Zero-voltage switching of high-gain boost converter

Abstract

A zero-voltage transition network is proposed for a high-gain boost converter. The high-gain is realized by an interleaved boost converter with charge-pump on the load side. An auxiliary zero-voltage transition network; comprising a switch; an inductor and three diodes; is proposed to realize zero voltage turn-ON of the main switches. The resonating inductor of the auxiliary circuit creates resonance with the parasitic capacitance of the main switches thereby ensuring soft turn-ON of the main switches. Unlike resonant and quasi-resonant soft-switched converters; the proposed converter can operate at fixed frequency with pulse width modulated control because the auxiliary circuit operates only for a short duration. A12 to 48 V; 100 W prototype circuit; operating at a frequency of 50 kHz has been developed to verify the zero-voltage turn-ON of the main switches and zero current turn-OFF of the main diodes.