Means for regulating resistance current of complex load

Details Means for regulating resistance current of complex load Means for regulating resistance current of complex load

1979-05-29

1981-04-28

Shoop, William M.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

361235, 363 79, 355 3CH, H01T 1900, G05F 108

Patent

active

042648580

ABSTRACT:
A circuit means by which a high voltage, complex load may be precisely sensed and controlled. With high voltage AC loads, the effect of unavoidable stray capacitances is to render extremely difficult to measure and/or control that portion of total current which contributes actual power; that is, the resistive portion. Herein described is a circuit for rejecting all capacitive currents while measuring only the true resistive portion and deriving from the signal a filtered (averaged) voltage suitable for regulation and/or control. The circuit samples the total current only during the time when there is no capacitive current flowing. This sample is then compared with a reference, the difference amplified, and then averaged over many samples to derive a precise control signal.

REFERENCES:
patent: 3636298 (1972-01-01), Risberg et al.
patent: 3772585 (1973-11-01), Johnson
patent: 3896287 (1975-07-01), Cook
patent: 4038593 (1977-07-01), Quinn
patent: 4039897 (1977-08-01), Dragoset

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