Active snubbing in a discharge lamp ballast

Details Active snubbing in a discharge lamp ballast Active snubbing in a discharge lamp ballast

1997-06-02

2000-04-25

Philogene, Haissa

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315209R, 315244, 363 53, 363126, G05F 100

Patent

active

060548169

ABSTRACT:
A snubbing network is provided for reducing electromagnetic ("EM") radiation from and power dissipation of a lamp discharge ballast. The snubbing network employs at least one active device. That device being a switch coupled in parallel with the modulating switch within a converter of the ballast. The snubbing switch, in conjunction with a current limiting inductor, and a voltage change rate limiting capacitor serve to substantially eliminate reverse recovery current within a freewheeling diode of the converter prior to closing the larger (modulating) switch. Reducing the reverse recovery current before closing the modulating switch helps minimize power dissipation during switch closure. A benefit of reduced power dissipation is a reduction in EM radiation from the lamp ballast to noise sensitive electronic components placed nearby.

REFERENCES:
patent: 4328446 (1982-05-01), Fallier, Jr. et al.
patent: 4342948 (1982-08-01), Samuels
patent: 4403173 (1983-09-01), Mayer
patent: 5424611 (1995-06-01), Moriarty, Jr.

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