双压电片换能器力电等效模型的建模与仿真

摘要

双压电片换能器是一种新型的供电装置,可广泛应用于对无线传感器网络节点进行供电.首先采用Pspice内置受控源建立常微分方程宏模型的方法,建立行为级与电路级混合的压电能量收集装置力电等效模型来解决力学模型与电路模型混合仿真的数据迭代问题,最后结合电能存储技术方法,利用Pspice仿真分析能量收集装置接纯容性负载的输出特性.仿真结果有效验证了压电能量收集装置力电等效模型的正确性和供电的可行性.%Bimorph energy conversion device provides a new method for power supply,which can be widely used in wireless sensor network nodes. Using the built-in controlled sources with Pspice to build the marco-models of ordinary differential equation, the electro-mechanical model of power harvesting device is established both at behavior-level and circuit-level to solve the data iteration problem of hybrid simulation both at mechanical model and circuit model. Combining piezoelectric power harvesting device and electrical energy storage technology, the output characteristics of power harvesting device connected with pure capacitive load are simulated and analyzed with Pspice Simulation to verify the correctness of electro-mechanical model and the feasibility of power supply.