Using GaN power ICs in a motor inverter application does offer multiple benefits, especially when it comes to reducing system cost. One of the biggest steps that can be taken is the removal of the heatsink, not only reducing the system size and weight, but also enabling the use of SMD-only components. With the complex mechanical assembly step in production removed, assembly cost is strongly reduced. This approach – based on silicon power components – was only possible up to a very limited output power range, but with GaN power ICs this is now doable up to much higher motor powers, depending on the operating conditions in the application. This article explains the key differences with the example of a commercial 400W motor inverter for a consumer appliance, with a special focus on thermal design.
