Equivalent circuit model for cantilever beam type electric vibration energy collection device
An equivalent circuit model, cantilever beam technology, applied in electrical components, generators/motors, piezoelectric effect/electrostrictive or magnetostrictive motors, etc., can solve the problem that the model parameter determination method is no longer applicable
Inactive Publication Date: 2018-11-23
天津大学(青岛)海洋工程研究院有限公司
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However, this model can only be used to simulate the electromechanical coupling relationship of single and bimorph cantilever piezoelectric vibration energy harvesting devices. For piezoelectric vibration energy harvesting devices with multiple non-piezoelectric layers, the method for determining the parameters of this model is not suitable. then apply
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[0038] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following will give a specific description of the implementation of the present invention in conjunction with examples. For a given Mide V25W model cantilever piezoelectric vibration energy harvesting device, the experimental determination method of five independent parameters is as follows: one end of the cantilever piezoelectric vibration energy harvesting device is fixed on the vibration source, and the other end is free and kept constant Sinusoidal acceleration, different load resistance R obtained by frequency sweep L The relationship between the output voltage and frequency of the lower cantilever beam piezoelectric vibration energy harvesting device. Such as Figure 5 It is shown that under the sinusoidal acceleration of 0.2g amplitude, the loads are open circuit, resistance R L =720Ω (approximate short circuit), resistance R L =7200Ω, the model is the rel...
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The invention discloses an equivalent circuit model for a cantilever beam type electric vibration energy collection device. According to the model, a relationship between an output voltage of the cantilever beam type electric vibration energy collection device and an ambient vibration frequency and acceleration is accurately described, the model can be used for not only simulating an electromechanical coupling relationship of a single / double-piezoelectric-wafer cantilever beam type electric vibration energy collection device but also simulating a piezoelectric vibration energy collection device with a plurality of non-piezoelectric layers, and on the basis of the equivalent circuit model, a researcher can simulate the electrical properties of the cantilever beam type electric vibration energy collection device relatively accurately under an experimental condition in circuit simulation software.
Description
technical field [0001] The invention relates to the field of vibration environment energy collection technology and circuit design, in particular to a modeling and parameter determination method for improving the accuracy of an equivalent circuit model of a cantilever beam piezoelectric vibration energy collection device. Background technique [0002] Since the 1980s, some foreign scientific research institutions have begun to study energy collection systems based on mechanical energy. The research results show that it is feasible to obtain energy from mechanical vibrations, although only small-scale electricity can be generated, generally in the range of microwatts to milliwatts. between watts, but enough for micropower systems. Vibration energy harvesting devices can convert the vibration energy widely present in the environment into electrical energy. The energy conversion methods are divided into three types: electrostatic, electromagnetic and piezoelectric according to ...
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Inventor 马建国赵升傅海鹏
Owner 天津大学(青岛)海洋工程研究院有限公司