基于反激变压器的压电振动能量双向操控技术

压电材料因其具有良好的机电耦合特性, 在振动能量俘获和结构振动控制领域有着良好的应用前景. 基于同步开关和电感的压电元件接口控制电路, 可以通过振荡电路工作原理调节压电元件的电压幅值和相位, 优化压电振动系统的机电能量转化. 优化型同步电荷提取技术即基于上述接口控制电路实现了压电振动能到电能的高效转换. 本文提出了一种衍生于优化型同步电荷提取电路的压电阻尼半主动控制电路, 借鉴反激变压器的原、副边能量转换特性, 实现了压电振动控制系统从电能到机械能的能量操控, 进而达到结构振动抑制的效果. 至此, 结合了压电电荷能提取与压电阻尼半主动控制技术的新电路, 以反激变压器为核心实现了压电振动能量的双向操纵. 论文首先介绍了相应的控制电路及工作原理, 推导了新型同步开关阻尼技术下的结构的振动阻尼比模型, 搭建了压电悬臂梁振动控制实验平台, 最终通过实验验证了理论模型, 并使用更简单的控制方法解决了振动控制系统的稳定性问题. 

BIDIRECTIONAL PIEZOELECTRIC VIBRATION ENERGY CONTROL TECHNOLOGY BASED ON FLYBACK TRANSFORMER

Piezoelectric materials have good application prospects in the fields of vibration energy harvesting and structural vibration control due to their good electromechanical coupling characteristics. The piezoelectric interface control circuits based on synchronous switch and inductance can adjust the piezoelectric voltage amplitude and phase according to the working principle of oscillation circuit, optimizing the electromechanical energy conversion in piezoelectric vibration systems. The optimized synchronous electric charge extraction technique based on the interface control circuit mentioned above has realized the efficient piezoelectric energy conversion from vibration to electrical energy. This paper proposed a semi-active piezoelectric damping control circuit derived from the optimized synchronous electric charge extraction circuit. The energy conversion phenomenon between the primary and secondary sides of flyback transformer was unitized, the structure vibration suppression was then realized by transferring the electrical energy into the mechanical energy in piezoelectric vibration control systems. The new circuit which combines the piezoelectric electric charge energy extraction and the semi-active damping control approach realized the bidirectional control of piezoelectric vibration system, with a core of flyback transformer. The corresponding control circuit and its working principle were introduced, the piezoelectric vibration damping model under the new synchronized switch damping technology was also established. An experimental platform for the vibration control of a piezoelectric cantilever beam was built and the theoretical model is verified through experiments, the stability problem of the vibration control system was also solved through a simpler control approach.