1324352 九、發明說明： - 【發明所屬之技術領域】 本發明係關於一種變壓器，特別是關於一種可對高頻 電源升壓之變壓器。 【先前技術】 變壓器具有電壓、電流或阻抗轉換的功能，廣泛地應. 用於配電系統及各式電器產品。請參照圖一，其係為習知 變壓器裝置之示意圖。變壓器1係利用電能與磁能轉換感 應的原理，將一初級侧繞線11及一次級侧繞線12兩組線 圈分別旋繞在共同的鐵芯10上。 其中，初級側繞線11連接至一電源端31，次級侧繞 線12連接至一負載端32，並藉由初級側繞線n與次級侧 繞線12所旋繞匝數的比例來調整輸出至負載端32的電壓 與電流。 理論上，當變壓器的轉換效率為100%時，初級側繞 線11的輸入功率與次級側繞線12的輸出功率相同，但實 際上由於激磁所產生的磁力線不可能全部被侷限在鐵芯 W中，再加上其他損耗，轉換效率必定有所損失。 一般來說，變壓器丨運作時所產生的損失要項有鐵 損、銅損及絕緣我漏損失，而目前的工業技術能力已可將 上述損失控制在合理的範圍内。 但疋，當頻率超過音頻(約2〇KHz)，且要將電壓升高 到2000V以上時’轉換損失會顯著的增加。其中，鐵損及 5 原因，主要的原因則是分佈電容量與雜散電 算··關於電谷讀功率損失的影響，可依照下列算式來估 電容抗的計算式：Xe = 1/27r x F x c 電容量以1PF、頻率為lOOKhz代入， 可得電容抗： 1/2 X 3.14 X l〇〇EXP3 x 1EXPI2 = i.59MQ 當電壓值為8000V時，損失功率為： 8000V2 + ι.59ΜΩ=4〇νΑ 由上述計算得知，即使只有lpF電容量，當頻率為 lOOKhz時’即會產生r 59ΜΩ的容抗，此容抗值在電壓值 1000V時，職失的功率尚不顯著，但在電壓值_ 時’損失功率可達40VA。 然而，變壓器為傳統繞線方式時，其分佈 於1PF ’因此將造成極大的神損失，而使得鷄電路或 變壓器本身無法承受。 ««月參照圖一 A，其係為習知變壓器丨之次級側繞線12 工法不意圖。圖中顯示了次級側繞線12以傳統的「往返重 疊繞法」旋繞於鐵芯10的外部，其中，鐵芯1〇外部通常 會先套設一繞線架13，然後再將次級側繞線12(如：銅線） 旋繞於繞線架13上’且繞滿一層後再繞第二層，如此往返 地旋繞’直到繞滿所設計的阻數(圈數）。 上述的繞線工法L在層與層之間所形成的分佈電容係 以並聯的方式一層層地向外累積，因此當變壓器 的工作頻料’触損失會隨著電壓升高岐漸增加。’1324352 IX. Description of the Invention: - Technical Field of the Invention The present invention relates to a transformer, and more particularly to a transformer capable of boosting a high frequency power supply. [Prior Art] Transformers have functions of voltage, current or impedance conversion, which are widely used in power distribution systems and various electrical products. Please refer to Figure 1, which is a schematic diagram of a conventional transformer device. The transformer 1 uses a principle of electric energy and magnetic energy conversion induction to wind a primary side winding 11 and a primary side winding 12 two sets of coils on a common core 10, respectively. Wherein, the primary side winding 11 is connected to a power terminal 31, and the secondary side winding 12 is connected to a load terminal 32, and is adjusted by the ratio of the number of turns of the primary side winding n to the secondary side winding 12. The voltage and current output to the load terminal 32. Theoretically, when the conversion efficiency of the transformer is 100%, the input power of the primary side winding 11 is the same as the output power of the secondary side winding 12, but in reality, the magnetic lines of force generated by the excitation cannot be all confined to the core. In W, plus other losses, the conversion efficiency must be lost. In general, the losses caused by the operation of the transformer are iron loss, copper loss and insulation loss, and the current industrial technology capability can control the above losses within a reasonable range. However, when the frequency exceeds the audio (about 2 〇 KHz) and the voltage is raised above 2000V, the conversion loss increases significantly. Among them, the iron loss and 5 reasons, the main reason is the distribution of capacitance and stray calculations · About the impact of electric valley read power loss, can be estimated according to the following formula: Xe = 1/27r x F Xc Capacitance is substituted with 1PF and frequency of lOOKhz. Capacitive reactance is available: 1/2 X 3.14 X l〇〇EXP3 x 1EXPI2 = i.59MQ When the voltage value is 8000V, the power loss is: 8000V2 + ι.59ΜΩ=4 〇νΑ According to the above calculation, even if there is only lpF capacitance, when the frequency is lOOKhz, the capacitive reactance of r 59ΜΩ will be generated. When the capacitance value is 1000V, the power loss is not significant, but the voltage is not significant. When the value _, the loss power