• 제목/요약/키워드: Capacitance design

검색결과 531건 처리시간 0.042초

Marx 펄스발생기를 응용한 소형 고전압 급준 펄스 발생장치 (Fast Rise Time High Voltage Pulse Generator Applying The Marx Generator)

  • 박승록;정석환;김진규;문재덕
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제50권2호
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    • pp.72-78
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    • 2001
  • A compact size high voltage pulse generator with nanosecond rise time has been designed and investigated experimentally. The inductance of a pulse generator can be reduced by fixing the Marx generator and pulse forming network components into a single cylindrical unit. As a result, nanosecond rise time about $8{\sim}10[ns]$ and pulse width of several hundred [ns] can be obtained from a modified Marx pulse generator. And parametric studies showed that the rise time of the output pulse was depended little on the change of the load resistance and the charging capacitance while, the pulse width of the output pulse was depended greatly upon the change of the load resistance and the charging capacitance. The theoretical showed the possibility to design the laboratory-size pulse generator very fast rising time and a proper pulse width by minimizing stray inductance and varying resistance and capacitance.

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3권선형 능동 전력 디커플링 기법을 적용한 플라이백 인버터의 입력 커패시턴스 분석 (Input Capacitance Analysis of Three-port Flyback Inverter with Active Power Decoupling Circuit)

  • 오민석;김규동;김준구;이태원;정용채;원충연
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2012년도 추계학술대회 논문집
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    • pp.137-138
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    • 2012
  • In this paper, three-port flyback inverter with Active Power Decoupling(APD) circuit is analyzed. Conventional flyback inverter with passive power decoupling circuit needs the electrolytic capacitor with large capacitance for decoupling between constant DC power and instantaneous AC power. However the electrolytic capacitor has low lifespan about 50000 to 100000 hours. So the active power decoupling techniques are applied to reduce input capacitance of flyback inverter. Thus the overall system can achieve smaller size and longer lifespan. Proposed three-port flyback inverter is verified by design optimization, simulation and experimental result.

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Touch Screen Panel by using Liquid Crystal Capacitance Variation embedded in LTPS AMLCD

  • Lee, Woo-Cheul;Ha, Tae-Jun;Park, Hyun-Sang;Lee, Jeong-Soo;Han, Min-Koo
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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    • pp.302-305
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    • 2008
  • We present a new touch screen method, which utilizes the variation of liquid crystal capacitance according to the touch event on the screen. It is integrated in the AMLCD with the conventional LTPS process. Its resolution is same as the display resolution as well as performs the multi-touch sensing function basically. The design concept and the operation are verified with the SPICE simulation.

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CIO capacitance가 작은 analog ZQ calibration 의 설계 (A design of analog ZQ calibration with small CIO capacitance)

  • 박경수;최재웅;채명준;김지웅;곽계달
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2008년도 하계종합학술대회
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    • pp.577-578
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    • 2008
  • This paper proposes new analog ZQ calibration scheme. Proposed analog ZQ calibration scheme is for minimizing the reflection which degrade the signal integrity. And this scheme is for minimizing CIO capacitance. It is simulated under 1.5v supply voltage and samsung 0.18um process. Power consumption of proposed analog ZQ calibration circuit was improved by 32%. Under all skew, temperature from $30^{\circ}C$ to $90^{\circ}C$ and Monte carlo simulation, quantization error of RZQ(=$240{\Omega}$) is less han 1.07%.

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GaAs 버렉터 다이오드의 설계와 제작에 관한 연구 (Study of Design and Fabrication of GaAs Varactor diode)

  • 최석규;백용현;백태종;김미라;이진구
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2008년도 하계종합학술대회
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    • pp.387-388
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    • 2008
  • In this paper, we have designed and fabricated hyperabrupt varactor diodes. Capacitance variations of hyperabrupt-doped varactor diodes are larger than those of uniform-doped varactor diodes. The measured reverse breakdown voltage of the fabricated varactor diodes was about 20 V. For the anode contact diameter of $50\;{\mu}m$, the maximum capacitance of the fabricated varactor diode was 2.1 pF and the minimum capacitance 0.44 pF. Therefore, the $C_{max}/C_{min}$ ratio was 4.77. Also, for the anode contact diameter of $60\;{\mu}m$, the maximum and minimum capacitances were 2.9 and 0.62 pF, respectively. And, thus, the $C_{max}/C_{min}$ ratio was 4.64.

