Loading [a11y]/accessibility-menu.js
27.2 An Adiabatic Sense and Set Rectifier for Improved Maximum-Power-Point Tracking in Piezoelectric Harvesting with 541% Energy Extraction Gain | IEEE Conference Publication | IEEE Xplore

27.2 An Adiabatic Sense and Set Rectifier for Improved Maximum-Power-Point Tracking in Piezoelectric Harvesting with 541% Energy Extraction Gain


Abstract:

Piezoelectric energy harvesters (PEHs) convert mechanical energy from vibrations into electrical energy. They have become popular in energy-autonomous IoT systems. Howeve...Show More

Abstract:

Piezoelectric energy harvesters (PEHs) convert mechanical energy from vibrations into electrical energy. They have become popular in energy-autonomous IoT systems. However, the total energy extracted by a PEH is highly sensitive to matching between the PEH impedance and the energy extraction circuit. Prior solutions include the use of a full-bridge rectifier (FBR) and a so-called synchronous electric-charge extraction (SECE) [1], and are suitable for non-periodic vibrations. However, their extraction efficiency is low since the large internal capacitance Cp (usually 10's of nF) of the PEH (Fig. 27.2.1) prevents the output voltage from reaching its maximum power point (MPP) under a typical sinusoidal and transient excitation (VMPP = 1/2·IpRp). A recently proposed technique [2,3,4], called bias-flip, achieves a higher extraction efficiency by forcing a predetermined constant voltage at the PEH output, Vp, which is then flipped every half-period of the assumed sinusoidal excitation (Fig. 27.2.1, top left). To flip Vp, the energy in capacitor Cp is extracted using either a large external inductor [2,3] or capacitor arrays [4]. It is then restored with the opposite polarity (Fig. 27.2.1, top). However, VMPP of the PEH varies with sinusoidal current Ip; hence, the two fixed values of Vp in the flip-bias technique either over or underestimate VMPP for much of the oscillation cycle (pattern filled regions in Fig. 27.2.1, top right). In addition, none of the prior approaches compensate for VMPP-waveform amplitude changes, due to input intensity variations or decaying oscillations after an impulse, further degrading efficiency.
Date of Conference: 17-21 February 2019
Date Added to IEEE Xplore: 07 March 2019
ISBN Information:

ISSN Information:

Conference Location: San Francisco, CA, USA

References

References is not available for this document.