Single Current Sensor Technique considering a Snubber Current and a Modified SVPWM Inverter for AC Motor Drives

스누버 전류를 고려한 개선된 SVPWM 인버터를 이용한 상전류센서없는 전동기 구동

The single sensor technique reconstructing phase currents from the dc-link current without phase current sensors in 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 modifying the switching sequences. This scheme is simple, requires only one sampling a period and has good results for detecting the phase currents.