SSHC with One Capacitor for Piezoelectric Energy Harvesting

Piezoelectric vibration energy harvesters have attracted a lot of attention as a way to power self-sustaining electronic systems. Furthermore, as part of the growing Internet of Things (loT) paradigm, the ongoing push for downsizing and higher degrees of integration continues to constitute major drivers for autonomous sensor systems. Two of the most effective interface circuits for piezoelectric energy harvesters are synchronised switch harvesting (SSH) on inductor and synchronous electrical charge extraction; nevertheless, inductors are essential components in both interfaces. This study proposes an inductor-less bias-flip rectifier that uses capacitors instead of inductors to conduct residual charge inversion. A 130-nm CMOS process is used to design the proposed SSH on capacitors circuit. This innovation outperforms most documented state-of-the-art inductor-based interface circuits, and the suggested circuit has a much reduced overall volume, allowing for system downsizing. © 2022 IEEE.