Title page for ETD etd-04222003-083524

Type of Document Master's Thesis
Author Huang, Weixing
Author's Email Address wehuang6@vt.edu
URN etd-04222003-083524
Title Design of a Radial Mode Piezoelectric Transformer for a Charge Pump Electronic Ballast with High Power Factor and Zero Voltage Switching
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Chen, Dan Y. Committee Chair
Huang, Alex Q. Committee Member
Lindner, Douglas K. Committee Member
  • PFC
  • Electronic Ballast
  • Piezoelectric Transformer
Date of Defense 2003-04-21
Availability unrestricted
In a conventional electronic ballast for a fluorescent lamp, inductor-capacitor-transformer

tank circuit is used. A Piezoelectric Transformer (PT) can potentially be used

to replace such a tank circuit to save space and cost. In the past, ballast design using a PT

requires selecting a PT from available samples which are normally not matched to

specific application and therefore resulting in poor performance. In this thesis, a design

procedure was proposed for designing a PT tailored for a 120-V 32-W electronic ballast

with high power factor, high efficiency and Zero-Voltage-Switching (ZVS) of the

inverter transistors that drive the lamp. This involves selection of PT materials,

determination of geometries and the number of physical layers of the PT. A radial mode

piezoelectric transformer prototype based on this design process was fabricated by Face

Electronics Inc. and was tested experimentally, the results showed that the ballast using

this custom-made PT achieved high power factor, Zero-Voltage-Switching and a 83%

overall efficiency.

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