• Title/Summary/Keyword: electric battery

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The Study for Characteristic of Direct Methanol Fuel Cell in Ambient Temperature (상온 상태에서 직접 메탄올 연료전지의 특성 연구)

  • Yun, Hyo-Jin;Kim, Jeong-Ju;Kim, Dong-Jin
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.5
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    • pp.955-961
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    • 2009
  • Present, a portable battery have problem that the volume increases according to capacity Increase. Direct Methanol Fuel Cell is alternative by solution plan of this problem. In this paper, the characteristics of DMFC are analyzed by change in concentration and discharge of fuel in natural convection and room temperature condition. According to the analysis result, polarization by delay of diffusion velocity of hydrogen ion appeared in methanol of low concentration. And if have a lot of supplies of methanol, generation power declines by electric cell cooling effect.

Development of Low Power Driven Inner Tap Inspection System capable of Wireless Communication with Video Equipment (영상기기와 무선통신이 가능한 저전력 구동의 이너탭 검사시스템 개발)

  • Ahn, Sung-Su
    • Journal of Korea Multimedia Society
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    • v.21 no.6
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    • pp.649-658
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    • 2018
  • In this paper, we propose a mechanical contact inner tap inspection system that can inspect the defect of the inner tap immediately after inner tap is processed within the machining center. The inspection module has the collet chuck structure, so it can mounted on the main spindle of the machining center during inspection. It was developed with a focus on inspection for tap having 20 mm depth which is primarily fabricated in automotive parts and has a double sided PCB-type control system including sensing function based on Zigbee module, micom and IR sensor for wireless transmission of measured data with low power operation, and also a battery for supplying electric power. The current consumption is 46.8mA in the inspection operation mode and 0.0268mA in the power saving mode for 3.7V of the applied power source, so that 30,000 times or more inspection can be performed with assumed 5 seconds inspection time for one tap. Experiments in test jig system and actual machining center confirm that the proposed inner tap inspection system can be applied to the batch process of simultaneous inspection after tapping in the machining center.

High Performance Switched Reluctance Motor Drive for Automobiles using C-dump Converters

  • Song Sang-Hoon;Yoon Yong-Ho;Lee Tae-Won;Kim Yeun-Chung;Won Chung-Yuen
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.992-996
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    • 2004
  • Small electric motors in an automobile perform various tasks such as engine cooling, pumping, and in heating, ventilating, and air-conditioning (HVAC) system. At present, most of dc motors are supplied by 12V or 24V batteries. However, DC motors surfer from lack of efficiency, low life cycles and unreliability. Therefore, there is a growing interest in substituting DC motors for advanced AC motors including switched reluctance motors. Although there are several other forms SRM converters, they are either unsatisfactory to the control performance or unsuitable for the 12V-battery powered 3-phase SRM drives. Taking into account the requirement for effective operation and simplicity structure of converter in the limited internal environment of automobiles, the author inclines toward selecting the modified C-dump converter as well as the energy efficient C-dump converter. This is so that more economical and efficient converter topology in automobile industries can be utilized. This paper describes the foundation for the design and development of a 12V-250W-3000rpm SRM drives for automobiles. Furthermore, complete circuit, computer simulation and experiment results are presented to verify the performance of the C-dump converters.

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Optimization of Stand-Alone Hybrid Power Systems Using HOMER Program (HOMER 프로그램을 이용한 독립형 하이브리드 발전시스템 최적화)

  • Yang, Su-Hyung;Boo, Chang-Jin;Kim, Ho-Chan
    • Journal of the Korean Solar Energy Society
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    • v.32 no.2
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    • pp.11-18
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    • 2012
  • Diesel fuel is expensive because transportation to remote areas adds extra cost, and it causes air pollution by engine exhaust. Providing a feasible economical and environmental solution to diesel generators is important. A hybrid system of renewable plants and diesel generators can benefit islands or other isolated communities and increase fuel savings. Renewable energy is, however, a natural source that produces a fluctuating power output. In this paper, hybrid power system of the marado lighthouse is proposed to supply stable power in the stand-alone hybrid power system. The proposed hybrid power system consists of the diesel generator, wind turbine, photovoltaic, fuel cell, and battery bank. To decrease the carbon emissions and find the optimization, the cost analysis of hybrid system is simulated using HOMER program and the optimized hybrid power system is designed.

Numerical Simulation for a Multi-Stage Deep Drawing of Anisotropic SUS409L Sheet into a Rectangular Cup (초기 이방성 SUS409L 박판재의 직사각 컵 성형을 위한 다단 디프드로잉 공정 적용에 관한 수치적 연구)

  • Park, J.W.;Ku, T.W.;Kang, B.S.
    • Transactions of Materials Processing
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    • v.22 no.3
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    • pp.133-142
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    • 2013
  • Recently, electric vehicles and hybrid cars are being promoted as alternatives to reduce automobile emissions. Generally, thin sheet materials such as aluminum alloy AA300X and cold-rolled steel sheet such as JIS-G-3141 are used for the container for the lithium-ion secondary batteries. In this study, a multi-stage deep drawing process is used to produce a rectangular cup from thin stainless steel sheet material, SUS409L, with an initial blank thickness of 0.4mm for the battery container application. Numerical simulations of the first through the fifth stages for the multi-stage deep drawing with thin SUS409L sheet were conducted using LS-Dyna3D Implicit/Explicit. Special consideration was given to the deformation characteristics due to the normal anisotropy of the sheet material. The numerical simulations were conducted with both isotropic properties and the anisotropic properties of the initial blank material. An unexpected forming failure, barreling in the bottom region of the deep drawn rectangular cup, was observed. This failure mode can be avoided by additional ironing thickness control during the process.

