A synchronized switch harvesting on capacitor and inductor (SSHCI) circuit for piezoelectric energy harvesting

This paper presents a Synchronized Switch Harvesting on Capacitor and Inductor (SSHCI) circuit designed for piezoelectric energy harvesting, which combines the SSHI method with the SSHC operation. Initially, the proposed SSHCI circuit employs synchronized switches to perform the SSHC operation, allowing for energy harvesting from the Piezoelectric Transducer (PZT). Following this, it transitions into the SSHI operation to invert the charges on the PZT, thereby enhancing the working voltage. Additionally, the traditional diode rectifier bridge found in conventional circuits is removed by the voltage doubling rectifier circuit to decrease the power loss. An experimental platform has been developed to evaluate the power generation performance of the proposed circuit. The results indicate that the SSHCI circuit achieves a peak power output that is 9.8% greater than that of the existing parallel SSHI circuit and 13.2% greater than that of the serial SSHI circuit, respectively.