A New Topology of DC-DC Converter Based On Piezoelectric Resonator

The emergence of new piezoelectric materials makes it possible to offer high performances in terms of power densities and integration. These new materials can be used in DC-DC power converters as solution to replace the magnetic components and to meet the growth in demand of miniaturization, high power densities and high efficiency applications. This paper deals with a new topology of a DC-DC converter based on piezoelectric resonator. The conversion mechanism, based on energy and charge balance, is explained in details 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 of 100 W. It provides an efficiency higher than 93% for wide operating points in radial mode vibration. As an example, we obtain an efficiency 93.8 % of 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 piezoelectric resonator for high- to-low voltage, high efficiency and low-to-medium power applications.