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US 5,394,064 AGranted
Electronic ballast circuit for fluorescent lamps
AssigneeMicro-Technology Inc.-Wisconsin
InventorsKrishnappa Ranganath, Alexander Kurnia
Life of this patent
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Abstract
An electronic ballast circuit for multiple fluorescent lamps. Control is achieved by varying the voltage and the frequency of operation of an inverter utilized to drive the fluorescent lamps. A separate voltage boost converter provides regulated voltage to the converter. Dimming is accomplished by varying the voltage either manually or in response to sensor circuitry.
Claims11
An electronic ballast circuit for operation of a plurality of fluorescent lamps comprising:
- rectifier means connected to a source of alternating current, operated to produce direct current;
- a voltage boost converter connected to the output of said rectifier operated to provide a regulated voltage to an inverter circuit;
- said inverter circuit operated to generate a square wave output to a plurality of resonant circuits through direct connection or by means of transformer isolation;
- each of said resonant circuits connected to a fluorescent lamp to provide operating power to the connected lamp;
- and a control circuit connected to the output of said rectifier and said boost converter, said control circuit operated in response to said converter and an error circuit including a driver having a pair of output circuit connections to said inverter further including an input connected to each of said resonant circuits, to control the amount of voltage to said inverter and to control the frequency of operation of said inverter.
2 more elements
Dependencies are inferred from the claim text.