Research on interfacing circuits based on bistable piezoelectric energy harvester

In order to promote the use of wireless sensor networks, an electrical interfacing circuit selection scheme for non-linear bistable energy harvester is investigated. This paper presents standard rectifier circuit, series and parallel synchronized switch harvesting on inductor (SSHI) circuits for theoretical analysis and experimental verification. Combining with practical applications, the DC voltage obtained by the system is taken as the system performance indicator, and the relationship between the load resistance and the performance of the three interfacing circuits is obtained: the performance of the series-SSHI circuit is better than other interfacing circuits in low terminal load situation. With the load resistance increases, the performance of the parallel-SSHI circuit gradually increases and exceeds the series-SSHI circuit. The influence of the load resistance increase on the motion of the bistable oscillator is verified, and the results shows that the motion of the bistable oscillator connected by the standard interfacing circuit is the least affected by the load, and the circuit's performance is relatively stable.