Α7 Β7 ft 436823 五、發明説明（3 抟術頜Μ 本發明係有關適用於電子機器或電源装置使用之變壓 (請先閲讀背面之注意事項再填寫本頁) 器（Transformer)或抗流線圈（Choke coil)上之線圈構造 體，尤其是關於當做變壓器使用時，其磁束耦合情況良好 * · 而且損失低，.且高頻特性良好之裝置者。_ 坊銜昔暑 !變壓器係使用於電子機器或電源装置上之磁性構件， 使初级線圈（primary)及次鈒線圈（secondary)間加Μ絕緣 處理，，同時具有次級方線圈之電壓係収決於初級側電壓及 線圈捲數比（Winding ratio)之性能者。 按交換電源（Power switching)用之變壓器，，以導線 捲製於線軸（Bob bin)所構成之捲線式變壓器者已經普及，。 尤其是對其中之作為磁芯之尺寸則已由JIS或IEC等之規格^ ，達成標準化，。. 經濟部中央標準局K工消費合作社印製 但不使用線軸之變壓器，_如：日本專利公報「特開昭 63-173308號j所揭示，.茌單一多層（Multi -layer)印刷電 路基板上配設線圈組之印刷線圈式變壓器已為眾所周知 若依上述構成，·由於各線組（c 〇 i η間之配置極為鄰近/故 可減低由漏電感（Leakage inductance)所產生之損失。但 經本發明人之詳细檢討，.發現起因於漏電感以外之其他損 失量也相當之大故尚有再度謀求低損失化之必要性存在 又，·已知在日本公開之特許平1-503264號公報中揭露 之印刷線圈式變壓器；係將起因於開關電流之初級電路與 3 (修正頁） 本紙張尺度適用中國國家標準（CNS > A4規格（2丨0X297公釐） 4 3 68 2 3 Λ7Α7 Β7 ft 436823 V. Description of the invention (3 Mandibular jaw M This invention relates to transformers suitable for use in electronic equipment or power supply devices (please read the precautions on the back before filling this page) Transformer or anti-current coil The coil structure on (Choke coil), especially when it is used as a transformer, it has a good coupling of the magnetic beam * * and a device with low loss and good high-frequency characteristics. The magnetic components on the machine or power supply unit add M insulation between the primary and secondary coils, and the voltage of the secondary side coil depends on the primary side voltage and the coil winding ratio ( Winding ratio). According to transformers used for power switching, coiled transformers made of wire wound on bobbin have become popular, especially for the size of the core. It has been standardized by the standards of JIS or IEC ^, etc .. Transformers printed by the K-Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs but not using spools, such as: Japan According to the Japanese Gazette "Japanese Patent Application Laid-Open No. 63-173308, it is well known that printed coil transformers having a coil set on a multi-layer printed circuit board are well-known. 〇i η configuration is very close / so it can reduce the loss caused by leakage inductance (Leakage inductance). But after a detailed review by the inventor, it is found that the loss caused by leakage other than leakage inductance is also quite large. There is a need to reduce the loss again. The printed coil transformer disclosed in Japanese Patent Laid-Open Publication No. Hei 1-503264 is known; it is a primary circuit caused by switching current and 3 (revised page) Paper size applies to Chinese national standard (CNS > A4 size (2 丨 0X297mm) 4 3 68 2 3 Λ7
A I B7 ' 五、發明説明（4 ) 次鈒電路間之寄生電流（parasitic current),_予以最小 化處理，.以達成低損失化目樑但經本發明人再加Μ檢討 結果判明^僅考慮多曆印刷電路基板之積層順序.，其低損 失化效果並不充分i。 故，.本發明為解決上述課題，.以提供具有變壓器俱失 最小之鐵芯形狀之小型印刷線圈式變壓器為目的β 貉明丨夕搵示 為達成上述目的之本發明係在複數個同心漩渦型線圈_ ,利用絕緣樹脂於厚度方向堆積成線圈積層體之該漩渦中 心，.配置ΕΕ型拗芯或Ε I型鐵芯之中間腳鐵芯33 Μ獲得該 複數個線圈間之磁束耦合之平面型變壓器中^使該變壓器 鐵芯之斷面積，，在腳部鐵芯3 4與連结部鐵芯3 5之斷面横略 為一致，·且使該中間腳鐵芯之斷面横iU ,,約為變歷器腳部 斷面稹之2倍。.而與鐵芯體積V e之關係上，_能滿足下式 1.4S Ve1/3/Ae1/2S 1.7,， 且該鐵芯之中間腳鐵芯與腳部鐵芯之間隔w ,與該中間腳 鐵芯之高度h之關係掂滿足 0 . 5忘h / w盔2之條件為特徴者， 經濟部中央標準局貝工消費合作社印掣 H· 1^1 II - - - ml > J、 -本 1—1 l^i I- u----- ΙΓ^· (請先閱讀背面之注意事項再填寫本頁) 〇 依本發明之構成，.由於沿磁路將锁芯斷面積作成均等 狀π以確保一定之磁束密度：其損失因而不會有局部性之 增大情況。*又，.雖Μ鐵芯之中間腳鏹芯與腳部糨芯形成之 空間部圃著線圈斷面，但可藉由娥芯形狀之最適化來使線 % 圈電阻最小化，.因此，I有肋於變颳器之小型化e 圃而^榴盟銳明 本纸張尺度適用中國國家標準（CNS ) A4規格（2丨OX297公釐) Λ f τ -白-, 1 436823 1 436823 經濟部中央標準局員工消費合作社印製 A7 B7 五、發明説明（5 ) 圖1表示本發明實胞例之組裝狀態之構成斜視圖，其 α 中有一部分剖視^ 圖2為線圈積層體40之斷面圖^ 画3為鐵芯3 0之形狀詳細說明圖|。 圖4為說明變壓器損失Ploss與鐵芯斷面積/U關係之概 念圖。. 圖5表示本發明之第二實施例之構成圖。 « 圖6說明ϋ ϋ型鐵芯形狀之構成圖_。 圖7為圖8及圖9之實胞例之比較基準，·鐵芯腳間空間 部之尺寸比（h/w)為1時之構成圖β 圖8表示本發明之第三：實施例構成斜視圖。 * 圖9表示本發明之第四’實施例之構成斜視圖。 * 圖10表示本發明之第五實施例之構成斜視圖& 圖11為ΕΕ型鐵芯形狀之說明画 圖12表示本發明之第六實施例之構成斜視圖。 * 為甯倫太發职^晷佳形雜 如下，，參照圖面說明本發明。，圃1係表示本發明之一 實施例之組裝狀態之構成斜視画.。，其線圏積層體之一部為 剖視圖圖中之線圈積層體40,,係將Κ往之線軸和導線加 以一體化者。.線圈積層體40之中央部形成有鐵芯孔41，.可 將上部鐵S 31及下部鐵芯32之中間腳鐵芯插入。.端子42係 被埋入於，、與組裝線圈積層體4 0之上部鐵芯3 1及下部鐵芯 32之腳部鐵芯34—邊直交之另兩邊內，。 圖2為線圈積層體40之剖面圔，.表示圖1,.2-2方向之 本紙張尺度逋用中國國家標準（CNS > A4規格（210 X 2.97公釐） ς (請先閱讀背面之注意事項再填寫本頁)AI B7 'V. Description of the invention (4) Parasitic current between secondary circuits (_) should be minimized to achieve a low loss of eyepieces, but it is determined by the inventor's review results that ^ only consider more The stacking order of printed circuit boards is not sufficient to reduce the loss. Therefore, in order to solve the above-mentioned problem, the present invention aims to provide a small printed coil transformer having an iron core shape with minimal transformer loss. Β β 明 丨 eve 搵 The present invention achieving the above-mentioned purpose is based on a plurality of concentric swirls Type coil_, the center of the vortex of the coil laminated body is stacked with an insulating resin in the