At present, with the rapid development of MEMS technology and the increasing investment of countries in the field of micro-systems, various forms of micro-energy are emerging one after another. In different micro-devices and micro-systems, how to fully utilize these micro-energy sources to supply energy to the load is one of the urgent problems to be solved, such as industrial automation, implantable medical devices, wireless network sensors, etc. Timed transduction and power-on not only wastes financial and material resources, but also causes patient suffering and equipment loss. In view of the minimal but continuous characteristics of micro-energy output, this paper designs a new type of micro-power smart power management control circuit to store a continuous amount of electrical energy, and then use the intermittent output of large power to achieve Applicable purpose. In this paper, a piezoelectric vibrating generator is taken as an example to illustrate the circuit design of the system.
2 Principle and output characteristics of piezoelectric vibrating generator
According to the energy conversion mechanism, the vibrating generator can be divided into three types: piezoelectric type, electromagnetic type and electrostatic type. Among them, piezoelectric vibrating generator has become one of the hotspots of micro-generator research because of its simple structure, high energy density and easy miniaturization. 1 is a schematic view of a piezoelectric vibration type cantilever beam piezoelectric generator. The cantilever beam, the support and the mass block constitute a main frame structure of the generator. The intermediate layer metal layer is a common electrode of the upper and lower piezoelectric material piezoelectric layers, and a metal thin film PZT as an extraction electrode is provided at the top of the upper piezoelectric layer and the bottom of the lower piezoelectric layer. The mass is located at the free end of the cantilever beam and the other end of the cantilever beam is fixed to the support. As the environment vibrates, the cantilever beam deforms, and due to the positive piezoelectric effect, a varying potential difference will be generated to power the load. When the external environment vibration frequency and the cantilever beam natural frequency are the same, it will cause the cantilever beam to resonate, and the piezoelectric layer stress and strain change the most, so that the generator output voltage changes to the maximum, and the double-degree-of-freedom model is shown in Figure 2. Show.
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