US3721858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Size and high voltage stabilizing circuit
Assignee: Sanyo Electric Co Ltd
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Filing: 1970-08-19
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Granted: 1973-03-20
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Expires: 1990-08-19
Abstract
Abstract A circuit for use in a color television receiver compensates for variations in the raster width resulting from the adjustment of the ''''Brightness'''' control and stabilizes the high voltage supply to reduce voltage variations. To this end, there is provided a control circuit for controlling the voltage to be applied to a horizontal output transistor and a detector means for detecting beam current. In alternative embodiments, there is also provided a shunt means for shunting a portion of the beam current.
Inventors
- 👤 K Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:22
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; H04N3/1856
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
186 words
A stabilizing circuit for use in a television receiver having a cathode ray tube and a flyback transformer including primary and secondary windings, comprising: detector means series connected between a power source and the low voltage terminal of the secondary winding of the flyback transformer, said detector means detecting a beam current supplied from the power source to said cathode ray tube, means for connecting the high voltage terminal of said secondary winding of the flyback transformer to the anode electrode of said cathode ray tube of said receiver, a power output transistor, and a control circuit including a control transistor connected in series in the energizing circuit from said power source to said output transistor, for controlling power supplied from the power source to said power output transistor, said control transistor being controlled by the output of said detector means to adjust the power supplied to said power output transistor from said power source as a function of the output of said detector means in response to detected variations in the level of beam current supplied from the power source to said cathode ray tube.
Claim 2
Dependent Claim
186 words
A stabilizing circuit for use in a television receiver having a cathode ray tube and a flyback transformer including primary and secondary windings, comprising: detector means series connected between a power source and the low voltage terminal of the secondary winding of the flyback transformer, said detector means detecting a beam current supplied from the power source to said cathode ray tube, means for connecting the high voltage terminal of said secondary winding of the flyback transformer to the anode electrode of said cathode ray tube of said receiver, a power output transistor, and a control circuit including a control transistor connected in series in the energizing circuit from said power source to said output transistor, for controlling power supplied from the power source to said power output transistor, said control transistor being controlled by the output of said detector means to adjust the power supplied to said power output transistor from said power source as a function of the output of said detector means in response to detected variations in the level of beam current supplied from the power source to said cathode ray tube.
Claim 3
Dependent Claim
46 words
A stabilizing circuit as recited in claim 1 wherein said cathode ray tube includes a horizontal deflection winding and wherein said power output transistor provides a deflection voltage to said horizontal deflection winding for controlling the deflection of the scanning beam of the cathode ray tube.
Claim 4
Dependent Claim
33 words
A stabilizing circuit as recited in claim 2 wherein said deflection output transistor is connected in series with the primary winding oF said flyback transformer and said control transistor to said power source.
Claim 5
Dependent Claim
67 words
A stabilizing circuit as recited in claim 2 wherein there is further provided: a drive transistor, and a high voltage output transistor connected between ground potential and through the primary winding of said flyback transformer to a power source, said high voltage and said deflection output transistors being coupled to said drive transistor to be driven in conduction in common by the output of said drive transistor.
Claim 6
Dependent Claim
42 words
A stabilizing circuit as recited in claim 1 wherein said power output transistor provides an output to the primary winding of said transformer, the secondary winding thereof providing the high voltage output for supply to the anode of the cathode ray tube.
Claim 7
Dependent Claim
33 words
A stabilizing circuit as recited in claim 5 wherein said power output transistor is connected in series with the primary winding of said flyback transformer and said control circuit to said power source.
Claim 8
Dependent Claim
64 words
A stabilizing circuit as recited in claim 6 wherein there is further provided: a deflection output transistor connected between ground potential and said power source for energizing a deflection coil of said cathode ray tube, and said high voltage and said deflection output transistors are coupled to a drive transistor to be driven in conduction in common by the output of said drive transistor.
Claim 9
Dependent Claim
32 words
A stabilizing circuit as recited in claim 1 wherein there is further provided a filter connected between said detector and said low voltage terminal of said secondary winding of said flyback transformer.
Claim 10
Dependent Claim
45 words
A stabilizing circuit as recited in claim 8 wherein: said filter comprises a resistor connected in series with said detector and said low voltage terminal of said secondary winding, and a capacitor connected between the junction of said resistor and said secondary winding and ground.
Claim 11
Dependent Claim
67 words
A stabilizing circuit as recited in claim 1 wherein: said control transistor of said control circuit is connected in its collector-emitter conducting path in series from said power source and through said primary winding of said flyback transformer to the collector-emitter conducting path of said output transistor, and said detector is connected between said power source and the base terminal of said transistor of said control circuit.
Claim 12
Dependent Claim
44 words
A stabilizing circuit as recited in claim 10 wherein there is further provided a filter circuit connected between the junction of said detector circuit and said transistor of said control circuit and the low voltage terminal of said secondary winding of said flyback transformer.
