Full-wave boost rectifier by ZCS-PWM control with reduced conduction losses

A new single-phase full-wave boost rectifier (FWBR) with high power factor correction implemented by zero-current-switching pulse-width-modulation (ZCS-PWM) is presented. The presented FWBR is configured by two resonant cells and without the front-end bridge rectifier for pre-regulating the input current to achieve high power factor correction. The two resonant cells form the ZCS. With the ZCS-PWM control, the FWBR dissipates only two conduction losses of the power switches more efficiently than the conventional rectifier. Seven transition states for describing the behavior of the ZCS-PWM FWBR during one switching cycle of the positive-half period of the line is described. A mathematical model for describing each state is built. With this PWM-switch model, a small-signal model is established for system analysis. The control strategy and the design consideration for implementing the system are also explored. A design example of a 600-W ZCS-PWM FWBR is implemented and examined, which provides high power efficiency of 95% and high power factor of nearly 0.95