Electric lamp and discharge devices: systems – Condenser in the supply circuit – Arc machining
Patent
1988-03-11
1991-04-23
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Arc machining
315240, 315241R, 315243, 315244, 315307, 315291, 315DIG7, 363 59, 363 63, H05B 3700, H05B 3900/41/14
Patent
active
050102796
ABSTRACT:
Ballast and starting circuits for controlling current and voltage applied to an electrical discharge lamp. The ballast circuits use diodes or other suitable means to divide the AC power into positive and negative currents. The ballast circuits use positive and negative capacitors which are charged by the divided AC line current. In some embodiments the positively charged capacitors are charged during positive portions of alternating current and discharged during negative portions of the alternating current. The negatively charged capacitors are charged during negative portions of the alternating current and discharged during positive portions. Transistors or other appropriate switching means are used to controllably conduct current from the positive and negative capacitors to the lamp in an asynchronous manner. Startup circuits are included for boosting the voltage applied to the lamp either manually or automatically upon startup. A startup regular circuit is also shown for controlling current flow during periods of high current demand such as during startup. A further embodiment uses a modulated current control for the positive and negative sides of the ballast circuit to control power flow therethrough and maintain power dissipation across power discharge switching transistors at minimal values.
REFERENCES:
patent: 3443154 (1969-04-01), Hoekstra et al.
patent: 3579026 (1971-05-01), Paget
patent: 3591830 (1971-07-01), Woolsey
patent: 3643127 (1972-02-01), Laupman
patent: 3968400 (1976-07-01), Weinreich
patent: 4042856 (1977-08-01), Steigerwald
patent: 4132925 (1979-01-01), Schmutzer et al.
patent: 4134043 (1979-01-01), Nuver
patent: 4167689 (1979-09-01), Quirke
patent: 4219872 (1980-08-01), Engelmann
patent: 4230971 (1980-10-01), Gerhard et al.
patent: 4260932 (1981-04-01), Johnson
patent: 4289993 (1981-09-01), Harper et al.
patent: 4337417 (1982-06-01), Johnson
patent: 4340843 (1982-07-01), Anderson
patent: 4366570 (1982-12-01), Bees
patent: 4370600 (1983-01-01), Zansky
patent: 4398128 (1983-08-01), Wollank
patent: 4406976 (1983-09-01), Wisbey et al.
patent: 4506196 (1985-03-01), Bees
patent: 4555647 (1985-11-01), Leskovec et al.
patent: 4719390 (1988-01-01), Sairanen
patent: 4808886 (1989-02-01), Lathom et al.
Gullixson Bruce B.
Lathom Michael S.
Sweat Bruce P.
LaRoche Eugene R.
Shingleton Michael B.
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