Sep 16, · Rackham no longer requires dissertations to be prepped for printing. However, some departments still do. If your department requires you to prepare your dissertation for printing, you will have to alter the placement of the page numbers on your landscape pages. Delete the page numbers from the footer of the landscape section Two techniques to deal with hold up time issue are discussed in this dissertation: range winding solution and asymmetric winding solution, the efficiency at normal operation point could be improved with these methods. To reduce secondary rectifier conduction loss, QSW synchronous rectifier is developed, which also helps to achieve ZVS for Nov 21, · Video tutorials from the Library. It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as
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Thank you for your patience. pdf pdf 2. pdf 1. pdf 3. pdf 4. Date Metadata Show full item record. Abstract With the fast advance in VLSI technology, smaller, more powerful digital system is available. It requires power supply with higher power density, lower profile and higher efficiency.
PWM topologies have been widely used for this application. Unfortunately, hold up time requirement put huge penalties on the performance of these topologies. Also, high switching loss limited the power density achievable for these topologies. Two techniques to deal with hold up time issue are discussed in this dissertation: range winding solution and asymmetric winding solution, the efficiency at normal operation point could be improved with these methods. To reduce secondary rectifier conduction loss, QSW synchronous rectifier is developed, which also helps to achieve ZVS for symmetrical half bridge converter.
To achieve the targets, topologies with high switching frequency and high efficiency must be developed. Three resonant topologies: SRC, PRC and SPRC, are been investigated for this application because of their dissertation lib of low switching loss. Unfortunately, to dissertation lib with hold up requirement, none of them could provide significant improvements over PWM converter. Although the negative outcome, the desired characteristic for front end application could be derived.
Base on the desired characteristic, a thorough search is performed for three elements resonant tanks. LLC resonant topology is found to posses the desired characteristic. With doubled switching frequency, efficiency of LLC resonant converter is still far better than PWM converters, dissertation lib. To design the power stage of LLC resonant converter, DC analysis is performed with two methods: simulation and fundamental component simplification, dissertation lib.
Magnetic design is also discussed. The proposed integrated magnetic structure could achieve smaller volume, higher efficiency and easy manufacture. To make practical use of the topology, over load protection is a critical issue. Three methods to limit the stress under over load situation are discussed. With these methods, the converter could not only survive the over load condition, but also operate for long time under over load condition.
Next small signal characteristic of the converter is investigated in order to design the feedback control. For resonant converter, state space average method is no longer valid.
Two methods are dissertation lib to investigate the small signal characteristic of LLC resonant converter: simulation and extended describing function method.
Compare with test results, dissertation lib, both methods could provide satisfactory results. To achieve both breadth and depth, dissertation lib, two methods are both used to reveal the myth.
With this information, compensator for feedback control could be designed. Collections Doctoral Dissertations []. Search VTechWorks. This Collection, dissertation lib. VTechWorks About Policies Help. Log in Register, dissertation lib. View Usage Statistics.
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