US3898522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television receiver power supply system and protective circuitry therefor
Assignee: GTE Sylvania Inc
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Filing: 1973-12-03
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Granted: 1975-08-05
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Expires: 1993-12-03
Abstract
Abstract A system of interdependent power supplies for a television receiver is disclosed. A first power supply provides an energization voltage to deflection apparatus that includes an output transformer. Additional voltages are developed by dependent power supplies which rectify voltages developed in primary or secondary windings on the output transformer. At least one of the dependent power supplies includes protective circuitry to disable the deflection apparatus when excessive current is drawn from that power supply. In addition, protective circuitry associated with the power supply for energizing the deflection apparatus utilizes common circuitry to disable the deflection apparatus in response to excessive voltages from that power supply.
Inventors
- 👤 Arthur Harold Klein
- 👤 Robert Charles Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:20
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/20; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/085
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
137 words
In a television receiver having an image display device and deflection apparatus associated therewith, said deflection apparatus including a deflection circuit and an output transformer connected thereto, power supply means comprising: means connected to said deflection apparatus for providing energizing voltage to said deflection apparatus; a winding on said output transformer; rectifying means connected to said winding for providing a unidirectional voltage by rectification of pulses from said winding during the trace portion of the scanning of said image display device; current sensing means connected to said rectifying means for providing an output signal indicative of current flow through said rectifying means in excess of a predetermined magnitude; and switching means connected to said current sensing means and to said deflection circuit for switching said deflection circuit to an inoperative condition in response to said output signal.
Claim 2
Dependent Claim
137 words
In a television receiver having an image display device and deflection apparatus associated therewith, said deflection apparatus including a deflection circuit and an output transformer connected thereto, power supply means comprising: means connected to said deflection apparatus for providing energizing voltage to said deflection apparatus; a winding on said output transformer; rectifying means connected to said winding for providing a unidirectional voltage by rectification of pulses from said winding during the trace portion of the scanning of said image display device; current sensing means connected to said rectifying means for providing an output signal indicative of current flow through said rectifying means in excess of a predetermined magnitude; and switching means connected to said current sensing means and to said deflection circuit for switching said deflection circuit to an inoperative condition in response to said output signal.
Claim 3
Dependent Claim
34 words
Power supply means as defined in claim 1 wherein said current sensing means includes a transistor biased to conduct in response to current flow through said rectifying means in excess of a predetermined magnitude.
Claim 4
Dependent Claim
35 words
Power supply means as defined in claim 2 wherein said current sensing means further includes a filter capacitor connected in circuit with said transistor for preventing conduction thereby during initial operation of the television receiver.
Claim 5
Dependent Claim
49 words
Power supply means as defined in claim 1 wherein said deflection circuit includes an oscillator and a driver transistor connected thereto and said switching means includes a controlled rectifier for switching said driver transistor to an inoperative condition in response to said output signal from said current sensing means.
Claim 6
Dependent Claim
78 words
Power supply means as defined in claim 4 wherein said means for providing energizing power to said deflection apparatus is a regulated power supply including voltage sensing means for providing an output signal in response to voltages from said regulated power supply exceeding a threshold, and means connecting said voltage sensing means to said controlled rectifier, said controlled rectifier switching said driver transistor to an inoperative condition in response to said output signal from said voltage sensing means.
Claim 7
Dependent Claim
127 words
In a television receiver having a cathode ray tube and horizontal and vertical deflection apparatus associated therewith, said horizontal deflection apparatus including a deflection circuit and an output transformer connected thereto, power supply means comprising: a regulated power supply connected to said horizontal deflection apparatus for providing an energization voltage thereto; a winding on said output transformer; rectifying means connected to said winding for providing a unidirectional voltage in response to signals from said winding; current sensing means connected to said rectifying means for providing an output signal indicative of current flow through said rectifying means in excess of a predetermined magnitude; and switching means connected to said current sensing means and to said deflection circuit for disabling said deflection circuit in response to said output signal.
Claim 8
Dependent Claim
127 words
In a television receiver having a cathode ray tube and horizontal and vertical deflection apparatus associated therewith, said horizontal deflection apparatus including a deflection circuit and an output transformer connected thereto, power supply means comprising: a regulated power supply connected to said horizontal deflection apparatus for providing an energization voltage thereto; a winding on said output transformer; rectifying means connected to said winding for providing a unidirectional voltage in response to signals from said winding; current sensing means connected to said rectifying means for providing an output signal indicative of current flow through said rectifying means in excess of a predetermined magnitude; and switching means connected to said current sensing means and to said deflection circuit for disabling said deflection circuit in response to said output signal.
Claim 9
Dependent Claim
60 words
Power supply means as defined in claim 6 wherein said regulated power supply includes voltage sensing means for providing an output signal in response to a voltage in excess of a predetermined magnitude, and means connecting said voltage sensing means to said switching means for disabling said deflection circuit in response to said output signal from said voltage sensing means.
Claim 10
Dependent Claim
33 words
Power supply means as defined in claim 7 wherein said switching means includes a controlled rectifier connected to become conductive in response to said output signals from said current and voltage sensing means.
Claim 11
Dependent Claim
38 words
POwer supply means as defined in claim 8 wherein said deflection circuit includes a driver transistor and said controlled rectifier is connected thereto to switch said driver transistor to an inoperative condition in response to said output signals.
Claim 12
Dependent Claim
57 words
Power supply means as defined in claim 6 wherein said current sensing means includes a current sensing resistor connected in series with said rectifying means and a transistor having a base and emitter circuit connected in parallel with said current sensing resistor for becoming conductive when the current through said current sensing resistor exceeds said predetermined magnitude.
Claim 13
Dependent Claim
39 words
Power supply means as defined in claim 10 wherein said current sensing means further includes a filter capacitor connected between the base and emitter of said last-named transistor for preventing conduction thereby during initial operation of the television receiver.
Claim 14
Dependent Claim
33 words
Power supply means as defined in claim 11 wherein said rectifying means conducts current in response to pulses from said winding during the trace portion of the scanning of said cathode ray tube.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |