Abstract
Existing piezoelectric vibration energy harvesting circuits require auxiliary power for the switch control module and are difficult to adapt to broadband piezoelectric vibration energy harvesters. This paper proposes a self-powered and low-power enhanced double synchronized switch harvesting (EDSSH) circuit. The proposed circuit consists of a low-power follow-up switch control circuit, reverse feedback blocking-up circuit, synchronous electric charge extraction circuit and buck-boost circuit. The EDSSH circuit can automatically adapt to the sinusoidal voltage signal with the frequency of 1 to 312.5 Hz that is output by the piezoelectric vibration energy harvester. The switch control circuit of the EDSSH circuit works intermittently for a very short time near the power extreme point and consumes a low amount of electric energy. The reverse feedback blocking-up circuit of the EDSSH circuit can keep the transmission efficiency at the optimal value. By using a charging capacitor of 1 mF, the charging efficiency of the proposed EDSSH circuit is 1.51 times that of the DSSH circuit.
Highlights
The self-powered wireless sensor which can automatically obtain electric energy from ambient vibration has great application prospects in the field of structural health detection [1,2,3]
This paper proposes a low-power high-efficiency adaptive double synchr FFsiiwgguuirrteec1h1. .ShcSahcrehmveeamtsiatcitdnicigadgcriaaimrgcruoafimtthfeooDfrtShbSeHroDcaiSrdcSubHiat.ncidrcPuEit.Hs based on DSSH called an enhanced synchronized switch harvesting (EDSSH) circuit
In order to verify that the RFBC in the enhanced double synchronized switch harvesting (EDSSH) circuit can make the circuit maintain toFhuiegtuporupett9imv. oWalltaaevgleeefcotwrrmiacsveoenffeotrergrmmy ihonafarlcsvaeopsfatTicnSiXgto3er3f9fiC.ciiwenacsy,mtaekaisnugrethdeiLn1o-Cnieceirnceurigtyashaanrveexsatminpglec,ytchlee (0.01 s) when DSSH circuit was not configured with D5 (Figure 11a) and EDSSH circuit was configured with D5 (Figure 11b)
Summary
The self-powered wireless sensor which can automatically obtain electric energy from ambient vibration has great application prospects in the field of structural health detection [1,2,3]. Several methods have been proposed by researchers to improve the energy conversion efficiency and expand the band of the operation frequency of VEHs. One of the approaches is frequency tuning, such as mechanical tuning [31,32,33,34,35], circuit tuning and magnetic tuning [36,37,38,39]. There are special requirements for piezoelectric energy harvesters (PEHs) and their electric energy harvesting circuits due to the wide range of vibration frequency and large load range of actual working environment. A low-power high-efficiency adaptive energy harvesting circuit which can match the PEH with wide operation frequency band and load range is the key to the practical application of the piezoelectric system. Let the energy conversion coefficient of Cp-L1 circuit loop be γ1, the electric energy transferred to the inductor L1 at this time is:
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