US3906305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for generating a sawtooth deflection current through a line deflection coil
Assignee: US Philips Corp
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Filing: 1974-01-22
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Granted: 1975-09-16
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Expires: 1994-01-22
Abstract
Abstract A circuit arrangement for generating the line deflection current in which the line deflection coil forms part of a network which also includes a diode, a trace capacitor and a retrace capacitor. One or more further similar networks all having the same retrace time are arranged in series and this series arrangement is connected in parallel with a switch which may be that of a combined line deflection and supply voltage stabilizing circuit. The retrace voltage and thus the EHT across this series arrangement can be maintained constant while the line deflection current may be stabilized and/or East-West modulated. A difference current and a North-South correction current may be generated.
Inventors
- 👤 Antonius Hendrikus Hu Nillesen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:04
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N3/23; H04N3/233; H04N3/18
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
193 words
A circuit arrangement for generating a sawtooth deflection current having trace and retrace times through a first line deflection coil, said circuit comprising a first sawtooth network comprising a first diode adapted to be coupled to the coil, a first trace capacitance coupled to said first diode, and a first retrace capacitance coupled to said first diode, the circuit arrangement furthermore including a switching means adapted to be coupled to a voltage source and which is blocked during the retrace time, a second sawtooth network comprising a second diode, a second coil coupled to said second diode, a second trace capacitance coupled to said second coil, and a second retrace capacitance coupled to said second diode, the retrace time of the current through the second coil being approximately equal to the retrace time of the deflection current, means for coupling said sawtooth networks together and for providing that the two diodes are in series with each other and have the same conductivity direction, the series arrangement of the two diodes being coupled in parallel across the switching means, and first control element means for controlling the voltage across one of said trace capacitances.
Claim 2
Dependent Claim
193 words
A circuit arrangement for generating a sawtooth deflection current having trace and retrace times through a first line deflection coil, said circuit comprising a first sawtooth network comprising a first diode adapted to be coupled to the coil, a first trace capacitance coupled to said first diode, and a first retrace capacitance coupled to said first diode, the circuit arrangement furthermore including a switching means adapted to be coupled to a voltage source and which is blocked during the retrace time, a second sawtooth network comprising a second diode, a second coil coupled to said second diode, a second trace capacitance coupled to said second coil, and a second retrace capacitance coupled to said second diode, the retrace time of the current through the second coil being approximately equal to the retrace time of the deflection current, means for coupling said sawtooth networks together and for providing that the two diodes are in series with each other and have the same conductivity direction, the series arrangement of the two diodes being coupled in parallel across the switching means, and first control element means for controlling the voltage across one of said trace capacitances.
Claim 3
Dependent Claim
121 words
A circuit arrangement as claimed in claim 1, further comprising a third sawtooth network having a third diode, a third coil coupled to said third diode, a third trace capacitance coupled to said third coil and a third retrace capacitance coupled to said third diode, the retrace time of the current through the third coil being approximately equal to the retrace time of the deflection current, said coupling means coupling all sawtooth networks together and providing that the diodes of the networks are coupled together in series and with the same conductivity direction and that the series arrangement of the diodes is coupled in parallel across the switching means, and means for controlling the voltages across all trace capacitors but one.
Claim 4
Dependent Claim
82 words
A circuit arrangement as claimed in claim 1, wherein the switching means comprises a series arrangment of a fourth diode and a transistor, which fourth diode has the same conductivity direction as the collector current of the transistor, a series arrangement coupled to the junction of said fourth diode and said transistor and including an inductive element and the supply voltage source, a fifth diode coupled to said element and to the sawtooth networks, the conductivity time of the transistor being controllable.
Claim 5
Dependent Claim
46 words
A circuit arrangement as claimed in claim 3, further comprising means for applying a voltage proportional to the voltage present during the retrace time across the series arrangement of the diodes of the sawtooth networks to said transistor for controlling the conductivity time of the transistor.
Claim 6
Dependent Claim
43 words
A circuit arrangement as claimed in claim 1, wherein the voltage present during the retrace time across part of the diodes of the sawtooth networks is substantially constant and further comprising a transformer having a winding coupled to said part of said diodes.
Claim 7
Dependent Claim
30 words
A circuit arrangement as claimed in claim 2, further comprising a second control element means for controlling the sum of the voltage across the said first and second trace capacitances.
Claim 8
Dependent Claim
35 words
A circuit arrangement as claimed In claim 1, wherein said first trace capacitance comprises a plurality of capacitors, one of said capacitors comprising the trace capacitance cooperating with the coil of said second sawtooth network.
Claim 9
Dependent Claim
21 words
A circuit arrangement as claimed in claim 7, wherein said first and second coils comprise two substantially identical line deflection coils.
Claim 10
Dependent Claim
36 words
A circuit arrangement as claimed in claim 1, wherein the control element means comprises a stabilizing circuit means for stabilizing the voltage present during the retrace time across the joint diodes of the second sawtooth network.
Claim 11
Dependent Claim
30 words
A circuit arrangement as claimed in claim 1 further comprising a field deflection current generator, wherein the control element comprises a modulation source coupled to the field deflection current generator.
Claim 12
Dependent Claim
19 words
A circuit as claimed in claim 10, wherein the controlled voltage across said one capacitance is field frequency sawtooth-shaped.
Claim 13
Dependent Claim
18 words
Television display apparatus as claimed in claim 10, characterized in that the controlled voltage is field frequency sawtooth-shaped.
References Cited (Backward Citations)
US3444426A
Cited
US3691422A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |