JP2005045093A - Switching transformer - Google Patents

Switching transformer Download PDF

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Publication number
JP2005045093A
JP2005045093A JP2003278806A JP2003278806A JP2005045093A JP 2005045093 A JP2005045093 A JP 2005045093A JP 2003278806 A JP2003278806 A JP 2003278806A JP 2003278806 A JP2003278806 A JP 2003278806A JP 2005045093 A JP2005045093 A JP 2005045093A
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JP
Japan
Prior art keywords
transformer
case
main body
side core
core
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Pending
Application number
JP2003278806A
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Japanese (ja)
Inventor
Osamu Watanabe
修 渡辺
Hideto Saeki
英人 佐伯
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Tamura Corp
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Tamura Corp
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Application filed by Tamura Corp filed Critical Tamura Corp
Priority to JP2003278806A priority Critical patent/JP2005045093A/en
Priority to KR1020040057509A priority patent/KR100658856B1/en
Priority to CNB2004100586391A priority patent/CN100435246C/en
Publication of JP2005045093A publication Critical patent/JP2005045093A/en
Pending legal-status Critical Current

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    • 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
    • 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
    • H01F27/02—Casings
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H01F27/325—Coil bobbins

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switching transformer capable of reducing the number of parts and the number of assembly processes, and of being made small in size and low in its height. <P>SOLUTION: There are provided a transformer body 1, 1A where a coil 4 is wound on a coil bobbin 2 and a pin terminal 8 is implanted, a case side core 9, 9A, 9B where a transformer body storing part 13, 13A for storing the transformer body 1, 1A is formed, and an upper side core 14, 14A mounted on an upper part of the case side core 9, 9A, 9B for covering an upper part of the transformer body 1, 1A. A sealed case and a storage case disposed outside the transformer body are omitted, and the cores are instead used as the sealed case and the storage case. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は民生用の電子機器に用いられるスイッチングトランスに関する。   The present invention relates to a switching transformer used in consumer electronic equipment.

近年、各種機器は省スペース化が要求され、それに伴い小型化、低背化等の傾向にあり、今後益々その傾向は強い。   In recent years, various devices have been required to save space, and accordingly, there has been a trend toward miniaturization, low profile, and the like.

低背型志向の機器、例えばＤＶＤホームシアター、液晶ＴＶ、ＰＤＰ、モバイルパソコン用ＳＷＡＤ、などが今後需要の主流となると考えられる。それに伴いスイッチング電源も当然低背を求められる。スイッチング電源を低背化しようとするとどうしてもスイッチングトランスがネックとなる。   Low-profile devices such as DVD home theater, liquid crystal TV, PDP, mobile personal computer SWAD, etc. are expected to become the mainstream of demand in the future. Accordingly, the switching power supply is naturally required to have a low profile. When trying to reduce the height of a switching power supply, the switching transformer inevitably becomes a bottleneck.

スイッチングトランスは種々のタイプのものが存在するが、低背型タイプとしては本願出願人によって先に図５に示す低背型スイッチングトランスが提案されている。   There are various types of switching transformers. As the low profile type, the present applicant has previously proposed the low profile switching transformer shown in FIG.

この低背型スイッチングトランスは、コイル２０とピン端子２１が植設されたコイルボビン２２と一対の磁気コア２３とを備えたトランス本体２４と、このトランス本体２４を覆う収納ケース２５と、この収納ケース２５の内面に設けられ、前記トランス本体２４を覆う導体からなるシールドケース２６と、トランス本体２４が設けられた前記収納ケース２５に注入された樹脂２６とから構成されている。
特願２００３−４０５４５ The low-profile switching transformer includes a transformer body 24 including a coil bobbin 22 in which a coil 20 and a pin terminal 21 are planted, and a pair of magnetic cores 23, a storage case 25 covering the transformer body 24, and the storage case A shield case 26 made of a conductor covering the transformer body 24 and a resin 26 injected into the storage case 25 in which the transformer body 24 is provided.
Japanese Patent Application No. 2003-40545

スイッチングトランスは音響機器の電源用として用いた場合、この電源からは可聴範囲の周波数を含むノイズが発生し、発生したノイズは音響機器に影響を与える。   When the switching transformer is used as a power source for an acoustic device, noise including frequencies in the audible range is generated from the power source, and the generated noise affects the acoustic device.

