Abstract
In this paper, a novel tuning fork structure for self-frequency up-conversion is proposed. The structure has an in-phase vibration mode and an anti-phase vibration mode. The in-phase vibration mode is used to sense the environment vibration, and the anti-phase vibration mode is used for energy conversion and power generation. The low-frequency energy collection and the high-frequency energy conversion can be achieved simultaneously. Theoretical and experimental results show that the tuning fork frequency up-conversion energy harvester has excellent performance. This structure provides the energy harvester with excellent output power in a low-frequency vibration environment. At the resonant frequency of 7.3 Hz under 0.7 g acceleration, the peak voltage is 41.8 V and the peak power is 8.74 mW. The tuning fork frequency up-conversion energy harvester causes the humidity sensor to work stably. The structure has the potential to power wireless sensor nodes or to be used as a small portable vibration storage device, especially suitable for the monitoring of the environment related to human movement.
Highlights
With the development of electronic technology, the energy demand of micro-power devices is decreasing, and it is possible to harvest energy from the environment to power these devices. [1,2]
Considerable progress has been made in the research of piezoelectric energy harvesters over the past several decades, the traditional piezoelectric structure has a high natural frequency
When a traditional piezoelectric energy harvester is applied in a lowfrequency environment, the output power is too low to operate stably with electrical appliances
Summary
With the development of electronic technology, the energy demand of micro-power devices is decreasing, and it is possible to harvest energy from the environment to power these devices. [1,2]. When the FUC energy harvester is applied in a low-frequency environment, it can achieve a high-frequency vibration close to its natural frequency and improve the output power. Halim et al [42] proposed a frequency up-conversion piezoelectric vibration energy harvester driven by mechanical impact, employing a horizontally extended tip mass of a low-frequency driving beam to impact repeatedly on the free ends of two high-frequency unimorph-generating beams at the same time. The anti-phase vibration mode describes the closing or opening of the tuning fork arms, and the tuning fork handle is not involved Structure of the tuannintgi-pfohrakseenveribgyrahtiaorvnemsteord. e is the vibration of two masses around the midline
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