Overload protection circuit for solid state switch

Details Overload protection circuit for solid state switch Overload protection circuit for solid state switch

H - Electricity

02

H

323/6, 341/32.5

H02H 3/00 (2006.01) H01H 9/30 (2006.01) H02H 11/00 (2006.01) H03K 17/082 (2006.01)

Patent

CA 1318352

MIL-091 6J6 ABSTRACT OF THE DISCLOSURE A control device for energization of a load employs a bidirection triggerable solid state switching device connected in series with an alternating current power source and the load. In order to prevent the passage of excessive, potentially destructive currents through the switch if the load is shorted out, the microprocessor which controls the energization of the switch senses the time required for the voltage across the switch to attain a predetermined value. If the load is shorted the potential difference across the switch increases and attains the predetermined value a shorter time after zero-crossing of the alternating current. When this occurs more than a predetermined number of consecutive times, the generation of triggering pulses for the solid state switch is inhibited for a predetermined time. In the preferred embodiment the control device is a thermostat for controlling a temperature modifying load such as a furnace or air conditioner.

555685

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