Electronic ballast for high-intensity discharge lamp and method

Electric lamp and discharge devices: systems – Current and/or voltage regulation

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315307, 315308, 315209R, G05F 100

Patent

active

061077542

ABSTRACT:
The electronic ballast includes a power source circuit for transforming a conventional AC power source into a stepped-up DC voltage and a half-bridge type inverted, in response to a pair of switching driving signals, for switching the stepped-up DC voltage to make a high-intensity discharge lamp operate. The ballast also includes a digital controller for generating the pair of the switching driving signals, which have a predetermined dead time respectively between a switching-ON time interval of the switching driving signals and a phase difference of 180 degrees therebetween, in a way that frequencies of the pair of the switching driving signals are gradually shifted into some other stepped levels in turn within a predetermined bandwidth by a predetermined time interval and such a frequency shifting operation is cyclically repeated, to be supplied to the half-bridge type inverter. For the prevention of an audible noise of a high-frequency and stabilization of a flame, the high-intensity discharge lamp is driven in a reformed White Noise Modulation method where a driving signal is repeated with a first identical frequency several to several tens of times during a present period and the driving signal is varied into a second identical frequency and is also repeated several to several tens of times during the next period.

REFERENCES:
patent: 5428268 (1995-06-01), Melis et al.
patent: 5463283 (1995-10-01), Sanderson
patent: 5907223 (1999-05-01), Gu et al.
patent: 5923128 (1999-07-01), Canova
patent: 5925984 (1999-07-01), Fischer et al.
patent: 5932976 (1999-08-01), Maheshwari et al.
patent: 5952794 (1999-09-01), Bergman et al.
patent: 6008594 (1999-12-01), Kita et al.
patent: 6020691 (2000-02-01), Sun et al.
Article: "White-Noise Modulation of High-Frequency High-Intensity Discharge Lamp Ballasts" (IEEE Transactions On Industry Applications, vol. 34, No.3, May/Jun. 1998).

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