Electric lamp and discharge devices: systems – Plural load device systems – Plural discharge device loads
Patent
1989-08-28
1990-11-20
Mis, David
Electric lamp and discharge devices: systems
Plural load device systems
Plural discharge device loads
315174, 315209R, 315DIG5, H05B 4124, H05B 4129
Patent
active
049721267
ABSTRACT:
A ballasting system for powering an array of flourescent lamp assemblies, as in a sun tanning apparatus, comprises an electronic frequency converter adapted to convert ordinary 60 Hz power line voltage into two non-current-limited high frequency outputs: a first output of 400 Volt/30 kHz sinusoidal voltage provided between a first pair of distribution conductors, and a second output of 50 Volt/30 kHz sinusoidal voltage provided between a second pair of distribution conductors. Each lamp assembly comprises two mutually parallel-disposed series-connected fluorescent lamps. The 50 Volt/30 kHz voltage is provided to the one end of this assembly and is used by way of an isolation transformer means to provide cathode heating power for the two lamp cathodes located near that end. The 400 Volt/30 kHz, voltage is provided to the other end of the assembly and, in addition to providing cathode heating power by way of isolation transformer means, provides a voltage of magnitude directly suitable for starting and running the two series-connected lamps by way of a simple inductive or capacitive reactance ballast. Every other lamp assembly is ballasted with an inductive reactance ballast; and every alternate other lamp assembly is ballasted with a capacitive reactance ballast. That way, the net load represented by any even number of lamp assemblies will be substantially resistive.
REFERENCES:
patent: 4277726 (1981-07-01), Burke
patent: 4502107 (1985-02-01), Nilssen
patent: 4508996 (1985-04-01), Clegg et al.
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