A microprocessor controlled piezoelectric power converter

Piezoelectric transformer (PT) for power conversion is receiving more and more attention because of its small thickness and high energy density. A major challenge of PT converter is the resonant characteristic of the PT that affects the performance of the whole converter. This paper presents a microprocessor controlled piezoelectric power converter system for cold cathode fluorescent lamp (CCFL) that can provide stable output around the resonant point of the PT. A microcontroller based control algorithm is introduced to provide frequency tracking. Experimental results are presented and illustrate that this system is suitable for such application.