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Title:
GATE POWER SOURCE FOR SELF-ARC EXTINGUISHING ELEMENT
Document Type and Number:
Japanese Patent JPH05316717
Kind Code:
A
Abstract:

PURPOSE: To reduce loss of a gate power source for a self-arc extinguishing element by reusing a voltage of a snubber capacitor charged by dividing a voltage between an anode and a cathode of a gate turn-off thyristor (GTO) for a gate power source of the GTO.

CONSTITUTION: A voltage between an anode and a cathode of a GTO 31 is divided by resistors 58, 59 to initially charge a capacitor 60 for a power source. Then, an output voltage of the GTO 31 is divided to charge first, second snubber capacitors 31C, 52 to constitute a snubber circuit. A discharging current of the capacitor 52 is supplied to a primary side 53A of a transistor 53 through a switching element 54 to be closed in synchronization with turn-on of the GTO 31. An output of a secondary side 53B is rectified by diodes 55, 57 to charge a capacitor 60 for a power source. The GTO 31 is turned ON or OFF by a signal from an output terminal G of a DC/DC converter 61. Thus, charge of a snubber capacitor is used to reduce loss of an apparatus.


Inventors:
TSURUTA YUKINORI
Application Number:
JP11942292A
Publication Date:
November 26, 1993
Filing Date:
May 13, 1992
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
H02M1/06; H02M3/28; (IPC1-7): H02M1/06; H02M3/28
Attorney, Agent or Firm:
Noriyuki Noriyuki



 
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