• Title/Summary/Keyword: Pulse power supply

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Design of Bipolar Pulse Power Supply for Strategic Mineral Exploration (전략광물 탐사를 위한 양극성 펄스전원장치 설계)

  • Bae, Jung-Soo;Jang, Sung-Roc;Yu, Chan-Hun;Kim, Hyoung-Suk;Kim, Jong-Soo
    • Proceedings of the KIPE Conference
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    • 2017.07a
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    • pp.90-91
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    • 2017
  • 본 논문은 전략광물 탐사를 위한 25kW급 양극성 펄스전원장치에 대하여 기술한다. 고효율 LCC 공진형 컨버터를 적용한 DC/DC 전력변환 회로부와 펄스를 발생시키기 위한 풀 브릿지 기반의 양방향 펄스 스위칭부로 구성된 500V, 12.5A 단위모듈을 설계하고, 4개의 모듈을 직병렬 구성하여 탐사 방식에 따라 요구되는 고전압 저전류(2kV, 12.5A) 혹은 저전압 대전류(500V, 50A) 동작이 가능한 전략광물 탐사용 펄스전원장치를 개발한다. 본 논문에서는 공진회로, 변압기 등 단위모듈의 상세설계에 대하여 기술하고, 시뮬레이션 및 실험 결과를 통해 이를 검증한다.

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Suppression Method for Torque Ripple of PM Synchronous Motor

  • Yonezawa Hiroyuki;Taniguchi Katsunori;Lee Hyun Woo
    • Journal of Power Electronics
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    • v.5 no.4
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    • pp.264-271
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    • 2005
  • A new modified trapezoidal modulating signal for a pulse width modulation (PWM) inverter suitable for a permanent magnet synchronous motor (PMSM) drive is proposed in this paper. A new modulating signal for the PMSM drive is determined by the characteristic torque ripple of the motor with various electro-motive force (EMF). The proposed modulating signal is able to decrease the torque ripple even if the motor has sinusoidal EMF or non-sinusoidal EMF. By using the proposed modulating signal, the system reduced the torque ripple as well as achieved the effective utilization of the DC supply voltage for the inverter. Many improvements are accomplished by the PWM strategy adapting the modified trapezoidal modulating signal without a change in hardware.

A Study on the Piezoelectric Energy Harvesting Using SSHI Technique (SSHI 기법을 이용한 압전소자로부터의 에너지 회수에 대한 연구)

  • Nam, Yoon-Su;Park, Jong-Soo;Park, Hae-Gyoon;Lee, Jae-Kang
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.6
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    • pp.92-98
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    • 2008
  • The target of this paper is to study on the usefulness of the SSHI technique as a wireless electrical power supply when it is driven by mechanical vibrations of low frequency. A THUNDER series a piezoelectric material (TH7-R), which has been developed by a NASA engineer is selected for this study. A mechanical motion vibrator supplies piezoelectric material with mechanical energy. An optical fiber sensor and a pulse generating circuit are used to accomplish the parallel-SSHI technique. As a result of this study, energy harvesting using SSHI technique results in a significant increase of the electrical power flow.

Partial Discharge Position Tracking Method using a GIS Partial Discharge Signal and Arrival Time Difference (GIS 부분방전 신호와 도착 시간차 분석을 통한 PD발생 위치 추적)

  • Choi, Mun-Gyu;Cha, Hanju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.9
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    • pp.1297-1301
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    • 2013
  • This paper analyzes of PD occurrence position through an analysis of the arrival time difference between the GIS partial discharge signal. Because of GIS (Gas Insulated Switchgear) is a facility very important power equipment and as part of the equipment that make up the power system, the stabilization of the power industry, which accounted for 88.5% share of GIS substation in the form of a substation is an important equipment for power supply. In the situation where we are gradually expanding the need for preventive diagnosis in order to improve the efficiency of equipment management and failure prevention for Preventive diagnosis. In this paper as a method for extracting pre-defect of failure of GIS Apply the average value method of calculating the 5 times each using a pulse of the first time of the second pulse (${\Delta}t$) with an oscilloscope generation position PD(Partial Discharge). the results of GIS internal inspection, the partial discharge of the actual the position of the partial discharge was confirmed with an accuracy of about 82% of positions. Arrival time difference in the most effective manner if the partial discharge of GIS internal occurs by applying the averaging method and TOA(Time of arrival) method, the partial discharge occurs you through the measurement and analysis of PD signal occurs was confirmed in the experiment are presented and diagnostic methods location tracking.

A Study of LCD Panel Cleaning Effect of Plasma Generation Power Source (플라즈마 발생용 전원장치의 LCD 패널 세정효과에 관한 연구)

  • Kim, Gyu-Sik
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.45 no.5
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    • pp.44-51
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    • 2008
  • UV lamp systems have been used for cleaning of display panels of TFT LCD or Plasma Display Panel (PDP). However, the needs for high efficient cleaning and low cost made high voltage plasma cleaning techniques to be developed and to be improved. Dielectric-Barrier Discharges (DBDs), also referred to as barrier discharges or silent discharges have been exclusively related to ozone generation for a long time. In this paper, a 6kW high voltage plasma power supply system was developed for LCD cleaning. The 3-phase input voltage is rectified and then inverter system is used to make a high frequency pulse train, which is rectified after passing through a high-power transformer. Finally, hi-directional high voltage pulse switching circuits are used to generate the high voltage plasma. Some experimental results showed the usefulness of atmospheric plasma for LCD panel cleaning.

A Class-D Amplifier for a Digital Hearing Aid with 0.015% Total Harmonic Distortion Plus Noise

  • Lee, Dongjun;Noh, Jinho;Lee, Jisoo;Choi, Yongjae;Yoo, Changsik
    • ETRI Journal
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    • v.35 no.5
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    • pp.819-826
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    • 2013
  • A class-D audio amplifier for a digital hearing aid is described. The class-D amplifier operates with a pulse-code modulated (PCM) digital input and consists of an interpolation filter, a digital sigma-delta modulator (SDM), and an analog SDM, along with an H-bridge power switch. The noise of the power switch is suppressed by feeding it back to the input of the analog SDM. The interpolation filter removes the unwanted image tones of the PCM input, improving the linearity and power efficiency. The class-D amplifier is implemented in a 0.13-${\mu}m$ CMOS process. The maximum output power delivered to the receiver (speaker) is 1.19 mW. The measured total harmonic distortion plus noise is 0.015%, and the dynamic range is 86.0 dB. The class-D amplifier consumes 304 ${\mu}W$ from a 1.2-V power supply.

Control and Modulation of Three to Asymmetrical Six-Phase Matrix Converters based on Space Vectors

  • Al-Hitmi, Mohammed A.;Rahman, Khaliqur;Iqbal, Atif;Al-Emadi, Nasser
    • Journal of Power Electronics
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    • v.19 no.2
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    • pp.475-486
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    • 2019
  • This paper proposes the modulation and control of a three-to-six-phase matrix converter with an asymmetrical six-phase output. The matrix converter (MC) outputs consist of two sets of three-phase spatially shifted by $30^0$, where the two sets have two isolated neutrals. The space vector approach is considered for the modeling and subsequent modulation of the three-to-six phase MC. The intelligent selection of voltage space vectors is made to synthesize the reference voltages and to obtain a sinusoidal output. The dwell times of selected voltage space vectors are adjusted in such a way that the effect of the second and the third auxiliary plane vectors (i.e., x1-y1, and x2-y2) are nullified. To achieve the maximum output voltage gain and to ensure that no reactive power is drawn from the utility supply, the input side power factor is maintained at unity. Nevertheless, the source side power factor is controllable. The modulation technique is implemented in dSPACE working in conjunction with a FPGA. Hardware results that validate the proposed control algorithm are discussed.

A Development of the X-Band 63 Watt Pulsed SSPA for Radar (레이더용 X-대역 63 Watt Pulsed SSPA 개발)

  • Chong, Min-Kil;Na, Hyung-Gi
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.3
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    • pp.380-388
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    • 2011
  • In this paper, we developed the X-band 63 watt pulsed SSPA(Solid State Power Amplifier) by using HMIC(Hybrid Microwave Integrated Circuits). The pulsed SSPA consists of power supply and 3-stage amplifier modules : pre-amplifier stage, driver-amplifier stage, final-amplifier stage. The developed pulsed SSPA provides more than 63 watts of output power with a short pulse width and the duty cycle of up to 1.2 % at $70^{\circ}C$. The fabricated module offers great than 37 dB of saturated gain across the operating band. Input and output VSWR is <1.5:1. This module has an average current of 400 mA typical and operates at a +28 $V_{dc}$ supply. The developed SSPA in this paper can apply to pulsed Doppler radar with high speed operation.

Study on Development of Portable Incubator (휴대용 인큐베이터의 개발에 관한 연구)

  • Eizad, Amre;Zahra, Falak;Alam, Hamza;Tahir, Hassan;Bangash, Afrasiab Khan;Lyu, Sung-Ki
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.9
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    • pp.1-6
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    • 2019
  • Preterm children require a controlled environment that is as close as possible to that inside the womb. Incubators are well equipped to fulfill this requirement; however, they are cumbersome and expensive, thereby restricting their portability and availability in less developed and rural areas. This research comprises the development and system validation of a portable incubator. The system consists of a collapsible baby enclosure that can be stowed inside the system base when not in use. The enclosure is made from acrylic such that it is easy to clean and allows unhindered visual observation of the occupant while being robust enough to withstand transit conditions. The system can be powered either by a mains supply or a 12-VDC automobile power supply. Additionally, it has an onboard battery to ensure a continuous supply during transit. A Peltier plate controlled using a microcontroller ensures the desired enclosure temperature irrespective of the ambient temperature. Built-in sensor probes can measure the skin temperature, pulse rate, blood oxygenation level, and ECG of the infant and display them on the system screen. The system function is validated by testing its peak power consumption and the heating and cooling performances of the environment control system.

The Transmit Method for Fingerprint sensing using Differential Pulse in Mutual Capacitance Touch Screen Panel for improving security of computer information (컴퓨터의 보안향상을 위한 상호정전용량 터치스크린패널의 차동펄스를 이용한 지문인식을 위한 송신법)

  • Kim, Seong Mun;Choi, Eun Ho;Ko, Nak Young;Bien, Franklin
    • Journal of the Institute of Electronics and Information Engineers
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    • v.54 no.7
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    • pp.55-60
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    • 2017
  • This paper is proposed on the transmit Method Finger-Printer Scanning of Mutual Capacitance Touch Screen Panel Using Differential Pulse for improving the security of computer information. This system is composed of differential pulse generator and Ring-Counter, also Supply voltage is 5V. this system generates the Pulse wave which is composed of In-Phase and Out of Phase at 1MHz while period of 2m/s. it is designed and be able to operate four channels. overall power consumption is approximately 78.08nW. This prototype is implemented in 0.25um CMOS Process and Chip area is $870um{\times}880um$.