NONE 20260715072426676 wseas/wseas content-registration-form@crossref.org content-registration-form International Journal of Electrical Engineering and Computer Science 2769-2507 Venkateswara Reddy Kunduru Department of Electronics and Communications Engineering M.B.T.S. Government polytechnic, Guntur, Andhra Pradesh, INDIA https://orcid.org/0000-0002-9567-1063 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. 07 15 2026 07 15 2026 73 6 https://creativecommons.org/licenses/by/4.0/deed.en_US 10.37394/232027.2026.8.6 https://wseas.com/journals/eeacs/2026/a12eeacs-006(2026).pdf M. Kumar, S. Banerjee, and A. Khaligh, “Highefficiency wide-input non-inverting buck–boost converter for renewable DC microgrid applications,” IEEE Trans. Power Electron., vol. 40, no. 1, pp. 112–124, Jan. 2025. L. Chen and R. Ortega, “Dynamic modeling and stability enhancement of PWM buck–boost DC– DC converters operating in CCM,” IEEE Access, vol. 12, pp. 144320–144333, Nov. 2024. A. Singh and V. Chatterjee, “Design and performance evaluation of high-gain buck–boost converters for EV battery systems,” IET Power Electron., vol. 17, no. 9, pp. 1085–1097, Sept. 2024 R. Das and G. Moschopoulos, “Soft-switched non-inverting buck–boost converters for highpower applications,” IEEE J. Emerg. Sel. Topics Power Electron., vol. 11, no. 4, pp. 5121–5132, Dec. 2023. H. Jiang, Z. Yu, and T. Qiao, “Improved control techniques for high-efficiency DC–DC converters in renewable energy systems,” Renew. Energy, vol. 212, pp. 1289–1301, July 2023. P. N. Enjeti and S. Kapat, “High-performance PWM control strategies for non-isolated DC–DC converters,” IEEE Trans. Ind. Electron., vol. 71, no. 5, pp. 5562–5575, May 2024.. S. Li, R. Wang, and D. Zhang, “Model predictive control for buck–boost converters with fast dynamic response,” Energies, vol. 17, no. 3, pp. 1452–1466, Feb. 2024. P. Shah and M. E. Elbuluk, “Design considerations for high-frequency DC–DC converters using GaN devices,” IEEE Trans. Power Electron., vol. 39, no. 10, pp. 11985– 11997, Oct. 2024. Y. Zhou and T. Wang, “A comparative study of non-inverting vs. inverting buck–boost converters for PV and battery systems,” Solar Energy, vol. 257, pp. 212–222, Apr. 2024. F. Campos and J. A. Pomilio, “Small-signal modeling and simulation of DC–DC converters using MATLAB/Simulink,” IEEE Latin America Trans., vol. 21, no. 6, pp. 987–995, Jun. 2023. A. R. Ayyanar, M. B. Shadmand, and S. Balachandran, “Advanced digital control techniques for non-isolated DC–DC converters in renewable energy systems,” IEEE Trans. Ind. Electron., vol. 72, no. 2, pp. 1548–1560, Feb. 2025. Y. Li, F. Blaabjerg, and H. Wang, “Highreliability design and lifetime prediction of DC– DC converters for power electronic applications,” IEEE Trans. Power Electron., vol. 39, no. 7, pp. 8234–8247, July 2024. M. S. Islam and K. Y. Lee, “Real-time modeling and simulation of buck, boost, and buck–boost converters using MATLAB/Simulink for education and research,” Energies, vol. 16, no. 19, pp. 7120–7134, Oct. 2023.