2026-09-22T04:12:45Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/117842 2023-07-11 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Banerjee, Arijit 2022-12 application/pdf en text Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms The student, Anuj Maheshwari, accepted the attached license on 2022-12-07 at 15:02. The student, Anuj Maheshwari, submitted this Thesis for approval on 2022-12-07 at 15:14. This Thesis was approved for publication on 2022-12-09 at 10:20. DSpace SAF Submission Ingestion Package generated from Vireo submission #18770 on 2023-04-12 at 07:39:17 Modeling and design of an LLC resonant converter for a wide voltage conversion ratio applications Maheshwari, Anuj 2022-12-09 Llc Resonant Converter Wide-output Range Efficiency Power Density State-plane Analysis LLC Resonant converters provide soft-switching capabilities enabling high switching frequencies and high efficiency. A low-quality factor design operating below resonant frequency is preferred for wide voltage-gain applications to reduce the required range of operating frequencies. Phase-shift modulation can be used in conjunction with frequency modulation to further narrow the operating frequency range. A first harmonic analysis-based approach has high inaccuracies in estimating capacitor voltage, inductor current, and voltage gain, which are critical parameters to design the converter and estimate the losses when phase-shift modulation is employed. This thesis presents a state-plane-based modeling framework to accurately analyze the converter when both frequency and phase-shift modulation are used. The proposed model is then used to highlight the power density versus efficiency trade-off obtained by utilizing phase shift as an additional control variable for an electric vehicle battery charging application. The accuracy of the model is verified by experiments on a 10kW SiC-based prototype. Two converters are designed using the trade-off curve, one employing only frequency modulation and the other using both frequency and phase-shift modulation. These two converters achieve the same efficiency over the constant current battery charging mode but, the addition of phase-shift modulation reduces the transformer’s size by 22% and its weight by 28%. Thesis eng https://hdl.handle.net/2142/117842 Copyright 2022 Anuj Maheshwari M.S. Thesis Electrical & Computer Engr University of Illinois at Urbana-Champaign Electrical & Computer Eng