Low-power Methods of Power Sensing and Frequency Detection for Wideband Vibration Energy Harvesting

14th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Proynov, P.^1 ; Stark, B.H.^1 ; McNeill, N.^1

Department of Electrical and Electronic Engineering, University of Bristol, United Kingdom^1

关键词: Available power;    Excitation frequency;    Frequency detection;    Frequency measurements;    Low-power circuit;    Measurement range;    Power sensing;    Vibration energy harvesting;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/557/1/012127/pdf
DOI  :  10.1088/1742-6596/557/1/012127

来源: IOP

【 摘 要 】

Power maximisation techniques in wideband vibration energy harvesting typically require the periodic sensing of input power or excitation frequency. This paper presents low- power circuits and sensing methods to obtain this information. First, an excitation frequency measurement circuit is presented that permits a reduced timer run-time compared to reported methods. Second, a power sensing method is presented, which extends the measurement range of reported techniques by adapting to the levels of the available power. Experimental results for the frequency measurement circuit tested in the range 35-51 Hz show a power consumption of 3.7 μW. The power-sensing technique is experimentally validated over a power range of 370690 μW, and its power consumption is 7.5 μW.