Overload protection circuit for solid state switch

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

1987-01-20

1989-05-09

Lall, Parshotam S.

Boots, shoes, and leggings

361 6, 361 13, 307115, 307135, 307141, 3072961, 307592, 323223, 323908, H02H 300, H01H 930

Patent

active

048294578

ABSTRACT:
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.

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