Design and construction of a two-way charger for electric vehicles based on a multi-output isolated flyback converter

نوع: Type: Thesis

مقطع: Segment: masters

عنوان: Title: Design and construction of a two-way charger for electric vehicles based on a multi-output isolated flyback converter

ارائه دهنده: Provider: Mostafa Torabzadeh

اساتید راهنما: Supervisors: Dr. Mohammad Mehdi Shahbazi

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Dr. Mohsen Hassan Babaei Nozadian, Dr. Younes Solgi

زمان و تاریخ ارائه: Time and date of presentation: 2025

مکان ارائه: Place of presentation: 30

چکیده: Abstract: This thesis focuses on the design and construction of a bidirectional charger for electric vehicles based on an isolated multi-output flyback converter. With the rapid growth of electric vehicles and the increasing demand for efficient charging systems, optimizing existing designs to achieve high efficiency and reduce energy losses has become crucial. Flyback converters are widely used in low-to-medium power applications due to their simplicity, low cost, and capability of electrical isolation. However, a major challenge with conventional flyback converters is the high switching losses caused by hard switching, which reduces efficiency and increases heat generation in the system. In this study, a quasi-resonant flyback converter is proposed to minimize switching losses, enhance efficiency, and improve overall system performance. The proposed converter incorporates both AC/DC and DC/DC stages to enable bidirectional energy transfer between the grid and the vehicle’s battery. The use of soft switching techniques significantly reduces electromagnetic interference (EMI), mitigates voltage and current stresses on switching components, and extends the lifespan of the components. The analysis presented in this thesis includes the operational principles of the flyback converter, the design of a resonant tank circuit to improve switching conditions, and the simulation of the proposed circuit using software tools such as MATLAB and PSPICE. The results demonstrate that the proposed design significantly reduces switching losses and enhances the system's efficiency compared to traditional flyback converters. Additionally, the proposed converter offers wide-range output voltage regulation and improved dynamic response under varying load conditions. One of the key achievements of this research is the reduction in manufacturing costs and improved circuit efficiency through the careful selection of components such as transformers, MOSFETs, diodes, and capacitors. These selections were based on detailed loss analyses and economic considerations, ensuring improved performance while reducing the overall system cost. The experimental results from the constructed prototype validate the proposed design, showcasing stable performance and high efficiency under various load and voltage conditions. In laboratory tests, the proposed converter achieved an efficiency of over 90%, representing a significant improvement compared to conventional designs. Finally, the recommendations provided in this study can serve as a foundation for future research on designing high-efficiency electric vehicle charging systems, reducing the size and weight of converters, improving reliability, and developing advanced control methods. Thus, the findings of this research can contribute to the development of innovative technologies related to electric vehicles and the improvement of energy infrastructure.

فایل: ّFile: Download فایل