Opto-electrical signal converter with stabilization

Details Opto-electrical signal converter with stabilization Opto-electrical signal converter with stabilization

1985-08-19

1987-11-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700

Patent

active

047091541

ABSTRACT:
The invention relates to an opto-electrical signal converter for linearly converting a signal consisting of an alternating current superimposed on a direct current into a signal consisting of an alternating voltage superimposed on a direct voltage. Such a converter comprises the combination of a light diode and a photosensitive element optically coupled therewith, which combination is designated as optocoupler.
The invention has for its object to provide a converter having a good linear signal transmission, the value of the output signal of the converter being independent of the properties of the optocoupler used.
For this purpose, the converter is provided with a transistor, of which a semiconductor junction connected to the base of the transistor is AC-connected parallel to the base-emitter junction of the transistor and is DC-connected in series with a stabilization circuit.
As a result, a linear AC and DC transmission, respectively, is reached independently of ageing and of the temperature behaviour of the optocoupler used.

REFERENCES:
patent: 4039863 (1977-08-01), Ohhinata et al.
patent: 4176288 (1979-11-01), Komatsu et al.
"Differential Optical Coupler Hits New High in Linearity, Stability", by Olschewski, Electronics, Jan. 19, 1978, pp. 121-125.

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