thickness direction, and an intermediate leg iron core 33 Μ equipped with an Ε-type core or an EI-type core is used to obtain a plane of magnetic beam coupling between the plurality of coils In the transformer, the cross-sectional area of the core of the transformer is approximately the same as the cross-section of the leg core 34 and the connecting part core 35, and the cross-section of the middle leg core iU, It is about 2 times the cross section of the foot of the calendar. In terms of the relationship with the core volume V e, _ can satisfy the following formula 1.4S Ve1 / 3 / Ae1 / 2S 1.7, and the interval w between the middle leg core and the leg core of the core, and the middle The relationship between the height h of the leg iron core 掂 satisfies the condition of 0.5 forgotten h / w helmet 2 is the special person. The central government bureau of the Ministry of Economic Affairs of the Bayer Consumer Cooperative Press H · 1 ^ 1 II---ml > J 、 -本 1-1— l ^ i I- u ----- ΙΓ ^ · (Please read the precautions on the back before filling in this page) 〇 According to the structure of the present invention, the cross section of the lock core is made along the magnetic circuit. Equal π to ensure a certain magnetic beam density: its loss will not increase locally. * Also, although the space section formed by the middle leg core and the leg core of the M iron core has a coil cross section, the coil winding resistance can be minimized by optimizing the E core shape. Therefore, I It is ribbed in the miniaturization of the scraper. The paper size is applicable to the Chinese National Standard (CNS) A4 (2 丨 OX297 mm) Λ f τ -White-, 1 436823 1 436823 Economy Printed by A7 B7 of the Consumer Standards Cooperative of the Ministry of Standards of the People's Republic of China 5. Description of the invention (5) Figure 1 shows a perspective view of the assembly state of the real cell example of the present invention. Sectional drawing ^ Drawing 3 is a detailed illustration of the shape of the iron core 30. | Figure 4 is a conceptual diagram illustrating the relationship between the transformer loss Ploss and the core cross-sectional area / U. Fig. 5 shows a configuration diagram of a second embodiment of the present invention. «Figure 6 illustrates the structure of a ϋ ϋ-shaped iron core. Fig. 7 is a comparison standard of the real cell examples of Figs. 8 and 9, when the size ratio (h / w) of the space between the iron core legs is 1 Fig. 8 Fig. 8 shows the third aspect of the present invention: the structure of the embodiment Oblique view. * Fig. 9 is a perspective view showing a constitution of a fourth 'embodiment of the present invention. * Fig. 10 is a perspective view showing the structure of a fifth embodiment of the present invention & Fig. 11 is an explanatory drawing showing the shape of an EE type iron core. Fig. 12 is a perspective view showing the structure of a sixth embodiment of the present invention. * For Ning Lun Tai Fang ^ 晷 good shape miscellaneous As follows, the present invention will be described with reference to the drawings. The garden 1 is a squint drawing showing the assembled state of one embodiment of the present invention. One of the wire stacks is the coil stack 40 in the cross-sectional view, which integrates the bobbin and the wire toward K. A core hole 41 is formed in the central portion of the coil laminated body 40, and an intermediate leg core of the upper iron S 31 and the lower iron core 32 can be inserted. The terminal 42 is buried in the other two sides which are orthogonal to the leg cores 34 of the upper core 31 and the lower core 32 of the assembled coil laminate 40. Figure 2 is a cross-section of the coil laminate 40, which represents the paper size in the direction of Figure 1, .2-2, using the Chinese National Standard (CNS > A4 size (210 X 2.97 mm)) (Please read the back (Please fill in this page again)
4368 2 3 A7 __B7_ ' 五、發明説明（6 ) 斷面。，於圖中可看到有兩層次鈒線圏4 5設於中層部位，而 將其上下各一曆以初鈒線圈4 4挟持著。，鄰近鐵芯孔41之位 置上，.設有連結上下各一層初級線圈44之內部連結端子 43a,.及連结全初级線圈44及次級線圈45之内部連結端子 43b。.又，t線圈積曆體40之兩側設有端子42,、其中之一係 連結上下各一層之初鈒線圈44之初級端端子42a,,另一方 為連結兩層次級線圈45之次級端端子42b。，而線圈捲數係、: 初级線圈44之每層為3圈、，次级線圈45則每層為2圈/線圈 各層間Μ絕緣樹脂充填，t其間隔距離係依各種安全規格認 可之必要值0 . 6 in m，，相當薄。因而可造成更小型化之變壓 器。 經濟部中央標準局員工消費合作社印製 圖3係鐵芯3 0之形狀詳细說明圖，，（A)為上部鐵芯3 1和 下部鐵芯3 2之組成狀態正面圖，.（B )係鐵S平面圖N ( C )係 說明鐵芯斷面積之斜視圖中間腳鐵芯3 3之直徑以D表示 之。t直徑D值與腳部鐵芯34之橫寬值C相等（D = C),。連結部 鐵；S 3 5之長度為/\、，腳部鐵芯3 4之內側側間隔為E、腳部鐵 芯3 4之厚度為b。.又，.腳部鐵芯之內側側面與中間腳鐵芯 33之對向面間之間隔為w。.故可成立下面之關係式： A = E + 2b= (D + 2w)+2b . (1) 而且，.上部鐵芯3 i和下部鐵芯3 2組裝狀態下之連結部 35之高度為Η、，而連結部35所爵向之内面間隔為h,.