can reach 40VA. However, when the transformer is in the conventional winding mode, it is distributed at 1 PF', which will cause great loss of God, making the chicken circuit or the transformer itself unbearable. ««The month refers to Figure 1A, which is not intended for the secondary side winding 12 of the conventional transformer. The figure shows that the secondary side winding 12 is wound around the outside of the iron core 10 by a conventional "reciprocating overlap winding method", wherein the outer core of the iron core 1 is usually first wrapped with a bobbin 13, and then the secondary The side winding 12 (e.g., copper wire) is wound on the bobbin 13 and wraps around the second layer and then revolves around the winding layer until it is wound up to the designed number of turns (turns). The above-mentioned winding method L distributes the distributed capacitance between the layers in a layered manner in a parallel manner, so that when the operating frequency of the transformer is reduced, the contact loss increases as the voltage increases. ’
在一測試實驗中，在電源端施加預期的電壓值，當頻 率在20Khz時，消耗功率約6〇VA。而當頻率升高至i〇〇L 時，消耗功率達到3G0VA，而造成驅動電路無法負荷，保 護電路立刻動作。 請參照圖二B，其係為習知類！!之另—種次級側繞 線工法示意圖。圖中顯* 了次級側繞線12以傳統的「多溝 槽繞法」旋繞於鐵芯10的外部。其中，鐵芯1〇外部通常 會先套設-繞、_ 13，且繞_ 13上具有複數個突出部 131以區隔出複數個溝槽。然後’再將次級側繞線12(如： 銅線)旋繞於該些溝槽内，直職滿所設計職數(圈數）。 同樣地’將上述之變壓器進行相同條件的測試實驗， 在電源端施加預期的電壓值，當頻率在2〇Khz時消耗功 率約6隱。而當鮮料至職hz時，雜功率約為 180VA。雖然消耗功率較前一實施例小，但次級侧繞線12 的較高電壓_近發生電暈放電(CG_)縣，而造成急 速的溫升現象(約5分鐘内即超過8()。〇。這樣的溫升現 象.，容易造成變壓裝置過熱而損壞。 因此’藉由上述之實驗可以得知，高頻率的升壓裝置 若要順利運作’必須克服繞線的分佈電容量及介質放電的 問題》 近年來，大尺寸液晶顯示器内背光裝置所使用的外部 1324352 電極螢光燈(EEFL)、冷陰極燈管（CCFL)、整面型背光源 (卯L)或電漿產生器··.等，其工作頻率皆大於2〇Khz，/皆 必須使用高頻的變壓器來驅動。因此，如何降低變壓器在 高頻時的功率損失，實為當前技術所必須解決的問題。 【發明内容】 本發明之一目的係在於有效降低變壓器之繞線的雜散 電容量、層間分佈電容量及對地電容量。當工作頻率處於 較高工作頻率時，變壓器之功率損失不會隨著電壓而 顯著增加。 ％ 巧本發明之另-目的係在於藉由本發明之繞組結構，使 得變壓器在高頻升壓的情況下，驅動電路與變壓器不 生顯著的溫升。 本發明提供一種變壓器，包括一鐵芯及至少一繞組。 繞組係由一長條型絕緣層與設置於絕緣層上之一導體層旋 繞於鐵芯外部而成，其中導體層之寬度小於絕緣層之寬度。 ^另外’變壓器更包括一初級側繞線，旋繞於鐵芯外部。 虽變壓器為升壓變壓H時，初級侧繞線之@數小於繞組之 匝數，且初級側繞線係連接至電源端，次級繞組係連接 負载端。 本發明提供一種變壓器的製造方法，至少包括下列步 驟： 提供一鐵芯。 提供一長條型之絕緣層。 8 設置一導體層於絕緣層上，且導體層之寬度小於絕緣 層之寬度。 同時將疊置在一起的絕緣層與導體層旋繞於鐵芯外 部。 關於本發明之優點與精神’以及更詳細的實施方式可 以藉由以下的實施方式以及所附圖式得到進一步的瞭解。 【實施方式】 請參照圖三，其係為本發明之變壓器之示意圖。變壓 器2，包括一鐵芯20、一初級側繞線21及至少一繞組22。 初級侧繞線21旋繞於鐵;^ 20外部，可連接至一電源 端31。在本發明中，係用一繞組22來取代習知變壓器的 次級側繞線。請同時參照圖四A，其係為繞組22旋繞於鐵 芯20外部之示意圖。繞組22係由一長條型絕緣層221與 設置於絕緣層221上之一長條型導體層222同時旋繞於鐵 芯20外部而成。其中，導體層222之寬度小於絕緣層221 之寬度’且導體層222可電性連接至一負載端。如圖所示， 在較佳實施例中，導體層222係被拉出，且連接至複數個 端子24，接著再由端子24連接到負載端。 另外，鐵芯20外部與繞組22之間，及鐵芯2〇外部與 初級側繞線21之間，通常皆設置有繞線架23。也就是說; 鐵怎2〇外部通常會先套設繞線架23，然後再將初級側繞 線21與繞組22旋繞於繞線架23上。 在本發明之實施例中，鐵芯20可為外鐵式、内鐵式或 單獨一支棒形。絕緣層221可為一低介電係數之塑膠膜或 紙。導體層222可為一條疊置於絕緣層221上的銅箔、鋁 箔或者直接蒸鍍於絕緣層221上之金屬層。 並且’在較佳實施例中，絕緣層221寬度約為導體層 222寬度之1.5倍以上。絕緣層22.1及導體層222皆可具有 相當薄的厚度，使得繞組22即使具有相當多的旋繞匝數， 其導體厚度是依據流過電流而定，當用於升壓時次級電流 非常小所以導體厚度以微米計算。 請參照圖四Β，其係為繞組22旋繞於鐵芯20之橫截In a test experiment, the expected voltage value was applied at the power supply terminal, and when the frequency was 20 Khz, the power consumption was about 6 VA. When the frequency rises to i〇〇L, the power consumption reaches 3G0VA, and the drive circuit cannot be loaded, and the protection circuit operates immediately. Please refer to Figure 2B, which is a custom class! Another alternative is a schematic diagram of the secondary side winding method. In the figure, the secondary side winding 12 is wound around the outside of the core 10 by a conventional "multi-groove winding method". Wherein, the outer portion of the core 1 is usually sleeved-wound, _ 13, and has a plurality of protrusions 131 on the _ 13 to