Electronic ballast for a discharge lamp

Details Electronic ballast for a discharge lamp Electronic ballast for a discharge lamp

2005-09-13

2005-09-13

Lee, Wilson (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S307000

Reexamination Certificate

active

06943502

ABSTRACT:
An electronic ballast for a discharge lamp has a compact arrangement of electric parts. The ballast includes an AC-DC converter and an inverter giving a high frequency output voltage for operating the lamp. The inverter includes switching elements, a control circuit, and an output transformer for connection with the lamp. A single circuit board mounts the electric parts forming the converter and the inverter. The circuit board is accommodated within a tubular casing together with a dielectric sheet which is provided for insulating the circuit board as well as the electric parts from the casing. The output transformer is mounted on a top surface of the circuit board together with some of the other electric parts. The ballast includes chip components forming a detection circuit for lamp condition, and the circuit board mounts the chip components on a bottom surface at a location immediately opposite of the output transformer.

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W. Chen et al.: “An improved charge pump electronic ballast with low THD and low crest factor” APEC '96. Eleventh Annual Applied Power Electronics Conference and Exposition, vol. 2, conf. 11, pp. 622-627 Mar. 3, 1996-Mar. 7, 1996.

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