基于并联电感同步开关控制的振动能量回收方法研究

Vibration energy harvesting based on synchronized switch control of parallel inductor

针对振动能量回收使用的并联电感同步开关(SSHI)控制方法研究中未考虑的控制损耗、储能负载和激励环境等问题,设计了一种基于电流监控、比较器、单片机和双向电子开关的低功耗回收控制电路。单片机通过比较器产生的中断信号控制双向开关适时闭合,成功实现了并联SSHI回收控制电路的功能。以储能装置为负载时,分析了整流电压、振子电容、激励幅值和频率对并联SSHI回收电路控制效果的影响,结果表明该方法在整流电压值较高、振子电容较大、激励频率较高、激励力较小时能够更有效地提高回收效率,为并联SSHI控制方法的应用奠定了一定的理论基础。

In order to improve efficiency of vibration energy harvesting and study effect of ambient exciting force and storage energy load, a low power synchronized switch control circuit of parallel inductor was proposed, it consisted of a current shunt monitor, a comparator, a microcomputer and a bidirectional electronic switch. When the microcomputer turned on or off the switch at the appropriate time according to the interrupt signal generated by the comparator, the control method for parallel synchronized switch harvesting on inductor （SSHI） could be achieved. In the case that the energy storage unit was considered as a load of SSHI, the effects of rectified voltage, piezoelectric oscillator capacitor, the amplitude and frequency of excitation on the efficiency were analyzed. The experimental results showed that the proposed method can improve the vibration harvesting efficiency in case of higher rectified voltage, smaller excitation amplitude, larger capacitor and excitation frequency; meanwhile, the results provide a theoretical basis for the application of SSHI.