Voltage-controlled ballast for gas-discharge lamps

Details Voltage-controlled ballast for gas-discharge lamps Voltage-controlled ballast for gas-discharge lamps

1998-07-06

2000-11-14

Vu, David

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Arc machining

315223, 315224, 315307, H05B 3702

Patent

active

061474592

ABSTRACT:
An electronic, externally controlled ballast has a control oscillator which feeds a fluorescent lamp via an invertor bridge and a resonant circuit. To keep the voltage constant, there are derived from the lamp AC voltage charge packets whose size (and/or phase angle) characterizes the size of the lamp AC voltage. The charge packets are conducted onto a frequency-determining capacitor of the oscillator, which is designed as a sweep oscillator, voltage control thereby being achieved. The ballast provides for reliable operation of gas-discharge lamps. Its design is robust and yet simple, avoids undesired hunting and delivers a good degree of voltage stability.

REFERENCES:
patent: 4631449 (1986-12-01), Peters
patent: 5449981 (1995-09-01), Auld et al.
patent: 5563777 (1996-10-01), Miki et al.
patent: 5914572 (1999-06-01), Qian et al.

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