Soft switch of voltage can identify and select working bus intelligently by software, and switch the bus voltage immediately without any contact.
电压软切换通过软件智能识别、选择工作母线，完成母线电压快速无触点切换。
There are some problems about the secondary voltage switching between voltage transformers of double bus. To solve these problems, a new method, soft switch of voltage, was proposed in this paper.
针对双母线电压互感器二次电压切换存在的问题，提出了电压软切换的新方法。
Ways to improve the reliability of arc welding inverter power and the research condition of zero voltage, zero current soft switch inverter are introduced.
介绍提高我国弧焊逆变电源可靠性的途径以及零电压、零电流软开关变换研究现状。
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