Research purposes: By researching and developing differential current transducer used for leakage detecting, to adapt the ground protection of traction inverter in localization type a metro vehicle.
研究目的：研制开发用于漏电检测的差动电流传感器，以适应国产化a型地铁车辆的牵引逆变器接地保护的要求。
Constant-current-type inverter power overcome this shortcoming.
恒流式逆变电源克服了这一缺点。
The direct type single-phase 5-level and three-phase 5-level current source inverter topology can be developed to 7-level and higher level.
对单相直接式5电平和三相直接式5电平拓扑进行拓展，拓展到7电平以及更到的电平。
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