Comparison of thermal performance between parallel MOSFETs and IPM

In this paper, aiming at the heat dissipation problem of power module in miniaturization of motor controller, a parallel MOSFET scheme is designed to replace the integrated module IPM. It is found that the parallel MOSFETs can reduce the heat production of the system, have a smaller heat density, and have better thermal performance. Firstly, the switching time in the motor SVPWM control is analyzed, and the loss calculation method of MOSFET and IPM under different current conditions is introduced in detail. According to the calculated device loss and external heat dissipation conditions, the heat conduction network models of parallel MOSFETs and integrated module IPM are established. The thermal simulation is designed based on ANSYS software. The temperature rise experiment is carried out by means of motor pair dragging. The temperature difference between them is compared under the conditions of 100V DC bus voltage and 30A output current. The simulation and experimental results show that the thermal performance of the motor controller can be effectively improved by using the parallel MOSFET scheme under the same control effect and control ability. This provides technical support for Reliability Application of miniaturization of motor controller.