• Title/Summary/Keyword: AD Converter

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A Study on Platform Development for Nerve Stimulation Response Measurement (신경자극반응 측정을 위한 플랫폼 구현에 관한 연구)

  • Shin, Hyo-seob;Kim, Young-kil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2009.10a
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    • pp.521-524
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    • 2009
  • Response to nerve stimulation platform for implementing measures to detect finger movement has been functioning as an important factor. This stimulated finger on the nerve and muscle responses would vary. In other words, the finger movement of the muscle response to nerve stimulation and sensing Actuator for the H/W development is needed. In addition, a low power embedded CPU based on the top was used. H/W configuration portion of the isolation power, constant current control, High impedance INA, amplifier parts, and the stimulus mode and the Micro-control the status of current, AD converter Low Data obtained through the processing system is implemented.

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The Remote Control of a Flyback Converter using an Inexpensive Microcontroller (저가형 마이크로 콘트롤러를 이용한 Flyback 컨버터의 원격제어)

  • 김윤서;양오
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.41 no.6
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    • pp.67-74
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    • 2004
  • Differently from an existing analog control, because the digital control includes microprocessor basically, the digital control is enable to monitor internal parameters of DC-DC converter and to control output voltage remotely by communicating with a Windows based PC. These things are impossible in an analog control and there are more advantages in a digital control than an analog control. In this paper, with the advantages mentioned above, the feasibility of digital controlled DC-DC converter in low price is proposed. In order to implement these functions, it is used the inexpensive H8/3672 made by Renesas that has built in AD converters and PWM logic generators. The proposed digital controller is applied to a flyback converter that is designed to output DC 5[V] from DC 20∼30[V] and is remotely controlled to make variable outputs from DC 0[V] to 5[V] above in PC. The PWM controller adopts the PD controller in PID. In the last, the response characteristics of a step reference voltage and in a steady state are experimented to verify the feasibility and the usefulness of the proposed flyback converter that is implemented inexpensively.

A Study of the Exclusive Embedded A/D Converter Using the Microprocessor and the Noise Decrease for the Magnetic Camera (마이크로프로세서를 이용한 자기카메라 전용 임베디드형 AD 변환기 및 잡음 감소에 관한 연구)

  • Lee, Jin-Yi;Hwang, Ji-Seong;Song, Ha-Ryong
    • Journal of the Korean Society for Nondestructive Testing
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    • v.26 no.2
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    • pp.99-107
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    • 2006
  • Magnetic nondestructive testing is very useful far detecting a crack on the surface or near of the surface of the ferromagnetic materials. The distribution of the magnetic flux leakage (DMFL) on a specimen has to be obtained quantitatively to evaluate the crack. The magnetic camera is proposed to obtain the DMFL at the large lift-off. The magnetic camera consists of a magnetic source, magnetic lens, analog to digital converters (ADCs), interface, and computer. The magnetic leakage fields or the distorted magnetic fields from the object, which are concentrated on the magnetic lens, are converted to analog electrical signals tv arrayed small magnetic sensors. These analog signals are converted to digital signals by the ADCs, and are stored, imaged, and processed by the interface and computer. However the magnetic camera has limitations with respect to converting and switching speed, full range and resolution, direct memory access (DMA), temporary storage speed and volume because common ADCs were used. Improved techniques, such as those that introduce the operational amplifier (OP-Amp), amplify the signal, reduce the connection line, and use the low pass filter (LPF) to increase the signal to noise ratio are necessary. This paper proposes the exclusive embedded ADC including OP-Amp, LPF, microprocessor and DMA circuit for the magnetic camera to satisfy the conditions mentioned above.

Robot Design for Fire Detection and Data Processing (화재감지를 위한 로봇 설계 및 데이터 처리)

  • Moon, Yong-Seon;Seo, Young-Nam;Ko, Nak-Young;Roh, Sang-Hyun;Park, Jongkyu
    • The Journal of the Korea institute of electronic communication sciences
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    • v.5 no.1
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    • pp.31-36
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    • 2010
  • In this paper, an autonomous mobile robot for fire detection is designed. The robot is equipped with thermal sensor which rotates for wide range of detection. The fire detector A2TPMI is used. A data processing method for robust fire detection is also implemented. AD converter and Kalman filter is applied to remove noisy signal from the fire detection sensor.

