• Title, Summary, Keyword: Inductive power transfer

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Graphical Design Plane Analysis for Series-Compensated Resonant Energy Links of Inductive Wireless Power Transfer Systems

  • Jeong, Chae-Ho;Choi, Sung-Jin
    • Journal of Power Electronics
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    • v.19 no.6
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    • pp.1440-1448
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    • 2019
  • In wireless power transfer systems, it is important to design resonant energy links in order to increase the power transfer efficiency and to obtain desired system performances. This paper proposes a method for designing and analyzing the resonant energy links in a series-series configured IPT (inductive power transfer) system using the FOM-rd plane. The proposed FOM-rd graphical design plane can analyze and design the voltage gain and the power efficiency of the energy links while considering changes in the misalignment between the coils and the termination load condition. In addition, the region of the bifurcation phenomena, where voltage gain peaks are split over the frequency, can also be distinctly identified on the graphical plane. An example of the design and analysis of a 100 W inductive power transfer system with the proposed method is illustrated. The proposed method is verified by measuring the voltage gain and power efficiency of implemented hardware.

Characteristic Analysis of Inductive Power Transfer System for PRT (소형궤도 열차용 유도 전력 전송 시스템 특성해석)

  • Min, Byung-Hun;Lee, Byung-Song
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.3
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    • pp.35-43
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    • 2007
  • In this paper, the inductive power collector using electromagnetic induction for vehicle such as the PRT(Personal Rapid Transit) system is suggested and son ideas for power collector design to improve tile power transfer performance are presented. And also, the analysis of the inductive power transfer system in conjunction with series resonant converter operating variable high frequency is shown. Of particular interest is the sensitivity of the complete system to variations in operational frequency and parameters. In inductive power transfer system electrical power is transferred from a primary winding in the form of a coil or tract to one or more isolated pick-up coils that my relative to the primary. The ability to transmit power without contact enables high reliability and easy maintenance that allows inductive power transfer system to be implemented in hostile environments. This technology has found application in many fields such as electric vehicles, PRT(Personal Rapid Transit) etc. But, low output power is generated due to a loosely coupled characteristic of the large air-gap. Therefore, we will show you various characteristic of inductive power transfer system as double layer construction of secondary winding, which was divided in half to increase both output current and output voltage, a model of power collector and parallel winding structure, a model of concentration/ decentralization winding and the effects of parameter and operational frequency variation.

Practical Bifurcation Criteria considering Inductive Power Pad Losses in Wireless Power Transfer Systems

  • Kim, Minkook;Lee, Jae-Woo;Lee, Byoung Kuk
    • Journal of Electrical Engineering and Technology
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    • v.12 no.1
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    • pp.173-181
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    • 2017
  • In this paper, the bifurcation criteria for inductive power transfer (IPT) systems is suggested considering the inductive power pad losses. The bifurcation criteria for series-series (SS) and series-parallel (SP) topologies are derived in terms of the main parameters of the IPT system. For deriving precise criteria, power pad resistance is obtained by copper loss calculation and core loss analysis. Utilizing the suggested criteria, possibility of bifurcation occurrence can be predicted in the design process. In order to verify the proposed criteria, 50 W IPT laboratory prototype is fabricated and the feasibilities of the switching frequency and AC load resistance shift to escape from bifurcation are identified.

Characteristic analysis of inductive power transfer system by parameter variation (파라미터 변화에 따른 유도급전 시스템 특성해석)

  • Lee, Byung-Song;Bae, Chang-Han;Han, Kyung-Hee
    • Proceedings of the KIEE Conference
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    • pp.215-217
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    • 2004
  • This paper shows the analysis of the inductive power transfer system in conjunction with series resonant converter operating variable high frequency. Of particular interest is the sensitivity of the complete system to variations in operational frequency and parameters. In inductive power transfer system, electrical power is transferred from a primary winding in the form of a coil or track, to one or more isolated pick-up coils that may relative to the primary. The ability to transmit power without contact enables high reliability and easy maintenance that allows inductive power transfer system to be implemented in hostile environments. This technology has found application in many fields such as electric vehicles, PRT(Personal Rapid Transit) etc. The coupling between the primary and secondary is then presented to include the effects of parameter and operational frequency variation.

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Miniaturization of Inductive Resonator for Implementation of Wireless Power Transfer Technology Using Resonant Inductive Coupling (자기 공진 결합 방식을 이용한 무선 전력 전송기술 구현을 위한 자기 공진기 소형화 설계)

  • Cho, Young Seek;Park, Ji Hye;Nam, Yun Seo;Choi, Seyeong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.8
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    • pp.1798-1804
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    • 2014
  • A novel inductive resonator for the implementation of wireless power transfer using resonant inductive coupling is presented. The proposed inductive resonator is much smaller than the helix shape resonator suggested by MIT research team but operates the same resonant frequency with comparable wireless power transfer efficiency. The proposed inductive resonator is a spiral shape ($1,696cm^3$), which is 97 % smaller than the helix shape ($59,376cm^3$). The wireless power transfer efficiency is less than 9 % when compared to the helix shape resonator. With the reduce size and comparable efficiency, this novel inductive resonator can be used in practical application of wireless power transfer.

