GB1392511A - Flyback eht and sawtooth current generator - Google Patents
Flyback eht and sawtooth current generatorInfo
- Publication number
- GB1392511A GB1392511A GB1759672A GB1759672A GB1392511A GB 1392511 A GB1392511 A GB 1392511A GB 1759672 A GB1759672 A GB 1759672A GB 1759672 A GB1759672 A GB 1759672A GB 1392511 A GB1392511 A GB 1392511A
- Authority
- GB
- United Kingdom
- Prior art keywords
- eht
- flyback
- transistor
- switching means
- winding
- 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
- H03K4/48—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
- H03K4/60—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor
- H03K4/62—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor using a semiconductor device operating as a switching device
-
- 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
- H04N3/18—Generation of supply voltages, in combination with electron beam deflecting
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Scanning (AREA)
- Dc-Dc Converters (AREA)
Abstract
1392511 EHT supplies PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 17 April 1972 [20 April 1971] 17596/72 Heading H2F [Also in Division H3] A flyback EHT and sawtooth current generator for TV apparatus includes switching means which is periodically non-conducting during flyback periods # and conducting during scan periods T-# and a sixth order network connected to the switching means and comprising a transformer having at least one primary winding and a secondary winding feeding a rectifier for generating said EHT from voltage pulses occurring during the flyback periods, said network having three resonant frequencies substantially equal to: where K = 1, 5 and 7 and S is a correction factor based on the extent of S-correction. The invention reduces the internal resistance of the EHT generator by providing voltage pulses having wide, flat tops. Fig. 4 shows a line output stage in which the switching means is transistor 12, coupled to balanced primary windings 2a, 2b of transformer 1 feeding deflection coils 9 via an S-correction capacitor 11 and linearizing components 10. The sixth order network is provided by a tertiary winding 5 and a parallel resonant circuit 16, 17, together with self-capacitance and leakage inductance. A voltage-multiplying EHT rectifier 14 may be employed. The balanced arrangement minimizes radiation. An inductor 19 is arranged to speed up turn-off of transistor 12. Diode 20 and the base-collector diode of transistor 12 provide damping. In Fig. 5 (not shown), the emitter is earthed and the supply E connected between earth and a tapping on the primary winding. Resonant circuit 16, 17 is connected between the upper end of the primary and the lower end of the EHT secondary 4. In Fig. 7 (not shown), the resonant circuit 16, 17 is connected into series with capacitor 13 and the tertiary winding 5 is omitted. Detailed equivalent circuits are provided. Expressions are given for optimum relationship between various parameters. Reference is also made to values of K equal to 1, 3, 5 or 1, 3, 7, but such arrangements are stated to be impracticable and outside the scope of the invention.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7105268A NL7105268A (en) | 1971-04-20 | 1971-04-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1392511A true GB1392511A (en) | 1975-04-30 |
Family
ID=19812958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1759672A Expired GB1392511A (en) | 1971-04-20 | 1972-04-17 | Flyback eht and sawtooth current generator |
Country Status (16)
| Country | Link |
|---|---|
| US (1) | US3769542A (en) |
| AR (1) | AR192768A1 (en) |
| AT (1) | AT320755B (en) |
| BE (1) | BE782337A (en) |
| BR (1) | BR7202458D0 (en) |
| CA (1) | CA953035A (en) |
| CH (1) | CH546021A (en) |
| DE (1) | DE2218702A1 (en) |
| ES (1) | ES401855A1 (en) |
| FR (1) | FR2136558A5 (en) |
| GB (1) | GB1392511A (en) |
| IT (1) | IT958750B (en) |
| NL (1) | NL7105268A (en) |
| OA (1) | OA03999A (en) |
| SE (1) | SE368132B (en) |
| ZA (1) | ZA722504B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4162433A (en) * | 1974-03-28 | 1979-07-24 | U.S. Philips Corporation | Circuit arrangement including a line deflection circuit |
| US3965391A (en) * | 1974-06-04 | 1976-06-22 | General Electric Company | Balanced drive horizontal deflection circuitry with centering |
| GB1530903A (en) * | 1974-12-20 | 1978-11-01 | Rca Corp | Television receiver deflection circuit |
| US4166237A (en) * | 1975-10-20 | 1979-08-28 | North American Philips Corporation | Horizontal deflection circuit for television camera |
| FI61377C (en) * | 1975-12-08 | 1982-07-12 | Hitachi Ltd | HOEGSPAENNINGSGENERATOR |
| US4334173A (en) * | 1980-09-22 | 1982-06-08 | Zenith Radio Corporation | Horizontal width control circuit for image display apparatus |
| GB2166017A (en) * | 1984-10-19 | 1986-04-23 | Philips Electronic Associated | Line output circuit for generating a line frequency sawtooth current |
| JPH01188173A (en) * | 1988-01-22 | 1989-07-27 | Hitachi Ltd | High efficiency horizontal deflecting circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL150297B (en) * | 1967-10-31 | 1976-07-15 | Philips Nv | CIRCUIT, WHICH CONTAINS SWITCHING MEANS FOR THE PERIODIC INTERRUPTION OF A CURRENT SUPPLIED TO A SELF-INDUCTION COIL. |
| DE1955104A1 (en) * | 1968-11-20 | 1970-07-16 | Philips Nv | Circuit arrangement with circuit means for periodically interrupting a current fed to an inductance |
| NL6902807A (en) * | 1969-02-21 | 1970-08-25 |
-
1971
- 1971-04-20 NL NL7105268A patent/NL7105268A/xx unknown
-
1972
- 1972-04-13 ZA ZA722504A patent/ZA722504B/en unknown
- 1972-04-17 SE SE04937/72A patent/SE368132B/xx unknown
- 1972-04-17 CH CH564772A patent/CH546021A/xx not_active IP Right Cessation
- 1972-04-17 IT IT68193/72A patent/IT958750B/en active
- 1972-04-17 CA CA139,786A patent/CA953035A/en not_active Expired
- 1972-04-17 AT AT335872A patent/AT320755B/en not_active IP Right Cessation
- 1972-04-17 GB GB1759672A patent/GB1392511A/en not_active Expired
- 1972-04-18 AR AR241544A patent/AR192768A1/en active
- 1972-04-18 DE DE19722218702 patent/DE2218702A1/en active Pending
- 1972-04-18 US US00245144A patent/US3769542A/en not_active Expired - Lifetime
- 1972-04-18 ES ES401855A patent/ES401855A1/en not_active Expired
- 1972-04-19 BE BE782337A patent/BE782337A/en unknown
- 1972-04-20 BR BR2458/72A patent/BR7202458D0/en unknown
- 1972-04-20 FR FR7214030A patent/FR2136558A5/fr not_active Expired
- 1972-04-20 OA OA54546A patent/OA03999A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SE368132B (en) | 1974-06-17 |
| AT320755B (en) | 1975-02-25 |
| DE2218702A1 (en) | 1972-11-02 |
| US3769542A (en) | 1973-10-30 |
| ES401855A1 (en) | 1975-03-01 |
| OA03999A (en) | 1979-09-15 |
| AR192768A1 (en) | 1973-03-14 |
| BR7202458D0 (en) | 1973-05-31 |
| IT958750B (en) | 1973-10-30 |
| FR2136558A5 (en) | 1972-12-22 |
| CH546021A (en) | 1974-02-15 |
| ZA722504B (en) | 1973-11-28 |
| BE782337A (en) | 1972-10-19 |
| NL7105268A (en) | 1972-10-24 |
| CA953035A (en) | 1974-08-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |