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摘要
The voltage transfer ratio in matrix converters can be enhanced by reducing the semiconductor switching interval, but this also reduces the waveform quality. An RB-IGBT drive circuit was developed to reduce the switching intervals and restrain the increase of the collector current stress as well as the collector-to-emitter voltage stress using 3-stage control method. Then, a 3-phase to 3-phase matrix converter was built based on 600 V/100A RB-IGBT to drive an induction motor. The commutation technique is a key issue in matrix converter technologies. Conventionally, the current-based 4-step commutation strategy is realized by using a current hall sensor to sense the current direction. However, at small currents, this method is not effective. In this design, the collector-to-emitter voltage is sensed to determine the directions of the output currents for the 4-step commutation strategy. Experimental results show that the current direction is more accurately determined using this method than with current hall sensors. The cost is also dramatically reduced and the reliability is enhanced.
- 出版日期2006
- 单位清华大学
