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Design of a Radial Mode Piezoelectric Transformer for a Charge Pump Electronic Ballast with High Power Factor and Zero Voltage Switching
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%