partition a plurality of grooves. Then, the secondary side winding 12 (such as a copper wire) is wound around the grooves, and the design number (number of turns) is filled. Similarly, the above-mentioned transformer was subjected to the test of the same conditions, and the expected voltage value was applied to the power supply terminal, and the power consumption was about 6 hidden when the frequency was 2 〇 Khz. When the fresh material comes to hz, the power is about 180VA. Although the power consumption is smaller than in the previous embodiment, the higher voltage of the secondary side winding 12 is near to the corona discharge (CG_) county, causing a rapid temperature rise phenomenon (more than 8 (about 5 minutes). 〇. Such a temperature rise phenomenon, it is easy to cause the transformer device to overheat and damage. Therefore, it can be known from the above experiment that if the high frequency boosting device is to operate smoothly, it must overcome the distributed capacitance and medium of the winding. Discharge Problems In recent years, external 1324352 electrode fluorescent lamps (EEFL), cold cathode fluorescent lamps (CCFL), full-surface backlights (卯L) or plasma generators used in backlights for large-size liquid crystal displays have been included. ·., etc., whose working frequency is greater than 2〇Khz, / must be driven by a high-frequency transformer. Therefore, how to reduce the power loss of the transformer at high frequency is a problem that must be solved by the current technology. One of the objectives of the present invention is to effectively reduce the stray capacitance, the interlayer distributed capacitance and the ground capacitance of the winding of the transformer. When the operating frequency is at a higher operating frequency, the power loss of the transformer does not follow the electricity. The invention is further characterized in that, by the winding structure of the present invention, the transformer and the transformer do not have a significant temperature rise in the case of high-frequency boosting. The present invention provides a transformer comprising a The iron core and the at least one winding. The winding is formed by a long insulating layer and a conductor layer disposed on the insulating layer, and the width of the conductor layer is smaller than the width of the insulating layer. The utility model comprises a primary side winding and is wound around the outside of the iron core. Although the transformer is a step-up transformer H, the @ of the primary side winding is smaller than the number of turns of the winding, and the primary side winding is connected to the power supply end, the secondary winding The invention provides a method for manufacturing a transformer, comprising at least the following steps: providing an iron core. Providing a long strip of insulating layer. 8 arranging a conductor layer on the insulating layer, and the width of the conductor layer is smaller than the insulation Width of the layer. At the same time, the insulating layer and the conductor layer stacked together are wound around the outside of the core. Regarding the advantages and spirit of the present invention, and a more detailed implementation The present invention can be further understood by the following embodiments and the accompanying drawings. [Embodiment] Referring to Figure 3, it is a schematic diagram of a transformer of the present invention. The transformer 2 includes an iron core 20 and a primary side winding. The wire 21 and