2026-09-19T21:53:23Zhttps://dspace.mit.edu/server/oai/request

oai:dspace.mit.edu:1721.1/1561522024-08-15T03:33:29Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023

Perreault, David J. Jackson, Amanda Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science 2024-08-14T20:11:23Z 2024-08-14T20:11:23Z 2024-05 2024-07-10T12:59:40.858Z https://hdl.handle.net/1721.1/156152 https://orcid.org/0000-0001-5403-8205 Magnetics are key components of conventional power converters, but they are often the bottleneck to achieving high power density due to their size, weight, and poor performance at small sizes. Piezoelectric devices, when operated in their inductive regime, can serve a purpose similar to that of magnetic components and offer favorable scaling properties as components are miniaturized. Several sources have demonstrated the viability of piezoelectric-based power converters, but selection of the optimal material and component size is limited by a lack of data on the performance of these materials at high drive levels. This work aims to fill that gap by collecting data to more completely characterize the losses in piezoelectric resonators owing to both mechanical and dielectric effects. To account for mechanical losses, the variation in resonator quality factor is examined across a range of drive levels for multiple resonator sizes, frequencies, and materials. By normalizing the collected data, material trends are derived that can predict mechanical losses under high drive levels, offering more insight into realistic converter operation than the currently available small-signal data sheet values. Additionally, a method for measuring high-power dielectric loss is presented, with results showing that the small-signal loss tangent provides a good approximation of losses even at higher drive levels. Based on these trends, implications for converter efficiency and selection of material and dimensions are discussed. S.M. Massachusetts Institute of Technology In Copyright - Educational Use Permitted Copyright retained by author(s) https://rightsstatements.org/page/InC-EDU/1.0/ Large-Signal Characterization of Piezoelectric Resonators for Power Conversion Thesis application/pdf Master Master of Science in Electrical Engineering and Computer Science Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="73fc2eb5-3086-430d-a8c4-b2d25e079dd6"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Title>Large-Signal Characterization of Piezoelectric Resonators for Power Conversion</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2024-05</PublicationDate> <Authors> <Author> <DisplayName>Jackson, Amanda</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>https://rightsstatements.org/page/InC-EDU/1.0/</License> <Abstract>Magnetics are key components of conventional power converters, but they are often the bottleneck to achieving high power density due to their size, weight, and poor performance at small sizes. Piezoelectric devices, when operated in their inductive regime, can serve a purpose similar to that of magnetic components and offer favorable scaling properties as components are miniaturized. Several sources have demonstrated the viability of piezoelectric-based power converters, but selection of the optimal material and component size is limited by a lack of data on the performance of these materials at high drive levels. This work aims to fill that gap by collecting data to more completely characterize the losses in piezoelectric resonators owing to both mechanical and dielectric effects. To account for mechanical losses, the variation in resonator quality factor is examined across a range of drive levels for multiple resonator sizes, frequencies, and materials. By normalizing the collected data, material trends are derived that can predict mechanical losses under high drive levels, offering more insight into realistic converter operation than the currently available small-signal data sheet values. Additionally, a method for measuring high-power dielectric loss is presented, with results showing that the small-signal loss tangent provides a good approximation of losses even at higher drive levels. Based on these trends, implications for converter efficiency and selection of material and dimensions are discussed.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>