• Title/Summary/Keyword: Transformer design

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A Study on the Optimal Design of Planar Flyback Transformers suitable for Small-size and Low-profile (소형화 및 슬림형에 적합한 평면 플라이백 변압기의 최적 설계에 관한 연구)

  • Na, Hae-Joong;Kim, Jong-Hae
    • Journal of IKEEE
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    • v.24 no.3
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    • pp.828-837
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    • 2020
  • This paper presents the optimal design of planar flyback transformer suitable for small-size and low-profile of AC to DC adapter for 10W tablet. This paper also proposes the injection winding transformer of Hybrid and Drum types capable of the winding method of automatic type and the reduction of transformer size and leakage inductance(Lk) compared to the conventional mass-production flyback transformer with the winding method of manual type. In particular, the injection winding transformer of Drum type proposed in this paper is constructed in a horizontal laying of its transformer to solve the connection problem of copper plate injection winding on the secondary side of the one of Hybrid type. The primary and secondary windings of the injection winding transformer of Hybrid and Drum types used the conventional winding and the copper plate injection winding, respectively. For the injection winding transformer of Hybrid and Drum types proposed in this paper, the optimal design of planar flyback transformer suitable for small-size and low-profile was carried out using Maxwell 2D and 3D tool.

Dielectric Insulation Properties of Double Pancake Coil Type HTS Transformer (Double Pancake Coil형 고온초전도 변압기의 전기적 절연 특성)

  • 백승명;정종만;이현수;한철수;김상현
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.2
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    • pp.151-156
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    • 2003
  • High temperature superconductor can only be applied against an engineering specofication that has to be determined for each particular application form the design requirements for economic viability and for operation margins in service. However, in order to realize the HTS transformer, it is necessary to establish the high voltage insulation technique in cryogenic temperature. Therefore, the composite insulation of double pancake coil type transformer are described and AC breakdown voltage characteristics of liquid nitrogen(LN$_2$) under HTS pancake coil electrode made by Bi-2223/Ag are studied. The Breakdown of LN$_2$ is dominated electrode shape and distance. The influence of pressure on breakdown voltage is discussed with th different electrode. For the electrical insulation design of turn-to-turn insulation for the HTS transformer, we tested breakdown strength of insulation sheet under varying pressure. And we investigated surface flashover properties of LN$_2$ and complex conition of cryogenic gaseous nitrogen(CGN$_2$) obove a LN$_2$ surface. The surface voltage of GFRP was measured as a function of thickness and electrode distance in LN$_2$ and complex condition of CGN$_2$ above a LN$_2$ surface. this research presented information of electrical insulation design for double pancake coil(DPC) type HTS transformer.

Conceptual Design and 3-D Electromagnetic Analysis of 1MVA HTS Transformer (1MVA 고온 초전도 변압기 개념 설계 및 3차원 전자장 해석)

  • 박찬배;김우석;최경달;주형길;홍계원;한송엽
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.1
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    • pp.23-26
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    • 2003
  • This paper presents conceptual design and 3-D electromagnetic analysis of IMVA transformer with BSCCO-2223 High Tc Superconducting (HTS) tapes. The rated voltages of each sides of the transformer are 22.9 kV and 6.6 kV, and double pancake windings were adopted. High voltage and Low voltage sides were composed of several double pancake windings. Four HTS tapes were wound in parallel for the windings of low voltage side and were transposed in order to distribute the currents equally in each conductor The transformer core was designed as a shell type core made of laminated silicon steel plates and the core is separated with the windings by a cryostat with Fiberglass Reinforced Plastics(FRP). A sub-cooling system using L$N_2$ were designed to maintain the coolant temperature 65K. Finally perpendicular components of magnetic field applied to tapes were calculated 0.247 in the rated operation using 3-D analysis. A real 1MVA HTS transformer will be manufactured in near future based on the design parameters presented in this paper.

Design and Application of CCFL Drive Inverter Transformer for LCD Backlight (LCD Backlight를 위한 CCFL 구동용 인버터 트랜스포머의 설계와 응용)

  • Cho, Sang-Ho;Han, Sang-Kyoo;Hong, Sung-Soo;SaKong, Sug-Chin;Kwon, Gi-Hyun;Lee, Hyo-Bum;Roh, Chung-Wook
    • The Transactions of the Korean Institute of Power Electronics
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    • v.13 no.2
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    • pp.96-102
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    • 2008
  • In a large screen sized LCD-TV, a backlight system with only one cold cathode fluorescent lamp(CCFL) can not meet brightness specification. Thus, considerable numbers of CCFLs are used to meet brightness specification. In this paper, the design guide for the inverter transformer which can drive 4 CCFLs instantaneously is presented. With the presented design, the inverter transformer that guarantee identical lamp currents under the nonidentical lamp characteristic condition, can be implemented easily. The developed inverter transformer is adopted in a 42" LCD-TV backlight. The experimental results are presented to show the validity of the presented design guide.

