Ballast circuit for gas discharge lamps

Details Ballast circuit for gas discharge lamps Ballast circuit for gas discharge lamps

2006-06-15

2008-10-28

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S224000, C315S307000

Reexamination Certificate

active

07443105

ABSTRACT:
A ballast circuit for a gas discharge lamp, having the capability to shift frequency after starting to reduce electromagnetic interference (EMI). Embodiments of the circuit contain an oscillator circuit that generates and supplies an oscillating signal and a time delay circuit, which generates a time delay to signal the oscillator to shift frequency. In embodiments of the circuit, the frequency shift is achieved by selecting different passive components used to generate the oscillator frequency.

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International Rectifier Preliminary Data Sheet PD60062-L, IR2153D(S) & (PbF), Self-Oscillating Half-Bridge Driver.

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