US4387324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote responsive television receiver ferroresonant power supply protection circuit
Assignee: RCA Corp
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Filing: 1981-11-16
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Granted: 1983-06-07
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Expires: 2001-11-16
Abstract
Abstract In a television receiver regulated power supply that is responsive to the state of a remote on/off command signal, the AC mains supply voltage is connected to the input terminals of a bridge rectifier through the mechanical switch portion of an on/off relay. A remote control circuit energizes the relay coil to close the mechanical switch upon receipt of the on-state command signal. The bridge rectifier then develops an unregulated DC voltage that is applied to a high frequency inverter for developing an alternating polarity input voltage. The alternating polarity input voltage is applied to a self-regulating or ferroresonant power supply circuit to produce regulated output voltages for various television receiver load circuits such as the ultor load and the horizontal deflection circuit. During a fault operating condition of the self-regulating circuit wherein the output voltages would tend to increase excessively, a protection circuit detects the occurrence of the fault operating condition and disables the remote control circuit to deenergize the relay coil and open the mechanical on/off switch. Operation of the self-regulating circuit stops to thereby deenergize the television receiver load circuits.
Inventors
- 👤 Donald H. Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:13
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185; H04N3/19; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/32; G05F1/34; G05F1/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
196 words
A disabling circuit for a television display system regulated power supply responsive to the state of a remote on/off command signal, comprising: a source of voltage available during both states of said remote on/off command signal; means for developing an input voltage upon application thereto of said available voltage; remote control means coupled to said available voltage source and to said input voltage developing means and responsive to said remote on/off command signal for applying said available voltage to said input voltage developing means during the on-state of said command signal; means including a self-regulating circuit energized by said input voltage for producing a regulated supply voltage, said self-regulating circuit comprising a saturable reactor and a capacitance coupled to a winding thereof to magnetically saturate at least a portion of the core of said reactor; a load circuit within said television display system energized by said regulated supply voltage; and means coupled to said remote control means and responsive to a fault operating condition of said self-regulating circuit for disabling said remote control means to discontinue the application of said available voltage to said input voltage developing means upon the occurrence of said fault operating condition.
Claim 2
Dependent Claim
196 words
A disabling circuit for a television display system regulated power supply responsive to the state of a remote on/off command signal, comprising: a source of voltage available during both states of said remote on/off command signal; means for developing an input voltage upon application thereto of said available voltage; remote control means coupled to said available voltage source and to said input voltage developing means and responsive to said remote on/off command signal for applying said available voltage to said input voltage developing means during the on-state of said command signal; means including a self-regulating circuit energized by said input voltage for producing a regulated supply voltage, said self-regulating circuit comprising a saturable reactor and a capacitance coupled to a winding thereof to magnetically saturate at least a portion of the core of said reactor; a load circuit within said television display system energized by said regulated supply voltage; and means coupled to said remote control means and responsive to a fault operating condition of said self-regulating circuit for disabling said remote control means to discontinue the application of said available voltage to said input voltage developing means upon the occurrence of said fault operating condition.
Claim 3
Dependent Claim
61 words
A disabling circuit according to claim 1 wherein said regulated supply voltage producing means includes a transformer having said input voltage applied to a primary winding thereof and having said supply voltage produced across a secondary winding thereof, said self-regulating circuit being coupled to said transformer secondary winding as a load circuit to provide for the regulation of said supply voltage.
Claim 4
Dependent Claim
53 words
A disabling circuit according to claim 2 wherein said load circuit comprises an ultor high voltage generator coupled to said transformer secondary winding and wherein said self-regulating circuit is coupled to another winding of said transformer, with said firstmentioned transformer secondary winding stepping up the voltage developed across said other transformer secondary winding.
Claim 5
Dependent Claim
63 words
A disabling circuit according to claim 2 wherein said fault operating condition responsive means includes means for applying the alternating voltage that is developed across said saturable reactor winding during normal operation of said self-regulating circuit to said remote control means, and wherein said alternating voltage is substantially absent during the occurrence of said fault operating condition to disable said remote control means.
Claim 6
Dependent Claim
21 words
A disabling circuit according to claim 4 wherein said alternating voltage applying means comprises a second winding of said saturable reactor.
Claim 7
Dependent Claim
59 words
A disabling circuit according to claim 4 wherein said remote control means includes an on/off switch coupled to said available voltage source and to said input voltage developing means and a control switch responsive to said remote on/off command signal and to the alternating voltage across said saturable reactor winding for controlling the conduction state of said on/off switch.
Claim 8
Dependent Claim
97 words
A disabling circuit according to claim 6 wherein said on/off switch comprises an electromechanical relay including a relay coil and a mechanical switch portion actuated by current in said relay coil, and wherein said control switch includes first and second controllable switching elements, said first switching element being responsive to said remote on/off command signal and coupled to said available voltage source and to a first terminal of said relay coil, said second switching element being responsive to the alternating voltage developed across said saturable reactor winding and coupled to a second terminal of said relay coil.
Claim 9
Dependent Claim
95 words
A disabling circuit according to claim 7 wherein an output terminal of said first switching element is coupled to a control terminal of said second switching element through a capacitor to change the conductive state of said second switching element during a start-up interval after receipt of the on-state command signal to one that actuates said mechanical switch portion, and wherein the alternating voltage developed across said saturable reactor winding is applied to said second switching element control terminal during the steady-state interval to maintain said second switching element in the aforementioned one conductive state.
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) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |