CA1051985A - High-voltage transformer comprising a foil winding - Google Patents
High-voltage transformer comprising a foil windingInfo
- Publication number
- CA1051985A CA1051985A CA237,842A CA237842A CA1051985A CA 1051985 A CA1051985 A CA 1051985A CA 237842 A CA237842 A CA 237842A CA 1051985 A CA1051985 A CA 1051985A
- Authority
- CA
- Canada
- Prior art keywords
- winding
- voltage
- voltage winding
- low
- foil
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
- H01F30/10—Single-phase transformers
-
- 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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2847—Sheets; Strips
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/08—Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators
- H01F29/12—Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators having movable coil, winding, or part thereof; having movable shield
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The low-voltage winding of a line transformer consists of a foil winding. In order to tune the line transformer to the third or the fifth harmonic, the coupling factor is adjusted by sliding the high-voltage winding with respect to the low-voltage winding. The length of the leg of the core whereabout the low-voltage winding and the high-voltage winding are arranged substantially exceeds thewidth of the low-voltage winding. The high-voltage winding can be partly slid off the low-voltage winding, with the result that the coupling factor is reduced.
The low-voltage winding of a line transformer consists of a foil winding. In order to tune the line transformer to the third or the fifth harmonic, the coupling factor is adjusted by sliding the high-voltage winding with respect to the low-voltage winding. The length of the leg of the core whereabout the low-voltage winding and the high-voltage winding are arranged substantially exceeds thewidth of the low-voltage winding. The high-voltage winding can be partly slid off the low-voltage winding, with the result that the coupling factor is reduced.
Description
105198~
The invention relates to a high-vol-taKe transforrner, notably a line transformer for a television receiver, comprising a ferromagnetic core which consists of two yokes which are interconnected by two legs, at least one low-voltage winding which encloses one of the legs, and one high-voltage winding which is arranged on the low-voltage winding.
It is to be noted that the terms low-voltage winding, high-voltage winding and other windings as used above and hereinafter always rerer solely to the conductive portion of what is normally referred to as a "winding".
ln A high-voltage transformer of this kind is known from the magazine Funk-Technik, 1974, No. 11, page 396 and further.
Windings of a high-voltage transformer are usually made of brass-wire. It was found to be advantageous to make transformer windings of metal foil. Only a comparatively low voltage is then present between the successive conductive foil layers, with the result that the insulating layer between the successive foil layers must satisfy only minimum require-ments. Furthermore, tappings can be made substantially simpler in the case of foil windings than in the case ., ~fl,~ / 7'~
~, . 1 () . 'i ,-J
of` wire wil-ldi~ s. ~`llis iS notabLy impor~all~ Ior t~le low-~o:Ltage ~ ing of a lil~c trarlsformer for a tele-ViSiOII recei~rer, bocallse therel`rom an increasing num-bel of voltages whlch are elsewhere required in the roceiver are tapped.
From the said article it is also Xnown to obtain an as high as possible yield from a line trans-former by tunillg to the third or fifth harmonic. Tun-~` ing can be effected by making the coupling factor, de-termining the magnetic coupling between the transformer windings, adjustable. It is known~that in wire-wound transformers the coupling factor can be changed by axial displacement of the high-voltage winding with respect to the low-voltage winding. Due to the dis-placelllent of the high-voltage winding, the field generated by the low-voltage winding is enclosed more or less by the high-voltage winding than before displacement of the latter. This constitutes the variation of the coupling factor. Foil-wound transformers have a de-viating magnetic stray field with respect to wire-wound transformers, so that for foil transformers the same adjustability of the coupling factor cannot be obtained without further steps being taken.
The invention is based on the recognition of the difference in the build-up of the magnetic stray ficld of the foil winding and that of a wire winding. Due to the distance between the wires of a 10519~5 winding layer which is necessary for insulation, the field lines of the neighbouring magnetic field are curved more on the side of a wire winding than the field lines on the side of a foil winding, because the field lines are parallel to the conductive closed surface of the foils. The field lines of the magnetic field of a foil winding, however, are substantially curved at the end face of the winding.
This device permits the realization of a high-voltage transformer which offers the advantages of a foil winding and which is also tunable in the described manner.
In accordance with this invention there is provided a high-voltage transformer~ notably a line transformer for a television receiver, comprising a ferromagnetic core which consists of two yokes which are interconnected by two legs, at least one low-voltage winding which encloses one of the legs, and one high-voltage winding which is arranged on the low-voltage winding, characterized in that the low-voltage winding is a foil winding, the length of the leg whereabout the low-voltage winding and the high-voltage winding are arranged being substantially larger than the width of the foil winding, said high voltage winding being movable in the direction of the axis of the leg about which it is arranged.
The invention will be described in detail hereinafter with reference to a drawing.
Figure 1 is a diagrammatic view of a preferred embodiment of a high-voltage transformer according to the invention, and Figure 2 is a diagrammatic view of a further embodiment of a high-voltage transformer according to the invention.
In Figure 1, a foil winding 2 is arranged about a core 1. The layers of the winding 2 are insulated from each other by an insulating tape of '' ' '~
l>'~`. 77'l'~
X,1~J.75 1~51985 A syllt}letic nlatcrial~ for exam~le, a~Mylar roil whi.ch is to be WO(IIICI SilllUlt.lllCOllSly Wit}l a conductive foil. The nei~hbol~ing field linos 3 of tlle magnetic f'ield, ge-nerated by the windillg 2 are substantially curved near the head 5 of thc willding 2 (in the area A), extend approxilllately parallel to the winding 2 in the area B, and arQ substantially curved again on the lower erld 9 o~ the winding 2 (in the area C). Because the foil used in the wi.nding 2 forms an uninterrupted conductive surface, the field lines in the central portion B must extend parallel to the winding 2. In the areas ~ and C, the field lines must be substan-tially curved, because the field lines'3 in the in~
sulating layers of the winding 2 (not shown) also 1$ extend parallel to the winding 2. The axial displace-ment of a high-voltage winding 7 along the foil wind-ing 2 would cause hardly any change in the magnetic field enclosed by the high-voltage winding 7 i,f the lo~r voltage winding 2 were to have a width approxi-matiIIg the length of the leg 6. The arrangement shown and the dimensions of the various components of the higll-voltage transformer enable the coupling factor to be adjusted withill reasonable limits. The width h2 of the alurninium foil of the winding 2 is substan-tially smaller than the distance hl between the two yokes 4 and 4~ of the core 1.
When the high-voltagc winding 7 in Fig. 1 e /~
I'll?i /', 'j ~, 10.75 105~985 i5 s:Lid from t~he so(ctor 13 :into l,he sector A, a cliIferent i.nterscctioll of the :field l:inos 3, and hence a differen-t enclosllro Or 1;he magne-tic fiold, is obta:ine(l, with the resu:l.t that the coupling ractor can be adjusted within S ~;iVOll l~ i t s ~
!; F`ig. 2 diagr.~mnatically S}IOWS a second em-I)odilllont o:E` a lino transforlller 20. Abollt a leg 26 there :is arrallged a foil winding, wllich consist,s of two portions 22 and 22', The -I,wo porti.ons 22 and 22' are s:i~nul.taneous-A lo ly wound in a~My~.clr foil, Tlle central portion 28 about tlle leg 26 is free :t`rom condllctive material and merely consists of insulating foil. The two portions 22 and 22' can be connec-ted in series as well as in parallel, The line trans~ormer 20 can be tuned by sliding the high-voltage winding 27 with respect to the low-voltage willdings 22 and 22'. The width of the foil winding is now to be understood to be the sum of the widths h22 and h22t of the low-voltage windings 22 and 22'.
Wllat is applicable to hl and h2 in Fig. 1, is applicable to hl2 and h22 plus h22t in Fi.g. 2.
It was found that ~hen the leg acconmlodating the lo~-voltage and high-voltage windings has a length e.~;:ceedillg the width of` the f`oil winding increased by four millillletre, the coupling factor can already be properly adjusted.
It was also found that the length o the latl,er leg need not be larger than the sum o:t` the ~idths o:l` the foil winding and the high-voltage winding.
-- f.
The invention relates to a high-vol-taKe transforrner, notably a line transformer for a television receiver, comprising a ferromagnetic core which consists of two yokes which are interconnected by two legs, at least one low-voltage winding which encloses one of the legs, and one high-voltage winding which is arranged on the low-voltage winding.
It is to be noted that the terms low-voltage winding, high-voltage winding and other windings as used above and hereinafter always rerer solely to the conductive portion of what is normally referred to as a "winding".
ln A high-voltage transformer of this kind is known from the magazine Funk-Technik, 1974, No. 11, page 396 and further.
Windings of a high-voltage transformer are usually made of brass-wire. It was found to be advantageous to make transformer windings of metal foil. Only a comparatively low voltage is then present between the successive conductive foil layers, with the result that the insulating layer between the successive foil layers must satisfy only minimum require-ments. Furthermore, tappings can be made substantially simpler in the case of foil windings than in the case ., ~fl,~ / 7'~
~, . 1 () . 'i ,-J
of` wire wil-ldi~ s. ~`llis iS notabLy impor~all~ Ior t~le low-~o:Ltage ~ ing of a lil~c trarlsformer for a tele-ViSiOII recei~rer, bocallse therel`rom an increasing num-bel of voltages whlch are elsewhere required in the roceiver are tapped.
From the said article it is also Xnown to obtain an as high as possible yield from a line trans-former by tunillg to the third or fifth harmonic. Tun-~` ing can be effected by making the coupling factor, de-termining the magnetic coupling between the transformer windings, adjustable. It is known~that in wire-wound transformers the coupling factor can be changed by axial displacement of the high-voltage winding with respect to the low-voltage winding. Due to the dis-placelllent of the high-voltage winding, the field generated by the low-voltage winding is enclosed more or less by the high-voltage winding than before displacement of the latter. This constitutes the variation of the coupling factor. Foil-wound transformers have a de-viating magnetic stray field with respect to wire-wound transformers, so that for foil transformers the same adjustability of the coupling factor cannot be obtained without further steps being taken.
The invention is based on the recognition of the difference in the build-up of the magnetic stray ficld of the foil winding and that of a wire winding. Due to the distance between the wires of a 10519~5 winding layer which is necessary for insulation, the field lines of the neighbouring magnetic field are curved more on the side of a wire winding than the field lines on the side of a foil winding, because the field lines are parallel to the conductive closed surface of the foils. The field lines of the magnetic field of a foil winding, however, are substantially curved at the end face of the winding.
This device permits the realization of a high-voltage transformer which offers the advantages of a foil winding and which is also tunable in the described manner.
In accordance with this invention there is provided a high-voltage transformer~ notably a line transformer for a television receiver, comprising a ferromagnetic core which consists of two yokes which are interconnected by two legs, at least one low-voltage winding which encloses one of the legs, and one high-voltage winding which is arranged on the low-voltage winding, characterized in that the low-voltage winding is a foil winding, the length of the leg whereabout the low-voltage winding and the high-voltage winding are arranged being substantially larger than the width of the foil winding, said high voltage winding being movable in the direction of the axis of the leg about which it is arranged.
The invention will be described in detail hereinafter with reference to a drawing.
Figure 1 is a diagrammatic view of a preferred embodiment of a high-voltage transformer according to the invention, and Figure 2 is a diagrammatic view of a further embodiment of a high-voltage transformer according to the invention.
In Figure 1, a foil winding 2 is arranged about a core 1. The layers of the winding 2 are insulated from each other by an insulating tape of '' ' '~
l>'~`. 77'l'~
X,1~J.75 1~51985 A syllt}letic nlatcrial~ for exam~le, a~Mylar roil whi.ch is to be WO(IIICI SilllUlt.lllCOllSly Wit}l a conductive foil. The nei~hbol~ing field linos 3 of tlle magnetic f'ield, ge-nerated by the windillg 2 are substantially curved near the head 5 of thc willding 2 (in the area A), extend approxilllately parallel to the winding 2 in the area B, and arQ substantially curved again on the lower erld 9 o~ the winding 2 (in the area C). Because the foil used in the wi.nding 2 forms an uninterrupted conductive surface, the field lines in the central portion B must extend parallel to the winding 2. In the areas ~ and C, the field lines must be substan-tially curved, because the field lines'3 in the in~
sulating layers of the winding 2 (not shown) also 1$ extend parallel to the winding 2. The axial displace-ment of a high-voltage winding 7 along the foil wind-ing 2 would cause hardly any change in the magnetic field enclosed by the high-voltage winding 7 i,f the lo~r voltage winding 2 were to have a width approxi-matiIIg the length of the leg 6. The arrangement shown and the dimensions of the various components of the higll-voltage transformer enable the coupling factor to be adjusted withill reasonable limits. The width h2 of the alurninium foil of the winding 2 is substan-tially smaller than the distance hl between the two yokes 4 and 4~ of the core 1.
When the high-voltagc winding 7 in Fig. 1 e /~
I'll?i /', 'j ~, 10.75 105~985 i5 s:Lid from t~he so(ctor 13 :into l,he sector A, a cliIferent i.nterscctioll of the :field l:inos 3, and hence a differen-t enclosllro Or 1;he magne-tic fiold, is obta:ine(l, with the resu:l.t that the coupling ractor can be adjusted within S ~;iVOll l~ i t s ~
!; F`ig. 2 diagr.~mnatically S}IOWS a second em-I)odilllont o:E` a lino transforlller 20. Abollt a leg 26 there :is arrallged a foil winding, wllich consist,s of two portions 22 and 22', The -I,wo porti.ons 22 and 22' are s:i~nul.taneous-A lo ly wound in a~My~.clr foil, Tlle central portion 28 about tlle leg 26 is free :t`rom condllctive material and merely consists of insulating foil. The two portions 22 and 22' can be connec-ted in series as well as in parallel, The line trans~ormer 20 can be tuned by sliding the high-voltage winding 27 with respect to the low-voltage willdings 22 and 22'. The width of the foil winding is now to be understood to be the sum of the widths h22 and h22t of the low-voltage windings 22 and 22'.
