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US 4,539,480 AGranted
Electrical isolation system
AssigneeCibertec S.A.
InventorsAntonio T. Artinano, Hernan N. Jimenez, Bernal C. Thalman, Marco A. E. Vasquez
Life of this patent
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Abstract
An electrical isolation system formed of a pair of optically interconnected emitter-receiver systems of similar character disposed in input and output loop circuits with associated means to balance a signal induced current in the input loop with a control induced current in the output loop circuit.
Claims11
A linear isolation circuit system for interconnecting two operationally interrelated subcircuits comprising
- an input circuit including
- first light-emitting means for producing a quantum of light proportional to the magnitude of an electrical signal to be transmitted,
- first photo detector means responsive to the quantum of light produced by said first light-emitting means for generating a first selectively directed electrical current at a junction point of a magnitude proportional to said quantum of light emitted by said first light-emitting means, and
- first light transmitting means for optically transmitting said quantum of light from said first light-emitting means to said first photo detector means;
- an output circuit including
- second light-emitting means for producing a quantum of light proportional to the magnitude of a control current flowing therethrough,
- second photo detector means responsive to the quantum of light produced by said second light-emitting means for generating a second electric current of a magnitude proportional to said quantum of light produced by said second light-emitting means and selectively directed toward said junction point in opposition to said first selectively directed current generated by said first photo detector means,
- second light transmitting means for optically transmitting said quantum of light from said second light-emitting means to said second photo detector means,
- amplifier means responsive to the magnitude of said first current from said first photo detector at said junction point for producing said control current for said second light-emitting means in a magnitude to effect the emission of sufficient light therefrom to render the magnitude of said second current equal to that of said first current,
- whereby the magnitude of said control current for said second light emitting means is proportional to the magnitude of said electrical signal and is electrically isolated therefrom.
7 more elements
A linear isolation circuit for interconnecting two operationally interrelated subcircuits comprising
- an analog input loop including a light emitter and a photo detector interconnected by light transmission means for generating a first selectively directed electric current through a junction joint adjacent said photo detector of a magnitude proportional to a signal applied to said light emitter,
- an analog output loop including a light emitter and a photo detector interconnected by light-transmission means for generating a second and oppositely directed electric current through said latter photo detector and said junction joint in response to passage of a control current through said output loop light emitter, and
- amplifier means responsive to the magnitude of said first electric current at said junction point for generating said control current in a magnitude that results in the magnitude of said second current equalling that of said first current.
Dependencies are inferred from the claim text.