Adaptive piezoelectric energy harvesting circuit for wireless remote power supply
Tóm tắt
This paper describes an approach to harvesting electrical energy from a mechanically excited piezoelectric element. A vibrating piezoelectric device differs from a typical electrical power source in that it has a capacitive rather than inductive source impedance, and may be driven by mechanical vibrations of varying amplitude. An analytical expression for the optimal power flow from a rectified piezoelectric device is derived, and an "energy harvesting" circuit is proposed which can achieve this optimal power flow. The harvesting circuit consists of an AC-DC rectifier with an output capacitor, an electrochemical battery, and a switch-mode DC-DC converter that controls the energy flow into the battery. An adaptive control technique for the DC-DC converter is used to continuously implement the optimal power transfer theory and maximize the power stored by the battery. Experimental results reveal that use of the adaptive DC-DC converter increases power transfer by over 400% as compared to when the DC-DC converter is not used.
Từ khóa
#Power supplies #DC-DC power converters #Batteries #Piezoelectric devices #Load flow #Impedance #Vibrations #Rectifiers #Switched capacitor circuits #Switching circuitsTài liệu tham khảo
10.1109/2.869369
10.1109/40.928763
10.1049/ip-smt:20010323
10.1109/63.903988
smalser, 1997, Power Transfer of Piezoelectric Generated Energy
mohan, 1995, POWER ELECTRONICS Converters Applications and Design
10.1109/PESC.1993.471984
kokotovic, 1987, Singular Perturbation Methods in Control Analysis and Design
10.1109/IECON.1992.254498
10.1109/ISWC.1998.729539
10.1109/PESC.1998.701883
10.1006/jsvi.1999.2755