the at least one winding 22. The primary side winding 21 is wound around the iron; the outer portion of the cable 20 can be connected to a power supply terminal 31. In the present invention, a winding 22 is used to replace the secondary side winding of the conventional transformer. Referring to FIG. 4A at the same time, it is a schematic diagram of the winding 22 being wound around the outside of the iron core 20. The winding 22 is wound by a strip-shaped insulating layer 221 and a strip-shaped conductor layer 222 disposed on the insulating layer 221. The outer surface of the core 20 is formed. The width of the conductor layer 222 is smaller than the width of the insulating layer 221 and the conductor layer 222 is electrically connected to a load end. As shown, in the preferred embodiment, conductor layer 222 is pulled out and connected to a plurality of terminals 24, which in turn are connected to the load terminals by terminals 24. Further, between the outer portion of the core 20 and the winding 22, and between the outer portion of the core 2 and the primary winding 21, a bobbin 23 is usually provided. That is to say; the outer portion of the iron is usually first wound around the bobbin 23, and then the primary side winding 21 and the winding 22 are wound around the bobbin 23. In an embodiment of the invention, the core 20 may be of the outer iron type, the inner iron type or a single rod shape. The insulating layer 221 can be a plastic film or paper having a low dielectric constant. The conductor layer 222 may be a copper foil, an aluminum foil or a metal layer directly deposited on the insulating layer 221 stacked on the insulating layer 221. And, in the preferred embodiment, the width of the insulating layer 221 is about 1.5 times or more the width of the conductor layer 222. Both the insulating layer 22.1 and the conductor layer 222 can have a relatively thin thickness, so that even if the winding 22 has a considerable number of winding turns, the thickness of the conductor depends on the current flowing, and the secondary current is very small when used for boosting. The thickness of the conductor is calculated in microns. Please refer to FIG. 4 , which is a cross section of the winding 22 wound around the iron core 20 .
面示意圖。如圖所示，繞組22之橫截面中，導體層2L 係以鐵芯20為中心，由繞線架23外表面螺旋地向外旋繞。 並且，繞組22中相鄰匝之導體層222之間皆具有絕緣層 221 ,藉此使相鄰匝之導體層222不會互相接觸。而繞組 22的向壓輸出端是由低端繞組逐層重疊後自然支樓，所以 最向電壓點可遠離初級及地端，且以空間（空氣)取代一般 絕緣材料(最佳固體絕緣物之介電係數為2 〇9，而空氣之介 電係數為1)。 .一靖參照圖四C ’其係為繞組22旋繞於鐵芯2〇之縱切 面，意圖。繞組22之縱切面中，導體層222與絕緣層221 係交錯層疊於鐵20之上下兩側。如圖所示，本發明之繞 組田22係以每一層絕緣層功尸、繞一阻的「層疊繞法」逐層 ^豐起來，使得電場漸進式上升，並且使得每—阻之間的 2電容絲串·ϋ。因此，敎22 及軸級的總 分佈電容得以大幅減少。 根據上述結構，本發明之變塵器的製造方法，至少包 括下列步驟： 提供一鐵芯。 提供-長條型之絕緣層’並設置—導體層於絕緣層 上，其中導體層之寬度小於絕緣層之寬度。 將絕緣層與導體層同時旋繞於鐵芯外部，藉此形成一 繞組。在實施上，導體層可以疊置或蒸鍍的方式，設置於 該絕緣層上。 ' 旋繞一初級侧繞線於鐵芯外部。 本發明實施例中，變壓器2為升壓變壓器，繞組U 係屬於高壓輸出端’係可謂—次級繞組22，故初級側繞線 21之阻數小於次級繞組22之隨。然而，本發明之繞组 並不蚊只應隨鮮的嫩線，村 少的側繞線。 ' 請參照圖五’其係為本發明之變壓器之另一實施例之 示意圖。由於敝22係為對稱_立結構，Schematic diagram. As shown, in the cross section of the winding 22, the conductor layer 2L is centered on the core 20 and spirally spiraled outwardly from the outer surface of the bobbin 23. Further, the insulating layer 221 is provided between the adjacent conductive layers 222 of the windings 22, whereby the adjacent conductive layers 222 are not in contact with each other. The direct voltage output end of the winding 22 is a natural branch building which is overlapped by the low-end winding layer by layer, so the most voltage point can be away from the primary and ground ends, and