EP0561839B1 - Transformateur h.t. pour postes recepteurs de television - Google Patents

Transformateur h.t. pour postes recepteurs de television Download PDF

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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
Application number
EP91920765A
Other languages
German (de)
English (en)
Other versions
EP0561839A1 (fr
Inventor
Walter Goseberg
Wolfgang Reichow
Hans-Werner Sander
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt GmbH
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Filing date
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Application filed by Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Publication of EP0561839A1 publication Critical patent/EP0561839A1/fr
Application granted granted Critical
Publication of EP0561839B1 publication Critical patent/EP0561839B1/fr
Anticipated expiration legal-status Critical
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    • 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.

Abstract

Dans des transformateurs H.T., notamment des transformateurs divisés à diodes, il est généralement nécessaire de réduire autant que possible les dimensions de l'ensemble du dispositif, pour des raisons de coût et de poids. De même, la déperdition de chaleur pendant le fonctionnement d'un tel transformateur H.T. doit être réduite jusqu'à ce que l'échauffement du transformateur n'atteigne pas une plage de température dans laquelle d'autres parties des circuits d'un poste récepteur de télévision soient endommagées ou affectées. L'objet de l'invention est de réduire les pertes d'un transformateur H.T., notamment de minimiser les pertes électriques. A cet effet, un espace à champ pratiquement nul est créé entre l'enroulement primaire et l'enroulement de haute tension d'un transformateur H.T. du type susmentionné. L'invention s'applique à des postes récepteurs de télévision, notamment des postes récepteurs à haute définition construits selon des normes de télévision de haute définition.

Claims (10)

  1. Transformateur haute tension pour postes récepteurs de télévision comportant un enroulement primaire (3) et, au-dessus de ce dernier, un enroulement secondaire (4), dont les fractions (4a à 4p) sont disposées dans les compartiments (K) d'un support (2) et reliées ensemble par l'intermédiaire de diodes (6), caractérisé en ce que l'enroulement primaire (3) et l'enroulement secondaire (4) sont répartis et polarisés de manière à obtenir des impulsions d'amplitude et de polarité identiques dans les parties des enroulements faisant face (3,4), et à créer un espace à champ pratiquement nul entre les enroulements (3, 4).
  2. Transformateur selon la revendication 1, caractérisé en ce que l'enroulement primaire (3) se présente sous la forme d'un enroulement à spires, composé de plusieurs spires superposées et que l'extrémité (b) de la spire inférieure est prévue pour être reliée à la tension de service (UB) et que l'extrémité (d) de la spire supérieure de l'enroulement est prévue pour être reliée à un commutateur périodique (13).
  3. Transformateur selon la revendication 2, caractérisé en ce que les fractions (4a à 4p) sont polarisées de manière à obtenir une impulsion positive à l'extrémité de l'enroulement au fond d'un compartiment (K).
  4. Transformateur selon la revendication 3, caractérisé en ce que le nombre de compartiments (K) et de fractions (4a à 4p) est tel que l'impulsion positive au fond d'un compartiment (K) présente la même amplitude que l'impulsion positive au niveau de la spire supérieure de l'enroulement primaire (3).
  5. Transformateur selon la revendication 1, caractérisé en ce qu'une diode (6) est reliée à l'extrémité de l'enroulement au fond d'un compartiment (K) par son anode, et à l'extrémité de la spire supérieure de la fraction d'enroulement (4) du compartiment suivant (K) par sa cathode.
  6. Transformateur selon la revendication 1, caractérisé en ce que le début de l'enroulement secondaire (4) constitue la borne (a) délivrant la haute tension (UH).
  7. Transformateur selon la revendication 1, caractérisé en ce que l'enroulement primaire (3) se présente sous la forme de plusieurs fractions d'enroulement (3a à 3c) montées en parallèle et disposées les unes à côté des autres dans le sens axial du support de bobine (2).
  8. Transformateur selon la revendication 1, caractérisé en ce que le transformateur se présente sous la forme d'un « transformateur à séparation par diodes ».
  9. Transformateur selon la revendication 1, caractérisé en ce que le remplissage des compartiments (K) en fractions d'enroulement est proportionné de manière que l'amplitude de l'impulsion au fond du compartiment soit identique à celle de l'impulsion de la spire voisine de l'enroulement primaire (3).
  10. Transformateur selon la revendication 1, caractérisé en ce que le premier compartiment (Ka) et le dernier compartiment (Kp) ne sont remplis qu'à moitié en fractions d'enroulement (4) par rapport aux autres compartiments (Kb à Ko).
EP91920765A 1990-12-10 1991-12-03 Transformateur h.t. pour postes recepteurs de television Expired - Lifetime EP0561839B1 (fr)

