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EP3267445B1 - Transformateur et appareil d'alimentation en puissance à mode commuté - Google Patents

Transformateur et appareil d'alimentation en puissance à mode commuté Download PDF

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Publication number
EP3267445B1
EP3267445B1 EP16178165.3A EP16178165A EP3267445B1 EP 3267445 B1 EP3267445 B1 EP 3267445B1 EP 16178165 A EP16178165 A EP 16178165A EP 3267445 B1 EP3267445 B1 EP 3267445B1
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EP
European Patent Office
Prior art keywords
winding
primary winding
secondary windings
transformer
windings
Prior art date
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Active
Application number
EP16178165.3A
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German (de)
English (en)
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EP3267445A1 (fr
Inventor
Hiroo Ogawa
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Tamura Corp
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Tamura Corp
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Publication of EP3267445A1 publication Critical patent/EP3267445A1/fr
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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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • 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
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/12—Two-phase, three-phase or polyphase transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps

Definitions

  • the present invention relates to a switched-mode power supply apparatus.
  • the switched-mode power supply apparatus rectifies and smooths a voltage which is supplied by an external power source; performs switching operation due to a semiconductor switching element to input the voltage into a primary winding of the transformer; and supplies DC voltage from a secondary winding to a load through a smoothing operation performed by a smoothing circuit. Furthermore, an output voltage is monitored, and the time ratio of the semiconductor switching element is adjusted by a control circuit so that the output voltage is constantly maintained.
  • a transformer for the above multi-output switched-mode power supply apparatus has a core, a primary winding which is provided in a core, and at least two secondary windings which are also provided in the core.
  • Japanese patent application JP H07 283037 A aims to provide a low noise transformer being employed in various electronic apparatuses.
  • Japanese patent application JP 2000 223324 A aims to provide a converter transformer, in which an output voltage characteristic is improved by low noises and high coupling.
  • cross regulation may occur when the load becomes unbalanced.
  • the current flowing through one of the secondary windings becomes changed, other remaining secondary winding(s) which is not considered to be related to the change of the load is changed, thereby rendering the output voltage unstable.
  • the invention has been made for solving the above problems or drawbacks, and provides a transformer being capable of reducing the cross regulation even in a case where the load is unbalanced and a switched-mode power supply apparatus using the transformer.
  • the transformer in which the cross regulation is reduced even in a case where the load is unbalanced and the switched-mode power supply apparatus using the transformer can be obtained.
  • switched-mode power supply apparatus provided with the transformer will be hereinafter described.
  • the embodiment of the transformer is firstly described and the configuration of the switched-mode power supply apparatus using the transformer is described later.
  • FIG. 1 is a schematic cross-sectional view of an entire configuration of the first embodiment of a transformer in accordance with the invention.
  • a transformer T transforms a voltage which is supplied by an external power source, and provides electric power to a load such as an external device or a circuit connected to the transformer T.
  • the transformer T has a core 10, a winding 11 provided in the core 10, at least two secondary windings 12, 13 (in the embodiment, two secondary windings), and an auxiliary winding 14.
  • the core 10 has a linear center leg portion 10a in the center portion thereof.
  • the center log portion 10a is provided with the windings 11-14 such that the winding axis of the windings 11-14 is arranged on the same line C.
  • a gap 15 is provided in the core 10 at a location where the primary winding 11 is provided. In other words, the gap 15 is provided in the center leg portion 10a.
  • the secondary windings 12, 13, and the auxiliary winding 14 are wound around the center leg portion 10a in a state the polarity thereof is reversed with respect to the polarity of the primary winding 11.
  • the core 10, the windings 11-14 are respectively insulated by a bobbin (not shown) formed of insulating material such as resin.
  • the primary winding 11 is connected to an external power source, and supplies electric power to the secondary windings 12, 13 and the auxiliary winding 14.
  • the secondary windings 12, 13 are connected to the load such as the external device or the external circuit between both terminals, and supply electric power which is supplied by the primary winding 11 to the circuit or the load.
  • the secondary windings 12, 13 are connected to, for example, a buffer circuit for operating IGBT, MOS, and the like.
