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:
Jun. 10, 1997
Filed:
Apr. 26, 1996
Katsuhisa Kato, Saitama-ken, JP;
Toshihiko Onozawa, Ibaraki-ken, JP;
Tatsuya Murofushi, Shizuoka-ken, JP;
Toshikazu Matsuda, Shizuoka-ken, JP;
Sony/Tektronix Corporation, Tokyo, JP;
Abstract
A power control apparatus for protecting an electrical circuit from excessive current and in particular for protecting it from a large and fast transition pulse caused by a rapid current polarity transition. At least two switching devices are coupled in series or in parallel between a power supply and a load. A gate signal is generated to change the switching devices from conductive state to nonconducting state in response to detection of an excessive current state. The gate signal is delayed by a predetermined period of time to change the switching devices into the nonconducting state after all of the switching devices are saturated so that the rapid current polarity transition is eliminated.