Development of Piezoelectric Energy Harvesting Device and Experiments (압전체를 이용한 에너지 수집 장치 개발 및 실험)

  • Kim, Ki-Young;Kwak, Moon-K.;Kang, Ho-Yong;Kim, Nae-Soo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.04a
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    • pp.81-89
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    • 2008
  • This paper is concerned with the development of the piezoelectric energy harvesting(PEH) device for ubiquitous sensor node(USN). The USN needs auxiliary power to lengthen its operational life. In this study, the piezoelectric energy harvesting system consisting of a cantilever with a tip mass and piezoelectric wafer was investigated in detail both theoretically and experimentally. The dynamic model for the addressed system was derived using the assumed mode method. The resulting equations of motion were expressed in matrix form, which had never been developed before. The power output characteristics of the PEH was then calculated and discussed. Various experiments were carried out to investigate the charging characteristics of electrical components. Theoretical and experimental results showed that the PEH was able to charge a battery with ambient vibrations but still needed an effective mechanism which can convert mechanical energy to electrical energy and an optimal electric circuit which dissipates small energy.

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Study of AC/DC Resonant Pulse Converter for Energy Harvesting (에너지 획득을 위한 AC/DC 공진형 펄스 컨버터의 연구)

  • Ngo Khai D.T.;Chung Gyo-Bum
    • The Transactions of the Korean Institute of Power Electronics
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    • v.10 no.3
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    • pp.274-281
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    • 2005
  • A new resonant pulse converter for energy harvesting is proposed. The converter transfers energy from a low-voltage AC current to a battery. The low-voltage AC current source is an equivalent of the piezoelectric generator, which converts the mechanical energy to the electric energy. The converter consists of a full-bridge rectifier having four N-type MOSFETs and a boost converter haying N-type MOSFET and P-type MOSFET instead of diode. Switching of MOSFETs utilizes the capability of the $3^{rd}$ regional operation. The operational principles and switching method for the power control of the converter are investigated with the consideration of effects of the parasitic capacitances of MOSFETs. Simulation and experiment are performed to prove the analysis of the converter operation and to show the possibility of the $\mu$W energy harvesting.

Micro-power Properties of 31Type Triple-morph Cantilever for Energy Harvesting Device (31 타입 트리모프 켄틸레버의 마이크로 발전 특성 연구)

  • Kim, In-Sung;Joo, Hyeon-Kyu;Jung, Soon-Jong;Kim, Min-Soo;Song, Jae-Sung;Jeon, So-Hyun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.11a
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    • pp.220-221
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    • 2008
  • With recent advanced in portable electric devices, wireless sensor, MEMS and bio-Mechanics device, the new typed power supply, not conventional battery but self-powered energy source is needed. Particularly, the system that harvests from their environments are interests for use in self powered devices. For very low powered devices, environmental energy may be enough to use power source. Therefore, in other to made piezoelectric energy harvesting device. The made 31 type triple-morph cantilever was resulted from the conditions of 100k$\Omega$, 0.25g, 154Hz respectively. The thick film was prepared at the condition of $6.57V_{rms}$, and its power was $432.31{\mu}W$ and its thickness was $50{\mu}m$.

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Dynamic Modeling of Piezoelectric Energy Harvesting Device and Experiments (압전 에너지 수집 장치의 동적모델링 및 실험)

  • Kwak, Moon-K.;Kim, Ki-Young;Kang, Ho-Yong;Kim, Nae-Soo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.6
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    • pp.632-641
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    • 2008
  • This paper is concerned with the development of the piezoelectric energy harvesting(PEH) device for ubiquitous sensor node(USN). The USN needs auxiliary power to lengthen its operational life. In this study, the piezoelectric energy harvesting system consisting of a cantilever with a tip mass and piezoelectric wafer was investigated in detail both theoretically and experimentally. The dynamic model for the addressed system was derived using the assumed mode method. The resulting equations of motion were expressed in matrix form, which had never been developed before. The power output characteristics of the PEH was then calculated and discussed. Various experiments were carried out to investigate the charging characteristics of electrical components. Theoretical and experimental results showed that the PEH was able to charge a battery with ambient vibrations but still needed an effective mechanism which can convert mechanical energy to electrical energy and an optimal electric circuit which dissipates small energy.

A Study on Efficient Management of Solar Powered LED Street Lamp Using Weather forecast (기상예보를 이용한 태양광 LED 가로등의 효율적 운용에 관한 연구)

  • Pyo, Se-Young;Kwon, Oh-Seok;Kim, Kee-Hwan
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.15 no.2
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    • pp.129-135
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    • 2015
  • This study, in the operation of street lamp, suggests appropriate algorithm to extend the number of days of street lamp operation as much as possible if the number of sunless days continues and experimentally determines the value of Weather Factor necessary for this algorithm. This is conducted by reducing electricity consumption and securing battery remains through the use of standby power mode, in which maximum amount of light is maintained if there is a pedestrian, and constant brightness is maintained without utilizing maximum electric power if no pedestrians exist, with the application of WFactor value created by the algorithm considering weather forecast and amount of sunlight.