Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Transformer in the supply circuit
Patent
1983-04-19
1985-12-31
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Transformer in the supply circuit
315278, 315284, 315259, 336160, 336165, H05B 4116, H05B 4124
Patent
active
045623848
ABSTRACT:
A discharge lamp ballast for stabilizing wattage input into a discharge lamp at different levels in two or more ranges comprises a magnetic core forming a closed magnetic circuit. A main winding on the core may be used alone or with an extended winding switched in series, and be connected in series with the lamp across an alternating current source in a lamp operating circuit. A control winding on the core has a triac connected across it to vary the current and thereby the wattage supplied to the lamp in the operating circuit. A pair of gapped shunts, one located between the control winding and the extended winding, and the other between the extended winding and the main winding, assure a proportionally greater control effect on the series reactance in the lamp operating circuit when the extended winding is switched in than when it is not.
REFERENCES:
patent: 2392845 (1946-01-01), Foerste
patent: 2553591 (1951-05-01), Kronmiller
patent: 2664541 (1953-12-01), Henderson
patent: 3521152 (1970-07-01), Emerson
patent: 3873910 (1975-03-01), Willis, Jr.
patent: 4162428 (1979-07-01), Elms
Chatmon Saxfield
General Electric Company
Policinski Henry J.
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