• Title/Summary/Keyword: variable voltage measurement

Search Result 47, Processing Time 0.038 seconds

Design and Implementation of High Power Source Measurement Unit (고 전력 Source Measurement Unit의 설계 및 제작)

  • Lee, Sang-Gu;Baek, Wang-Gi;Park, Jong-Sik
    • Proceedings of the KIEE Conference
    • /
    • 2003.11c
    • /
    • pp.860-863
    • /
    • 2003
  • In this paper high power SMU(Source Measurement Unit) having 50V/1.5A source/measure range has been designed and implemented. The SMU has two operation mode, voltage mode and current mode. The SMU can be used as variable voltage source, variable current source, voltage meter, or current meter. Combining two different unit, output power can be doubled as 100V/1.5A. The developed SMU tan be used many semiconductor testing system and electronic device inspecting system.

  • PDF

3-Phase RMS Voltage Measurement Method of Virtual Frequence using Instantaneous Power Component Concept (순시전력 합성 개념을 이용한 가상주파수 3상 실효전압 계측기법)

  • Park, Seong-Mi;Yang, Ji-Hoon;Park, Sung-Jun
    • Journal of the Korean Society of Industry Convergence
    • /
    • v.22 no.3
    • /
    • pp.251-257
    • /
    • 2019
  • This paper proposes a new measurement method using virtual power concept to measure the effective value of 3-phase voltage with variable frequency. The conventional effective value measurement method uses a method of integrating data sampled during one or half cycle of the power voltage and averaging it. In this method, since the effective voltage is calculated every cycle, a time delay occurs in the measured effective voltage and it is s a problem to measure the effective value of a device whose frequency varies from time to time, such as a generator. The proposed 3-phase voltage rms measurement method has an advantage that it can measure accurate voltage RMS value regardless of measurement frequency variation. In particular, there is an advantage in that it is possible to measure a 3-phase effective voltage rather than an average value of the effective voltage of each phase in a 3-phase unbalance voltage. In addition, the validity of the proposed method is verified by using the Psim simulation tool and the experimental results are analyzed by applying the proposed measurement algorithm to the actual three phase synchronous generator voltage measurement experiment.

A Study On Hardware Design for High Speed High Precision Neutron Measurement (고속 고정밀 중성자 측정을 위한 하드웨어 설계에 관한 연구)

  • Jang, Kyeong-Uk;Lee, Joo-Hyun;Lee, Seung-Ho
    • Journal of IKEEE
    • /
    • v.20 no.1
    • /
    • pp.61-67
    • /
    • 2016
  • In this paper, a hardware design method is proposed for high speed high precision neutron radiation measurements. Our system is fabricated to use a high performance A/D Converter for digital data conversion of high precision and high speed analog signals. Using a neutron sensor, incident neutron radiation particles are detected; a precision microcurrent measurement module is also included: this module allows for more precise and rapid neutron radiation measurement design. The high speed high precision neutron measurement hardware system is composed of the neutron sensor, variable high voltage generator, microcurrent precision measurement component, embedded system, and display screen. The neutron sensor detects neutron radiation using high density polyethylene. The variable high voltage generator functions as a 0 ~ 2KV variable high voltage generator that is robust against heat and noise; this generator allows the neutron sensor to perform normally. The microcurrent precision measurement component employs a high performance A/D Converter to precisely and swiftly measure the high precision high speed microcurrent signal from the neutron sensor and to convert this analog signal into a digital one. The embedded system component performs multiple functions including neutron radiation measurement for high speed high precision neutron measurements, variable high voltage generator control, wired and wireless communications control, and data recording. Experiments using the proposed high speed high precision neutron measurement hardware shows that the hardware exhibits superior performance compared to that of conventional equipment with regard to measurement uncertainty, neutron measurement rate, accuracy, and neutron measurement range.

The Improvement of Accuracy and Measurement Speed in the Low Current Measurement System (저전류 측정 시스템에서의 정밀도 및 측정 속도 향상)

  • Baek, Wang-Ki;Choi, In-Kyu;Park, Jong-Sik;Lee, Kyung-Ho
    • Proceedings of the KIEE Conference
    • /
    • 2002.11c
    • /
    • pp.550-553
    • /
    • 2002
  • A source meter is a basic instrument to perform a measurement of DC characteristic of semiconductor devices. the source meter can be used as variable voltage source, variable current source, voltage meter, or current meter. The accuracy of the low current measurement can be improved with the compensation of leakage current and charge and discharge current. In the low current measurement, the RC time constant is extremely big, so the measurement speed is very low. In this thesis, the analysis of the behavior of the measurement current according to the RC time constant and output capacitance and the method to accelerate the measurement speed.

