• Title/Summary/Keyword: Leakage inductance

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Calculation of Leakage Inductance of Integrated Magnetic Transformer with Separated Secondary Winding Used in ZVS PSFB Converter

  • Tian, Jiashen;Zhang, Yiming;Ren, Xiguo;Wang, Xuhong;Tao, Haijun
    • Journal of Magnetics
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    • v.21 no.4
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    • pp.644-651
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    • 2016
  • A novel zero voltage switching (ZVS) phase shift full bridge (PSFB) converter used in geophysical exploration is proposed in this paper. To extend the ZVS ranges and increase power density of the converter, external inductor acting as leakage inductance is applied and integrated into the integrated magnetic (IM) transformer with separated secondary winding. Moreover, the loss of ZVS PSFB converter is also decreased. Besides, the analysis and accurate prediction methodology of the leakage inductance of the IM transformer are proposed, which are based on magnetic energy and Lebedev. Finally, to verify the accuracy of analysis and methodology, the experimental and finite element analysis (FEA) results of IM transformer and 40 kW converter prototypes are given.

A Study on the Analysis of Internal Power Loss Including Leakage Inductance of Power Transformer for DAB Converter (DAB 컨버터용 전력 변압기의 누설 인덕턴스를 포함한 내부 전력 손실 분석에 관한 연구)

  • Yoo, Jeong Sang;Ahn, Tae Young;Gil, Yong Man
    • Journal of the Semiconductor & Display Technology
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    • v.21 no.2
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    • pp.95-100
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    • 2022
  • In this paper, a power loss analysis technique of a high-frequency transformer of a bidirectional DAB (Dual Active Bridge) converter is reported. To miniaturize the transformer of the dual active bridge converter, a resonant inductor was designed with an air gap included low-coupled rate state core to combine leakage inductor with the resonant inductor which is required for soft-switching. In this paper, leakage inductance and magnetizing inductance, core material, type of winding and winding method are included in the dual active bridge transformer loss analysis process to enable optimal design at the initial design stage. Transformer loss analysis for dual active bridge with a switching frequency of 200 kHz and maximum output of 5 kW was executed, and elements necessary for design based on the number of turns on the primary side were graphed while maintaining the transformer turns ratio and window area. In particular, it was possible to determine the optimal number of turns and thickness of the transformer, and ultimately, the total loss of the transformer could be estimated.

Current Unbalance Improved Half-bridge LLC Resonant Converter using the Two Transformers (두 개의 변압기를 이용한 전류불균형 개선 하프브리지 LLC 공진형 컨버터)

  • Yoo, Doo-Hee;Jeong, Gang-Youl
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.2
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    • pp.497-507
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    • 2010
  • This paper presents current unbalance improved half-bridge LLC resonant converter using the two transformers with different leakage inductances. The proposed converter resonates with the leakage inductance and magnetizing inductance of the transformer and the resonant capacitance. The converter operates in a wide load range and satisfies the zero voltage switching even under the light load. The series-parallel connected two transformers act as the transformers or the resonant inductances according to the operational modes, and the separate output filter inductance in the transformer secondary is not needed using the leakage inductance. The current unbalance of the secondary diode rectifier is improved using the different leakage inductances of the two transformers and the asymmetrical pulse-width modulation (PWM). In this paper, the operational principle of the converter is explained by the modes, and the design example for the prototype is also shown. To validate the performance of the converter, the prototype is implemented as the designed circuit parameters and the good performance of the proposed converter is shown through the experimental results

Efficiency Characteristics of Half-bridge Series Resonant Converter for the Contact-less Power Supply (Half-bridge 직렬공진 컨버터 적용 무접점 전원장치 효율특성)

  • Lee, Hyun-Kwan;Song, Hwan-Kook;Kim, Eun-Soo;Kim, Yoon-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.5
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    • pp.884-891
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    • 2007
  • Comparing with the conventional transformer without the air gap, a contact-less transformer with the large air-gap (4.8cm) between the long primary winding and the secondary winding has the increased leakage inductance and the reduced magnetizing inductance. By the increased leakage inductance and the reduced magnetizing inductance on the primary of the contact-less transformer, a good deal of the primary current circulates through magnetizing inductance, which results in a massive loss and the high voltage gain characteristics for load variations in contact-less power supply (CPS). To consider these characteristics, in this paper, the efficiency characteristics of the contact-less power supply using a series resonant converter is presented, described and verified through theoretical analysis, computer simulation and experimental test of 2.5kW prototype.

