Current monitor using a DC isolating amplifier circuit

Details Current monitor using a DC isolating amplifier circuit Current monitor using a DC isolating amplifier circuit

1990-06-01

1992-02-18

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 91, 361 56, 340664, 340640, G01R 1900, G01R 19165

Patent

active

050899260

ABSTRACT:
A current monitor includes a DC isolating amplifier circuit especially adapted for adjusting the set point of a comparator. The isolating amplifier circuit includes an operational amplifier generating a first current in response to an input voltage received by the operational amplifier. The first current is transmitted to a first optocoupler and a second optocoupler which are characterized by a first CTR and a second CTR, respectively. An output of the first optocoupler is fed back to an input of the operational amplifier while an output voltage of the second optocoupler is communicated to a set point circuit. The output voltage of the second optocoupler varies as a function of the product of the input voltage of the operational amplifier and a ratio between the first CTR and the second CTR.

REFERENCES:
patent: 4115828 (1978-09-01), Rowe et al.
patent: 4414539 (1983-11-01), Armer
patent: 4943761 (1990-07-01), Fox et al.

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