Protection circuit for digital power module

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor

Reexamination Certificate

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C361S093100, C361S093800, C361S093900

Reexamination Certificate

active

07468874

ABSTRACT:
A sensorless protection circuit comprises a detection module. The detection module receives a reference voltage signal and receives a load voltage signal from a MOSFET. The detection module generates a detection signal having a first state and a second state according to the reference voltage signal and the load voltage signal. A protection module receives the detection signal and maintains the MOSFET in an ON state when the detection signal is in the first state and transitions the MOSFET from the ON state to an OFF state when the detection signal is in the second state. The detection signal is in the second state when the MOSFET is in at least one of a current overload condition, an over temperature condition, a startup inrush current condition, and a short circuit condition.

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