Solid state switch

Details Solid state switch Solid state switch

1974-11-29

1976-05-04

Albritton, C. L.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

318471, 318473, 338220, 338232, 338316, H01C 704

Patent

active

039551709

ABSTRACT:
A solid state switch particularly useful in assisting in the starting of permanent split capacitor (PSC) motors is disclosed in which a semiconductive element is used to affect the starting torque of the motor. The semiconductive element is a disk-shaped member composed of material having a relatively low resistance at temperatures below an anomaly point and a steeply sloped positive temperature coefficient (PTC) of resistivity at temperatures above the anomaly. The PTC element is mounted within a casing which comprises two identical interfitting halves and is in electrical connection with members which are combination contacts and terminals. The terminals extend through the casing wall and are provided with contact portions which engage the PTC element along an annular portion of the element near the outer periphery thereof. One contact is provided with spring fingers adapted to react against a wall of the casing to provide desired contact force.

REFERENCES:
patent: 2276732 (1942-03-01), Ludwig et al.
patent: 2853656 (1958-09-01), Dowds
patent: 3203744 (1965-08-01), Batke et al.
patent: 3368856 (1968-02-01), Tisdall et al.
patent: 3835434 (1974-09-01), Kahn
patent: 3842188 (1974-10-01), Peterson

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