GB1529052A - Circuit arrangement for obtaining a sawtooth current in a coil - Google Patents
Circuit arrangement for obtaining a sawtooth current in a coilInfo
- Publication number
- GB1529052A GB1529052A GB408377A GB408377A GB1529052A GB 1529052 A GB1529052 A GB 1529052A GB 408377 A GB408377 A GB 408377A GB 408377 A GB408377 A GB 408377A GB 1529052 A GB1529052 A GB 1529052A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- diode
- capacitor
- coil
- scr
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
- H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
- H03K4/83—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices with more than two PN junctions or with more than three electrodes or more than one electrode connected to the same conductivity region
Landscapes
- Details Of Television Scanning (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
1529052 Sawtooth current generator INDESIT INDUSTRIA ELETTRODOMESTICI ITALIANA SpA 1 Feb 1977 [14 May 1976 (2)] 04083/77 Heading H3T A circuit arrangement to produce a periodic sawtooth current in a deflection coil 10 gives a controllable switching device 16 a long recovery time relative to the sawtooth period. In operation the first part of the stroke current passes through diode 13, while diode 15 and the SCR16 are off and capacitor 34 charged. At some time in this first part, a sync pulse is applied to fire the SCR16. The capacitor 34 resonantly discharges through the coil 33 and the SCR. When the current in diode 13 has fallen to zero, the stroke current is supplied via the choke 12 and via the diode 15, and initially via SCR16 also. After a half cycle, the current in capacitor 34 and coil 34 reverses, turning off the SCR, and is taken through the two diodes 15, 13 while the stroke current continues. The second half-cycle in the series circuit 33, 34 finishes and the reversal of current cuts off diode 13. The SCR has the whole of this second half-cycle to recover to the fully cut-off condition. There is now no low impedance conductive path in parallel with coil 20 and fly back commences resonantly with capacitor 14. Some current continues to flow in diode 15 until the voltage on capacitor 14 has become such as to cut off this diode sometime before the end of flyback. Flyback finishes and the cycle then repeats. Capacitor 35 is the usual S-correction capacitor. In a second embodiment (Fig. 4 not shown) a series RC (46, 47) suppresses parasitic oscillations in the SCR circuit and an additional series tuned circuit (41, 42) resonant at the sawtooth frequency forms a coupling between the SCR and the coil.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT6817876A IT1072330B (en) | 1976-05-14 | 1976-05-14 | Sawtooth generator for CRT deflection coil - has series resonance circuit in parallel with second switching element connected to coil |
IT6817976A IT1072331B (en) | 1976-05-14 | 1976-05-14 | Sawtooth generator for CRT deflection coil - has series resonance circuit in parallel with second switching element connected to coil |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1529052A true GB1529052A (en) | 1978-10-18 |
Family
ID=26329885
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB408377A Expired GB1529052A (en) | 1976-05-14 | 1977-02-01 | Circuit arrangement for obtaining a sawtooth current in a coil |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE2711514A1 (en) |
FR (1) | FR2351543A1 (en) |
GB (1) | GB1529052A (en) |
NL (1) | NL7701157A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1072136B (en) * | 1976-12-07 | 1985-04-10 | Indesit | CIRCUIT TO OBTAIN A SAW TOOTH CURRENT IN A COIL |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7217254A (en) * | 1972-12-19 | 1974-06-21 | ||
US3452244A (en) * | 1968-04-15 | 1969-06-24 | Rca Corp | Electron beam deflection and high voltage generation circuit |
DK138720B (en) * | 1973-06-01 | 1978-10-16 | Philips Nv | Coupling with a line deflection circuit. |
-
1977
- 1977-02-01 GB GB408377A patent/GB1529052A/en not_active Expired
- 1977-02-03 NL NL7701157A patent/NL7701157A/en not_active Application Discontinuation
- 1977-03-16 DE DE19772711514 patent/DE2711514A1/en not_active Withdrawn
- 1977-03-31 FR FR7709707A patent/FR2351543A1/en active Granted
Also Published As
Publication number | Publication date |
---|---|
NL7701157A (en) | 1977-11-16 |
FR2351543B1 (en) | 1984-02-17 |
FR2351543A1 (en) | 1977-12-09 |
DE2711514A1 (en) | 1977-12-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |