A soft switcher optimized for IGBTs in PWM topologies

Gregory Ensky, David Sidi, Sam Ben-Yaakov

Research output: Contribution to journalArticlepeer-review


A novel soft switching scheme optimal for IGBTs is described, and investigated theoretically and experimentally. The proposed soft switcher applies an auxiliary IGBT switch which is operated for a short time interval during the turn-off commutation of the main IGBT. The main advantage of the proposed switcher is ZCS of the main and auxiliary IGBTs during both turn-on and turn-off, while all other power devices are also soft switched. The proposed soft switcher can be implemented in various types of PWM topologies. The experimental Boost converter was run at a switching frequency of 100 kHz to power levels of 1 kW. The efficiency was measured to be about 95% at a duty cycle of 0.45 and an output voltage of 300 V.

Original languageEnglish
Pages (from-to)703-716
Number of pages14
JournalInternational Journal of Electronics
Issue number5
StatePublished - 1 Jan 1997


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