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Transformer TOKIN Taiwan Co., Ltd Sales & Marketing Division, Asia Chiyoda First Bldg., 8-1, Nishi-Kanda 3-chome, Chiyoda-ku, Tokyo 101-8362, Japan Phone: +81-3-3515-9224 Fax: +81-3-3515-9223 Sales & Marketing Division, Americas and Europe Chiyoda First Bldg., 8-1, Nishi-Kanda 3-chome, Chiyoda-ku, Tokyo 101-8362, Japan Phone: +81-3-3515-9222 Fax: +81-3-3515-9223 TOKIN Korea Co., Ltd. 518, Korea City AIR-Terminal B/D, 22, Teheran-ro 87 gil, Gangnam-gu, Seoul 06164, Korea Phone: +82-2-551-3651 Fax: +82-2-551-3650 TOKIN America Inc. (Headquarters & Western Area Sales) 2560 North First Street, Suite 100, San Jose, California 95131, U.S.A. Phone: +1-408-324-1790 Fax: +1-408-324-1497 Chicago Branch (Northeast Sales Office) 1600 Golf Road, Corporate Center-Suite 1228, Rolling Meadows, Illinois 60008, U.S.A. Phone: +1-847-981-5047 Fax: +1-847-981-5051 Austin Branch (Southeast Sales Office) 11782 Jollyville Road, Suite 208, Austin, Texas 78759, U.S.A. Phone: +1-512-219-4040 Fax: +1-512-219-4007 TOKIN Hong Kong Ltd. Unit Nos. 1513-1515, Level 15, Tower ͹, Grand Central Plaza, 138 Shatin Rural Committee Road, Shatin, New Territories, Hong Kong Phone: +852-2730-0028 Fax: +852-2375-2508 TOKIN Shanghai Co., Ltd. Room 301-303, Metro Plaza, No.555 Loushanguan Road, Changning District, Shanghai, China 200051 Phone: +86-21-6228-0606 Fax: +86-21-6228-6862 Shenzhen Branch Unit 2659-2660, 26/F, Dong Fang Plaza, No.1072 Jian She Road, Luohu, Shenzhen City, Guangdong, China, 518001 Phone: +86-755-2295-4481 Fax: +86-755-2295-4486 TOKIN Singapore Pte Ltd. 150 Changi Road, #04-02 Guthrie Building, Singapore 419973 Phone: +65-6345-3181 Fax: +65-6345-6016 Transformer TOKIN Taiwan Co., Ltd. Room 411, 4F, No.9, Lane 3, Minsheng W.Road, Taipei 104, Taiwan Phone: +886-2-2521-3998 Fax: +886-2-2521-3993 TOKIN Europe GmbH Hellersbergstrasse 14, D-41460 Neuss, Germany Phone: +49-2131-1866-0 Fax: +49-2131-1866-18 France Branch Bâtiment FUJI YAMA, 1, avenue de l’Atlantique, 91940 LES ULIS, France Phone: +33-1-60-921137 Fax: +33-1-60-921146 ©TOKIN Corporation 2017 Vol. 7 For inquiry, Please call Product Management Department (Japan) Phone: +81-3-3515-9260 Fax: +81-3-3515-9261 O[[W!^^^[VRPUJVT ●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact TOKIN for updated product data. ●Please request for a specification sheet for detailed product data prior to the purchase. ●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog. 9616TRAVOL07E1704E1 Contents INTRODUCTION ���������������������������������������������������� 3 Example of Use ����������������������������������������������������� 4 Materials for Design ������������������������������������������������� 5 (1) Forward Converter Method ������������������������������������ 5 (2) Flyback Method ���������������������������������������������� 9 Transformers/Choke Coils Series ������������������������������������ 12 List of Core Set Shapes ����������������������������������������� 13 Custom Transformer Series (Through-hole type) ���������������������� 21 ●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact TOKIN for updated product data. ●Please request for a specification sheet for detailed product data prior to the purchase. ●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog. 9616TRAVOL07E1704E1 INTRODUCTION As semiconductor devices become ever more advanced, the demand for thinner, more compact devices with higher efficiency and functionality are increasing. Owing to technologies such as high-density mounting for the switching power supplies, requirements for transformers and chokes are becoming increasingly rigorous. Under the motto "Reliability based on high quality material," TOKIN uses selected excellent materials to provide diverse transformers and choke coils that can meet the requirements for a wide range of applications, such as small toroidal structure types with little heat effect and minimal emission noise to peripheral parts. Transformer VOL.07 3 ●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact TOKIN for updated product data. ●Please request for a specification sheet for detailed product data prior to the purchase. ●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog. 9616TRAVOL07E1704E1 