• 제목/요약/키워드: Inductive circuit

검색결과 183건 처리시간 0.021초

전기자동차 무선 충전용 수신패드 식별코일의 형상 설계 및 운용 방안 (Receiving Pad Identification Coil for Wireless Charging of Electric Vehicle)

  • 심동현;조현우;허훈;이주아;손원진;이병국
    • 전력전자학회논문지
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    • 제27권6호
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    • pp.455-463
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    • 2022
  • This study proposes a receiving pad identification coil for wireless charging of electric vehicles. The proposed coil identifies the shape of the receiving pad through magnetic coupling with the receiving pad. Therefore, the shape of the coil is designed to show the different magnetic properties of each receiving pad. The accuracy of this design is verified through finite element method simulation. Furthermore, the operation method of the secondary pad identification circuit is described, and the appropriate magnitude and length of the pulse voltage applied to this circuit for receiving pad identification are derived through simulation. The performance of the proposed identification coil set is verified by the experimental results.

유도형과 저항형 초전도한류기의 파라메타를 고려한 전력계통도입효과의 분석 및 성능평가에 관한 연구 (On the Current Limiting Characteristics and Parameters of Superconducting Fault Current Limiter Introduced to 345kV Electric Power System due to Resistive-Type, Reactive-Type and Their Performance Comparison)

  • 홍원표;김용학
    • 조명전기설비학회논문지
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    • 제16권3호
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    • pp.74-83
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    • 2002
  • 본 논문은 전력설비에 조기적용이 예상되는 초전도한류기의 파라메타를 정의하고 앞으로 개발방향을 제시하기 위하여 한류기의 동작원리, 특성 및 계통조기적용가능성들을 근거로 파라메타의 특성을 비교 ·평가하였다. 또한 한류기의 계통적용효과를 분석하기 위하여 SFCL이 기간 특고압 모델계통에 도입한 경우를 상정하여 3선지락 고장에서 저항형과 유도형 SFCL의 도입 효과에 대하여 RTDS (Real Time Digital Simulation)/EMTDC(Electromagnetic Transient DC)로 시뮬레이션하였다. 특히 저항형과 유도형의 한류효과의 비교 평가, 모선전압의 저하 억제 및 계통과 한류기의 파라메타와의 관련성에 대하여 검토하였다.

H-형태 소형 개구를 갖는 도파관 탐침의 등가회로 해석 (Equivalent Circuit Analysis of a Rectangular Waveguide Probe with H-type Small Aperture)

  • 고지환;조영기
    • 한국전자파학회논문지
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    • 제25권12호
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    • pp.1300-1305
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    • 2014
  • 근접장 마이크로파 현미경의 핵심 부품인 H-형태 소형 개구를 가진 도파관 탐침에 대해 등가회로를 표현하고 해석하였다. 파장에 비해 작은 사각형 또는 원형의 소형 개구는 유도성 성분인데, 여기에 리지 구조를 부착하는 것은 용량성 성분을 연결하여 이로 인해 투과 공진을 일으키는 것으로 볼 수 있다. 이러한 해석을 입증하기 위해 리지가 있는 소형 개구에서 용량 성분에 해당되는 리지 부분을 분리하여 대략 반파장 떨어진 지점에 세워 두고 구한 등가회로적 표현에 의한 계산 결과와 전자파 해석에 의한 계산 결과와 비교하여 거의 일치된 모습을 확인하였다. 또한, 도파관 탐침을 제작하여 반사손실을 측정하고, 계산 결과의 정확성을 확인하여 이론의 타당성을 검증하였다.

소프트 스위칭 기법을 이용한 ZVS-HB형 고주파 공진 DC-DC 컨버터의 설계 및 특성해석 (A Design and Characteristic Analysis of ZVS-Half Bridge type High-Frequency Resonant DC-DC Converter Using Soft-Switching Technique)

  • 오경섭;남승식;김경식;김동희;노채균
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제50권4호
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    • pp.179-187
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    • 2001
  • In recent years, the switching source devices have the advantage of small, light and high reliability with the high-frequency. But, high-frequency switching has disclosed disadvantage of result from stress and turn-on and turn-off peak losses at the switching instant. Accordingly, in this paper propose ZVS-HB type high-frequency resonant DC/DC converter using soft switching technique (Zero-Voltage-Switching, Zero-Current-Switching) with safety operating of circuit at diving on inductive zone, through the circuit design example using the capacitor $C_3,\;C_4$ with soft switching function and division characteristic of resonant Capacitor C, $C_1,\;C_2$, and, the characteristic analysis of circuit is generally described using normalized parameters. Also, this paper certified a rightfulness of characteristic analysis in comparison with a theoretical values and a experimental values obtain from experiment using MOSFET.

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탠덤형 자석 소호기를 사용한 760V급 직류 개폐기의 차단 특성 (760 V-Class DC Switch Breaking Characteristics Using Tandem Type Magnet Extinguisher)

  • 김효성
    • 전력전자학회논문지
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    • 제27권3호
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    • pp.175-179
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    • 2022
  • Magnetic arc extinguishing technology is effective as an extinguishing device for low-voltage direct current (DC) circuit breakers with a resistive load of ≤4 kW. The separation distance between the magnet and the electrical contact must be shortened to increase the magnetic arc extinguishing force. However, if the magnet is installed too close to the electrical contact points, the magnet is exposed to high temperatures due to the arc current generated when the load current is cut off and the magnetism is lost. To solve this problem, the effective magnetic flux density at the electrical contact can be maintained high by placing the arc extinguishing magnet in a tandem structure with the electrical contact point between them, and the proper separation distance between the contact points and the magnet can be maintained. In addition, an electric arc extinguishing technology that emits arc energy using a series circuit of diode and resistor is used to suppress the continuous arc voltage generated by the inductive load. For the proposed circuit breaker, the breaking characteristics are analyzed through the breaking test for the DC load of the 760 V level, the load power of 4 kW, and the time constant of 5 ms, and an appropriate arc extinguishing design guideline is proposed.

Secondary Side Output Voltage Stabilization of an IPT System by Tuning/Detuning through a Serial Tuned DC Voltage-controlled Variable Capacitor

  • Tian, Jianlong;Hu, Aiguo Patrick;Nguang, Sing Kiong
    • Journal of Power Electronics
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    • 제17권2호
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    • pp.570-578
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    • 2017
  • This paper proposes a method to stabilize the output voltage of the secondary side of an Inductive Power Transfer (IPT) system through tuning/detuning via a serial tuned DC Voltage-controlled Variable Capacitor (DVVC). The equivalent capacitance of the DVVC changes with the conduction period of a diode in the DVVC controlled by DC voltage. The output voltage of an IPT system can be made constant when this DVVC is used as a variable resonant capacitor combined with a PI controller generating DC control voltage according to the fluctuations of the output voltage. Since a passive diode instead of an active switch is used in the DVVC, there are no active switch driving problems such as a separate voltage source or gate drivers, which makes the DVVC especially advantageous when used at the secondary side of an IPT system. Moreover, since the equivalent capacitance of the DVVC can be controlled smoothly with a DC voltage and the passive diode generates less EMI than active switches, the DVVC has the potential to be used at much higher frequencies than traditional switch mode capacitors.

Unscented Kalman Filter를 이용한 원격 RF 센서 시스템 구현 (Implementation of Passive Telemetry RF Sensor System Using Unscented Kalman Filter Algorithm)

  • 김경엽;이준탁
    • 전기학회논문지
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    • 제57권10호
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    • pp.1861-1868
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    • 2008
  • In this paper, Passive Telemerty RF Sensor System using Unscented Kalman Filter algorithm(UKF) is proposed. General Passive Telemerty RF Sensor System means that it should be "wireless", "implantable" and "batterless". Conventional Passive Telemerty RF Sensor System adopts Integrated Circuit type, but there are defects like complexity of structure and limit of large power consumption in some cases. In order to overcome these kinds of faults, Passive Telemetry RF Sensor System based on inductive coupling principle is proposed in this paper. Because passive components R, L, C have stray parameters in the range of high frequency such as about 200[KHz] used in this paper, Passive Telemetry RF Sensor System considering stray parameters has to be derived for accurate model identification. Proposed Passive Telemetry RF Sensor System is simple because it consists of R, L and C and measures the change of environment like pressure and humidity in the type of capacitive value. This system adopted UKF algorithm for estimation of this capacitive parameter included in nonlinear system like Passive Telemetry RF Sensor System. For the purpose of obtaining learning data pairs for UKF Algorithm, Phase Difference Detector and Amplitude Detector are proposed respectively which make it possible to get amplitude and phase between input and output voltage. Finally, it is verified that capacitive parameter of proposed Passive Telemetry RF Sensor System using UKF algorithm can be estimated in noisy environment efficiently.

