Power device protection circuit

Details Power device protection circuit Power device protection circuit

2008-04-29

2008-04-29

Sherry, Michael (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

C361S018000, C361S093100

Reexamination Certificate

active

11207486

ABSTRACT:
A protected power device includes a power transistor with an internal control line to receive a control line current and a fault detector, coupled to the internal control line. A power device protection circuit includes a power device driver, coupled to the control line to drive the protected power device, a current sensor, coupled to the control line to sense a fault of the protected power device by monitoring the control line current and to generate a fault-sensing signal, and control logic, coupled to the current sensor and to the power device driver to respond to the fault-sensing signal of the current sensor. The fault detector modifies the control line current upon detecting a fault and the current sensor senses the fault by sensing the modified control line current. The control logic responds to the sensed fault by limiting or shutting down the current of the protected power device.

REFERENCES:
patent: 5351162 (1994-09-01), Koishikawa
patent: 6055149 (2000-04-01), Gillberg et al.

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