US3579026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp ballast
Assignee: GTE Sylvania Inc
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Filing: 1969-01-02
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Granted: 1971-05-18
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Expires: 1989-01-02
Abstract
Abstract A solid-state ballast for an electric discharge lamp, the ballast including an unfiltered full-wave rectifier, a transistor inverter for increasing the frequency and a transformer for coupling the lamp.
Inventors
- 👤 Frederick W Paget
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:11
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/26; H05B41/28; H05B41/282; H05B41/2821; Y; Y10; Y10S; Y10S315/00; Y10S315/07
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
An electric discharge lamp circuit operating from an alternating current line, said circuit comprising: a full-wave rectifier for supplying a substantially unfiltered rectified direct current means to an inverter; an inverter to which said wave is applied, the output frequency of the inverter being substantially higher than that of the alternating current line said inverter including two transistors connected in push-pull; a transformer for coupling at least one fluorescent lamp to the output of said inverter; and input and output circuits of said inverter being coupled through a coil together to produce oscillation at a frequency substantially higher than that of the alternating current line, and an inductance to short circuit said coil when the transistors are not carrying current.
Claim 2
Dependent Claim
120 words
An electric discharge lamp circuit operating from an alternating current line, said circuit comprising: a full-wave rectifier for supplying a substantially unfiltered rectified direct current means to an inverter; an inverter to which said wave is applied, the output frequency of the inverter being substantially higher than that of the alternating current line said inverter including two transistors connected in push-pull; a transformer for coupling at least one fluorescent lamp to the output of said inverter; and input and output circuits of said inverter being coupled through a coil together to produce oscillation at a frequency substantially higher than that of the alternating current line, and an inductance to short circuit said coil when the transistors are not carrying current.
Claim 3
Dependent Claim
33 words
The circuit of claim 6, in which the alternating current line has a frequency of about 60 cycles per second, and the output frequency of the inverter is above 8,000 kilocycles per second.
Claim 4
Dependent Claim
36 words
The circuit of claim 6 in which the transformer is of the pot type and has an annular magnetic ring between one of the coils and the remainder to provide a shunt path for leakage reactance.
Claim 5
Dependent Claim
14 words
The circuit of claim 6, in which the inverter is a push-pull transistor oscillator.
Claim 6
Dependent Claim
22 words
The circuit of claim 6, in which there is a small inductance in series with the alternating current line and the rectifier.
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |