• Title, Summary, Keyword: Coupled inductor

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Analysis and Design of Coupled Inductors for Two-Phase Interleaved DC-DC Converters

  • Lee, Jong-Pil;Cha, Honnyong;Shin, Dongsul;Lee, Kyoung-Jun;Yoo, Dong-Wook;Yoo, Ji-Yoon
    • Journal of Power Electronics
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    • v.13 no.3
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    • pp.339-348
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    • 2013
  • Multiphase dc-dc converters are widely used in modern power electronics applications due to their advantages over single-phase converters. Such advantages include reduced current stress in both the switching devices and passive elements, reduced output current ripple, and so on. Although the output current ripple of a converter can be significantly reduced by virtue of the interleaving effect, the inductor current ripple cannot be reduced even with the interleaving PWM method. One way to solve this problem is to use a coupled inductor. However, care must be taken in designing the coupled inductor to maximize its performances. In this paper, a detailed analysis of a coupled inductor is conducted and the effect of a coupled inductor on current ripple reduction is investigated extensively. From this analysis, a UU core based coupled inductor structure is proposed to maximize the performance of the coupled inductor.

Coupled Inductor Design Method for 2-Phase Interleaved Boost Converters

  • Liang, Dong;Shin, Hwi-Beom
    • Journal of Power Electronics
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    • v.19 no.2
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    • pp.344-352
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    • 2019
  • To achieve high efficiency and reliability, multiphase interleaved converters with coupled inductors have been widely applied. In this paper, a coupled inductor design method for 2-phase interleaved boost converters is presented. A new area product equation is derived to select the proper core size. The wire size, number of turns and air gap length are also determined by using the proposed coupled inductor design method. Finally, the validity of the proposed coupled inductor design method is confirmed by simulation and experimental results obtained from a design example.

Design of Multi-winding Inductor for Minimum Inductor Current Ripple Using Optimized Coupling Factor

  • Kang, Taewon;Suh, Yongsug
    • Proceedings of the KIPE Conference
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    • pp.231-232
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    • 2016
  • This paper investigates the design of multi-winding coupled inductor for minimum inductor current ripple. Based on the general circuit model of coupled inductor together with the operating principles of dc-dc converter, the relationship between the ripple size of inductor current and the coupling factor is derived under the different duty ratio. The optimal coupling factor of n-phase multi-winding coupled inductor which corresponds to a minimum inductor ripple current becomes -(1/n-1), i.e. a complete inverse coupling without leakage inductance, as the duty ratio of steady-state operating point approaches 1/n, 2/n, ${\cdots}$ or (n-1)/n. In an opposite manner, the optimal coupling factor value of zero, i.e. zero mutual inductance, is required when the duty ratio of steady-state operating point approaches either zero or one. Therefore, coupled inductors having optimal coupling factor can minimize the ripple current of inductor and inductor size.

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A KY Converter Integrated with a SR Boost Converter and a Coupled Inductor

  • Hwu, Kuo-Ing;Jiang, Wen-Zhuang
    • Journal of Power Electronics
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    • v.17 no.3
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    • pp.621-631
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    • 2017
  • A KY converter integrated with a conventional synchronously rectified (SR) boost converter and a coupled inductor is presented in this paper. This improved KY converter has the following advantages: 1) the two converters use common switches; 2) the voltage gain of the KY converter can be improved due to the integration of a boost converter and a coupled inductor; 3) the leakage inductance of the coupled inductor is utilized to achieve zero voltage switching (ZVS); 4) the current stress on the charge pump capacitors and the decreasing rate of the diode current can be limited due to the use of the coupled inductor; and 5) the output current is non-pulsating. Moreover, the active switches are driven by using one half-bridge gate driver. Thus, no isolated driver is needed. Finally, the operating principle and analysis of the proposed converter are given to verify the effectiveness of the proposed converter.

Parallel PCS Interconnection Current Surge Elimination Technique Using a Coupled Inductor

  • Choe, Jung-Muk;Byen, Byeng-Joo;Choe, Gyu-Ha
    • Journal of Power Electronics
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    • v.14 no.5
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    • pp.827-833
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    • 2014
  • This study proposes a coupled inductor method for the parallel operation of a power conditioning system (PCS). When primary and secondary currents flow in the same direction in a coupled inductor, total flux and inductance are cancelled; when currents flow in opposite directions, each flux becomes an individual inductor. These characteristics are applied in the parallel operation of a PCS. To connect at a grid code, abnormal current, which is barred under the grid connection code, is blocked by using a coupled inductor. A design based on the capacity and current duration time of a PCS is verified through hardware implementation. Experiment results show the effectiveness of variance reduction.

