CURRENT OVERLOAD PROTECTED SOLID STATE RELAY

摘要

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.