A high power factor ZCS-PWM transformer-isolated voltage-double boost rectifier

This paper analyses and designs a zero-current-switching single-phase high power factor transformer-isolated voltage-double boost rectifier. The proposed rectifier combines the conventional pulse-width-modulation technique, soft commutation technique and instantaneous average line current control to promote the circuit performance. Comparison with conventional transformer-isolated boost rectifier, the proposed rectifier own double voltage function at output port without additional voltage and current stresses on main switches. A zero-current-switching auxiliary circuit is configured in the presented rectifier to provide the soft-switching function on main switches and auxiliary switches and improve the problem of switching losses and EMI. In the control strategy, the proposed circuit uses the average current control mode to synthesize a stable sine-wave input current with low harmonics. A prototype has been implemented in laboratory to verify circuit theory.