Selection of Coupling Factor for Minimum Inductor Current Ripple in Multi-winding Coupled Inductor Used in Bidirectional DC-DC Converters

  • Kang, Taewon;Suh, Yongsug
    • Journal of Power Electronics
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    • v.18 no.3
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    • pp.879-891
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    • 2018
  • A bidirectional dc-dc converter is used in battery energy storage systems owing to the growing requirements of a charging and discharging mode of battery. The magnetic coupling of output or input inductors in parallel-connected multi modules of a bidirectional dc-dc converter is often utilized to reduce the peak-to-peak ripple size of the inductor current. This study proposes a novel design guideline to achieve minimal ripple size of the inductor current under bidirectional power flow. The newly proposed design guideline of optimized coupling factor is applicable to the buck and boost operation modes of a bidirectional dc-dc converter. Therefore, the coupling factor value of the coupled inductor does not have to be optimized separately for buck and boost operation modes. This new observation is explained using the theoretical model of coupled inductor and confirmed through simulation and experimental test.

Design of Three-winding Coupled Inductor for Minimum Current Ripple in Battery Chargers

  • Kang, Taewon;Suh, Yongsug
    • Proceedings of the KIPE Conference
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    • pp.195-196
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    • 2015
  • This paper investigates the design of coupled inductor for minimum inductor current ripple in rapid traction battery charger systems. Based on the general circuit model of coupled inductor together with the operating principles of dc-dc converter, the relationship between the ripple size of inductor current and the coupling factor is derived under the different duty ratio. The optimal coupling factor which corresponds to a minimum inductor ripple current becomes -0.5, i.e. a complete inverse coupling without leakage inductance, as the steady-state duty ratio operating point approaches 1/3 or 2/3. In an opposite manner, the optimal coupling factor value of zero, i.e. zero mutual inductance, is required when the steady-state duty ratio operating point approaches either zero or one. Coupled inductors having optimal coupling factor can minimize the ripple current of inductor and battery current resulting in a reliable and efficient operation of battery chargers.

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Design and Analysis of a 7kW LDC using Coupled Inductor for Heavy Hydrogen Electric Transport Vehicle (Coupled Inductor를 사용한 대형수소전기화물차용 7kW급 저전압 컨버터의 설계 및 분석)

  • Heo, Gyeong-Hyeon;Lee, Woo-Seok;Choi, Seung-Won;Lee, Il-Oun;Song, Hyung-Suk;Lee, Jun-Young
    • The Transactions of the Korean Institute of Power Electronics
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    • v.25 no.1
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    • pp.37-43
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    • 2020
  • This study proposes a 7kW low-voltage DC-DC converter (LDC) using a coupled inductor (CI) for heavy hydrogen electric transport vehicles. The LDC uses a phase-shift manner for soft switching. SiC-MOSFET is used to reduce the loss of reverse recovery current through the use of a high switching frequency. LDC is require large transformer and inductor because of large output current. The size of transformer and inductor can be reduced by deviding the transformer and inductor into two pieces each. This work presents the experimental results of the proposed circuit.

Optimized Coupling Factor for Minimizing Ripple Current of Coupled Inductor under Variable Duty in Rapid Traction Battery Charger

  • Kang, Taewon;Chae, Beomseok;Kang, Tahyun;Suh, Yongsug
    • Proceedings of the KIPE Conference
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    • pp.335-336
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    • 2014
  • This paper investigates the design of coupled inductor for minimum inductor current ripple in rapid traction battery charger systems. Based on the general circuit model of coupled inductor together with the operating principles of dc-dc converter, the relationship between the ripple size of inductor current and the coupling factor is derived under the different duty ratio. The optimal coupling factor which corresponds to a minimum inductor ripple current becomes -1, i.e. a complete inverse coupling without leakage inductance, as the steady-state duty ratio operating point approaches 0.5. In an opposite manner, the optimal coupling factor value of zero, i.e. zero mutual inductance, is required when the steady-state duty ratio operating point approaches either zero or one. Coupled inductors having optimal coupling factor can minimize the ripple current of inductor and battery current resulting in a reliable and efficient operation of battery chargers.

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A Study on the Expandable Bobbin Type Multiple Integrated Coupled-Inductor Applied 4-Pralleled Switching Rectifier (보빈 적층 방식의 다중 공유결합 인덕터를 이용한 4병렬 스위칭 정류기에 관한 연구)

  • Yoo, Jeong Sang;Ahn, Tae Young
    • Journal of the Semiconductor & Display Technology
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    • v.18 no.4
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    • pp.18-24
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    • 2019
  • In this paper, expandable bobbin type multiple integrated coupled-inductor applied 4-paralled switching rectifier was proposed. To design the proposed inductor easily, inductance designing formula was derived through magnetic circuit analysis of the 4-paralleled integrated coupled-inductor. Furthermore, to verify practicality of the proposed inductor, it was applied in 600W class 4-paralleled interleaved switching rectifier, and the steady-state characteristics of the proposed inductor and discrete inductors were compared. Consequently, it was showed that the proposed inductor can replace the conventional discrete inductors with alternative electrical characteristic standard, hence miniaturization of the SMPS can be achieved. From the test result, test circuit with the proposed inductor showed maximum 97.1% of power conversion efficiency and under 18W of power loss where the circuit with discrete inductors showed 96.7% and 20W respectively.

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