Method and circuit for over-current protection

Details Method and circuit for over-current protection Method and circuit for over-current protection

2011-05-24

2011-05-24

Nguyen, Danny (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C361S093700

Reexamination Certificate

active

07948729

ABSTRACT:
In one embodiment the present invention includes an over-current protection method. The method comprises generating a switching signal, starting and stopping a timer, sensing a current through a switch, comparing a response time to a reference time, and generating an over-current alarm signal. The switching signal activates one or more switches in a switching regulator. The timer is started in response to the switch being activated and is stopped in response to the sensed current exceeding a threshold. The response time indicates the time period between the starting and the stopping of the timer. The over-current alarm signal is generated if the response time is less than the reference time.

REFERENCES:
patent: 5694305 (1997-12-01), King et al.
patent: 7791297 (2010-09-01), Mueller et al.

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