  • the secondary windings 12, 13 are disposed at both sides of the primary winding 11 in a winding axis of the primary winding 11. In other words, both of the secondary windings 12 and 13 are disposed adjacent to the primary winding 11.
  • the secondary windings 12 and 13 are respectively spaced apart from the primary winding 11 at an equal distance in the winding axis of the primary winding 11.
  • the secondary windings 12, 13 are respectively spaced apart from the gap 15 at an equal distance in the winding axis of the primary winding 11.
  • the secondary windings 12, 13 are respectively spaced apart from the primary winding 11 as well as the gap 15 at an equal distance in the winding axis of the primary winding 11.
  • the secondary windings 12, 13 are symmetrically arranged with respect to the primary winding 11, and are symmetrically arranged with respect to the gap 15.
  • the auxiliary winding 14 is connected to a control circuit for controlling a switching element which is described below.
  • the auxiliary winding 14 receives electric power from the primary winding 11 to provide electric power voltage for driving the control circuit. While the auxiliary winding 14 is disposed next to the secondary winding 13 in the same winding axis as the secondary winding 13, it may be disposed next to the secondary winding 12.
  • FIG. 2 is a circuit diagram of a switched-mode power supply apparatus provided with the first embodiment of the transformer. Since the transformer T is provided with a plurality of the secondary windings 12,13 (in the embodiment, two secondary windings), the switched-mode power supply apparatus provided with the embodiment of the transformer (i.e., the transformer T) corresponds to a multi-output power supply apparatus.
  • the switched-mode power supply apparatus is, for example, a flyback switched-mode power supply apparatus, and used for switching a semiconductor.
  • the switched-mode power supply apparatus has the transformer T, a switching element 21, a control circuit 22 for controlling the switching element 21, diodes 23, 24, and capacitors 25, 26.
  • the switched-mode power supply apparatus may have a rectifying/smoothing circuit.
  • the rectifying/smoothing circuit is connected between the external power source and the primary winding 11 of the transformer T to rectify and smooth the voltage supplied by the external power source.
  • the switching element 21 is a semiconductor switching element such as FET.
  • the switching element 21 is connected to the primary winding 11 of the transformer T to control the input voltage into the primary winding 11.
  • the control circuit 22 is equipped with IC, and connected to the switching element 21 and the auxiliary winding 14 which is provided at the output side.
  • the control circuit 22 receives the power voltage supply from the auxiliary winding 14 to control the time ratio of on/off of the switching element 21 for the purpose of controlling the input voltage into the primary winding 11. In other words, the control circuit 22 performs a control for the purpose of keeping the output voltage of the secondary windings 12 and 13 at a predetermined voltage.
  • control circuit 22 may have voltage monitoring means for detecting the voltage of the auxiliary winding 14, smoothing means such as a capacitor for smoothing the output voltage from the auxiliary winding 14, a photocoupler provided with a light-emitting element and a light-receiving element, and IC.
  • smoothing means such as a capacitor for smoothing the output voltage from the auxiliary winding 14, a photocoupler provided with a light-emitting element and a light-receiving element, and IC.
  • an output voltage value from the auxiliary winding 14 which is smoothed by the smoothing means and detected by the voltage monitor means is firstly input into the IC.
  • the IC calculates the output voltage of the secondary windings 12, 13 based on the (output) voltage value, and the winding number ratio of the auxiliary winding 14 and the secondary windings 12 and 13, and generates the control signal for stabilizing the output voltage of the secondary windings 12, 13 based on the output voltage of the secondary windings 12, 13.
  • the IC outputs the control signal at the light-emitting element of the photocoupler which is connected to the IC.
  • the light-emitting element converts the input control signal into optical signal, and outputs the optical signal at the light-receiving element which is connected to the switching element 21. Furthermore, the light-receiving element converts the input optical signal into electric signal, and changes the time ratio of the switching element 21 based on the electric signal.
  • the capacitors 25, 26 are connected to the secondary windings 12, 13.
  • the diodes 23, 24 are connected between the secondary windings 12, 13 and the capacitors 25, 26 to rectify the output voltage from the secondary windings 12 and 13. Furthermore, the capacitors 25, 26 smooth the rectified voltage and generate DC voltage.
  • the embodiment of the transformer T has the core 10; the primary winding 11 and at least two secondary windings 12, 13 provided in the core 10 around the same winding axis.
  • the gap 15 is provided in the core 10 at the location where the primary winding 11 is provided.
