Patent US3887840A successfully refreshed from Google Patents.
US3887840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-regulating line output stage
Assignee: Texas Instruments Inc
•
Filing: 1973-11-12
•
Granted: 1975-06-03
•
Expires: 1993-11-12
Abstract
Abstract Disclosed is a circuit powered from an unregulated voltage which generates television line scan deflection signals and a regulated voltage to power other circuits comprising a transistor with its input fed by variable width input pulses and its output transformer coupled to feed a storage capacitor for the regulated voltage resonant circuit including the deflection coils for scan generation, the transformer primary being connected to the collector of the transistor through a diode poled to block direct connection between the primary and secondary. Picture tube high voltage may be generated by an additional transformer secondary from the transistor or by inclusion of a transformer as part of the resonant circuit.
Inventors
- 👤 Michael John Maytum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:45
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/62; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
253 words
A television combination circuit for generating a stabilized voltage for the operation of other circuits and line scan deflection signals for the deflection coils of a cathode ray tube, including a transistor, the collector of which is connected to a voltage supply through the primary winding of a transformer, and the emitter of which is connected to a reference potential, means for applying a rectangular waveform to the base of the transistor to render it alternately conducting and nonconducting, a conductor connected to the collector of the transistor through a first diode poled to pass current through the transistor when it is conducting, the conductor being connected separately through a resonant circuit and a second diode to the reference potential, the resonant circuit having inductive means including the deflection coils connecting the conductor to a storage capacitor connected to the reference potential and another capacitor connected from the conductor to the reference potential, and the second diode being poled so that current through it will also pass through the first diode; wherein the secondary winding of the transformer is connected in series with a third diode in a path from the reference potential to the storage capacitor to transfer to that capacitor the energy stored in the transformer while the transistor is conducting, and a fourth diode is connected between the primary winding of the first transformer and the collector electrode of the transistor to block connection of the primary and secondary windings of the transformer together through the first and third diodes.
Claim 2
Dependent Claim
253 words
A television combination circuit for generating a stabilized voltage for the operation of other circuits and line scan deflection signals for the deflection coils of a cathode ray tube, including a transistor, the collector of which is connected to a voltage supply through the primary winding of a transformer, and the emitter of which is connected to a reference potential, means for applying a rectangular waveform to the base of the transistor to render it alternately conducting and nonconducting, a conductor connected to the collector of the transistor through a first diode poled to pass current through the transistor when it is conducting, the conductor being connected separately through a resonant circuit and a second diode to the reference potential, the resonant circuit having inductive means including the deflection coils connecting the conductor to a storage capacitor connected to the reference potential and another capacitor connected from the conductor to the reference potential, and the second diode being poled so that current through it will also pass through the first diode; wherein the secondary winding of the transformer is connected in series with a third diode in a path from the reference potential to the storage capacitor to transfer to that capacitor the energy stored in the transformer while the transistor is conducting, and a fourth diode is connected between the primary winding of the first transformer and the collector electrode of the transistor to block connection of the primary and secondary windings of the transformer together through the first and third diodes.
Claim 3
Dependent Claim
253 words
A television combination circuit for generating a stabilized voltage for the operation of other circuits and line scan deflection signals for the deflection coils of a cathode ray tube, including a transistor, the collector of which is connected to a voltage supply through the primary winding of a transformer, and the emitter of which is connected to a reference potential, means for applying a rectangular waveform to the base of the transistor to render it alternately conducting and nonconducting, a conductor connected to the collector of the transistor through a first diode poled to pass current through the transistor when it is conducting, the conductor being connected separately through a resonant circuit and a second diode to the reference potential, the resonant circuit having inductive means including the deflection coils connecting the conductor to a storage capacitor connected to the reference potential and another capacitor connected from the conductor to the reference potential, and the second diode being poled so that current through it will also pass through the first diode; wherein the secondary winding of the transformer is connected in series with a third diode in a path from the reference potential to the storage capacitor to transfer to that capacitor the energy stored in the transformer while the transistor is conducting, and a fourth diode is connected between the primary winding of the first transformer and the collector electrode of the transistor to block connection of the primary and secondary windings of the transformer together through the first and third diodes.
