EP0193057A2 - Transformateur pour récepteur de télévision - Google Patents

Transformateur pour récepteur de télévision Download PDF

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Publication number
EP0193057A2
EP0193057A2 EP86101957A EP86101957A EP0193057A2 EP 0193057 A2 EP0193057 A2 EP 0193057A2 EP 86101957 A EP86101957 A EP 86101957A EP 86101957 A EP86101957 A EP 86101957A EP 0193057 A2 EP0193057 A2 EP 0193057A2
Authority
EP
European Patent Office
Prior art keywords
winding
transformer according
transformer
core
leg
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.)
Withdrawn
Application number
EP86101957A
Other languages
German (de)
English (en)
Other versions
EP0193057A3 (fr
Inventor
Walter Dipl.-Ing. Goseberg
Uwe Hartmann
Erich Weisser
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Publication of EP0193057A2 publication Critical patent/EP0193057A2/fr
Publication of EP0193057A3 publication Critical patent/EP0193057A3/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • TV receivers generally contain a line output stage with a so-called high-voltage transformer, on the core of which, among other things, the primary winding, the high-voltage winding and, if appropriate, further additional windings lie for the acceptance of pulses. Because of the high transmitted energy for the line deflection and the size of the high voltage generated of approximately 26 to 30 kV, the core of such a line transformer is a relatively expensive and heavy component.
  • a switched-mode power supply contains a so-called isolating transformer, which effects the galvanic isolation of the receiver circuit from the network and from whose secondary windings voltages of different sizes and polarities are taken off via rectifier circuits.
  • This isolating transformer also requires an iron core.
  • the switching power supply feeds, among other things, the sound output stage of the television receiver.
  • the load on the sound amplifier changes. within a wide range around a value of around 70 W. This change in load can have an effect on the line deflection and the high voltage due to the magnetic coupling of the two windings of the power pack and the line transformer.
  • the loading of the flyback transformer is also not constant, but varies depending on the respective image brightness to a value in the order of 30 W. This briefly shortun g may affect the sound reproduction.
  • the invention has for its object to improve the decoupling between the two windings for the power supply and the line transformer in the transformer described and to reduce the opposing effects.
  • the magnetic fluxes generated by the power supply and the line transformer are largely separated from one another, because the magnetic flux of one winding only or almost only flows through the inner leg and because of the high magnetic resistance practically does not flow through the outer leg with the other winding .
  • a change in the load on one of the two windings can therefore have practically no effect on the function of the other winding.
  • the two windings are preferably polarized in such a way that the magnetic fluxes in the inner leg are directed in opposite directions and at least temporarily and partially cancel one another. Then the cross section of the inner leg can be reduced in accordance with the magnetic flux effective there. This is especially true when the power supply and the line transformer are synchronized, i.e. both work at a line frequency of around 16 kHz.
  • FIG. 1 two E-shaped core halves 1, 2 are combined to form a so-called E core, which has two outer legs 3, 4 and an inner leg 5.
  • the outer legs 3.4 are provided with air gaps 6.7 with a length of about 1 mm, while the inner leg 5 has practically no air gap due to the firm joining of the two parts 1,2.
  • the remaining magnetic air gap is only due to the roughness and is of the order of 2-6 / u.
  • the winding 8 for a switching power supply (SMPS) is arranged, while the outer leg 4 carries the winding 9 for the line transformer (PPHV).
  • the windings 8, 9 consist of several separate partial windings.
  • the winding 8 consists, for example, of the primary winding, the so-called feedback winding, the control winding and a series of secondary windings for generating the various operating voltages.
  • the winding 9 consists, for example, of the primary winding of the line transformer, the high-voltage winding and further additional windings for deriving line return pulses.
  • the magnetic flux 01 generated in the outer leg 4 practically only flows over the inner leg 5 because the magnetic resistance of the outer leg 4 is approximately 100 times greater.
  • the magnetic flux ⁇ 2 generated in the outer leg 4 also flows only over the inner leg 5, because the magnetic resistance of the outer leg 3 is approximately 100 times greater than that of the inner leg 5.
