Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1982-07-16
1985-03-05
Dixon, Harold
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315219, 315226, 315254, H05B 3702
Patent
active
045033617
ABSTRACT:
An electronic ballast system (200) which is coupled to a power source (204) in order to actuate at least one of a pair of gas discharge tubes (202 and 202'). Each of the gas discharge tubes (202, 202') include respective first and second filaments (206, 208 and 206', 208'). The system (200) includes a first transformer (238) which is coupled to the power source (204) and the first transformer (238) includes a primary winding (240) and a secondary winding (242) for establishing an oscillation signal. A first and second transistor network (252 and 254) are feedback coupled to the first transformer (238) for switching a current signal responsive to the oscillation signal. Additionally, a first and second inverter transformers (210 and 212) are provided with each of the inverter transformers (210 and 212) having in tapped windings (288 and 290) respectively, for establishing an induced voltage signal responsive to the current signal. Each of transformers (210 and 212) further include a pair of secondary windings (292, 294) as well as (296, 298). First and second coupling capacitors (308 and 310) are connected to the tapped windings (288 and 290) of the inverter transformers (210 and 212) and filaments (206 and 206') of gas discharge tubes (202 and 202') for discharging the induced voltage signal to the first filaments (206 and 206'). A first and second capacitance tuning network including the elements (312, 314 and 316, 318) are coupled to the tapped windings (288, 290) and the secondary windings (292, 294 and 296, 298) of the inverter transformers (210 and 212) for modifying a resonant frequency and a duty factor of a signal pulse generated in the inverter transformers (210 and 212).
REFERENCES:
patent: 3396307 (1968-08-01), Campbell
patent: 3418527 (1968-12-01), Miller
patent: 3753071 (1973-08-01), Engel et al.
patent: 4109307 (1978-08-01), Knoll
patent: 4259614 (1980-03-01), Kohler
patent: 4392085 (1983-07-01), Knoll et al.
Dixon Harold
Intent Patent A.G.
Rosenberg Morton J.
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