A Study on the Leakage Inductance in Current Transformers by 3D Integral Methods (3차원 적분법을 이용한 변류기의 누설 인덕턴스에 대한 연구)

  • Lee, Hee-Kab;Park, Yong-Pil;Lee, Sung-Ill
    • Proceedings of the KIEE Conference
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    • 2002.11a
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    • pp.116-118
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    • 2002
  • This paper presents leakage magnetic field and leakage inductance calculations in current transformer by means of 3-D Integral methods. From the distribution diagram of leakage magnetic flux to be analyzed using program called TRACAL 3, it confirms a parallel to the winding axis direction of the leakage flux lines in the air gap between the windings. The leakage inductances $L_{r1}\;and\;L_{r2}$ of the primary and secondary windings were calculated, their values are 4.23 mH and 0.49 mH, respectively. They are also similar to the measured values of the leakage inductances for the experimental verification, 4.06 mH and 0.47 mH.

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Parameters On-line Identification of Dual Three Phase Induction Motor by Voltage Vector Injection in Harmonic Subspace

  • Sheng, Shuang;Lu, Haifeng;Qu, Wenlong;Guo, Ruijie;Yang, Jinlei
    • Journal of international Conference on Electrical Machines and Systems
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    • v.2 no.3
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    • pp.288-294
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    • 2013
  • This paper introduces a novel method of on-line identifying the stator resistance and leakage inductance of dual three phase induction motor (DTPIM). According to the machine mathematical model, the stator resistance and leakage inductance can be estimated using the voltage and current values in harmonic subspace. Thus a method of voltage vector injection in harmonic subspace (VVIHS) is proposed, which causes currents in harmonic space. Then the errors between command and actual harmonic currents are utilized to regulate the machine parameters, including stator resistance and leakage inductance. The principle is presented and analyzed in detail. Experimental results prove the feasibility and validity of proposed method.

Parameter Measurement and Identification for Induction Motors (유도 전동기의 매개변수 측정 및 동정)

  • 김규식;김춘환
    • The Transactions of the Korean Institute of Power Electronics
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    • v.6 no.3
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    • pp.282-290
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    • 2001
  • The accurate identification of the motor parameters is crucially important to achieve high dynamic performance of induction motors. In this paper, th motor parameters such as stator(rotor) resistance, stator(rotor) leakage inductance, mutual inductance, and rotor inertia are measured in off-line. Stator(rotor) resistance and stator(rotor) leakage inductance are measured based on the stationary coordinate equations of induction motors. On the other hand, mutual inductance are measured under the scalar control. Finally, the inverse rotor time constant is identified in on-line using an extended kalman filter algorithm. To demonstrate the practical significance of the results, Some experimental results are presented.

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Analysis of Interleave Effect for Toroidal Type Transformer Windings (토로이달 타입 변압기 권선의 Interleave 효과 분석)

  • Shin, Kyoung-Gu;Kang, Byeong-Geuk;Lee, Kuk-Hee;Chung, Se-Kyo
    • Proceedings of the KIPE Conference
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    • 2014.07a
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    • pp.329-330
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    • 2014
  • This paper presents an analysis of the interleaved effects for the secondary winding distribution of a toroidal transformer. The equations to calculate the leakage inductance are derived using the MMF diagram for the distributed secondary windings. The simulation and experimental results are provided to show the effect of the leakage inductance reduction.

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Induction motor sensor less speed control by stator flux oriented method (고정자 자속 기준 제어 방식에 의한 속도검출기 없는 유도전동기 속도 제어 시스템)

  • Park, Min-Ho;Kim, Kyoung-Seo;Kim, Heui-Wook
    • Proceedings of the KIEE Conference
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    • 1989.11a
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    • pp.268-272
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    • 1989
  • To avoid the use of position sensor or flux sensor in a field oriented induction machine drive system, the terminal quantities are often used to estimate the rotor flux. Since the estimation involves the leakage inductance of the machine, the performance of such systems is sensitive to the variations of leakage. Since estimation of the stator flux is independent of the leakage, the steady state performance of the stator flux oriented system is insensitive to the leakage inductance. In this paper, the torque response of stator flux oriented system is compared to that of rotor flux oriented system by digital simulation. And induction motor sensor less speed control by stator flux oriented method is developed. The performance of the speed estimation is showed by digital simulation.

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An Analysis on the Characteristics of the Contact-less Power Supply (무접점 전원장치의 특성분석)

  • Lee, Hyun-Kwan;Lee, Gi-Sik;Chung, Bong-Geun;Kang, Sung-In;Kong, Young-Su;Kim, Eun-Soo;Kim, Yoon-Ho
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.919-922
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    • 2006
  • Comparing with the conventional transformer without the air gap, a contact-less transformer with the large air-gap (4.8cm) between the long primary winding and the secondary winding has the increased leakage inductance and the reduced magnetizing inductance. By the increased leakage inductance and the reduced magnetizing inductance on the primary of the contact-less transformer, a good deal of the primary current circulates through magnetizing inductance, which results in a massive loss in contact-less power supply (CPS). In this paper, the efficiency characteristics of the contact-less power supply using a series resonant converter is analyzed and simulated. The results are verified on the simulation based on the theoretical analysis and the 1.8kW experimental prototype.

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