Abstract: This paper presents the design, modeling, and simulation of a non-inverting buck–boost DC–DC converter based on specified operating conditions, including an input voltage of 12 V, an output voltage of 42 V, a load power of 21 W, and a switching frequency of 200 kHz. Theoretical analysis is performed to determine the duty cycle, inductor value, capacitor size, and expected steady-state waveforms under continuous conduction mode. The converter is then implemented and simulated in MATLAB/Simulink using ideal switching and passive components. The simulated inductor voltage, inductor current, switch current, diode current, capacitor current, and output voltage waveforms are compared with analytically derived theoretical waveforms to validate the model. Results show strong agreement between theory and simulation, demonstrating the accuracy of the derived component values and confirming proper buck–boost operation. This work provides a complete workflow—from analytical design to simulation validation—serving as a foundational study for further development of controlled DC-DC converter systems.

Keywords: Buck–Boost Converter, MATLAB/Simulink, DC–DC Conversion, PWM Control, Power Electronics, Voltage Regulation

Pages: 73-80

WSEAS Transactions on