the space (air) is substituted for the general insulating material (the best solid insulator) The dielectric constant is 2 〇9, and the dielectric constant of air is 1). Yijing refers to Figure 4C', which is intended to be a winding 22 wound around the longitudinal section of the core 2〇. In the longitudinal section of the winding 22, the conductor layer 222 and the insulating layer 221 are alternately laminated on the upper and lower sides of the iron 20. As shown in the figure, the winding field 22 of the present invention is layered by a "layered winding method" of each layer of insulating layer, and the electric field is gradually increased, and the electric field between each resistance is 2 Capacitor string ϋ. As a result, the total distributed capacitance of 敎22 and the shaft level is greatly reduced. According to the above configuration, the method of manufacturing the dust collector of the present invention comprises at least the following steps: Providing an iron core. A strip-shaped insulating layer is provided and provided with a conductor layer on the insulating layer, wherein the width of the conductor layer is smaller than the width of the insulating layer. The insulating layer and the conductor layer are simultaneously wound around the outside of the core, thereby forming a winding. In practice, the conductor layer may be stacked or vapor deposited on the insulating layer. 'Rotating a primary side winding outside the core. In the embodiment of the present invention, the transformer 2 is a step-up transformer, and the winding U is a high-voltage output terminal, which can be referred to as a secondary winding 22, so that the resistance of the primary side winding 21 is smaller than that of the secondary winding 22. However, the winding of the present invention does not require mosquitoes to follow the fresh tender line and has fewer side windings. Referring to Figure 5, there is shown a schematic view of another embodiment of the transformer of the present invention. Since the 敝22 system is a symmetrical _ vertical structure,
出時’可以在鐵芯20外部繞置所需之繞組22數目，且^ 需求作同方向献方向繞㈣疊加組合，㈣ 壓或反相電壓。 I 為了證實本發明之猶工法可財效地解料知技術 的問題’特將裝設本發明之繞組之變翻進行相同條件的 測試實驗’在電賴施加職的電壓值，當_在如版 時’消耗功率約_，大致與習知結果相同。而當 尚至lOOKhz ’次級電壓值順利達到8〇_日夺，消耗 為73VA ’相較於識__之測試條件只多出應的 1324352 消耗功率。 .. 上述增加之13VA推論係為鐵損增加以及少量的分佈 電容量所造成。所以，本發明之設計確實可以大量減少分 佈電容量及雜散電容量。另外，在本測試實驗以輸出端滿 足20Khz/8000V與100Khz/8000V相互比較並沒有顯著增 溫現象，滿載3小時後溫度約為50Ϊ以下，已達到可商品 化的規格需求。 综上所述’本發明之變壓器具有下列優點： 一、 變壓器之次級側繞線所採用之「疊層繞法」可使 最高壓端被自然支撐而遠離地端，且因減少使用高介電係 數絕緣材料作為支撐’而有效地降低變壓器之繞線間的雜 散電容量、層間分佈電容量及對地電容量。藉此，處於較 高工作頻率時’變壓器之功率損失不會隨著電壓升高而顯 著增加。 二、 藉由具有「疊層繞法」之繞組結構，使得變壓器 在高頻升壓的情況下，驅動電路與變壓器不會產生顯著的 溫升。 三、 當變壓器之次級側繞線使用本發明之繞組結構 時，繞組之高壓輸出端係從低端繞組逐層重疊而自然支 撐’所以最高電壓點可遠離初級或地端。 本發明雖以較佳實例闡明如上’然其並非用以限定本 發明精神與發明實體僅止於上述實施例爾。對熟悉此項技 術者，當可輕易了解並利用其它元件或方式來產生相同的 功效。是以’在不脫離本發明之精神與範圍内所作之修改， 12 均應包含在下述之申請專利範圍内。 【圖式簡單說明】 藉由以下詳細之描述結合所_示，將可輕易的了解 上述内容及此項發明之諸多優點，其中： 圖一係為習知變屋器之示意圖； 圖二A係為習知變壓器之次級側繞線工法示意圖； 圓-B係為$知變壓器之另一種次級側繞線 意圖； 圖二係為本發明之變壓器之示意圖； 圖四A係為繞組旋繞於鐵芯外部之示意圖； 圖四B係為繞組旋繞於鐵芯之橫截面示意圖； 圖四C係為繞組旋繞於鐵芯之縱切面示意圖；以及 圖五係為本發明之變壓器之另一實施立 4〜不思圖。 