Improved Interface Circuit for Enhancing the Power Output of a Vibration-Threshold-Triggered Piezoelectric Energy Harvester
Abstract
:1. Introduction
2. Vibration-Threshold-Triggered Piezoelectric Energy Harvester
2.1. Structure and Operating Principles of the Vibration-Threshold-Triggered Energy Harvester
2.2. Modeling of the Vibration-Threshold-Triggered Energy Harvester
2.2.1. Vibration Model
2.2.2. Equivalent Circuit Model
2.3. Parameter Calculation of Vibration Model
2.4. Impedance Characteristics of the Vibration-Threshold-Triggered Energy Harvester
3. Interface Circuit of the Vibration-Threshold-Triggered Energy Harvester
3.1. Standard Energy-Harvesting Interface Circuit
3.2. Improved Energy-Harvesting Interface Circuit
4. Experimental Results
5. Discussion and Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Parameter | Symbol | Value |
---|---|---|
Thickness of sensing stage | hs | 100 µm |
Length of sensing stage | Ls | 13.0 mm |
Mass of sensing stage | m | 0.93 g |
Width of sensing stage | bs | 8.0 mm |
Thickness of generating stage | hg | 60 µm |
Length of generating stage | Lg | 11.0 mm |
Width of generating stage | bg | 4.0 mm |
Length of PZT | Lp | 5.5 mm |
Thickness of PZT | hp | 60 µm |
Young’s modulus of substrate | Ys | 110 Gp |
Young’s modulus of PZT | Yp | 60 Gp |
Density of substrate | ρs | 8800 kg/m3 |
Density of PZT | ρp | 7500 kg/m3 |
Damping constants | α0 | 4.894 |
α1 | 1.235 × 10−5 | |
Piezoelectric coupling | d31 | 280 × 10−12 m/V |
Relative electrical permittivity | ε | 4600 |
Gap distance | G | 750 µm |
Residual magnetism | Br | 1.0 T |
298.962 | 5.359 × 10−5 | 0.003 | 7.030 × 10−4 | 1.679 × 10−8 |
Components | Part Number | Notes |
---|---|---|
Rectifier bridge | MB6S | VFmax = 1.0 V |
MOSFET | SI2302 | VGS(th) = 1.2 V; RDS(on) = 55 mΩ |
Inductor L | - | 47 mH |
Diode D | BAT54L | VF = 0.4 V at 10 mA |
Capacitor C1,C2 | AVX Tantalum capacitor | 100 μF |
Oscillator | Generated by the signal generator | VM = 3 V; f = 15 kHz; d = 22% |
Frequency | Average Energy-Harvesting Power (μW) | Percentage Energy Increase (%) | |
---|---|---|---|
Standard Interface Circuit | Improved Interface Circuit | ||
20 Hz | 7.1 | 10.8 | 52.1 |
30 Hz | 15.6 | 23.1 | 48.1 |
40 Hz | 62.5 | 102.0 | 55.7 |
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Liu, J.; Yang, J.; Han, R.; He, Q.; Xu, D.; Li, X. Improved Interface Circuit for Enhancing the Power Output of a Vibration-Threshold-Triggered Piezoelectric Energy Harvester. Energies 2020, 13, 3830. https://doi.org/10.3390/en13153830
Liu J, Yang J, Han R, He Q, Xu D, Li X. Improved Interface Circuit for Enhancing the Power Output of a Vibration-Threshold-Triggered Piezoelectric Energy Harvester. Energies. 2020; 13(15):3830. https://doi.org/10.3390/en13153830
Chicago/Turabian StyleLiu, Jiqiang, Junjie Yang, Ruofeng Han, Qisheng He, Dacheng Xu, and Xinxin Li. 2020. "Improved Interface Circuit for Enhancing the Power Output of a Vibration-Threshold-Triggered Piezoelectric Energy Harvester" Energies 13, no. 15: 3830. https://doi.org/10.3390/en13153830