Abstract
This paper describes the design and practical application of a dual-stage H-Bridge (DSHBR) circuit to reduce the rectification losses and mitigate ripples in piezoelectric energy harvesting. The proposed DSHBR circuit integrates both AC-DC and DC-DC conversion processes using bidirectional switches and a step-up DC-DC converter, which applies to both positive and negative half cycles. One additional feature is that it does not require external power to turn on the bidirectional switches (V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sub> <; 0.3 V). Such feature facilitates active rectification at very low AC voltages (V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ac</sub> <; 0.5) generated by the piezoelectric device (PD). To validate the performance of the proposed circuit, a series of experimental tests were conducted. Firstly, the performance of circuit on rectifying the PD output was investigated using a shaker to generate high and low frequency excitations. Next, real-life testing was conducted with human arm motion as the source of excitation. Then, the ability of the entire system to charge solar batteries was investigated. The outcome shows that the DSHBR circuit prominently increased the rectified voltage and the output power while stabilising the DC voltage when compared with the conventional H-Bridge circuit.
Highlights
In recent years, human beings are witnessing a rapid increase in the usage of renewable energy sources (RES), such as solar [1], wind [2], thermal [3] and mechanical energy (ME) [4]
The results showed that their proposed circuit notably increased the voltage and the power produced from the piezoelectric device (PD) in comparison with the conventional full-wave bridge rectifier (FBR) circuit
Test 1 (SIV, high frequency) The rectified voltage and output power acquired from Test 1 are described within the context of Figs. 11 (a) and (b)
Summary
Human beings are witnessing a rapid increase in the usage of renewable energy sources (RES), such as solar [1], wind [2], thermal [3] and mechanical energy (ME) [4]. The proposed circuit required an external power supply to operate the switching process, which was not practical Another dual-stage rectifier circuit was proposed by [22]. There is a need to design an electronic circuit to bridge the abovementioned literature gap associated with the mechanical and electronics interface This is attempted in this study with the proposition of a self-powered dual-stage H-Bridge (DSHBR) circuit. The key difference between the previous H-Bridge circuit and the currently proposed circuit is that the H-Bridge circuit is single stage, which only converts ACDC, while the proposed DSHBR includes two stages (Stage 1: AC-DC conversion with reduced conversion/rectification losses, Stage 2: DC-DC conversion with rectified voltage stabilisation). The feasibility of using the output power to charge a solar battery was studied
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