Vital contact isolation circuit

Details Vital contact isolation circuit Vital contact isolation circuit

1981-01-16

1982-12-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, 307442, G02B 2700

Patent

active

043651640

ABSTRACT:
A contact monitoring circuit for producing a dynamic signal representative of the state of a contact. The circuit includes a control signal generator for generating a pair of optical pulse streams comprised of alternate and sequential optical pulses. A pair of gating means, each responsive to one of the pair of pulse streams, connects each of two conductors to one of a positive and negative source of potential in time coincidence with the associated pulse stream. A circuit means, including an optical coupler, the contact being monitored and a fixed potential, has a complete supply circuit during times coincident with only one of the pulse streams, the condition of the contact determines which of the pulse streams will complete the supply circuit. Therefore, the optical coupler produces a dynamic signal representative of the contact state.

REFERENCES:
patent: 3995173 (1976-11-01), Sibley

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