基于气体激励的压电俘能技术及其在气动系统中的应用与展望

Piezoelectric Energy Harvesting Technology Based on Air Excitation and Its Application and Prospect in Pneumatic System

气动技术正朝着智能化、无线化的方向发展,越来越多的智能传感器引入到气动系统来实现监测与反馈,因此实现传感器长期稳定的供能是当前气动系统亟待解决的关键问题之一。研究表明,利用压电材料可产生毫瓦级的电能输出,能量级数可以满足低功耗传感器的能耗需求,因此该技术有望作为一种新型的供电技术为电池续航,使低功耗传感器长时间稳定地工作。基于此,介绍了压电能量收集技术的起源,气体激励下的压电俘能器结构与研究现状,以及气动系统压力能转化为电能的相关工作。研究结果表明,压电材料可以将气体压力能直接转化为电能,其单片最大输出功率接近10 mW,通过对电能的整理与存储可使气动系统中磁性开关正常工作。该技术可增大电池的使用寿命,甚至将来或可成为气动系统低功耗传感器能量的主要来源。

Pneumatic technology is developing fast and it towards the direction of intelligence and wireless.More and more intelligent sensors are introduced into pneumatic system to realize monitoring and feedback.Therefore,achieving long-term and stable energy supply is one of key problems in pneumatic system.We indicate that piezoelectric material can produce milliwatt-level power,and the energy level can be suitable for low-power sensors.Therefore,this technology is expected to be a new power supply technology for battery life and to make low-power sensors work stably for a long time.We introduce the origin of piezoelectric energy harvesting technology and structure and research status of piezoelectric energy harvester under air excitation,and our work on this technology.The results show that piezoelectric material can directly convert pressure energy into electric energy,and the maximum output power is close to 10 mW with a single patch.A magnetic switch in pneumatic system can be turned by an electric circuit.This technology may extend the battery life,and even become the main energy source for low power sensors in pneumatic systems in the future.