• Title/Summary/Keyword: Magnetic Inductive Method

Search Result 42, Processing Time 0.028 seconds

Study on Separation Distance to Protect Radio Service from Inductive System (유도성 시스템으로부터 무선기기 보호를 위한 이격 거리에 관한 연구)

  • Lee, Il-Kyoo;Shim, Yong-Sup;Min, Kyoung-Il;Cha, Jae-Sang;Lee, Kyong-Gun
    • Journal of Satellite, Information and Communications
    • /
    • v.6 no.1
    • /
    • pp.103-108
    • /
    • 2011
  • This paper is related radio interference from inductive system to radio device in home and industrial environment according to increasing the usage of inductive system. In order to analyze interference from magnetic field strength of inductive system, interference model was suggested and explain the method to calculate separation distance by using conversion that from magnetic field strength to magnetic dipole moment based on suggested interference model. Also, scenario that interference occur between inductive system and radio device was shown and the separation distance between inductive system and radio device was calculate with that scenario. The suggested method in this paper will be used to secure the compatibility between inductive system and radio device.

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
    • /
    • v.12 no.3
    • /
    • pp.1211-1218
    • /
    • 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.

Analysis of RF Inductive Couplers for Power Line Communication (전력선 통신의 RF 유도형 결합기 해석)

  • Noh, Young Seok;Lee, Gunbok;Park, Wee Sang
    • KEPCO Journal on Electric Power and Energy
    • /
    • v.1 no.1
    • /
    • pp.85-91
    • /
    • 2015
  • We investigated the structure of inductive coupler and its magnetic coupling to increase the transmission coefficient for power line communication. A Rogowski coil, which is an air-cored inductive coupler, and a magnetic cored coupler were fabricated to analyze the transmission coefficient for different coupler parameters. This paper proposes the impedance matching method using lumped elements and an impedance transformer to increase the transmission coefficient. In the experiment, the transmission coefficient of the proposed system was increased in both narrowband and broadband cases, and a trade-off between the transmission coefficient and the bandwidth was shown. This method will be useful for the further study of impedance matching with the load variation.

Development of a Non-contact Electric Power Transferring System by Using an Inductive Coupling Method (자기 유도방식을 이용한 550 VA 급 비접촉 전력전송기기의 개발)

  • Kim, Jin-Sung;Lee, Yu-Ki;Kim, Se-Ryong;Lee, Jae-Gil;Park, Gwan-Soo
    • Journal of the Korean Magnetics Society
    • /
    • v.22 no.3
    • /
    • pp.97-102
    • /
    • 2012
  • In this paper, a non-contact power transferring has been performed. Power Transferring by using an electromagnetic inductive coupling is more suitable for high power transmission than by using a magnetic resonance method. Power transferring system has been designed with Loading Distribution Method to divide the electric and magnetic loading for designing the magnetic core and electric coil. To design optimum shapes of magnetic yoke, 3D finite element analysis has been performed. Experimental results show good agreement with numerical ones. So, it could be adopted in the electric power transferring system for a short-distance wireless electric power transferring machine.

The realization of the Dimmable Magnetic Ballast for HID Lamps by the Life Time Extension Method of the Relays (릴레이 수명 연장 방법에 의한 HID램프용 디밍 자기식 안정기의 구현)

  • Jung, Kwang-Hyun;Lee, Hyeon-Jin;Park, Chong-Yeon
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.58 no.3
    • /
    • pp.516-522
    • /
    • 2009
  • The dimmable magnetic ballast which applies the variable inductor needs a switching process for the dimming process, and it consists of mechanical relays because of costs and reliabilities. However, it is hard to operate with correct timing in mechanical relay, so relays reduce their own life time in inductive applications. Moreover this creates a destructive problem at the switching process. The life time reduction of relays means the life time reduction of the ballast. Thus, in this paper, we described the problem at the witching process in the dimmable magnetic ballast with a variable inductor, which consists of relays and the soft AC switching method in order to solve the problems. As result, we achieved the improvement of the life time and reliability of the ballast.

The Study on Current Limiting Characteristic Analysis of Magnetic Shielding Type Fault Current Limiter

  • Lee, Jae;Lim, Sung-Hun;Kang, Hyeon-Gon;Ko, Seok-Cheol;Han, Byoung-Sung
    • Progress in Superconductivity
    • /
    • v.3 no.2
    • /
    • pp.235-240
    • /
    • 2002
  • In this paper, we investigated the current limiting characteristic in the magnetic shielding type fault current limiter(MSFCL). The circuit analysis was executed by using finite differential method(FDM). This paper suggests that the current limiting performance can be achieved in two ways (resistive and inductive one), according to design parameter. By comparing current limiting characteristics in two ways and surveying the important parameters which determine the operational way after fault occurs in the design of MSFCL, it is shown that the magnetic shielding type fault current limiter can be operated in either resistive or inductive way.

