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웨어러블 디바이스에 사용될 수 있는 텍스타일 형 MPPT 회로 개발
최민기,이정욱,김주용,Choi, Minki,Lee, Joung Uk,Kim, Jooyong 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.4
In this paper, the development of a small-sized MPPT (maximum power point tracking) circuit and its application for maximum output conversion by a solar cell in commercialized wearable fashion is reported. Using the Texas Instruments BQ25570 Energy Harvesting IC programmable chip, we implemented a hybrid DC-DC converter circuit of boost and buck converters. We designed two types of charging methods. The first method was a USB direct charging method (5.0 V, 1.0 A) using the MCP-73 8-32-2ACI voltage regulator (step-down voltage). The second method was continuous energy harvesting with a MPPT function, using a 4 V or less low-power solar energy source. Based on the circuit design, we developed a CLT (copper lamination textile) technology, which can be used to develop a fabric using PCBs as substrate materials in electronic circuit application technologies for wearable devices. Although the circuit could not be bent completely, this textile substrate can be used for future research on wearable devices. We tested the operation and power conversion using the MPPT converter circuit as the power input for a low-power solar cell energy source under international standards for sun conditions.
최민기(Choi Minki),차지영(Cha Jiyung),김영근(Kim Younggeun),류근걸(Ryoo Kunkul) 한국산학기술학회 2004 한국산학기술학회 학술대회 Vol.- No.-
Display process has adopted RCA clean, being applied to large area and coped with environmental issue for last ten years. However, the approaching concept of ozonized, hydrogenised, or electrolyzed water cleaning technologies is within RCA clean paradigm. In this work, only electrolyzed anode water was applied to clean particles and organics as well as metals based on Pourbaix concept, and as a test vehicle, MgO particles were introduced to prove the new concept. The electrolyzed anode water is very oxidative with high oxidation reduction potential(ORP) and low in pH of more than 900mV and 3.1, respectively. MgO particles were immerged in the anode water and its weight losses due to dissolution were measured with time. Weight losses were in the ranges of 100 to 500 micrograms in 250ml anode waters depending on their ORP and pH. Therefore it was concluded that the cleaning radicals in the anode water was at least in the range of 1 to 5E20 ea per 250 ml anode water equivalent to 1E18 ea/cm3. Hence it can be assumed that the anode water be applied to display cleaning since 1E10 to 1E15 ea/cm3 ranges of contaminants are being treated. In addition, it was observed that anode water does not develop micro-roughness on hydrophobic surface while it does on the native silicon oxide.