US4127875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inrush current start-up circuit for a television receiver
Assignee: RCA Licensing Corp
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Filing: 1976-12-15
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Granted: 1978-11-28
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Expires: 1996-12-15
Abstract
Abstract A start-up circuit for a television receiver includes a circuit for rectifying the AC line voltage and a filter for providing a smoothed DC voltage. When the receiver is turned on, an initial interval exists in which inrush current flows into the filter. A magnetically coupled winding of an inductor in the path of the inrush current develops an alternating current potential during the initial interval. This potential is rectified and provides a start-up operating voltage for the television receiver.
Inventors
- 👤 Ronald E. Fernsler
- 👤 John C. Peer
- 👤 David W. Luz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:27
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
122 words
A start-up circuit for a television receiver, comprising: first rectifying means responsive to a source of first alternating current voltage for providing a pulsating direct current voltage; filter means coupled to said rectifying means for providing a first direct current voltage and in which an inrush current flows during an initial interval; a first inductor coupled in the path of said inrush current, the time rate of change of said inrush current developing a second alternating current voltage across said first inductor during said initial interval; a deflection circuit; and first means coupled to said first inductor and responsive to said second alternating current voltage for developing a second direct current voltage suitable for operating said deflection circuit during said initial interval.
Claim 2
Dependent Claim
122 words
A start-up circuit for a television receiver, comprising: first rectifying means responsive to a source of first alternating current voltage for providing a pulsating direct current voltage; filter means coupled to said rectifying means for providing a first direct current voltage and in which an inrush current flows during an initial interval; a first inductor coupled in the path of said inrush current, the time rate of change of said inrush current developing a second alternating current voltage across said first inductor during said initial interval; a deflection circuit; and first means coupled to said first inductor and responsive to said second alternating current voltage for developing a second direct current voltage suitable for operating said deflection circuit during said initial interval.
Claim 3
Dependent Claim
24 words
A start-up circuit according to claim 1 wherein said deflection circuit begins operation before said first direct current voltage has reached a steady-state value.
Claim 4
Dependent Claim
29 words
A start-up circuit according to claim 1 wherein said deflection circuit provides a third direct current voltage replacing said second direct current voltage after said initial interval has elapsed.
Claim 5
Dependent Claim
25 words
A start-up circuit according to claim 3 wherein said first means includes a rectifier diode which is reversed biased after said initial interval has elapsed.
Claim 6
Dependent Claim
44 words
A start-up circuit according to claim 4 wherein said deflection circuit comprises a horizontal deflection circuit and includes second means for generating a third alternating current voltage and second rectifying means for providing said third direct current voltage after said initial interval has elapsed.
Claim 7
Dependent Claim
38 words
A start-up circuit according to claim 5 wherein said second means includes a horizontal output transformer and a secondary winding coupled to said horizontal output transformer across which said secondary winding said third alternating current voltage is developed.
Claim 8
Dependent Claim
28 words
A start-up circuit according to claim 6 wherein said first means includes a second inductor magnetically coupled to said first inductor for developing said second direct current voltage.
Claim 9
Dependent Claim
137 words
In a television receiver, a start-up power supply, comprising: first rectifying means responsive to a source of first alternating current potential for providing a pulsating direct current potential; filter means coupled to said rectifying means for providing a first direct current potential and in which an inrush current flows during an initial interval; a first inductor, in which said inrush current flows, coupled to said filter means; a second inductor magnetically coupled to said first inductor, the time rate of change of said inrush current in said first inductor developing a second alternating current potential in said second inductor during said initial interval; a horizontal deflection circuit; and first power supply means coupled to said second inductor for providing during said initial interval a first operating potential of sufficient magnitude for use by said horizontal deflection circuit.
Claim 10
Dependent Claim
137 words
In a television receiver, a start-up power supply, comprising: first rectifying means responsive to a source of first alternating current potential for providing a pulsating direct current potential; filter means coupled to said rectifying means for providing a first direct current potential and in which an inrush current flows during an initial interval; a first inductor, in which said inrush current flows, coupled to said filter means; a second inductor magnetically coupled to said first inductor, the time rate of change of said inrush current in said first inductor developing a second alternating current potential in said second inductor during said initial interval; a horizontal deflection circuit; and first power supply means coupled to said second inductor for providing during said initial interval a first operating potential of sufficient magnitude for use by said horizontal deflection circuit.
Claim 11
Dependent Claim
66 words
A start-up power supply according to claim 8 wherein said horizontal deflection circuit includes: a horizontal output transformer; a secondary winding coupled to said horizontal output transformer; and second power supply means coupled to said secondary winding and responsive to the voltage generated in said secondary winding for providing a second operating potential in place of said first operating potential after said initial interval has elapsed.
Claim 12
Dependent Claim
29 words
A start-up power supply according to claim 9 wherein said first power supply means includes a first diode rectifier which is reverse biased after said initial interval has elapsed.
Claim 13
Dependent Claim
24 words
A start-up supply according to claim 10 wherein said second power supply includes a second diode rectifier poled for providing a second operating potential.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-27 | 1982-05-29 | 1982-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-27 | 1986-05-29 | 1986-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-27 | 1990-05-29 | 1990-11-28 | $7700.00 | Window Closed / Lapsed |