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TMS320F2812 DSP와 스마트 파워모듈을 사용한 유도전동기 소형 벡터제어 시스템의 구현
임정규(Jeong-Gyu Lim),김석환(Seok-Hwan Kim),정세교(Se-Kyo Chung) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
This paper presents an implementation of compact vector control system for induction motor using a digital signal processor (DSP) and a smart power module (SPM). The DSP TMS320F2812 has most necessary functions for ac motor control in a single chip and SPM provides a compact power stage. The indirect vector control algorithm is implemented in the drive system using these devices. The developed system is applied by 0.8㎾ induction servo motor and the all functions are verified through the experiments.
Doxycycline(Vibramycin<sup>??</sup>)의 호흡기감염증(呼吸器感染症)에 대(對)한 임상적(臨床的) 효과(效果)
임정규(J.H. Lim),김명석(M.S. Ki),신상구(S.G. Shin),윤효인(H.I. Yoon),홍사악(S.A. Hong) 대한약리학회 1975 대한약리학잡지 Vol.11 No.2
Pan-Korean multi-center trial of doxycycline in the treatment of upper and lower respiratory infection was carried out in the summer(from May to October) of 1975. A total of 204 patients between the ages of 3 and 75 was treated by 37 physicians including the internal medicine, pediatrics and ENT specialist in 17 general hospitals and 2 private clinics all-over the country. The dosage recommended was 200 mg on the first day of therapy followed by 100 mg daily thereafter. The pediatric dosage was 4 mg/kg on the first day and then 2mg/kg on each successive day. The subjective and objective signs of respiratory infection such as temperature, cough, sputum, pain and associated inflammatory symptoms were assessed using the carefully designed protocols and it showed rapid improvement by the fifth day (80%) of therapy. Only minor side-effects were reported and these were mild and mainly limited to gastrointestinal tract. The overall evaluation of the trial showed that 170 patients(83.3%) had a very good or good result, 13 patients (6.4%) a moderate and another 13 patients (6.4%) a negative result.
임정규(Jeong-Gyu Lim),서은경(Eun-Kyung Seo),정세교(Se-Kyo Chung),이현우(Hyun-Woo Lee) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
Of all the proposed resonant techniques, the well-known phase-shifted full bridge converter remains one of the most attractive because it offers an easy way of achieving ZVS with a minimum of extra components added, which is essential for the high power applications. This paper describes the design of a digital controller for a Phase Shifted Full-bridge PWM Converter. The small-signal model is derived incorporating the effects of phase-shift control and the utilization of the transformer leakage inductance and power FET junction capacitances to achieve the zero-voltage resonant switching. Based on the derived small-signal model, the digital controller is designed in the discrete domain. The performance of designed controller is verified through the simulation.
임정규(Jeong-Gyu Lim),임수현(Soo-Hyun Lim),신휘범(Hwi-Beom Shin),정세교(Se-Kyo Chung),이현우(Hyun-Woo Lee) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
This paper presents the design and implementation of a digital control system for a Phase Shifted Full-Bridge PWM Converter. The digital control of Phase Shifted Full-Bridge PWM Converter provides many advantageous of easily generating various phase-shift timing and implementing a complex voltage and current control algorithm. Based on the derived small-signal model, the digital controller is designed in the discrete domain. The designed digital controller implemented using the DSP TMS320F2812. The performance is proved through the experimental results.
Intelligent Power Module의 플로팅 게이트 전원 공급을 위한 전하 펌프 회로의 설계
임정규(Jeong-Gyu Lim),김석환(Seok-Hwan Kim),서은경(Eun-kyung Seo),정세교(Se-Kyo Chung) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
A bootstrap circuit for floating power supply has the advantage of being simple and inexpensive. However, the duty cycle and on-time are limited by the requirement to refresh the charge in the bootstrap capacitor. Hence, this paper deals with a design of charge pump circuit for a floating gate power supply of an IPM. The operation of the proposed circuit applied by three-phase inverter system for driving induction motor are verified through the experiments.
마이크로터빈/영구자석 동기발전기(MTG/PMSG)의 최대출력 벡터제어
임정규(Jeong-Gyu Lim),김무현(Mu-Hyun Kim),정세교(Se-Kyo Chung),송유진(Yu-Jin Song) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
This paper presents a vector control method to obtain the maximum output power Microturbine/permanent magnet synchronous generator(MTG/PMSG). The torque characteristics of PMSG are analyzed and equations related with a maximum torpue per ampere is derived. Finally, the conditions of a ratio of a maximum torque per ampere and a maximum output power are proposed.
Al-xMg-CNT 복합분말체의 용융특성에 미치는 마그네슘 첨가와 온도의 영향
임정규 ( Jung Kyu Lim ),최경환 ( Kyong Hwan Choe ),김상섭 ( Sang Sub Kim ),조규섭 ( Gue Serb Cho ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.4
We conducted melt-down experiments on Al-xMg-carbon nanotube (CNT) complex powder compacts at 700℃ and 800℃ for carrying the CNTs into the molten Al7021 matrix alloy. The parameters in the melting experiments were the holding temperatures and the amount of Mg content. The microstructures of the melt-down compacts were observed by optical microscopy (OM) and field emission scanning electro-microscopy (FESEM). The several phases obtained from the reaction products within the Al-xMg-CNT compacts were identified by energy dispersive X-ray spectroscopy (EDXS) and X-Ray diffractometry (XRD). The complete melt-down area was increased due to a large addition of Mg in the compacts and outer areas remained as undissolved powder compacts due to the large number of oxidation products such as MgO, MgAl2O4 and Al2O3. CNTs were observed on the surface of Al powders with oxidation products at 700℃ in a melting experiment. However, at 800℃, the CNT agglomerates moved away from the center because of the poor wettability and low density of the CNTs.