Device and method for determining rare short circuit

Details Device and method for determining rare short circuit Device and method for determining rare short circuit

2006-05-23

2006-05-23

Leja, Ronald (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C361S104000

Reexamination Certificate

active

07050281

ABSTRACT:
A device for easily determining whether a rare short circuit, which results from the generation of heat exceeding a predetermined value, has occurred in a load circuit. The device includes a fuse for detecting a load current that flows through the load circuit and generates a detection signal. A determination circuit is connected to the fuse to determine whether a rare short circuit has occurred. The determination circuit calculates one of a first parameter and a second parameter based on the detection signal. The first parameter relates to a first time period during which the load current exceeds a predetermined reference current value. The second parameter relates to a second time period during which the load current is less than or equal to the predetermined reference current value. The determination circuit cumulates one of the parameters every predetermined time interval to calculate a cumulative parameter value and determines whether a rare short circuit has occurred based on the cumulative parameter value.

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US 2003/0142449 A1 Iwata et al. 361/58.

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