EP0727794B1 - Transformateur, notamment pour convertisseur d'énergie, et convertisseur d'énergie à résonance doté d'une tel transformateur - Google Patents
Transformateur, notamment pour convertisseur d'énergie, et convertisseur d'énergie à résonance doté d'une tel transformateur Download PDFInfo
- Publication number
- EP0727794B1 EP0727794B1 EP19960200430 EP96200430A EP0727794B1 EP 0727794 B1 EP0727794 B1 EP 0727794B1 EP 19960200430 EP19960200430 EP 19960200430 EP 96200430 A EP96200430 A EP 96200430A EP 0727794 B1 EP0727794 B1 EP 0727794B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transformer
- magnetic circuit
- branches
- air gap
- magnetic
- 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
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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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/38—Auxiliary core members; Auxiliary coils or windings
-
- 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/346—Preventing or reducing leakage fields
-
- 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F2027/348—Preventing eddy currents
Definitions
- the invention relates to a transformer, in particular for an energy converter, comprising a primary winding and a secondary winding established on a magnetic circuit able to channel the flow of primary winding to secondary winding. She extends to a resonant energy converter with a such a transformer.
- the present invention aims to overcome the disadvantages of transformers due to the existence of a magnetic flux leakage, and intends to provide a transformer designed to remove nuisance linked to this magnetic leakage flux.
- Another object of the invention is to provide a resonant energy converter from simplified design compared to converters of current resonance energy.
- the invention aims, first place, a transformer whose magnetic circuit includes at least three branches, called lateral and central (s), connected to each other, to each of their ends, by two crosspieces.
- Such a transformer therefore has the particularity of integrating, by design, a self leak whose flow is channeled into the material of the circuit magnetic, and whose characteristics can be adjusted according to the thickness and section of the air gap.
- the presence of the closed coil avoids radiation to the outside of the flow magnetic leakage and therefore leads to a determination very precise characteristics of the self, and even in the range of high frequencies in conversion of energy, i.e. frequencies higher than 10 kHz.
- Such an invention thus makes it possible to remove the nuisances linked to the existence of the flow of magnetic leak, using it to achieve a controlled self, and leads to supply a component integrating the functions of self and transformer which so far required two separate components.
- this design ensures galvanic isolation and obtain performance of excellent dielectric strength.
- patent DE 36 09617 describes a device in which two air gaps interrupt the magnetic circuit comprising the coils, and the common flow branch is devoid of air gap. This device therefore constitutes a coupled circuit which cannot act as a transformer, and its teaching does not can in no way suggest the object of the invention.
- Patent DE 11 22627 describes, for its part, a magnetic amplifier whose primary windings and secondary are arranged on the same branch of the circuit magnetic, and having an air gap on another branch able to generate a coupling on a third winding.
- the primary and secondary windings are crossed by the same magnetic flux, and the air gap cannot therefore constitute a controlled self such as that of the invention, materialized by the difference in flux between primary and secondary.
- One of the applications of the invention aims thus the realization of energy converters constituted of a transformer connected in series with a choke, and this invention extends to energy converters to resonance incorporating a transformer as described above and at least one capacity connected in series and / or in parallel with the transformer, the air gap of said transformer being adjusted so that the resulting choke either a resonant choke capable of making it possible to obtain a high frequency in energy conversion, i.e. a frequency above 10 kHz between primary circuits and secondary.
- Such a resonant energy converter has the advantage of being made up of a number of components restricted compared to energy converters at current resonance, and has a cost price lower and a simplified design compared to these last.
- transformers represented schematically in Figures 2 to 4 show the particularity of integrating the functions of self and transformer that so far required two separate components. Such transformers are particularly intended for the realization of resonant energy converters, as shown schematically at Figure 1, comprising, in addition to said transformers, a electronic switch assembly I mounted on at least one capacity C, and a rectifier stage plus loads R.
- the air gap and the capacity are adjusted so as to obtain a resonant frequency, that is to say a frequency greater than 10 kHz.
- each of these transformers have a magnetic circuit 1 consisting of two identical elements 2, 3 adapted for be arranged in an inverted position with respect to the other, said elements having transversely the general shape of an E, one of the branches of which has a shorter length than other branches.
- the magnetic circuit 1 thus formed therefore has three parallel branches, one branch central 4 and two side branches 5, 6, connected to each other, towards each of their ends, in pairs sleepers 7, 8.