  • the secondary windings 12, 13 are spaced apart from the both sides in the direction of the winding axis C and the gap 15 at an equal distance. Due to the above configuration, the inductance difference as well as the difference of coupling coefficient with respect to the primary winding 11 between the two secondary windings 12, 13 can be reduced, thereby suppressing the difference between the output voltages of the two secondary windings 12, 13 when the output voltages of the two secondary windings 12, 13 are stabilized, as shown in FIG. 3 .
  • the effect of the embodiment is explained in comparison to the conventional technologies.
  • the conventional transformer in which the secondary windings 112, 113 that are disposed at both sides of the primary winding 111 are not spaced apart from the gap 115 at an equal distance, if the inductance values of the secondary windings 112, 113 are two-figure (digit) ⁇ H and the inductance value difference between the secondary windings 112, 113 is single-figure (digit) ⁇ H, the output voltages of the second windings differ from each other, as shown in FIG. 15 . This is because the difference between the inductance values of the secondary windings 112, 113 is great. In an example as shown in FIG.
  • the inductance values are equalized to only the level of two figure (digit).
  • the inductance values of the secondary windings 12 and 13 of the transformer T i.e., the embodiment of the transformer
  • the inductance values of the secondary windings 12 and 13 of the transformer T are equalized to the level of the first decimal place. That is, there is two-figure (digit) difference between the conventional technologies and the embodiment of the transformer in terms of the correspondence of the inductance values.
  • the inductance values are equalized to only the level of single figure (digit). Furthermore, the coupling coefficient values of the secondary windings 112, 113 with respect to the primary winding 111 are equalized to only the level of the first decimal place. On the other hand, the inductance values of the secondary windings 12 and 13 of the transformer T (i.e., the embodiment of the transformer) are equalized to the level of the first decimal place. That is, there is single figure (digit) difference between the conventional technologies and the embodiment of the transformer in terms of the correspondence of the inductance values.
  • the coupling coefficient values with respect to the primary winding 11 are equalized to the level of the second decimal place. That is, there is single figure (digit) difference between the conventional technologies and the transformer T (i.e., the embodiment of the transformer) in terms of the correspondence of the coupling coefficient values.
  • the difference of the coupling coefficient with respect to the primary winding 11 and the inductance difference between the secondary windings 12, 13 can be reduced. Therefore, the transformer being capable of synergistically suppressing the difference between the output voltages from the secondary windings 12, 13 and the switched-mode power supply apparatus using the same transformer can be obtained.
  • the second embodiment is described with reference to FIGS. 4-11 .
  • the configuration of the second embodiment is basically equal to that of the first embodiment. Therefore, only the difference between the second embodiment and the first embodiment will be described.
  • the same part or portion is denoted by the same reference numeral, and detailed description thereof is omitted.
  • FIG. 4 is a schematic cross-sectional view showing an entire configuration of the second embodiment of a transformer.
  • FIG. 5 is a circuit diagram of a switched-mode power supply apparatus provided with the second embodiment of the transformer.
  • the second embodiment is different from the first embodiment in that at least two auxiliary windings 14, 16 (two auxiliary windings in the embodiment) are provided.
  • the second embodiment is different from the first embodiment in that each of the auxiliary windings 14, 16 neighbors respectively each of the secondary windings 12, 13 in the winding axis direction of the windings 11-13, and connected in parallel to each other.
  • Each of the auxiliary winding 14 and 16 is spaced apart from the gap 15 at an equal distance and arranged symmetrically with respect to the gap 15, in the winding axis direction.
  • the auxiliary windings 14 and 16 may not be necessarily arranged symmetrically with respect to the gap 15.
  • the secondary windings 12, 13 are arranged closer to the primary winding 11 than the auxiliary windings 14, 16.
  • Each of the windings 11-16 is insulated by the bobbin that is formed of insulating material such as resin.
  • the auxiliary windings 14, 16 are connected in parallel to the control circuit 22.
  • the second embodiment The action and effect of the embodiment (i.e., the second embodiment) will be explained in comparison to that of the first embodiment.
  • the load is unbalanced (for example, a case where two different loads are respectively connected to the secondary windings 12, 13)
  • variation in the output voltage of the secondary windings 12, 13 can be suppressed.
  • the configuration of the second embodiment can be applied to any transformer which is provided with the primary winding and two or more secondary windings.
  • FIG. 6 shows the waveform of the output voltage of each of the secondary windings 12, 13 in a case where the balance of the load is changed in the configuration of the first embodiment.
