The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 15, 1994
Filed:
Nov. 09, 1992
Tadashi Miyasaka, Nagano, JP;
Fuji Electric Co., Ltd., Kawasaki, JP;
Abstract
In a reverse-bias control circuit for a voltage-driven switching element which turns on upon receiving a forward-bias voltage and turns off upon receiving a reverse-bias voltage, a step-down circuit is included which serves for stepping down a reverse-bias voltage after a time delay which is substantially equal to the turn-off delay of the voltage-driven switching element. The control circuit further includes a recovery circuit for stopping operation of the step-down circuit after a delay which is substantially equal to the total turn-off time of the voltage-driven switching element. The reverse-bias control circuit serves to reduce the reverse-bias voltage, thereby blocking surge-voltage disturbances, without increasing the turn-off delay time.