Abstract
The emergence of new piezoelectric materials makes it possible to offer high performances in terms of power density and integration. These new materials can be used in dc–dc power converters as a solution to replace the magnetic components and to meet the growing demand for miniaturization, high power density, and high-efficiency applications. This article deals with a new topology of a dc–dc converter based on a piezoelectric resonator. The conversion mechanism based on energy and charge balance is explained in detail through an analytical model and validated by experimental results. A prototype has been designed for an input–output voltage up to 250–125 V and a power range up to 175 W. It provides an efficiency higher than 93% for wide operating points in radial mode vibration. As an example, we have obtained an efficiency of 93.8% for 250–117 V input–output voltage at 50 W output power. In addition, the thickness mode operation is experimentally validated at 1 MHz and exhibited a peak output power of 175 W with an efficiency of 80% for 200–60 V input–output voltage. The experimental results show the promising performances of the proposed dc–dc power converter based on a piezoelectric resonator for high-to-low voltage, high efficiency, and low-to-medium power applications.
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