压电能量回收系统接口电路研究

发布时间：2018-06-19 09:13

本文选题：能量回收 + 压电片　；参考：《南京航空航天大学》2014年硕士论文

【摘要】：为取代无线系统和便携式电子设备目前采用的锂电池供电方式，能量回收技术得到了迅速发展，其中压电式能量回收系统因其体积小、输出功率大、对电子器件不产生电磁干扰、易于器件的小型化等诸多优点而受到国内外学者的广泛关注和研究。本文对压电式能量回收系统的接口电路展开研究，主要研究内容和取得的成果如下： 1.结合压电材料的第二类压电方程和“弹簧+质量+阻尼块”振动模型建立了能量回收系统的机电耦合模型，从原理上分析了能量回收系统的作用机理，研究了影响回收功率的系统参数。 2.设计了一种新的高效能量回收接口电路并命名为SCEI（Synchronous Charge Extractionand Inversion）接口电路，详细阐明了SCEI接口电路的控制过程，推导了SCEI接口电路在恒定激振位移和恒定激振力情况下的理论回收功率，分析了该回收功率与控制开关导通时间的关系，并在电子仿真软件Multisim中验证了SCEI接口的整个工作过程。 3.推导了Standard、SECE、Parallel-SSHI、Series-SSHI四种经典接口电路在恒定激振位移和恒定激振力情况下的理论回收功率，分析了它们的回收功率与负载、机电耦合系数的关系。在此基础上给出了SCEI接口电路与四种经典接口电路回收功率的比较结果。结果表明：在恒定激振位移情况下并忽略buck-boost转换效率时，SCEI接口电路的回收功率大于四种经典接口电路中具有最大回收功率的Parallel-SSHI电路，，而且SCEI接口电路的回收功率与负载无关；在恒定激振力的情况下，随着系统机电耦合系数的增大，SCEI接口电路的回收功率先增大后减小，表现出与SECE接口相似的性能。 4.根据压电片的性质建立了压电片的电路等效模型，运用此等效模型在Multisim中仿真了Standard、SECE、Parallel-SSHI、Series-SSHI和SCEI接口电路的控制过程和回收功率。 5.搭建能量回收装置实验平台，在相同的激振水平下分别测得了Standard、SECE、Parallel-SSHI、Series-SSHI和SCEI接口电路在恒定激振位移情况下的回收功率与负载的关系，然后比较了这五种电路的实际回收功率大小以及回收功率与负载的关系。实验结果表明：当buck-boost转换器转换效率为0.65时，SCEI接口电路的实际回收功率略小于Parallel-SSHI接口的最大回收功率，并且SCEI接口的回收功率受负载的影响很小。
[Abstract]:In order to replace the current lithium battery power supply mode used in wireless system and portable electronic equipment, the energy recovery technology has been developed rapidly. Among them, piezoelectric energy recovery system has small size and large output power. Many advantages, such as no electromagnetic interference and easy miniaturization of electronic devices, have attracted extensive attention and research from scholars at home and abroad. In this paper, the interface circuit of piezoelectric energy recovery system is studied. The main contents and achievements are as follows: 1. Based on the piezoelectric equation of the second kind of piezoelectric material and the vibration model of "spring mass damping block", the electromechanical coupling model of the energy recovery system is established, and the mechanism of the energy recovery system is analyzed in principle. The system parameters affecting the recovery power are studied. 2. A new high efficiency energy recovery interface circuit named SCEI synchronous charge Extractionand version (SCEI) interface circuit is designed. The control process of sci interface circuit is described in detail. The theoretical recovery power of sci interface circuit under the condition of constant excitation displacement and constant excitation force is derived. The relationship between the recovery power and the switching on time is analyzed. The whole working process of sci interface is verified in the electronic simulation software Multisim. 3. 3. In this paper, the theoretical recovery power of four classical interface circuits of Standard Sec 茅 e Parallel-SSHI Series-SSHI under the condition of constant excitation displacement and constant excitation force is derived, and the relationship between the recovery power and the load and the electromechanical coupling coefficient is analyzed. On this basis, the comparison results between sci interface circuit and four classical interface circuits are given. The results show that the recovery power of sci interface circuit is larger than that of Parallel-SSHI circuit with maximum recovery power in four classical interface circuits, and the recovery power of sci interface circuit is independent of load when the excitation displacement is constant and the efficiency of buck-boost conversion is ignored. In the case of constant exciting force, the recovery power of the sci interface circuit increases first and then decreases with the increase of the electromechanical coupling coefficient of the system, showing a performance similar to that of the SECE interface. 4. According to the properties of piezoelectric chip, the circuit equivalent model of piezoelectric chip is established. The control process and recovery power of the interface circuit of Standard Sessel parallel-SSHISeries-SSHI and sci are simulated in Multisim by using this equivalent model. At the same excitation level, the relationship between the recovery power and the load of the standard SECECE-Parallel-SSHISeries-SSHI and scei interface circuits under the condition of constant excitation displacement is measured by setting up the experimental platform of the energy recovery device. Then the actual recovery power of the five circuits and the relationship between the recovery power and the load are compared. The experimental results show that the actual recovery power of the sci interface circuit is slightly smaller than the maximum recovery power of the Parallel-SSHI interface when the conversion efficiency of the buck-boost converter is 0.65, and the recovery power of the sci interface is little affected by the load.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM619

【参考文献】