EP0738419A1 - Fractionated-rectification high-voltage transformer with grouped diodes - Google Patents
Fractionated-rectification high-voltage transformer with grouped diodesInfo
- Publication number
- EP0738419A1 EP0738419A1 EP95936621A EP95936621A EP0738419A1 EP 0738419 A1 EP0738419 A1 EP 0738419A1 EP 95936621 A EP95936621 A EP 95936621A EP 95936621 A EP95936621 A EP 95936621A EP 0738419 A1 EP0738419 A1 EP 0738419A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- high voltage
- diodes
- transformer
- voltage transformer
- output
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F2027/408—Association with diode or rectifier
-
- 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
- H01F2038/423—Flyback transformers with adjusting potentiometers
Definitions
- the present invention relates to a high voltage transformer with fractional rectification, intended in particular to supply cathode ray tubes for televisions.
- the fractional rectification of the transformer high voltage means that the transformer step-up secondary winding has several high voltage outputs which are each rectified by means of diodes.
- the high voltage transformer In the case of the supply of a cathode ray tube of television set for example, the high voltage transformer must provide a very high output voltage, of the order of 25 to 35 kVolts, to supply the anode of the cathode ray tube ensuring the emission and acceleration of an electron beam for the operation of the tube, and a high output voltage called focusing, of the order of 10 to 12 kVolts, to adjust the concentration of the electron beam in the cathode ray tube.
- the transformer secondary lift winding is in the form of a coil around a substantially tubular support.
- the secondary winding is divided axially at least into three stages by two diodes which are arranged coplanarly opposite the front face of the insulating housing of the transformer, face generally constituted by a potentiometric block connected to the output of focusing voltage.
- the high voltage outputs at the transformer diodes are located at different levels. Since the electrical safety in use of the transformer requires that the distance separating on the one hand the connection points of the high voltage cables with the high voltage outputs of the step-up winding in the transformer housing and on the other hand the immediate environment of the transformer , or sufficiently large (of the order of 2 to 4 cm), the high voltage supply outlet generally located in the upper part of the lifting winding leads to an oversizing in height of the corresponding chimney of the insulating housing surrounding a part the corresponding high voltage cable.
- the object of the present invention is to propose a particularly simple and effective solution to remedy the aforementioned drawbacks by proposing a compact high-voltage transformer with improved electrical connection and heat dissipation characteristics.
- the invention also aims to improve the reliability of the transformer by reducing the operating temperature, in particular at the level of the diodes enclosed in the insulating housing. Another object of the invention is to remove any additional connection element to bring the high voltage supply output to the level of the high voltage focusing output.
- the high-voltage transformer with fractional rectification comprises an insulating housing enclosing a primary winding and a secondary voltage-raising winding which coaxially surrounds the primary winding.
- the lifting winding has axially several stages or partial groupings which are each associated with a diode.
- at least two diodes associated with the high voltage outputs of two different stages are located at the same level (that is to say in the same radial plane), which makes it possible to bring the associated connection points accordingly. to these two output diodes at the same level without any additional connection means.
- the two diodes thus grouped are preferably arranged at the same level, parallel to each other and diametrically opposite and oriented perpendicular to the interior face of the potentiometric block .
- the two output diodes correspond to the diodes associated with the high voltage supply output on the one hand and with the high voltage focusing output on the other hand, respectively, when the high voltage transformer is intended for supply of a television cathode ray tube.
- the two grouped diodes are arranged as low as possible inside the housing, this brings the electrical connection points of the high voltage cables more towards the interior of the housing. Consequently, the height of the chimneys or the length of the resin coating of the cables protruding outside the transformer housing is reduced.
- all the diodes of the lifting winding are arranged away from the potentiometric block. This eliminates the high voltage withstand constraint vis-à-vis the potentiometric block, so as to bring the block closer potentiometric with respect to the lifting winding. It is thus possible to reduce the dimensioning of the transformer in a plane perpendicular to the axis of the primary and secondary winding.
- the dispersion of the diodes of the lifting winding in the insulating housing makes it possible to better distribute the thermal effect generated by these diodes in the housing and therefore to obtain better heat dissipation at the level of the diodes.
- FIG. 1 is a exploded view schematically representing a high voltage transformer according to the state of the art
- FIG. 2 is a partial axial sectional view along ll-ll of Figure 3 showing a high voltage transformer according to a known variant of Figure 1
- - Figure 3 is a partial radial sectional view of the transformer according to III-III in Figure 2
- - Figure 4 is a partial axial section view along IV-IV of Figure 5 showing a high voltage transformer according to the invention
- - Figure 5 is a partial radial section view along V-V of the transformer of Figure 4.
- the high voltage transformer illustrated in FIG. 1 is intended for the supply of a cathode-ray tube of television set (not shown).
- the transformer comprises a rigid casing 1 made of electrically insulating plastic, a primary winding 2 wound around an insulating tubular support 3, a secondary winding 4 voltage booster wound around an insulating tubular support 5, a potentiometric block 6 which is removably mounted on the open front face 1a of the insulating housing 1.
