Technologies for Efficient Wide Voltage Gain Variation in DC-DC and AC-DC Resonant Converters
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Authors
Forouzesh, Mojtaba
Date
2024-10-04
Type
thesis
Language
eng
Keyword
Resonant Converter , Single-Stage AC-DC converter , Phase-Modular Three-Phase , LLC , Wide Voltage Gain Variation , Interleaved DC-DC Converter , Power Balancing , Switch-Controlled Capacitor , Synchronous Rectification , Auxiliary Power Module
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Abstract
This thesis focuses on developing advanced, high-efficiency DC-DC and AC-DC power converters for applications that require a wide range of voltage adjustments, such as data centers and electric vehicles (EVs). It introduces new designs, methods, and control strategies that overcome the limitations of traditional power converters and offers significant improvements for industries like telecommunications and automotive.
The main contributions include a new interleaved LCLC resonant converter, which ensures precise sharing of electrical current across different input voltages. This is achieved through a detailed analysis of how small variations in components affect performance. Another innovation is a novel resonant tank design for a two-phase LLC converter, specifically for auxiliary power modules (APMs), which simplifies control and lowers costs compared to traditional designs. Additionally, a new phase-modular three-phase AC-DC converter is proposed, using single-stage LLC converter modules. This design offers significant improvements in efficiency and power density over the commonly used two-stage systems.
The thesis also introduces an accurate design method for the three-phase AC-DC converter, using time-domain modeling to reduce energy losses and improve efficiency. A new control method is proposed for high output voltage AC-DC converters, using a microcontroller instead of the usual integrated circuits used for low output voltage conditions. Furthermore, a power balancing method with integrated power factor correction (PFC) is presented, ensuring high performance even in systems with unbalanced three-phase voltages, while minimizing the need for large output capacitors.
These contributions are supported by thorough analysis, including computer simulations and experimental results, which validate the proposed designs and demonstrate their practical applications. The solutions presented improve system complexity, ease of implementation, manufacturability, cost, and performance, particularly in terms of efficiency and power density. Overall, this thesis advances the understanding of resonant converter technologies and demonstrates practical innovations that could shape future designs in power conversion.
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Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada
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ProQuest PhD and Master's Theses International Dissemination Agreement
Intellectual Property Guidelines at Queen's University
Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.