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조규민,Cho, Kyu-Min 대한전자공학회 1999 電子工學會論文誌, S Vol.s36 No.11
The dead time which is inserted in switching signals of PWM voltage source inverters distorts its output. As a result, the deviations of real fundamental voltage and phase compared with the reference are occurred. And also the harmonics on its output are increased. In this paper, numerical analysis of the distorted voltage on the output of inverter caused by switching dead time is performed. With the calculation results, the fundamental voltage gain and phase deviations according to the modulation index, load displacement factor and dead time are presented. PWM 전압형 인버터의 스위칭 신호에 삽입되는 데드타임은 인버터의 출력에 왜형을 발생시키다. 그 결과, 지령에 대비한 기본파분 전압의 크기 및 위상의 편차가 발생한다. 뿐만 아니라 인버터 출력에 고조파를 증가시킨다. 본 논문에서는 스위칭 데드타임에 기인한 인버터 출력의 왜형분 전압에 대한 수식적 해석을 수행하였다. 연산 결과로써, 전압변조율, 부하 기본파 역율 및 데드타임에 다른 출력 전압의 기본파 전압 이득 및 위상 편차를 나타내었다.
曺奎玟,徐末庸 영남이공대학 산업기술연구소 1995 産業技術硏究 Vol.8 No.-
: New synthetic fabrics are sensitive to heat and tension because they are made of microfibers . Low tension-type dyeing and finishing equipements are neede for dyeing and finishing of them. Thus, in this study aerodynamic technology was applied as a driving force of the fabrics to develope "GREEN-FLOW" Dyeing M/C which is lower bath ratio, lower tension, and environmental conservative type. Polyester charmeuse fabrics were dyed to compare developed machine with Luft-roto Dyeing M/C which is made by Thies Company, German. The test results were as follows: 1) The resits of color fastness tests showed that the fabrics dyed with both Luft-roto and GREEN-FLOW Dyeing M/C had above 4-5 of color fastness to washing, above 4 of color fastness to sublimation, and 5 of color fastness to rubbing. 2) The drapability of the fabrics was 0.294 in both cases. 3) In the case of the fabrics dyed with Luft-roto Dyeing M/C, the mean value of dE was 31.323 with 0.2176 of the standard deviation and that of K/S was 0.3666 with 0.0054 of the standard deviation. Dyeing uptake of the fabrics dyed with Luft-roto Dyeing M/C was somewhat higher than that dyed with GREEN-FLOW dyeing M/C. However, dyeing levelness of the fabrics dyed with GREEN-FLOW Dyeing M/C was higher than that dyed with Luft-roto dyeing M/C. 4) The results of handle tests for the fabrics dyed with both Luft-roto and GTEEN-FLOW dyeing M/C, showed that KOSHI was 6.08 and 6.12 NUNIERI was 6.39 and 6.55, FUKURAMI was 4.60/4.81, and THV was 426 and 4.40, respectively. 5) Fabric speed(yds/min.) of right and left tube of GREEN-FLOW Dyeing M/C was 471.5 and 499.0 with 16.53 and 13.06 of the standard deviation, respectively, while those of Luft-roto Dyeing M/C was 489.2 and 496.4 with 16.88 and 13.62 of the standard deviation respectively.
조규민,강완식,김남정,Jo, Gyu-Min,Gang, Wan-Sik,Kim, Nam-Jeong 대한전자공학회 2000 電子工學會論文誌-SC (System and control) Vol.37 No.3
PWM 전압원 인버터를 통상적인 스위칭 방법으로 동작시킬 때, 직류 전압원의 단락을 방지하기 위하여 스위칭 신호에 데드타임을 삽입한다. 이러한 데드타임은 인버터 시스템의 제어 성능에 좋지 않은 영향을 발생시킨다. 따라서 이 데드타임의 영향을 보상하는 것이 필요하다. 또한 이 데드타임의 영향을 근본적으로 방지할 수 있는 최선의 방법으로써 데드타임 최소화 스위칭 방법을 고려할 수도 있다. 본 논문에서는 데드타임 최소화 스위칭 방법의 하나인 새로운 스위칭 방법을 제안하였다. 제안한 스위칭방법에 의하면 전류 극성이 절환되는 경우에 있어서, 단 한 번의 매우 짧은 데드타임만이 적용된다. 적용되는 데드타임은 스위칭 소자의 턴오프 시간보다 짧거나 같다. 그리고 제안하는 방법은 인버터의 출력 전류를 제어하는 경우에 있어서는, 지령전류의 극성 정보에 의하여 구현될 수 있기 때문에 극성 절환 시점을 판단하기 위하여 실제 전류를 이용하는 경우에 비하여 레벨 검출의 난점, 노이즈 등등의 문제점을 해결하기 쉽다. In PWM voltage source inverters operated by conventional switching method, the dead time is inserted in switching signals to prevent tile short circuit of the DC voltage source. The dead time causes detrimental effects to the control performance of the inverter system. So we need to compensate the dead time effects. And the dead time minimization switching method can be considered as the best way to avoid the dead time effects fundamentally. In this paper, a new switching strategy is proposed which is a kind of dead time minimization switching methods. According to the proposed switching method, very short dead time is adopted in only once when the current polarity is changing. And the adopted dead time is equal to the turn off time of the swtiching device or shorter than it. As the proposed method can be done with the polarity information of the reference current in case that the output current of the inverter is controlled, it is easy to solve some problems in comparison with the case that the real current is used to get the polarity changing time; level detection difficulty, noise problem and so on