Claim 4
Dependent Claim
253 words
A television combination circuit for generating a stabilized voltage for the operation of other circuits and line scan deflection signals for the deflection coils of a cathode ray tube, including a transistor, the collector of which is connected to a voltage supply through the primary winding of a transformer, and the emitter of which is connected to a reference potential, means for applying a rectangular waveform to the base of the transistor to render it alternately conducting and nonconducting, a conductor connected to the collector of the transistor through a first diode poled to pass current through the transistor when it is conducting, the conductor being connected separately through a resonant circuit and a second diode to the reference potential, the resonant circuit having inductive means including the deflection coils connecting the conductor to a storage capacitor connected to the reference potential and another capacitor connected from the conductor to the reference potential, and the second diode being poled so that current through it will also pass through the first diode; wherein the secondary winding of the transformer is connected in series with a third diode in a path from the reference potential to the storage capacitor to transfer to that capacitor the energy stored in the transformer while the transistor is conducting, and a fourth diode is connected between the primary winding of the first transformer and the collector electrode of the transistor to block connection of the primary and secondary windings of the transformer together through the first and third diodes.
Claim 5
Dependent Claim
214 words
A television combination circuit for generating a stabilized voltage for the operation of other circuits and line scan deflection signals for the deflection coils of a cathode ray tube, including a transistor, the collector of which is connected to a voltage supply through the primary winding of a transformer, and the emitter of which is connected to a reference potential, means for applying a rectangular waveform to the base of the transistor to render it alternately conducting and nonconducting, a conductor connected to the collector of the transistor through a first diode poled to pass current through the transistor when it is conducting, the conductor being connected separately through a resonant circuit and a second diode to the reference potential, the resonant circuit having inductive means including the deflection coils connecting the conductor to a storage capacitor cOnnected to the reference potential and another capacitor connected from the conductor to the reference potential, and the second diode being poled so that current through it will also pass through the first diode; wherein the secondary winding of the transformer is connected in series with a third diode in a path from the reference potential directly to the storage capacitor to transfer to that capacitor the energy stored in the transformer whilst the transistor is conducting.
Claim 6
Dependent Claim
214 words
A television combination circuit for generating a stabilized voltage for the operation of other circuits and line scan deflection signals for the deflection coils of a cathode ray tube, including a transistor, the collector of which is connected to a voltage supply through the primary winding of a transformer, and the emitter of which is connected to a reference potential, means for applying a rectangular waveform to the base of the transistor to render it alternately conducting and nonconducting, a conductor connected to the collector of the transistor through a first diode poled to pass current through the transistor when it is conducting, the conductor being connected separately through a resonant circuit and a second diode to the reference potential, the resonant circuit having inductive means including the deflection coils connecting the conductor to a storage capacitor cOnnected to the reference potential and another capacitor connected from the conductor to the reference potential, and the second diode being poled so that current through it will also pass through the first diode; wherein the secondary winding of the transformer is connected in series with a third diode in a path from the reference potential directly to the storage capacitor to transfer to that capacitor the energy stored in the transformer whilst the transistor is conducting.
Claim 7
Dependent Claim
20 words
A circuit according to claim 1, wherein the secondary winding of the transformer has more turns than its primary winding.
Claim 8
Dependent Claim
20 words
A circuit according to claim 2, wherein the secondary winding of the transformer has fewer turns than its primary winding.
Claim 9
Dependent Claim
43 words
A circuit according to claim 1, in which the inductive means includes the primary winding of a second transformer, shunted by the deflection coils in series with a further capacitor, there being provided a secondary winding on the second transformer for generating E.H.T.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |