Simulation of Linear and Nonlinear Single-Switch Single-Input Dual-Output Buck Converter

The transition to renewable energy requires efficient power conversion systems to maximize energy utilization and integration. DC-DC converters play a crucial role in enhancing the efficiency and performance of renewable energy technologies. However, traditional converters face challenges such as high component count, bulky active and passive elements, limiting power density, and increasing control complexity. The inductor is known as the bulkiest element in the circuitry; increasing the frequency will minimize the size of the inductor. However, a higher frequency will cause an increase in electromagnetic interference (EMI). Hence, the selection of the material for an inductor is crucial. This study observes the performance of a single-switch single-input dual-output (SS-SIDO) buck converter with linear and nonlinear inductors. The 4 C 65 NiZn magnetic material is selected for the nonlinear inductor model to further optimize the converter's performance. This material offers a wide frequency range, which can reduce the inductor size while maintaining efficiency. The Gyrator-Capacitor (GC) model is implemented to analyze the behavior of 4C65 NiZn. The findings reveal nonlinear behavior, with broader current ranges and increased fluctuations due to the nonlinear characteristics of the inductor, compared to the linear case. Despite these variations, the converter successfully maintains stable output voltages. The nonlinear inductor with 4 C 65 NiZn for the SS-SIDO buck converter operates efficiently across a broad frequency range. The voltage mode control (VMC) with a proportional-integral (PI) controller is used to regulate output voltages effectively.