- the transformer is of the fractional rectification type, that is to say of the fractional secondary winding type 4 provided with several high voltage outputs rectified by means of diodes.
- the secondary winding 4 has an upper stage 4a, an intermediate stage 4b and a lower stage 4c ( Figure 2).
- the upper diode 7 associated with the very high voltage output of the transformer is located above the upper stage 4a of the secondary winding 4.
- the intermediate diode 8 and the lower diode 9 respectively separate the upper stage 4a from the intermediate stage 4b, and the intermediate stage 4b of the lower stage 4c of the secondary winding 4.
- the lower diode 9 is associated with a so-called focusing high voltage output.
- the diodes 7, 8, 9 are arranged in a coplanar manner and supported by clip arms 10 made of insulating plastic material forming part of the tubular support 5.
- Electrical connectors 11 in the form of pins are connected to the primary winding 2 and possibly to auxiliary windings, not shown, which, arranged coaxially inside the tubular support 3, supply voltages of low values for the supply of other TV electrical circuits not shown.
- the technique of coaxial windings is known in particular from French Patent No. 2,632,798.
- the primary winding 2 is introduced coaxially inside the support tube 5 for the secondary winding 4 in order to '' obtain a good magnetic coupling between the primary 2 and secondary 4 windings.
- Two high voltage cables 12, 13 are electrically and respectively connected to the very high voltage output at the upper diode 7 to the potentiometric block 6 which is connected and to the high voltage output at the lower diode 9.
- the high voltage cable 12 is held by means of a clip 14 forming part of the insulating support 5.
- the cable 12 is intended to supply the anode of the cathode-ray tube of the television set to emit a beam of electrons required to operate the TV.
- the high voltage cable 13 connects the potentiometric block 6 of the transformer to the cathode ray tube in order to focus the electron beam emitted by the anode.
- the high voltage output at the lower diode 9 is connected to the potentiometric block 6 which can adjust by means of one or two rotary knobs 6a, 6b (FIG. 2) the output voltage (s) actually conveyed by the high voltage cable 13.
- the insulating case 1 must be hermetically closed.
- the coplanar diodes 7, 8, 9 are located opposite the potentiometric block 6.
- the electrical safety for ensuring the operation of the surrounding circuits (not shown) against parasitic signals generated by the high output voltage of the transformer, requires that the connection points between the high voltage cables 12, 13 inside the insulating housing 1 are separated from the outside by a certain safety distance.
- the high-voltage cables 12, 13 are coated with an insulating resin 15 up to a predetermined height outside the housing 1 of the transformer. The height of the resin coating 15 depends on the value of the high output voltages.
- FIGS 2 and 3 show a known variant of the high voltage transformer which differs from that illustrated in Figure 1 essentially for the electrical connections between the high voltage outputs of the secondary winding 4 and the high voltage cables 12, 13.
- the same elements of the transformer illustrated in different figures will bear the same references.
- the high voltage transformer comprises an insulating housing 1 provided with two integrated chimneys 16, 17 projecting towards the outside of the housing 1 in order to respectively receive the high voltage cables 12, 13 of FIG. 1 (not shown in Figures 2 and 3).
- the chimneys 16,17 replace the insulating coating 15 of FIG. 1 in order to ensure the required electrical safety.
- the chimneys 16,17 also protrude towards the inside of the housing 1 and have their lower ends each closed by a tablet 18, 19 made of silicone loaded with conductive powder.
- the technique of electrical connection by means of conductive pads is described in detail in European Patent No. 0 236 642.
- the high voltage cables (not shown in Figures 2 and 3) have a rigid core which can sink into the upper faces of the conductive pads 18, 19 in the chimneys 16, 17.
- the potentiometric block 6 is mounted on the front face of the insulating housing 1 and comprises two rotary knobs 6a, 6b in order to adjust two output voltages for focusing and acceleration in a manner known per se.
- the potentiometric block 6 includes a small chimney 6c for the outlet of an auxiliary cable not shown.
- the chimneys 16, 17 are located in the vicinity of the front face of the insulating housing 1.
- the diodes 7, 8, 9 respectively associated with the upper 4a, intermediate 4b and lower 4c stages of the secondary winding 4 found in a plane parallel to the front face of the insulating box 1.
- the potentiometric block 6 it is necessary to take into account the voltage withstand of the transformer. Concretely, the distance I separating the diodes 7, 8, 9 and the potentiometric block 6 must be large enough to avoid the phenomenon of production of electric arcs due to the high output voltage and which can cause the destruction of the transformer.
- extension lugs 20, 21 are difficult to assemble and to arrange for the high voltage which must pass through them. These lugs also increase the size inside the insulating housing 1.
- FIGs 4 and 5 show an embodiment of the high voltage transformer according to the present invention. The example is provided in comparison with the variant illustrated in Figures 2 and 3.
- the secondary winding 4 always comprises three stages 4a,
- the intermediate 8 ′ and lower 9 ′ diodes are coplanar and form a right angle with the front face of the insulating block 1 constituted by the potentiometric block 6.
