US3745246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage producing circuit for television receivers
Assignee: Victor Company of Japan Ltd
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Filing: 1972-04-03
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Granted: 1973-07-10
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Expires: 1992-04-03
Abstract
Abstract A high voltage producing circuit for television receivers wherein a voltage-dependent non-linear element is disposed between a circuit for detecting variations in the value of a picture tube current and a control circuit adapted to cause variations to occur in a direct current voltage supply from a direct current source to a flyback transformer upon receipt of output from the detection circuit so as to vary non-linearly the value of the direct current voltage supply to a circuit for supplying pulses to the flyback transformer with respect to a variation in the value of the picture tube current whereby the slope of the characteristics curve of the output of high voltage of the high voltage producing circuit with respect to the picture tube current can be reduced.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:14
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185; H04N3/1856
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
226 words
A high voltage producing circuit for television receivers comprising a pulse supply circuit receiving a supply of drive pulses for performing a switching operation and producing flyback pulses, a direct current source for supplying a direct current voltage to said pulse supply circuit, a flyback transformer for increasing the voltage of said flyback pulses, rectifier means for rectifying the output voltage of said flyback transformer, a high voltage output terminal through which a rectified output of high voltage is transmitted to a picture tube, a detection circuit adapted to detect a variation in the value of a picture tube current supplied through said high voltage output terminal to the picture tube and produce a direct current voltage of the value corresponding to the variation in the value of the picture tube current, and a control circuit comprising at least one voltage-dependent non-linear element adapted to receive a supply of the direct current voltage produced by said detection circuit and vary the value of the direct current voltage supplied from said direct current source to said pulse producing circuit, said control circuit being constructed and operating such that the direct current voltage supplied to the pulse supply circuit from the direct current source undergoes a non-linear variation in value with respect to a variation in the value of the direct current voltage produced by the detection circuit.
Claim 2
Dependent Claim
226 words
A high voltage producing circuit for television receivers comprising a pulse supply circuit receiving a supply of drive pulses for performing a switching operation and producing flyback pulses, a direct current source for supplying a direct current voltage to said pulse supply circuit, a flyback transformer for increasing the voltage of said flyback pulses, rectifier means for rectifying the output voltage of said flyback transformer, a high voltage output terminal through which a rectified output of high voltage is transmitted to a picture tube, a detection circuit adapted to detect a variation in the value of a picture tube current supplied through said high voltage output terminal to the picture tube and produce a direct current voltage of the value corresponding to the variation in the value of the picture tube current, and a control circuit comprising at least one voltage-dependent non-linear element adapted to receive a supply of the direct current voltage produced by said detection circuit and vary the value of the direct current voltage supplied from said direct current source to said pulse producing circuit, said control circuit being constructed and operating such that the direct current voltage supplied to the pulse supply circuit from the direct current source undergoes a non-linear variation in value with respect to a variation in the value of the direct current voltage produced by the detection circuit.
Claim 3
Dependent Claim
86 words
A high voltage producing circuit as set forth in claim 1 wherein said control circuit further comprises a first transistor, a collector of which is connected to said direct current source and an emitter of which is connected to said pulse producing circuit, and a second transistor, a collector of which is connected to a base of the first transistor and an emitter of which is connected to ground, said voltage-dependent non-linear element being connected between a base of said second transistor and said detection circuit.
Claim 4
Dependent Claim
106 words
A high voltage producing circuit as set forth in claim 1 wherein said control circuit further comprises a first transistor comprising a collector connected to said direct current source and an emitter connected to said pulse supply circuit, a second transistor having a collector connected to a base of said first transistor, an emitter connected to ground and a base connected to said detection circuit, and a third transistor having a collector connected to the collector of said second transistor and an emitter connected to ground, and a resistor between the collector and the emitter of said third transistor is used as the voltage-dependent non-linear element.
Claim 5
Dependent Claim
83 words
A high voltage producing circuit as set forth in claim 1 wherein said control circuit further comprises a first transistor comprising a collector connected to said direct current source and an emitter connected to said pulse supply circuit, and a second transistor having a collector connected to a base of said first transistor, an emitter connected to ground and a base connected to said detection circuit, said voltage-dependent non-linear element being connected in series between the emitter of said second transistor and ground.
Claim 6
Dependent Claim
44 words
A high voltage producing circuit as set forth in claim 1 wherein said direct current source and said pulse supply circuit are connected in series with each other, and said control circuit is connected substantially in series between said pulse supply circuit and ground.
Claim 7
Dependent Claim
45 words
A high voltage producing circuit as set forth in claim 5 wherein said control circuit comprises a transistor comprising a collector connected to said pulse supply circuit, an emitter connected to ground and a base connected to said detection circuit through said voltage-dependent non-linear element.
References Cited (Backward Citations)
US3585299A
Cited
US3611002A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |