Parallel-storage series-drive electronic ballast

Details Parallel-storage series-drive electronic ballast Parallel-storage series-drive electronic ballast

1997-11-06

1999-06-29

Wong, Don

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315247, 315275, 315291, 315DIG5, H05B 3702

Patent

active

059172908

ABSTRACT:
An electronic ballast is provided for converting an AC voltage and current, supplied by a power source such as a power line, to an alternating square-wave voltage and current having the same frequency, for supply to a discharge lamp. The ballast includes at least one capacitor, bridge switches and high-frequency duty-cycle switches. The bridge switches and the high-frequency duty-cycle switches cooperate to successively electrically connect the capacitor in parallel with the power source, electrically connect the capacitor in series with the power source and the discharge lamp, and to regulate the current provided to and from the capacitor to drive the discharge lamp with a desired square-wave voltage and current at the line frequency.

REFERENCES:
patent: 5416387 (1995-05-01), Cuk et al.
patent: 5444310 (1995-08-01), Kataoka et al.
patent: 5652480 (1997-07-01), Groiss
patent: 5789871 (1998-08-01), Shen et al.
"Principles of Power Electronics" by John G. Kassakian et al, pp. 268-269, Addison-Wesley Publishing Company, 1991.

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