  • the windings 8, 8 are polarized so that the magnetic fluxes ⁇ 1, ⁇ 2 cancel each other in the middle leg 5.
  • the compensation of the magnetic fluxes in the inner leg 5 is practically only possible with synchronous operation, ie the same working frequency of the switching power supply and the line transformer, namely the line frequency.
  • the streams through the Windings and thus the magnetic fluxes do not always have the same flux duration and amplitude, so that complete compensation is generally not possible.
  • this compensation is effective at least over a substantial part of the time and for a part of the amplitude.
  • the cross sections of the outer legs 3, 4 are drawn differently to indicate that these cross sections are adapted to the actual magnetic fluxes generated by the windings 8, 9.
  • the cross section of the inner leg 5 is also adapted to the magnetic fluxes which are effective there, so that ferrite material can be saved in particular for the inner leg 5 in synchronous operation.
  • FIG. 2 shows a modification of the core shape of FIG. 1.
  • the two windows formed by the core are dimensioned differently.
  • the geometric dimensions of the core are adapted to the actual values of the magnetic fluxes and the geometric dimensions of the coils. Since the height H2 of the right window is smaller, the height of the entire core is also made smaller by a step or recess.
  • Such a design of the core can further reduce the core material, that is to say the expenditure of ferrite and weight.
  • the electronic switch in the form of transistor 11 is blocked by the control chip applied to its base voltage U 1 according to Fig. 4a.
  • the result is a collector voltage U 2 according to FIG. 4b, the collector current i2 is zero according to FIG. 4c.
  • the stored energy in the horizontal deflection winding 12 and in the primary winding 13 allows a current i4 to flow through the flyback diode 14 (FIG. 4d), so that the tangent capacitor 15 and the capacitor 16 connected in series with the primary winding 13 are charged.
  • a loss compensation current i7 (FIG. 4e) flows from the winding 17 via the diode 18 and charges the capacitor 16.
  • the course of the current i4 is flattened as long as a current i7 flows.
  • the magnetizing current i3 flowing from the winding 13 has its zero crossing (FIG. 4f).
  • the transistor 11 becomes conductive by the control voltage U 1 according to FIG. 4a, and a current i9 flows for recharging the memory inductance 19 (FIG. 4g).
  • the current i7 is zero, so that the current i4 rises more steeply through the diode 14 (FIG. 4d).
  • the magnetizing current i3 becomes positive with a flatter course (FIG. 4f).
  • the conditions in the transformer do not change because the temporal changes in the currents and the magnetic fluxes keep the same direction.
  • the collector current i2 according to FIG. 4c of the transistor 11 increases by the positive portion of the deflection current iA according to FIG. 4h, which passes through the zero point at t3.
  • Current i4 flowing through diode 14 goes to zero at time t3 (FIG. 4d).
  • the transformer according to the invention for example with a circuit according to FIG. 3, is also suitable for devices with a larger power consumption of 50-150 W. Different attenuators are omitted compared to known arrangements. In addition, better efficiency is achieved because the power loss caused by the damping is avoided or reduced. The previously useless power used for damping is usefully returned to the deflection system in the solution according to the invention.
  • the transformer 5 shows the structure of the transformer together with the effective magnetic fluxes 0. It has two outer legs 4 and 3, each provided with an air gap 6.7, on which the windings 19 and 17 of the circuit power supply and the winding 23 for the sound output stage or the primary winding 13 and the secondary winding 24 for generating different operating voltages, a winding 25 for Generation of the high voltage and a winding 26 are arranged to control the driver circuit.
  • the transformer has a middle leg 5 without an air gap, during the period tl-t2 the magnetic flux of the leg 3 closes for the most part via the middle leg 5 without an air gap, thereby largely decoupling the deflection circuit from the power supply circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Details Of Television Scanning (AREA)
  • Television Receiver Circuits (AREA)
  • Dc-Dc Converters (AREA)
EP86101957A 1985-02-21 1986-02-15 Transformateur pour récepteur de télévision Withdrawn EP0193057A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853505976 DE3505976A1 (de) 1985-02-21 1985-02-21 Transformator fuer einen fersehempfaenger
DE3505976 1985-02-21

