Zero energy-storage ballast for compact fluorescent lamps

Details Zero energy-storage ballast for compact fluorescent lamps Zero energy-storage ballast for compact fluorescent lamps

1998-07-13

1999-08-31

Vu, David H.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315224, 315291, H05B 3702

Patent

active

059457830

ABSTRACT:
A CFL ballast includes complementary-type switching devices connected in series with their gates connected together at a control node. The switching devices supply a resonant tank circuit which is tuned to a frequency near, but slightly lower than, the resonant frequency of a resonant control circuit. As a result, the tank circuit restarts oscillations immediately following each zero crossing of the bus voltage. Such rapid restarts avoid undesirable flickering while maintaining the operational advantages and high efficacy of the CFL ballast.

REFERENCES:
patent: 4544863 (1985-10-01), Hashimoto

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