  • FIG. 6 is an example of an output voltage waveform (after rectification) in a case where the current of the secondary winding 12 is 0A and the current of the secondary winding 13 is 0.1A.
  • the width between the dotted lines corresponds to the width between the maximum output voltage of the secondary winding 12 and the minimum output voltage of the secondary winding 13. It can be seen that the gap or interval is about 4.25 V.
  • the embodiment of the transformer has the core 10; the primary winding 11 provided in the core 10; at least two secondary windings 12, 13 provided in the core 10 around a winding axis which is the same as a winding axis of the primary winding 11; and at least two auxiliary windings 14, 16 provided in the core 10 around a winding axis which is the same as the winding axis of the primary winding 11.
  • the auxiliary windings 14, 16 respectively neighbor the secondary windings 12, 13, and are connected in parallel to each other. Due to this configuration, even in a case where the load becomes unbalanced, the problem of the cross regulation can be improved. For example, FIG.
  • FIG. 7 shows an output voltage waveform of the secondary windings 12, 13 (after rectification) when the balance of the load is changed.
  • the condition of FIG. 7 is similar to that of FIG. 6 in that the current of the secondary winding 12 is 0A and the current of the secondary winding 13 is 0.1A.
  • the width between the dot-and-dash lines of the maximum output voltage and the minimum output voltage of the secondary windings 12, 13 is about 2.25V, which is less than the width (about 4.25V) between the dotted lines as shown in FIG. 6 and means that variation in the output voltage is less. In other words, it can be seen that the stability of the output voltage is improved, and the cross regulation is improved.
  • FIGS. 8A and 8B show the output voltage waveform of secondary winding before rectification.
  • FIG. 8A shows the output voltage waveform in a case where a current flowing through the secondary winding 12 is 0A (no load) and a current flowing through the secondary winding 13 is 0.1A.
  • FIG. 8A shows the output voltage waveform in a case where a current flowing through the secondary winding 12 is 0A (no load) and a current flowing through the secondary winding 13 is 0.1A.
  • the distortion in the output voltage waveform at the no-load side means corresponding or proportional variation (change) in the output voltage.
  • the distortion is also created in the voltage waveform of the auxiliary winding 14 neighboring the above secondary winding.
  • the voltage waveform of the auxiliary winding 14 as shown in FIG. 9B in a case where the current flowing through the secondary winding 12 that is disposed away from the auxiliary winding 14 is 0.1A and the current flowing through the secondary winding 13 that is disposed adjacent to the auxiliary winding 14 is 0A is different from the voltage waveform of the auxiliary winding 14 as shown in FIG.
  • the two auxiliary windings 14, 16 are provided in the core 10 and connected in parallel to each other. Accordingly, the auxiliary windings 14, 16 is shorted to each other, and the waveforms of the auxiliary windings 14, 16 are equalized.
  • FIG. 10 shows the voltage waveforms of the auxiliary windings 14, 16 in a case where the current of the secondary winding is 0A and the current of the secondary winding 13 is 0.1A. It can be seen that the two voltage waveforms are made same.
  • the magnetic field generated by each of the auxiliary winding 14, 16 respectively exerts its action on each of the secondary windings 13, 12 which neighbors each of the auxiliary windings 14, 16.
  • the voltage waveform of one of the secondary windings 12, 13 is normal and the distortion occurs in the voltage waveform of the other of the secondary windings 12, 13.
  • the voltage waveform of the auxiliary winding 14, 16 neighboring the secondary winding 12, 13 having the distorted voltage waveform also becomes distorted.
  • the voltage waveform of the auxiliary winding 14, 16 which neighbors the secondary winding 12, 13 having the normal voltage waveform is normal, and the two auxiliary windings 14, 16 are shorted to each other.
  • the voltage waveform of the auxiliary winding 14 16 which neighbors the secondary winding 12, 14 having the distorted voltage waveform is normalized.
  • FIG. 11 shows the voltage waveform (before rectification) in a case where the current of the secondary winding 12 is 0A and the current of the secondary winding 13 is 0.1A.
  • the projection (about 20V) in the voltage waveform of the secondary winding 12 ( FIG. 11 ) is further lowered in comparison to the projection (about 21V) in the voltage waveform of the secondary winding 12 as shown in FIG. 8A . Therefore, it can be seen that the distortion is alleviated.
  • the voltage waveforms of the secondary windings 12, 13 (before rectification) are improved such that they are equalized, the cross regulation can be reduced.
  • the secondary windings 12, 13 are arranged at both sides of the primary winding 11 and closer to the primary winding 11 than the auxiliary windings 14, 16, in the winding axis direction. Due to this, the coupling coefficient between each of the secondary windings 12, 13 and the primary winding 11 can be increased, thereby improving the transformation (conversion) efficiency of the transformer.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Claims (4)