- One of the branches of this circuit magnetic 1 has an air gap 9 forming a choke controlled leak, the characteristics of which may be adjusted according to the thickness and the section of said air gap.
- elements 2, 3 of the magnetic circuit 1 can be designed so that the air gap 9 is provided, either in line with the central branch 4 (FIG. 2), either to the right of one of the lateral branches, in example 6 (figure 3).
- the transformer also has a primary winding 10 and a secondary winding 11 arranged respectively around the branches without air gap 9 and therefore mounted on a closed magnetic circuit at low magnetic reluctance with respect to an open circuit including an air gap. So according to the variant of embodiment shown in Figure 2, these windings primary 10 and secondary 11 are arranged respectively around the lateral branches 5, 6. On the other hand, according to the alternative embodiment shown in Figures 3 and 4, these primary 10 and secondary 11 windings are arranged respectively around the central branch 4 and one of the side branches 5.
- the transformer has a turn closed exterior 12 arranged around the magnetic circuit 1 and intended to avoid the radiation of the magnetic flux of leak to the outside.
- this outer fiber can be constituted by a housing 12 of a metallic material enclosing the circuit magnetic 1.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
- Dc-Dc Converters (AREA)
Description
- les bobinages primaire et secondaire sont disposés respectivement autour de deux branches distinctes reliées par les traverses de façon à former avec ces dernières un circuit fermé à faible réluctance magnétique par rapport à un circuit ouvert, c'est-à-dire un circuit comprenant un entrefer,
- la troisième branche comporte un entrefer d'épaisseur prédéterminée ajustable entre une valeur minimale donnée et une valeur maximale sensiblement égale à la longueur de ladite branche, apte à canaliser le flux magnétique de fuite du transformateur correspondant à la différence de potentiel magnétique entre les traverses,
- une spire extérieure fermée est disposée autour du circuit magnétique.
- dont les bobinages primaire et secondaire sont disposés sur deux branches distinctes d'un circuit fermé et sont donc traversés par des flux de valeurs différentes,
- comportant une branche à flux commun dotée d'un entrefer constituant une self contrôlée dont les caractéristiques sont déterminées par la différence de valeur entre les flux traversant les deux branches du circuit fermé.
- la figure 1 est un schéma équivalent d'un convertisseur d'énergie conforme à l'invention,
- la figure 2 est une vue schématique frontale d'une première variante de réalisation d'un transformateur conforme à l'invention,
- la figure 3 est une vue schématique frontale d'une deuxième variante de réalisation de ce transformateur,
- et la figure 4 est une vue en perspective schématique d'un transformateur conforme à celui représenté à la figure 3.
Claims (6)
- Transformateur, notamment pour convertisseur d'énergie, comportant un bobinage primaire (10) et un bobinage secondaire (11) établis sur un circuit magnétique (1) apte à canaliser le flux de l'enroulement primaire (10) vers l'enroulement secondaire (11), le circuit magnétique (1) comportant au moins trois branches (4-6), dites latérales et centrale(s), reliées les unes aux autres, vers chacune de leurs extrémités, par deux traverses (7, 8), ledit transformateur étant caractérisé en ce que :les bobinages primaire (10) et secondaire (11) sont disposés respectivement autour de deux branches distinctes (5, 6 ; 4, 5) reliées par les traverses (7, 8) de façon à former avec ces dernières un circuit magnétique fermé à faible réluctance magnétique par rapport à un circuit magnétique ouvert, c'est-à-dire un circuit comprenant un entrefer,au moins une des autres branches (4 ; 6) comporte un entrefer (9) d'épaisseur prédéterminée ajustable entre une valeur minimale donnée et une valeur maximale sensiblement égale à la longueur de ladite branche, apte à canaliser le flux magnétique de fuite du transformateur correspondant à la différence de potentiel magnétique entre les traverses (7, 8),une spire extérieure fermée (12) est disposée autour du circuit magnétique.
- Transformateur selon la revendication 1, caractérisé en ce que la spire extérieure est constituée par un boítier (12) en un matériau métallique renfermant le circuit magnétique (1).
- Transformateur selon l'une des revendications 1 ou 2, caractérisé en ce qu'il comprend trois branches (4-6), la branche du circuit magnétique (1) présentant un entrefer (9) étant la branche centrale (4) dudit circuit magnétique.
