Circuit for detecting the flow of an excess of reverse power fro

Details Circuit for detecting the flow of an excess of reverse power fro Circuit for detecting the flow of an excess of reverse power fro

1976-12-28

1978-07-11

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 84, H02H 342

Patent

active

041005872

ABSTRACT:
A circuit disposed between a power supply and a load for detecting the flow of an excess of power from the load back through the supply. The circuit is comprised of means for sensing the instantaneous current flowing between the power supply and the load, and means for sensing the instantaneous output voltage from the power supply. The circuit is further comprised of means responsive to the sensed instantaneous voltage and current for generating a signal that is indicative of instantaneous power flowing between the power supply and the load. Means is also provided for filtering out those components of the signal indicative of the instantaneous power which are at a frequency higher than the frequency of the AC current flowing between the power supply and the load to obtain a signal having a magnitude indicative of the average power flowing therebetween. Further provided is means responsive to the average power signal for generating a signal to cause the disconnection of the power supply from the load when the average power signal is of a magnitude and polarity which is indicative of an excess in reverse power flowing from the load to the power supply.

REFERENCES:
patent: 3532935 (1970-10-01), Waldron
patent: 3697811 (1972-10-01), Little
patent: 3875509 (1975-04-01), Milkovic
patent: 3921070 (1972-09-01), Ringstad et al.

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