Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1989-12-26
1991-07-02
Skudy, R.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323293, 323325, 315194, 315291, G05F 156, G05F 163
Patent
active
050288628
ABSTRACT:
A power control system includes a voltage follower circuit which may be interposed between a load power control circuit which adjusts the level of power applied to a load, and a variable impedance whose internal impedance prescribes the desired level of power. A feedback voltage from the output of the voltage follower circuit is compared with a corresponding voltage across the variable impedance and the difference between them is used to drive the output voltage of the voltage follower circuit toward the input voltage. The voltage follower circuit permits control by a single variable impedance of many more load power control circuits than a single variable impedance can normally handle, and without appreciably affecting the power level as a function of the impedance level. This circuit is particularly useful in a system for controlling the level of light received from fluorescent light fixtures controlled by electronic ballasts.
REFERENCES:
patent: 4144478 (1979-03-01), Nuver
patent: 4575654 (1986-03-01), Basch
patent: 4628230 (1986-12-01), Krokaugger
patent: 4642526 (1987-02-01), Hopkins
patent: 4651060 (1987-03-01), Clark
patent: 4804916 (1989-02-01), Frank
patent: 4837506 (1989-06-01), Patterson
Honeywell Inc.
Schwarz Edward
Skudy R.
Todd Voeltz Emanuel
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