EP0236190B1 - Split-Hochspannungstransformator, besonders für Trichrom-Kathodenstrahlröhre - Google Patents

Split-Hochspannungstransformator, besonders für Trichrom-Kathodenstrahlröhre Download PDF

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Publication number
EP0236190B1
EP0236190B1 EP87400244A EP87400244A EP0236190B1 EP 0236190 B1 EP0236190 B1 EP 0236190B1 EP 87400244 A EP87400244 A EP 87400244A EP 87400244 A EP87400244 A EP 87400244A EP 0236190 B1 EP0236190 B1 EP 0236190B1
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EP
European Patent Office
Prior art keywords
transformer
section
point
value
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
EP87400244A
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English (en)
French (fr)
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EP0236190A1 (de
Inventor
Joel Vincent
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Orega Electronique et Mecanique
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Orega Electronique et Mecanique
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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
    • 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 present invention relates to a high voltage transformer in fractional technology, in particular for trichrome cathode ray tube.
  • a tap is taken on the midpoint of one of the sections to take the voltage necessary for the supply of the pre-focusing grids of the cathode ray tube whose anode is supplied by the very high voltage output of the transformer.
  • a transformer is described in Japanese Abstract JP-A-59143477.
  • this voltage taken from the midpoint is a corrugated DC voltage, the voltages at the terminals of the two half-windings of this section being asymmetrical because of the existence of different parasitic capacitances affecting these two half-windings.
  • an additional capacitor can be placed in parallel on the winding with the lowest parasitic capacitance so as to symmetrical the waveforms produced by the two half-windings, but such a solution is not valid for mass production, since it is generally necessary to adapt the value of the additional capacitor to each transformer, the parasitic capacitances of the transformers not being constant for the same production series.
  • the subject of the present invention is a high voltage transformer which, by means which are simple and easy to produce in mass production, has, at the point of connection of a secondary winding, a direct voltage practically free from ripples.
  • the present invention also relates to such a high voltage transformer whose conductor starting from said socket point practically does not radiate any field, even if it is not shielded, and brings practically no stray capacity to the transformer.
  • this tap is carried out at a point of said winding section dividing this section into two parts whose ratio of the number of winding turns is substantially equal to the value of the inverse ratio of the stray capacitances of the two halves of the transformer section.
  • a resistor of high ohmic value preferably at least 1 megohm, is connected directly to this socket.
  • FIG. 1 is a simplified front view of a secondary winding of conventional high voltage transformer winding
  • FIG. 1 is an electrical diagram of the secondary winding of the transformer of Figure 1;
  • FIG. 3 is a diagram of waveforms of the winding of FIG. 2, and
  • FIG. 4 is a simplified front view of a secondary winding of high voltage transformer winding according to the invention.
  • the high voltage transformer described below is intended to supply a three-color cathode ray tube for a television set, but it is understood that the invention can be applied to any high voltage transformer comprising at least one winding section at the "mid" point of which takes a voltage which should be continuous, without the use of rectifier and filter capacitors.
  • the secondary winding 1 of the high voltage transformer shown in the drawing has two winding sections 2,3 physically distinct, arranged on a common support 4, one next to the other.
  • section 3 The end 5 of section 2 furthest from section 3 is intended to be connected to ground, while its other end 6 is connected by a diode 7, fixed on the support 4, at end 8, the closer, from section 3.
  • the other end 9 of section 3 is connected by a diode 10 to an output terminal 11 itself connected to the very high voltage (THT) output cable intended to be connected to the anode of a trichrome cathode ray tube (not shown).
  • TAT very high voltage
  • the capacitance presented by this cathode-ray tube has been symbolized by a capacitor 12 (FIG. 2), forming with the diode 10 a rectifying and smoothing circuit.
  • the focusing voltage U f is taken at a point P located in the middle of section 3. If, for example as shown in the drawing, section 3 has six "wafers" of winding separated by insulating discs, point P is obviously located between the third and the fourth part.
  • Terminals 8 and 9 have parasitic capacitances CP1 and CP2 with respect to the midpoint P respectively.
  • values of 12pF and 6pF were found for CP1 and CP2 respectively.
  • the modules UC1 and UC2 are influenced by different values of CP1 and CP2.
  • FIG. 3 shows the patterns over time of the voltages U6, U8 and U9 at points 6, 8 and 9 respectively, relative to the mass (connected to point 5), the voltage U9 being shifted in time relative to the other two for clarity of the drawing.
  • V o the mean value of the undulated DC voltage in P
  • UR the modulus, compared to the mass, of U6.
  • the value of the module of the DC voltage obtained in point 10 is equal to 2UR, and results from the composition of the three voltages U6, U8 and U9.
  • the taking is carried out at a point 13 determined as follows.
  • 3A be the second winding section (between points 8 and 9) of the secondary 1A comprising such a socket 13 and let 14, 15 be the parts of section 3A between points 8, 13 and 13, 9 respectively.
  • N1 and N2 be the numbers of winding turns of parts 14 and 15 respectively.
  • the parasitic capacities that one would have for the two half-windings between the points 8, P and P, 9 (the point P then being used only for the measurement of these parasitic capacities) being always referenced CP1 and CP2 respectively, the point 13 is such that:
  • point 13 is located at the junction between the second and the third wafers , starting from point 8.
  • a resistor 16 of high value of at least one megohm for example, is connected directly to point 13.
  • This resistor 16 is arranged as close as possible to point 13, and can advantageously be included in the coating of the transformer winding.
  • this resistor 16 prevents the unshielded connecting wire which is connected to it and which carries the focusing voltage V f to the potentiometric block, which can be removed from the transformer, from radiating and disturbing the television set which it team, since this resistance forms, with the parasitic capacities distributed downstream, a filtering circuit. Finally, by appropriately choosing the value of this resistance, one can easily preset the focusing voltage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Details Of Television Scanning (AREA)
  • Regulation Of General Use Transformers (AREA)

Claims (6)

  1. Hochspannungstransformator mit geteilter Wicklung, insbe-sondere für eine Dreifarbenkathodenstrahlröhre,wobei die Sekundärwicklungs mit mindestens einem Wicklungsabschnitt (3A) mit Anzapfung (P) zur Lieferung einer Gleichspannung ohne Zuhilfenahme zusätzlicher Gleichrichterkreise außer den im Transformator vorhandenen Gleichrichterkreisen versehen ist, dadurch gekennzeichnet, daß diese Anzapfung an einem Punkt (13) des Wicklungsabschnitts (3A) erfolgt, der diesen Ab-schnitt in zwei Teile (14, 15) aufteilt, deren Verhältnis der Windungszahlen (N1/N2) im wesentlichen dem Wert des umgekehr-ten Verhältnisses der parasitären Kapazitäten (CP2/CP1) der beiden Hälften des Transformatorabschnitts gleicht.
  2. Transformator nach Anspruch 1, dadurch gekennzeichnet, daß die parasitären Kapazitäten durch Mittelwertsbildung (CP1m und CP2m) der an mehreren Transformatoren einer gleichen Herstel-lungsserie bestimmt werden.
  3. Transformator nach einem der vorhergehenden Ansprüche, mit mehreren "Spulenscheiben" in dem genannten Abschnitt, dadurch gekennzeichnet, daß die Anzapfung an der dem theoretischen Punkt am nächsten liegenden Verbindungsstelle zwischen zwei Spulenscheiben erfolgt.
  4. Transformator nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß an die Abzapfung direkt ein hoch-ohmiger Widerstand (16) angeschlossen ist.
  5. Transformator nach Anspruch 4, dadurch gekennzeichnet, daß der Widerstand eine Größe von mindestens 1 Megaohm besitzt.
  6. Transformator nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, daß der Widerstand in die Umkleidung der Wick-lung des Transformators eingeschlossen ist.
EP87400244A 1986-02-04 1987-02-03 Split-Hochspannungstransformator, besonders für Trichrom-Kathodenstrahlröhre Expired - Lifetime EP0236190B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8601526 1986-02-04
FR8601526A FR2593961B1 (fr) 1986-02-04 1986-02-04 Transformateur haute tension en technologie fractionnee, en particulier pour tube cathodique trichrome

Publications (2)

Publication Number Publication Date
EP0236190A1 EP0236190A1 (de) 1987-09-09
EP0236190B1 true EP0236190B1 (de) 1991-03-20

Family

ID=9331794

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87400244A Expired - Lifetime EP0236190B1 (de) 1986-02-04 1987-02-03 Split-Hochspannungstransformator, besonders für Trichrom-Kathodenstrahlröhre

Country Status (6)

Country Link
US (1) US4858098A (de)
EP (1) EP0236190B1 (de)
JP (1) JP2607434B2 (de)
DE (1) DE3768675D1 (de)
ES (1) ES2021376B3 (de)
FR (1) FR2593961B1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3902219A1 (de) * 1989-01-26 1990-08-02 Electronic Werke Deutschland Kammer-spulenkoerper fuer den hochspannungstransformator eines fernsehempfaengers
FR2682378B1 (fr) * 1991-10-10 1995-04-07 Bellon Laboratoires Nouveaux derives de l'acide fluoroquinoleine carboxylique-3 et leur preparation.
DE4300624A1 (de) * 1993-01-13 1994-07-14 Thomson Brandt Gmbh Dioden-Split-Hochspannungstransformator für einen Fernsehempfänger
US5631815A (en) * 1995-12-12 1997-05-20 Cross; James D. High voltage power supply
DE19728875A1 (de) * 1997-07-07 1999-01-14 Thomson Brandt Gmbh Hochspannungstransformator
US6026004A (en) * 1998-12-21 2000-02-15 Ruanduff Electrical Limited Modular high voltage power supply with integral flux leakage compensation

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1449646A (en) * 1972-11-20 1976-09-15 Matsushita Electric Industrial Co Ltd High voltage generator for television apparatus
US3886434A (en) * 1973-09-07 1975-05-27 Warwick Electronics Inc Flyback transformer
JPS601829B2 (ja) * 1978-01-19 1985-01-17 松下電器産業株式会社 フライバツクトランス
DE2807283A1 (de) * 1978-02-21 1979-08-30 Blaupunkt Werke Gmbh Transformator
US4229787A (en) * 1978-11-30 1980-10-21 Rca Corporation Flyback transformer
NL7901280A (nl) * 1979-02-19 1980-08-21 Philips Nv Inrichting voor het opwekken van hoogspanning.
US4247889A (en) * 1979-02-23 1981-01-27 Blaupunkt-Werke Gmbh High-voltage-secondary transformer, particularly television line transformer
JPS622846Y2 (de) * 1980-02-25 1987-01-22
JPS59143477A (ja) * 1983-02-04 1984-08-17 Victor Co Of Japan Ltd フライパツクトランス
NL8403704A (nl) * 1984-12-06 1986-07-01 Philips Nv Generator voor het opwekken van een hoge gelijkspanning.
US4638220A (en) * 1985-03-04 1987-01-20 General Electric Company High voltage transformer

Also Published As

Publication number Publication date
DE3768675D1 (de) 1991-04-25
EP0236190A1 (de) 1987-09-09
FR2593961B1 (fr) 1988-04-15
JPS62268365A (ja) 1987-11-20
ES2021376B3 (es) 1991-11-01
JP2607434B2 (ja) 1997-05-07
FR2593961A1 (fr) 1987-08-07
US4858098A (en) 1989-08-15

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