Zero-Voltage Switching Postregulation Scheme for Multioutput Forward Converter With Synchronous Switches

A new multioutput forward converter is proposed. It consists of four synchronous switches in the secondary side for two outputs with the same ground. The primary switches control the main output voltage, and the synchronous switches in the transformer secondary side control the auxiliary output voltage. The main advantages of the proposed converter are that the secondary regulation switch for auxiliary output can achieve the zero-voltage switching at the entire load conditions and the secondary rectified voltage is a three-level waveform, which can reduce the output filter. The operational principle, analysis, and design considerations of the proposed converter are presented in this paper. The validity of this study is confirmed by the experimental results from a dual-output (12 V-18.3 A and 5 V-6 A) prototype for personal computer power supply.