Title: Protector circuit for solenoid operator

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.

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Inventors: Wiegand, Henry (Philadelphia, PA, US)

Application Number: 963754
Filing Date: 1978-11-27
Publication_date: 1980-08-26
Assignee: Gould Inc. (Rolling Meadows, IL)
Primary Class(es): 361/106 335/156, 361/165
Other Classes:
US Patent Ref:

3500074	Mar, 1970	Obenhaus	361/165.
3781839	Dec, 1973	Bodge	361/106.
4019097	Apr, 1977	Miller et al.	361/106.
4071836	Jan, 1978	Cook et al.	335/16.

Other Refs:
Primary Examiner: Miller, J. D.
Assistant Examiner: Schroeder, L. C.
Attorney: Ostrolenk Faber Gerb & Soffen