Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1983-06-01
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...
315 95, 315105, 315177, 315185R, 315205, 315206, 315210, 315224, 315290, H05B 3702
Patent
active
045033625
ABSTRACT:
A frequency stabilized automatic gain controlled ballast system (10) which is coupled to a power source (12) in order to operate at least one of a pair of gas discharge tubes (40 and 40'). Each of the gas discharge tubes (40, 40') include respective filaments (42, 44 and 42', 44'). A frequency control circuit (11) is coupled to the power source (12) and includes a frequency control transformer (43) and a frequency control capacitor (50) for establishing a constant oscillation signal at a predetermined frequency. A switching network (13) is connected to the frequency control circuit (11) for establishing a pulsating current responsive to the constant oscillation signal of predetermined frequency. Induction circuitry (15) is coupled to the switching network (13) and the frequency control circuit (11) and includes an inverter transformer (78) as well as coupling capacitors (86 and 88) for generating a voltage across the gas discharge tubes (40 and 40'). Automatic gain control circuitry (17) is included in inverter transformer (78) and is made up of a pair of secondary windings (80 and 81) wound in a manner to provide a negative feedback voltage to each of the transistors (70 and 70') of switching network (13). The inverter transformer (78) has a pair of primary windings (82 and 84) which operate alternately and are coupled to the primary winding (45) of frequency control transformer (43) to provide a repetitive cycle. First and second coupling capacitors (86 and 88) are coupled to primary windings (82 and 84) of inverter transformer (78) and filaments (42 and 42') of gas discharge tubes (40 and 40') for discharging the induced voltage across the tubes ( 40 and 40').
REFERENCES:
patent: 3753071 (1973-08-01), Engel et al.
patent: 4045711 (1977-08-01), Pitel
patent: 4127795 (1978-11-01), Knoll
patent: 4127798 (1978-11-01), Anderson
Dixon Harold
Intent Patent A.G.
Rosenberg Morton J.
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