GB1068307A - Circuit arrangement for the generation of a periodically fluctuating unidirectional current in an inductive load - Google Patents
Circuit arrangement for the generation of a periodically fluctuating unidirectional current in an inductive loadInfo
- Publication number
- GB1068307A GB1068307A GB3976465A GB3976465A GB1068307A GB 1068307 A GB1068307 A GB 1068307A GB 3976465 A GB3976465 A GB 3976465A GB 3976465 A GB3976465 A GB 3976465A GB 1068307 A GB1068307 A GB 1068307A
- Authority
- GB
- United Kingdom
- Prior art keywords
- inductor
- capacitor
- parabolic
- load
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000001939 inductive effect Effects 0.000 title abstract 3
- 239000003990 capacitor Substances 0.000 abstract 6
- 238000004804 winding Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/26—Modifications of scanning arrangements to improve focusing
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/04—Generating pulses having essentially a finite slope or stepped portions having parabolic shape
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
- H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
- H04N3/233—Distortion correction, e.g. for pincushion distortion correction, S-correction using active elements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/16—Picture reproducers using cathode ray tubes
- H04N9/28—Arrangements for convergence or focusing
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Scanning (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
1,068,307. Waveform generation circuits; cathode-ray tube circuits. FERNSEH G.m.b.H. Sept. 17, 1965 [Sept. 19, 1964; Nov. 25, 1964; Aug. 25, 1965], No. 39764/65. Headings H3T and H4T. A parabolic waveform is produced in an inductive load by connecting it in parallel with a capacitor and inpulsing it unidirectionally at twice the resonant frequency of the parallel circuit. In Fig. 4 (not shown), a circuit using a transistor switch and a series phase shift-coil (3) generates parabolic (or semi-sinusoidal) current waves in a focusing coil (1) of a cathoderay tube to maintain focus during the scan. In Fig. 6 a similar circuit using S.C.R's. adds a line frequency modulation to the framescanning current (as in waveform C) to ensure registry of the raster of a shadow mask tube. The circuit comprises two generators, each comprising a load inductor 1 tuned to about half the line frequency by a capacitor 2 and connected in series with a small inductor 3 and an S.C.R. to a D.C. voltage source U. When the S.C.R. is fired, capacitor 2 is charged resonantly through inductor 3 until after half-acycle, when the voltage across the capacitor reaches a reverse peak and the S.C.R. automatically extinguishes. The capacitor then discharges into the inductive load and the circuit rings for half-a-cycle producing a half sine wave current in the load if the tuning is exactly to half the line frequency and a parabolic current if the ratio of frequencies is greater than 2. The load inductors are coupled to the deflection coils through a capacitor 8 which blocks frame deflection currents and an inductor 10 is provided to block the parabolic waves for the frame output transformer secondary winding S. Inductor 3 is chosen to provide a desired phase shaft between the input pulses and the parabolic wave. Components 11, 12 prevent self-oscillation in inductor 3. The two circuits provide parabolic waves in opposite sense and these are differentially modulated by the frame saw-tooth applied at A so that at the mid-point they are equal and opposite. The two S.C.R's. may each be replaced by two complementaty transistors which may be connected to series with rectifiers to prevent reverse conduction or by valves.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1964F0044017 DE1247379B (en) | 1964-09-19 | 1964-09-19 | Circuit arrangement for generating arcuate currents |
DEF44516A DE1223876B (en) | 1964-09-19 | 1964-11-25 | Method for generating parabolic currents |
DE1965F0046980 DE1259936B (en) | 1964-09-19 | 1965-08-25 | Circuit arrangement for horizontal raster correction in color television picture tubes |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1068307A true GB1068307A (en) | 1967-05-10 |
Family
ID=27210389
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3976465A Expired GB1068307A (en) | 1964-09-19 | 1965-09-17 | Circuit arrangement for the generation of a periodically fluctuating unidirectional current in an inductive load |
Country Status (2)
Country | Link |
---|---|
DE (3) | DE1247379B (en) |
GB (1) | GB1068307A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3676733A (en) * | 1968-06-22 | 1972-07-11 | Philips Corp | Circuit arrangement for generating a line frequency parabolically modulated sawtooth current of field frequency through a field deflection coil |
US4668897A (en) * | 1984-04-04 | 1987-05-26 | Rca Corporation | North-south pincushion corrected deflection circuit |
EP0643532A1 (en) * | 1993-09-09 | 1995-03-15 | Pioneer Electronic Corporation | Dynamic focus circuit of electromagnetic focusing type for cathode ray tube of video image displaying apparatus |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1585465A (en) * | 1976-09-06 | 1981-03-04 | Rca Corp | East-west pincushion modulator |
DE19545533A1 (en) * | 1994-12-09 | 1996-06-27 | Matsushita Electric Ind Co Ltd | Electromagnetic focusing appts. for cathode ray tube |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE829469C (en) * | 1950-10-03 | 1952-01-24 | Fernseh Gmbh | Method for generating an arcuate electrical voltage curve |
-
1964
- 1964-09-19 DE DE1964F0044017 patent/DE1247379B/en active Pending
- 1964-11-25 DE DEF44516A patent/DE1223876B/en active Pending
-
1965
- 1965-08-25 DE DE1965F0046980 patent/DE1259936B/en active Pending
- 1965-09-17 GB GB3976465A patent/GB1068307A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3676733A (en) * | 1968-06-22 | 1972-07-11 | Philips Corp | Circuit arrangement for generating a line frequency parabolically modulated sawtooth current of field frequency through a field deflection coil |
US4668897A (en) * | 1984-04-04 | 1987-05-26 | Rca Corporation | North-south pincushion corrected deflection circuit |
EP0643532A1 (en) * | 1993-09-09 | 1995-03-15 | Pioneer Electronic Corporation | Dynamic focus circuit of electromagnetic focusing type for cathode ray tube of video image displaying apparatus |
Also Published As
Publication number | Publication date |
---|---|
DE1223876B (en) | 1966-09-01 |
DE1247379B (en) | 1967-08-17 |
DE1259936B (en) | 1968-02-01 |
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