A novel self-driven current-doubler-rectifier three-level converter with integrated magnetics

Abstract

In this paper, a novel three-level converter with an integrated magnetic self-driven current-doubler-rectifier (CDR) is proposed. The proposed converter can reduce the current ripple of filter inductors, then split the main transformer into two transformers, and then replace the filter inductors with excitations, at last integrated these two transformers into one core. Compared to traditional ZVS CDR TL-HB converter, the proposed converter have several advantages, the current ripple of filter inductors is smaller, the windings of main transformer can be directly used to drive synchronous rectifiers, and the problem of poor clamped diode reliability in traditional ZVS CDR TL-HB converter is avoided. This paper presents the principle of the converter, discussed in detail the main switches to realize ZVS range and self-driven for SR. A 28V/100A prototype is built in lab to verify the theoretical analysis.