Over-current protection circuit

Details Over-current protection circuit Over-current protection circuit

2011-05-17

2011-05-17

Patel, Dharti H (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C361S093700, C361S093900, C361S087000, C361S018000, C323S274000

Reexamination Certificate

active

07944663

ABSTRACT:
An over-current protection circuit for use with a constant voltage circuit that converts an input voltage to a predetermined output voltage and that outputs the predetermined output voltage. The over-current protection circuit includes an output current detecting circuit configured to output an output current detecting voltage proportional to an output current outputted from the constant voltage circuit; an output current control circuit configured to control the output current outputted from the constant voltage circuit according to the output current detecting voltage outputted from the output current detecting circuit; an output voltage detecting circuit configured to output at least an output voltage detecting voltage according to the output voltage of the constant voltage circuit; and a conversion rate altering circuit configured to alter a conversion rate of the output current to the output current detecting voltage of the output current detecting circuit according to the output voltage detecting voltage outputted from the output voltage detecting circuit.

REFERENCES:
patent: 7411376 (2008-08-01), Zhang
patent: 2003/0128489 (2003-07-01), Katoh et al.
patent: 2005/0036246 (2005-02-01), Nagata et al.
patent: 2007/0115045 (2007-05-01), Nagata et al.
patent: 2007/0176582 (2007-08-01), Okuda et al.
patent: 2004-234619 (2004-08-01), None
patent: 2005-175439 (2005-06-01), None
patent: 3782726 (2006-03-01), None

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