連結部 鐵芯35之厚度為t時，v下面之關係式成立； H=h+2t * (2) 設定連結部鐵芯3 5之斷面積為A e 3 5、,腳部鐵芯3 4之斷 6 (請先鬩讀背面之注意事項再填寫本頁} 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 4 3 6823 A7 B7 經濟部中央標準局員工消費合作社印製 五、發明説明 ( 7 ) | 面 積 為 A e 34以及 中 間 腳 Afh 鐵 33 磁 束 方 向 之 斷 面 積 為 A e 33 » 1 .1 則 可 設 定 對 通過 連 結 部 鐵 芯 35 腳 部 鐵 34 中 間 腳 AMs 鐵 芯 33 之 每 條 磁 力線 所 相 當 之 鐵 4·-»· 心 斷 面 積 約 為 相 等 值 鰣 故 % 可 产~S. 請 1 防 止 磁 束 密 度因 局 部 提 高 而 造 成 之 損 失 之 增 大 在 此· i 有 閱 f _ t 兩 條 磁 力 線 通過 之 中 間 腳 鐵 芯 33 之 撕 面 積 Ae 33 > # 故 該 斷 面 m 背 面 1 1 之 積 Ae 33為 其 他鐵 芯 之 斷 面 積 A e 35 Ae 34之 兩 倍 若 將 鐵 心 注 意 1 I 斷 面 積 A e 定 義為 中 間 腳 Alh, 鐵 芯 之 斷 面 積 A e 3 3 b 則 有 下 列 之 關 事 項 再 1 1 係 產 生 » * 寫 本 ί 1 A e ί™ 2 A e35 (=c 費 t) >—〆 1 a-- 2 A e34 ( =C • b) i 1 = A e 33 ( =η 4 D 2/4) (3) ] 1 此 處 之 厚 度 t , , b 可 滿 足 下 pn_i 關 係 • 0 訂 t = =b 7t ' D/8 (4) I 又 >x A朴 口 tr [ 建 結 部 A+ti 鐵 芯 35 之 體 積 Ve >35 腳 部 鐵 芯 34 之 1 1 I 體 積 Ve 34及 中間 腳 鐵 芯 33之 磁 束 方 向 之 體 積 Ve 33M 表 示 該 1 Af.h 鐵 芯 之 體 胆 積 Ve , * 則 ，1 成 立 下 式 f .> Ί Ve = 2 V e35 + 2V e 3 4 + Ve 33 1 1 2CAt+2Cbh+ η h • D 2/ 4 1 = Ae (A + 2h) = A e ( 2 w + D + 2b + 2h ) 1 I — A e {2 (h + Vi )+ (1 + η /4) D} • :5) 1 1 I 在 此 將 鐵芯 體 積 Ve與 鐵 芯 斷 面 積 Α· 3之 比 率 * * Μ 由 下 式 1 所 定 之 無 次 元化 係 數 k表示之： * 1 1 1 1 本紙張尺度適用中國國家標準（CNS ) A4規格（21〇X297公釐） 7 A7 4368 2 3 ___B7 五、發明説明（8 ) k= Ve1/3/Ae1/2 =(κ /4) - 1/6(2 (h + w)/D+(1+π /4) }1/3 (6) 其次說明，.線圈之鐵損PFe和銅損PCu之關係。此處所 諝之鐵損，，係指因時變磁化力磁鐵芯上消耗之電力：有所 謂磁滯損（Hysteresis loss)和渦流損（Eddy current loss)者。，鐵損Pfe可Μ由下式表示；. PFe=ClVeB2*fsw (7) 上式中之Cl係由線圈彤狀及材料因素而決定之一常數 、B為磁束密度（Flux density)、，fsv則為交換頻率（4368 2 3 A7 __B7_ 'V. Description of the invention (6) Section. As can be seen in the figure, there are two levels of 鈒 lines 5 4 5 located at the middle level, and the upper and lower calendars are held by the beginning 鈒 coils 4 4. In the position adjacent to the core hole 41, there are internal connection terminals 43a connecting the primary coils 44 above and below, and internal connection terminals 43b connecting the primary coils 44 and the secondary coils 45. Also, terminals 42 are provided on both sides of the t-coil calendar 40, one of which is a primary terminal 42a connecting the primary coil 44 of the upper and lower layers, and the other is a secondary connecting the two-level coil 45 Terminalterminal 42b. The number of coils is: 3 turns for each layer of the primary coil 44, 2 turns for each layer of the secondary coil 45 / filling M insulation resin between each layer of the coil, and the separation distance is necessary for approval according to various safety standards The value is 0.6 in m, which is quite thin. This can result in a more compact transformer. Printed on the detailed description of the shape of the iron core 30 by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs, (A) is a front view of the composition state of the upper iron core 31 and the lower iron core 32, (B) The plan view N (C) of the iron S is an oblique view illustrating the cross-sectional area of the iron core. The diameter of the middle leg iron core 33 is denoted by D. The value of t diameter D is equal to the width C of the leg core 34 (D = C). The connecting part is iron; the length of S 3 5 is / \, the interval on the inner side of the leg iron core 34 is E, and the thickness of the foot iron core 34 is b. The interval between the inner side surface of the leg core and the facing surface of the middle leg core 33 is w. Therefore, the following relationship can be established: A = E + 2b = (D + 2w) + 2b. (1) Moreover, the height of the connecting portion 35 in the assembled state of the upper core 3 i and the lower core 32 is Η, and the interval between the inner surfaces of the connecting portion 35 is h. When the thickness of the connecting portion core 35 is t, the following relational formula of v holds: H = h + 2t * (2) Set the connecting portion core 3 The cross-sectional area of 5 is A e 3 5, and the foot iron core 3 of 4 4 (Please read the precautions on the back before filling out this page} This paper size applies to the Chinese National Standard (CNS) A4 size (210X297 mm) ) 4 3 6823 A7 B7 Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs. 5. Description of the invention (7) Set the iron equivalent to each magnetic field line passing through the connecting core 35, the leg 34, the middle leg AMs, and the core 33. The heart-breaking area is approximately the same. Therefore,% can be produced ~ S. Please prevent magnetic flux Loss of density due to local increase The increase in loss is here. I have the tear area Ae 33 of the middle leg iron core 33 through which two magnetic lines pass f_t. Therefore, the product Ae 33 of the back surface 1 1 of this cross section m is the cross sectional area of the other iron cores. A e 35 Ae 34 is twice as long. If the core section 1 I