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신지영,손영석,차득근,이철균,황이철,Shin, Jee-Young,Son, Young-Seok,Cha, Duk-Guen,Lee, Cheol-Gyun,Hwang, I-Cheol 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.8
The objective of this study is to investigate the aerodynamic characteristics of a vertical axis wind turbine blade as the basic study of a design of a vertical axis wind turbine. The lift and drag coefficients of the various shape of the vortical axis wind turbine blades are analyzed and compared using the CFD code Fluent. To validate the numerical analysis, the predicted results of the Fluent are compared with those of the Xfoil code and the experimental results. We conclude that the program Fluent can be used to predict the aerodynamics of the wind turbine blade. By comparing the predicted results of the aerodynamic characteristics of the different shape of the blades, an appropriate shape of the blade is suggested to design the vortical axis wind turbine blade.
에너지 회생 방식 스너버 회로를 갖는 3상 GTO PWM 인버터
신병철(Shin-byung chul),강경호(Kang-kyung ho),차재현(Cha-jae hyun),차득근(Cha-duk guen),김명현(Kim-myung hyun) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
This paper is proposed three phase GTO PWM Inverter with energy recovery snubber circuit. The proposed energy recovery snubber circuit is effective in reduction of the power loss in the Inverter system than asymmetry GTO snubber circuit.<br/> <br/>
李良雨,車得根 東義大學校産業技術開發硏究所 1992 産業技術硏究誌 Vol.6 No.-
This paper describes the basic starting methods of the current source type static thyristor inverter circuit, which have been developed specifically for induction heating applications. These type of the auxiliary thyristor methods (1) (2), auxiliary DC source method, series capacitor short type method and composite starting methods described constitute a complete and compatible line of static frequency converters, capable of meeting the needs of virtually all practical induction heating applications, requiring frequencies from 180 Hz up to 5 KHz, at power levels from 5 KW to 500 KW upwards.
MOS-FET를 利用한 電流形 高周波 誘導加熱裝置에 관한 硏究
차득근 東義大學校産業技術開發硏究所 1995 産業技術硏究誌 Vol.9 No.-
This paper presents the features, technology and construction of a power MOS-FET current source inverter(CSI) type for induction heating operation over the 60~70KHz frequency range. This type 1KW output power generator, allows replacement of the electronic tube generators for most their applications. The most outstanding advantages of this CSI type generator with respect to tube generators are more energy effciency, extended life, reduced size. Separated heating station of the generator, and connection by flexible cable.
Half-Bridge 공진형 인버어터를 이용한 고주파 유도가열기의 특성해석에 관한 연구
차득근 東義大學校 産業技術開發硏究所 1997 産業技術硏究誌 Vol.11 No.-
This paper presents the description, analysis of a half-bridge resonant-type inverter suitable for heating magnetic materials in the 350kHz∼500kHz range MOS-FETs were employed as the switching devices. The main equivalent circuit are consisted of the series-parallel resonance circuit with half-bridge MOS-FET inverter system. While the output current of the inverter is nonsinusoidal waveform, the current of the heating coil appears sinusoidal waveform. Therefore this system appears series resonant charact- eristics under the condition of 350kHz∼500kHz range. Among waveforms of the simulation the output voltage of the inverter has a high spike voltage, therefore in a practical system this power device resultly is forecasted to be damaged by heat.
尹炳道,李良雨,車得根 東義大學校産業技術開發硏究所 1990 産業技術硏究誌 Vol.4 No.-
This paper presents an analysis of the output voltage weveforms of the double sinusoidal modulated PWM inverter, and are studied on the driving characteristics trough the 3 phase induction motor using 6502 microcomputer. The double sinusoidal modulated waves are produced during the interval 4π/3[rad] for one cycle, and the switching loss can be reduced. The amplitude of fundamental wave of double sinusoidal modulated PWM inverter is 1.15 times higher than that of the sinusoidal PWM inverter, but the practical measured value by FFT analyzer is 1.13 times.
李良雨,車得根 東義大學校産業技術開發硏究所 1992 産業技術硏究誌 Vol.6 No.-
This paper investigates the problem of designing a compensating control for a linear multivariable system so that the closed-loop system behaves like a specified ideal system or model. Synthesis technique through linear optimal control theory is applied to a model following problem, for the plant which has contant disturbances. To meet the control objectives, a new type quadratic performance index is proposed and simplified the problem using linear regulator problem in which the integral quadratic error between the plant and model outputs is minimized. The optimal system constructed by this metod consists of the both of a feedback controller and a feedforward controller, and its step response can be satisfactorily kept close to that of the model without offset. A numerical example illustrates the efficiency of this system.
車得根,李良雨,宋光鎬,崔允赫 東義大學校産業技術開發硏究所 1991 産業技術硏究誌 Vol.5 No.-
本 硏究는 中周波數(1-5㎑)節圍의 誘導加熱器 또는 誘導爐에 적합한 電流形 單相 thyristor 인버어터의 開發에 관한 것으로 system의 制御回路, 앞선 力率角 制御回路 設計 및 thyristor turn-off time制御技術을 提示했으며, 竝列補償된 負荷回路(單相인버어터 포함)의 特性을 調査, 硏究한 것이다. 本 硏究의 結果, 開發한 system 裝置는 매우 만족할 정도였다.