A new approach to the wide bandwidth of piezoelectric transducers for vibration energy harvesting

This paper proposes a control system to widen the bandwidth of piezoelectric transducers (PZTs) for vibration energy harvesting while extracting near maximum power. A straightforward complex conjugate match achieves maximum power transfer only at a single frequency while requiring an impractically large inductance. The proposed system intends to address the problem. It incorporates a bi-directional DC/DC converter with feed-forward control for a complex conjugate match over a wide range of frequencies. Analysis of the proposed system and simulation results are presented to verify validity of the proposed method.