Input circuit having a photo-coupler with bi-directional indicat

Details Input circuit having a photo-coupler with bi-directional indicat Input circuit having a photo-coupler with bi-directional indicat

1987-04-27

1989-10-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700

Patent

active

048734489

ABSTRACT:
Disclosed is an input circuit using a photo-coupler for circuit isolation which comprises a photo-coupler and an indicator for indicating the presence of an input signal both of which are adapted for an AC input signal as well as a DC input signal of either polarity. Typically, the input end of the photo-coupler comprises a pair of light emitting diodes which are connected in parallel with each other directionally opposite and the indicator comprises a pair of light emitting diode chips which are connected in a similar manner. Thereby, the input circuit can be adapted to input signals of all kinds and the indication of the presence of an input signal is accurate because the indicator is directly driven by the input signal and is not affected by the condition of any external circuit.

REFERENCES:
patent: 4041331 (1977-08-01), Westerman et al.
patent: 4063121 (1977-12-01), Bartlett
patent: 4143287 (1979-03-01), Biggs
patent: 4612670 (1986-09-01), Henderson
patent: 4628303 (1986-12-01), Boyle
patent: 4636655 (1987-01-01), Nagano
patent: 4658145 (1987-04-01), Awaji

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