FMEDA Analysis for the Protection Controller F-LIC of ITER AC/DC Converters (ITER AD/DC Converter의 보호제어기 F-LIC에 대한 FMEDA 분석)

  • Shin, Hyun Kook;Oh, Jong-Seok;Suh, Jae Hak;Chung, In Seung;Lee, Lack Sang
    • Proceedings of the KIPE Conference
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    • 2017.11a
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    • pp.121-122
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    • 2017
  • ITER AC/DC 컨버터(Converter)는 핵융합 발생을 위해 토카막의 초전도코일에 제어된 전류를 공급하여 플라즈마 발생, 형상 유지, 소멸하는 기능을 한다. 만일 컨버터 또는 초전도코일에 이상이 발생하면 즉시 보호동작이 실행되어야 한다. 이를 위해 설계된 F-LIC(Fast Local Interlock Controller)은 즉시 작동하여 Bypass 및 Make Switch 트리거, 차단기 작동 등을 순차적으로 수행한다. ITER Interlock System의 기기는 중요성이 고려되어 높은 신뢰도가 요구된다. 본 논문에서는 F-LIC 회로분석과 Telcordia SR-332 Standard에 의한 부품고장률 산출방법을 사용하여 FMEDA를 분석하고, 이를 통하여 회로구성 부품의 고장이 미치는 영향과 F-LIC 제어모듈의 SIL-2 등급의 적합성을 분석하였다.

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Fabrication of High Precision Pre-amplifier for EEG Signal Measurement and Development of Auto Classification System (뇌파신호 측정을 위한 고성능 전치증폭기 제작 및 자동 신호분류 시스템 개발)

  • 도영수;장긍덕;남효덕;장호경
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.11a
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    • pp.409-412
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    • 2000
  • A high performance EEG signal measurement system is fabricated. It consists of high precision pre-amplifier and auto identification bandwidth unit. High precision pre-amplifier is composed of signal generator, signal amplifier with a impedance converter, body driver and isolation amplifier. The pre-amplifier is designed for low noise characteristics, high CMRR, high input impedance, high IMRR and safety, Auto identification bandwidth unit is composed of AD-converter and PIC micro-controller for real time processing EEG signal. The performance of EEG signal measurement system has been shown the classified bandwidth through the clinical demonstrations.

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Vector control of AC servo motor using high Performance DSP (고성능 DSP를 이용한 AC 서보 모터의 벡터제어)

  • Choi, Chi-Young;Hong, Sun-Gi
    • Proceedings of the KIEE Conference
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    • 2003.04a
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    • pp.258-261
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    • 2003
  • This paper is a studying of the vector control of AC servo motor using a high performance DSP(TMX320F2812). This DSP has many special peripheral circuits to drive a AC Servo motor as AD converter, QEP and so on. It makes us reduce the time of developing a control system and also can be simple size controller. We use vector control algorithm for instantaneous torque control and SVPWM algorithm by offset voltage methods.

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Design and Development of Motor Nerve Conduction Velocity Measuring Device Based on Microprocessor (마이크로 컴퓨터를 이용한 운동신경전도속도 측정기의 설계와 제작에 관한 연구)

  • 김태욱
    • Journal of Biomedical Engineering Research
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    • v.10 no.3
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    • pp.361-364
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    • 1989
  • A PC-based motor nerve conduction velocity measuring system was designed and constructed. The system was composed with an EMG preamplifier, a stimulator, an Apple II plus microcomputer and an 8 bit AD converter. The system was primariliy intended to screen motor nerve difficulties of industrial workers. This system can acquire, store and display the waveforms of evoked potentials. The PC-based system is expected to increase the versatility and applicability as well as to reduce the system cost.

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Design of RF Digital Spectrum Analyser for Mobile Communication (이동 통신용 RF 디지털 스펙트럼 분석기 설계)

  • Woo, Kwang-Joon
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.44 no.6
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    • pp.29-34
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    • 2007
  • It is important to analyse the frequency spectrum for the measurement of modulated signal, distortion, and noise. The frequency spectrum analysis is performed by the execution of Radix-2 DIT DFT i.e. FFT algorithm. The discrete input signal converted by A/D converter from the input signal in time domain is mathematically transformed to the frequency spectrum by FFT algorithm. In this study, we design the digital spectrum analyser by the hardware based on the TMS320F2812 DSP and AD9244 converter, and by the software based on the C28x S/W modules. We can timely analyse the frequency spectrum in mobile communication system by the digital frequency analyser based on the high performance DSP and S/W modules. This real-time analysing capability is the important performance in the internet-based mobile communication server system.

A study on the Development of an electronic control unit using digital sensors for propulsion systems (디지털센서를 이용한 추진 시스템 전자 제어장치 연구)

  • Son, Jong-Dae;Kim, Jung-Hoe;Lee, Jae-Yun;Kim, Tae-Wan;Yoon, Soo-Hee;Lee, Yong-Hwan;Kwak, Geunn-Yeong;Chung, Soon-Bae
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.11a
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    • pp.167-169
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    • 2010
  • Electronic control units for propulsion systems are devices which compute control algorithm by processing the systems' internal sensor signals. Due to the effect of transmission between sensors and a control unit, previous analog systems have drawbacks of signal attenuation and susceptibility to noises. However, a digital sensor can be less influenced by the electrical cable line as it includes sensor, AMP, and AD converter in one module. In addition, it can reduce the process time for control algorithm because extra S/W filtering process is not needed. The current study shows how to process signals for an electronic control unit using digital sensors.

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