  • PDF

Implementation of Wireless Power Transfer Circuit by Using Magnetic Resonant Coupling Method

  • Lho, Young-Hwan
    • Journal of IKEEE
    • /
    • v.23 no.1
    • /
    • pp.306-309
    • /
    • 2019
  • Wireless charging is a technology of transmitting power through an air gap to an electrical load for the purpose of energy dissemination. Compared to traditional charging with code, wireless power charging has many benefits of avoiding the hassle from connecting cables, rendering the design and fabrication of much smaller devices without the attachment of batteries, providing flexibility for devices, and enhancing energy efficiency, etc. A transmitting coil and a receiving coil for inductive coupling or magnetic resonant coupling methods are available for the near field techniques, but are not for the far field one. In this paper, the wireless power transfer (WPT) circuit by using magnetic resonant coupling method with a resonant frequency of 13.45 Mhz for the low power system is implemented to measure the power transmission efficiency in terms of mutual distance and omnidirectional angles of receiver.

Efficiency Optimization with a Novel Magnetic-Circuit Model for Inductive Power Transfer in EVs

  • Tang, Yunyu;Zhu, Fan;Ma, Hao
    • Journal of Power Electronics
    • /
    • v.18 no.1
    • /
    • pp.309-322
    • /
    • 2018
  • The technology of inductive power transfer has been proved to be a promising solution in many applications especially in electric vehicle (EV) charging systems, due to its features of safety and convenience. However, loosely coupled transformers lead to the system efficiency not coming up to the expectation at the present time. Therefore, at first, the magnetic core losses are calculated with a novel magnetic-circuit model instead of the commonly used finite-element-method (FEM) simulations. The parameters in the model can be obtained with a one-time FEM simulation, which makes the calculation process expeditious. When compared with traditional methods, the model proposed in the paper is much less time-consuming and relatively accurate. These merits have been verified by experimental results. Furthermore, with the proposed loss calculation model, the system is optimized by parameter sweeping, such as the operating frequency and winding turns. Specifically, rather than a predesigned switching frequency, a more efficiency-optimized frequency for the series-parallel (SP) compensation topology is detected and a detailed investigation has been presented accordingly. The optimized system is capable of an efficiency that is greater than 93% at a coil separation distance of 200mm and coil dimensions of $600mm{\times}400mm$.

Application of a Textile-based Inductive Sensor for the Vital Sign Monitoring

  • Gi, Sun Ok;Lee, Young Jae;Koo, Hye Ran;Khang, Seonah;Kim, Kyung-Nam;Kang, Seung-Jin;Lee, Joo Hyeon;Lee, Jeong-Whan
    • Journal of Electrical Engineering and Technology
    • /
    • v.10 no.1
    • /
    • pp.364-371
    • /
    • 2015
  • In this study, we developed a feasible structure of a textile-based inductive sensor using a machine embroidery method, and applied it to a non-contact type vital sign sensing device based on the principle of magnetic-induced conductivity. The mechanical heart activity signals acquired through the inductive sensor embroidered with conductive textile on fabric were compared with the Lead II ECG signals and with respiration signals, which were simultaneously measured in every case with five subjects. The analysis result showed that the locations of the R-peak in the ECG signal were highly associated with sharp peaks in the signals obtained through the textile-based inductive sensor (r=0.9681). Based on the results, we determined the feasibility of the developed textile-based inductive sensor as a measurement device for the heart rate and respiration characteristics.

Wireless Power Transmission using Electromagnetic Inductive Coupling and LC Resonant (자기유도방식과 LC공진을 이용한 무선전력전송기기)

  • Lee, Seung-Hwan;Kimm, Hyoen-Min;Kim, Hee-Je;Kim, Su-Weon
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.62 no.3
    • /
    • pp.349-354
    • /
    • 2013
  • Wireless power transmission introduced by Tesla has instrumented by many scientists of the world. This technique first was utilized as wireless communications such as radio in long range transmission. And contactless transmission using inductive property was used on white goods. In 2007, MIT' lab introduced that new wireless power transmission by magnetic resonance which has about 50% efficiency and 2M transmission distances, it was a chance to refocus a new possibility of wireless power transmission. In this paper, using LC coupling compensate the short distances of contactless transmission, this simple method could transmit about 30cm distances. Using this approach, it can be solved the short transmission distances, a drawback of Electromagnetic inductive coupling method.