power factor correction

Abstract

The small‐signal modeling and quantitative controller design of a soft‐switching mode rectifier (SSMR) is presented in this paper. First, a single‐phase boost‐type SSMR is formed from the traditional boost‐type switching mode rectifier (SMR) with auxiliary resonant branch to achieve zero‐voltage‐transition (ZVT) soft switching for the main and auxiliary switches. For the current‐controlled pulse width modulation (PWM) scheme, the small signal model of the current control loop is obtained using a statespace averaging method and the parameters of the controller are found based on a frequency response approach. As for the voltage control loop design, the dynamic model of the proposed SSMR is first derived using averaging method for two‐time‐scale (AMTTS) and averaged power method. Then, a quantitative procedure is proposed to find the parameters of the voltage controller according to the prescribed control performance. The accuracy of the derived SSMR dynamic model and the effectiveness of the proposed controller are demonstrated by some simulation and experimental results.