Title page for ETD etd-05082002-172013

Type of Document Master's Thesis
Author Baker, Eric Matthew
URN etd-05082002-172013
Title Design of Radial Mode Piezoelectric Transformers for Lamp Ballast Applications
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Chen, Dan Y. Committee Chair
Lee, Fred C. Committee Member
van Wyk, Jacobus Daniel Committee Member
  • lamp ballast
  • piezoelectric transformer
  • radial mode
Date of Defense 2002-05-07
Availability unrestricted
In the past, radial-mode piezoelectric transformer (Transoner) design has been

difficult due to the complex interaction between the physical and electrical circuit

characteristics. Prior to a design procedure, experimental design by Face Electronics, LC

led to a sample that could fit a ballast application enabling zero voltage switching (ZVS)

for the semiconductors without the use of any external inductance.

In the ballast circuit, the piezoelectric transformer is used to replace the

conventional inductor-capacitor resonant tank saving valuable space and expense. With

ballast in mind, a design process has been developed in this thesis to optimize radial

mode transformers to fit specifically tailored applications. The graphical process

described, allows the engineer to design in the capability of zero voltage switching for a

half-bridge drive while simultaneously providing highly efficient performance.

The problem of mounting a piezoelectric transformer to a circuit board has also

been addressed in this thesis. A thermally conductive mounting technique has been

developed which can enhance both the power capability and reliability of circuits

utilizing these devices.

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