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The Topology and Voltage Regulation for High-power Switched-capacitor Converters

Zou, Ke
http://rave.ohiolink.edu/etdc/view?acc_num=osu1343668215

Abstract Details

2012, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
With the rapid advancement of wide band-gap device researches, the switched-capacitor topologies have attracted more and more attentions, due to its inductor-less feature and high-temperature operation capability. This dissertation presents a series of work on high power switched-capacitor converters, including the study on both the topologies and voltage regulation methods for high-power switched-capacitor converters. A modular cell-based switched-capacitor topology is first presented, which can be configured to realize both dc-dc and dc-ac power conversions. When used in dc-dc applications, this topology has the advantages of reduced input current ripple and minimized output capacitor size compared to traditional switched-capacitor topologies. When used in dc-ac conversions, a multi-level inverter topology can be realized based on the proposed cell structure. With a variable-frequency control method, the zero-current-switching is achieved over the entire fundamental cycle. To reduce the power loss, especially the conduction loss on the input capacitors due to the pulsing input current, a voltage tripler that can realize input current and output voltage interleaving is presented. Three identical stages exist in the proposed topology, with a 120 degree phase-shift between each two stages. A two-step charging scheme is utilized to realize the interleaving function. Both the conduction losses and switching losses can be minimized by using this topology. To efficiently regulate the output voltage of high-power switched-capacitor converters, a voltage regulation method is proposed, in which a RCL equivalent circuit of the capacitor charging loop is adopted. The third-quadrant operation of MOSFETs is utilized to reduce the power loss due to the voltage regulation. A switched-capacitor dynamic voltage restorer topology is examined as an example of high-power switched-capacitor converter applications. The switched-capacitor based isolation cell, consisting of two capacitors and four switches, is used to isolate the source from the load. The zero-current-switching for the switches related with the capacitor charging is realized, which helps to reduce the EMI noises and switching loss. Detailed theoretical analysis, simulation and experimental results are included in this dissertation.
Jin Wang (Advisor)
Longya Xu (Committee Member)
Mahesh Illindala (Committee Member)
169 p.
Electrical Engineering

Recommended Citations

Citations

  • Zou, K. (2012). The Topology and Voltage Regulation for High-power Switched-capacitor Converters [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343668215

    APA Style (7th edition)

  • Zou, Ke. The Topology and Voltage Regulation for High-power Switched-capacitor Converters. 2012. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1343668215.

    MLA Style (8th edition)

  • Zou, Ke. "The Topology and Voltage Regulation for High-power Switched-capacitor Converters." Doctoral dissertation, Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343668215

    Chicago Manual of Style (17th edition)

osu1343668215
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© 2012, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.