US3727096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deflection driver control circuit for a television receiver
Assignee: Motorola Solutions Inc
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Filing: 1971-02-03
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Granted: 1973-04-10
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Expires: 1991-02-03
Abstract
Abstract A monolithic integrated vertical deflection coil driver circuit for a television receiver is disclosed. To permit driving of a vertical deflection coil directly from output transistors located on the monolithic integrated circuit chip, a flyback control circuit using an energy storage capacitor is employed to obtain a voltage pulse in excess of the voltage of the power supply and having sufficient energy to provide proper vertical deflection flyback. The voltage necessary to initiate flyback is low enough to be compatible with monolithic integrated circuit technology.
Inventors
- 👤 M Wilcox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:51
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/50; H03K4/501; H03K4/502; H03K4/085; H03K4/60; H03K4/69; H03K4/696; H03K4/72; H03K4/725; H03K6/00; H03K6/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
253 words
A deflection control circuit for use in a television receiver having a cathode ray tube and at least one deflection coil operated during trace and flyback intervals for deflecting a beam in the cathode ray tube, the deflection control circuit including in combination: first and second direct current voltage supply terminals; current supply means coupled between said first and second supply terminals and having an output terminal for connection to said deflection coil for supplying current to and removing current from said coil; first normally closed switch means opened in response to a control pulse; storage capacitance means having first and second end terminals; second switch means; means coupling said second switch means, the first end terminal of said storage capacitance means, the second end terminal of said storage capacitance means and said first switch means in series circuit in the order named between said first and second supply terminal to complete a charging path for said storage capacitance means; third normally open switch means coupled between said first supply terminal and the second end terminal of said storage capacitance means; said third switch means being closed in response to a control pulse; and means for applying a control pulse to said first and third switch means during said flyback intervals to open said first switch means and to close said third switch means, thereby causing the charge stored on said storage capacitance means to be increased; and means coupling the first end terminal of said storage capacitance means with said output terminal.
Claim 2
Dependent Claim
253 words
A deflection control circuit for use in a television receiver having a cathode ray tube and at least one deflection coil operated during trace and flyback intervals for deflecting a beam in the cathode ray tube, the deflection control circuit including in combination: first and second direct current voltage supply terminals; current supply means coupled between said first and second supply terminals and having an output terminal for connection to said deflection coil for supplying current to and removing current from said coil; first normally closed switch means opened in response to a control pulse; storage capacitance means having first and second end terminals; second switch means; means coupling said second switch means, the first end terminal of said storage capacitance means, the second end terminal of said storage capacitance means and said first switch means in series circuit in the order named between said first and second supply terminal to complete a charging path for said storage capacitance means; third normally open switch means coupled between said first supply terminal and the second end terminal of said storage capacitance means; said third switch means being closed in response to a control pulse; and means for applying a control pulse to said first and third switch means during said flyback intervals to open said first switch means and to close said third switch means, thereby causing the charge stored on said storage capacitance means to be increased; and means coupling the first end terminal of said storage capacitance means with said output terminal.
Claim 3
Dependent Claim
55 words
The combination according to claim 1 wherein said second switch means comprises unidirectional conductive means coupled to conduct current in the forward direction therethrough between said first supply terminal and the first end terminal of said storage capacitance means with said first switch means closed to complete the charging path for said storage capacitance means.
Claim 4
Dependent Claim
44 words
The combination according to claim 2 wherein said current supply means is coupled to said first supply terminal through said unidirectional conductive means at a junction formed by connection of said unidirectional conductive means with the first end terminal of said storage capacitance means.
Claim 5
Dependent Claim
123 words
The combination according to claim 2 wherein said storage capacitance means is a storage capacitor and said first and third switch means include first and second transistor means, respectively, each having at least collector, base, and emitter electrodes, with the collector-emitter path of said first transistor means connected in series circuit between the second end terminal of said capacitor and said second supply terminal, and with the collector-emitter path of said second transistor means being connected between said first supply terminal and the second end terminal of said capacitor, said means for applying the control pulse to said first and third switch means applying said control pulse at least to the base of said first transistor means, rendering said first transistor means nonconductive.
Claim 6
Dependent Claim
126 words
The combination according to claim 4 wherein said first and second transistor means are of the same conductivity type and further including circuit means connecting the collector of said first transistor means with the base of said second transistor means, and second unidirectional conductive means coupling the second terminal of said capacitor with the collector of said first transistor means and the base of said second transistor means, said second unidirectional conductive means being forward conductive in a direction opposite to the forward direction of conductivity of the base-emitter junction of said second transistor means; and said control pulse applying means applying said control pulse only to the base of said first transistor means, rendering said first transistor means nonconductive and said second transistor means conductive.
Claim 7
Dependent Claim
23 words
The combination according to claim 5 wherein said first and second transistor means each comprise a Darlington amplifier having at least two stages.
Claim 8
Dependent Claim
115 words
The combination according to claim 6 wherein said first voltage supply terminal supplies a potential which is positive with respect to said second voltage supply terminal and wherein said first and second transistor means comprise first and second NPN transistors, respectively, with the collector of said second transistor being connected with said first voltage supply terminal, and the emitter thereof being connected with the second end terminal of said capacitor, the collector of said first transistor being connected with the base of said second transistor and through said second unidirectional conductive means to the second end terminal of said capacitor and the emitter of said first transistor being connected with said second voltage supply terminal.
Claim 9
Dependent Claim
16 words
The combinatIon according to claim 6 wherein both of said unidirectional conducting means are diode means.
References Cited (Backward Citations)
US3602768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |