Piezoelectric energy harvester interface with real-time MPPT

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

物理学;能源学

Elliott, A.D.T.^1 ; Mitcheson, P.D.^1

Department of Electrical and Electronic Engineering, Imperial College London, South Kensington, London

SW6 2BT, United Kingdom^1

关键词: Biasing voltages;    Conduction angle;    Diode bridge rectifiers;    Mechanical excitations;    Mechanical force;    Piezoelectric energy harvesters;    Piezoelectric harvester;    Real-time adaptation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/557/1/012125/pdf
DOI  :  10.1088/1742-6596/557/1/012125

来源: IOP

【 摘 要 】

Power of resonant piezoelectric harvesters can be severely limited if the damping force cannot be dynamically altered as the mechanical excitation level changes. The singlesupply pre-biasing (SSPB) technique enables the Coulomb damping force to be set by a single voltage and so by varying that voltage, real-time adaptation to variations in the mechanical force can be implemented. Similarly the conduction angle of a diode bridge rectifier circuit can be altered by changing the biasing voltage applied. This paper presents a method of achieving this by altering the amount of energy transferred from the pre-biasing capacitor used in SSPB and the diode bridge rectifier to a storage battery via a buck converter. The control system was implemented on a FPGA and consumed 50 μW.