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New Lossless Turn-On and Turn-Off (Snubber) Networks for Inverters, Including Circuits for Blocking Voltage Limitation

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4 Author(s)
Zach, Franz C. ; University of Technology, Gusshausstrasse 27, Inst. 359.5, A-1040 Vienna, Austria. ; Kaiser, Karl H. ; Kolar, J.W. ; Haselsteiner, Franz J.

Transistorized pulsewidth modulated (PWM) inverters require careful dimensioning of turn-on and turn-off circuits in order to minimize switching loss in the power transistors. New lossless circuits are described. In particular the turn-off circuits show a highly reduced part count compared to circuits known from the literature. The turn-on circuits apply energy recovery. Furthermore, due to a special circuit the voltage across the power transistor is strictly limited. This is important especially due to the usually low voltage blocking capability of high-current power transistors.

Published in:

Power Electronics, IEEE Transactions on  (Volume:PE-1 ,  Issue: 2 )