A Self-powered Piezoelectric Energy Harvesting Circuit with Frequency Conversion for Wireless Sensor Network
نویسندگان
چکیده
This paper presents a self-powered piezoelectric energy harvesting circuit using frequency conversion. A vibration energy harvesting principle is introduced. Due to a capacitive characteristic of the piezoelectric vibration transducer, an energy harvesting circuit is proposed for matching the capacitive impedance. The energy harvesting circuit consists of a matching circuit with up-conversion, an ac-dc rectifier, a storage supercapacitor, a control unit and a dc-dc converter. The electric energy derived from the piezoelectric element charges the supercapacitor Cst by using the matching circuit and the ac-dc rectifier. The small-size matching circuit can be obtained by using an up-conversion switch circuit. The step-up dc-dc converter can be switched on by the control unit when the voltage of the supercapacitor reaches a threshold voltage. A stronger power can be obtained by the supercapacitor discharge and the wireless sensor node can be drived.
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