Gas discharge lamp inverter with a wide input voltage range

Details Gas discharge lamp inverter with a wide input voltage range Gas discharge lamp inverter with a wide input voltage range

1998-04-21

1999-09-07

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 315DIG5, H05B 3700

Patent

active

059491990

ABSTRACT:
A gas discharge lamp driving circuit reduces input power at start-up mode through the utilization of input power diodes and stress capacitors in parallel therewith. The circuit includes a blocking filter for filtering an AC voltage signal, and a rectifier for rectifying the signal into a DC voltage. A smoothing capacitor smooths the voltage, and an inverter, having switches, converts the DC voltage into a high frequency AC voltage. A control circuit controls the switches of the inverter to turn on and off in a feedback manner. A resonant tank is connected to the inverter, and includes a resonant capacitor and a resonant inductor. A discharge lamp is connected to the resonant tank, in parallel with the resonant capacitor. A modulation capacitor is provided for reducing a distortion of the input current to the resonant circuit. The at least two input power diodes and the stress capacitors are connected between the rectifier and the smoothing capacitor, such that a discharge time of the stress capacitors delays a turn-on time of the input power diodes, to reduce input power at start-up.

REFERENCES:
patent: 4511823 (1985-04-01), Eaton et al.
patent: 5274540 (1993-12-01), Maehara
patent: 5404082 (1995-04-01), Hernandez et al.
patent: 5410221 (1995-04-01), Mattas et al.
patent: 5410466 (1995-04-01), Maehara
patent: 5521467 (1996-05-01), Statnic et al.
patent: 5801492 (1998-09-01), Bobel

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