- the diode 7 ′ associated with the upper stage 4a for the very high voltage output is arranged in the same radial plane as the lower diode 9 ′, parallel to it and diametrically opposite to it.
- the diodes 7 ', 8', 9 ' are held by means of the clip arms 10 in a manner known per se. To ensure the electrical connection between the diode 7 'and the upper stage 4a, it suffices to extend the conductor of the upper stage 4a downwards to be connected by one of the ends of the diode 7' which is associated with it .
- the intermediate diode 8 ' is coplanar with the lower diode 9'.
- the diodes 7 ′, 8 ′, 9 ′ according to the invention also makes it possible to eliminate the additional extension lugs 20, 21 for the electrical connection of the associated high voltage outputs.
- the diode 7 'associated with the upper stage 4a and the diode 9' associated with the lower stage 4c of the secondary winding 4 have ends oriented parallel so that one can take advantage of it to ensure the electrical connection. It suffices to bend these sufficiently rigid conductive ends and to push them respectively into the underside of the conductive pads 18, 19 of the chimneys 16, 17.
- Such a connection which is extremely simple makes it possible to improve the electrical behavior of the transformer by elimination of any parasitic phenomena linked to the mounting and location of the electrical extension lugs 20,21.
- the invention is not limited to a secondary winding with three stages.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
- Details Of Television Scanning (AREA)
- Rectifiers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9413332A FR2726686B1 (en) | 1994-11-07 | 1994-11-07 | HIGH VOLTAGE TRANSFORMER WITH FRACTIONAL RECTIFICATION WITH CLUSTERED DIODES |
FR9413332 | 1994-11-07 | ||
PCT/FR1995/001427 WO1996014645A1 (en) | 1994-11-07 | 1995-10-27 | Fractionated-rectification high-voltage transformer with grouped diodes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0738419A1 true EP0738419A1 (en) | 1996-10-23 |
EP0738419B1 EP0738419B1 (en) | 2000-05-10 |
Family
ID=9468584
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95936621A Expired - Lifetime EP0738419B1 (en) | 1994-11-07 | 1995-10-27 | Fractionated-rectification high-voltage transformer with grouped diodes |
Country Status (7)
Country | Link |
---|---|
US (1) | US6133698A (en) |
EP (1) | EP0738419B1 (en) |
JP (1) | JPH10512713A (en) |
DE (1) | DE69516842T2 (en) |
FR (1) | FR2726686B1 (en) |
TW (1) | TW278306B (en) |
WO (1) | WO1996014645A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6552641B1 (en) * | 1999-07-27 | 2003-04-22 | Thomson Licensing S.A. | Transformer, especially for powering cathode ray tubes |
CN107068366B (en) * | 2017-05-12 | 2019-02-26 | 天晟电气股份有限公司 | A kind of sub-connecting switch of transformer lead frame |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5532083U (en) * | 1978-08-24 | 1980-03-01 | ||
JPS5938027Y2 (en) * | 1979-05-02 | 1984-10-22 | 株式会社日立製作所 | flyback transformer |
JPS608412Y2 (en) * | 1980-03-12 | 1985-03-25 | 三洋電機株式会社 | flyback transformer |
JPS5835910A (en) * | 1981-08-28 | 1983-03-02 | Hitachi Ltd | Ignition coil-built-in with high voltage diode |
DE3800477A1 (en) * | 1988-01-11 | 1989-07-20 | Graetz Nokia Gmbh | HIGH VOLTAGE TRANSFORMER FOR TELEVISIONS |
JPH07118404B2 (en) * | 1990-08-13 | 1995-12-18 | 株式会社村田製作所 | Flyback transformer and manufacturing method thereof |
KR100235814B1 (en) * | 1991-08-22 | 1999-12-15 | 루엘랑 브리지뜨 | Diode split high voltage transformer for a television receiver |
-
1994
- 1994-11-07 FR FR9413332A patent/FR2726686B1/en not_active Expired - Fee Related
-
1995
- 1995-10-27 JP JP8515086A patent/JPH10512713A/en not_active Ceased
- 1995-10-27 DE DE69516842T patent/DE69516842T2/en not_active Expired - Fee Related
- 1995-10-27 WO PCT/FR1995/001427 patent/WO1996014645A1/en active IP Right Grant
- 1995-10-27 US US08/666,488 patent/US6133698A/en not_active Expired - Fee Related
- 1995-10-27 EP EP95936621A patent/EP0738419B1/en not_active Expired - Lifetime
-
1996
- 1996-01-10 TW TW085100216A patent/TW278306B/zh active
Non-Patent Citations (1)
Title |
---|
See references of WO9614645A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE69516842T2 (en) | 2000-12-07 |
TW278306B (en) | 1996-06-11 |
EP0738419B1 (en) | 2000-05-10 |
DE69516842D1 (en) | 2000-06-15 |
JPH10512713A (en) | 1998-12-02 |
FR2726686B1 (en) | 1996-12-20 |
US6133698A (en) | 2000-10-17 |
FR2726686A1 (en) | 1996-05-10 |
WO1996014645A1 (en) | 1996-05-17 |
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