Influence of Spurious Modes on the Efficiency of Piezoelectric Transformers: A Sensitivity Analysis

An analysis of the efficiency degradation resulting from spurious modes in piezoelectric transformers (PTs) is presented this article. Circuit performed on PT equivalent circuit models with both a single resonant branch and two branches (spurious mode included), allowing to be analyzed. Multiple sensitivity analyses were then performed, highlighting frequency difference (between modes) characteristic impedance (√L 2 /C ) as critical design parameters for minimizing modes. These are further analyzed determine optimum conditions ensure minimal degradation. Results provide method estimating whether will degrade consequently improving designs.