Low leakage, solid state a-c power contact

Details Low leakage, solid state a-c power contact Low leakage, solid state a-c power contact

1985-12-17

1987-09-01

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

361 91, 361101, H02H 308

Patent

active

046912630

ABSTRACT:
A power contact with low off current for switching a-c loads in response to a logic signal includes a rectifier bridge circuit in a series with the load and the a-c power source, a MOSFET connected across the d-c terminals of the bridge, and a series RC filter circuit in parallel with the MOSFET. A metal oxide varistor connected across the d-c side of the bridge protects the MOSFET from transients in the a-c circuit. While this power contact is capable of switching sizable a-c currents, the leakage current with the MOSFET off is less than 1/10 of a milliamp so that it can also be used to switch loads which draw very low level currents. The MOSFET is electrically isolated from the logic signal by an opto-isolator which has a unique switchable output which permits the power contact to be readily adapted for use with normally energized or normally deenergized loads.

REFERENCES:
patent: 4277811 (1981-07-01), Sato
patent: 4320434 (1982-03-01), Stirk
patent: 4494163 (1985-01-01), Yelland et al.
patent: 4600963 (1986-07-01), Hertrich et al.

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