Patent US3920892A successfully refreshed from Google Patents.
US3920892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternating current line voltage supply isolation using deflection system output transformer
Assignee: RCA Licensing Corp
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Filing: 1974-04-12
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Granted: 1975-11-18
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Expires: 1994-04-12
Abstract
Abstract A dual bidirectional switch television receiver deflection system with high power handling capability utilizes the deflection system output transformer to provide isolation of the receiver chassis from the alternating current line-derived reference potential. Power supplies referenced to the receiver chassis are derived from secondary windings of the output transformer. One of the secondary windings drives the deflection winding. Voltage variations induced in the deflection winding are thus referenced to the chassis potential. In a second embodiment one of the bidirectional switches is also placed in the secondary winding containing the deflection winding.
Inventors
- 👤 Wolfgang Friedrich Wilhe Dietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:05
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/83; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
189 words
A system for isolating a source of reference potential within a television receiver from the alternating current line voltage source from which power for said receiver is derived, comprising: first and second terminals; rectifying, filtering and storage means coupled to said terminals and to said alternating current line voltage source for rectifying, filtering and storing said alternating current line voltage to provide at said first terminal a first direct current voltage supply with respect to said second terminal; switching means including first and second bidirectionally conductive switches coupled to a deflection winding for generating deflection current in said deflection winding, said first switch being direct current coupled to said first and second terminals; a first winding coupled to said switching means for having induced therein current flow in response to operation of said switching means; and a second winding magnetically coupled to said first winding and electrically isolated therefrom for having induced therein voltage variations in response to said current flow in said first winding, said second winding being coupled to said source of reference potential for having said voltage variations induced therein with reespect to said reference potential.
Claim 2
Independent Claim
189 words
A system for isolating a source of reference potential within a television receiver from the alternating current line voltage source from which power for said receiver is derived, comprising: first and second terminals; rectifying, filtering and storage means coupled to said terminals and to said alternating current line voltage source for rectifying, filtering and storing said alternating current line voltage to provide at said first terminal a first direct current voltage supply with respect to said second terminal; switching means including first and second bidirectionally conductive switches coupled to a deflection winding for generating deflection current in said deflection winding, said first switch being direct current coupled to said first and second terminals; a first winding coupled to said switching means for having induced therein current flow in response to operation of said switching means; and a second winding magnetically coupled to said first winding and electrically isolated therefrom for having induced therein voltage variations in response to said current flow in said first winding, said second winding being coupled to said source of reference potential for having said voltage variations induced therein with reespect to said reference potential.
Claim 3
Dependent Claim
39 words
A system for isolating a source of reference potential from an alternating current line voltage source according to claim 1 wherein said first and second switches are each direct current coupled to one of said first and second terminals.
Claim 4
Dependent Claim
55 words
A system for isolating a source of reference potential from an alternating current line voltage source according to claim 1 wherein said first and second switches are coupled to each other by said first and second electrically isolated windings, said first and second windings being primary and secondary windings respectively of a deflection output transformer.
Claim 5
Dependent Claim
38 words
A system according to claim 3 wherein the leakage inductance between said first winding and said second winding provides series inductance between said first and second bidirectionally conductive switches for the operation of said first and second switches.
Claim 6
Dependent Claim
34 words
A system for isolating a source of reference potential from an alternating current line voltage source according to claim 1 wherein said deflection winding is coupled to said second winding for being energized therefrom.
Claim 7
Dependent Claim
54 words
A system for isolating a source of reFerence potential from an alternating current line voltage source according to claim 1 wherein second rectifying means are coupled to said second winding for rectifying said voltage variations in said second winding with respect to said reference potential and for supplying said rectified variations to said receiver.
Claim 8
Independent Claim
203 words
A system for isolating a source of reference potential within a television receiver from the alternating current line voltage source from which power for said receiver is derived, comprising: first and second terminals; rectifying and filtering means coupled to said terminals and to said alternating current line voltage source for providing at said first terminal a first direct current voltage supply with respect to said second terminal; switching means including first and second bidirectionally conductive switches coupled to a deflection winding for generating deflection current in said deflection winding, said first switch being direct current coupled to said first and second terminals; a first winding coupled to said switching means for having induced therein current flow in response to operation of said switching means; and at least a second winding magnetically coupled to said first winding and electrically isolated therefrom for having induced therein voltage variations in response to said current flow in said first winding, said second winding being coupled to said source of reference potential for having said voltage variations induced therein with respect to said reference potential, said second winding also being coupled to said deflection winding for inducing said deflection current flow therein in response to said voltage variations.
