• Title/Summary/Keyword: voltage signal

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An A/D Conversion System for Precision Weighing Signal Process (정밀 중량 계측 신호처리를 위한 A/D 변환 시스템)

  • Joo, Yong-Kyu;Jeon, Chan-Min;Park, Chan-Won
    • Proceedings of the KIEE Conference
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    • 2002.11c
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    • pp.301-304
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    • 2002
  • This paper has been studied an A/D conversion system for precision weighing signal process In weighing system. A/D conversion has some problem.; offset drift voltage with environment situation and nonzero value of initial output voltage. The Offset voltage in analog circuit produces a drift of an output voltage before A/D conversion stage. This paper suggested the method of reducing the offset voltage by switching analog chopping circuit and making the initial output close to zero to enhance the swing range by D/A converter. Also, we have designed active filter and digital filter with Auto Zero Tracking algorithm for better signal process of the weighing system.

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Driving and Position Sensing Algorithm for an Electrostatic Actuator Using Pulse-width Modulation (펄스폭 변조를 이용한 정전형 액추에이터의 구동 및 위치 검출 알고리즘)

  • Min, Dong-Ki;Jeon, Jong-Up
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.3
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    • pp.65-70
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    • 2008
  • Capacitive position sensing with modulation technique is widely used in electrostatic actuator applications. To maximize the electrostatic force and the position-sensing gain, capacitors for driving and capacitors for sensing are shared, i.e, after applying the driving voltage with high-frequency modulating signals using op amps, the position is demodulated from the modulated signal. In high-voltage applications, however, low bandwidth of a high-voltage op amp hinders adding the high-frequency modulating signal to the driving voltage. In this paper, new and very simple driving and sensing method is proposed, in which the pulse-width modulated driving voltage eliminates the need of the high-frequency modulating signal for position sensing. This new algorithm is proved by the simulation results using Matlab/SIMULINK.

Analysis of Small Signal Stability Considering Voltage Stability (전압안정도를 고려한 미소신호안정도 해석)

  • Kim, D.J.;Moon, Y.H.;Yoon, J.Y.
    • Proceedings of the KIEE Conference
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    • 2001.11b
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    • pp.323-326
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    • 2001
  • This paper describes the algorithm which can not only take account of voltage suability but also consider small signal stability. As for voltage stability both CPF and PoC methods are utilized to pinpoint the exact voltage collapse point. Then, using the converged load flow results full system matrix is configured and its eigenvalues are computed. The suggested algorithm is applied to the Two-area system, and verified its usefulness. In addition this paper also deals with the results of analyzing the two-area system in terms of voltage stability and small signal stability.

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A Development of Electronic Type Relay for Low Voltage Circuit Breaker based on Digital Signal Processing (디지털 신호 처리 기반 저압 차단기용 전자식 계전기 개발)

  • Park, Byung-Chul;Shon, Jong-Man;Song, Sung-Kun;Shin, Joong-Rin
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.5
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    • pp.81-88
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    • 2013
  • A low voltage circuit breaker protects electrical equipments from over current and short faults of system by cutting the power supply. The breaker use a thermal magnetic type trip device from the past. In recent years, electronic type relays are applied due to useful functions and services. The purpose of this development is full digitalizing of relay functions of a low voltage breaker. It includes separation of current sensor from current transformer, digital signal processing, high speed relaying, and voltage measuring for power meter. The suggestions are tested and implemented by making prototype and testing its all relay functions.

High Performance Circuit Design of a Capacitive Type Fingerprint Sensor Signal Processing (고성능 용량 형 지문센서 신호처리 회로 설계)

  • 정승민;이문기
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.41 no.3
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    • pp.109-114
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    • 2004
  • This paper proposes an advanced circuit for the fingerprint sensor signal processing. We increased the voltage between ridge and valley by modifying the parasitic capacitance eliminating circuit of sensor plate. The analog comparator was designed for comparing the sensor signal voltage with the reference signal voltage. We also propose an effective isolation strategy for removing noise and signal coupling of each sensor pixel. The fingerprint sensor circuit was designed and simulated, and the layout was performed.

