Circuit for energizing cold-cathode fluorescent lamps

Details Circuit for energizing cold-cathode fluorescent lamps Circuit for energizing cold-cathode fluorescent lamps

1998-08-11

1999-04-06

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315239, 315276, 315246, G05F 100

Patent

active

058923365

ABSTRACT:
An electrical circuit for simultaneously energizing at least a pair of CCFLs that are connected in series. The circuit also includes a transformer having a primary winding adapted to receive an alternating current. A secondary winding is coupled in series with the CCFLs to energize their operation. A shunt capacitor, connected in parallel across one CCFL, significantly reduces the peak voltage that must be applied across the CCFLs. Usually, the circuit also includes an isolation capacitor connected in series between the CCFLs and the secondary winding of the transformer. The isolation capacitor provides both DC blocking and electrical isolation between the secondary winding and the CCFLs.

REFERENCES:
patent: 5430641 (1995-07-01), Kates
patent: 5615093 (1997-03-01), Nalbant
patent: 5619402 (1997-04-01), Liu

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