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 (fr) 1990-12-10 1991-12-03 Transformateur h.t. pour postes recepteurs de television

Publications (2)

Publication Number Publication Date
EP0561839A1 EP0561839A1 (fr) 1993-09-29
EP0561839B1 true EP0561839B1 (fr) 1997-03-05

Family

ID=6419986

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91920765A Expired - Lifetime EP0561839B1 (fr) 1990-12-10 1991-12-03 Transformateur h.t. pour postes recepteurs de television

Country Status (16)

Country Link
EP (1) EP0561839B1 (fr)
JP (1) JP3280965B2 (fr)
KR (1) KR100194191B1 (fr)
CA (1) CA2098100A1 (fr)
DE (2) DE4039373A1 (fr)
ES (1) ES2097823T3 (fr)
FI (1) FI932627A0 (fr)
HK (1) HK1000744A1 (fr)
HU (1) HUT64660A (fr)
MX (1) MX9102455A (fr)
MY (1) MY107209A (fr)
PT (1) PT99742B (fr)
SG (1) SG46549A1 (fr)
TR (1) TR25836A (fr)
WO (1) WO1992010906A1 (fr)
ZA (1) ZA919724B (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599947A1 (fr) * 1991-08-22 1994-06-08 Deutsche Thomson-Brandt Gmbh Transformateur haute tension a diodes et a enroulements partiels pour recepteur de television
DE4225692A1 (de) * 1992-08-04 1994-02-10 Thomson Brandt Gmbh Hochspannungs-Zeilentransformator für einen Fernsehempfänger
EP0585597B1 (fr) * 1992-08-04 1999-05-12 Deutsche Thomson-Brandt Gmbh Transformateur de ligne à haute tension pour un récepteur de télévision
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665288A (en) * 1970-09-02 1972-05-23 Zenith Radio Corp Television sweep transformer
NL159223C (fr) * 1973-10-10
JPS50109625A (fr) * 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 (fr) * 1986-10-31 1988-05-17
KR0137036B1 (ko) * 1987-05-24 1998-04-28 유진 엠. 휘태커 비디오 장치의 전원 공급 장치

Also Published As

Publication number Publication date
CA2098100A1 (fr) 1992-06-10
WO1992010906A1 (fr) 1992-06-25
MY107209A (en) 1995-10-31
ES2097823T3 (es) 1997-04-16
KR930703789A (ko) 1993-11-30
SG46549A1 (en) 1998-02-20
FI932627A (fi) 1993-06-09
HU9301604D0 (en) 1993-09-28
ZA919724B (en) 1993-04-05
HUT64660A (en) 1994-01-28
JP3280965B2 (ja) 2002-05-13
EP0561839A1 (fr) 1993-09-29
KR100194191B1 (ko) 1999-06-15
PT99742A (pt) 1993-11-30
DE59108593D1 (de) 1997-04-10
PT99742B (pt) 1999-02-26
DE4039373A1 (de) 1992-06-11
MX9102455A (es) 1992-06-01
TR25836A (tr) 1993-09-01
JPH06503448A (ja) 1994-04-14
FI932627A0 (fi) 1993-06-09
HK1000744A1 (en) 1998-04-24

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