GB1419177A - Line-scanning circuit stage - Google Patents
Line-scanning circuit stageInfo
- Publication number
- GB1419177A GB1419177A GB4967473A GB4967473A GB1419177A GB 1419177 A GB1419177 A GB 1419177A GB 4967473 A GB4967473 A GB 4967473A GB 4967473 A GB4967473 A GB 4967473A GB 1419177 A GB1419177 A GB 1419177A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- circuits
- voltage
- supply
- deflection
- 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
- H03K4/085—Protection of sawtooth generators
-
- 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
- H04N3/20—Prevention of damage to cathode-ray tubes in the event of failure of scanning
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Scanning (AREA)
Abstract
1419177 Cathode-ray tube circuits; television line time-base circuits LOEWE OPTA GmbH 25 Oct 1973 [28 Oct 1972] 49674/73 Headings H3T and H4T [Also in Division H2] A television receiver employing a thyristorized horizontal deflection circuit is provided with a protective circuit which, in response to certain abnormal operating conditions shortcircuits the power supply to the fly-back thyristor of the deflection circuit, by rendering the latter conductive. This causes a reconnectable electronic fuse in the D.C. supply to the deflection to break and so interrupt the operation until it is reset. Fig. 1, shows one embodiment in which, when a voltage proportional to the deflecting current in the tangent correcting capacitor ("S"-shaping capacitor) 8 falls below a predetermined voltage and/or when, due to excess beam current in the cathode-ray tube, the voltage across resistor 48 in the secondary winding of the EHT transformer exceeds a predetermined value, respective circuits 15, 16 produce respective outputs which cause a gating circuit 14 to short-circuit the triggering pulses to ground and to apply the supply voltage U B to the ignition electrode of thyristor 2. The latter is thus rendered continuously conductive and short-circuits the supply. Details of the circuits 14, 15 and 16 are given with reference to Fig 2 (not shown) A transductor circuit 11 inductively coupled with the deflection circuit regulates energy absorption
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19722252973 DE2252973C3 (en) | 1972-10-28 | 1972-10-28 | Protection circuit for a thyristor horizontal deflection circuit in a television receiver, which triggers an interruption in the power supply of the deflection stage in the event of power overload of the picture tube or voltage overload of the deflection stage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1419177A true GB1419177A (en) | 1975-12-24 |
Family
ID=5860305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4967473A Expired GB1419177A (en) | 1972-10-28 | 1973-10-25 | Line-scanning circuit stage |
Country Status (4)
| Country | Link |
|---|---|
| AT (1) | AT338346B (en) |
| DE (1) | DE2252973C3 (en) |
| GB (1) | GB1419177A (en) |
| NL (1) | NL7311391A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4126816A (en) * | 1977-05-13 | 1978-11-21 | Rca Corporation | High voltage protection circuit |
| US4162434A (en) * | 1977-11-07 | 1979-07-24 | Rca Corporation | Regulator with short circuit protection |
-
1972
- 1972-10-28 DE DE19722252973 patent/DE2252973C3/en not_active Expired
-
1973
- 1973-08-17 NL NL7311391A patent/NL7311391A/xx not_active Application Discontinuation
- 1973-10-25 GB GB4967473A patent/GB1419177A/en not_active Expired
- 1973-10-25 AT AT906673A patent/AT338346B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE2252973A1 (en) | 1974-05-16 |
| AT338346B (en) | 1977-08-25 |
| DE2252973C3 (en) | 1975-05-28 |
| ATA906673A (en) | 1976-12-15 |
| DE2252973B2 (en) | 1974-10-10 |
| NL7311391A (en) | 1974-05-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |