Unequal Input Voltages Distribution Between the Serial Connected Halfbridges

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Unequal Input Voltages Distribution Between the Serial Connected Halfbridges

Radovan Ovcarcik, Pavol Spanik, Robert Sul, Filippo Chimento

DOI:

Abstract

This paper describes a topology of DC-DC converter consisting in two serial connected half-bridges. Secondary circuit is realized like a conventional full-wave rectifier. The main advantage of this topology is the possibility of dividing the input voltage between the half-bridges. The converter is controlled using the phase-shift modulation, which allows a ZVS
operation mode. The voltage unbalance between the inputs causes an important problem of the presented topology. It is necessary to avoid it by the control algorithm, which is described in the text. The practical results show a zero voltage switching technique and the limits of the chosen topology and of the control.