【主要元件符號說明】 10、20 :鐵芯 12 :次級側繞線 22 :繞組 222 :導體層 31 :電源端 卜2 :變壓器 11、21 :初級側繞線 13 ' 23 :繞線架 221 :絕緣層 24 ·端子 32 :負載端When it is out, the number of windings 22 required can be wound outside the core 20, and the demand is made in the same direction as the direction of the (four) superposition combination, (4) voltage or reverse voltage. I. In order to prove that the conventional method of the present invention can effectively solve the problem of knowing the technology, the test of the winding of the present invention will be carried out under the same conditions, and the voltage value of the application will be applied. At the time of the edition, the power consumption is about _, which is roughly the same as the conventional result. When the value of the secondary voltage of lOOKhz ’s went up to 8〇_day, the consumption was 73VA ’, compared with the test condition of __, only 1324352 of power consumption. The above-mentioned increased 13VA inference is caused by an increase in iron loss and a small amount of distributed capacitance. Therefore, the design of the present invention can significantly reduce the distribution capacitance and the stray capacitance. In addition, in this test, the output end is full of 20Khz/8000V and 100Khz/8000V. There is no significant temperature increase. After 3 hours of full load, the temperature is about 50Ϊ, which has reached the requirements of commercial specifications. In summary, the transformer of the present invention has the following advantages: 1. The "stack winding method" used for the secondary side winding of the transformer allows the highest pressure end to be naturally supported away from the ground end, and The electric coefficient insulating material acts as a support to effectively reduce the stray capacitance, the inter-layer distributed capacitance and the ground capacitance between the windings of the transformer. Thereby, at a higher operating frequency, the power loss of the transformer does not increase significantly with increasing voltage. Second, with the winding structure of the "stack winding method", the drive circuit and the transformer do not generate a significant temperature rise in the case of high-frequency boosting of the transformer. 3. When the secondary side winding of the transformer uses the winding structure of the present invention, the high voltage output of the winding is layered from the lower end winding to be naturally supported by the layer so that the highest voltage point can be away from the primary or ground. The present invention has been described above by way of a preferred example, and is not intended to limit the spirit of the invention and the inventive subject matter. For those skilled in the art, other components or means can be easily understood and utilized to produce the same effect. Modifications made within the spirit and scope of the invention are intended to be included within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS The above and other advantages of the invention will be readily understood by the following detailed description, in which: Figure 1 is a schematic diagram of a conventional transformer; Figure 2A It is a schematic diagram of the secondary side winding method of the conventional transformer; the circle-B system is another secondary side winding intention of the transformer; Fig. 2 is a schematic diagram of the transformer of the present invention; Fig. 4A is the winding of the winding Figure 4B is a schematic cross-sectional view of a winding wound around a core; Figure 4C is a schematic view of a longitudinal section of the winding wound around the core; and Figure 5 is another embodiment of the transformer of the present invention 4~ Don't think about it. [Description of main component symbols] 10, 20: Iron core 12: Secondary side winding 22: Winding 222: Conductor layer 31: Power supply terminal 2: Transformer 11, 21: Primary side winding 13 ' 23 : Winding frame 221 : Insulation 24 · Terminal 32: Load end