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This paper presents a piezoelectric energy harvesting device applicable to wireless mouse (WM-PEH). Adding magnetic force to the excitation piezoelectric generating unit makes the impact better and more pronounced. The polygonal roller can increase the excitation frequency of the piezoelectric generating unit and broaden the energy collection range and capability of the WM-PEH. The theoretical and simulation analysis of WM-PEH was carried out in this paper. The effects of the length ratio of the exciter rod to the support frame and the circular impact area on the output characteristics of the prototype were discussed in the experiment. When the length ratio of the exciter rod and the support rod is 3:1, the activity increment of the exciter rod is the largest, and the maximum output voltage can reach 42 V and the maximum output power is 22.43 mW when it acts on a circular generator set with a radius of 1.5 mm. The design of the device is highly integrated with the wireless mouse that is widely used, and the piezoelectric energy harvesting mechanism and the wireless mouse are perfectly combined, which provides a scientific basis for the subsequent development of a self-powered wireless mouse. [ABSTRACT FROM AUTHOR]

Due to the great potential of rotary piezoelectric energy harvesters in environmental monitoring and energy harvesting, a great deal of research has been conducted by scholars. This paper presents a comprehensive review of the recent research progress of rotary piezoelectric energy harvesters in terms of literature background, excitation principles, practical applications and interface circuits. According to the different excitation methods, we divide the rotary piezoelectric energy harvester into centrifugal, impact, tensile (compression), magnetic and compound types, and describe and evaluate the different research results. Meanwhile the current potential applications of rotating piezoelectric energy harvesters can be divided into three categories: wearable devices, vehicle wheels and other applications, and the corresponding research progress is reviewed. Through the review and analysis of different excitation modes, application scenarios and the back-end energy interface circuits, the reference is improved for the design and research of the rotary piezoelectric energy harvester with high output performance. In addition, this paper also proposes future research directions and challenges. [Display omitted] [ABSTRACT FROM AUTHOR]

In this paper, a low frequency non-contact rotary piezoelectric energy harvester excited by magnetic coupling (L-PEH) was proposed. Through the coupling between the magnet inside the rotor driven by rotating motion and the magnet on the piezoelectric plate, the process of rotating motion transforming into electrical energy was realized. The purpose of this paper was to improve the output performance of piezoelectric energy harvester at low frequency by optimizing the magnetic field conditions, so the influence of the number of magnets and the arrangement of magnets on the output performance was studied in detail. A series of theories, simulations and experiments proved that the alternative magnet arrangement (mode 1) could optimize the output performance of the L-PEH. When the arrangement of magnets was mode 1 and the number of magnets was 2, the peak-to-peak voltage of rectangular and circular piezoelectric plates was 182.5 V and 4.4 V at 250r/min. Under the above optimal parameter variables, the L-PEH could generate the maximum output power of 140.45 mW. In addition, the output power generated by the prototype could fully meet the power consumption of low-power electronic equipment such as light-emitting-diodes (LEDs). In general, by changing the number and arrangement of magnets, i.e. optimizing the magnetic field conditions, L-PEH could effectively collect rotational energy and had a good application prospect in the power supply of micro electronic equipment. • The prototype improves the energy harvesting efficiency at low frequencies. • The prototype can power low-power electronic devices. • The effect of changing magnetic field conditions on the performance is discussed. • The optimum output power of the prototype is 140.45 mW. [ABSTRACT FROM AUTHOR]