Because the power circuit structure driven by single or three-phase motor has been quite mature and stable, the power module integrating the power switch and driving circuit of this part has had a revolutionary impact on the concept of frequency converter system design after its introduction. With the maturity of module packaging technology and the rapid decline of cost,There is a trend to gradually replace traditional components and become the mainstream of system design.This integrated power module has a name with high liquidity, which is called integrated / intelligent power module, which is abbreviated as IPM [1].Unfortunately, most designers still regard such components as a black box. They either abandon them for fear of being unable to grasp the problems that may arise from them, or they can only accept the influence of some leading manufacturers and form some specious concepts.However, neither the former nor the latter believe that designers should hold an attitude towards the trend of power integrated packaging. Only by selecting the design concept with competitive advantage and fully mastering the characteristics and limitations of the components used can we ensure that they will not be eliminated by the rapidly changing market.