Yazaki Corporation

Ichiro Toyama

Kazumi Nagasawa

Masashi Nakayama

Kaoru Kurita

Mitsuaki Maeda

Shigemi Ishima

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 &#x3bc;sec, 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.

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Makinohara, Japan

Ichiro Toyama