このノイズはトランスから多く発生するため、トランスからのノイズを防ぐためにシールドケース２６、収納ケース２５等を設けた構成としており、大容量のトランスの場合、上記スイッチングトランスは優れている。   Since much noise is generated from the transformer, the shield case 26, the storage case 25, and the like are provided to prevent noise from the transformer. In the case of a large capacity transformer, the switching transformer is excellent.

しかし、小容量で良い場合、シールドケース２６、収納ケース２５等は必ずしも必要ではない。また、シールドケース２６、収納ケース２５がなければそれだけ小型化、低背化を図ることができる。   However, when a small capacity is sufficient, the shield case 26, the storage case 25, etc. are not necessarily required. Further, if the shield case 26 and the storage case 25 are not provided, the size and the height can be reduced accordingly.

本発明はこのことに鑑み提案されたもので、その目的とするところは、部品点数および組立工数等を削減し、かつ小型化、低背化等を図ったスイッチングトランスを提供することにある。   The present invention has been proposed in view of this, and an object of the present invention is to provide a switching transformer in which the number of parts, the number of assembly steps, and the like are reduced, and the size and the height are reduced.

請求項１記載の発明によれば、コイルボビン２にコイル４が巻装され、かつピン端子８が植設されたトランス本体１、１Ａと、このトランス本体１、１Ａを収納するトランス本体収納部１３、１３Ａが形成されたケース側コア９、９Ａ、９Ｂと、このケース側コア９、９Ａ、９Ｂの上部に取付けられ、前記トランス本体収納部１３、１３Ａに収められたトランス本体１、１Ａの上部を覆う上側コア１４、１４Ａとを備えた構成とし、上記目的を達成している。   According to the first aspect of the present invention, the transformer main body 1, 1 </ b> A in which the coil 4 is wound around the coil bobbin 2 and the pin terminal 8 is implanted, and the transformer main body storage portion 13 for storing the transformer main body 1, 1 </ b> A. , 13A formed on the case side cores 9, 9A, 9B, and the upper parts of the transformer main bodies 1, 1A mounted on the case side cores 9, 9A, 9B and housed in the transformer main body storage parts 13, 13A. The upper cores 14 and 14A covering the above are provided, and the above object is achieved.

請求項２記載の発明によれば、上記請求項１記載のものにおいて、前記コイルボビン２のフランジ５、５Aの両端部に端子台７、７Ａが形成され、この端子台７、７Ａに前記ピン端子８、８Ａが植設され、前記上側コア１４、１４Ａは前記端子台７、７Ａ間を覆い、前記端子台７、７Ａの上面およびピン端子８、８Ａは外部に露出させた構成としている。   According to the second aspect of the present invention, the terminal block 7, 7A is formed at both ends of the flange 5, 5A of the coil bobbin 2, and the pin terminal is connected to the terminal block 7, 7A. 8 and 8A are implanted, the upper cores 14 and 14A cover the terminal blocks 7 and 7A, and the upper surfaces of the terminal blocks 7 and 7A and the pin terminals 8 and 8A are exposed to the outside.

また、請求項１または２記載において、前記トランス本体１、１Ａが収納された前記トランス本体収納部１３、１３Ａに樹脂を充填する構成としている。   Moreover, in Claim 1 or 2, it is set as the structure which fills with resin the said transformer main body accommodating parts 13 and 13A in which the said transformer main bodies 1 and 1A were accommodated.

請求項１記載の発明によれば、開口部を有するケース側のコア９、９Ａ、９Ｂと、その開口部側に被せられる蓋としての機能も有する上側コア１４、１４Ａとの中にトランス本体１、１Ａを収納し、トランス本体１、１Ａをコアによって覆うようにしたため、シールド部材や収納ケースが不要となり、その分、材料費を削減し得、かつ組立も容易に行うことができ、小型化、低背化を図ることができる。   According to the first aspect of the present invention, the transformer main body 1 is contained in the case-side cores 9, 9A, 9B having an opening and the upper cores 14, 14A that also function as a lid that covers the opening. 1A is housed and the transformer body 1 and 1A are covered with a core, so that a shield member and a housing case are no longer required, material costs can be reduced, and assembly can be easily performed, resulting in miniaturization. It is possible to reduce the height.

請求項２記載の発明によれば、絶縁性の樹脂からなる端子台７、７Ａに植設されたピン端子８、８Ａを介し取付面に容易に実装することができる。   According to invention of Claim 2, it can mount in an attachment surface easily via the pin terminals 8 and 8A planted by the terminal blocks 7 and 7A which consist of insulating resin.

請求項３記載の発明によれば、トランス本体１、１Ａの絶縁を確実に行うことができる。   According to the third aspect of the invention, it is possible to reliably insulate the transformer main bodies 1 and 1A.

この発明は、トランス本体を収納するシールドケースおよび収納ケースを省き、コアをシールドケース、収納ケースとして用いたことに特徴を有している。   The present invention is characterized in that the shield case and the storage case for storing the transformer main body are omitted, and the core is used as the shield case and the storage case.

以下、本発明の実施の形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は本発明の一実施例の分解斜視図、図２は組立斜視図を示す。   FIG. 1 is an exploded perspective view of an embodiment of the present invention, and FIG. 2 is an assembled perspective view.

図中１はトランス本体で、このトランス本体１は、必要に応じ適形状に成形された絶縁性の樹脂からなるコイルボビン２と、このコイルボビン２の巻胴部３の外周に巻装されたコイル４とを備えて構成されている。   In the figure, reference numeral 1 denotes a transformer body. The transformer body 1 includes a coil bobbin 2 made of an insulating resin formed into an appropriate shape as necessary, and a coil 4 wound around the outer periphery of a winding body 3 of the coil bobbin 2. And is configured.

コイルボビン２の巻胴部３の両端にそれぞれ外形が例えばほぼ弧状をなす上側フランジ５、下側フランジ６が形成され、上側フランジ５の両端部には肉厚の端子台７がそれぞれ一体形成され、この端子台７の上面には適間隔でもって複数本のピン端子８が植設されている。また、巻胴部３の外周に巻装されたコイル４の引出線（図示せず）は、周知のように、コイルボビン２に形成された引出溝（図示せず）を介し所定のピン端子の根元に絡げ付けられ、半田付け接続され、これによってトランス本体１が構成される。   Upper and lower flanges 5 and 6 having outer shapes, for example, substantially arc-shaped, are formed at both ends of the winding body 3 of the coil bobbin 2, and thick terminal blocks 7 are integrally formed at both ends of the upper flange 5, A plurality of pin terminals 8 are implanted on the upper surface of the terminal block 7 with appropriate intervals. As is well known, the lead wire (not shown) of the coil 4 wound around the outer periphery of the winding drum section 3 is connected to a predetermined pin terminal via a lead groove (not shown) formed in the coil bobbin 2. The transformer body 1 is configured by being entangled with the base and soldered.

９はフェライトの成形品からなるケース側コアで、トランス本体１が載置される底板１０の中央部には中足１１が形成され、かつ底板１０の周囲には図示の状態において上方に立上がった周壁１２が形成され、中足１１と周壁１２との間の空間部分がトランス本体収納部１３となっている。   Reference numeral 9 denotes a case-side core made of a ferrite molded product. A middle leg 11 is formed at the center of the bottom plate 10 on which the transformer body 1 is placed, and rises upward around the bottom plate 10 in the illustrated state. A peripheral wall 12 is formed, and a space portion between the middle foot 11 and the peripheral wall 12 is a transformer main body storage portion 13.

