Electric lamp and discharge devices: systems – Current and/or voltage regulation – Regulator in shunt to the load device
Patent
1987-04-03
1988-02-02
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Regulator in shunt to the load device
323277, 323280, 363 19, 363 74, 315239, 315242, 315244, 315291, 315DIG7, G05F 100, H05B 3702, H05B 3904, H05B 4136
Patent
active
047230983
ABSTRACT:
An electronic ballast circuit for fluorescent or other gaseous discharge lamps includes a resonant half-bridge inverter circuit. The source voltage to the inverter is a full-wave rectified line voltage together with a DC carry-over voltage for supplying power in the inter-cusp period of the recitified line voltage. A negative feedback circuit is responsive to lamp current to vary the inverter drive frequency and thereby regulate lamp current. The frequency response of the feedback loop is high enough and the gain-versus-frequency response of the inverter is such that lamp current and voltage are regulated to reduce the crest factor of lamp current to compensate for variation in the amplitude of the voltage across the semi-conductor switches.
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Schematic 1, Basic Commercial Circuit dated 5/1/81.
Schematic 2, Revised Circuit dated 12/16/81.
Schematic 3, Single Lamp Version of Schematic 2 dated 7/7/82.
Schematic 4, Low Voltage Supply Revision and Two Lamp Version dated 5/7/82.
Schematic 5, Low Voltage Supply Revision and Four Lamp Version dated 5/7/82.
Schematic 6, Revised Two Lamp Version of Schematic 2.
Schematic 7, Circuit Diagram of Semiconductor Chip U1 in Schematics 1-6.
Chatmon Saxfield
Thomas Industries Inc.
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