Analysis and suppression of inductive interference in active integrated power electronics module

The interference between power stage and driver stage is one of the key points of a module design, especially for high power densities, where couplings are enlarged. This paper focuses on the suppression techniques for inductive coupling between them. As a demonstror, a 2kW single phase PFC active IPEM (Integrated Power Electronic Module), consisting of full bridge rectifier diodes, current sensing resistor and boost converter, has been developed employing CoolMOS and SiC diodes. The electromagnetic interference mechanism in the module is demonstrated. In order to reduce the voltage spike of power devices, three different design patterns are compared for reducing the parasitic self-inductance of critical loop. The approaches for reduction in inductive interference between power critical high di/dt loop and driver testing loop are investigated, including flux cancellation pattern for power high di/dt loop, reduction in electromagnetic interference source and inserting a copper shielding layer between them. Finally, the electrical design considerations are verified by the simulation and experimental results.