この例では、中足１１はコイルボビン２の巻胴部３の中空部分と対応して円柱状に形成されている。また、トランス本体収納部１３はコイルボビン２の上下のフランジ５、６および端子台７を内部に収納し得るようそれらの外形とほぼ対応した形状に形成されている。   In this example, the middle foot 11 is formed in a columnar shape corresponding to the hollow portion of the winding body portion 3 of the coil bobbin 2. Further, the transformer main body storage portion 13 is formed in a shape substantially corresponding to the outer shape thereof so that the upper and lower flanges 5 and 6 and the terminal block 7 of the coil bobbin 2 can be stored therein.

１４は上側コアで、ケース側コア９と同様の材質からなり、かつケース側コア９の開口部の上方に設けられる。   Reference numeral 14 denotes an upper core made of the same material as the case side core 9 and provided above the opening of the case side core 9.

この上側コア１４は例えば矩形の板状に形成され、ケース側コア９内に収納されたトランス本体１の各端子台７の間であって上側フランジ５の上部を覆うように設けられる。この場合、上側フランジ５が被せられ、当接されるケース側コア９の周壁１４に、これと対応する上側フランジ１４の下部との間に接着剤（図示せず）が塗布され、上側コア１４とケース側コア９とが一体化される。   The upper core 14 is formed in a rectangular plate shape, for example, and is provided between the terminal blocks 7 of the transformer body 1 housed in the case side core 9 so as to cover the upper portion of the upper flange 5. In this case, an adhesive (not shown) is applied to the peripheral wall 14 of the case-side core 9 that is covered with and contacts the upper flange 5 between the upper flange 14 and the corresponding lower portion of the upper flange 14. And the case-side core 9 are integrated.

トランス本体１のコイル４および上下のフランジ５、６は、ケース側コア９および上側コア１４によって覆われ、ケース側コア９および上側コア１４はシールドケース兼収納ケースとして機能する。   The coil 4 and the upper and lower flanges 5 and 6 of the transformer main body 1 are covered with a case side core 9 and an upper core 14, and the case side core 9 and the upper core 14 function as a shield case and a storage case.

組立てにあたっては、ケース側コア９のトランス本体収納部１３内に、別途予め組立てられたトランス本体１を収納し、かつエポキシ樹脂の如き樹脂を充填する。樹脂を充填、硬化後、上側コア１４を接着剤を介してケース側コア９の周壁１２の上部に取り付ければ、僅かな組立工数でもって容易にスイッチングトランスを組立てることができる。なお、中足１１と被せられた上側コア１４との間には周知のように適間隔の磁気ギャップが設けられる。また、端子台７、７Ａの上面は、取付面への実装を考慮し上側コア１４の上面より突出している。   In assembling, the transformer main body 1 separately assembled in the transformer main body accommodating portion 13 of the case side core 9 is accommodated and filled with a resin such as an epoxy resin. If the upper core 14 is attached to the upper part of the peripheral wall 12 of the case-side core 9 via an adhesive after filling and curing the resin, the switching transformer can be easily assembled with a small number of assembly steps. As is well known, an appropriately spaced magnetic gap is provided between the middle leg 11 and the upper core 14 covered. The upper surfaces of the terminal blocks 7 and 7A protrude from the upper surface of the upper core 14 in consideration of mounting on the mounting surface.

上述の説明において、ケース側コア９にトランス本体１を収納後に樹脂を充填する場合について説明したが、トランス本体収納後に上側コア１４を被せ、内部に樹脂を真空充填するようにしても良い。この場合、空気の混入を防ぎ、トランス本体１を確実に絶縁することができる。   In the above description, the case where the case body core 9 is filled with the resin after the transformer body 1 is housed has been described. However, after the transformer body is housed, the upper core 14 may be covered and the inside filled with the resin by vacuum. In this case, mixing of air can be prevented and the transformer body 1 can be reliably insulated.

また、コイル４の電線として三層電線を用い、樹脂充填を省略しても良い。   Further, a three-layer electric wire may be used as the electric wire of the coil 4 and the resin filling may be omitted.

