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Passive snubber energy recovery for a GTO thyristor inverter bridge leg

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2 Author(s)
Williams, B.W. ; Dept. of Comput. & Electr. Eng., Heriot-Watt Univ., Edinburgh, UK ; Finney, S.J.

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

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:47 ,  Issue: 1 )

Date of Publication:

Feb 2000

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