Optimal Design considering Magnetic Saturation Characteristic of Current Transformers for the Overcurrent Warning Circuit (과전류 경고 회로용 변류기의 자기포화 특성을 고려한 최적 설계)

  • Kim, Sun-Jong;Park, Eui-Jong;Kim, Yong-Jae
    • The Journal of the Korea institute of electronic communication sciences
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    • v.10 no.7
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    • pp.781-786
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    • 2015
  • In this paper, we analyzed characteristic of window type current transformer and we performed the optimal design consider to the loss; in order to design the current transformer figured signal of overcurrent warning circuit. The core size of window type current transformer was determined by the secondary coil turns. We analyzed current waveform, which is appeared by the number of coil turns on the core, we made sure the relation of secondary coil turns and load resistance in order to improve the non-sinusoidal wave by the flux saturation of the current transformer core. Additionally, we did improvement of the accuracy and optimal design through the transformation of the inner diameter and the stack length when the outer diameter of core is sustaining.

3D Optimal Design of Transformer Tank Shields using Design Sensitivity Analysis

  • Yingying Yao;Ryu, Jae-Seop;Koh, Chang-Seop;Dexin Xie
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.3B no.1
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    • pp.23-31
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    • 2003
  • A novel 3D shape optimization algorithm is presented for electromagnetic devices carry-ing eddy current. The algorithm integrates the 3D finite element performance analysis and the steepest descent method with design sensitivity and mesh relocation method. For the design sensitivity formula, the adjoint variable vector is defined in complex form based on the 3D finite element method for eddy current problems. A new 3D mesh relocation method is also proposed using the deformation theory of the elastic body under stress to renew the mesh as the shape changes. The design sensitivity f3r the sur-face nodal points is also systematically converted into that for the design variables for the parameterized optimization application. The proposed algorithm is applied to the optimum design of the tank shield model of the transformer and the effectiveness is proved.

A Study on LLC Resonant Transformer Design with the Winding Method of Automatic Type suitable for LLC Resonant Converter (LLC 공진 컨버터에 적합한 자동화 권선 LLC 공진 변압기 설계에 관한 연구)

  • Bae, Jun-Hyung;Kim, Jong-Hae
    • Journal of IKEEE
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    • v.23 no.3
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    • pp.1108-1111
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    • 2019
  • This paper presents the comprehensive transformer design methodology with the winding method of automatic type suitable for LLC resonant converter. The problem with conventional LLC resonant transformer is that it is difficult to implement the winding method of automatic type because all windings are wound in one bobbin. Therefore, the LLC resonant transformer, which is capable of the winding method of automatic type to multiple section bobbin without insulation tape and barrier tape, is proposed in this paper and the design procedure of the proposed LLC resonant transformer is also shown. Modeling and analysis of the proposed LLC resonant transformer using Maxwell 3D simulation tool are described in detail and a protype 150W LLC resonant converter using the proposed LLC resonant transformer manufactured by 3D modelling is also verified through the experimental test.

The vibration characteristics for noise reduction of mold transformer (몰드변압기 소음저감을 위한 진동특성 파악)

  • Kim, Ki-Won;Kim, Yang-Hann
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.11a
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    • pp.49-53
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    • 2008
  • This study deals a way to reduce the transformer noises. The first step is to identify the source of the transformer noises. The second step is obtaining the vibration characteristics of transformer; its natural frequencies and mode shapes. Based on these information, an method to reduce the vibration of transformer can be found. The cause of transformer noises is mainly due to the magnetostrictive vibration of a core which is made of ferromagnetic substances. It is well known that the magnetostrictive vibration of a core is unavoidable, and a way to reduce the transformer noise by structural design is needed. It requires understanding the vibration characteristics. The natural frequencies and the mode shapes of transformer are analyzed by performing the modal testing.

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Design technology by structure of transformer (변압기의 형태에 따른 설계기술)

  • Lee O.K.;Song H.S.
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.313-316
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    • 2003
  • Investigated about topology of each component of transformer and material choice method and property in this paper. Component of transformer is bobin, winding, insulating paper, Varnish etc. And, experiment and investigated special quality by primary winding of transformer and composition of secondary winding. Investigated loss of transformer and EMI decrease method. Investigated method to select winding size that consider frequency.

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Design Consideration of LLC resonant converter (LLC 공진형 컨버터의 설계)

  • Choi Hang-Seok
    • Proceedings of the KIPE Conference
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    • 2006.06a
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    • pp.50-52
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    • 2006
  • This paper presents design consideration for LLC resonant converter utilizing the leakage inductance and magnetizing inductance of transformer as resonant components. The leakage inductance in the transformer secondary side is also considered in the gain equation. The design procedure is verified through experimental results.

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