A Self-powered Multi-input P-SSHI Interface Circuit for Piezoelectric Energy Harvesting with Arbitrary Phase Difference

In this paper, a novel interface circuit based on PSSHI which can be utilized for multi-input piezoelectric energy harvesting is presented. When it comes to the arbitrary phase difference between different piezoelectric transducers (PZT), traditional power conditioning circuit can hardly solve the phase mismatch of multiple sources. However, the proposed circuit can solve this problem with the improved circuit topology of the rectifier. Moreover, self-powered strategy which is designed for the proposed multi-input parallel synchronized switching harvesting on inductor (P-SSHI) circuit is applied as well. When the voltage reaches the peak, the switch is on and the parallel inductor branch access the circuit. Comparing with those based on serial synchronized switching harvesting on inductor (S-SSHI), the energy harvesting efficiency is improved. Moreover, the proposed circuit shows a good compatibility in different cases of the input sources with arbitrary phase difference within (0, 2π).