유도 결합형 Inverter와 Metamaterial을 이용한 넓은 저지 대역을 갖는 소형 GSM 대역 통과 여파기의 설계 (Design of the Miniaturaized UHF Bandpass Filter with the Wide Stopband Using the Inductive-Coupling Inverters and Metamaterials)

  • 주정호;강승택
    • 한국전자파학회논문지
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    • 제19권2호
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    • pp.95-101
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    • 2008
  • 본 논문은, '불균형 조건의 메타 재질 구조'를 이용하여 GSM 대역에서 불요파 억제와 효과적인 소형화를 얻는 새로운 대역 통과 여파기 설계 기법을 제시한다. 기존의 반파장 및 025배 파장 공진기 기반의 여파기들과 비교하여, 본 CRLH 여파기는 처음으로 제안되는 유도성 결합 inverter에 의해 0차 공진기들이 결합되고, 이것을 사용함으로써 40$\sim$50 dB 하모닉 억제 효과와 80 %율의 소형화 얻는데 위한 우수한 성능을 보여준다. 이 기법의 타당성이 등가 회로와 분산도의 도출과 함께 성능 예측과 실험을 통해 검증된다.

3차원 프린팅을 이용한 무선전력전송의 안테나 설계 특성 규명 (Effect of 3D Printed Spiral Antenna Design on Inductive Coupling Wireless Power Transmission System)

  • 김지성;박민규;이호;김지언
    • 한국기계가공학회지
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    • 제19권8호
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    • pp.73-80
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    • 2020
  • The 3D printing of electronics has been a major application topics in additive manufacturing technology for a decade. In this paper, wireless power transfer (WPT) technology for 3D electronics is studied to supply electric power to its inner circuit. The principle of WPT is that electric power is induced at the recipient antenna coil under an alternating magnetic field. Importantly, the efficiency of WPT does rely on the design of the antenna coil shape. In 3D printed electronics, a flat antenna that can be placed on the printed plane within a layer of a 3D printed part is used, but provided a different antenna response compared to that of a conventional PCB antenna for NFC. This paper investigates the WPT response characteristics of a WPT antenna for 3D printed electronics associated with changes in its design elements. The effects of changing the antenna curvature and the gap between the wires were analyzed through experimental tests.

RLS 알고리즘을 이용한 원격 RF 센서 시스템의 정전용량 파라메타 추정 (Capacitive Parameter Estimation of Passive Telemetry RF Sensor System Using RLS Algorithm)

  • 김경엽;이준탁
    • 전기학회논문지
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    • 제57권5호
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    • pp.858-865
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    • 2008
  • In this paper, Capacitive Telemetry RF Sensor System using Recursive Least Square (RLS) algorithm was proposed. General Telemetry RF Sensor System means that it should be "wireless", "implantable" and "batterless". Conventional Telemetry RF Sensor System adopts Integrated Circuit type, but there are many defects like complexity of structure and the limitation of large power consumption in some cases. In order to overcome these disadvantages, Telemetry RF Sensor System based on inductive coupling principle was proposed in this paper. Proposed Telemetry RF Sensor System is very simple because it consists of R, L and C and measures the changes of environment like pressure and humidity in the type of capacitive value. This system adopted RLS algorithm for estimation of this capacitive parameter. For the purpose of applying RLS algorithm, proposed system was mathematically modelled with phasor method and was quasi-linearized. As two parameters such as phase and amplitude of output voltage for estimation were needed, Phase Difference Detector and Amplitude Detector were proposed respectively which were implemented using TMS320C2812 made by Texas Instrument. Finally, It is verified that the capacitance of proposed telemetry RF Sensor System using RLS algorithm can be estimated efficiently under noisy environment.