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Abstract
This paper describes an improved non-linear switching circuit (INLSC) for active rectification of voltage and reduction of ripples in the voltage waveform for the piezoelectric energy harvesting (PEH) system. The proposed converter controls the alternating current (AC) generated by the piezoelectric device (PD) under mechanical vibration. The proposed circuit combines the boost and buck-boost processes through a switching process, which functions in both positive and negative cycles. In addition, it controls the voltage and frequency of the load capacitor. In this process, the passive components in the circuit are energised by being short with the AC voltage using switching signals, which facilitates the active rectification of ultra-low AC voltage. Design considerations, theoretical analysis, simulations and experimental results are presented. It was shown that the circuit was able to control the switching signal and to convert low AC voltage (0.44 Vi) to high direct current (DC) voltage (6.5 Vdc) while achieving an output power of 469 µW which outperforms the existing similar circuits and synchronous rectifier circuit. The ripples in the rectified voltage were also comparatively less. Application-wise, the proposed circuit could power a manually connected 7-segments display, commonly used for traffic applications.
Highlights
Power electronic circuits play a significant role in the piezoelectric energy harvesting (PEH) system by acting as a mediator to convert the alternating current (AC) voltage, which is generated by piezoelectric device (PD) from mechanical energy (ME) [1,2,3] into direct current (DC) voltage
The simplest one is a conventional full-bridge rectifier (FBR) circuit. Despite their simplicity and popularity, this rectifier circuit suffers from several limitations: (1) It comprises of diodes, which results in unavoidable voltage drop across them; (2) it does not step up the voltage of PD, which limits its application as most of the electronic devices require 2–3 Vdc ; (3) the presence of ripple voltage (Vr ) in the converted voltage waveform
The power extracted from the PD through the proposed circuit was piezoelectric cantilever beam was made up of an aluminium beam
Summary
Power electronic circuits play a significant role in the piezoelectric energy harvesting (PEH) system by acting as a mediator to convert the AC voltage, which is generated by PD from mechanical energy (ME) [1,2,3] into direct current (DC) voltage. DC is by using a dual-stage converter [21] This circuit achieved maximum flowing into the storage by controlling the ripples of the output. The proposed power flowing into thevery storage by controlling dual-stage circuit was complex and costly.the ripples of the output. [22,26,27,28,29,30], is that the V proposed circuit i , and achieves maximum output power, which is notcycle possible by the abovementioned circuits efficiently works with the duty of 50%, input voltage of 0.44literature. Energies 2022, 15, 709 as a primary rule, an active and non-linear rectifier circuit is desired to achieve a high rectified voltage (HRV) and high output power (HOP) with only 50% of the duty cycle. Application, which is not not attempted in the literature, is alsoout presented in the A proposed attempted in the literature, is presented in the proposed study
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