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
Dan Y. Chen	Committee Chair
Alex Q. Huang	Committee Member
Douglas K. Lindner	Committee Member

Keywords

PFC
Electronic Ballast
Piezoelectric Transformer

Date of Defense

2003-04-21

Availability

unrestricted

Abstract

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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