Publications (2)

Publication Number Publication Date
EP0193057A2 true EP0193057A2 (fr) 1986-09-03
EP0193057A3 EP0193057A3 (fr) 1988-10-19

Family

ID=6263118

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86101957A Withdrawn EP0193057A3 (fr) 1985-02-21 1986-02-15 Transformateur pour récepteur de télévision

Country Status (3)

Country Link
EP (1) EP0193057A3 (fr)
JP (1) JPS61247007A (fr)
DE (1) DE3505976A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0355298A2 (fr) * 1988-08-26 1990-02-28 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holländ. Stiftung & Co. KG. Entrefer dans un transformateur pour une alimentation à découpage
WO2004017338A1 (fr) * 2002-07-19 2004-02-26 Siemens Aktiengesellschaft Composant inductif et utilisation de celui-ci

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3809341A1 (de) * 1988-03-19 1989-10-05 Electronic Werke Deutschland Transformator fuer ein schaltnetzteil
DE3810313A1 (de) * 1988-03-26 1989-10-05 Electronic Werke Deutschland Zeilentransformator fuer einen fernsehempfaenger
DE3824037A1 (de) * 1988-07-15 1990-01-18 Thomson Brandt Gmbh Transformator fuer ein schaltnetzteile
DE3828984A1 (de) * 1988-08-26 1990-03-15 Grundig Emv Geregeltes schaltnetzteil mit hochspannungsgenerator fuer ein fersehgeraet
DE19506719A1 (de) * 1995-02-27 1996-08-29 Thomson Brandt Gmbh Hochspannungstransformator für einen Fernsehempfänger
US6420953B1 (en) * 2000-05-19 2002-07-16 Pulse Engineering. Inc. Multi-layer, multi-functioning printed circuit board
DE102014206469A1 (de) * 2014-04-03 2015-10-08 SUMIDA Components & Modules GmbH Drossel und drosselkern
DE102014117551B4 (de) * 2014-11-28 2021-06-10 Sma Solar Technology Ag Mehrfachdrossel und Leistungswandler mit einer Mehrfachdrossel

Citations (3)

* Cited by examiner, † Cited by third party
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
DE2803540A1 (de) * 1978-01-27 1979-08-02 Blaupunkt Werke Gmbh Bauelement
JPS58220568A (ja) * 1982-06-16 1983-12-22 Toshiba Corp テレビジヨン受像機の電源回路

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4115853Y1 (fr) * 1964-05-30 1966-07-25
US3659191A (en) * 1971-04-23 1972-04-25 Westinghouse Electric Corp Regulating transformer with non-saturating input and output regions
DE2305957C3 (de) * 1973-02-07 1983-11-24 Siemens AG, 1000 Berlin und 8000 München Transformator für ein Sperrwandler-Schaltnetzteil in einem Farbfernseher
GB1551013A (en) * 1975-11-07 1979-08-22 Rca Corp Power supply arrangement with minimum interaction between plural loads
JPS5326925A (en) * 1976-08-26 1978-03-13 Matsushita Electric Ind Co Ltd Horizontal deflection circuit transformer
DE2739503A1 (de) * 1977-09-02 1979-03-08 Licentia Gmbh Zeilentransformator fuer einen fernsehempfaenger
DE2927182C2 (de) * 1979-07-05 1982-09-02 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zur Herstellung eines Transformators, insbesondere eines Zeilentransformators für einen Fernsehempfänger

Patent Citations (3)

* Cited by examiner, † Cited by third party
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
DE2803540A1 (de) * 1978-01-27 1979-08-02 Blaupunkt Werke Gmbh Bauelement
JPS58220568A (ja) * 1982-06-16 1983-12-22 Toshiba Corp テレビジヨン受像機の電源回路

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 74 (E-236)[1511], 6. April 1984; & JP-A-58 220 568 (TOKYO SHIBAURA DENKI K.K.) 22-12-1983 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0355298A2 (fr) * 1988-08-26 1990-02-28 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holländ. Stiftung & Co. KG. Entrefer dans un transformateur pour une alimentation à découpage
EP0355298A3 (fr) * 1988-08-26 1990-08-22 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holländ. Stiftung & Co. KG. Entrefer dans un transformateur pour une alimentation à découpage
WO2004017338A1 (fr) * 2002-07-19 2004-02-26 Siemens Aktiengesellschaft Composant inductif et utilisation de celui-ci
AU2003250792B2 (en) * 2002-07-19 2007-02-15 Siemens Aktiengesellschaft Inductive component and use of said component
US7508290B2 (en) 2002-07-19 2009-03-24 Siemens Aktiengesellschaft Inductive component and use of said component

Also Published As

Publication number Publication date
JPS61247007A (ja) 1986-11-04
DE3505976A1 (de) 1986-08-21
EP0193057A3 (fr) 1988-10-19

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Inventor name: GOSEBERG, WALTER, DIPL.-ING.