Ballast for independent parallel operation of low-pressure gas d

Details Ballast for independent parallel operation of low-pressure gas d Ballast for independent parallel operation of low-pressure gas d

1998-04-07

2000-01-04

Wong, Don

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315324, 315225, 315307, H05B 3702

Patent

active

060113588

ABSTRACT:
An electronic ballast is provided for the operation of one or more gas discharge lamps. The electronic ballast has at least one inverter half bridge and a driving circuit that prescribes the inverter frequency. In the event of overvoltage across a gas discharge lamp, the driving circuit is brought into a locking state in which it blocks the inverter half bridge. This is performed via a circuit resembling a thyristor, which reduces the supply voltage of the driving circuit below a predetermined value. Provided for the purpose of unlocking and restarting the driving circuit is a detector circuit which detects the insertion of a new gas discharge lamp into its respective holder. This is accomplished by pinpoint detection of a steep pronounced voltage rise at a terminal of a gas discharge lamp which is connected to the intermediate circuit voltage via the filament of the gas discharge lamp. The detector circuit contains a filter which filters out and evaluates the voltage rise and suppresses interference voltages which could otherwise lead to defective restarting operations.

REFERENCES:
patent: 4710682 (1987-12-01), Zuchtriegel
patent: 5422548 (1995-06-01), Yamashita et al.
patent: 5465029 (1995-11-01), Hanazaki et al.
patent: 5583399 (1996-12-01), Rudolph
patent: 5770925 (1998-06-01), Konopka et al.

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