cross section area A e is defined as the middle leg Alh, and the core cross section area A e 3 3 b, then the following related matters will be generated again. A e ί ™ 2 A e35 (= c fee t) > —〆1 a-- 2 A e34 (= C • b) i 1 = A e 33 (= η 4 D 2/4) (3)] 1 The thicknesses t,, b here can satisfy the following pn_i relationship. • Order t = = b 7t 'D / 8 (4) I and> x A 朴 口 tr [Built-up part A + ti Iron core 35 volume Ve > 1 1 I volume Ve 34 of leg iron core 34 and volume 33 in the direction of the magnetic beam Ve 33M of intermediate leg iron core 33 indicate the body cholestasis Ve of the 1 Af.h iron core, * then 1 holds the following formula f. ≫ Ί Ve = 2 V e35 + 2V e 3 4 + Ve 33 1 1 2CAt + 2Cbh + η h • D 2/4 1 = Ae (A + 2h) = A e (2 w + D + 2b + 2h) 1 I — A e {2 (h + Vi) + (1 + η / 4) D} •: 5) 1 1 I The ratio * * Μ is expressed by the non-dimensionalization coefficient k determined by the following formula 1: * 1 1 1 1 This paper size is applicable to the Chinese National Standard (CNS) A4 specification (21〇X297 mm) 7 A7 4368 2 3 ___B7 V. Description of the invention (8) k = Ve1 / 3 / Ae1 / 2 = (κ / 4)-1/6 (2 (h + w) / D + (1 + π / 4)} 1/3 (6) Next, The relationship between the iron loss PFe and the copper loss PCu of the coil. The iron loss here refers to the power consumed by the magnet core due to the time-varying magnetization force: some are called hysteresis loss and eddy current loss. The iron loss Pfe can be expressed by the following formula; PFe = ClVeB2 * fsw (7) The Cl in the above formula is a constant determined by the coil shape and material factors, B is the Flux density, and fsv Is the exchange frequency (
Switching frequency)。若磁束密度B及交換頻率fsw固定. ,則鐵損PFe將與體積Ve成比例，。 銅損係指負載損失，t如線圏之渦電流、.因負載之12 ΪΪ 損失、.漏電之漂遊損失、*由並聯線圈中之循環電流等所產 生之諸損失，稱之。銅損PCuK下式表示； * *Switching frequency). If the magnetic flux density B and the exchange frequency fsw are fixed, then the iron loss PFe will be proportional to the volume Ve. The copper loss refers to the load loss, such as the eddy current of the wire coil, the 12 ohm loss due to the load, the drift loss due to leakage, and * the losses caused by the circulating current in the parallel coil, etc., which are called. The copper loss PCuK is expressed by the following formula; * *
Pcu = C2N2/wh (8) 此處之C2為常數、.N為線圈捲數。.而磁束密度B及捲數 N之間，.也成立如下式之關係。 B=C3/(NAe. fsw) (9) 此處之C3為常數。.若將（9)式代入（δ)式之捲數N,則 得下式；、 PCu = C2{C3/ (B · Ae * fsw) }2/wh ={C 2 * C 3/ ( B ♦ fsw) }2/ (Ae2w * h) =C4/(Ae2* w* h)t (10) 由上式可知，*銅損PCu與鐵芯斷面積2次方成反比例·。 (請先閲讀背面之注意事項再填寫本頁) 訂 經濟部中央標準局員工消費合作社印製 本紙張又度適用中國國家標準（CMS ) A4規格（2i〇X297公釐） 8 436823 A7 B7 經濟部中央標準局員工消費合作社印製 五、發明説明（9 ) 圖4係說明變壓器損失Ploss及鐵芯斷面積Ae關係之概 念圖。.變壓器之損失Ploss由線圈之鐵損PFe及銅損PCu之 「和」而定義。，如（7 )式表示鐵損P F e有隨鐵芯斷面積之 增大而同時增加之傾向。，但銅損P C u則有隨鐵芯斷面積之 增大，> 而減少之傾向。.因此，、以兩者之「和」表規之變壓 器損失P 1 〇 s s ,必定有使損失達成最小化之鐵芯斷面積A e « 之合適值存在 所以，.參照圖3如何決定使變壓器損失P 1 〇 s s為最小之 鐵芯形狀，.將是一大問題。.若設定有關銅損P C u之鐵芯形 狀W h為定數，_則鐵損P F e由（5 )式、使h = >?時，.得其損失值 為最小。，若鐵芯腳間空間E為已知，，鐵芯之線圏通過斷面 寬幅w，由（1)式推算成； t w=(E-D)/2 (11) 再Mh = v,.代入（10)式，則銅損值可由下式表示。 t PCu = C4/ [Ae2 t (E-D)/2}2] =C5/{(E-D)2D4}% (12) 要使變壓器損失為最小時，則使（1 2 )式為最小值即可。但 « * 要使（12)式之值為最小值化之條件為 D = 4 w (13) « 若鐵芯横寛A之值為已知，、則線圈通過斷面寬幅.可由（1 )及（4 )式推算成如下式。、 w= { A- (1 + π /4) D } /2, (14) 而h = w,.代人（10)式，.銅損PCu可由下式表示. (請先閱讀背面之注意事項再填寫本頁)Pcu = C2N2 / wh (8) where C2 is constant and .N is the number of coils. The relationship between the magnetic flux density B and the number of rolls N also holds the following formula. B = C3 / (NAe. Fsw) (9) where C3 is a constant. . If the formula (9) is substituted into the volume number N of the formula (δ), the following formula is obtained; PCu = C2 {C3 / (B · Ae * fsw)} 2 / wh = {C 2 * C 3 / (B ♦ fsw)} 2 / (Ae2w * h) = C4 / (Ae2 * w * h) t (10) As can be seen from the above formula, * The copper loss PCu is inversely proportional to the square power of the iron core cross-sectional area ·. (Please read the notes on the back before filling out this page) Order the paper printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs and apply the Chinese National Standard (CMS) A4 specification (2x0297 mm) 8 436823 A7 B7 Ministry of Economic Affairs Printed by the Consumer Standards Cooperative of the Central Bureau of Standards V. Description of Invention (9) Figure 4 is a conceptual diagram illustrating the relationship between transformer loss Ploss and iron core cross-sectional area Ae. Transformer loss Ploss is defined by the "sum" of the coil's iron loss PFe and copper loss PCu. For example, the formula (7) shows that the iron loss P F e tends to increase at the same time as the core cross-sectional area increases. However, the copper loss P C u tends to decrease as the cross-sectional area