Dimmable ballast for an electrodeless discharge lamp

Details Dimmable ballast for an electrodeless discharge lamp Dimmable ballast for an electrodeless discharge lamp

2008-03-04

2008-03-04

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

C315S307000, C315SDIG002

Reexamination Certificate

active

07339329

ABSTRACT:
A ballast for an electrodeless discharge lamp includes a high frequency power supply that supplies a high frequency electric power to an induction coil for operating the lamp. A dimmer controller generates a control signal in response to a dimmer command designating a varying dimming ratio. The control signal defines a first period Ton in which the power supply is controlled to apply a coil voltage of a first level V1to the induction coil for operating the lamp. The first period is followed by a second period Toff in which the power supply is controlled to apply the coil voltage of a second level V2that is lower than the first level and fails to sustain the lamp. The control signal defines, between the second period and the first period, a starting period Tst in which the coil voltage increases continuously for smooth transition from an off-condition to an on-condition of the lamp.

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Communication pursuant to Article 96(2) EPC—Appln. No.: 03 774 163.4—2206—Applicant: Matsushita Electric Works, Ltd., Jun. 8, 2007, 5 pages.

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