An Applicability of Teager Energy Operator and Energy Separation Algorithm for Waveform Distortion Analysis : Harmonics, Inter-harmonics and Frequency Variation

  • Cho, Soo-Hwan;Hur, Jin;Chung, Il-Yop
    • Journal of Electrical Engineering and Technology
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    • v.9 no.4
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    • pp.1210-1216
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    • 2014
  • This paper deals with an application of Teager Energy Operator (TEO) and Energy Separation Algorithm(ESA) to detect and determine various voltage waveform distortions like harmonics, inter-harmonics and frequency variation. Because the TEO and DESA algorithm was initially proposed for speech or communication analysis, its applications are limited to some types of waveform in the power quality analysis area. For example, an undistorted voltage signal is similar with a pure sinusoid. A voltage fluctuation is very similar with an amplitude-modulated signal, from the viewpoint of signal theory. And a continuous frequency variation is similar with a frequency-modulated signal, which is also known as a chirp signal. This paper is written to show that the TEO and DESA algorithm can be used for detecting occurrences of the representative waveform distortions and determining their instantaneous information of amplitude and frequency.

Design of BiCMOS Signal Conditioning Circuitry for Piezoresistive Pressure Sensor (압저항형 압력센서를 위한 BiCMOS 신호처리회로의 설계)

  • Lee, Bo-Na;Lee, Moon-Key
    • Journal of Sensor Science and Technology
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    • v.5 no.6
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    • pp.25-34
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    • 1996
  • In this paper, we have designed signal conditioning circuitry for piezoresistive pressure sensor. Signal conditioning circuitry consists of voltage reference circuit for sensor driving voltage and instrument amplifier for sensor signal amplification. Signal conditioning circuitry is simulated using HSPICE in a single poly double metal $1.5\;{\mu}m$ BiCMOS technology. Simulation results of band-gap reference circuit showed that temperature coefficient of $21\;ppm/^{\circ}C$ at the temperature range of $0\;{\sim}\;70^{\circ}C$ and PSRR of 80 dB. Simulation results of BiCMOS amplifier showed that dc voltage gain, offset voltage, CMRR, CMR and PSRR are outperformed to CMOS and Bipolar, but power dissipation and noise voltage were more improved in CMOS than BiCMOS and Bipolar. Designed signal conditioning circuitry showed high input impedance, low offset and good CMRR, therefore, it is possible to apply sensor and instrument signal conditioning circuitry.

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Tool Life Monitoring using AE Signal in Gear Shaping (기어가공식 AE 신호를 이용한 공구수명의 감시)

  • 최성필
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.04a
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    • pp.130-134
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    • 1996
  • The characteristics of AE(Acoustic Emission) signal is related to cutting conditio, tool material, and tool geometry in metal cutting. The relation between AE signal and tool life was investigated experimentally. Experiment is carried out by gear shaping and SCM 420 workpiece. AE RMS voltage were increased according totool wear. It is suggested that maximum value of AE RMS voltage is an effective parameter to monitor tool life.

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A Design of Digital Instrumentation Amplifier converting standard sensor output signals into 5V voltage-output (표준 센서 출력신호를 5V 전압-출력을 변환하는 디지털 계측 증폭기 설계)

  • Cha, Hyeong-Woo
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.48 no.11
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    • pp.41-47
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    • 2011
  • A novel digital instrumentation amplifier(DIA) converting universal signal inputs into 5V voltage-output for industry standard sensor signal processing was designed. The circuit consists of a commercial instrumentation amplifier, seven analog switches, two voltage references of 1.0V and -10.0V, and four resistors. The converting principle is the circuit reconstruction by switches for resistor values and reference voltages according to input signals. The simulation result shows that the DIA has a good output voltage characteristics of 0~5V for the input voltage of 0V~5V, 1V~5V, -10V~+10V, and 4mA~20mA. The nonlinearity error was less than 0.1% for the four type signal inputs.

A Small Signal Modeling of Three-level Neutral-Point-Clamped Inverter and Neutral-Point Voltage Oscillation Reduction (3레벨 NPC인버터의 소신호 모델링과 중성점 전압 진동 저감)

  • Cho, Ja-Hwi;Ku, Nam-Joon;Joung, Seok-Eon;Hyun, Dong-Seok
    • The Transactions of the Korean Institute of Power Electronics
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    • v.19 no.5
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    • pp.407-414
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    • 2014
  • This study proposes a control design for the grid output current and for reducing the neutral-point voltage oscillation through the small-signal modeling of the three-phase grid connected with a three-level neutral-point-clamped (NPC) inverter with LCL filter. The three-level NPC inverter presents an inherent problem: the neutral-point voltage fluctuation caused by the neutral-point current flowing in or out from the neutral point. The small signal modeling consists of averaging, dq0 transformation, perturbing, and linearizing steps performed on a three-phase grid connected to a three-level NPC inverter with LCL filter. The proposed method controls both the grid output and neutral-point currents at every switching period and reduces the neutral-point voltage oscillation. The validity of the proposed method is verified through simulation and experiment.