- Transformateur selon l'une des revendications 1 ou 2, caractérisé en ce qu'il comprend trois branches (4-6), la branche du circuit magnétique (1) présentant un entrefer (9) étant une des branches latérales (6) dudit circuit magnétique.
- Transformateur selon l'une des revendications précédentes, caractérisé en ce que le circuit magnétique (1) est constitué d'éléments identiques, (2, 3) adaptés pour être disposés en position inversée l'un par rapport à l'autre, lesdits éléments présentant transversalement la forme générale d'un E dont l'une des branches (4 ; 6) présente une longueur inférieure à celle des autres branches (5, 6 ; 4, 5).
- Convertisseur d'énergie à résonance caractérisé en ce qu'il comprend un transformateur conforme à l'une des revendications 1 à 5 et au moins une capacité montée en série et/ou en parallèle avec ledit transformateur, l'entrefer (9) dudit transformateur étant ajusté de façon que la self résultante soit une self de résonance apte à permettre d'obtenir une haute fréquence en conversion d'énergie, c'est-à-dire une fréquence supérieure à 10 kHz entre les circuits primaire (10) et secondaire (11).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9502027A FR2730849B1 (fr) | 1995-02-20 | 1995-02-20 | Transformateur, notamment pour convertisseur d'energie, et convertisseur d'energie a resonnance dote d'un tel transformateur |
FR9502027 | 1995-02-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0727794A1 EP0727794A1 (fr) | 1996-08-21 |
EP0727794B1 true EP0727794B1 (fr) | 1999-09-01 |
Family
ID=9476389
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19960200430 Expired - Lifetime EP0727794B1 (fr) | 1995-02-20 | 1996-02-19 | Transformateur, notamment pour convertisseur d'énergie, et convertisseur d'énergie à résonance doté d'une tel transformateur |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0727794B1 (fr) |
DE (1) | DE69603993T2 (fr) |
FR (1) | FR2730849B1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3566481B2 (ja) * | 1997-02-07 | 2004-09-15 | 株式会社日立製作所 | 渦電流シールド装置および三相変圧器 |
SG183303A1 (en) * | 2010-03-25 | 2012-09-27 | Panasonic Corp | Transformer |
CN111105925B (zh) * | 2018-10-27 | 2021-12-28 | 杨勇 | 基于去磁电感滤波磁路的高压直流输电线感应取能装置及方法 |
CN110634655B (zh) * | 2019-08-14 | 2021-05-14 | 华为技术有限公司 | 磁集成器件、功率变换电路、充电器及电动车辆 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1122627B (de) * | 1959-01-15 | 1962-01-25 | Siemens Ag | Anordnung zur Beeinflussung der Flussverteilung bei Kleintransformatoren, Drosselspulen kleiner Leistung, Messwandlern oder Induktivitaeten in einem mehr als zwei Schenkel aufweisendem Eisenkern in Abhaengigkeit von seiner primaeren Erregung |
DE2036467C3 (de) * | 1970-07-22 | 1975-08-14 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | LC-Siebschaltung für Stromversorgungsgeräte mit Gleichspannungsausgang |
DE3151170A1 (de) * | 1981-12-23 | 1983-06-30 | Siemens AG, 1000 Berlin und 8000 München | Geschirmter, in isolierende vergussmasse eingebetteter transformator fuer ein insbes. bei hoeheren frequenzen betriebenes schaltnetzteil, insbes. sperrwandlernetzteil in einem farbfernsehempfaenger |
DE3609617C2 (de) * | 1986-03-21 | 1994-04-14 | Thomson Brandt Gmbh | Spulenkern |
-
1995
- 1995-02-20 FR FR9502027A patent/FR2730849B1/fr not_active Expired - Fee Related
-
1996
- 1996-02-19 EP EP19960200430 patent/EP0727794B1/fr not_active Expired - Lifetime
- 1996-02-19 DE DE1996603993 patent/DE69603993T2/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
FR2730849B1 (fr) | 1997-05-09 |
EP0727794A1 (fr) | 1996-08-21 |
DE69603993T2 (de) | 2000-05-18 |
FR2730849A1 (fr) | 1996-08-23 |
DE69603993D1 (de) | 1999-10-07 |
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