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:
Jan. 31, 2012
Filed:
Mar. 18, 2011
Kazuhiko Itakura, Kawasaki, JP;
Kazuhiko Itakura, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A power supply control circuit detects a reference voltage VD corresponding to an intermediate voltage of a Hi Side FET and a Lo Side FET, when a short-circuit fault of the Lo Side FET is generated, and compares a threshold value VIN−VrefH and the reference voltage VD using a comparator COMP. The power supply control circuit determines that the short-circuit fault is generated, when the reference voltage VD is less than the threshold value VIN−VrefH and a switching control signal (HiDr) is in an ON state. Likewise, the power supply control circuit detects the reference voltage VD of the Hi Side FET and the Lo Side FET, when a short-circuit fault of the Hi Side FET is generated, and compares a threshold value VrefL and the reference voltage VD using the comparator COMP. The power supply control circuit determines that the short-circuit fault is generated, when the reference voltage VD is more than the threshold value VrefL and a switching control signal (LoDr) is in an ON state.