Review of Power Conditioning for Kinetic Energy Harvesting Systems

Abstract

In this paper, a summary of published techniques for power conditioning within energy harvesting systems is presented. The focus is on low-power systems, e.g, <10 mW, for kinetic energy harvesting. Published concepts are grouped according to functionality and results contrasted. The various techniques described are considered in terms of complexity, efficiency, quiescent power consumption, startup behavior, and utilization of the harvester compared to an optimum load. This paper concludes with an overview of power management techniques that aim to maximize the extracted power and the utilization of the energy harvester.

FLEHAP: A Wind Powered Supply for Autonomous Sensor Nodes

“…Such a circuit must be adapted to the specific characteristics of the device, and many different solutions have been proposed in the literature [15].…”

“…In our case, since we want to possibly obtain a voltage on the supercap higher than the peak value of the input, we chose a boost configuration [15][16][17] that, in its simplest form, consists of a switched inductor converter, as depicted in Figure 7. The red box on the left of the schematics contains the series V G , R S , and L S , which represents the electromagnetic generator obtained as the series wiring of the two coils described previously.…”

“…We can also define a duty cycle, D = t ON /t CK . the device, and many different solutions have been proposed in the literature [15].…”

“…In our case, since we want to possibly obtain a voltage on the supercap higher than the peak value of the input, we chose a boost configuration [15][16][17] Considering the inductive behavior of the generator coils, represented by the inductance and resistance in Figure 7, we can derive a model of the circuit, as seen by the generator, as an equivalent resistive load , . To this purpose, it is worth noting that, considering an ideal switch S1 with a zero value series resistance in the closed state, and a constant input voltage , the transient of the current flowing in the circuit follows an exponential behavior as the S1 closes, with a time constant = / and an asymptotic value = / .…”

Vibration Based Piezoelectric Energy Harvesting Utilizing Bridgeless Rectifier Circuit

“…Section 6 represents simulation results and finally, conclusion is given in section 7. (IRF7853) The power electronic circuit plays an important role between piezoelectric transducer and electronic load, which might include a battery (Szarka et al 2012) in energy harvesting system. The power electronic circuits are applied to rectified, step-up and regulate the power delivered to the load, and actively manage the electrical damping of the transducers so that maximum power could be transferred to the load (Cammarano 2010;Cheng 2007).…”