US3706023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage regulation circuit for television receiver
Assignee: Toshiba Corp
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Filing: 1970-10-01
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Granted: 1972-12-12
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Expires: 1990-10-01
Abstract
Abstract A high voltage regulation circuit in a high voltage power supply circuit for a television receiver in which a transistorized horizontal deflection circuit is connected to the primary winding of a flyback transformer is disclosed, said regulation circuit comprising a diode and a capacitor connected to the primary winding, and means for controlling the amount of discharge from said capacitor depending upon the current load change in the high voltage power supply circuit mainly during a tract period, whereby the variation of high voltage due to the load variation in the high voltage power supply circuit is prevented and stabilized high voltage is produced.
Inventors
- 👤 Hisashi Yamada
- 👤 Hisao Tajiri
- 👤 Mitsugu Nishizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:29
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
153 words
A high voltage regulation circuit for use in a high voltage power supply circuit for supplying high voltage to a television receiver tube comprising a flyback transformer, a semiconductor horizontal deflection circuit connected to the primary winding of said flyback transformer for supplying flyback pulses to the primary winding and a step-up rectifying circuit for said flyback pulses to supply high voltage to said receiver tube; said regulation circuit including a first diode for rectifying the flyback pulses on the primary winding, a first capacitor connected in substantially parallel with said deflection circuit and charged by the rectified voltage, a semiconductor device connected in parallel with the first capacitor and a control circuit for said semiconductor device for detecting the current flowing through the primary winding during retrace periods and controlling the conductivity of said semiconductor device in response to the detected signal to control the amount of discharge from the first capacitor.
Claim 2
Dependent Claim
153 words
A high voltage regulation circuit for use in a high voltage power supply circuit for supplying high voltage to a television receiver tube comprising a flyback transformer, a semiconductor horizontal deflection circuit connected to the primary winding of said flyback transformer for supplying flyback pulses to the primary winding and a step-up rectifying circuit for said flyback pulses to supply high voltage to said receiver tube; said regulation circuit including a first diode for rectifying the flyback pulses on the primary winding, a first capacitor connected in substantially parallel with said deflection circuit and charged by the rectified voltage, a semiconductor device connected in parallel with the first capacitor and a control circuit for said semiconductor device for detecting the current flowing through the primary winding during retrace periods and controlling the conductivity of said semiconductor device in response to the detected signal to control the amount of discharge from the first capacitor.
Claim 3
Dependent Claim
81 words
The high voltage regulation circuit for use in a television receiver according to claim 1 wherein said semiconductor device is a transistor, and a voltage difference between a voltage drop across the current detecting resistor inserted in the primary winding of the flyback transformer and at least a portion of the rectified and filtered voltage of a fraction of the primary voltage of the flyback transformer is applied to the base of said transistor to control the conductivity of said transistor.
Claim 4
Dependent Claim
72 words
The high voltage regulation circuit for use in a television receiver according to claim 1 further including a charge/discharge circuit comprising a second capacitor connected through said first diode and a second diode to said second capacitor in such a polarity that the charge of the second capacitor charged by the flyback pulses is discharged through the primary winding of said flyback transformer during a later half of the flyback pulse period.
Claim 5
Dependent Claim
30 words
The high voltage regulation circuit for use in a television receiver according to claim 2 wherein said control circuit includes a VDR (voltage dependent resistor) as a current detecting resistor.
References Cited (Backward Citations)
US2667614A
Cited
US2748336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |