H - Electricity – 03 – K
Patent
H - Electricity
03
K
323/6
H03K 17/72 (2006.01) H03K 17/08 (2006.01) H03K 17/0814 (2006.01) H03K 17/732 (2006.01)
Patent
CA 2025214
ABSTRACT An electrical circuit for the switch-off relief of a controllable semiconductor switch. Electrical circuits are known for the switch-off relief of controllable semiconductor switches, in particular disconnectable thyristors or gate turn-off switches arranged in parallel with a series arrangement of a storage capacitor and a diode. In these circuits a discharge switch is driven by a control arrangement and can close a discharge-current circuit connecting the capacitor to the primary winding of a transformer so that energy stored in the capacitor can be tapped at the secondary winding of the transformer. In the present invention the control circuit is connected to the input side of the diode and constructed in such a way that the discharge switch is driven depending upon the polarity of the voltage across the diode. In addition, the transformer is preferably driven as a blocking converter.
Blake Cassels & Graydon Llp
Hofgraff Hans G.
Transtechnik G.m.b.h.
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