High voltage IC-driven half-bridge gas discharge ballast

Details High voltage IC-driven half-bridge gas discharge ballast High voltage IC-driven half-bridge gas discharge ballast

1996-05-13

1998-02-17

Pascal, Robert

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315307, 315291, 315DIG5, 315DIG7, H05B 3702

Patent

active

057194726

ABSTRACT:
A ballast circuit for a gas discharge lamp includes a resonant load circuit incorporating a gas discharge lamp and including first and second resonant impedances whose values determine the operating frequency of the resonant load circuit. Further included is a d.c.-to-a.c. converter circuit coupled to the resonant load circuit so as to induce an a.c. current in the resonant load circuit. The converter includes first and second switches serially connected between a bus conductor at a d.c. voltage and ground, and has a common node through which the a.c. load current flows. A feedback circuit provides a feedback signal indicating the level of current in the resonant load circuit. A high voltage IC drives the first and second switches at a frequency determined by a timing signal which predominantly comprises the feedback signal during lamp ignition, whereby during lamp ignition the feedback signal causes the high voltage IC to drive the first and second switches towards a switching frequency which promotes resonant operation of the resonant load circuit.

REFERENCES:
patent: 4585974 (1986-04-01), Stupp et al.
patent: 4791338 (1988-12-01), Dean et al.
patent: 5051662 (1991-09-01), Counts
patent: 5075599 (1991-12-01), Overgoor et al.
patent: 5382881 (1995-01-01), Farkas et al.
patent: 5382882 (1995-01-01), Nerone
patent: 5406177 (1995-04-01), Nerone
patent: 5408162 (1995-04-01), Williams
patent: 5612597 (1997-03-01), Wood
patent: 5619104 (1997-04-01), Eunghwa
"Ballast IC Applications Information (IR2151): Pre-Heating a Lamp Filament Without a PTC Resistor," International Rectifier Corporation, Oct. 1994, three pages.
"L6569: High Voltage Half Bridge Driver with Oscillator," SGS-Thompson Microelectronics, Mar. 1996, six pages.
"Provisional Data Sheet on IR 2155 Self-Oscillating Power MOSFET/IGBT Gate Driver," International Rectifier, Aug., 1993, five pages the IR2155 driver being functional similar to the IR2151 driver mentioned at page 3 of the present specification.

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