  • PDF

Development of Variable Voltage Sensing for Identification of Dynamic Characteristics of TLCDs (동조액체기둥감쇠기의 동적특성을 파악하기 위한 가변전압측정 시스템 개발)

  • Jang, Seok-Jung;Kim, Jun-Hee;Min, Kyung-Won
    • Journal of the Computational Structural Engineering Institute of Korea
    • /
    • v.28 no.3
    • /
    • pp.275-281
    • /
    • 2015
  • In this study, vertical motion of a Tuned Liquid Column Damper(TLCD) is measured by a variable voltage measurement system in the electric field and design parameters of the TLCD are determined. First, nonlinear damping term of the TLCD is replaced as the equivalent viscous damping term. The natural frequency and damping ratio of dynamic characteristics of the TLCD are verified. In addition, a novel liquid level measurement system is developed for measuring vertical motion of the TLCD. For the experimental achievement, experimental characterizations of natural frequency and damping ratio of the TLCD are undertaken utilizing the developed variable voltage sensing. Also, shake table testing is performed to determine the dynamic characteristics of the TLCD. As a result, the feasibility of the proposed liquid level measurement system is verified by comparison with the capacitive type wavemeter.

An Alternating Motion Technique Using Linear Variable Differential Transformers (선형변이 차동변압기를 이용한 왕복운동 계측기법)

  • 최주호;김윤겸
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 1996.11a
    • /
    • pp.1073-1077
    • /
    • 1996
  • This paper presents a recoil and counter recoil(R&CR) motion measurement method using linear variable differential transformers(LVDT). The output of a LVDT is obtained from the differential voltage of the 2nd transformers. As a sensor core is attached at the motion body, the output is directly proportional to the core motion. Displacement, velocity and acceleration are measure from the core length. With a comparison between the measurement result and the known value which is obtained by the precision steel tape, the accuracy and the usefulness of the proposed scheme is validated.

  • PDF

Ultra-fast Adaptive Frequency-controlled Hysteretic Buck Converter for Portable Devices

  • Kim, Kwang-Ho;Kong, Bai-Sun
    • JSTS:Journal of Semiconductor Technology and Science
    • /
    • v.16 no.5
    • /
    • pp.615-623
    • /
    • 2016
  • The paper describes a hysteretic buck converter including a differentiator and an adaptive hysteresis window controller. Differentiating the feedback signal achieves ultra-fast switching of the buck converter. The adaptive hysteresis window control allows a monotonous operation with predictable noise spectrum, and gives way to efficient design for variable supply and output voltages. The measurement results in a $0.13-{\mu}m$ CMOS process indicated that the switching frequency became double times higher, and the voltage ripple was reduced by up to 69%. They also indicated that the normalized switching frequency variation was reduced by 74% with variable $V_{DD}$ and by 63% with variable $V_{OUT}$. The power efficiency was improved by 3.5% depending on loading condition.

A Development of Recoil & Counter Recoil Motion Measurement System Using LVDT

  • Park, Ju-Ho;Hong, Sung-Soo;Joon Lyou
    • Transactions on Control, Automation and Systems Engineering
    • /
    • v.2 no.3
    • /
    • pp.214-219
    • /
    • 2000
  • This paper presents a recoil and counter recoil motion measurement system using linear variable differential transformers (LVDT). The output of the LVDT is obtained from the differential voltage of the secondary transformers. Since a transducer core is attached to the motion body, the output is directly proportional to the movement length of the core. Displacement, velocity and acceleration are measured from the LVDT. With a comparison between the measurement result and the reference value obtained by the highly accurate Vernier calipers, it is proved that the measurement system with the LVDT is applicable to the test of the moving part of the mechanism with better accuracy.

  • PDF

The Development of Inverter Washing Machine Using Induction Motor (유도전동기를 적용한 인버터 세탁기 개발)

  • Lee, Hyun-Il;Lim, Moo-Saeng;Han, Yong-Bum
    • Proceedings of the KIEE Conference
    • /
    • 1999.07f
    • /
    • pp.2556-2558
    • /
    • 1999
  • We present voltage-source inverter for variable speed of washing machine. In the case of previous washing machines only on/off contol of motor was satisfied but these days the desire of customers moves to more silent and energy saving machine. Therefore many white goods manufacturers consider variable driving methods of motor. Nowadays variable speed Induction motors powered by inverters are becoming more and more popular. In this paper the principles of constant V/F control of Induction motor used in washing machine and space vector PWM technique are reviewd. Implementation issues such as command voltage generation, switching pattern determination, speed and power measurement are also presented. Experimental results are included in the end of the paper.

  • PDF

An alternating motion technique using linear variable differential transformers (선형변이 차동변압기를 이용한 왕복운동 계측기법)

  • Choi, Ju-Ho;Kim, Yoon-Gyeom;Yoo, Jun
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1996.10b
    • /
    • pp.1380-1383
    • /
    • 1996
  • This paper presents a recoil and counter recoil(R&CR) motion measurement method using linear variable differential transformers(LVDT). The output of a LVDT is obtained from the differential voltage of the 2nd transformers. As a sensor core is attached at the motion body, the output is directly proportional to the core motion. Displacement, velocity and acceleration are measure from the core length. With a comparison between the measurement result and the known value which is obtained by the precision steel tape, the accuracy and the usefulness of the proposed scheme is validated.

  • PDF