Modeling losses and stresses of high frequency power converters using SABER

To accurately predict the effects of parasitics on losses and stresses in high-frequency power converters, a SABER-based simulator has been developed. SABER is used to precisely model the large-signal behavior of the power converter and to calculate semiconductor losses and stresses. A separate program, which is linked with SABER, calculates the winding and core losses of the power transformer and the resonant and output filter inductor. This program models copper losses due to skin and proximity effects and uses measured data to calculate the core loss. The simulator is verified on a 50 W forward zero voltage switched multiresonant power converter operating at 2 MHz. The calculated efficiency and semiconductor stresses are in excellent agreement with the measured data. The simulator can be used iteratively to further enhance the accuracy of simulation