Study On Power Generation Performance Of Spiral Piezoelectric Power Generation

With the rapid development of wireless technology and microelectronic technology, electronic products such as mobile phone, digital camera and notebook computer greatly enrich and facilitate the people’s life and work. But in the area of energy supply, people still utilize the traditional energy supply, namely, the use of chemical energy batteries as a major energy supply installations. Although the chemical batteries is widely used, but the disadvantage that they need to be replaced frequently, waste material, pollute environment, recycle difficultly, is increasingly conspicuous, so there is urgent demand for energy supply. The vibration energy of piezoelectric power generation device can be converted to electrical energy by piezoelectric effect. The piezoelectric power generation device is a simple structure and convenient processing without poisonous to the environment, and has less constraint. This is a new type of energy conservation and environmental protection structure.The piezoelectric power generation device can be collected to the energy and vibration frequency, amplitude, geometry related. Among them, the vibration frequency is a crucial factor. When external vibration to model the baseband resonance frequency, amplitude, voltage and power can be obtained peak.Therefore, the structural design of the vibration energy harvesting device involved in the application environment is closely related to, the application must be based on the vibration spectrum characteristics. Now the main way to reduce the resonant frequency of the beam is to extend the length of the beam and at the end to add mass, but the extension of MEMS applications is clearly unreasonable, there is not enough space.And add the mass its effect is very small. In this way, the transducer conversion efficiency will be much lower. For this problem, this paper puts forward a new geometric structure of a way to effectively reduce the device resonance frequency and without a significant increase in beam length. And by sliding the mass can easily adjust the natural frequency of the device, which solves the problems of the existing piezoelectric power generation device with high resonant frequency and the external vibration frequency does not match with the natural frequency of the device. This greatly improves the power generation capacity of the piezoelectric power generation device.In this paper, physical device with spiral piezoelectric power generation device is produced and the experimental setup is also put up to test the natural frequency and output voltage, and to analyse the model and dynamic power generation. It can be found that the spiral piezoelectric power generator has low natural frequency, and has a plurality of places to be pasted on the piezoelectric chip, and the power voltage is larger.The finite element model with spiral piezoelectric power generation device is established based on ANSYS 14.5 with static analysis, modal analysis and the piezoelectric coupling analysis. And compare the result of finite element simulation and experimental test, found that the relative error of the natural frequency and the power generation voltage is not more than 10%, which verifies the correctness of the finite element analysis model. After verifying the correctness of the finite element analysis model, the finite element software is used to simulate the spiral piezoelectric generator with different structure parameters. By changing device of mass, length, width, spacing of layers and thickness of the parameters to analyze the influence of the device of natural frequency and power voltage, in order to design the optimal structure model adapt to the environment, so as to obtain the best power generation performance.