Break-before-make solid state relay

Details Break-before-make solid state relay Break-before-make solid state relay

1981-12-16

1983-10-04

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307471, 307311, H03K 3295, H03K 1921, H03K 342

Patent

active

044081375

ABSTRACT:
A solid state relay is provided with a control logic circuit which receives a low level input control signal and controls at least two power field effect transistor (FET) switching elements by means of optical isolators. Break-before-make operation is accomplished by a logic circuit which momentarily turns off all FET's each time the relay is switched. Connecting an external power source to a function selecting input terminal causes the relay to operate as a normally open, normally closed, or latching relay. A voltage spike suppression network protects the FET from voltage spikes appearing across it. FET turn off time is reduced by using a Zener diode to limit maximum gate voltage.

REFERENCES:
patent: 4048522 (1977-09-01), Gary et al.
patent: 4188547 (1980-02-01), Fox

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