Voltage follower circuit for use in power level control...

Details Voltage follower circuit for use in power level control... Voltage follower circuit for use in power level control...

H - Electricity

02

J

323/34

H02J 3/12 (2006.01) H05B 41/36 (2006.01) H05B 41/392 (2006.01)

Patent

CA 2032457

ABSTRACT OF THE DISCLOSURE 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 permit 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 ballast

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