Passive snubber energy recovery for a GTO thyristor inverter bridge leg

Barry W. Williams, Stephen J. Finney

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


This paper presents a turn-on and turn-off passive energy recovery snubber circuit suitable for high-voltage high-power gate-turn-off thyristor inverter bridge configurations. The circuit recovers not only inductive turn-on and capacitive turn-off snubber energies, but also energies associated with freewheel diode reverse recovery. Energy is transferred back to the dc supply via a high-frequency transformer, that is fully reset. A method for reducing the transformer secondary diode voltage stress is presented. The performance of the circuit is supported by PSpice simulation, mathematical analysis, and practical results.

Original languageEnglish
Pages (from-to)2-8
Number of pages7
JournalIEEE Transactions on Industrial Electronics
Issue number1
Publication statusPublished - Feb 2000


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