Electric lamp and discharge devices: systems – With signal – indicator – or alarm – Plural load device systems
Patent
1987-02-26
1988-06-28
Moore, David K.
Electric lamp and discharge devices: systems
With signal, indicator, or alarm
Plural load device systems
315189, 315256, 315220, 315247, H01J 160
Patent
active
047542012
ABSTRACT:
A series ballast circuit for operating a gas discharge tube from a constant current alternating voltage source having a fundamental frequency is disclosed. The primary feature of the ballast circuit comprises a ballast transformer having a magnetic core and at least a primary coil and at least a secondary coil. The ballast transformer has parameters that are selected in accordance with the operational conditions, that is, the extinguished and non-extinguished states of the gas discharge lamp. The primary coil and the area of the core have parameters selected in accordance with the extinguished state of the gas discharge tube. The primary and secondary coils have a selected turn ratio so as to produce a current level sufficient to maintain the ionization condition of the gas discharge tube in its non-extinguished state. The ballast circuit is operated in its heavy saturation condition during the extinguished state of the gas discharge so as to reduce the low factor, that is, the volt-ampere requirement of the ballast circuit itself. Reduction of the volt-ampere rating increases the number of ballast circuits that may be interconnected to the constant current alternating voltage source.
REFERENCES:
patent: 2297258 (1942-09-01), Spanner
patent: 4293799 (1981-10-01), Roberts
patent: 4295079 (1981-10-01), Otsuka et al.
patent: 4396868 (1983-08-01), Watanabe et al.
Knoble David W.
Sanders Joseph W.
General Electric Company
Jacob Fred
McMahon John P.
Moore David K.
Razavi Michael
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