一种基于新型欠压闭锁电路的能量收集方法

目前自供电无线压电传感器网络已被广泛应用在智能家居及环境监测等领域。组成网络的每个压电传感器节点需要完成不同功耗的任务,如数据采集、存储等低功耗任务和数据无线传输的高功耗任务。针对低功耗和高功耗任务,该文设计了基于新型欠压闭锁电路的双模组能量收集电路,电路具有蓄能周期短和容量大的特点,可分别用于低功耗任务的低功耗级蓄能模组和高功耗任务的高功耗级蓄能模组,解决了传统单模组能量收集电路因压电传感器节点工作时能量不足或充电过于频繁导致传感器网络无法正常工作的问题。实验结果表明,采用新型欠压闭锁电路的能量收集电路最短蓄能周期仅10 min,能量收集电路最长可驱动压电传感器节点在高功耗模式下工作52 s,是解决自供电无线压电传感器网络能量供给问题的有效办法。

An Energy Harvesting Method Based on a Novel Under voltage Blocking Circuit

The self powered wireless piezoelectric sensor network has been widely used in smart home, environmental monitoring and other fields. Each piezoelectric sensor node in the network needs to complete tasks with different power consumption, such as low power tasks of data acquisition and storage etc., and high power tasks of wireless data transmission etc.. For low power and high power tasks, a dual module energy harvesting circuit based on a new under voltage lockout circuit is designed. The circuit has the characteristics of short energy storage period and large capacity. It can be used for low power level energy storage modules for low power tasks and high power level energy storage modules for high power tasks, which solves the problem that the traditional single module energy harvesting circuit cannot work normally due to insufficient energy or too frequent charging of the piezoelectric sensor node when working. The experimental results show that the shortest energy storage cycle of the energy harvesting circuit using the new under voltage blocking circuit is only 10 min, and the energy harvesting circuit can drive the piezoelectric sensor node to work in high power consumption mode for 52 s, which is an effective way to solve the energy supply problem of self powered wireless piezoelectric sensor network.