Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1994-04-20
1995-06-20
Pascal, Robert J.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315307, 315291, 315DIG7, H05B 3702
Patent
active
054263484
ABSTRACT:
The present invention provides an apparatus for operating an electronic lamp from an AC line (10) and has a rectifier circuit (12), a power coupling circuit (18), a starting circuit (22), a resonant circuit (24), a feedback circuit (26), a driving circuit (28), and an output coupling circuit (30). The rectifier circuit (12) is connected to the AC line (10) and has a positive output terminal (14) and a negative output terminal (16) for providing DC operating power. The power coupling circuit (18) is connected to the DC operating power and provides power to a drive node (20. The starting circuit (22) provides a starting pulse which starts the feedback circuit (26) and the driving circuit (28) into oscillation. The resonant circuit (24) is connected to the drive node (20) and has a resonant node (32) for providing output power to the electronic lamp (40). The feedback circuit (26) is connected to the resonant node (32) of the resonant circuit (24) and provides oscillatory feedback to the driving circuit (28) so as to cause the driving circuit (28) to oscillate after providing the initial output power pulse. The driving circuit (28) is connected to the output terminals (14, 16) of the rectifier circuit (10) and responds to the starting pulse by providing the initial output power pulse to the drive node (20), and responds to the oscillatory feedback by oscillating and providing output power to the drive node (20). The output coupling circuit (30) is connected to the feedback circuit (26), the output terminals (14, 16) of the rectifier means (10), and the electronic lamp (40), for coupling the output power to the electronic lamp (40).
REFERENCES:
patent: 4277728 (1981-07-01), Stevens
patent: 4525650 (1985-06-01), Hicks et al.
patent: 5138235 (1992-08-01), Sun et al.
patent: 5258692 (1993-11-01), Jones
patent: 5262699 (1993-11-01), Sun et al.
Pascal Robert J.
Ratliff Reginald A.
Wattsmart, Inc.
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