Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1988-12-06
1991-03-05
Laroche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315219, 315291, 315DIG4, 315DIG5, 315DIG7, H05B 3702, H05B 4136, G05F 100
Patent
active
049980459
ABSTRACT:
A fluorescent lamp dimmer, for use with one or more fluorescent lamps where large ratios of luminous differences are required, which includes apparatus for powering the arc current for the fluorescent lamps from a source of pulsating voltage of variable pulse width and variable frequency both of which can be changed by relatively small amounts and still produce very large changes (15,000:1) in luminescence.
REFERENCES:
patent: 4346332 (1982-08-01), Walden
patent: 4370600 (1983-01-01), Zansky
patent: 4682080 (1987-07-01), Ogawa et al.
patent: 4704560 (1987-11-01), Mills et al.
Honeywell Inc.
LaRoche Eugene R.
Shingleton Michael B.
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