  1. Dispositif d'alimentation en énergie en mode commuté, comprenant :
    un transformateur (T), qui comprend :
    un noyau (10) comportant une partie de branche centrale linéaire (10a) dans sa partie centrale ;
    un enroulement primaire (11) agencé autour de la partie de branche centrale linéaire (10a) du noyau (10) ;
    au moins deux enroulements secondaires (12, 13) agencés autour de la partie de branche centrale linéaire (10a) du noyau (10) et présentant un axe d'enroulement qui est identique à un axe d'enroulement de l'enroulement primaire (11), qui sont configurés de manière à être raccordés à une charge et délivrent de l'énergie électrique, qui est délivrée par l'enroulement primaire (11), à la charge ;
    dans lequel au moins deux enroulements auxiliaires (14, 16) sont agencés autour de la partie de branche centrale linéaire (10a) du noyau (10) et présentent un axe d'enroulement qui est identique à l'axe d'enroulement de l'enroulement primaire (11), dans lequel les enroulements auxiliaires (14, 16) sont respectivement adjacents aux enroulements secondaires (12, 13), et sont raccordés parallèlement l'un à l'autre, et ;
    dans lequel les enroulements secondaires (12, 13) sont disposés sur les deux côtés de l'enroulement primaire (11) suivant la direction d'axe d'enroulement de l'enroulement primaire (11) et sont disposés plus près de l'enroulement primaire (11) que les enroulements auxiliaires (14, 16), suivant la direction d'axe d'enroulement de l'enroulement primaire (11) ;
    caractérisé en ce qu'un élément de commutation (21) est raccordé électriquement à l'enroulement primaire (11) du transformateur (T) afin de commander une tension d'entrée, qui est délivrée par une source d'énergie externe dans l'enroulement primaire (11) ; et
    un circuit de commande (22) est configuré de manière à commander l'élément de commutation (21), dans lequel les enroulements auxiliaires (14, 16) du transformateur (T) sont raccordés électriquement au circuit de commande (22) et délivrent au circuit de commande (22) de l'énergie électrique, qui est délivrée par l'enroulement primaire (11), afin de commander l'élément de commutation (21).
  2. Dispositif d'alimentation en énergie en mode commuté selon la revendication 1, dans lequel le transformateur (T) comprend, en outre :
    un espace (15) formé sur le noyau (10) à un emplacement auquel l'enroulement primaire (11) est formé, dans lequel les enroulements secondaires (12, 13) sont espacés par rapport aux deux côtés de l'enroulement primaire (11) à une distance égale suivant la direction d'axe d'enroulement de l'enroulement primaire (11) ; et, en outre, espacés par rapport à l'espace (15) de la partie de branche centrale linéaire (10a) du noyau (10) à une distance égale suivant la direction d'axe d'enroulement de l'enroulement primaire (11).
  3. Dispositif d'alimentation en énergie en mode commuté selon la revendication 1 ou 2, dans lequel les enroulements auxiliaires (14, 16) sont respectivement adjacents aux enroulements secondaires (12, 13) suivant la direction d'axe d'enroulement de l'enroulement primaire (11).
  4. Dispositif d'alimentation en énergie en mode commuté selon l'une quelconque des revendications précédentes, dans lequel les enroulements auxiliaires (14, 16) sont agencés de manière électriquement indépendante des enroulements secondaires (12, 13).
EP16178165.3A 2016-07-06 2016-07-06 Transformateur et appareil d'alimentation en puissance à mode commuté Active EP3267445B1 (fr)

