A low-power circuit for piezoelectric vibration control by synchronized switching on voltage sources

Abstract

b s t r a c tIn the paper, a vibration damping system powered by harvested energy with implementation of the socalled SSDV (synchronized switch damping on voltage source) technique is designed and investigated.In the semi-passive approach, the piezoelectric element is intermittently switched from open-circuit to specific impedance synchronously with the structural vibration. Due to this switching procedure, a phase difference appears between the strain induced by vibration and the resulting voltage, thus creating energy dissipation. By supplying the energy collected from the piezoelectric materials to the switching circuit, a new low-power device using the SSDV technique is proposed. Compared with the original selfpowered SSDI (synchronized switch damping on inductor), such a device can significantly improve its performance of vibration control. Its effectiveness in the single-mode resonant damping of a composite beam is validated by the experimental results.

Recent Progress in Piezoelectric Conversion and Energy Harvesting Using Nonlinear Electronic Interfaces and Issues in Small Scale Implementation

“…This solution for inverting the voltage across the piezoelectric element requires very low power as it does not need any external energy, except to control the digital switch. This autonomous voltage inverter can therefore be made self-powered [21,26,27,[32][33][34][35][36][37][38], consuming a very small amount of power (typically 3% of the electrostatic energy available on the active material); as will be discussed in Section 4.2. As the energy conversion gain is typically in the range of a factor of 20, this energy requirement can easily be neglected.…”

“…In terms of implementation issues, several architectures have been proposed to make the switch control autonomous [21,26,27,[32][33][34][35]. In these works, the extremum detection is usually designed by computing the derivative of the piezovoltage (which gives the extremum position when it cancels), but the derivative operator is not really stable and is sensitive to noise.…”

“…In this field, Guyomar et al introduced a simple, low-cost process to artificially enhance the coupling coefficient of electromechanical systems using piezomaterials [17][18][19][20][21][22]. Based on a simple nonlinear process of the output voltage of the active material, this approach, initially developed for vibration damping purposes [23][24][25][26][27], permits a gain of up to 20 in terms of energy conversion, and 10 in terms of harvested energy [28]. Several techniques derived from this original method have been proposed, each of them addressing a particular concern (broadband vibration, impedance matching, energy harvesting ability enhancement, etc.…”

An autonomous synchronized switch damping on inductance and negative capacitance for piezoelectric broadband vibration suppression

“…7. Similar to the techniques, the control strate closing the switch when the (20) which shows that the voltage on the piezoelectric patch is inverted and magnified by a factor of C p /(C n -C p ). This equation also shows that the magnitude of voltage on the piezoelectric patch is independent of the electrical quality factor of the circuit as compared to the SSDI technique.…”

“…The role of a microcontroller is taken up by a low pass filter in the autonomous shunts, thus making them ideal candidate for onboard applications [18]. Some examples of autonomous shunt can be found in Niederberger and Morari [18] who used an autonomous shunt based on SSDI technique while Shen et al [20] used an autonomous SSDV technique in which an additional vibrating structure was used to harvest energy for the voltage sources. A broadband vibration control using a self-powered SSDI technique was proposed by Lallart et al [19] who focused on the adaptive switching process.…”