Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 58, Issue 9, Pages 2597-2606Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2023.3260145
Keywords
Capacitors; Rectifiers; Voltage; Capacitance; Switches; Inductors; Synchronization; Bias-flip rectifier; energy harvesting; Index Terms; inductorless; miniaturization; piezoelectric transducers (PTs); rectifier; synchronized switch harvesting on capacitors (SSHC)
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This article proposes a synchronized switch harvesting on shared capacitors (SSHSC) rectifier for piezoelectric energy harvesting without the need for bulky inductors or dedicated flying capacitors. The SSHSC rectifier utilizes three energy-storage capacitors with a specific capacitance ratio, serving as both storage and flying capacitors. The capacitor-sharing technique enables a smaller volume and fewer I/O pads compared to prior designs.
Synchronized ac-dc rectifiers are widely used for energy rectification in piezoelectric energy harvesting (PEH), which have to employ a bulky inductor or some dedicated flying capacitors for high energy conversion efficiency. This article proposes a synchronized switch harvesting on shared capacitors (SSHSC) rectifier achieving synchronized voltage flipping without inductors or dedicated flying capacitors for PEH. The proposed SSHSC rectifier employs only three energy-storage capacitors with a specific capacitance ratio (3:3:1). These three capacitors mainly serve as storage capacitors; they can also be reused as flying capacitors for bias-flip operations. Thanks to the capacitor-sharing technique, this SSHSC rectifier takes a small volume and fewer I/O pads compared to prior SSHC rectifiers. This design was fabricated in a 180-nm BCD process, and the measured results show 78% voltage flipping efficiency and 7.58 $\times$ power enhancement.
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