Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Electrical and Electronic Engineering | en_US |
| dc.contributor.advisor | Liu, Wei (EEE) | en_US |
| dc.creator | Zhang, Xichen | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/14456 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | en_US |
| dc.rights | All rights reserved | en_US |
| dc.title | Advanced segmented-vector pulse frequency modulation for three-level converter based wireless power transfer system | en_US |
| dcterms.abstract | Three-level converters controlled by an advanced segmented-vector pulse frequency modulation (A-SVPFM) strategy are promising for high-power wireless power transfer (WPT). This dissertation proposes an A-SVPFM method and a dedicated digital modulator for a half-bridge flying-capacitor three-level converter. The modulator maps a continuous normalized voltage ratio into adjacent whole-wave pulses and preserves a zero-switching angle at the resonant frequency across the control range, enabling zero-voltage switching (ZVS) with wide-range | en_US |
| dcterms.abstract | A switching-state selection scheme that uses only voltage sampling is further introduced to regulate the flying-capacitor voltage, avoiding current sensors while maintaining small ripple around the reference. | en_US |
| dcterms.abstract | On the analysis side, the Fourier series of the system output-voltage is formulated and the harmonic structure induced by the finite modulation period is clarified; discrete Fourier transform (DFT) is then employed to compare A-SVPFM with pulse frequency modulation (PFM), showing a markedly lower transmitter-current total harmonic distortion (THD) under the band-pass input impedance of the WPT link. | en_US |
| dcterms.abstract | Moreover, a closed-form ZVS condition is derived that links the required transmitter-capacitance offset, dead time, and load, providing practical design guidance. | en_US |
| dcterms.abstract | The effectiveness of the proposed scheme is validated by software simulations and hardware experiments on a three-level WPT prototype. | en_US |
| dcterms.extent | v, 33 pages : color illustrations | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2026 | en_US |
| dcterms.educationalLevel | M.Sc. | en_US |
| dcterms.educationalLevel | All Master | en_US |
| dcterms.accessRights | restricted access | en_US |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 8885.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.17 MB | Adobe PDF | View/Open |
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