Example of Use Flyback Method Forward Method Main Transformer Smoothing Choke Coil (EI, EE, ER, FPQ) (EI, OH, SHP) Main Transformer (EI, EE, ER, FPQ) Local Regulator Local Regulator Normal Mode Line Filter (SN) Normal Mode Line Filter (SN) Output 2 Driving Transformer Output 2 (EI, EE) Normal Choke Coil (SBC) Normal Choke Coil Input (SBC) Output 1 Input Output 1 Common Mode Line Filter (SC, SU, SS) Common Mode Line Filter (SC, SU, SS) Control Circuit Photo Auxiliary Coupler Power Supply Auxiliary Power Supply Transformer (EI, EE) 4 Transformer Vol.06 Transformer VOL.07 ●All specifications4 in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data. ●Please request for a specification sheet for detailed product data prior to the purchase. ●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog. ●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact TOKIN for updated product data. ●Please request for a specification sheet for detailed product data prior to the purchase. ●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog. 9616TRAVOL06E1003E1 9616TRAVOL07E1704E1 Materials for Design {Design Method At present, there are two major types of circuits for the typical switching power supply units: the forward converter method and the flyback method. (See Figure 1.) The following section introduces the design method of the high frequency transformers for each of the two types mentioned above. Forward Converter Method Flyback Method Figure 1 Circuit Method of Switching Power Supply (1)Forward Converter Method 1)Transformers i1 i2 D1 EL iout T e1 n1 n2 e2 E0 C Tr1 B VC-E Voltage Waveform E 0 Ton Toff T Figure 2 Circuit Diagram of Forward Converter Figure 2 is the basic circuit diagram of the forward converter method. When the bias (pulse) of forward direction is applied to the base of the switching transistor (Tr1), Tr1 is ON, e1 (V) is impressed to the primary windings n1 of the transformer "T", and at the same time the voltage as found by the following formula is generated to the secondary windings n2: n2 e2 = ҂ e1(V) ......................................................ቢ n1 e1: Input voltage of transformer e2: Output voltage of transformer n1: Number of primary windings n2: Number of secondary windings Transformer Vol.06 5 Transformer VOL.07 ●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product5 data. ●Please request for a specification sheet for detailed product data prior to the purchase. ●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog. ●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact TOKIN for updated product data. ●Please request for a specification sheet for detailed product data prior to the purchase. ●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog. 9616TRAVOL06E1003E1 9616TRAVOL07E1704E1 Therefore, the output voltage is found by the ratio of n1 and n2. Also, from the law of equal ampere turns, the following formula is obtained: n1 i2 = ҂ i1 (A) ......................................................ባ n2 The primary winding is determined by the following formula: e1 4 n1 = ҂ Ton ҂ 10 ............................................ቤ ͬB ҂ Ae Ton: Transistor (Tr1) "on" time (sec) ͬB : Usage magnetic flux density (T) Ae : Core effective cross-section (cm2) At this point it is important to be aware of the value of ͬB. It must be set especially carefully, because when the magnetic flux is saturated, the inductance drops abruptly, in addition to the core loss and temperature rise. The magnetic flux density available for use is within the range from effective saturation magnetic flux density (Brms) to the effective saturation residual coercive force (Brms). However, it is necessary to set this value ͬB as shown below, considering the inevitable factors such as calorific value of the core: 1. Set the upper limit of allowable temperature of core heat. 2. The energy (Wattage) equivalent to the core loss at that time (set in the previous step 1). 3. The next time that same loss occurs and at what value (T). According to the above stated procedure, the appropriate ͬB can be set. The characteristics of the NECTOKIN TOKIN BH2 compoundBH2 compound are shown are shownin Figures in Figures 3 and 4. 3 and 4. Then,
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