Surge voltage suppression by the secondary side short circuit for the full bridge type bidirectional DC/DC converter

Abstract

The full-bridge type bidirectional DC/DC converter is considered to be a promising topology for large capacity DC/DC conversion. Bidirectional DC/DC converter have two operation modes : Current-Mode and Voltage-Mode. It is well known that large surge voltage is generated at switching devices with current mode operation. The main factor of surge voltage is the leakage inductance of the transformer. The purpose of the study is the suppression of the surge voltage caused by the leakage inductance. In this paper we propose a novel control strategy which reduce the surge voltage of switching devices at current mode operation. Finally, experimental results of laboratory model which applied the new control strategy are presented, in which the reduction of surge voltage is realized.