Inverter apparatus comprising switching elements

Details Inverter apparatus comprising switching elements Inverter apparatus comprising switching elements

2004-07-23

2009-08-04

Ullah, Akm E (Department: 2838)

Electric power conversion systems

Current conversion

Using semiconductor-type converter

C363S017000, C363S040000, C363S055000, C363S056020

Reexamination Certificate

active

07570502

ABSTRACT:
A problem to be solved by the present invention is to eliminate variation in potential in a turn-off time period of each GTO element, and to stabilize a gate drawing current by surely performing the turn-off of the GTO element. In an inverter apparatus having a three-phase inverter configured to include paired GTO elements an inverter control portion has a simultaneous switching prevention function of delaying a turn-on operation of each of the GTO elements which correspond to phases other than a phase corresponding to an optional one of the GTO elements and also correspond to an electrode opposite to an electrode corresponding to the optional one of the GTO elements by a predetermined time in a case where a turn-on command signal for turning on each of the GTO elements is generated within a predetermined time period since the turn-off of the optional one of the GTO elements.

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Decision of Refusal in corresponding Japanese Patent Application 2003-279312, dated Sep. 8, 2008.
Japanese Office Action dated Jan. 8, 2009 by Japanese Patent Office for counterpart Japanese Application No. 2003-279312.
European Search Report dated May 8, 2009 for counterpart European Application No. 04748104.9 - 1242, 4 pages.
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