基于Buck变换器控制的压电能量收集电路研究

Research of Piezoelectric Energy Storage Circuit Based on Buck DC-DC Converter Control

传统的压电能量收集电路在外接优化电阻时效率最高,但实际中外接负载具有多样性,很难实现优化电阻.笔者设计了一种基于Buck变换器控制的压电能量收集电路,可在不依赖外部负载的条件下,保证稳定的直流电输出,提高能量收集效率.对电路工作原理进行理论分析,建立了该电路的输出功率数学模型,设计和制作了储能电路模块,并通过实验验证了电路的工作性能.

Traditional piezoelectric energy harvesting circuit achieves maximum efficiency with optimized resistances.However,the external loads are variable and hard to achieve the optimized resistances.A storage circuit with buck DC-DC converter is designed which provides steady DC current whatever the external loads are.The principle of the circuit is analyzed and the numerical modeling of the output power is established.The storage circuit module is fabricated and the performance is verified by experiments.