Full-bridge inverter for discharge lamp lighting device with var

Details Full-bridge inverter for discharge lamp lighting device with var Full-bridge inverter for discharge lamp lighting device with var

1993-09-22

1995-07-18

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315224, 315307, 363 17, H05B 3702

Patent

active

054344794

ABSTRACT:
A discharge lamp lighting device employs first and second series circuits, each series circuit including two switching elements and a connecting point located therebetween. The first and second series circuits are both connected in parallel across a DC voltage source. A load circuit, including a discharge lamp, is connected between the two connecting points in the first and second series circuits. ON/OFF timing of the switching elements in the first series circuit varies between in-phase and 180 degrees out-of-phase from ON/OFF timing of the switching elements in the second series circuit. The ON period ratio of the switching elements is different in at least one of the first and second series circuits. The device allows dimming of the discharge lamp over a wide range, and lighting of the discharge lamp with a small supplied power.

REFERENCES:
patent: 3750004 (1973-07-01), Walker
patent: 4370600 (1983-01-01), Zansky
patent: 4504895 (1985-03-01), Steigerwald
patent: 4734624 (1988-03-01), Nagase et al.
patent: 4855888 (1989-09-01), Henze et al.
patent: 4931185 (1990-09-01), Schulten et al.
patent: 4935669 (1990-06-01), Nillssen
patent: 5027040 (1991-06-01), Ikeda et al.
patent: 5087859 (1992-02-01), Blankers
patent: 5166579 (1992-11-01), Kawabata et al.
"Off-Line Application of the Fixed-Frequency Clamped-Mode Series Resonant Converter"; Juan A. Sabate and Fred C. Y. Lee; IEEE Transactions on Power Electronics, vol. 6, No. 1, Jan. 1991.

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