Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Reexamination Certificate
2006-08-25
2010-11-30
Fureman, Jared J (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
C361S018000, C361S093500
Reexamination Certificate
active
07843675
ABSTRACT:
In an overcurrent protection circuit23according to the present invention, a timer circuit TMR that generates an overcurrent protection signal EN according to the results of comparison between a detection voltage Va (Vb) and VrefL and VrefH is configured as follows. When Va (Vb) has reached VrefL, the timer circuit TMR starts to count T1. When T1has elapsed with Va (Vb) kept above VrefL, the timer circuit TMR changes EN to a disabled state and starts to count T2. When T2has elapsed, the timer circuit TMR returns EN to an enabled state. On the other hand, after Va (Vb) has reached VrefL and T1starts to be counted, when Va (Vb) has reached VrefH, the timer circuit TMR forcibly stops the counting of T1without waiting for T1to elapse, changes EN to a disabled state, and starts to count T2. With this configuration, it is possible to offer necessary and sufficient protection for an object to be protected (for example, a load or an element provided inside a device).
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Brooks Angela
Fish & Richardson P.C.
Fureman Jared J
Rohm & Co., Ltd.
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