また、規格によってはコイル４の電線を通常の電線とし、樹脂の充填を省略しても良い。   Further, depending on the standard, the electric wire of the coil 4 may be a normal electric wire, and the resin filling may be omitted.

さらに、トランス本体１やケース側コア９、上側コア１４の形状は上述の図１および図２の図示例に限らず、例えば図３に示すように、トランス本体１Ａを平面から見てほぼ長円形とし、そのトランス本体１Ａを収納可能なトランス本体収納部１３Ａを有するケース側コア９Ａにトランス本体１Ａを収納し、トランス本体１Ａの端子台７Ａの上面を露出させる切欠き１４ａが形成された板状の上側コア１４Ａを被せた構成としても良い。   Furthermore, the shapes of the transformer main body 1, the case side core 9, and the upper core 14 are not limited to the examples shown in FIGS. 1 and 2 described above. For example, as shown in FIG. The transformer body 1A is housed in a case-side core 9A having a transformer body housing portion 13A capable of housing the transformer body 1A, and a plate shape is formed with a notch 14a that exposes the upper surface of the terminal block 7A of the transformer body 1A. The upper core 14A may be covered.

また、図４に示すように、ケース側コア９Ｂの外形およびトランス本体収納部１３Ｂを長円形としたり、その他必要に応じた適形状に形成し、それらに組み込まれるトランス本体や上側ケースもそれに対応した形状としても良い。   Moreover, as shown in FIG. 4, the outer shape of the case side core 9B and the transformer main body storage portion 13B are formed into an oval shape, or other appropriate shapes as required, and the transformer main body and the upper case incorporated therein are also compatible with it. It is good also as the shape made.

この発明は、ＤＶＤホームシアター、液晶ＴＶ、ＰＤＰ、モバイルパソコン用ＳＷＡＤ等に利用可能である。   The present invention can be used for DVD home theaters, liquid crystal TVs, PDPs, mobile personal computer SWADs, and the like.

本発明の実施例１の分解斜視図を示す。The disassembled perspective view of Example 1 of this invention is shown. 同実施例１の組立斜視図である。FIG. 2 is an assembled perspective view of the first embodiment. 本発明の他の実施例の分解斜視図である。It is a disassembled perspective view of the other Example of this invention. 本発明のさらに他の実施例のケース側コアの斜視図である。It is a perspective view of the case side core of the further another Example of this invention. 先行技術の断面図を示す。1 shows a cross-sectional view of the prior art.

符号の説明Explanation of symbols

１、１Ａ・・・トランス本体
２・・・コイルボビン
３・・・巻胴部
４・・・コイル
５、５Ａ・・・上側フランジ
６・・・下側フランジ
７、７Ａ・・・端子台
８・・・ピン端子
９、９Ａ、９Ｂ・・・ケース側コア
１０・・・底板
１１・・・中足
１２・・・周壁
１３、１３Ａ、１３Ｂ・・・トランス本体収納部
１４、１４Ａ・・・上側コア
DESCRIPTION OF SYMBOLS 1, 1A ... Transformer body 2 ... Coil bobbin 3 ... Winding drum part 4 ... Coil 5, 5A ... Upper flange 6 ... Lower flange 7, 7A ... Terminal block 8 .... Pin terminals 9, 9A, 9B ... Case side core 10 ... Bottom plate 11 ... Middle leg 12 ... Peripheral walls 13, 13A, 13B ... Transformer main body storage parts 14, 14A ... Upper side core

Claims (3)

