Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1991-01-04
1991-11-05
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315209R, 315307, 315DIG7, H05B 4136
Patent
active
050633317
ABSTRACT:
A rectifier bridge includes two pairs of diodes, each pair connected to opposing ends of the secondary winding of a boost transformer whose primary winding is in series with the secondary winding of a high frequency DC/AC inverter circuit output transformer which is connected to ballasting capacitors in a fluorescent lamp receiving circuit. The bridge output charges a smoothing DC supply capacitor whose voltage is boosted by a pair of capacitors charged by the boost transformer whose inductance determines that the zero portion of the incoming line current waveform is boosted. The line voltage peaks are uncorrected. In a second embodiment both the peak region and the zero crossing region of the incoming line current waveform are corrected by deriving a portion of the boost voltage from the load circuit and a portion from the inverter circuit.
REFERENCES:
patent: 3969652 (1976-07-01), Herzog
patent: 4109307 (1978-08-01), Knoll
patent: 4484108 (1984-11-01), Stupp et al.
patent: 4503361 (1985-03-01), Hanlet
patent: 4513226 (1985-04-01), Josephson
patent: 4560908 (1985-12-01), Stupp et al.
patent: 4782268 (1988-11-01), Fabnrich et al.
patent: 5001400 (1991-03-01), Nilssen
R. P. Severns & G. E. Bloom, Modern DC-to-DC Switchmode Power Converter Circuit, 1984, pp. 52-55 and pp. 120-121.
LaRoche Eugene R.
Neyzari Ali
North American Philips Corporation
Squire William
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