Piezoelectric expandable energy collection interface circuit based on MPPT

Abstract

The invention discloses a piezoelectric expandable energy collection interface circuit based on MPPT. The piezoelectric expandable energy collection interface circuit comprises expandable piezoelectric transducers, expandable peak detection switches, an LC resonant inductor, a rectifying circuit, a rectifying capacitor, a DC-DC conversion chip and an energy storage capacitor, wherein the number ofthe expandable peak detection switches corresponds to the number of the piezoelectric transducers, and the maximum power point tracking (MPPT) module is composed of a peak voltage tracking circuit and a hysteresis voltage comparator. The expandable piezoelectric transducers, the expandable peak detection switches, the LC resonant inductor, the rectifying circuit and the rectifying capacitor forman expandable series synchronous switch inductor energy collection interface circuit. The maximum power point tracking (MPPT) module detects peak open-circuit voltage of the piezoelectric transducersand voltage at two ends of the rectifying capacitor during normal operation of the expandable series synchronous switch inductance energy collection interface circuit, and keeps the voltage of the rectifying capacitor near the maximum output power by controlling the DC-DC conversion chip. The circuit can be completely self-powered, so that the energy collection efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric vibration energy collection, in particular to a piezoelectric expandable energy collection interface circuit based on maximum power point tracking (MPPT). Background technique [0002] Today's world is facing serious problems such as energy shortage and environmental pollution. The development and utilization of new energy to replace traditional energy is an effective way to solve these problems. There are solar energy, vibration energy, thermal energy, radio wave energy and other energies in nature. Harvesting and storing energy in nature and utilizing it has broad engineering application prospects. [0003] Among various forms of environmental energy, vibration energy is ubiquitous in nature, such as vibrations brought about by human movement, vehicle operation, industrial machine operation, and air and water in nature. The collection of vibration energy is not limited by factors such as ...

AI Technical Summary

Problems solved by technology

The series synchronous switch inductance energy harvesting interface circuit makes the piezoelectric output voltage and output current in phase, so that more mechanical energy can be converted into electrical energy, but this circuit still has the problem of impedance matching, and at the same time, it is necessary to propose a precise switch control strategy

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