Optocoupler built-in self test for applications requiring isolat

Details Optocoupler built-in self test for applications requiring isolat Optocoupler built-in self test for applications requiring isolat

1993-03-01

1994-06-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700

Patent

active

053230140

ABSTRACT:
An optocoupler circuit arrangement includes an isolated power source for producing a bipolar test signal, an analog multiplexer switching matrix coupled to the isolated power source for receiving and distributing the test signal, control logic for controlling the analog multiplexer switching matrix, and a plurality of optocouplers, each having a respective electrically isolated output circuit and an input circuit for receiving input signals from an external source. The optocoupler input circuits are coupled to the analog multiplexer switching matrix to receive respective test signals therefrom under control of the control logic. Blocking circuitry is provided at the optocoupler input for isolating the test signals from the external source.

REFERENCES:
patent: 4328516 (1982-05-01), Colpack et al.
patent: 4604613 (1986-08-01), Clark
patent: 4652764 (1987-03-01), Nagano
patent: 4771403 (1988-09-01), Maskovyak et al.
patent: 4808975 (1989-02-01), Hochhaus et al.
patent: 4914420 (1990-04-01), Khan
patent: 4990896 (1991-02-01), Gray
patent: 5089696 (1992-02-01), Turpin

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