US3740474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage supplies
Assignee: RCA Licensing Corp
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Filing: 1971-11-01
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Granted: 1973-06-19
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Expires: 1991-11-01
Abstract
Abstract Direct operating voltages for a television receiver are derived from an associated line scanning circuit of the type employing semiconductor (e.g., SCR) trace and commutating switches, each of which conducts for a portion of each line scanning interval. One voltage supply is derived by means of a full wave rectifier circuit coupled to an input inductance, the inductance being coupled from a main direct operating voltage source to a circuit point intermediate the trace and commutating switches. Additional direct voltages are derived by rectifying flyback pulses produced across various segments of an associated scanning output transformer. At least one of the flyback pulse rectifying circuits includes an arrangement of inductance and capacitance coupled to the associated rectifier for constraining conduction of the rectifier mainly to the first half of the flyback pulse. The derived voltages are relatively insensitive to changes in beam current and line voltage and, furthermore, do not deleteriously affect operation of the scanning circuit.
Inventors
- 👤 W Dietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:36
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185; H04N3/1856; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/305; H02M3/315; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/83
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
107 words
In a television receiver, a voltage supply system comprising a line scanning circuit having at least first and second controllable switching means arranged for conduction during respective first and second portions of each line scanning cycle, reactive circuit means, including energy storage capacitance, coupled between said first and second switching means, primary voltage supply means for providing a primary direct operating voltage, inductive means coupled between said primary voltage supply means and said reactive circuit means for coupling energy to said capacitance, and auxiliary voltage supply means comprising full-wave rectifying means and a filter circuit coupled to said inductive means for providing an auxiliary direct operating voltage.
Claim 2
Dependent Claim
107 words
In a television receiver, a voltage supply system comprising a line scanning circuit having at least first and second controllable switching means arranged for conduction during respective first and second portions of each line scanning cycle, reactive circuit means, including energy storage capacitance, coupled between said first and second switching means, primary voltage supply means for providing a primary direct operating voltage, inductive means coupled between said primary voltage supply means and said reactive circuit means for coupling energy to said capacitance, and auxiliary voltage supply means comprising full-wave rectifying means and a filter circuit coupled to said inductive means for providing an auxiliary direct operating voltage.
Claim 3
Dependent Claim
42 words
A voltage supply system according to claim 1 and further comprising regulating means including a variable inductance coupled to said inductive means and responsive to changes in operating conditions in said line scanning circuit for varying said inductance to counteract said changes.
Claim 4
Dependent Claim
48 words
A voltage supply system according to claim 1 wherein said inductive means comprises a first winding, and said auxiliary voltage supply means comprises a secondary winding associated with said first winding and a bridge rectifier arrangement coupled between opposite ends of said secondary winding and said filter circuit.
Claim 5
Dependent Claim
42 words
A voltage supply system according to claim 3 and further comprising regulating means including a variable inductance coupled to said inductive means and responsive to changes in operating conditions in said line scanning circuit for varying said inductance to counteract said changes.
Claim 6
Dependent Claim
50 words
A voltage supply system according to claim 1 wherein said inductive means comprises a first winding, and said auxiliary voltage supply means comprises a center-tapped secondary winding associated with said first winding and first and second rectifiers coupled to opposite ends of said secondary winding and to said filter circuit.
Claim 7
Dependent Claim
42 words
A voltage supply system according to claim 5 and further comprising regulating means including a variable inductance coupled to said inductive means and responsive to changes in operating conditions in said line scanning circuit for varying said inductance to counteract said changes.
Claim 8
Dependent Claim
36 words
A voltage supply system according to claim 6 and further comprising additional rectifying and filtering means direct coupled to said second switching means and to said inductive means for providing a further direct operating voltage supply.
Claim 9
Dependent Claim
91 words
A voltage supply system according to claim 6 and further comprising a transformer coupled across said first switching means, additional rectifying means coupled to a point on said transformer and poled to respond to voltage pulses produced at said point during the retrace portion of each line scanning cycle, and filtering means coupled to said additional rectifying means comprising a first capacitor and a first inductor, said inductor and capacitor being resonant at a frequency such that said additional rectifying means conducts mainly during the first half of said retrace portion.
Claim 10
Dependent Claim
160 words
In a television receiver, a voltage supply system comprising a line scanning circuit having at least first and second controllable switching means arranged for conduction during respective first and second portions of each line scanning cycle, reactive circuit means, including energy storage capacitance, coupled between said first and second switching means, means for supplying a primary direct operating voltage, inductive means coupled between said voltage supplying means and said reactive circuit means for coupling energy to said capacitance, a transformer having leakage inductance associated therewith coupled across said first switching means, rectifying means coupled to a terminal on said transformer and poled to respond to voltage pulses produced at said terminal during the retrace portion of each line scanning cycle, and filtering means coupled to said rectifying means comprising a first capacitor and a first inductor, said inductor and capacitor being resonant at a frequency such that said rectifying means conducts mainly during the first half of said retrace portion.
Claim 11
Dependent Claim
160 words
In a television receiver, a voltage supply system comprising a line scanning circuit having at least first and second controllable switching means arranged for conduction during respective first and second portions of each line scanning cycle, reactive circuit means, including energy storage capacitance, coupled between said first and second switching means, means for supplying a primary direct operating voltage, inductive means coupled between said voltage supplying means and said reactive circuit means for coupling energy to said capacitance, a transformer having leakage inductance associated therewith coupled across said first switching means, rectifying means coupled to a terminal on said transformer and poled to respond to voltage pulses produced at said terminal during the retrace portion of each line scanning cycle, and filtering means coupled to said rectifying means comprising a first capacitor and a first inductor, said inductor and capacitor being resonant at a frequency such that said rectifying means conducts mainly during the first half of said retrace portion.
Claim 12
Dependent Claim
44 words
In a television receiver, a voltage supply system according to claim 9 wherein: said first capacitor and leakage inductance associated with said terminal on said transformer being proportioned to facilitate conduction of said additional rectifying means during said first half of said retrace portion.
Claim 13
Dependent Claim
66 words
In a television receiver, a voltage supply system according to claim 9 and further comprising regulating means including a variable inductance coupled to said inductive means and responsive to changes in operating conditions in said line scanning circuit for varying said inductance to counteract said changes, and a second capacitor coupled to said first inductor remote from said first capaciTor for providing a regulated auxiliary voltage.
References Cited (Backward Citations)
US3517253A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |