Wen Zhongquan

Vibration-based Piezoelectric Generator and Its Application in the Wireless Sensor Node

The mathematical model of the vibration-based piezoelectric generator with the proof mass supported by a cantilever is established.The formulas of the frequency,the output voltage and the output power are derived.Testing results show that this model is more accurate than Roundys model.According to such characters as large transient power and small average power of the typical wireless sensor node,the power self-regulation circuit of the piezoelectric multi-shaker micro-generator is proposed.When the electricity in the super capacitor of the main circuit is enough to power the wireless sensor node,the main circuit is opened by the ancillary return circuit and the node starts to measure and transfer the results to the monitoring center.The field test on an engine of a ship shows that the vibration-based piezoelectric generator can be used to power a wireless sensor node.

Power Self-Regulation Circuit of Piezoelectric Multi-Shaker Micro-Generator

Based on requirement for power supply of wireless emitting module of machine malfunction vibration monitoring system and characteristic of low power output of micro-generator, a novel power supply manage and control module which controls output power of micro-generator is advanced, and low power consumption self-regulation circuit is designed. Its feasibility has been proved by experiments. Under the condition of resonance frequency 50 Hz and acceleration 0. 15 g ~ 0. 2 g, piezoelectric multi-shaker micro-generator managed by power self-regulation circuit could maintain wireless emitting module of machine malfunction monitoring system to stably work for long time at 3.28 V.