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:
Oct. 01, 2013
Filed:
Feb. 04, 2011
Kazumi Nagasawa, Kosai, JP;
Kaoru Kurita, Kosai, JP;
Masashi Nakayama, Makinohara, JP;
Ichiro Toyama, Makinohara, JP;
Mitsuaki Maeda, Makinohara, JP;
Shigemi Ishima, Makinohara, JP;
Kazumi Nagasawa, Kosai, JP;
Kaoru Kurita, Kosai, JP;
Masashi Nakayama, Makinohara, JP;
Ichiro Toyama, Makinohara, JP;
Mitsuaki Maeda, Makinohara, JP;
Shigemi Ishima, Makinohara, JP;
Yazaki Corporation, Tokyo, JP;
Abstract
Provided are an overcurrent protection device and an overcurrent protection system which can provide time differences among the timings for executing the retry operations among a plurality of overcurrent protection devices connected to a common power supply. When a battery voltage (VBA) becomes a value equal to or lower than a threshold voltage after an FET (Q) of an IC circuit (-) is turned on, all FETs (Q) of the respective IC circuits are turned off, and a time until the battery voltage (VBA) reduces to a value lower than a threshold voltage after the turning-on of the FET (Q) is clocked. When the time is smaller than 400 μsec, the count value N is incremented. Further, turning-on of the FETs (Q) is repeated after the lapse of the standby time (Tp) set randomly. When the count value N reaches 7, the FET (Q) of the IC circuit-is held in the turned-off state. Accordingly, only the load-driving circuit at which the dead short occurs can be stopped and the driving of the other load-driving circuits can be continued.