COMPARATIVE STUDY OF SOFT SWITCHING METHODS USED IN DC-DC CONVERTERS

Year 2017, Volume: 13 Issue: 1, 1 - 22, 28.04.2017

Ali Saygun Ersoy Beşer , Murat Ünlü

Abstract

High frequency switched-mode DC-DC converters are
widely used in industry such as battery charging, renewable energy, fuel-cell,
power factor correction, LED lighting applications,  due to their low response time, easy controlling
and high power density. However, at high switching frequency, switching losses,
electromagnetic interference (EMI) and lower efficiency become substantial
problem. These problems must be eliminated or reduced by using additional
passive and active snubber cells in order to operate the converter with soft
switching (SS) instead of hard switching (HS). In this paper, properties of
soft switching methods named as zero voltage transition (ZVT), zero current
transition (ZCT), and zero voltage zero current transition (ZVZCT) developed by
combining the ZVT and ZCT, zero voltage switching (ZVS) and zero current
switching (ZCS) are studied and discussed, simulations of soft switching DC to
DC boost converters including these methods are accomplished for 500W and 1kW
power at switching frequency of 100 kHz.

Keywords

Switched-mode DC-DC Converters, Hard Switching (HS), Soft Switching (SS), Zero Current Switching (ZCS), Zero Voltage Switching (ZVS), Zero Voltage Transition (ZVT), Zero Current Transition (ZCT)

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