Claim 9
Independent Claim
203 words
A system for isolating a source of reference potential within a television receiver from the alternating current line voltage source from which power for said receiver is derived, comprising: first and second terminals; rectifying and filtering means coupled to said terminals and to said alternating current line voltage source for providing at said first terminal a first direct current voltage supply with respect to said second terminal; switching means including first and second bidirectionally conductive switches coupled to a deflection winding for generating deflection current in said deflection winding, said first switch being direct current coupled to said first and second terminals; a first winding coupled to said switching means for having induced therein current flow in response to operation of said switching means; and at least a second winding magnetically coupled to said first winding and electrically isolated therefrom for having induced therein voltage variations in response to said current flow in said first winding, said second winding being coupled to said source of reference potential for having said voltage variations induced therein with respect to said reference potential, said second winding also being coupled to said deflection winding for inducing said deflection current flow therein in response to said voltage variations.
Claim 10
Dependent Claim
91 words
A system for isolating a source of reference potential from an alternating current line voltage source according to claim 7 wherein a third winding is magnetically coupled to said first winding and electrically isolated therefrom, said third winding being coupled to said source of reference potential for having voltage variations induced thereacross with respect to reference potential; and second rectifying means are coupled to said third winding for rectifying said voltage variations induced across said third winding with respect to reference potential and for supplying said rectified variations to said receiver.
Claim 11
Independent Claim
224 words
A system for isolating a source of reference potential within a television receiver from the alternating current line voltage source from which power for said receiver is derived, comprising: first and second terminals; rectifying and filtering means coupled to said terminals and to said alternating current line voltage source for providing at said first terminal a first direct current voltage supply with respect to said second terminal; first bidirectionally conductive switching means direct current coupled to said first and second terminals; a first winding coupled to said first switching means for having induced therein current flow in response to operation of said first switching means; at least a second winding magnetically coupled to said first winding and electrically isolated therefrom for having induced therein voltage variations in response to said current flow in said first winding, said second winding being coupled to said source of reference potential for having said voltage variations induced therein with respect to said reference potential; and second bidirectionally conductive switching means and a deflection winding coupled to each other and to said second winding for having induced thereacross voltage variations with respect to said reference potential, said second bidirectionally conductive switching means being coupled to a source of signals for switching in response thereto for inducing deflection current in said deflection winding during a portion of each deflection interval.
Claim 12
Independent Claim
224 words
A system for isolating a source of reference potential within a television receiver from the alternating current line voltage source from which power for said receiver is derived, comprising: first and second terminals; rectifying and filtering means coupled to said terminals and to said alternating current line voltage source for providing at said first terminal a first direct current voltage supply with respect to said second terminal; first bidirectionally conductive switching means direct current coupled to said first and second terminals; a first winding coupled to said first switching means for having induced therein current flow in response to operation of said first switching means; at least a second winding magnetically coupled to said first winding and electrically isolated therefrom for having induced therein voltage variations in response to said current flow in said first winding, said second winding being coupled to said source of reference potential for having said voltage variations induced therein with respect to said reference potential; and second bidirectionally conductive switching means and a deflection winding coupled to each other and to said second winding for having induced thereacross voltage variations with respect to said reference potential, said second bidirectionally conductive switching means being coupled to a source of signals for switching in response thereto for inducing deflection current in said deflection winding during a portion of each deflection interval.
Claim 13
Dependent Claim
88 words
A system for isolating a source of reference potential from an alternating current line voltage source according to claim 9 wHerein a third winding is magnetically coupled to said first winding and electrically isolated therefrom, said third winding being coupled to said source of reference potential for having voltage variations induced thereacross with respect to reference potential; and second rectifying means are coupled to said third winding for rectifying said voltage variations induced thereacross with respect to reference potential and for supplying said rectified variations to said receiver.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |