US3891892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Start-up control circuit for SCR deflection
Assignee: RCA Licensing Corp
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Filing: 1973-12-04
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Granted: 1975-06-24
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Expires: 1993-12-04
Abstract
Abstract A boost voltage delay circuit for deflection circuit utilizing trace and commutating switches to generate deflection current in a deflection winding. A supply voltage boost circuit derives voltage from an inductor coupled between the direct current voltage supply and the commutating switch, boosts and regulates it, and supplies this regulated boost voltage to the commutating switch. The boost voltage delay circuit monitors the commutation switching action by rectifying voltage variations appearing across the inductor to charge an R-C circuit for several cycles of commutation switching action before the voltage across the R-C circuit rises sufficiently to turn on a transistor which enables the boost voltage circuit to supply boost voltage to the commutating switch. Commutation loss due to failure of the commutating switch to become reverse biased under applied boost voltage is thereby prevented.
Inventors
- 👤 Walter Bohringer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:04
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/83
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
193 words
A boost voltage delay system for switching loss protection in a deflection system comprising: a deflection winding; a source of direct current voltage; inductive means coupled to said direct current voltage source; first and second deflection switching means coupled to each other and to said inductive means and said deflection winding, said first switching means operative from a first to a second state for providing a current path through said inductive means for a portion of each deflection cycle; controllable voltage generating and rectifying means coupled to said direct current voltage supply and to said inductive means for generating, rectifying and adding boost voltage to said direct current voltage is response to said flow of current through said inductive means; and boost voltage delaying means including rectifYing means coupled to said inductive means and to said controllable voltage generating and rectifying means for generating signals in response to said flow of current through said inductive means and for rectifying said signals in said rectifying means for supplying a delayed control voltage for said controllable voltage generating and rectifying means for delaying the supply of said rectified boost voltage to said first switching means.
Claim 2
Dependent Claim
193 words
A boost voltage delay system for switching loss protection in a deflection system comprising: a deflection winding; a source of direct current voltage; inductive means coupled to said direct current voltage source; first and second deflection switching means coupled to each other and to said inductive means and said deflection winding, said first switching means operative from a first to a second state for providing a current path through said inductive means for a portion of each deflection cycle; controllable voltage generating and rectifying means coupled to said direct current voltage supply and to said inductive means for generating, rectifying and adding boost voltage to said direct current voltage is response to said flow of current through said inductive means; and boost voltage delaying means including rectifYing means coupled to said inductive means and to said controllable voltage generating and rectifying means for generating signals in response to said flow of current through said inductive means and for rectifying said signals in said rectifying means for supplying a delayed control voltage for said controllable voltage generating and rectifying means for delaying the supply of said rectified boost voltage to said first switching means.
Claim 3
Dependent Claim
34 words
A boost voltage delay system according to claim 1 wherein: said delayed control voltage is provided by charging a resistance-capacitance time constant circuit from said generated and rectified signals to a predetermined threshold voltage.
Claim 4
Dependent Claim
51 words
A boost voltage delay system according to claim 2 wherein: said resistance-capacitance time constant circuit is coupled to a control electrode of an active current conducting device, the main current conducting path of which is coupled to said controllable voltage generating and rectifying means for supplying said delayed control voltage thereto.
Claim 5
Dependent Claim
43 words
A boost voltage delay system according to claim 3 wherein: said controllable voltage generating and rectifying means includes an active current conducting device which is controlled by said control voltage for rectifying more of said generated boost voltage when said control voltage decreases.
Claim 6
Dependent Claim
241 words
A boost voltage delay system for switching loss protection in a television receiver deflection system comprising: a source of direct current voltage; a deflection rate generator; a deflection winding; inductive means; first switching means coupled to said source of direct current voltage, to said inductive means, to said deflection winding, and to said deflection rate generator for switching in response to signals generated by said deflection rate generator and for exciting current flow in said inductive means and said deflection winding in response to said switching; second switching means coupled to said first switching means and to said deflection winding for switching in response to current flow in said inductive means for exciting current flow in said deflection winding in response to said switching; generating and rectifying means coupled to said direct current voltage supply and to said inductive means for generating a boost voltage to be added to said direct current voltage in response to said current flow in said inductive means and for rectifying said boost voltage; and boost voltage delaying means including unidirectional current conducting means coupled to said inductive means and to said generating and rectifying means for generating signals in response to said flow of current through said inductive means and for rectifying said signals in said undirectional conducting means thereby supplying a delayed control voltage to said generating and rectifying means and delaying the supply or said rectified boost voltage to said first switching means.
Claim 7
Dependent Claim
241 words
A boost voltage delay system for switching loss protection in a television receiver deflection system comprising: a source of direct current voltage; a deflection rate generator; a deflection winding; inductive means; first switching means coupled to said source of direct current voltage, to said inductive means, to said deflection winding, and to said deflection rate generator for switching in response to signals generated by said deflection rate generator and for exciting current flow in said inductive means and said deflection winding in response to said switching; second switching means coupled to said first switching means and to said deflection winding for switching in response to current flow in said inductive means for exciting current flow in said deflection winding in response to said switching; generating and rectifying means coupled to said direct current voltage supply and to said inductive means for generating a boost voltage to be added to said direct current voltage in response to said current flow in said inductive means and for rectifying said boost voltage; and boost voltage delaying means including unidirectional current conducting means coupled to said inductive means and to said generating and rectifying means for generating signals in response to said flow of current through said inductive means and for rectifying said signals in said undirectional conducting means thereby supplying a delayed control voltage to said generating and rectifying means and delaying the supply or said rectified boost voltage to said first switching means.
Claim 8
Dependent Claim
158 words
A boost voltage delay system according to claim 5 wherein: said boost voltage delaying means is coupled through a first conducting path to said deflection rate generator and supplies direct current operating voltage thereto from some predetermined time after energization of said television receiver until some predetermined time after de-energization of said television receiver; and a second source of direct current operating voltage is coupled through a second conducting path to said deflection rate generator, said second source of voltage being energized upon energization of said television receiver and de-energized upon of said television receiver and said deflection rate generator deriving operating voltage therefrom immediately upon energization of said receiver and deriving operating voltage from said boost voltage delaying means after de-energization of said receiver, said deflection rate generator thereby being supplied with operating potential for providing switching signals to said first switching means from energizAtion of said receiver until some predetermined time after de-energization of said receiver.
Claim 9
Dependent Claim
34 words
A boost voltage delay system according to claim 5 wherein: said delayed control voltage is provided by charging a resistance-capacitance time constant circuit from said generated and rectified signals to a predetermined threshold voltage.
Claim 10
Dependent Claim
48 words
A boost voltage delay system according to claim 7 wherein: said resistance-capacitance time constant circuit is coupled to a control electrode of an active current conducting device, the main current conducting path of which is coupled to said generating and rectifying means for supplying said control voltage thereto.
Claim 11
Dependent Claim
41 words
A boost voltage delay system according to claim 8 wherein: said generating and rectifying means includes an active current conducting device which is controlled by said control voltage for rectifying more of said generated boost voltage when said control voltage decreases.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |