US4112465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thrush current start-up circuit for a television receiver including a start-up decoupling circuit
Assignee: RCA Licensing Corp
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Filing: 1977-08-22
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Granted: 1978-09-05
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Expires: 1997-08-22
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 an inrush current flows into the filter. A winding, magnetically coupled to 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 load circuits. During the steady state interval, a second circuit provides the operating voltage, and a third circuit couples to the winding a voltage which varies in value from the initial interval to the steady state interval in a manner which decouples the alternating current potential from the load circuits during the entirety of the steady state interval.
Inventors
- 👤 Donald Henry Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:27
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
201 words
A start-up power supply, comprising: first rectifying means responsive to a source of first alternating current potential for providing a pulsating direct current voltage; filter means coupled to said first rectifying means for providing a first direct current voltage and in which an inrush current flows during an initial interval; a first inductor coupled to said filter means in which said inrush current flows; first means coupled to said first inductor and responsive to said inrush current for developing a second alternating current potential during said initial interval; a load circuit; second rectifying means coupled to said first means and responsive to said second alternating current potential for coupling a first operating voltage to said load circuit during said initial interval; second means coupled to said load circuit for providing a second operating voltage to said load circuit for replacing said first operating voltage during a steady state interval; and third means for coupling a third voltage to said second rectifying means, said third voltage varying in value from said initial interval to said steady state interval in a manner providing for decoupling of said second alternating current potential from said load circuit during the entirety of said steady state interval.
Claim 2
Dependent Claim
201 words
A start-up power supply, comprising: first rectifying means responsive to a source of first alternating current potential for providing a pulsating direct current voltage; filter means coupled to said first rectifying means for providing a first direct current voltage and in which an inrush current flows during an initial interval; a first inductor coupled to said filter means in which said inrush current flows; first means coupled to said first inductor and responsive to said inrush current for developing a second alternating current potential during said initial interval; a load circuit; second rectifying means coupled to said first means and responsive to said second alternating current potential for coupling a first operating voltage to said load circuit during said initial interval; second means coupled to said load circuit for providing a second operating voltage to said load circuit for replacing said first operating voltage during a steady state interval; and third means for coupling a third voltage to said second rectifying means, said third voltage varying in value from said initial interval to said steady state interval in a manner providing for decoupling of said second alternating current potential from said load circuit during the entirety of said steady state interval.
Claim 3
Dependent Claim
21 words
A power supply according to claim 1, wherein said third means comprises a first secondary winding of a horizontal output transformer.
Claim 4
Dependent Claim
21 words
A power supply according to claim 2, wherein said second means comprises a second secondary winding of said horizontal output transformer.
Claim 5
Dependent Claim
16 words
A power supply according to claim 3, wherein said load circuit comprises a horizontal deflection circuit.
Claim 6
Dependent Claim
24 words
A power supply according to claim 4, wherein said first operating voltage is coupled to a horizontal driver transistor of said horizontal deflection circuit.
Claim 7
Dependent Claim
21 words
A power supply according to claim 4, wherein said first means comprises a second inductor magnetically coupled to said first inductor.
Claim 8
Dependent Claim
186 words
A start-up circuit, comprising: first rectifying means responsive to a source of first alternating current potential for providing a pulsating direct current voltage; filter means coupled to said first rectifying means for providing a first direct current voltage and in which an inrush current flows during an initial interval; a start-up transformer including a primary winding coupled to said first rectifying means and a secondary winding in which a second alternating current potential is developed during said initial interval; a deflection circuit; second rectifying means coupled to said start-up transformer and responsive to said second alternating current potential for coupling a first operating voltage to said deflection circuit during said initial interval; first means coupled to said deflection circuit for providing a second operating voltage to said deflection circuit for replacing said first operating voltage during a steady state interval; and second means for coupling a third voltage to said second rectifying means, said third voltage varying in value from said initial interval to said steady state interval in a manner which maintains said second rectifying means nonconducting during the entirety of said steady state interval.
Claim 9
Dependent Claim
186 words
A start-up circuit, comprising: first rectifying means responsive to a source of first alternating current potential for providing a pulsating direct current voltage; filter means coupled to said first rectifying means for providing a first direct current voltage and in which an inrush current flows during an initial interval; a start-up transformer including a primary winding coupled to said first rectifying means and a secondary winding in which a second alternating current potential is developed during said initial interval; a deflection circuit; second rectifying means coupled to said start-up transformer and responsive to said second alternating current potential for coupling a first operating voltage to said deflection circuit during said initial interval; first means coupled to said deflection circuit for providing a second operating voltage to said deflection circuit for replacing said first operating voltage during a steady state interval; and second means for coupling a third voltage to said second rectifying means, said third voltage varying in value from said initial interval to said steady state interval in a manner which maintains said second rectifying means nonconducting during the entirety of said steady state interval.
Claim 10
Dependent Claim
21 words
A start-up circuit according to claim 7, wherein said second means comprises a first secondary winding of a deflection output transformer.
Claim 11
Dependent Claim
21 words
A start-up circuit according to claim 8, wherein said first means comprises a second secondary winding of a deflection output transformer.
Claim 12
Dependent Claim
184 words
A start-up power supply comprising: a first winding in which a first alternating current voltage is developed during a start-up interval; first rectifying means coupled to said first winding for rectifying said first alternating current voltage; filter means coupled to said first rectifying means for providing a first direct current operating voltage of a first polarity during said start-up interval, an alternating current ripple voltage being superimposed upon said first direct current voltage of a first polarity; a source of second direct current operating voltage of said first polarity coupled to said first filter means for replacing said first direct current operating voltage during a steady state interval, said second direct current operating voltage reverse biasing said first rectifying means; and a source of third direct current voltage coupled to said first winding of a polarity opposite said first polarity, the magnitude of said third direct current voltage changing from a start-up value to a steady state value in a manner which will prevent said alternating current ripple voltage from forward biasing said first rectifying means during any portion of said steady state interval.
Claim 13
Dependent Claim
184 words
A start-up power supply comprising: a first winding in which a first alternating current voltage is developed during a start-up interval; first rectifying means coupled to said first winding for rectifying said first alternating current voltage; filter means coupled to said first rectifying means for providing a first direct current operating voltage of a first polarity during said start-up interval, an alternating current ripple voltage being superimposed upon said first direct current voltage of a first polarity; a source of second direct current operating voltage of said first polarity coupled to said first filter means for replacing said first direct current operating voltage during a steady state interval, said second direct current operating voltage reverse biasing said first rectifying means; and a source of third direct current voltage coupled to said first winding of a polarity opposite said first polarity, the magnitude of said third direct current voltage changing from a start-up value to a steady state value in a manner which will prevent said alternating current ripple voltage from forward biasing said first rectifying means during any portion of said steady state interval.
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) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |