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RF 무선전력전송을 이용한 센서노드 배터리 충전용 전력획득모듈 연구 및 구현
정원재(Won-Jae Jung),박준석(Jun-Seok Park) 大韓電子工學會 2011 電子工學會論文誌-SC (System and control) Vol.48 No.6
USN환경에서 다양한 정보 수집을 위해 배치된 수많은 센서노드들의 배터리를 일일이 교체해 주는 것은 많은 시간과 비용이 소요된다. 이를 해결하기 위한 방안으로 본 논문에서는 센서노드 배터리 충전용 전력획득모듈을 제안한다. 센서모듈이 환경정보를 센싱하고 정보를 전송하는데 소모하는 전력과 자연 방전되는 배터리 전력을 보충하기 위해 전력전송모듈에서 전송한 RF 전력을 획득모듈에서 효과적인 획득 및 효율적인 전력관리를 통해 배터리에 충전한다. 획득된 전력은 배터리 전력을 일정한 레벨로 유지시켜 센서노드의 배터리 교체 주기를 반영구적으로 늘림으로써 USN 산업의 신뢰성과 적용가능성을 높이고 USN 산업 활성화에 기여할 수 있다. 본 논문에서는 RF 무선전력전송 시스템을 이용하여 전력전송/획득모듈간 5 m의 거리에서 입사된 10 dBm의 전력을 4.2 V의 1 ㎃ 이상의 전류로 센서노드용 리튬폴리머 배터리에 충전하는 실험을 거쳐 시스템을 검증하였고 센서노드의 배터리 소모전류와 센싱정보 송신주기를 무선으로 충전할 수 있는 전류량과 비교하였다. With the progress of USN technology fields to which wireless sensor node is applicable are increased under a condition that it holds a lot of problems to solve for betterment. One of the problems which acts as an obstacle to USN industry diffusion is the wireless sensor node battery exchange to their individual life cycle. Exchanging the battery of so many sensor nodes one by one requires a great deal of times and costs. Such problem is against the convenience supply -aim by applying USN technology. In this paper using RF wireless power transmission system that power transmission / harvesting module from a distance of 5 m and the power of 10 dBm with a current of 1 ㎃ or more for Sensor Nodes in lithium-polymer battery charging system tested and verified.
프레스 포밍 머신의 티타늄과 알루미늄 판재 성형성에 관한 연구
정원재(Won-Jae Jung),강한빈(Han-Bin Kang),이동욱(Dong-Wook Lee),박민혁(Min-Hyeok Park),송주한(Ju-Han Song),이석순(Seok-Soon Lee) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.5
Main function of the Press forming Machine is the forming for plates. The head of the Press forming machine consist of several parts. It was named Press forming_contraction and Press forming_expansion according to formability of plates. Aluminium and Titanum plates are forming by using the Press forming machine. In this study, we analyzed sheet metal forming including plastic deformation and the contact pressure in the bearing. Finite element analysis results of Press forming_contraction and Press forming_expansion show the similar results of the actual specimen plates and the bearing contact pressures show the acceptable level of stress in both aluminum and titanium specimens.
정원재(Won-Jae Jung),임세미(Se-Mi Lim),박태준(Tae-June Park),홍석민(Seok-Min Hong),김진섭(Jin-Sup Kim),박준석(Jun-Seok Park),채형일(Hyung-il Chae) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.11
This paper presents a hall device structure for improve hall sensor sensitivity using in a CMOS process. Hall device sensitivity is proportional to hall current (inverse proportional to magnetic filed and bias current). The hall current presented by (RS + 3RD)/RS × RD from equivalent circuit. The proposed cross shaped hall device has a low RS, and high sensitivity. The proposed hall device is simulated in a 3-dimensional model simulator in COMSOL Multiphysics, with 0.35 μm CMOS process parameters. The hall device prototype fabricated in 0.35 μm CMOS process. The measurement result is as following: the maximum sensitivity is approximately 12.6 %/T @ 20mT and 12 μA bias current.
고효율 마이크로파 무선 전력 수신 집적회로 설계 및 구현
정원재(Won-Jae Jung),정효빈(Hyo-Bin Jung),김상규(Sang-Kyu Kim),장종은(Jong-Eun Jang),박준석(Jun-Seok Park) 대한전기학회 2013 전기학회논문지 Vol.62 No.8
Wireless power transmission technology has been studied variety. Recently, wireless power transmission technology used by resonance and magnetic induction field is applied to various fields. However, magnetic resonance and inductive coupling are have drawbacks - power transmission distance is short. Microwave transmission and accept techniques have been developed to overcome short distance. However, improvement in efficiency is required. This paper, propose a high-efficiency microwave energy acceptor IC(EAIC). Suggested EAIC is consists of RF-DC converter and DC-DC converter. Wide Input power range is -15 dBm ∼ 20 dBm. And output voltage is boosted up to 5.5 V by voltage boost-up circuit. EAIC can keep the output voltage constant. Available efficiency of RF-DC converter is 95.5 % at 4 dBm input. And DC-DC efficiency is 94.79 % at 1.1 mA load current. Fully EAIC efficiency is 90.5 %.
정원재(Won-Jae Jung),박민혁(Min-Hyeok Park),최진규(Jin-Kyu Choi),남광식(Kwang-Sik Nam),조상(Zhao Shang),이재형(Jae-Hyung Lee),이석순(Seok-Soon Lee) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.4
Roll forming technology has a problem in that it depends only on experience without accurate data in the actual field. To solve this problem, it is necessary to procure accurate data during the roll forming process. To this end, we determined the operating force and the material thickness by implementing several changes to those variables during an experiment. This study compares the FEA results and experimental results. Experimental results were used for the basic data of the design. The FEA results show that the roll forming machine is operating accurately and safely. And, a comparison of the results shows that the design of the automatic roll forming machine is operating in the right way. This design of an automatic roll forming machine will be helpful for many areas of the industry.
정원재(Won-Jae Jung),조영빈(Young-Bin Cho),김병수,강민수(Min-Soo Kang),고대식(Dae-Sik Ko) 한국정보기술학회 2003 Proceedings of KIIT Conference Vol.2003 No.-
In this paper, a novel resonator is designed using the resonant characteristic of the defected ground structure(DGS). To confirm the validity of the designed DGS resonator, two kinds of oscillators using DGS resonator and λ/4 microstrip line have been designed and measured in the same configuration except for the configuration of the resonator for the examination of the reduction of phase noise by the DGS. At the fundamental frequency of 8.6㎓, 4.83 ㏈ output power and -91.7 ㏈c @100㎑ phase noise have been measured for oscillator with DGS resonator, and 5㏈m output power and -72.78㏈c @100㎑ phase noise have been measured for one with λ/4 micros trip line. Measurement shows reduced phase noise by 18.92 ㏈ in oscillator with DGS resonator compared to one with λ/4 microstrip line.