Claim 13
Dependent Claim
14 words
A stabilizing circuit as recited in claim 10 wherein said detector comprises resistive means.
Claim 14
Dependent Claim
65 words
A stabilizing circuit as recited in claim 10 wherein said detector comprises a further transistor with its collector-emitter conducting path connected between the base of the transistor of said control circuit and said power source and with its base electrode connected to said filter circuit and through further resistive means to the terminal of said control circuit connected in circuit with said output power transistor.
Claim 15
Dependent Claim
105 words
A stabilizing circuit as recited in claim 1 wherein said control circuit includes high gain amplification means responsive to the output of said detector means for generating an amplified response between the input and output terminals of said control circuit in response to variations of the beam current detected by said detector means, and there is further provided: a shunt path connected between said power source and said low voltage terminal of said secondary winding of said flyback transformer, said shunt means conducting a portion of the beam current to reduce the effective response of said detector means and prevent overcompensation by said control circuit.
Claim 16
Dependent Claim
130 words
A stabilizing circuit for use in a color television receiver comprising: a detector means for detecting a beam current supplied from a power source, oNe terminal of said detector means being connected to said power source, a flyback transformer including a secondary winding having hot and cold terminals, the hot terminal thereof being connected to the anode of a cathode ray tube of said receiver and the cold terminal thereof being connected to the other terminal of said detector means, a deflection output transistor, and a control circuit including a control transistor connected in series in the energizing circuit from said power source to said output transistor, for controlling voltage to be applied to said deflection output transistor, said control circuit being controlled by the output of said detector means.
Claim 17
Dependent Claim
130 words
A stabilizing circuit for use in a color television receiver comprising: a detector means for detecting a beam current supplied from a power source, oNe terminal of said detector means being connected to said power source, a flyback transformer including a secondary winding having hot and cold terminals, the hot terminal thereof being connected to the anode of a cathode ray tube of said receiver and the cold terminal thereof being connected to the other terminal of said detector means, a deflection output transistor, and a control circuit including a control transistor connected in series in the energizing circuit from said power source to said output transistor, for controlling voltage to be applied to said deflection output transistor, said control circuit being controlled by the output of said detector means.
Claim 18
Dependent Claim
62 words
A stabilizing circuit as recited in claim 15 wherein there is further provided: a filter connected between said other terminal of said detector means and said cold terminal of said secondary winding of said flyback transformer, said filter including a resistor for effecting said connection therebetween and a capacitor connected between the junction of said resistor and said cold terminal and ground.
Claim 19
Dependent Claim
51 words
A stabilizing circuit as recited in claim 16 wherein there is further provided shunt means connected between the power source and the cold terminal of said secondary winding in parallel with said detector means for shunting a portion of the beam current supplied by said power source from said detector means.
Claim 20
Dependent Claim
34 words
A stabilizing circuit as recited in claim 17 wherein there is further provided a unidirectionally conductive element connected in series between the other terminal of said detector means and said resistor of said filter.
Claim 21
Dependent Claim
132 words
A stabilizing circuit for use in a color television receiver comprising: a detector means for detecting a beam current supplied from a power source, one terminal of said detector means being connected to said power source, a flyback transformer including a secondary winding having hot and cold terminals, the hot terminal thereof being connected to the anode of a cathode ray tube of said receiver and the cold terminal thereof being connected to the other terminal of said detector means, a high voltage output transistor, and a control circuit including a control transistor connected in series in the energizing circuit from said power source to said output transistor, for controlling voltage to be applied to said high voltage output transistor, said control circuit being controlled by the output of said detector means.
Claim 22
Dependent Claim
132 words
A stabilizing circuit for use in a color television receiver comprising: a detector means for detecting a beam current supplied from a power source, one terminal of said detector means being connected to said power source, a flyback transformer including a secondary winding having hot and cold terminals, the hot terminal thereof being connected to the anode of a cathode ray tube of said receiver and the cold terminal thereof being connected to the other terminal of said detector means, a high voltage output transistor, and a control circuit including a control transistor connected in series in the energizing circuit from said power source to said output transistor, for controlling voltage to be applied to said high voltage output transistor, said control circuit being controlled by the output of said detector means.
Claim 23
Dependent Claim
62 words
A stabilizing circuit as recited in claim 19 wherein there is further provided: a filter connected between said other terminal of said detector means and said cold terminal of said secondary winding of said flyback transformer, said filter including a resistor for effecting said connection therebetween and a capacitor connected between the junction of said resistor and said cold terminal and ground.
Claim 24
Dependent Claim
51 words
A stabilizing circuit as recited in claim 20 wherein there is further provided shunt means connected between the power source and the cold terminal of said secondary winding in parallel with said detector means for shunting a portion of the beam current supplied by said power source from said detector means.
Claim 25
Dependent Claim
34 words
A stabilizing circuit as recited in claim 21 wherein there is further provided a unidirectionally conductive element connected in series between the other terminal of said detector means and said resistor of said filter.
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |