A method for extracting equivalent circuit parameters of piezoelectric vibration energy collecting device

Abstract

A method for extracting equivalent circuit parameters of piezoelectric vibration energy collecting device includes such steps as extracting equivalent circuit parameter of piezoelectric vibration energy collect device, extracting equivalent circuit parameters of piezoelectric vibration energy collecting device, extracting equivalent circuit parameters of piezoelectric vibration energy collecting device, one end of the piezoelectric vibration energy collecting device is fixed on the vibration source, the other end is free, the constant sinusoidal vibration acceleration amplitude a is kept, andthe relationship curve between the output voltage and the vibration frequency of the piezoelectric vibration energy collecting device under different load resistances RL is obtained by sweeping frequency; The short-circuit resonant frequency fsc, open-circuit resonant frequency foc, static capacitance Cmc, mechanical quality factor Qoc, mechanical quality factor QML, maximum power value Popt, open-circuit resonant voltage Voc ([omega] oc) are determined. The equivalent inductance Lm, the equivalent capacitance Cm, the equivalent resistance Rm, the equivalent input stress VF, the piezoelectriccoupling coefficient A and the static capacitance Cmc are calculated. Themethod can accurately describe the relationship between the output voltage characteristic of the piezoelectric vibration energycollecting device and the load, the ambient vibration frequency and the acceleration, and the cost of the electric measuring instrument required for measuring is low.

Description

technical field [0001] The invention relates to the field of vibration environment energy collection technology and circuit design, and more specifically relates to a method for extracting equivalent circuit parameters of a piezoelectric vibration energy collection device. Background technique [0002] 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 the different electromechanical conversion principles. The electrostatic type is realized by the capacity change of the variable capacitor due to vibration. The most attractive feature of this method is that it has IC compatibility, and it can be manufactured by silicon micro-processing technology and mass-produced. But in order to realize voltage constraint or charge constraint across the capacitor, independent power supply support...

AI Technical Summary

Problems solved by technology

Some existing circuit parameter extraction methods rely on measuring the vibration state of piezoelectric vibration energy harvesting devices to calculate and determine parameters, and the required measuring instruments such as Doppler laser vibrometers are expensive

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