Wllat is applicable to hl and h2 in Fig. 1, is applicable to hl2 and h22 plus h22t in Fi.g. 2.
It was found that ~hen the leg acconmlodating the lo~-voltage and high-voltage windings has a length e.~;:ceedillg the width of` the f`oil winding increased by four millillletre, the coupling factor can already be properly adjusted.
It was also found that the length o the latl,er leg need not be larger than the sum o:t` the ~idths o:l` the foil winding and the high-voltage winding.
-- f.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A high-voltage transformer, notably a line transformer for a television receiver, comprising a ferromagnetic core which consists of two yokes which are interconnected by two legs, at least one low-voltage winding which encloses one of the legs, and one high-voltage winding which is arranged on the low-voltage winding, characterized in that the low-voltage winding is a foil winding, the length of the leg whereabout the low-voltage winding and the high-voltage winding are arranged being substantially larger than the width of the foil winding, said high-voltage winding being movable in the direction of the axis of the leg about which it is arranged.
2. A high-voltage transformer as claimed in Claim 1, characterized in that the length of the latter leg exceeds the width of the foil winding by at least four millimeters.
3. A high-voltage transformer as claimed in Claim 1, characterized in that the length of the latter leg does not exceed the sum of the widths of the foil winding and the high-voltage winding.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7413744A NL7413744A (en) | 1974-10-21 | 1974-10-21 | HIGH VOLTAGE TRANSFORMER WITH FILM WRAPPING. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1051985A true CA1051985A (en) | 1979-04-03 |
Family
ID=19822303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA237,842A Expired CA1051985A (en) | 1974-10-21 | 1975-10-17 | High-voltage transformer comprising a foil winding |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS5165321A (en) |
| AU (1) | AU8584775A (en) |
| BE (1) | BE834681A (en) |
| BR (1) | BR7506843A (en) |
| CA (1) | CA1051985A (en) |
| DE (1) | DE2546383A1 (en) |
| ES (1) | ES441913A1 (en) |
| FR (1) | FR2289038A1 (en) |
| GB (1) | GB1514990A (en) |
| IT (1) | IT1047376B (en) |
| NL (1) | NL7413744A (en) |
| SE (1) | SE403000B (en) |
| ZA (1) | ZA756483B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE466827B (en) * | 1990-08-07 | 1992-04-06 | Asea Brown Boveri | PROCEDURE FOR CONNECTING END ENDS WITH TAPED COILS |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5122217Y2 (en) * | 1971-09-21 | 1976-06-08 |
-
1974
- 1974-10-21 NL NL7413744A patent/NL7413744A/en not_active Application Discontinuation
-
1975
- 1975-10-14 ZA ZA756483A patent/ZA756483B/en unknown
- 1975-10-16 DE DE19752546383 patent/DE2546383A1/en active Pending
- 1975-10-17 IT IT69596/75A patent/IT1047376B/en active
- 1975-10-17 SE SE7511649A patent/SE403000B/en unknown
- 1975-10-17 CA CA237,842A patent/CA1051985A/en not_active Expired
- 1975-10-17 GB GB42695/75A patent/GB1514990A/en not_active Expired
- 1975-10-18 ES ES441913A patent/ES441913A1/en not_active Expired
- 1975-10-20 BE BE161085A patent/BE834681A/en not_active IP Right Cessation
- 1975-10-20 BR BR7506843*A patent/BR7506843A/en unknown
- 1975-10-20 AU AU85847/75A patent/AU8584775A/en not_active Expired
- 1975-10-21 JP JP50126027A patent/JPS5165321A/ja active Pending
- 1975-10-21 FR FR7532122A patent/FR2289038A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| AU8584775A (en) | 1977-04-28 |
| ES441913A1 (en) | 1977-04-01 |
| FR2289038B1 (en) | 1981-06-26 |
| IT1047376B (en) | 1980-09-10 |
| BR7506843A (en) | 1976-08-17 |
| NL7413744A (en) | 1976-04-23 |
| ZA756483B (en) | 1977-05-25 |
| GB1514990A (en) | 1978-06-21 |
| DE2546383A1 (en) | 1976-04-22 |
| FR2289038A1 (en) | 1976-05-21 |
| JPS5165321A (en) | 1976-06-05 |
| BE834681A (en) | 1976-04-20 |
| SE403000B (en) | 1978-07-24 |
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