of the core increases, > Therefore, the transformer loss P 10 ss with the "sum" gauge of the two must have a proper value of the core cross-sectional area A e «that minimizes the loss. Refer to Figure 3 for how to determine the transformer loss P 1 0ss is the smallest core shape, which will be a big problem. If the core shape W h of the copper loss P C u is set to be a fixed number, then the iron loss P F e is given by Equation (5) and h = >?, The loss value is the smallest. If the space E between the core legs is known, the line 圏 of the core is calculated from the formula (1) through the width w of the section; tw = (ED) / 2 (11) and Mh = v ,. Substitute (10), the copper loss can be expressed by the following formula. t PCu = C4 / [Ae2 t (E-D) / 2} 2] = C5 / {(E-D) 2D4}% (12) To minimize the transformer loss, the formula (1 2) can be minimized. But «* The condition for minimizing the value of (12) is D = 4 w (13)« If the value of the core cross section A is known, then the coil passes through a wide section. By (1 ) And (4) are calculated as follows. , W = {A- (1 + π / 4) D} / 2, (14) and h = w ,. Substitute (10). Copper loss PCu can be expressed by the following formula. (Please read the note on the back first (Fill in this page again)
本紙張尺度適用中國國家標準（CNS ) A4规格（210X297公釐） 9 4 3 68 2 3 A7 B7 五、發明説明（10 ) PCu=C4/[Ae2. {A-(1+π /4)D}2/4] = C5/ [{A- (1+ /ϊ /4) D}2D4] (15) 故，.欲使變壓器之錮損為最小，.使（1 5 )式最小即可e但若 (1 5 )式之值為最小值，，則須成立如下條件^。 (l+τϊ /4)D=4w (16) 再依上述考慮鐵芯内側面間隔E及鐵芯橫寬A之範圍， 變壓器損失最小化之鐵芯形狀，將由（1 3 )式及（1 6 )式，得 * _ 其範圍如下； 1 ^ 2 (h + w) /D^ (l+τϊ /4) . (17) 此時，由（6)式得係數k之範圍如下； 1.5^ 1.6 _ (18) 圖5係表示本發明之第二ί實施例之構成斜視画，圖中 (Α)係將UU型鐵芯裝設於線圈積層體上之狀態。（Β)係線圈 積層體之單獨狀況型鐵芯具有連結部37及其設於兩端 之二腳部36。，雙孔塱線圈積曆體50，備有兩個鐵芯孔51a « 、5 1 b。，雙孔型線圈積曆體5 0，·可裝組U U型鐵芯或ϋ I型鐵 % 芯以構成「閉磁路j 。 經濟部中央標準局員工消費合作社印裂 圖6為說明ϋ U型鐵芯形狀之構成圖。.（A )為U U型鐵芯裝 組狀況後之正面圖、.（B )型U型鐵芯之平面圖_。為說明上之 方便，圖6使用與圖3栢同之符號，但圖6具有其獨特之數 * # 值。_設腳部鐵芯3 6之直徑為D γ連結部鐵芯3 7之長度為A、 厚度t、.橫寬為C、，鐵芯内側面之間隔為2 w。則_鐵芯體積 V e及鐵芯斷面積A e之關係如下式。 10 (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 436823 A7 B7 五、發明説明（11)This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) 9 4 3 68 2 3 A7 B7 V. Description of the invention (10) PCu = C4 / [Ae2. {A- (1 + π / 4) D } 2/4] = C5 / [{A- (1+ / ϊ / 4) D} 2D4] (15) Therefore, if you want to minimize the damage to the transformer, you can minimize the formula (1 5). However, if the value of (1 5) is the minimum value, the following conditions must be met ^. (l + τϊ / 4) D = 4w (16) Considering the range of the core inner side interval E and the width A of the core in accordance with the above, the shape of the core to minimize the transformer loss will be given by (1 3) and (1 6), the range of * _ is as follows; 1 ^ 2 (h + w) / D ^ (l + τϊ / 4). (17) At this time, the range of the coefficient k obtained by formula (6) is as follows; 1.5 ^ 1.6 _ (18) FIG. 5 is a perspective view showing a structure of a second embodiment of the present invention, and (A) is a state in which a UU core is mounted on a coil laminate. The (B) series coil single-body type core has a connecting portion 37 and two leg portions 36 provided at both ends thereof. The double-hole coil coil calendar 50 is provided with two core holes 51a «, 5 1 b. The double-hole coil integrated calendar body 50 can be equipped with UU-type iron cores or ϋI-type iron% cores to form a "closed magnetic circuit j." Structure diagram of iron core shape. (A) is a front view of the UU-type iron core after assembly, and (B) is a plan view of the U-type iron core. For the convenience of explanation, Figure 6 is used with Figure 3 The same symbol, but Figure 6 has its unique number * # value. _ Let the diameter of the leg iron core 36 be D γ The length of the connecting iron core 37 is A, the thickness t, the horizontal width is C ,, The interval between the inner side of the core is 2 w. Then _ the relationship between the core volume V e and the core cross-sectional area A e is as follows: 10 (Please read the precautions on the back before filling this page) This paper size applies to Chinese national standards (CNS) A4 specification (210X297 mm) 436823 A7 B7 V. Description of the invention (11)
