基于压电的传感器自供电系统设计方法

针对规模化养殖场通风状态监测的需求，设计风致振动压电俘能系统解决监测传感器自供电问题.自供电系统由压电俘能结构和能量管理电路组成，可将风能转换为电能.分析和测试结果表明压电式俘能结构可输出电压10.88 V，功率6.975 mW；LTspice软件仿真结果表明能量管理电路可实现电压转换，并稳定输出电压3.3 V.根据机械系统与电路系统的相似关系，对自供电系统整体建模，Matlab/Simulink软件仿真结果显示:压电俘能结构输出电压10.87 V、功率6.989 mW，自供电系统终端可输出3.3 V电压，结果与俘能结构和能量管理电路仿真、测试结果基本一致，说明系统整体建模正确，方案合理.通过现场测试，通风口处风速为2.6 m/s时，自供电系统能够输出电压3.3 V，为监测传感器稳定供电，该研究可在通风监测传感器自供电系统中广泛应用. 

Design Method of Sensor Self-Powered System Based on Piezoelectricity

According to the requirements of ventilation condition monitoring for large-scale farms, a system of wind-induced vibration piezoelectric harvesting energy was designed to solve the self-powered problem of monitoring sensors. The self-powered system consists of piezoelectric energy harvesting structure and energy management circuit, and that can convert wind energy into electricity. The results of the analysis and testing indicate that the piezoelectric energy harvesting structure could output 10.88 V voltage and 6.975 mW power. The results of LTspice simulation show that the energy management circuit based on LTC3588-1 could realize the function of voltage conversion and output 3.3 V voltage stably. According to the similarity between mechanical system and electrical system, the overall model of the self-powered system was built, the simulation results of Matlab/Simulink show that the piezoelectric energy harvesting structure could output 10.87 V voltage and 6.989 mW power, and the end self-powered system could output 3.3 V voltage. All the above results are basically consistent with the simulation and test results of energy harvesting structure and energy management circuit, indicating that the overall modeling of the system is correct and the scheme is reasonable. Through the field test, when the wind speed was 2.6 m/s at the vent, the self-powered system could output 3.3 V voltage, and supply power to the sensor monitoring system stably. This study can be used in the ventilation monitoring sensor self-powered system widely.