Circuit for energizing cold-cathode fluorescent lamps

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

H - Electricity

05

B

H05B 41/14 (2006.01) H05B 41/232 (2006.01)

Patent

CA 2272674

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.

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