Loss Model for Gallium Nitride DC-DC Buck Converter

In recent years, more research has been done on Enhancement Mode Gallium Nitride (eGaN) converters as the world is moving towards more power efficient converters. The process to make converters more efficient was bit complicated and slow in 20th century. With help of simulation tools such as MATLAB and LTspice, this process has become much faster and reliable in modern era. In order to make this process even faster, one of the important aspects in power electronics is to evaluate different losses in the converter. A model for estimating power losses for eGaN DC-DC buck converter (12V/1.2V) was created (figure 1). This loss model was calculated for different frequencies and compared experimentally, theoretically and in simulation. This research also investigates the constant variables which help realize the difference between theoretical and experimental losses of eGaN respect to output current.