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EP16178165.3A EP3267445B1 (fr) 2016-07-06 2016-07-06 Transformateur et appareil d'alimentation en puissance à mode commuté

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EP16178165.3A EP3267445B1 (fr) 2016-07-06 2016-07-06 Transformateur et appareil d'alimentation en puissance à mode commuté

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EP3267445A1 EP3267445A1 (fr) 2018-01-10
EP3267445B1 true EP3267445B1 (fr) 2020-06-03

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07283037A (ja) * 1994-04-12 1995-10-27 Matsushita Electric Ind Co Ltd トランス
JP2000223324A (ja) * 1999-01-29 2000-08-11 Matsushita Electric Ind Co Ltd コンバータトランスおよびそれを用いた電子機器
JP3543029B2 (ja) * 1995-05-29 2004-07-14 松下電器産業株式会社 コンバータトランス
JP2011134744A (ja) * 2009-12-22 2011-07-07 Takasago Seisakusho:Kk スイッチングトランス及びスイッチング電源

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0216500B1 (fr) * 1985-08-19 1992-06-03 Mitsubishi Denki Kabushiki Kaisha Appareil d'induction électromagnétique
JP2964718B2 (ja) 1991-08-08 1999-10-18 松下電器産業株式会社 スイッチング電源装置
JP3654816B2 (ja) * 1999-08-26 2005-06-02 Ｆｄｋ株式会社 マルチチャンネル・ユニフォーム出力型トランス
EP2551860A4 (fr) * 2010-03-25 2013-01-30 Panasonic Corp Transformateur
CN201859747U (zh) * 2010-07-22 2011-06-08 中国西电电气股份有限公司 带辅助绕组电力变压器的器身排列结构
JP5159984B1 (ja) * 2011-11-29 2013-03-13 三菱電機株式会社 変圧器およびそれを含む変圧装置
EP2639800B1 (fr) * 2012-03-14 2014-10-15 Siemens Aktiengesellschaft Transformateur pour un véhicule entraîné électriquement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07283037A (ja) * 1994-04-12 1995-10-27 Matsushita Electric Ind Co Ltd トランス
JP3543029B2 (ja) * 1995-05-29 2004-07-14 松下電器産業株式会社 コンバータトランス
JP2000223324A (ja) * 1999-01-29 2000-08-11 Matsushita Electric Ind Co Ltd コンバータトランスおよびそれを用いた電子機器
JP2011134744A (ja) * 2009-12-22 2011-07-07 Takasago Seisakusho:Kk スイッチングトランス及びスイッチング電源

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