US3793482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television line oscillator and line driver circuit arrangements
Assignee: US Philips Corp
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Filing: 1972-07-10
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Granted: 1974-02-19
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Expires: 1992-07-10
Abstract
Abstract A power supply for a low voltage television line oscillator is derived from a D.C. load to the line dirver stage, a winding coupled to the driver transformer providing an additional supply coupled to the D.C. load.
Inventors
- 👤 D Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:51
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/62; H03K4/64; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/601
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
121 words
A circuit arrangement comprising the line oscillator and line driver circuits of a television receiver in which said line driver circuit is adapted to be energised from a supply having a voltage substantially higher than that required for said line oscillator circuit, said driver circuit comprising a driver transformer and a transistor having a pair of conduction electrodes, a d.c. load decoupled at line frequency being connected between one terminal for said supply and one of said conduction electrodes, a further d.c. supply of a voltage lower than said first mentioned supply and derived from a winding on the driver transformer of said driving circuit being applied across said d.c. load from which load said line oscillator circuit derives its supply.
Claim 2
Dependent Claim
121 words
A circuit arrangement comprising the line oscillator and line driver circuits of a television receiver in which said line driver circuit is adapted to be energised from a supply having a voltage substantially higher than that required for said line oscillator circuit, said driver circuit comprising a driver transformer and a transistor having a pair of conduction electrodes, a d.c. load decoupled at line frequency being connected between one terminal for said supply and one of said conduction electrodes, a further d.c. supply of a voltage lower than said first mentioned supply and derived from a winding on the driver transformer of said driving circuit being applied across said d.c. load from which load said line oscillator circuit derives its supply.
Claim 3
Dependent Claim
67 words
A circuit arrangement as claimed in claim 1, in which said line driver transformer has a primary connected between a second terminal for said higher voltage supply and the collector of said transistor, said transformer being additionally provided with a first secondary for providing line drive to a line output circuit and a further secondary which forms the winding from which said lower voltage supply is derived.
Claim 4
Dependent Claim
25 words
A circuit arrangement as claimed in claim 2, in which a diode is connected between one end of said further secondary and said d.c. load.
Claim 5
Dependent Claim
15 words
A circuit as claimed in claim 1 wherein said one conduction electrode comprises an emitter.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |