• 제목/요약/키워드: Voltage overshoot

검색결과 118건 처리시간 0.026초

전력용 IGBT의 시뮬레이션과 과도 해석 (Simulation of Power IGBT and Transient Analysis)

  • 서영수
    • 한국시뮬레이션학회논문지
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    • 제4권2호
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    • pp.41-60
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    • 1995
  • The IGBT(Insulated Gate Bipolar Transistor) is a power semiconductor device that has gained acceptance among circuit design engineers for motor drive and power converter applications. IGBT devices(International Rectifier, Proposed proposed model etc) have the best features of both power MOSFETs and power bipolar transistors, i.e., efficient voltage gate drive requirememts and high current density capability. When designing circuit and systems that utilize IGBTs or other power semiconductor devices, circuit simulations are needed to examine how the devices affect the behavior of the circuit. The interaction of the IGBT with the load circuit can be described using the device model and the state equation of the load circuit. The voltage rise rate at turn-off for inductive loads varies significantly for IGBTs with different base life times, and this rate of rise is important in determing the voltage overshoot for a given series resistor-inductor load circuit. Excessive voltage overshoot is potentially destructive, so a snubber protection circuit may be required. The protection circuit requirements are unique for the IGBT and can be examined using the model. The IGBT model in this paper is verified by comparing the results of the model with experimented results for various circuit operating conditions. The model performs well and describes experimented results accurately for the range of static and dynamic condition in which the device is intended to be operated.

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SiC Based Single Chip Programmable AC to DC Power Converter

  • Pratap, Rajendra;Agarwal, Vineeta;Ravindra, Kumar Singh
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제14권6호
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    • pp.697-705
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    • 2014
  • A single chip Programmable AC to DC Power Converter, consisting of wide band gap SiC MOSFET and SiC diodes, has been proposed which converts high frequency ac voltage to a conditioned dc output voltage at user defined given power level. The converter has high conversion efficiency because of negligible reverse recovery current in SiC diode and SiC MOSFET. High frequency operation reduces the need of bigger size inductor. Lead inductors are enough to maintain current continuity. A complete electrical analysis, die area estimation and thermal analysis of the converter has been presented. It has been found that settling time and peak overshoot voltage across the device has reduced significantly when SiC devices are used with respect to Si devices. Reduction in peak overshoot also increases the converter efficiency. The total package substrate dimension of the converter circuit is only $5mm{\times}5mm$. Thermal analysis performed in the paper shows that these devices would be very useful for use as miniaturized power converters for load currents of up to 5-7 amp, keeping the package thermal conductivity limitation in mind. The converter is ideal for voltage requirements for sub-5 V level power supplies for high temperatures and space electronics systems.

Novel Driving Method for fast Response Time in Vertical Alignment LCDs

  • Song, Jang-Kun;Jun, Man-Bok;Park, Bo-Yoon;Seomun, San-Seong;Lee, Kye-Hun;Choi, Kwang-Soo;Kim, Sang-Soo
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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    • pp.205-208
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    • 2004
  • The switching mechanism of multi-domain vertical alignment mode LCD and delayed on response time phenomenon in special conditions are investigated. A modified DCC (Dynamic Capacitance Compensation), DCCII has been developed for the fast response time performance in PVA TFT-LCD TVs. DCCII applies a pre-tilt voltage to addressed pixels during the previous frame in addition to an overshoot voltage. In result, the response time less than 8 msec, has been obtained for all moving images through the DCCII technique.

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Load Transient Detection 구조 및 개선된 과도응답 특성을 갖는 LDO regulator (LDO Regulator with Improved Transient Response Characteristics and Load Transient Detection Structure)

  • 박태룡
    • 전기전자학회논문지
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    • 제26권1호
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    • pp.124-128
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    • 2022
  • 기존 LDO 레귤레이터 외부 커패시터는 오버슈트 및 언더슈트와 같은 과도 응답 특성을 줄일 수 있다. 그러나 본 연구에서 제안한 Capless LDO 레귤레이터는 과도 응답을 개선하고 우수한 전류 구동 능력을 제공하기 위해 패스 트랜지스터에 바디 기술을 적용하였다. 제안하는 LDO 레귤레이터의 동작 조건은 3.3V ~ 4.5V 범위의 입력 전압, 최대 부하 전류 200mA, 출력 전압 3V로 설정하였다. 측정 결과, 부하 전류가 100mA일 때 전압은 언더슈트 상태에서 95 mV, 오버슈트 상태에서 105 mV임을 확인 할 수 있었다.

공진형 직류 링크 인버터의 공진 펄스 제어기 (A novel resonant pulse control in resonant DC link inverter)

  • 유동욱;원충연
    • 전자공학회논문지B
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    • 제33B권5호
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    • pp.152-158
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    • 1996
  • A novel resonant pulse control technique which generates high-quality sinusoidal output voltage from a resonant dc link inverter is presented for UPS applicatons. The proposed control technique limits resonant voltae overshoot without any passive or active clamp circuit, resulting in resonant pulses iwth uniform amplitude and high efficiency. The output voltage is controlled by the third order contorller iwth an inner loop of th efilter inductor current and the feedforward controller. Analysis and design of the proposed control technique are illustrated and verified on a 5kVA experimental unit.