Ve=Ae(2(h+w).2D} (19) he = η . D2/4 (20) 因而，係數k如下； k= ( ττ /4) - 1/6 {2 (h+ w)/D + 2) 1/3 (2 1) 則要將變壓器損失p 1 〇 s s為最小時之鐵芯形狀如何參 照圖6予Μ決定成為問題。> 若設定有關於銅損P C U之鐵芯形 狀wh為常數鐵損PFe由（19)式取h = w時為最小值者。若鐵 芯内部橫寬E為已知，則線圈通過之斷面寬幅由圖MB) 有如下式；. w= (E-D)/2 (22 ) 設W = h ,代入（1 0 )式^則飼損P C u之值將與上述（1 2 )式相同 。故代表（12)式之最小值化之各數值、.也可使上述（13)式 之變壓器損失P 1 〇 s s為最小值化/ D = 4 w [13] 若鐵芯橫寬值A為已知，，線圈通過之斷面寬幅V，.可由 圖6 ( B )之關係獲得下式, w=(A-2D)/2 (23) 經濟部中央標準局員工消費合作社印製 (請先閲讀背面之注意事項再填寫本頁) 設h = ,代人（1 0 )式，.則銅損P C u可由下式表示。 PCu=C4/ [Ae2 (A-2D)2/4] =C5/[(A-2D)2D4]. (24) 若須變壓器損失為最小，.則可使（2 4 )式為最小值。若（2 4 ) * 式為最小值，需有下列條件之成立。 2D = 4w、 (25) 要在上述鐵芯內側面横寬E及鐵芯橫寬A之範圍內使變 本紙張尺度適用中國國家標準（CNS ) A4規格（2Ι0Χ2ϋΐΥ Π 436823 A7 B7 五、發明説明（12 ) 壓器損失為最小值時之鐵芯形狀，.可由（13)式及（25)式獲 得其適當範園如下； 1 各 2(h + w)/D銮 2 (26) 此時之係數k,.可由（6)式得其範圍如： 1 . 5 ^ k ^ 1.7 (27 ) 設為滿足h、.w = —常數之條件下 '考慮h关w時之狀況 。圖7係作為對圖δ及圖9之實胞例之基準者。，鐵芯空間部 之尺寸比（h/w)為1時之構成圖。.（Α)係ΕΕ型鐵芯裝組於線 圈積層體狀態時之平面圖。.（B)為（A)之B-B斷面圖，實質 , 上係表示圖1之裝置組裝後之狀態。.如（11)式之所述.，鐵 損PPe在h = w時為最小值。. 圖8像表示本發明之第三實胞例之構成圖，係鐵芯空 * 間部之尺寸比（h/w)為1/2時之構成_、，（A)為EE型鐵芯組 裝於線圈積層體狀況之平面圔、.（B)為（A)在其B-B斷面部 所示之斷面圖。.其尺寸比（h / w )為1 / 2使變壓器損失為最小 之係數k,可依前述（11)〜（18)式之方式推算其範圍如； 1.4^ kg 1.5. (28 ) 經濟部中央標準局員工消費合作社印製 I. HI I- - - - - - - - fn - - J : n (請先閱讀背面之注意事項再填寫本頁) 鐵損PFe若與h/w = l時比較將增加約5%,但Μ變壓器 在其實用上，.可認為係可容許範圍之數值_。 另一方面，，此種鐵芯内側面空間之尺寸形成扁平狀者 ,可導使線圈積層體40之斷面扁平化、.更可使使用導體之 扁平化。有關於飼損之交流驵抗，、係因表皮效應（S k i η effect)導體之表面積愈大，，其損失愈低減之特性'銅損 失減少，《因之，·變壓器之實質損失之增大部分可能少能5 本紙張尺度適用中國國家標準（CNS ) Α4規格（2丨0 X 297公釐） 12 A7 B7 436823 五、發明説明（13) %之數值。 彆 圖9係表示本發明之第四實施例之構成圖〜鐵芯内之 (請先閱讀背面之注意事項再填寫本頁) 空間尺寸比（h / w )為2時之構成圖，.（A )為裝組E E型鐵芯於 線圈積層體狀態之平面圖、，（B)儀（A)之B-B方向之斷面画 。在h / w = 2狀況下^變壓器損失為最小值時之係數k，.可由 前述之（11)〜（18)式同樣方式推算，•則k值範圍為： * l.SSk 运 1,7, (29) 鐵損PFe較h/w = l時約大5% ,，但可認為變壓器在其實 用上，並無太大影響。唯因鐵芯内空間之縱長化·，可使線 « ' 經濟.邓中央標隼局員工消費合作杜印製 圏積層體40之斷面積縱長化，.結果線圏積層體40之平面尺 寸變小，，變壓器在基板之實際組裝面積節省。.如，.由圖9 及圖7作比較，.當變壓器之實際裝組面積改成為縱長型時 ，僅需要其等倍時之1/2。故於被要求高密度組裝之領域. ，可因變壓器之組裝需要面積小為優點而適用於該用途.。 如上述實施例1〜4之說明，.在鐵Η内空間部之尺寸比 .(h/w)為1/2〜2之範圍内，.使變壓器之損失為最小值時之 鐵芯形狀，.可依（18)、.（27)、·（28)以及（29)式之說明，•其 係數k在如下範圍內可實現。 1.4^ 1.7(1/2^ h/tfg 2) (30) Μ下，Μ使用JIS FEER2.5之習用型變壓器與相當於實胞 ψ 例1之本發明品作比較說明。表1為習知型變壓器與本發明 品（係數k = 1 . 6 1 )之特性比較表.，其中上6項係有’關鐵芯形 狀者。.下2項係有關變壓器損失者。、 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 13 1 4 3 68 2 3 A7 B7 五、發明説明（1 4 ) <表一 > 經濟部中央標準局員工消費合作社印製 J IS FEER25 . 5 實胞例（k = 1 . 6 1 ) h [mm] 25.5 23.2 m Η [ m m ] 18.6 12.8 芯 h [ m id ] 3.4 6.2 型 v [ ra ni ] 6.2 4 . 0 狀 V e m m 3 2 160 1782 A e m m 2 44.8 58.1 損 m 損 1 0 , 6 00 A e ' 2 失 鐵 損 1 0 . 8 2 00 V e (請先閲讀背面之注意事項再填寫本頁) *?τί Λ. 對習知塱變壓器而說，本發明品之EE型鐵芯之高度Η « 較低，.而長度Α亦短小約1 0 % 枚鐵芯體積V e將縮小約2 0 %，鐵芯斷面積A e則反而增大約3 0 %。鐵芯體積V e之縮小 ^ * * ,表示磁性材料使用量之減少，、因而在製造上，.可獲得輕 14 本紙張尺度逍用中國國家標準（CNS ) Α4規格（210Χ297公釐） A7 B7 436823 五、發明説明（15) 量且較廉價之製品。I:對鐵芯內空間部之尺寸比來說，；習知 型變壓器之h/w与1/2，略為扁平。t但本發明品則h/whl,5 (請先聞讀背面之注意事項再填寫本買) ，成為縱長彤狀。唯變壓器損失中之銅損減少40%、.鐵損 * 則減少18%, ^從變壓器之特性上說，，極明顯地顯示本發明 之變壓器之性能較為良好， 圖10係表示本發明之第五實施例構成圖。_ (A)儀將EE 型鐵芯裝組於線圈積層體之吠況。.（B)係單獨表示該線圏 積層體者。圖11係說明EE型鐵芯形狀之構成圖，其中（A) * 产 係E E型鐵芯裝組狀態之正面圖。（B )為E E型鐵芯之平面画 。此實施例五係圖3實施例之變形例，在圖3之實施例時/ 其中間腳鐵芯3 3之直徑D及連結部鐵芯3 5之横寬C相等，，但 此圖中設計成D<C。如此構成，可使腳部鐵芯之厚度b更 ， * 薄。而且可設成較大之鐵芯内空間部之尺寸h、j之值，.因 此，，鐵芯內空間部面積hv,可K增大。、结果顯示對變壓器 之小型化、_薄型化有效果。1 圖12係表示本發明之第6實施例之構成斜視圖，（A)為 * EI型鐵芯裝組於線圈積層體之狀態。（B)係線圈積層單體 * 經濟部中央標準局員工消費合作社印製 、（C )係裝組E I型鐵芯狀態之說明圖。> 實例6係圖3之實 施例之變形例，.例中之鐵芯3 0 K E I型鐵芯代替E E型鐵芯者_ 。此種變化，.可K因在實質上具有之鐵S內空間部形狀h. 、w之相同，•可獲得與實施例1同樣之效果。 如Μ上所說明s依本發明，.使鐵芯內空間部之尺寸比 (h / w )在0 , 5到2之範圍内時，，表示鐵芯形狀之係數k (= V e 1 / 3 / A e 1 / 2 )為設定在1 . 4到1 , 7之間，，因此，對鐵損及銅 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） j 4 3 6 8 2 3 A7 B7 ' 五、發明説明（l6 ) 損而定型之變壓器損失之最小值化有效果而且，.與習知 之JIS FEER25.5等規定之變壓器比較，，在變壓器形狀上有 小型化之效果。. 此時之線圈積層體有，·單孔型40及雙孔型50兩種，故 組裝之鐵芯依需要可選定E E型或U U型鐵芯从配合_其對應 於鐵芯形狀之鐵芯内空間部之尺寸比（h / w )及係數k 可由 (30)式推算而得。 * (請先聞讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS ) A4规格（2!0X297公釐）Ve = Ae (2 (h + w) .2D} (19) he = η. D2 / 4 (20) Therefore, the coefficient k is as follows; k = (ττ / 4)-1/6 {2 (h + w) / D + 2) 1/3 (2 1) Then, how to determine the shape of the core when the transformer loss p 1 0ss is the smallest is a problem to refer to FIG. 6. > If the core shape wh of the copper loss P C U is set to be a constant iron loss PFe, the minimum value is obtained when h = w in formula (19). If the internal width E of the iron core is known, the width of the cross-section of the coil is given by the figure MB). W = (ED) / 2 (22) Let W = h and substitute (1 0). Then the value of the feeding loss PC u will be the same as the above formula (1 2). Therefore, the values representing the minimum value of the formula (12) can also minimize the transformer loss P 1 〇ss of the above formula (13) / D = 4 w [13] If the core width A is It is known that the wide width V of the cross section of the coil can be obtained from the relationship of Fig. 6 (B), w = (A-2D) / 2 (23) Printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs (please Read the precautions on the back before filling this page.) Set h =, substitute (1 0), then the copper loss PC u can be expressed by the following formula. PCu = C4 / [Ae2 (A-2D) 2/4] = C5 / [(A-2D) 2D4]. (24) If the transformer loss is to be minimized, then the formula (2 4) can be minimized. If (2 4) * is the minimum value, the