THE APPLICATION OF OUTPUT FILTER WITH VARIABLE INDUCTANCE IN ZERO-CURRENT-SWITCH QUASI-RESONANT CONVERTER

Abstract

Various problems of quasi-resonant half-wave zero-current-switch (ZCS) buck converter operation are observed in this paper. The application of an output filter with variable inductance depending on load current is proposed. This allows improvement of voltage regulation in a wide range (more than 50%) of load currents. In this paper, a variant of output filter choke construction is suggested, and also the main elements of the original method for defining its inductance function applying a linearized small-signal model of ZCS converter. This method allows improving density and dynamic characteristics of such a converter. This is confirmed by experimental results quoted in the paper.