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Design of Voltage Controlled Oscillator using Miller Effect

  • Choi Moon-Ho;Kim Yeong-Seuk
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2004년도 ICEIC The International Conference on Electronics Informations and Communications
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    • pp.218-220
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    • 2004
  • A new wide-band VCO topology using Miller capacitance is proposed. Contrary to conventional VCO using the Miller capacitance where the variable amplifier gain is negative, the proposed VCO uses both the negative and positive variable amplifier gain to enhance the frequency tuning range significantly. The proposed VCO is simulated using HSPICE. The simulations show that 410MHz and 220MHz frequency tuning range are obtained using the negative .and positive variable amplifier gain, respectively. The tuning range of the proposed VCO is $23\%$ of the center frequency(2.8GHz). The phase noise is -104dBc/Hz at 1MHz offset by simple model. The operating current is only 3.84mA at 2.5V power supply.

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Optimization Shape of Variable-Capacitance Micromotor Using Seeker Optimization Algorithm

  • Ketabi, Abbas;Navardi, Mohammad Javad
    • Journal of Electrical Engineering and Technology
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    • 제7권2호
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    • pp.212-220
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    • 2012
  • In the current paper, the optimization shape of a polysilicon variable-capacitance micromotor (VCM) was determined using the seeker optimization algorithm (SOA). The optimum goal of the algorithm was to find the maximum torque value and minimum ripple torque by varying the geometrical parameters. The optimization process was performed using a combination of SOA and the finite-element method (FEM). The fitness value was calculated via FEM analysis using COMSOL3.4, and SOA was realized by MATLAB7.4. The proposed method was applied to a VCM with eight and six poles at the stator and rotor, respectively. For comparison, this optimization was also performed using the genetic algorithm. The results show that the optimized micromotor using SOA had a higher torque value and lower torque ripple, indicating the validity of this methodology for VCM design.

MMC 기반 HVDC 시스템용 서브모듈 시험회로의 커패시터 용량 분석 (Capacitance Value Analysis of Sub-module Test Circuit for MMC-based HVDC System)

  • 서병준;박권식;조광래;노의철;김흥근;전태원;김태진;이종필
    • 전력전자학회논문지
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    • 제23권6호
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    • pp.433-439
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    • 2018
  • This study considers the design of a submodule test circuit for the modular multi-level converter (MMC)-based HVDC systems. A novel submodule test circuit is proposed to provide not only an AC but also a DC component to the submodule current. However, the current waveforms depend on the capacitor voltages. Therefore, determining the capacitance value of the test circuit is important. Finding a proper capacitance value is easy when the proposed analysis method is used. Simulation and experimental results show the usefulness of the proposed method.

K-PCS와 W-CDMA 듀얼밴드용 유전체 듀플렉서와 밴드패스 필터의 설계 및 제작 (Design and Fabrication of Dielectric Duplexer and Bandpass Filters for K-PCS and W-CDMA Dualband)

  • 최우성;양성현;김철주;문옥식
    • 한국전기전자재료학회논문지
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    • 제25권12호
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    • pp.949-954
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    • 2012
  • The K-PCS and W-CDMA dual band dielectric duplexer and bandpass filters have been designed and fabricated. The dual band duplexer consists of the separate monoblock K-PCS and W-CDMA duplexers using common antenna port. The coupling capacitance and I/O impedance matching have been designed to minimize the cross interference between the bands. Isolations of crosspoint between Tx and Rx in K-PCS and W-CDMA dualband were about 47 dB and 100 dB, respectively. On the other hand, isolations of Tx and Rx in K-PCS and W-CDMA were about 66 dB and 65 dB, respectively. The difference between 47 dB and 100 dB originated from the different center frequencies in Tx and Rx of K-PCS and W-CDMA bands. The coupling capacitance of the bandwidth, I/O capacitance of I/O matching and impedance matching, and various capacitances were important role to fabricate the dielectric duplexer and bandpass filters.

Detecting and predicting the crude oil type inside composite pipes using ECS and ANN

  • Altabey, Wael A.
    • Structural Monitoring and Maintenance
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    • 제3권4호
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    • pp.377-393
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    • 2016
  • The present work develops an expert system for detecting and predicting the crude oil types and properties at normal temperature ${\theta}=25^{\circ}C$, by evaluating the dielectric properties of the fluid transfused inside glass fiber reinforced epoxy (GFRE) composite pipelines, by using electrical capacitance sensor (ECS) technique, then used the data measurements from ECS to predict the types of the other crude oil transfused inside the pipeline, by designing an efficient artificial neural network (ANN) architecture. The variation in the dielectric signatures are employed to design an electrical capacitance sensor (ECS) with high sensitivity to detect such problem. ECS consists of 12 electrodes mounted on the outer surface of the pipe. A finite element (FE) simulation model is developed to measure the capacitance values and node potential distribution of ECS electrodes by ANSYS and MATLAB, which are combined to simulate sensor characteristic. Radial Basis neural network (RBNN), structure is applied, trained and tested to predict the finite element (FE) results of crude oil types transfused inside (GFRE) pipe under room temperature using MATLAB neural network toolbox. The FE results are in excellent agreement with an RBNN results, thus validating the accuracy and reliability of the proposed technique.