Piezoelectric and electromagnetic hybrid frequency conversion micro power generation device and method

Abstract

The invention relates to a piezoelectric and electromagnetic hybrid variable-frequency micro-power generation assembly and a method for the same. The piezoelectric and electromagnetic hybrid variable-frequency micro-power generation assembly and the method are mainly used for collecting energy of a vibration environment. The piezoelectric and electromagnetic hybrid variable-frequency micro-power generation assembly comprises piezoelectric vibrators, a permanent magnet, coils, support plates, a fixed slider, a side beam and a movable slider. The piezoelectric vibrators vibrate so that piezoelectric energy can be collected; and electromagnetic energy is collected by means of changing the magnetic flux of each coil. The sliders move on the side beam, so that the span of a system is changed, the purpose of adjusting the resonant frequency of the assembly in a wide-range and high-precision manner is achieved, and the micro-power generation assembly is applicable to different working environments within a wide frequency range. Besides, the piezoelectric and electromagnetic hybrid variable-frequency micro-power generation assembly can be combined with a sensor applied to movement sensing, and has self-powered monitoring ability.

Description

technical field [0001] The invention relates to the application of miniaturized equipment and methods for collecting vibration energy in the environment, and is especially suitable for collecting environmental energy where the operating frequency changes greatly, and is suitable for integration with sensor applications. Background technique [0002] As a new monitoring technology, sensor network technology has a wide range of applications in production and life. For sensor networks, especially wireless sensor networks, energy supply has a great influence on it, and batteries are generally used for power supply. However, due to the monitoring location of wireless sensor network nodes in engineering, it is sometimes very difficult to replace the battery, and the service life of the battery is limited. Therefore, in order to realize the long-term effective work of the entire sensor network, prolong the application life of the wireless sensor network and reduce the cost, it is ...

AI Technical Summary

Problems solved by technology

However, in the actual application environment, the environmental vibration, such as the vibration of mechanical equipment, often changes, that is, the external operating frequency changes with time, and there is a problem that the natural frequency of the piezoelectric vibrator and the external excitation frequency are at non-resonance.

Piezoelectric materials are very sensitive to changes in frequency. Even if the difference between the external frequency and the natural frequency of the piezoelectric vibrator is small, its deformation will decrease rapidly and the power generation capacity will decrease rapidly.

Due to the structure of ordinary piezoelectric energy harvesting devices, the frequency range is small, and it is difficult to adapt to changes in the external environment.

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