EP0561839B1 - Hochspannungstransformator für einen fernsehempfänger - Google Patents
Hochspannungstransformator für einen fernsehempfänger Download PDFInfo
- Publication number
- EP0561839B1 EP0561839B1 EP91920765A EP91920765A EP0561839B1 EP 0561839 B1 EP0561839 B1 EP 0561839B1 EP 91920765 A EP91920765 A EP 91920765A EP 91920765 A EP91920765 A EP 91920765A EP 0561839 B1 EP0561839 B1 EP 0561839B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- winding
- transformer according
- transformer
- cells
- voltage
- 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 - Lifetime
Links
- 238000004804 winding Methods 0.000 claims description 75
- 230000005684 electric field Effects 0.000 claims 1
- 230000000737 periodic effect Effects 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000004323 axial length Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002500 effect on skin Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000005534 acoustic noise Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/42—Flyback transformers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/02—Coils wound on non-magnetic supports, e.g. formers
- H01F2005/022—Coils wound on non-magnetic supports, e.g. formers wound on formers with several winding chambers separated by flanges, e.g. for high voltage applications
Definitions
- the invention is based on a high-voltage transformer according to the preamble of claim 1.
- a transformer is known from DE-OS 35 14 308.
- Such transformers generate a high voltage for television receivers in the order of 25 kV.
- the object of the invention is to reduce the power loss occurring at the transformer in such a high-voltage transformer. This object is achieved by the invention specified in claim 1. Advantageous developments of the invention are specified in the subclaims.
- the invention is initially based on an analysis of the total loss types occurring in such a transformer.
- a first type of loss consists in the ferrite losses due to magnetization of the core in accordance with the area formed by the hysteresis curve. Such losses can only be reduced by ferrite material of higher quality.
- a second type of loss consists of copper losses due to the ohmic resistance of the wire and the skin effect.
- a third type of loss is the loss in the high voltage rectifier diode due to the forward voltage and the forward current, the reverse voltage and the reverse current and the switch losses when switching from the blocked to the conductive state and vice versa.
- a fourth type of loss consists of dielectric losses due to displacement currents in the dielectric generally formed by a potting resin.
- the first three types of loss have lower limits, particularly for technological reasons and due to the available components.
- the invention now turns to the fourth type of loss.
- the invention is based on the following consideration.
- the dielectric losses occur in particular in the area between the primary winding and the secondary winding or high-voltage winding because the greatest voltage differences exist here. If it is possible to make this area largely electrically free of fields, the dielectric losses can be reduced considerably. In the invention, this is achieved only by a particularly advantageous division of the pulse voltages on the primary winding and on the secondary winding, in such a way that in the area mentioned on the primary winding and on the secondary winding, the pulses have approximately the same amplitude and polarity.
- the difference in the pulse voltages on the two windings practically disappears, so that in the desired manner an electrically field-free space is achieved and losses due to dielectric displacement currents are largely avoided.
- a major advantage is that the field-free space is not achieved by additional means, but only by a clever arrangement of the parts that are required anyway.
- the harmonic content of the generated voltages is also reduced by the reduction of the dielectric displacement currents in the dielectric surrounding the windings. This leads to fewer natural resonances that are otherwise triggered by displacement currents. This reduction in harmonics causes an improvement in the internal resistance and also a reduction in the acoustic noises occurring at the transformer. Overall, the material surrounding the windings, preferably a cast resin, is also less stressed.
- the bobbin 7 is supported on the core 1, which carries the primary winding 3.
- the primary winding 3 consists of six layers.
- the winding end from the lower layer is connected to terminal b with the operating voltage + UB.
- the winding end from the upper layer is connected to terminal d and to switching transistor 13, which is controlled at terminal c with a line-frequency switching voltage Z.
- the pulse voltage at terminal b is zero.
- the pulse voltage at terminal d has the full value of the return voltage of +1200 volts. The pulse voltage thus increases continuously from winding to winding from the value zero at terminal b to the maximum value at terminal d.
- the pulse voltage over the axial length of the upper layer of the winding 3 decreases by about 16% and the pulse voltage at the right end of the upper layer is +1000 volts.
- the pulse voltage is therefore largely constant in the upper position of the winding 3 over the axial length of the coil body 7 and has an average value of 1100 volts.
- the chamber coil former 2 Arranged above the coil former 7 with the primary winding 3 is the chamber coil former 2, which has a total of 16 chambers Ka to Kp formed by walls 8, which are filled with partial windings 4a to 4p of the secondary winding or high-voltage winding 4.
- the winding end from the upper layer of the first partial winding 4a is connected to earth.
