Analytical loss model of low voltage enhancement mode GaN HEMTs

An analytical model is proposed in this paper to calculate the switching loss of low voltage enhancement mode Gallium Nitride high electron mobility transistors (eGaN HEMTs). The switching process is illustrated in detail. The switching loss is obtained by solving the equivalent circuits during the switching transition. A good agreement is shown between the analytical model and Spice simulation results. In addition, in order to accurately measure the current transition waveform, a novel current measuring method based on magnetic coupling is proposed. Finally, a buck converter is designed to validate the accuracy of the proposed model.