Electronic ballast for high-intensity discharge lamps

Details Electronic ballast for high-intensity discharge lamps Electronic ballast for high-intensity discharge lamps

1997-04-07

1999-07-13

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315307, 315224, 315DIG5, H05B 3702

Patent

active

059231289

ABSTRACT:
An electronic ballast is used for providing a voltage with a varying frequency to fluorescent lamps. The electronic ballast has an inverter to supply a fluorescent lamp load with a voltage having a high frequency, with the inverter being controlled by a control which generates a switching signal. The ballast further includes a triangular current wave generator which provides a triangular waveform that modulates the frequency of the switching signal controlling the inverter. The modulation of the switching signal causes the frequency of voltage supplied to the fluorescent lamp load to vary from the resonant frequency of the circuit.

REFERENCES:
patent: 4373146 (1983-02-01), Bonazoli et al.
patent: 5003230 (1991-03-01), Wong et al.
patent: 5006724 (1991-04-01), Liu
patent: 5010279 (1991-04-01), Lathom et al.
patent: 5359341 (1994-10-01), Hutchings
"White-Noise Modulation of High-Frequency High-Intensity Discharge Lamp Ballasts" by Laskai, et al, IEEE, Jan. 1994, pp. 1953-1961.

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