- the winding end at the bottom of a chamber K is one with the anode High-voltage rectifier diode 6 connected, the cathode of which is connected in each case to the winding end from the upper end of the next partial winding 4.
- the end of the winding from the bottom of the last partial winding 4p in the bracket Kp forms the high-voltage terminal a.
- the winding process for the entire secondary winding 4 begins at the bottom of the chamber Kp. Since there is a diode 6 between each two chambers, a total of 15 diodes 6 are provided for a total of 16 chambers K. A high voltage UH of 32 kV develops at terminal a. With these assumed values, there is a pulse of +1100 volts at the bottom of a chamber K, which is the same in all chambers. At the upper end of winding 4 there is a pulse of -1300 volts.
- the high-voltage winding 4 also produces pulses with the constant amplitude of +1100 volts in the area assigned to the winding 3, that is to say in the area of the lower ends of the chambers.
- the pulses on the winding 3 and on the winding 4 are also simultaneous. There is therefore practically no voltage difference between the pulses on the winding 3 and the pulses on the winding 4, so that the electrically field-free space indicated by the dash-dotted line F results.
- the pulses at the upper end of the windings 4 have the wrong negative polarity to form the field-free space. However, the pulses there are so far removed from the primary winding 3 that they no longer cause any significant displacement currents through the dielectric.
- the upper end of the first winding 4a is grounded and therefore carries no pulse voltage, while on the other hand the lower end of the last winding 4p, which is grounded via the capacitance of the picture tube, also does not carry any pulse voltage.
- the tension ratios of these two windings are therefore different from that of the other windings 4b to 4o.
- the primary winding 3 is preferably wound from stranded wire in order to keep the losses due to the skin effect low.
- FIG. 2 shows the equivalent circuit diagram belonging to FIG. 1.
- the capacitor 14, which is essentially formed by the anode coating of the picture tube 15, is connected to the terminal a carrying the high voltage UH.
- the diode 6b thus corresponds in FIG. 1 to the first diode between the bottom of the chamber Ka and the winding end at the upper end of the chamber Kb.
- the last diode 6p corresponds to the diode between the lower end of the winding of the chamber Ko and the upper winding end of the last Chamber Kp.
- the primary winding 3 it is also possible to divide the primary winding 3 into a plurality of sub-windings which are axially adjacent to one another on the core 1 and are connected in parallel between the terminals b and d.
- the amplitude at the upper layer of the primary winding 3 is different over the axial length. This can be taken into account in that the chambers Ka to Kp are filled correspondingly differently, so that the pulses of the partial windings 4a to 4p each have correspondingly different amplitudes at the bottom of the chamber.
- the filling factor of the chambers K with the partial windings 4 would then decrease from the left to the right end of the coil formers 7.2 as the amplitude of the pulses at the upper layer of the winding 3 also decreases, in FIG. 1 from +1200 volts to + 1000 volts.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
- Details Of Television Scanning (AREA)
- Television Receiver Circuits (AREA)
- Coils Of Transformers For General Uses (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4039373A DE4039373A1 (de) | 1990-12-10 | 1990-12-10 | Hochspannungstransformator |
DE4039373 | 1990-12-10 | ||
PCT/EP1991/002285 WO1992010906A1 (de) | 1990-12-10 | 1991-12-03 | Hochspannungstransformator für einen fernsehempfänger |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0561839A1 EP0561839A1 (en) | 1993-09-29 |
EP0561839B1 true EP0561839B1 (de) | 1997-03-05 |
Family
ID=6419986
