title: Power density of piezoelectric transformers improved using a contact heat transfer structure.
abstract: Based on contact heat transfer, a novel method to increase power density of piezoelectric transformers is proposed. A heat transfer structure is realized by directly attaching a dissipater to the piezoelectric transformer plate. By maintaining the vibration mode of the transformer and limiting additional energy losses from the contact interface, an appropriate design can improve power density of the transformer on a large scale, resulting from effective suppression of its working temperature rise. A prototype device was fabricated from a rectangular piezoelectric transformer, a copper heat transfer sheet, a thermal grease insulation pad, and an aluminum heat radiator. The experimental results show the transformer maintains a maximum power density of 135 W/cm(3) and an efficiency of 90.8% with a temperature rise of less than 10 °C after more than 36 h, without notable changes in performance.
authors.affiliation: Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, People’s Republic of China. fff@ustc.edu.cn
authors.forename: Wei Wei
authors.initials: WW
authors.lastname: Shao
authors.forename: Li Juan
authors.initials: LJ
authors.lastname: Chen
authors.forename: Cheng Liang
authors.initials: CL
authors.lastname: Pan
authors.forename: Yong Bin
authors.initials: YB
authors.lastname: Liu
authors.forename: Zhi Hua
authors.initials: ZH
authors.lastname: Feng