Protection circuit and method for protecting a switch from a...

Details Protection circuit and method for protecting a switch from a... Protection circuit and method for protecting a switch from a...

2007-10-09

2007-10-09

Sherry, Michael (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C361S093700

Reexamination Certificate

active

10873436

ABSTRACT:
A protection circuit for protecting a switch from a fault includes a first sensing circuit and a second sensing circuit. The first sensing circuit senses a low-side load current through a switch that includes a first terminal, a second terminal and a control terminal. The first terminal is connected to a low-side of the load and the second terminal is connected to ground. The switch provides a conductive path between the first and second terminals responsive to a control signal provided on the control terminal. The first sensing circuit acts to reduce a magnitude of the control signal to limit the low-side load current, carried by the switch, when the low-side load current exceeds a first predetermined value. The second sensing circuit senses a voltage at the low-side of the load and interrupts the low-side load current, when the voltage at the low-side of the load exceeds a second predetermined value.

REFERENCES:
patent: 4809122 (1989-02-01), Fitzner
patent: 5091664 (1992-02-01), Furuhata
patent: 5444591 (1995-08-01), Chokhawala et al.
patent: 6538480 (2003-03-01), Takada et al.
patent: 7012792 (2006-03-01), Yoshida
patent: 2003/0058593 (2003-03-01), Bertele et al.

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