• Journal of the Korean Institute of Telematics and Electronics
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• v.5 no.3
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• pp.1-8
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• 1968

This thermcelectrie generator devices have been determined for bismuth alloys, Sb2T and AnSb containing small amounts of doping materials. The thermoeleotric matermoelectric power;$\alpha$; resistivity; $\rho$, heatconduction; k, and temperature difference between cold and hot junction was measured. Generator consisting both B T + B S and B T+S T is better efficient than others containing another thermoceuple matarials. Its efficiency is 1.42%.

• Vacuum Magazine
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• v.2 no.1
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• pp.17-20
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• 2015

In this article, a historical and scientific review on the development of an ultrafast electron microscope is supplied, and the challenges in further improvement of time resolution under sub-picosecond or even sub-femtosecond scale is reviewed. By combining conventional scanning electron microscope and femtosecond laser technique, an ultrafast electron microscope was invented. To overcome its temporal resolution limit which originates from chromatic aberration and Coulomb repulsion between individual electrons, a generation of electron pulse via strong-field photoemission has been investigated thoroughly. Recent studies reveal that the field enhancement and field accumulation associated with the near-field formation at sharply etched metal nanoprobe enabled such field emission by ordinary femtosecond laser irradiation. Moreover, a considerable acceleration reaching 20 eV with near-infrared laser and up to 300 eV acceleration with mid-infrared laser was observed, and the possibility to control the amount of acceleration by varying the incident laser pulse intensity and wavelength. Such findings are noteworthy because of the possibility of realizing a sub-femtosecond, few nanometer imaging of nanostructured sample.in silicon as thermoelectric materials.

• Journal of Energy Engineering
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• v.9 no.1
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• pp.19-27
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• 2000

본 연구에서는 폐열회수를 위한 열전발전기술개발의 일환으로 자체 고안한 열전발전시스템을 구성하였고 상용화된 열전모듈을 적용하여 다양한 온도범위에서 열전모듈의 출력성능을 시험하였다. 시스템에 적용된 실험용 열전소자로는 49개의 열전쌍으로 구성된 미국 A 사의 모듈과 127개의 열전쌍으로 구성된 국내 B 사에서 제조한 모듈을 사용하였으며, 열전모듈 한 개에 대하여 , 그리고 5개의 모듈을 직렬로 연결하여 온도차 ($\Delta$T)를 변화시키면서 이때의 출력변화를 측정하였고, 또한15$0^{\circ}C$로 고정된 온도차에서 부하저항을 변화시키면서 출력성능을 실험하여 발전출력에 미치는 시스템인자들을 조사하고 이를 적용한 발전시스템의 최적조건을 도출하고자하였다.

• Solar Energy
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• v.18 no.3
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• pp.113-118
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• 1998

This project studied a new generator utilizing the Seebeck effect. The major objective of this study was to prove the baseline concept through experimental studies. The important results from this study included design and fabrication of a laboratory scale generating system. The generating capacity of the TE-generator was 500Watt. The preliminary testing results showed the system efficiency of close to 20%. The experimental testing system has been built to include heating element, circulation pump and the instrumentation system included watt-hour meter, temperature sensor, and data acquisition system by the Hewlett-Packard 75000 Series.

• Electronics and Telecommunications Trends
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• v.23 no.6
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• pp.12-21
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• 2008

최근 들어 나노기술의 발전에 힘입어 청정에너지를 구현할 수 있는 열전소자분야의 연구가 활발히 진행되고 있다. 열전소자는 태양에너지를 이용한 발전뿐만 아니라 체열, 폐열 및 지열 등을 이용한 발전 등 응용처가 매우 다양하며, 청정에너지를 생산할 수 있는 미래 지향적인 특성을 가진 분야라 할 수 있다. 그러나 아직까지 나노기술을 기반으로한 고효율의 열전소자는 기초 연구수준에서 그 가능성만 일부 선행 연구를 통하여 입증된 상태이다. 따라서 저비용, 고효율의 열전소자를 성공적으로 개발하게 된다면, 기술의 원천성 확보 및 초기 시장 점유에 매우 유리한 입지를 점할 수 있으리라 예측된다. 본 논문에서는 최근 들어 나노기술의 접목으로 새로이 주목받고 있는 열전소자의 동작 원리에 대한 간략한 소개와 이 분야의 최근 연구 동향 및 특허 동향에 대하여 살펴보고자 한다.

• Journal of the Korean Society of Industry Convergence
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• v.20 no.2
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• pp.187-194
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• 2017

This study examined the validity and reliability of the thermal safety design, in order to maintain the heat generated from integrated circuit (IC) chips in the converter, condenser, resistor, and transistor (which are considered as heat sources for thermoelectric devices with a printed circuit board) below target levels during the process of developing a control board and a main power board. The study analyzed the heat generation and dissipation characteristics of the entire printed circuit board (PCB) model to examine its thermal safety.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.9
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• pp.436-443
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• 2017

Recently, the development of new energy technologies has become a hot topic due to problems,such as global warming. Unlike renewable energy technologies, such as solar energy generation, solar power, and wind power, which are optimized to achieve medium or above output power, the output power of energy harvesting technology is very small and has not received much attention. On the other hand, as the mobile industry has been revitalized recently, the utility of energy harvesting technology has been reevaluated. In addition, the technology of tracking the maximum power point has been actively researched. This paper proposes a new MPPT(Maximum Power Point Tracking) control method for a TEM(thermoelectric module) for load resistance. The V-I curve characteristics and internal resistance of TEM were analyzed and the conventional MPPT control methods were compared. The P&O(Perturbation and Observation) control method is more accurate, but it is less economical than the CV (Constant Voltage)control method because it usestwo sensors to measure the voltage and current source. The CV control method is superior to the P&O control method in economic aspects because it uses only one voltage sensor but the MPP is not matched precisely. In this paper, a method wasdesigned to track the MPP of TEM combining the advantages of the two control method. The proposed MPPT control method wasverified by PSIM simulation and H/W implementation.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.34 no.3
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• pp.301-307
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• 2010

Actuation using a shape memory alloy (SMA) is considered to be an important technology that will play a leading role in market for next-generation medical devices because an SMA actuator can accurately imitate skillful and delicate hand movements. However, SMA actuators have not been successfully used because of problems in control design caused by the nonlinear hysteresis effect of SMA, which leads to inaccuracies in control systems. In order to overcome the effect, the authors invented a SMA actuator, which could actively and rapidly cool down and heat up, by combining a SMA catheter and a TE module using the Peltier effect. In order to evaluate the TE characteristics of our TE module system, the changes in the temperature with 1) incremental increases in a continuous electric current and 2) the appearance of a discontinuous constant or reverse current are discussed in this paper.

• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.798-801
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• 2009

소각로를 포함한 다양한 산업설비의 배폐열은 열병합 등의 다양한 방법을 통해 재활용되고 있으나 에너지의 효율적 사용과 편의성을 고려할 때, 단순한 온수공급 등의 방법보다는 전력으로서의 재활용이 매우 필요하다. 특히 재활용이 어려운 $400^{\circ}C$이내의 중저온급 폐열원을 발전할 수 있는 유력한 방안으로 열전발전기술이 최근 부각되고 있다. 열전발전은 발전모듈의 변환효율이 7~10%이고, 시스템 효율은 5%내외로 증기발전에 비해서는 낮지만 기계적 가동부분이 없어 고장발생이 적고 기동정지가 용이하며 열이 있으면 바로 발전이 가능한 차세대 친환경 발전기술이다. 본 연구에서는 현재까지 시도, 개발되지 못한 $100^{\circ}C$에서 $400^{\circ}C$내외 온도영역인 중저온급 소각폐열 회수를 위한 목적으로 중온용 열전발전소재 및 모듈과 저온과 중온에 각기 대응하여 폐열발전의 효용성을 높인 복식열전발전시스템을 개발 중에 있다. 본 고에서는 현재까지 진행된 일부 연구내용들을 소개하고자 하였다.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.36 no.6
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• pp.620-626
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• 2023

Energy harvesting technology, which converts wasted energy sources in everyday life into usable electric energy, is gaining attention as a solution to the challenges of charging and managing batteries for the driving of IoT sensors, which are one of the key technologies in the era of the fourth industrial revolution. Hybrid energy harvesting technology involves integrating two or more energy harvesting technologies to generate electric energy from multiple energy conversion mechanisms. In this study, a hybrid energy harvesting device called TMPPEG (thermo-magneto-piezoelectric-pyroelectric energy generator), which utilizes low-grade waste heat, was developed by incorporating PVDF polymer piezoelectric components and optimizing the system. The variations in piezoelectric output and thermoelectric output were examined based on the spacing of the clamps, and it was found that the device exhibited the highest energy output when the clamp spacing was 2 mm. The voltage and energy output characteristics of the TMPPEG were evaluated, demonstrating its potential as an efficient hybrid energy harvesting component that effectively harnesses low-grade waste heat.