• Title/Summary/Keyword: Leakage inductance

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Bi-polar High-voltage Pulse Generator Using Semiconductor switches (반도체 스위치를 이용한 양방향 고압 펄스 발생기)

  • Kim J.H.;Ryu M.Y.;Jung I.W.;Shenderey S.;Kim J.S.;Rim G.H.
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.291-293
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    • 2003
  • A semiconductor switch-based fast hi-polar high voltage pulse generator is proposed in this paper The proposed pulse system is made of a thyristor based-rectifier, DC link capacitor, a push-pull resonant inverter, a high voltage transformer. secondary capacitor, a high voltage IGBT & diode stacks, and a variable capacitor. The proposed system makes hi-polar high voltage sinusoidal waveform using resonance between leakage inductance of the transformer and secondary capacitor and transfers energy to output load at maximum of the secondary capacitor voltage. Compared to previous hi-polar high voltage pulse power supply using nonlinear transmission line, the proposed pulse power system using only semiconductor switches has simple structure and gives high efficiency

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A Single Stage Boost Input Type Resonant AC-DC Converter with High Power Factor (고역률의 단일단 부스트 입력방식의 공진형 AC-DC 컨버터)

  • Yeon J.E.;Jeong J.B.;Kim H.J,
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.66-68
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    • 2003
  • This paper proposes the single stage boost input type resonant AC-DC converter. Proposed converter uses the resonance between leakage inductance of the transformer and resonance capacitance. And it obtains high power factor more than 98$\%$ through continuous current mode pulse width modulation. To verify the validity of the proposed converter, operation principle In the steady state is analyzed and experimental results are presented.

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A high voltage resonant genrator for X-ray apparatus (X-선 발생기기용 공진형 고전압 발생기)

  • 김학성;원충연
    • Journal of the Korean Institute of Telematics and Electronics B
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    • v.33B no.4
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    • pp.217-225
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    • 1996
  • This paper describes a high power resonant inverter for diagnostic X-ray generators using zero-voltage soft-switching technology. The system consists of a step-down chopper, a resonant phase-shift PWM inverter, a hihg-voltage diode, and high voltage cables a smoothing DC capacitor. The inverter makes use the leakage inductance of the hihg-voltage transformer and external capacitor as resonant components. The rectified input voltage is controlled by a step-down chopper with input voltage compensator. The output regualtion is obtained by a resonant phase-shift PWM inverter with the digital feedback controller using DSP (digital signal processor), resulting in fast rising time and wide output voltage variation. The theoretical results are correlated with results from an experimental prototype of a 7-kVp, 300mA (21kW).

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PWM current source converter and inverter system for induction motor drives (유도전동기 구동을 위한 전류형 PWM 컨버터 및 인버터 시스템)

  • 이동춘
    • Journal of the Korean Institute of Telematics and Electronics B
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    • v.33B no.5
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    • pp.159-164
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    • 1996
  • In this paper, a novel control strategy of curretn source PWM converter and inverter system for induction motor dirves is proposed. The PWM converter controls line current to be sinusoidal and makes input power factor unity. In the inverter part, a minor voltage control loop is incorporated in the current control looop in order to suppress unstale resonance between the filter capacitor and the motor leakage inductance and to keep the stator voltage under the rated value. In additon, the modulation index control of the inverter currents ripples and inverter loss. With the proposed algorithm, both high dynamic responses and satisfactory static performance can be obtained.

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The Parameter Compensation Technique of Induction Motor by Neural Network (신경회로망을 이용한 유도전동기의 파라미터 보상)

  • Kim Jong-Su;Oh Sae-Gin;Kim Sung-Hwan
    • Journal of Advanced Marine Engineering and Technology
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    • v.30 no.1
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    • pp.169-175
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    • 2006
  • This paper describes how an Artificial Neural Network(ANN) can be employed to improve a speed estimation in a vector controlled induction motor drive. The system uses the ANN to estimate changes in the motor resistance, which enable the sensorless speed control method to work more accurately. Flux Observer is used for speed estimation in this system. Obviously the accuracy of the speed control of motor is dependent upon how well the parameters of the induction machine are known. These parameters vary with the operating conditions of the motor; both stator resistance(Rs) and rotor resistance(Rr) change with temperature, while the stator leakage inductance varies with load. This paper proposes a parameter compensation technique using artificial neural network for accurate speed estimation of induction motor and simulation results confirm the validity of the proposed scheme.

