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The trends in power DC/DC conversion are not only size and weight reduction together with a good efficiency; EMI and mass production are a must as well. In this context, piezoelectric transformers seem to be the ideal solution, since they allow higher switching frequencies (size and weight reduction) while also providing high efficiencies. Additionally, they are not magnetic devices, which facilitates...
A current trend in power electronics is the integration of power supplies. In this field, electromagnetic transformers may be replaced by piezoelectric transformers (PT). In a PT, the input electrical energy is transferred to the output through a mechanical wave using the direct and converse effects of piezoelectric materials. It has been proved that PT exhibit suitable characteristic, good integration...
An adaptive frequency control method for AC/DC adapters using a piezoelectric transformer (PT) is proposed. It combined the conventional frequency method and frequency tracking for the PT such that the main frequency control loop to regulate the output voltage is compensated by the phase loop in order to adaptively change the operating frequency range. This method provides PT gain peak tracking to...
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...
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