â—The development trend of modern power electronic devices -- Miniaturization, lightweight, and higher requirements for efficiency and electromagnetic compatibility. â— High frequency power electronics -- Reduced volume and weight of filters and transformers, and miniaturization and weight reduction of power electronic devices. -- Increased switching losses and increased electromagnetic interference. â—Soft switching technology -- Reduce switching losses and switching noise. -- Further increase the switching frequency. Wash Motor,Electric Wash Motor,Ac Electric Wash Motor,Washing Machine Motors WUJIANG JINLONG ELECTRIC APPLIANCE CO., LTD , https://www.jinlongmotor.com
Second, the basic concept of soft switch 
Third, the typical soft switching circuit 
Fourth, summary 