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91920765A Expired - Lifetime EP0561839B1 (de) | 1990-12-10 | 1991-12-03 | Hochspannungstransformator für einen fernsehempfänger |
Country Status (16)
Country | Link |
---|---|
EP (1) | EP0561839B1 (hu) |
JP (1) | JP3280965B2 (hu) |
KR (1) | KR100194191B1 (hu) |
CA (1) | CA2098100A1 (hu) |
DE (2) | DE4039373A1 (hu) |
ES (1) | ES2097823T3 (hu) |
FI (1) | FI932627A (hu) |
HK (1) | HK1000744A1 (hu) |
HU (1) | HUT64660A (hu) |
MX (1) | MX9102455A (hu) |
MY (1) | MY107209A (hu) |
PT (1) | PT99742B (hu) |
SG (1) | SG46549A1 (hu) |
TR (1) | TR25836A (hu) |
WO (1) | WO1992010906A1 (hu) |
ZA (1) | ZA919724B (hu) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
HU215312B (hu) * | 1991-08-22 | 1998-11-30 | Deutsche Thomson-Brandt Gmbh. | Diódákkal megosztott nagyfeszültségű transzformátor televízió vevőkészülékhez |
DE4225692A1 (de) * | 1992-08-04 | 1994-02-10 | Thomson Brandt Gmbh | Hochspannungs-Zeilentransformator für einen Fernsehempfänger |
ATE180101T1 (de) * | 1992-08-04 | 1999-05-15 | Thomson Brandt Gmbh | Hochspannungs-zeilentransformator für einen fernsehempfänger |
DE19510678A1 (de) * | 1995-03-27 | 1996-10-02 | Thomson Brandt Gmbh | Hochspannungstransformator für einen Fernsehempfänger |
FR2783965B1 (fr) * | 1998-09-30 | 2000-12-29 | Thomson Television Components | Transformateur haute tension |
DE19900111A1 (de) * | 1999-01-05 | 2000-07-06 | Thomson Brandt Gmbh | Diodensplitt-Hochspannungstransformator |
JP5950655B2 (ja) * | 2012-04-02 | 2016-07-13 | 三菱電機株式会社 | フライバックトランス |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3665288A (en) * | 1970-09-02 | 1972-05-23 | Zenith Radio Corp | Television sweep transformer |
NL159223C (hu) * | 1973-10-10 | |||
JPS50109625A (hu) * | 1974-02-04 | 1975-08-28 | ||
DE3033979A1 (de) * | 1980-09-10 | 1982-04-22 | Blaupunkt-Werke Gmbh, 3200 Hildesheim | Transformator |
JPS60172319U (ja) * | 1984-04-21 | 1985-11-15 | 株式会社村田製作所 | フライバツクトランス |
JPS6374083U (hu) * | 1986-10-31 | 1988-05-17 | ||
CA1292561C (en) * | 1987-05-27 | 1991-11-26 | Leroy William Nero | Isolating high voltage transformers for video apparatus |
-
1990
- 1990-12-10 DE DE4039373A patent/DE4039373A1/de not_active Withdrawn
-
1991
- 1991-12-03 SG SG1996005830A patent/SG46549A1/en unknown
- 1991-12-03 WO PCT/EP1991/002285 patent/WO1992010906A1/de active IP Right Grant
- 1991-12-03 CA CA002098100A patent/CA2098100A1/en not_active Abandoned
- 1991-12-03 KR KR1019930701737A patent/KR100194191B1/ko not_active IP Right Cessation
- 1991-12-03 HU HU9301604A patent/HUT64660A/hu unknown
- 1991-12-03 JP JP51869891A patent/JP3280965B2/ja not_active Expired - Fee Related
- 1991-12-03 EP EP91920765A patent/EP0561839B1/de not_active Expired - Lifetime
- 1991-12-03 ES ES91920765T patent/ES2097823T3/es not_active Expired - Lifetime
- 1991-12-03 DE DE59108593T patent/DE59108593D1/de not_active Expired - Fee Related
- 1991-12-09 MY MYPI91002277A patent/MY107209A/en unknown
- 1991-12-09 MX MX9102455A patent/MX9102455A/es not_active IP Right Cessation
- 1991-12-09 TR TR91/1196A patent/TR25836A/xx unknown
- 1991-12-10 PT PT99742A patent/PT99742B/pt not_active IP Right Cessation
- 1991-12-10 ZA ZA919724A patent/ZA919724B/xx unknown
-
1993
- 1993-06-09 FI FI932627A patent/FI932627A/fi not_active Application Discontinuation
-
1997
- 1997-12-08 HK HK97102361A patent/HK1000744A1/xx not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
HUT64660A (en) | 1994-01-28 |
WO1992010906A1 (de) | 1992-06-25 |
TR25836A (tr) | 1993-09-01 |
ES2097823T3 (es) | 1997-04-16 |
ZA919724B (en) | 1993-04-05 |
JP3280965B2 (ja) | 2002-05-13 |
MY107209A (en) | 1995-10-31 |
KR930703789A (ko) | 1993-11-30 |
EP0561839A1 (en) | 1993-09-29 |
KR100194191B1 (ko) | 1999-06-15 |
DE4039373A1 (de) | 1992-06-11 |
MX9102455A (es) | 1992-06-01 |
PT99742B (pt) | 1999-02-26 |
HK1000744A1 (en) | 1998-04-24 |
DE59108593D1 (de) | 1997-04-10 |
SG46549A1 (en) | 1998-02-20 |
JPH06503448A (ja) | 1994-04-14 |
CA2098100A1 (en) | 1992-06-10 |
FI932627A0 (fi) | 1993-06-09 |
HU9301604D0 (en) | 1993-09-28 |
FI932627A (fi) | 1993-06-09 |
PT99742A (pt) | 1993-11-30 |
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