A Self Synchronized-Switch Rectifier for Piezoelectric-Vibration Energy-Harvesting Systems

In this paper, a high efficiency rectifier using a self-synchronized-switch technique for piezoelectric-energy harvesting system is proposed. By using the multiplexer to control the power transistors, we can not only obtain the same extraction efficiency of synchronized switch rectifier but also eliminates the need for an additional a large switch. As a result, the chip area can be saved. Implemented in 0.35-μm CMOS process, the proposed rectifier can provide the power efficiency of 90%.