US3919595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp ballast device
Assignee: General Electric Co
•
Filing: 1972-09-01
•
Granted: 1975-11-11
•
Expires: 1992-09-01
Abstract
Abstract A plurality of high intensity discharge lamps are operated from a high leakage reactance transformer having a magnetic shunt extending across the window of a closed magnetic core. The primary winding of the transformer is arranged on one side of the magnetic shunt and a plurality of secondary windings are arranged on the opposite side of the shunt with a gaseous discharge lamp connected to each secondary winding.
Inventors
- 👤 Jr Candler A Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:17
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/18; H01; H01F; H01F30/00; H01F30/04; H01F38/00; H01F38/08; H01F38/085; H01F38/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
96 words
Electrical ballast apparatus for operating a plurality of gaseous discharge lamps comprising, in combination, a transformer having a magnetic core providing a closed magnetic circuit, primary winding means on a first portion of said core and secondary winding means on a second portion of said core, magnetic shunt means arranged on said core between said primary winding means and said secondary winding means, said secondary winding means comprising a plurality of secondary windings on one side of said magnetic shunt means, and a plurality of gaseous discharge lamps connected respectively to said plurality of secondary windings.
Claim 2
Dependent Claim
96 words
Electrical ballast apparatus for operating a plurality of gaseous discharge lamps comprising, in combination, a transformer having a magnetic core providing a closed magnetic circuit, primary winding means on a first portion of said core and secondary winding means on a second portion of said core, magnetic shunt means arranged on said core between said primary winding means and said secondary winding means, said secondary winding means comprising a plurality of secondary windings on one side of said magnetic shunt means, and a plurality of gaseous discharge lamps connected respectively to said plurality of secondary windings.
Claim 3
Dependent Claim
100 words
Electrical ballast apparatus for operating a plurality of gaseous discharge lamps comprising, in combination, a transformer having a magnetic core providing a closed magnetic circuit, primary winding means on a first portion of said core and secondary winding means on a second portion of said core, magnetic shunt means arranged on said core between said primary winding means and said secondary winding means, said secondary winding means comprising a plurality of secondary windings, a plurality of gaseous discharge lamps connected respectively to said plurality of secondary windings, and a capacitor connected in series with each of said gaseous discharge lamps.
Claim 4
Dependent Claim
100 words
Electrical ballast apparatus for operating a plurality of gaseous discharge lamps comprising, in combination, a transformer having a magnetic core providing a closed magnetic circuit, primary winding means on a first portion of said core and secondary winding means on a second portion of said core, magnetic shunt means arranged on said core between said primary winding means and said secondary winding means, said secondary winding means comprising a plurality of secondary windings, a plurality of gaseous discharge lamps connected respectively to said plurality of secondary windings, and a capacitor connected in series with each of said gaseous discharge lamps.
Claim 5
Dependent Claim
14 words
Apparatus as defined in claim 2, said secondary windings being isolated from each other.
Claim 6
Dependent Claim
24 words
Apparatus as defined in claim 2, said core having opposite spaced legs, said primary winding means comprising coil portions wound on said spaced legs.
Claim 7
Dependent Claim
20 words
Apparatus as defined in claim 4, said secondary windings being connected to said primary winding means in autotransformer relation therewith.
Claim 8
Dependent Claim
19 words
Apparatus as defined in claim 4, said secondary windings being wound on different ones of said spaced core legs.
Claim 9
Dependent Claim
44 words
Apparatus as defined in claim 4, said secondary windings including first and second windings each having coil portions arranged on different ones of said spaced core legs, said coil portions of each of said first and second windings being interconnected in voltage aiding relation.
Claim 10
Dependent Claim
16 words
Apparatus as defined in claim 1, and a peaking capacitor connected to said secondary winding means.
Claim 11
Dependent Claim
23 words
Apparatus as defined in claim 8, said secondary winding means comprising an auxiliary winding, said peaking capacitor being connected to said auxiliary winding.
Claim 12
Dependent Claim
16 words
Apparatus as defined in claim 8, said peaking capacitor being connected across one of said lamps.
Claim 13
Dependent Claim
102 words
Electrical ballast apparatus for operating a plurality of gaseous discharge lamps comprising, in combination, a transformer having a magnetic core providing a closed magnetic circuit, primary winding means on a first portion of said core and secondary winding means on a second portion of said core, magnetic shunt means arranged on said core between said primary winding means and said secondary winding means, said secondary winding means comprising a plurality of secondary windings, and a plurality of gaseous discharge lamps connected respectively to said plurality of secondary windings, said primary winding means having three terminals for connection to a three-phase current supply.
Claim 14
Dependent Claim
102 words
Electrical ballast apparatus for operating a plurality of gaseous discharge lamps comprising, in combination, a transformer having a magnetic core providing a closed magnetic circuit, primary winding means on a first portion of said core and secondary winding means on a second portion of said core, magnetic shunt means arranged on said core between said primary winding means and said secondary winding means, said secondary winding means comprising a plurality of secondary windings, and a plurality of gaseous discharge lamps connected respectively to said plurality of secondary windings, said primary winding means having three terminals for connection to a three-phase current supply.
Claim 15
Dependent Claim
47 words
Apparatus as defined in claim 11, said transformer core comprising spaced outer legs and a central leg, said primary winding means comprising a pair of winding portions wound respectively on said spaced outer core legs, one of said winding portions being connected intermediate the other winding portion.
Claim 16
Dependent Claim
18 words
Apparatus as defined in claim 12, said plurality of secondary windings being wound on said outer core legs.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |