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dc.contributorDepartment of Electrical Engineeringen_US
dc.contributor.advisorYang, Yun (EEE)en_US
dc.creatorLi, Chenchen-
dc.identifier.urihttps://theses.lib.polyu.edu.hk/handle/200/12503-
dc.languageEnglishen_US
dc.publisherHong Kong Polytechnic Universityen_US
dc.rightsAll rights reserveden_US
dc.titleSoft switching techniques for driving circuits in wireless power transfer systemsen_US
dcterms.abstractWith the pursuit of green energy, electric vehicles have gradually entered people's lives. At present, electric vehicles are mainly charged by wired means. However, with the development of power electronics technology, wireless power transfer technology has gained people's attention. Compared with wired charging, the wireless power transmission system requires less maintenance and does not need to consider a series of losses caused by the grid's frequency, so it has more potential to improve efficiency. The main losses of the wireless charging system come from the losses between the coils and the losses of the energy conversion circuit. Coil losses can be reduced by replacing with higher-quality coils. The energy conversion circuit's loss is essentially the power device's switching loss, which can be reduced by soft switching technology. In this paper, the soft switching technology that can reduce the switching loss of WPT is taken as the research object, and the method of zero voltage switching (ZVS) is mainly studied. The main work and achievements of this paper are as follows:en_US
dcterms.abstractFirst, a better method of adding auxiliary circuits is suggested based on the conduction concept of the conventional phase-shifted full-bridge application. The inductors or capacitors used in the auxiliary circuits are designed. The improved soft-switching of the power circuit is then demonstrated through simulation and experiment and it confirms that the added auxiliary circuit can improve the soft-switching problem without impacting the performance of other components of the system, such as the control circuit.en_US
dcterms.abstractFinally, experiments are used to validate the load range and coil range corresponding to various auxiliary circuits. To preserve the circuit's maximum working efficiency in real-world applications, the auxiliary circuits of various gears can be automatically changed by keeping track of the position of the charging apparatus and the battery's condition.en_US
dcterms.extent62 pages : color illustrationsen_US
dcterms.isPartOfPolyU Electronic Thesesen_US
dcterms.issued2023en_US
dcterms.educationalLevelM.Sc.en_US
dcterms.educationalLevelAll Masteren_US
dcterms.LCSHWireless power transmissionen_US
dcterms.LCSHElectric vehicles -- Power supplyen_US
dcterms.LCSHSwitching power suppliesen_US
dcterms.LCSHHong Kong Polytechnic University -- Dissertationsen_US
dcterms.accessRightsrestricted accessen_US

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Please use this identifier to cite or link to this item: https://theses.lib.polyu.edu.hk/handle/200/12503