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유사공진형 SMPS의 보상기 설계에 관한 연구 (A study on the compensator design of the quasi-resonant SMPS)

  • 임일선;허욱열
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1991년도 하계학술대회 논문집
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    • pp.720-725
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    • 1991
  • In this thesis, the lead-lag compensator is designed to improve output characteristics of flyback zero voltage switching quasi-resonant converters. The switch and the diode are assumed ideally. And the SMPS is modelled by state equations with four operation modes. And the model for controller design is also achived by using a state space averaging method, which is continuous time average of state variables every period. The lag, the lead and the lead-lag compensator is designed the SMPS respectively. The time domain analysis and the frequency domain analysis are done for each compensated circuit. It is possible increasing the phase margin and improving the transient response by the compensators. The phase lag compensator has small overshoot comparatively. But the bandwidth is narrower than the others, so it has longest settling time. For the phase lead compensator, the response come to steady-state within short period. But the overshoot is the largest due to its large peak gain. Finally, the phase lead-lag compensator has medium characteristics in the overshoot and the settling time.

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Push-Pull 패스 트랜지스터 구조 및 향상된 Load Transient 특성을 갖는 LDO 레귤레이터 (A Low Drop Out Regulator with Improved Load Transient Characteristics and Push-Pull Pass Transistor Structure)

  • 권상욱;송보배;구용서
    • 전기전자학회논문지
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    • 제24권2호
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    • pp.598-603
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    • 2020
  • 본 논문에서는 Push-Pull 패스 트랜지스터 구조로 인하여 향상된 Load Transient 특성을 향상시킨 LDO(Low Drop-Out)를 제안하였다. LDO 레귤레이터 내부의 오차증폭기의 출력단과 패스 트랜지스터의 게이트단 사이에 제안된 Push-Pull 회로와 출력단에 Push-Pull 회로를 추가하여 전압 라인에 들어오는 Overshoot, Undershoot를 개선시켜 기존의 LDO 레귤레이터보다 개선된 Load Transient 특성의 델타 피크 전압 값을 갖는다. 제안하는 회로는 Cadence의 Virtuoso, Spectre 시뮬레이션을 이용하여 삼성 0.13um 공정에서 특성을 분석하였다.

Sub-0.1㎛ MOSFET의 게이트전압 종속 캐리어 속도를 위한 정확한 RF 추출 방법 (Accurate RF Extraction Method for Gate Voltage-Dependent Carrier Velocity of Sub-0.1㎛ MOSFETs in the Saturation Region)

  • 이성현
    • 전자공학회논문지
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    • 제50권9호
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    • pp.55-59
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    • 2013
  • Sub-$0.1{\mu}m$로 스케일이 감소함에 따라 기생 저항 효과가 크게 발생되는 dc Ids 측정 데이터 없이 측정 S-파라미터로부터 얻어진 RF Ids를 사용하여 벌크 MOSFET의 포화영역에서 게이트 전압 종속 유효 캐리어 속도를 추출하는 새로운 방법이 개발되었다. 이 방법은 바이어스 종속 기생 게이트-소스 캐패시턴스와 유효 채널 길이의 복잡한 추출 없이 포화영역의 유효 캐리어 속도를 추출할 수 있게 한다. 이러한 RF 기술을 사용하여 벌크 포화 속도를 초과하는 전자 속도 overshoot 현상이 $0.065{\mu}m$ 게이트 길이의 벌크 N-MOSFET에서 관찰되었다.

Amplidyne의 포화현상을 고려한 직류정전압계통의 과도응답 해석 (Transient Response Analysis of DC Voltage Regulating System with Amplidyne Saturation Effect)

  • 이승원;김남호
    • 전기의세계
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    • 제26권6호
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    • pp.55-58
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    • 1977
  • This paper deals with the transient analysis of an amplidyne dc voltage regulating system under the following conditions: (1) assuming all the components of the system to be linear, (2) considering the effect of amplidyne saturation. The mathematical technique employed is state variables method. The calculated response curves are compared with the experimental results obtained on a practical system. The main results can be summerized as follows: 1) The effect of amplidyne saturation on the transient response of a dc voltage regulating system is to reduce the overshoot and setting time. 2) With the increase in level of the step reference voltage, the system response becomes apesiodic. 3) The steady output voltage is reduced appreciably compared to the linear case.

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영구자석 여자기형 발전기의 전압변동 억제 제어방식 (Permanent magnet excitation generator Voltage fluctuation suppression control method)

  • 조영준;곽윤창;이동희
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2017년도 전력전자학술대회
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    • pp.74-75
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    • 2017
  • This paper proposes a control scheme of the voltage ripple suppression for the permanent magnet exciter generator. The output voltage of the permanent magnet excitation generator is affected by the field current, load current and the engine speed. The engine speed can be controlled by the governor. But, the actual frequency is changed at the starting and a sudden load variation. As a result, output voltage overshoot and undershoot can decrease the power quality in the grid system. The proposed control scheme uses a frequency factor to control the field current of the generator for the voltage ripple reduction. Because of the linkage flux is proportional to the frequency, the instantaneous frequency can consider the linkage flux. The proposed control method shows the improved control performance for the permanent magnet excitation generator through simulation.

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