Electric lamp and discharge devices: systems – Regulation of the control current and/or potential applied...
Patent
1987-03-17
1989-08-15
Griffin, Robert L.
Electric lamp and discharge devices: systems
Regulation of the control current and/or potential applied...
315307, H05B 4136
Patent
active
048578100
ABSTRACT:
A power supply system for discharge lamps employs a current interruption circuit to control current flow through a discharge lamp. A power switch is connected in series with the lamp and controls the current level in the lamp by controlling lamp current on-time. The current on-time is maintained for a relatively very short time period allowing control of lamp current by controlling the integral of the lamp current or controlling the charge delivered to the lamp during each pulse rather than controlling peak current value. Since the voltage impressed across the lamp generally exceeds the conventional value observed when using a passive current limiting means, for example a series reactor, non radiative losses associated with operating the lamp are reduced.
REFERENCES:
patent: 3771013 (1973-11-01), Roche et al.
patent: 4358716 (1982-11-01), Cordes et al.
patent: 4560908 (1985-12-01), Stupp et al.
Waymouth, John F., "Current Runaway in Fluorescent Lamps", Journal of IES, Oct. 1972, pp. 43-49.
Davenport John M.
Roll Kenneth A.
von Herrmann Pieter J.
Corwin Stanley C.
General Electric Company
Griffin Robert L.
Jacob Fred
McMahon John P.
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