Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1980-11-26
1983-07-05
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315106, 315225, 315239, 315244, 315278, 315291, 315DIG4, H05B 4129
Patent
active
043920870
ABSTRACT:
A low cost high frequency electronic dimming ballast for gas discharge lamps is disclosed which eliminates the need for external primary inductance or choke coils by employing leakage inductance of the transformer. The system is usable with either fluorescent or high intensity discharge lamps and alternate embodiments employ the push-pull or half-bridge inverters. Necessary leakage inductance and tuning capacitance are both located on the secondary of the transformer. Special auxiliary windings or capacitors are used to maintain necessary filament heating voltage during dimming of fluorescent lamps. A clamping circuit or auxiliary tuned circuit may be provided to prevent component damage due to over-voltage and over-current if a lamp is removed during operation of the system.
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Roddam, Thomas, "Transistor Inverters and Converters", Chapter 10 of Design of Solid State Power Supplies, Princeton, N.J.
Haver, Robert J., "The Verdict Is In: Solid-State Fluorescent Ballasts are Here", EDN Nov. 15, 1976.
Honeywell Inc.
LaRoche Eugene R.
Mersereau Charles G.
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