Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Plural periodic switches or multiple contact periodic switch
Patent
1983-05-27
1985-04-16
Dixon, Harold
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Plural periodic switches or multiple contact periodic switch
315208, 315241R, 315224, 315DIG7, H05B 3702
Patent
active
045118230
ABSTRACT:
A gas discharge lamp ballast circuit operates at high frequency and is fed from a mains supply through a rectifier having a smoothing capacitor. The invention provides for the load to include an inductor and to return to the rectifier supply at a position isolated from the smoothing capacitor by one or more diodes, and for there to be a discharge path from the smoothing capacitor through the load to charge a control capacitor, and lower the load voltage to allow a rectifier current flow to the load. The smoothing capacitor is charged by current flowing from the inductor during a relaxation phase, to a voltage higher than the peaks of the rectifier. The smoothing capacitor voltage is maintained by proportioning the control capacitor size to cause rectifier current, and not smoothing capacitor discharge, to supply circuit and load losses.
REFERENCES:
patent: 2971126 (1961-02-01), Schultz
patent: 3084283 (1963-04-01), Grunwaldt
patent: 3155875 (1964-11-01), Wenrich et al.
patent: 3753071 (1973-08-01), Engel et al.
patent: 3769545 (1973-10-01), Crane
patent: 3919592 (1975-11-01), Gray
patent: 4045711 (1977-08-01), Pitel
patent: 4170747 (1979-10-01), Holmes
patent: 4259614 (1981-03-01), Kohler
Eaton William L.
Murray Alan B.
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