following conditions must be met. 2D = 4w, (25) To make the paper size of the modified paper applicable to the Chinese National Standard (CNS) A4 specification (2Ι0χ2ϋΐΥ Π 436823 A7 B7) within the range of the lateral width E and the lateral width A of the core as described above V. Description of the invention (12) The shape of the iron core when the pressure loss is at its minimum value can be obtained from equations (13) and (25) as follows: 1 2 (h + w) / D 銮 2 (26) at this time The coefficient k ,. can be obtained from the formula (6) and its range is as follows: 1.5 ^ k ^ 1.7 (27) Set to meet the conditions of h, .w = —constant conditions' when considering h off w. Figure 7 series As a reference for the real cell example in Figure δ and Figure 9. The configuration diagram when the size ratio (h / w) of the iron core space part is 1. (Α) is a type Ε type iron core assembled in a coil laminate. Plan view at the time. (B) is the BB cross-section view of (A). In essence, the above shows the assembled state of the device of Figure 1. As described in (11), the iron loss PPe is at h = The minimum value at w .. Figure 8 is a diagram showing the structure of a third real cell example of the present invention, which is the structure when the size ratio (h / w) of the core core space * is 1/2. (A ) Is the plane 圔 of the condition that the EE core is assembled in the coil laminate. (B) is the cross-sectional view shown in (A) on its BB cross-section. Its size ratio (h / w) is 1/2, the coefficient k that minimizes the transformer loss, which can be according to the above (11) ~ (18 ) Method to estimate its range, such as; 1.4 ^ kg 1.5. (28) Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs I. HI I--------fn--J: n (Please read the back first Please pay attention to this page and fill in this page again) If iron loss PFe is increased by about 5% compared with h / w = l, but M transformer is practically considered to be an allowable range value. On the other hand, Such a flat shape of the inner side space of the iron core can flatten the cross-section of the coil laminated body 40, and can even flatten the conductor. It is related to the AC resistance of feed loss, because of the cuticle. The larger the surface area of the conductor, the lower its loss characteristics. The copper loss is reduced. "As a result, the increase in the substantial loss of the transformer may be less. 5 This paper size applies Chinese national standards ( CNS) Α4 specification (2 丨 0 X 297 mm) 12 A7 B7 436823 V. Description of the invention (13)%. Figure 9 shows the present invention. Structure diagram of the fourth embodiment ~ In the core (please read the precautions on the back before filling this page) Structure diagram when the space size ratio (h / w) is 2, (A) is the EE type The plan view of the state of the core in the coil laminate, and the cross-section drawing of (B) and (A) in the BB direction. Under the condition of h / w = 2, the coefficient k when the transformer loss is the minimum value can be calculated in the same way as the aforementioned formulas (11) to (18), then the range of k values is: * l.SSk operation 1,7 (29) The iron loss PFe is about 5% larger than that when h / w = l, but it can be considered that the transformer has no significant impact on its practicality. Only due to the lengthening of the space in the iron core, the line «'economy. Deng Central Standardization Bureau staff consumption cooperation Du printed lithograph 40 cross-sectional area lengthening. As a result, the plane of the lithograph 40 As the size becomes smaller, the actual assembly area of the transformer on the substrate is saved. For example, comparing Fig. 9 and Fig. 7, when the actual installation area of the transformer is changed to a longitudinal type, only 1/2 of its equivalent time is required. Therefore, in the field where high-density assembly is required, it can be used for this purpose because the transformer requires a small area for assembly. As explained in the above embodiments 1 to 4, the shape of the iron core when the loss ratio of the transformer to the minimum value is within the range of (h / w) 1/2 to 2 in the size ratio of the inner space portion of the iron grate. It can be explained according to formulas (18), (27), (28), and (29), and its coefficient k can be achieved within the following range. 