Patent US4027200A successfully refreshed from Google Patents.
US4027200A
Expired / Lapsed
US
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High voltage generating circuit
Assignee: Sony Corp
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Filing: 1975-10-16
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Granted: 1977-05-31
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Expires: 1995-10-16
Abstract
Abstract A high voltage generating circuit for a television receiver including a flyback transformer having primary and secondary windings which are loosely coupled to achieve substantial operational isolation therebetween. The secondary winding has a diode rectifying circuit coupled thereto for developing the high voltage signal which is applied to the anode of the television receiver. A tertiary winding is provided which is tightly coupled to the secondary winding and which has a capacitor in parallel therewith to form a resonant circuit which is resonant at a frequency somewhat higher than the horizontal sweep frequency applied to the deflection coil of the television receiver.
Inventors
- 👤 Hiroshi Sahara
- 👤 Tamiji Nagai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:55
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/19; H01; H01F; H01F38/00; H01F38/42; H01F2038/426
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
A high voltage generating circuit comprising: a horizontal oscillator developing an output signal at the horizontal sweep frequency; a flyback transformer; means for coupling the horizontal oscillator output to the primary of said flyback transformer; the primary and secondary windings of said flyback transformer being coupled loosely to provide substantial isolation therebetween; circuit means causing the input resonant frequency of said flyback transformer to be in the vicinity of and higher than the frequency of said horizontal oscillator; the secondary winding of said flyback transformer developing a substantially sinusoidal voltage having its peak portion flattened; and means associated with said secondary winding for rectifying said sinusoidal voltage to produce a regulated high voltage DC signal thereof.
Claim 2
Dependent Claim
116 words
A high voltage generating circuit comprising: a horizontal oscillator developing an output signal at the horizontal sweep frequency; a flyback transformer; means for coupling the horizontal oscillator output to the primary of said flyback transformer; the primary and secondary windings of said flyback transformer being coupled loosely to provide substantial isolation therebetween; circuit means causing the input resonant frequency of said flyback transformer to be in the vicinity of and higher than the frequency of said horizontal oscillator; the secondary winding of said flyback transformer developing a substantially sinusoidal voltage having its peak portion flattened; and means associated with said secondary winding for rectifying said sinusoidal voltage to produce a regulated high voltage DC signal thereof.
Claim 3
Dependent Claim
29 words
A high voltage generating circuit in accordance with claim 1, wherein the coupling coefficient between said primary and secondary windings is selected from the range of 0.5 to 0.9.
Claim 4
Dependent Claim
44 words
A high voltage generating circuit in accordance with claim 1, wherein said flyback transformer has a tertiary winding and wherein said circuit means comprises a capacitor connected across said tertiary winding for forming a resonant circuit, said secondary and tertiary windings being tightly coupled.
Claim 5
Dependent Claim
29 words
A high voltage generating circuit in accordance with claim 3, wherein the coupling coefficient between said secondary and tertiary windings is selected in the range of 0.9 to 1.0.
Claim 6
Dependent Claim
21 words
A high voltage generating circuit in accordance with claim 1, wherein a horizontal deflection coil is coupled to said horizontal oscillator.
Claim 7
Dependent Claim
22 words
A high voltage generating circuit in accordance with claim 5, wherein a further capacitor is coupled in parallel with said deflection coil.
Claim 8
Dependent Claim
46 words
A high voltage generating circuit in accordance with claim 1, wherein said flyback transformer has a split magnetic core, said split core being in the magnetic path between said primary and secondary windings, and a tertiary winding being wound directly in proximity with said secondary winding.
Claim 9
Dependent Claim
39 words
A high voltage generating circuit in accordance with claim 7, wherein said magnetic core is a rectangular core with said primary and secondary windings on opposite legs thereof and with said tertiary winding superimposed together with said secondary winding.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |