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A Modified Space-Vector PWM Inverter without Phase Current Sensors
Hyeong-Gil Joo,Hwi-Beom Shin,In-Hwan Oh,Myung-Joong Youn 한국정보과학회 1997 Journal of Electrical Engineering and Information Vol.2 No.4
A method of detecting the three phase currents for a voltage-fed pulse width modulated(PWM) inverter is proposed, where only one current sensor is utilized on the dc-link. The proposed method has the constant sampling time by employing the modified space-vector PWM technique which generates the rearranged switching pattern to detect a phase current from a dc-link current. Experimental results show that the proposed scheme provides a very good detection method of three phase currents without phase current sensors. This method is very simple and has small detection errors.
A Modified Sapce-Vector PWM Inverter without Phase Current Sensors
Joo, Hyeong-Gil,Shin, Hwi-Beom,Oh, In-Hwan,Youn, Myung-Joong The Korean Institute of Electrical Engineers 1997 Journal of Electrical Engineering and Information Vol.2 No.4
A method of detecting the three phase currents for a voltage-fed pusle width modulated(PWM) inverter is proposed, where only one current sensor is utilized on the dc-link. The proposed method has the constant sampling time by employing he modified space-vector PWM technique which generates the rearranged switching pattern to detect a phase current from ad dc-link current. Experimental results show that eh proposed scheme provides a very good detection method of three phase currents without phase current sensors. This method is very simple and has small detection errors.
정전압 변압기의 회로정수에 따른 특성 변화에 관한 연구
주형길(Hyeong-Gil Joo),한재원(Jae-Won Han) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
The constant voltage transformer(CVT) is a voltage regulator that has a high reliability, a good short circuit characteristic, a high input power factor, and a relative immunity to lightning strike. Moreover, this has a good line regulation without a voltage feedback control. In this paper, the characteristics of CVT for the changes of input voltage and other circuit parameters are investigated.
단일전류센서를 이용한 교류전동기 구동에서 전동기 상수동정과 그 오차
주형길(Hyeong-Gil Joo),신휘범(Hwi-Beom Shin),윤명중(Myung-Joong Youn) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
An estimation scheme is used for solving two practical problems of the single current sensor technique. To improve the effect of parameter uncertainties, the method that identifies motor parameters for AC motor drive systems using the single current sensor technique is presented. And, the parameter identification error and its cause are examined. It gives good performances for identifying parameters. and reconstructing phase currents.
스누버 전류를 고려한 개선된 SVPWM 인버터를 이용한 상전류센서없는 전동기 구동
주형길(Hyeong Gil Joo),신휘범(Hwi Beom Shin),안희욱(Hee Wook Ahn),윤명중(Myung Joong Youn) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
The single sensor technique reconstructing phase currents from the dc-link current without phase current sensors is proposed. When the duration of active vector is too short for the snubber current to reduce, the dc-link current including the snubber current gives large detection error The solution is presented by analyzing the snubber current and mollifying the switching sequences. This scheme is simple, requires only one sampling a period and has good results for detecting the phase currents