Electronic ballast producing voltage having trapezoidal envelope

Details Electronic ballast producing voltage having trapezoidal envelope Electronic ballast producing voltage having trapezoidal envelope

1997-06-20

1999-11-09

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315224, 315307, H05B 3702

Patent

active

059821132

ABSTRACT:
An instant start ballast includes a variable frequency boost circuit and a driven half-bridge inverter having a series resonant, direct coupled, parallel output. A control circuit includes a variable frequency driver section, a multivibrator section, and a sensing section. The variable frequency driver changes frequency smoothly, i.e. without discontinuities. The multivibrator section acts as a switch that is enabled or disabled by the sensing section for controlling the frequency of the inverter. Lamp current is required for continued operation of the control circuit. The multivibrator section controls starting by causing the inverter to produce an output signal having a trapezoidal envelope. In the event of an arc, the control circuit quenches the arc and the multivibrator periodically pulses the lamp to attempt to re-start the lamp.

REFERENCES:
patent: 5500576 (1996-03-01), Russell et al.
patent: 5574336 (1996-11-01), Konopka et al.

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