Feedback circuit and method of operating ballast resonant...

Details Feedback circuit and method of operating ballast resonant... Feedback circuit and method of operating ballast resonant...

2005-06-14

2005-06-14

Philogene, Haissa (Department: 2828)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S244000, C315S2090SC, C315S360000, C315SDIG007

Reexamination Certificate

active

06906473

ABSTRACT:
A ballast resonant inverter with a self-oscillating driver IC powers and dims a gas discharge lamp. A feedback circuit automatically adjusts IC oscillator frequency for safe and stable inverter operation above the resonant frequency following changes in the resonant load. The feedback signal is derived from resonant inverter output voltage, by attenuating, programmed phase shifting and injecting the resulting signal in a timing circuit of the IC. The feedback circuit includes an active inverter circuit or passive RC phase boosting networks coupled in series. Phase control of the feedback signal by variable RC networks is used in transient modes of ballast-lamp operations.

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International Rectifier, Design Tip DT 98-1, Variable Frequency Drive Using IR215X Self-Oscillating IC's, pp. 331-337, Mar. 15, 1999.
International Rectifier, Application Notes AN-995A, Electronic Ballast Using The Cost-Saving IR215X Driver, pp. C59-C68, no date.

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