Electronic ballast with special voltage waveforms

Details Electronic ballast with special voltage waveforms Electronic ballast with special voltage waveforms

1992-12-21

1996-04-23

Gonzalez, Frank

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315219, 315223, 315239, H05B 3702

Patent

active

055106803

ABSTRACT:
An inverter-type electronic ballast for a gas discharge lamp is powered by a DC supply voltage provided from a rectifier-filter combination connected with an ordinary electric utility power line. The absolute magnitude of the DC supply voltage is higher than the peak absolute magnitude of the power line voltage. The ballast includes an inverter circuit operative to provide an inverter output voltage of special trapezoidal-like waveshape; which output voltage is applied to a series-resonant combination of an inductor and a capacitor. The gas discharge lamp is connected in parallel with the capacitor. The inverter is driven by a voltage of special waveshape and controllable frequency. By controlling the frequency, the magnitude of the current supplied to the gas discharge lamp can be adjusted, thereby correspondingly adjusting the amount of light produced by the lamp.

REFERENCES:
patent: 4277728 (1981-07-01), Stevens
patent: 4322658 (1982-03-01), Minarczyk
patent: 4933605 (1990-06-01), Quazi et al.
patent: 4952849 (1990-08-01), Fellow et al.
patent: 5164635 (1992-11-01), De Jong et al.

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