An SSHC Circuit Integrated with an Active Rectifier for Piezoelectric Energy Harvesting

Liao Wu, Chenrui Guo, Zhongsheng Chen, Dong Sam Ha

Abstract: This paper presents a piezoelectric energy harvesting circuit, which integrates a Synchronized Switch Harvesting on Capacitors (SSHC) and an active rectifier. An SSHC circuit does not require an inductor for voltage flipping, and hence is suitable for an on-chip implementation of the circuit. Existing SSHC circuits require dedicated switch drivers, which increases the circuit complexity to result in high power dissipation. The proposed circuit addresses this problem through integration of SSHC and a rectifier. The proposed circuit is designed in 0.35 μm CMOS technology. The simulation results indicate conversion efficiency of 92%, which is far higher than state-of-art SSHC circuits.