自供电压电电磁混合能量俘获电路

Self-Powered Hybrid Harvesting Circuit for Piezoelectric Energy and Electromagnetic Energy

在能量俘获电路设计中,采用混合能量俘获可提高电路输出功率和可靠性,但存在需要外加电源、控制电路复杂等问题。针对压电和电磁能俘获,在基于同步翻转电荷提取的结构基础上,提出了自供电压电电磁混合能量俘获电路(Dual Source-Synchronous Inversion and Charge Extraction,DS-SICE)。电路工作原理如下:在振动的正半周期,压电电压达到峰值时,利用电磁能作为辅助对压电片上的电压进行翻转;在振动的负半周期,采用同步电荷提取结构(Synchronous Electric Charge Extraction,SECE),提取压电片和电磁发电机的能量。所提出的DS-SICE电路在增加输出功率的同时,减少了负载依赖性,实现了两种能量源的协同作用。仿真和实验测试结果表明,所提出的电路可以实现压电振动能和电磁能的同步采集。较之于标准能量俘获电路最大输出功率,电路的效率提高2.7倍,并且降低了对负载的依赖性。

For the design of energy harvesting circuit,the use of hybrid energy harvesting can improve the circuit output power and reliability.However,there are problems such as the need for an external power supply and the complexity of the control circuit.For the harvesting of piezoelectric and electromagnetic energy,a self-powered hybrid energy harvesting circuit is proposed based on the structure of synchronous inversion and charge extraction(Dual Source-Synchronous Inversion and Charge Extraction,DS-SICE).The working principle of the circuit is as follows:in the positive half cycle of vibration,when the piezoelectric voltage reaches the peak value,the electromagnetic energy is used as an auxiliary to flip the voltage on the piezoelectric element;in the negative cycle,the synchronous electric charge extraction(SECE)structure is used to simultaneously extract the piezoelectric and electromagnetic charge to the load,realizing the synergistic effect of the two energy sources.The proposed DS-SICE circuit reduces load dependence while the output power is increased.Simulation and experimental test results show that the proposed circuit can realize the synchronous harvesting of piezoelectric vibration energy and electromagnetic energy.Compared with the maximum output power of the standard energy harvest circuit,the efficiency of this scheme is improved up to 2.7 times and the dependence on the load is reduced.