An improvement technique for the efficiency of high-frequency switch-mode rectifiers

A new technique for improving the efficiency of single-phase high-frequency switch-mode boost rectifiers is proposed. This rectifier includes an addit ional boost converter that follows the main high-frequency switching device . The additional converter, which is controlled at lower frequencies, bypas ses almost all the current in the main switch and the high frequency switch ing loss is greatly reduced accordingly. Both snitching devices are control led by a simple method; each controller consists of a one-shot multivibrato r, a comparator and an AND gate, and the maximum switching frequency can be limited without any clock generator The rectifier works cooperatively in h igh efficiency and acts as though it were a conventional high-frequency sni tch-mode rectifier with one snitching device. The proposed method is verifi ed by experiment. This paper describes the rectifier configuration and desi gn, and discusses the steady-state performance concerning the switching los s reduction and efficiency improvement, Transient performance is also inclu ded.