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자기-기계-전기 변환소자를 이용한 에너지 하베스팅 기술
황건태,류정호,윤운하 한국전기전자재료학회 2021 전기전자재료학회논문지 Vol.34 No.5
The internet of things (IoT) technology is a key component for the advent of 4th industrial revolution, which is the network of home appliances, infrastructures, and vehicles to remotely investigate these systems. For the operation of compact IoT devices, batteries are widely used as electric power, and the limited lifetime of batteries inevitably leads to periodic replacement. Magneto-mechano-electric (MME) generators may be alternatives to batteries inside the IoT devices by converting stray magnetic field into electric energy, since we are always surrounded by ambient alternating current (AC) magnetic fields induced from electric power transmission lines everywhere. This article reviews the recent domestic research progress in highperformance MME generators and their application field for IoT and electronic devices.
자기-전기(ME) 복합체를 활용한 초미세 자기장 감지 기술
황건태(Geon-Tae Hwang),송현석(Hyunseok Song),장종문(, Jongmoon Jang),류정호(Jungho Ryu),윤운하(Woon-Ha Yoon) 한국세라믹학회 2020 세라미스트 Vol.23 No.1
Magnetoelectric (ME) composites composed of magnetostrictive and piezoelectric materials derive interfacial coupling of magnetoelectric conversion between magnetic and electric properties, thus enabling to detect ultra-low magnetic field. To improve the performance of ME composite sensors, various research teams have explored adopting highly efficient magnetostrictive and piezoelectric phases, tailoring of device geometry/ structure, and developing signal process technique. As a result, latest ME composites have achieved not only outstanding ME conversion coefficient but also sensing of ultra-low magnetic field below 1pT. This article reviews the recent research trend of ME composites for sensing of ultra-low magnetic field.
황건태(Geon-Tae Hwang),류정호(Jungho Ryu),윤운하(Woon-Ha Yoon) 한국세라믹학회 2021 세라미스트 Vol.24 No.3
Magneto-mechano-electric (MME) conversion composites composed of distinctive magnetostrictive and piezoelectric materials derive interfacial coupling of magnetoelectric conversion between magnetic and electric properties, thus enabling energy harvesting and magnetic sensing. To demonstrate highperformance MME composites and their applications, various research teams have studied tailoring device structures, enhancing material properties, and developing MME application system. This article reviews the recent research progress of MME composites for energy harvesting and magnetic sensing.
COMSOL Multiphysics를 활용한 캔틸레버 형태의 압전 에너지 하베스터 구조 해석 시뮬레이션
곽민섭,황건태 한국전기전자재료학회 2021 전기전자재료학회논문지 Vol.34 No.6
In the 4th industrial age, electronic devices are becoming smaller and lighter with a low power consumption to overcome spatial limitation. The piezoelectric energy harvesters can convert mechanical kinetic energy into electric energy; thus, enabling the operation of small electronic devices. Recently, various piezoelectric harvesters have been reported and the electric output from these harvesters could be anticipated by theoretical analysis methods. For example, COMSOL Multiphysics software provides a theoretical simulation of piezoelectric effect with a combination of mechanical and electrical phenomena in the piezoelectric materials. This article introduces a brief modeling of piezoelectric harvester to investigate mechanical stress and electrical output of harvesting devices by the COMSOL Multiphysics software.
집속형 초음파 장치용 압전 세라믹의 소결특성에 미치는 CIP 효과
노상훈,김부안,황건태 한국동력기계공학회 2023 동력시스템공학회지 Vol.27 No.2
It was molded using cold isostatic pressure and then sintered to examine the impact of molding pressure on the sintering shrinkage rate, compressive strength, and relative permittivity on cylindrical-shaped PZT ceramics. As a result, the sintering shrinkage rate decreases with increasing molding pressure. Moreover, PZT ceramics with extremely high compressive strength and relative permittivity might be made by utilizing cold isostatic pressure molding. In particular, sufficient strength was guaranteed for compressive strength without post-heat treatment. The ideal sintering parameters for the PZT ceramic powder employed in this experiment are thought to be a forming pressure of 300 MPa and a sintering period of one hour. 냉간 정수압 장치를 이용하여 성형 소결한 PZT 세라믹스에 대하여 성형 압력이 소결 수축률, 압축강도, 비유전율에 미치는 영향을 조사하였다. 냉간 정수압 장치의 성형 압력이 증가할수록 소결수축률은 감소하였다. 냉간 정수압에 의해 매우 높은 압축강도와 비유전율을 띠는 원통형 PZT 세라믹스를 제조할 수 있었는데, 특히 압축 강도는 소결이 끝난 후 추가적인 열처리를 하지 않아도 충분히높은 강도가 확보되었으며, 300 MPa의 성형압력과 1시간의 소결 시간이 가장 이상적인 소결 조건이었다.
강자성-강유전성 복합체를 활용한 자기-기계-마찰전기 변환 발전소자
임예슬 ( Yeseul Lim ),황건태 ( Geon-tae Hwang ) 한국전기전자재료학회 2024 전기전자재료학회논문지 Vol.37 No.1
The Internet of Things (IoT) device is a key component for Industry 4.0, which is the network in homes, factories, buildings, and infrastructures to monitor and control the systems. To demonstrate the IoT network, batteries are widely utilized as power sources, and the batteries inevitably require repeated replacement due to their limited capacity. Magneto-mechanoelectric (MME) generators are one of the candidate to develop self-powered IoT systems since MME generators can harvest electricity from stray alternating current (AC) magnetic fields arising from electric power cables. Herein, we report a magnetomechano- triboelectric generator enabled by a ferromagnetic-ferroelectric composite. In the triboelectric nylon matrix, a ferromagnetic carbonyl iron powder (CIP) was introduced to induce magnetic force near the AC magnetic field for MME harvesting. Additionally, a ferroelectric ceramic powder was also added to the MME composite material to enhance the chargetrapping capability during triboelectric harvesting. The final ferromagnetic-ferroelectric composite-based MME triboelectric harvester can generate an open-circuit voltage and a short-circuit current of 110 V and 8 μA, respectively, which were enough to turn on a light emitting diode (LED) and charge a capacitor. These results verify the feasibility of the MME triboelectric generator for not only harvesting electricity from an AC magnetic field but also for various self-powered IoT applications.
최현수,류정호,윤운하,황건태 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.4
Energy storage capacitors based on dielectric ceramics with superior polarization properties and dielectric constant can provide much higher output power density due to their very fast energy charging/discharging rates, which are particularly suitable for operating pulsed-power devices. For an outstanding energy storage performance of dielectric capacitor, a large recoverable energy density could be derived by introducing a slim polarization-electric field hysteresis loop into dielectric materials by various technical approaches. Many research teams have explored various dielectric capacitor technologies to demonstrate high output power density and ultrafast charging/discharging behavior. This article reviews the recent research progress in high-performance dielectric capacitors for pulsed-power electronic applications.