コイルボビン（２）にコイル（４）が巻装され、かつピン端子（８）が植設されたトランス本体（１、１Ａ）と、このトランス本体（１、１Ａ）を収納するトランス本体収納部（１３、１３Ａ）が形成されたケース側コア（９、９Ａ、９Ｂ）と、このケース側コア（９、９Ａ、９Ｂ）の上部に取付けられ、前記トランス本体収納部（１３、１３Ａ）に収められたトランス本体（１、１Ａ）の上部を覆う上側コア（１４、１４Ａ）とを備えてなることを特徴とするスイッチングトランス。 A transformer main body (1, 1A) in which a coil (4) is wound around a coil bobbin (2) and a pin terminal (8) is implanted, and a transformer main body storage portion (1) for storing the transformer main body (1, 1A) 13 and 13A) are formed on the case side core (9, 9A, 9B) and the upper part of the case side core (9, 9A, 9B) and stored in the transformer main body storage portion (13, 13A). A switching transformer comprising an upper core (14, 14A) covering an upper portion of the transformer body (1, 1A). 請求項１記載において、前記コイルボビン（２）のフランジ（５、５A）の両端部に端子台（７、７Ａ）が形成され、この端子台（７、７Ａ）に前記ピン端子（８、８Ａ）が植設され、前記上側コア（１４、１４Ａ）は前記端子台（７、７Ａ）間を覆い、前記端子台（７、７Ａ）の上面およびピン端子（８、８Ａ）は外部に露出していることを特徴とするスイッチングトランス。 The terminal block (7, 7A) is formed at both ends of the flange (5, 5A) of the coil bobbin (2) according to claim 1, and the pin terminal (8, 8A) is formed on the terminal block (7, 7A). The upper core (14, 14A) covers the space between the terminal blocks (7, 7A), and the upper surface of the terminal block (7, 7A) and the pin terminals (8, 8A) are exposed to the outside. A switching transformer characterized by that. 請求項１または２記載において、前記トランス本体（１、１Ａ）が収納された前記トランス本体収納部（１３、１３Ａ）に樹脂が充填されることを特徴とするスイッチングトランス。 3. The switching transformer according to claim 1, wherein the transformer main body storage portion (13, 13A) in which the transformer main body (1, 1A) is stored is filled with resin.
JP2003278806A 2003-07-24 2003-07-24 Switching transformer Pending JP2005045093A (en)

Priority Applications (3)

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JP2003278806A JP2005045093A (en) 2003-07-24 2003-07-24 Switching transformer
KR1020040057509A KR100658856B1 (en) 2003-07-24 2004-07-23 Switching transformer
CNB2004100586391A CN100435246C (en) 2003-07-24 2004-07-26 Switch transformer

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JP2003278806A JP2005045093A (en) 2003-07-24 2003-07-24 Switching transformer

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KR102143867B1 (en) * 2019-06-07 2020-08-12 (주) 트랜스온 SLIM TRANSFORMER FOR PFC(Power Factor Correction)
KR20220028764A (en) * 2020-08-31 2022-03-08 이강복 Coil of hybrid structure core to prevent gap loss

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CN102339666A (en) * 2010-07-16 2012-02-01 株式会社田村制作所 Inducer
CN102074338A (en) * 2010-12-14 2011-05-25 东莞京洲灯饰有限公司 Transformer for lamp
KR101661322B1 (en) * 2014-11-14 2016-10-04 주식회사 솔루엠 Coil component and electronic device having the same
CN105679493A (en) * 2016-05-02 2016-06-15 杨宏 Magnetic apparatus adopting novel structure
KR102080651B1 (en) * 2018-05-28 2020-02-24 삼성전기주식회사 Coil component

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JP3204243B2 (en) * 1999-03-12 2001-09-04 株式会社村田製作所 Surface mount type coil parts

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Publication number Priority date Publication date Assignee Title
KR102143867B1 (en) * 2019-06-07 2020-08-12 (주) 트랜스온 SLIM TRANSFORMER FOR PFC(Power Factor Correction)
KR20220028764A (en) * 2020-08-31 2022-03-08 이강복 Coil of hybrid structure core to prevent gap loss
KR102458188B1 (en) * 2020-08-31 2022-10-24 이강복 Coil of hybrid structure core to prevent gap loss

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KR100658856B1 (en) 2006-12-15
CN100435246C (en) 2008-11-19
CN1577653A (en) 2005-02-09
KR20050012173A (en) 2005-01-31

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