Please use this identifier to cite or link to this item:
http://hdl.handle.net/11375/22224
Title: | Three-Phase Dual Active Bridge Converter: Design Considerations and Planar Transformer Design |
Authors: | Cui, Ying |
Advisor: | Emadi, Ali |
Department: | Electrical and Computer Engineering |
Publication Date: | 2017 |
Abstract: | This thesis discusses comprehensive design considerations for the three-phase dual-active-bridge (DAB) converter and presents a planar transformer design for the three-phase DAB converter used in smart home applications. An overview of the planar transformer, including magnetic cores, planar windings as well as its advantages and disadvantages are presented first. The review on analysis of transformer losses, leakage inductance and stray capacitance provides a guideline for transformer design. The operating principle of three-phase DAB converter is presented and the closed form expression of zero-voltage-switching (ZVS) condition, current stress of switching devices and DC link capacitors are obtained. Analytical results are applied in the parameter design of the DAB converter. A new design method for the three-phase DAB converter parameter selection is proposed. A new parameter fL is defined to simplify the analysis from three dimensions (n, f, Lk) to two dimensions (n, fL), from which the feasible value of n is determined. Together with the constraint of transformer design, the effective operating area (EOA) of f and Lk is obtained. The main losses that vary with the selectable parameters are studied and the corresponding converter efficiency is presented at different voltage and power levels. The parameters (n, f, Lk) are determined based on the comprehensive parameter design considerations of the three-phase DAB converter. A planar transformer for the three-phase DAB converter is designed based on the mathematical analysis and finite element analysis (FEA). The parameters that determine core selection are derived for the three-phase DAB converter. The winding design is accomplished using the FEA simulations. The impacts of different winding structures on the AC resistance, leakage inductance and stray capacitance are investigated, and the fully-interleaved design is selected for its low resistance and structural simplicity. The planar transformer prototype is built and tested in a three-phase DAB converter. The experimental waveforms at different voltage levels and power ratings demonstrate the effectiveness of the converter and transformer. The converter ZVS behavior and efficiency performance are measured, which validate the analysis. |
URI: | http://hdl.handle.net/11375/22224 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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Cui_Ying_final_submission_2017_August_Master.pdf | 3.07 MB | Adobe PDF | View/Open |
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