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Flying Capacitor Multilevel Flyback Converter

Graziani, Santino (2022) Flying Capacitor Multilevel Flyback Converter. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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This analyzes and justifies the capabilities of the flying capacitor multilevel flyback converter (FCMFC) structure for DC-DC power conversion. The proposed converter has been analyzed mathematically for theory of operation and simulated extensively in the process. Furthermore, the theoretical and simulation backed efforts have been proven using a series of hardware prototypes to ensure the analysis. This new converter utilizes the very commonly used flyback converter as its core structure. The secondary side filter has been replaced with a series of switch-diode-capacitor (SDC) cells that cycle the flying capacitors for improved overall converter performance. Major improvements are seen for converter efficiency and voltage gain capability, making the FCMFC a promising candidate as a DC converter, that expands the capabilities and thus applicability of the flyback converter. Use of the FCMFC structure gives a designer more variability in the design and expands the range of use for commercial off-the-shelf (COTS) flyback transformers. This can be very useful for a designer by eliminating the need to venture into the magnetic design of a new transformer, which can be very time consuming and complicated. Magnetic component companies also have limited selection range for magnetic components, especially for transformers because of the expense involved to design and test. FCMFC balances energy between the core transformer and flying capacitors, allowing it to handle more power with a lower input ripple current. The input MOSFET switch, that is core to the flyback converter and FCMFC, experiences a reduced stress of operation because of the proposed structure. The secondary side SDC components distribute voltage gain which lowers their voltage stress. Many other multilevel structures have been designed with great success for this reason, however, none of those structures see the same voltage gain benefit that FCMFC has, making it particularly unique. For this reason, the FCMFC has been the research focus and is the proposed topology. This work will analyze and exemplify the validity of FCMFC to justify the contribution to the field of power electronics.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Graziani, Santinosfg10@pitt.edusfg10
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairGrainger, Brandonbmg10@pitt.edubmg10
Committee MemberOhodnicki, Paulpro8@pitt.edupro8
Committee MemberMao, Zhi-Hongzhm4@pitt.eduzhm4
Committee MemberKwasinski, Alexisakwasins@pitt.eduakwasins
Committee MemberBarth,
Date: 6 September 2022
Date Type: Publication
Defense Date: 6 July 2022
Approval Date: 6 September 2022
Submission Date: 20 June 2022
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 189
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Electrical Engineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: power electronics, flyback converter, flying capacitors, multilevel
Date Deposited: 06 Sep 2022 16:24
Last Modified: 06 Sep 2022 16:24


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