Electric lamp and discharge devices: systems – Discharge device and/or rectifier in the supply circuit – Plural discharge devices and/or rectifiers in the supply...
Patent
1977-06-27
1978-08-15
Smith, Alfred E.
Electric lamp and discharge devices: systems
Discharge device and/or rectifier in the supply circuit
Plural discharge devices and/or rectifiers in the supply...
315206, 315207, 315DIG5, 315DIG7, 315276, H05B 3700
Patent
active
041075790
ABSTRACT:
The HID lamp starting and operating apparatus of the invention includes inductive ballast means containing a winding and a core of magnetic material which may form a reactor or a transformer, and such winding is adapted for connection in circuit with an HID lamp; source means for supplying a cyclically varying AC voltage to said ballast means so as to provide AC voltage across said winding; first semiconductor switch means and a first capacitor means are coupled in circuit to said winding, responsive to said voltage across said lamp attaining a first predetermined instantaneous AC level, possible only during the time period before the lamp starts, for discharging the capacitor means through at least a portion of said winding at least once in each cycle of AC voltage to thereby generate high voltage pulses across said lamp and further responsive to said lamp being in the operating condition for terminating such capacitor discharging function; and second semiconductor switching means, including timing means associated therewith, said second switching means being responsive to application of said AC source to the ballast means for disabling said first switch means subsequent to the lapse of a predetermined interval subsequent to said application of said AC source, said second switch means being automatically resettable upon the disconnection of said AC source from the ballast means.
REFERENCES:
patent: 3374396 (1968-03-01), Bell et al.
patent: 3407334 (1968-10-01), Attewell
patent: 3679936 (1972-07-01), Moerkens
patent: 3699385 (1972-10-01), Paget
patent: 3889152 (1975-06-01), Bodine et al.
patent: 3924155 (1975-12-01), Vogeli
Bodine, Jr. Richard Hill
Rosiak Marion
Bodine Co., Inc.
Goldman Ronald M.
Litton Systems Inc.
Roberts Charles F.
Smith Alfred E.
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