Protector circuit for solenoid operator

Details Protector circuit for solenoid operator Protector circuit for solenoid operator

1978-11-27

1980-08-26

Miller, J. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

335156, 361165, H01H 5112

Patent

active

042198615

ABSTRACT:
A protector means is provided to prevent thermal destruction of a solenoid adapted for very short duration energization at currents far in excess of the continuous current carrying capability of the solenoid. The protector means includes a positive temperature coefficient thermistor which controls the gate potential of an S.C.R. whose power circuit is in series with the solenoid. When thermistor temperature rises to a predetermined level the voltage applied to the gate drops below the gate threshold thereby preventing the S.C.R. from firing on the next positive half-cycle.

REFERENCES:
patent: 3500074 (1970-03-01), Obenhaus
patent: 3781839 (1973-12-01), Bodge
patent: 4019097 (1977-04-01), Miller et al.
patent: 4071836 (1978-01-01), Cook et al.

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