Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1994-04-15
1996-04-23
Gonzalez, Frank
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315223, 315289, 315DIG5, 315DIG7, H05B 3702
Patent
active
055106811
ABSTRACT:
A half-bridge inverter is powered from a constant-magnitude DC supply voltage and provides at the inverter's output a first AC output voltage that is describable as a modified squarewave voltage. This first AC voltage is applied across a series-combination of an inductor and a capacitor, the junction between which is clamped to the DC supply voltage. As a result, a second AC voltage gets established across the capacitor; which second AC voltage is also describable as being a modified squarewave voltage. However, the phasing of the second AC voltage is delayed by approximately 90 degrees with respect to the first AC voltage; which results in the voltage across the inductor being of approximately sinusoidal waveform. A fluorescent lamp is connected in series with a ballast capacitor; and the lamp-capacitor series combination is connected across the inductor, thereby resulting in a nearly sinusoidal current being provided to the fluorescent lamp. Lamp starting aid is provided by a voltage-doubling circuit supplying a high-magnitude current-limited DC voltage across the ballast capacitor for ignition purposes.
REFERENCES:
patent: 3740609 (1973-06-01), Moerkens
patent: 3986076 (1976-10-01), Rottier
patent: 4259616 (1981-03-01), Smith
patent: 4277728 (1981-07-01), Stevens
patent: 4442380 (1984-04-01), Adachi
patent: 4469981 (1984-09-01), Ruff et al.
patent: 5008596 (1991-04-01), Kastl et al.
patent: 5034661 (1991-07-01), Sakurai et al.
Gonzalez Frank
Ratliff Reginald A.
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