Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Electrical and Electronic Engineering | en_US |
| dc.contributor.advisor | Chau, K. T. (EEE) | en_US |
| dc.creator | Shang, Zhenyu | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/14454 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | en_US |
| dc.rights | All rights reserved | en_US |
| dc.title | Multilevel inverter based wireless power transfer | en_US |
| dcterms.abstract | In high-power wireless charging systems for electric vehicles, flying capacitor multilevel inverters (FCMLIs) offer promising performance but suffer from critical stability issues when relying on closed-loop control based on ADC sampling. Sampling failure or noise can cause capacitor voltage imbalance, leading to circuit-level instability and potential topological collapse. To address this challenge, this paper proposes a five-level FCMLI topology featuring wide-range output voltage control under Pulse Magnitude Modulation (PMM), derived from Delta-Sigma principles. A topology-level passive capacitor voltage self-balancing mechanism is implemented using a hybrid clamping circuit and open-loop modulation strategy, eliminating the dependence on real-time feedback. Furthermore, it is identified that PMM may cause limit-cycle oscillations, which further induce capacitor imbalance. To mitigate this, a dithering method adapted from communication systems is introduced to suppress limit cycles and enhance system stability. The proposed system is validated through theoretical analysis, simulation, and experimental tests at 200V, demonstrating enhanced modulation stability, robust voltage balancing, and high output controllability without reliance on closed-loop ADC feedback. | en_US |
| dcterms.extent | x, 66 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 | |
|---|---|---|---|---|
| 8883.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 6.16 MB | Adobe PDF | View/Open |
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