Yanjie Pan
ABSTRACT
With the rise of the Internet of Things (IoT), ambient vibration energy harvesting technology using piezoelectric transducers has drawn much research interest in realizing the power supply for wireless sensor networks (WSNs). To improve the efficiency of energy harvesting, an interface circuit is required to operate energy management action. The synchronized switch harvesting on inductor (SSHI) method is the most efficient method of extracting energy from the piezoelectric transducer. This paper presents a self-powered piezoelectric energy harvesting (PEH) interface circuit, which integrates a SSHI rectifier with self-adaptive switch control. The proposed circuit includes an active diode in each LC resonant tank to reduce the reverse current of the inductor. The SSHI rectifier, therefore, has high adaptability to external inductors and piezoelectric transducers. The switch control circuit of this paper is directly powered by the rectified voltage to avoid an external power supply for higher integration. Compared with the conventional SSHI rectifier, the proposed implementation achieves high voltage flipping efficiency with a small flipping inductor. The proposed circuit is designed in 180nm CMOS process, and the chip area is 0.163mm2. The simulation result shows that the proposed circuit achieves cold start-up operation without any external power supply and can work with high efficiency when the external inductor is varying from 1 to 1000μH. The simulated maximum output power of the proposed design is 2.5× higher than that of the ideal full-bridge rectifier.
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Index Terms
- An Efficient SSHI Interface circuit with Self-adaptive Switch Control for Piezoelectric Energy Harvesting
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