Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1996-10-21
1998-09-08
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340555, 359143, 359187, G08B 2900
Patent
active
058050620
ABSTRACT:
An isolation amplifier that transmits data to a receiver via a current loop, where the isolated portion of the circuit is powered by a photovoltaic array illuminated by a light source powered directly by the current loop. Optionally, the photovoltaic array is additionally illuminated by any excess power tapped from the current loop by the non-isolated portion of the circuit. Preferably, the light source is an array of light-emitting diodes. Preferably the photovoltaic array is an array of photocells sensitive to the same wavelengths emitted by the light-emitting diodes. Preferably, there are optical conductors connecting the LED's to the photocells.
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Crosland Donnie L.
Mini-Systems, Inc.
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