proposed an up-conversion energy collector, which uses a rolling bead. The device has non-resonant characteristics. A free-moving ball periodically hits two magnets on a spring, causing them to vibrate at high frequencies. proposed a kind of up-conversion energy harvester. The contact method is realized by mechanical means. Thus, people have put forward the capture energy structure with up-frequency conversion, including the contact type and noncontact type. īecause environmental vibration is usually low frequency (0–30 Hz), and the natural frequency of the energy harvester is usually high, making the frequency of the energy collector resonant with the vibration of the environment is one of the most prominent problems in energy-acquisition power generation. Among them, electromagnetic energy harvesters are used because of their large current, small internal resistance, ease of fabrication and other characteristics. In addition, hybrid energy harvesters have also been studied. Typical energy harvesters studied to obtain energy from the environment are piezoelectric energy harvesters, electromagnetic energy harvesters and electrostatic energy harvesters. In recent years, the use of environmental vibration power generation has become favoured, and it is a very promising power supply method. The experimental results show that the electromagnetic tuning fork frequency-adjustable conversion energy harvester can make the LED lamp work. The peak power is 23.59 mW at 9.2 Hz, the power increases by 14.85 mW, and the power density increases by 169.88%. In addition, the output power and power density are significantly increased compared to a piezoelectric tuning fork energy harvester of the same size. The operating frequency of the centre can be easily switched from 9.2 to 20 Hz, enabling the application of multiple excitation frequencies. The frequency-adjustable tuning fork electromagnetic energy harvester significantly increases the range of frequencies used. In the frequency-adjustable range, it can make the energy harvester resonant with the environment excitation, and the output frequency stays the same. The electromagnetic vibration energy harvester can adjust its natural frequency according to a change in the environmental excitation frequency without any change to the structure. In this paper, a frequency-adjustable tuning fork electromagnetic energy harvester is introduced.
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