1.4 ^ 1.7 (1/2 ^ h / tfg 2) (30) At M, a conventional transformer of JIS FEER 2.5 is used for comparison with the product of the present invention corresponding to Example 1 of the real cell. Table 1 is a comparison table of the characteristics of the conventional transformer and the product of the present invention (coefficient k = 1.61). Among them, the upper 6 items are those with a core shape. . The next two items are related to transformer loss. 1. This paper size applies to China National Standard (CNS) A4 (210X297 mm) 13 1 4 3 68 2 3 A7 B7 V. Description of the invention (1 4) < Table 1 > System J IS FEER 25. 5 Cases (k = 1.6 1) h [mm] 25.5 23.2 m Η [mm] 18.6 12.8 core h [m id] 3.4 6.2 type v [ra ni] 6.2 4.0 shape V emm 3 2 160 1782 A emm 2 44.8 58.1 loss m loss 1 0, 6 00 A e '2 iron loss 1 0. 8 2 00 V e (Please read the precautions on the back before filling this page) For the conventional 塱 transformer, the height of the EE core of the present invention Η is lower, and the length A is also shorter by about 10%. The core volume V e will be reduced by about 20%, and the core will be broken. The area A e instead increased by about 30%. The reduction of the core volume V e ^ * * indicates a reduction in the amount of magnetic material used, and therefore in manufacturing, it can be lighter. 14 paper sizes can be used in accordance with Chinese National Standards (CNS) A4 specifications (210 × 297 mm) A7 B7 436823 V. Description of the invention (15) The product is cheap and cheap. I: For the size ratio of the inner space of the iron core, the h / w and 1/2 of the conventional transformer are slightly flat. t but the product of the present invention is h / whl, 5 (please read the precautions on the back before filling in this purchase), and it will become vertical. Only the copper loss in the transformer loss is reduced by 40%, and the iron loss * is reduced by 18%. ^ From the characteristics of the transformer, it is very obvious that the performance of the transformer of the present invention is relatively good. Figure 10 shows the first part of the present invention. Fifth embodiment structure diagram. _ (A) The EA-type iron core is assembled in the bark of the coil laminate. . (B) represents the line 圏 laminated body alone. Fig. 11 is a structural diagram illustrating the shape of the EE-type iron core, of which (A) * is a front view of the assembled state of the E-type iron core. (B) is a plane drawing of the E E-type iron core. The fifth embodiment is a modification of the embodiment of FIG. 3. In the embodiment of FIG. 3 / the diameter D of the intermediate leg iron core 3 3 and the width C of the connecting iron core 35 are equal, but the design in this figure Into D < C. With this structure, the thickness b of the leg core can be made more thin and thinner. Moreover, the dimensions h and j of the inner space portion of the iron core can be set to be larger. Therefore, the area hv of the inner space portion of the iron core can be increased by K. The results show that it is effective in reducing the size and thickness of the transformer. 1 FIG. 12 is a perspective view showing the constitution of the sixth embodiment of the present invention. (A) is a state where the * EI-type iron core is assembled in the coil laminated body. (B) Coil laminated unit * Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs, (C) An explanatory diagram of the state of the E-type core of the assembly group. > Example 6 is a modification of the embodiment shown in FIG. 3, in which the iron core 30 K E I-type iron core instead of the E E-type iron core _ is used. Such a change, because K has substantially the same shape h., W of the inner space portion of the iron S, can obtain the same effect as that of the first embodiment. As described above, according to the present invention, when the size ratio (h / w) of the inner space portion of the iron core is in the range of 0, 5 to 2, the coefficient k (= V e 1 / 3 / A e 1/2) is set between 1.4 and 1, 7. Therefore, the Chinese National Standard (CNS) A4 specification (210X297 mm) applies to iron loss and copper paper size j 4 3 6 8 2 3 A7 B7 'V. Description of the invention (16) Minimization of the transformer loss minimization is effective and, compared with the transformer specified in the conventional JIS FEER 25.5, there is a miniaturization of the transformer shape. effect. At this time, there are two types of coil laminates: · single-hole type 40 and double-hole type 50, so the assembled iron core can be selected according to the needs of EE type or UU type core. _ It corresponds to the core shape of the core. The size ratio (h / w) and the coefficient k of the inner space part can be calculated by the formula (30). * (Please read the precautions on the back before filling out this page) Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs This paper is sized for the Chinese National Standard (CNS) A4 (2! 0X297 mm)