The Modeling of inductive power collector for light railway system (소형궤도차량 시스템에 적합한 유도전력 집전 장치의 모델링)

  • Han, K.H.;Lee, B.S.;Baek, S.H.
    • Proceedings of the KIEE Conference
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    • pp.215-217
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    • 2005
  • In this paper, the inductive power collector using electromagnetic induction for the PRT{Personal Rapid Transit) system is suggested and some ideas for power collector design to improve the power transfer performance are presented. The proposed the inductive power collector is used for the PRT system, which has a large air-gap and demands a large electrical power capability. But, low output power is generated due to a loosely coupled characteristic of the large air-gap. Therefore, double layer construction of secondary winding, which was divided in half to increase both output current and output voltage was suggested. Also, model of power collector and parallel winding structure are presented, in addition, the performance of inductive power collector to alignment condition between the primary power line and the inductive power transformer was verified by computer simulation of 2kW model.

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Characteristic analysis of inductive contactless power transformer laid under the road/railway for performance improvement (도로/궤도 매립형 무접촉 집전장치의 전력전달 성능개선을 위한 특성해석)

  • Han Kyung-Hee;Lee Byung-Song;Baek Soo-Hyun
    • Proceedings of the KSR Conference
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    • pp.1425-1430
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    • 2004
  • In this paper, the inductive power transformer using electromagnetic induction for the road/railway applied to contactless power transfer system is suggested and some ideas for power collector design to improve the power transfer performance are presented. The proposed the inductive power transformer is used for the light railway/road transportation system. which has a large air-gap and demands a large electrical power capability. But. low output power is generated due to a loosely coupled characteristic of the large air-gap. Therefore, double layer construction of secondary winding, which was divided in half to increase both output current and output voltage was suggested. In addition, the performance of inductive power transformer to alignment condition between the primary power line and the inductive power transformer was verified by computer simulation of 2kW model.

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The Characteristic analysis of the IPT system used for PRT(Personal Rapid Transmit) (소형궤도차량 유도전력급전 계통 특성해석)

  • Lee, B.S.;Kim, Do-Won;Han, K.H.
    • Proceedings of the KIEE Conference
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    • pp.218-220
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    • 2005
  • This paper shows the analysis of the inductive power transfer system in conjunction with series resonant converter operating variable high frequency. Of particular interest is the sensitivity of the complete system to variations in operational frequency and parameters. In inductive power transfer system, electrical power is transferred from a prima교 winding in the form of a coil or track, to one or more isolated pick-up coils that may relative to the primary. The ability to transmit power without contact enables high reliability and easy maintenance that allows inductive power transfer system to be implemented in hostile environments. This technology has found application in many fields such as electric vehicles, PRT(Personal Rapid Transit) etc. The coupling between the primary and secondary is then presented to include the effects of parameter and operational frequency variation.

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The analysis of inductive contactless inductive power transformer used for the PRT(Personal Rapid Transit) system (소형궤도 차량 시스템에 적합한 무접촉 유도 전력 변환 장치의 특성해석)

  • Han, K.H.;Lee, B.S.;Byun, Y.S.;Baek, S.H.
    • Proceedings of the KIEE Conference
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    • pp.218-220
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    • 2004
  • In this paper, the concept of contactless inductive power transfer system used for the PRT system is suggested and some ideas for Power transformer design to improve the power transfer performance are presented. This system has a large air-gap and demands a large electrical power capability But, low output power is generated due to a loosely coupled characteristic of the large air-gap. Therefore, double layer construction of secondary winding, which was divided in half to increase both output current and output voltage was suggested. In addition, the performance of power transformer alignment condition between the primary power line and the power collector was verified by computer simulation of 2kW model.

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Performance Analysis of Magnetic Power Pads for Inductive Power Transfer Systems with Ferrite Structure Variation

  • Kim, Minkook;Byun, Jongeun;Lee, Byoung Kuk
    • Journal of Electrical Engineering and Technology
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    • v.12 no.3
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    • pp.1211-1218
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    • 2017
  • In this paper, performance of rectangular shaped magnetic power pads for inductive power transfer (IPT) system according to ferrite structure is analyzed. In order to evaluate the influences of ferrite structure, six cases of magnetic power pads are proposed. Self-inductance, coupling coefficient, quality factor, and coil to coil efficiency are compared as the displacement increases in the direction of x or y axis. For accurate estimation, finite element method (FEM) simulation is used and loss components of the power pads are numerically calculated and considered. Through the simulation and measured results, effectiveness of protrusive and enveloping ferrite structure is identified.