Current overload protected solid state relay

Details Current overload protected solid state relay Current overload protected solid state relay

1984-07-05

1986-04-08

Moose, Jr., Harry E.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307584, 361 93, 361 98, 361100, H02H 3093

Patent

active

045815402

ABSTRACT:
A control circuit for protecting a metal oxide semiconductor field-effect power transistor from current overloads is disclosed in one embodiment of the control circuit. A silicon controlled rectifier is used to remove the bias voltage from the MOSFET in the event of a current overload. In another embodiment of the invention a bipolar transistor in combination with a second MOSFET is used to turn off the power MOSFET in the event of a current overload. The voltage appearing across the power MOSFET is used as an indication of a current overload condition.

REFERENCES:
patent: 4227098 (1980-10-01), Brown et al.
patent: 4363068 (1982-12-01), Burns
patent: 4429339 (1984-01-01), Jaeschke et al.
patent: 4453193 (1984-06-01), Huang et al.
patent: 4487457 (1984-12-01), Janutka
patent: 4509102 (1985-04-01), Ayer

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