Ballast modifying device and lead-type ballast for programming a

Details Ballast modifying device and lead-type ballast for programming a Ballast modifying device and lead-type ballast for programming a

1983-08-10

1985-02-26

Dixon, Harold

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 315247, 315287, 315308, H05B 3702

Patent

active

045019940

ABSTRACT:
Lead-type ballast apparatus operable to program and control the operating performance of a high-intensity-discharge sodium lamp. The basic lead-type ballast comprises a current-limiting high-reactance transformer having a capacitor connected between the transformer output terminals and the lamp to be operated. A pulse-generating means is normally associated with the transformer secondary and is operable to generate high-voltage pulses when the apparatus is energized which are applied through the capacitor to initiate a discharge within the lamp. There is also provided an additional inductor which is connected in circuit in one of (1) a parallel connection across the capacitor and (2) a connection across the transformer secondary. An "open or closed" switch connects in circuit with the additional inductor. A sensing and programming means operates to sense at least one lamp operating parameter to control the proportion of time the switch is open and closed, in order to vary the current input to the lamp. Any of a variety of lamp operating parameters may be sensed in order to control any of a plurality of desired lamp operating parameters.

REFERENCES:
patent: 3015058 (1961-12-01), Popa
patent: 3344311 (1967-09-01), Nuckolls
patent: 3590316 (1971-06-01), Engel
patent: 3599037 (1971-08-01), Grace
patent: 3689752 (1972-09-01), Gilbert
patent: 3886405 (1975-05-01), Kubo
patent: 4162428 (1979-07-01), Elms
patent: 4162429 (1979-07-01), Elms et al.
patent: 4292570 (1981-09-01), Engel
patent: 4350934 (1982-09-01), Spreadbury

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