A Study on the Load Commutated Current Source Inverter assisted with A GTO-DC Source Forced Commutation (GTO-직류전원을 병용한 부하전류(轉流)식 전류형 인버터에 관한 연구)

  • Mok, Hyung-Soo;Sul, Seung-Ki
    • Proceedings of the KIEE Conference
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    • 1991.07a
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    • pp.591-595
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    • 1991
  • The load commutated current source inverter(LCCSI) with GTO-DC source forced commutation is described in this Paper. GTO-DC source forced commutation assures the stability of commutation below critical frequency determined by output capcaitor and it also gives the oppotunity of PWM operation for reducing resonant harmonic components. he simulation results clearly show hat the proposed commutation circuit works well in the resonance phenomenon between output capacitor and machine leakage inductance.

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A Study on the Development of A 13kW High Frequency ZVS FB DC-DC Converter (13kW급 고주파 ZVS FB DC-DC 콘버터 개발)

  • Kim, Eun-Soo;Joe, Kee-Yeon;Lee, Jae-Hun
    • Proceedings of the KIEE Conference
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    • 1994.07a
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    • pp.542-546
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    • 1994
  • The objective of the study is to design and develope a 13kW zero voltage switching DC-DC Converter far high power application. Due to using the snubber capacitor in the right leg instead of increasing transformer leakage inductance, DC characteristics and the total efficiency in the proposed ZVS DC-DC converter is increased mere than in the conventional ZVS DC-DC converter by reduction of the circulating current when the load current is large. Also, this paper includes simulation and experimental results of the proposed ZVS FB DC-DC converter.

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New Loss Minimization Vector Control for Induction Motors (새로운 유도전동기 손실 최소화 벡터제어)

  • Lee, Hong-Hee;Khojakhan, Yerganat
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.6
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    • pp.1140-1145
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    • 2011
  • This paper proposes a new loss minimization control method for the vector controlled induction motors. The aim of the proposed loss minimization method is how to determine the optimal flux reference to minimize the total loss of induction motor. Even though the proposed algorithm is based on the equivalent circuit of induction motor including iron loss and leakage inductance, the algorithm is easy to be found and simple to be implemented. Futhermore, the proposed loss minimization algorithm can be applied easily to the traditional vector control system without any additional hardware. Simulation and experimental results are given to validate the effectiveness of the proposed method.

Analysis on Parameter Detuning of Induction Motor Drives in Constant Torque Region (일정토크영역에서 유도전동기 고정자자속기준제어의 파라미터 비동조 영향 분석)

  • Shin, Myoung-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.11
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    • pp.81-86
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    • 2012
  • It is well known that the stator-flux-oriented induction motor drives are not dependent on parameter detuning in constant torque region except low speed range. This paper presents parameter detuning effects of stator-flux-oriented induction motor drives in constant torque region. The detuning effects of stator resistance, rotor resistance and rotor leakage inductance are analyzed.

A study on the micro inductor using LTCC technology (LTCC기술을 이용한 마이크로 인덕터에 관한 연구)

  • Choi, Dong-Chan;Kim, Chan-Young;Kim, Hee-Jun
    • Proceedings of the KIEE Conference
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    • 2003.04a
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    • pp.289-291
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    • 2003
  • This paper deals with the design of a spiral micro inductor using LTCC(Low Temperature Cofired Ceramics) technology. The inductors using the LTCC technology have some prominent properties of high integration of circuits, high confidence and low cost comparing with previously fabricated thick-film inductors. In this paper, we designed a new spiral-type micro inductor comprising a magnetic material to improve the inductance and leakage flux. we, in addition, presented the simulation results for various shapes of the magnetic material in the micro inductor, Finally application of the micro inductor to the boost DC-DC converter is investigated.

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