Piezoelectric electromagnetic hybrid energy harvester energy management circuit for powering wireless sensors

Abstract

The invention discloses an energy management circuit supplying power to a wireless sensor of a piezoelectric electromagnetic composite energy harvester. Currently, no energy management circuit which is used for integrating alternating current of the piezoelectric electromagnetic energy harvester into a path and efficiently supplying power to the wireless sensor. An energy collection circuit of thepiezoelectric energy harvester is used for converting the alternating current of the piezoelectric energy harvester to direct current after rectification and voltage stabilization, the energy collection circuit of the electromagnetic energy harvester is used for rectifying and filtering the alternating current of the electromagnetic energy harvester and converting the alternating current to the direct current by a diode and by voltage rising and stabilization, an output end of the energy collection circuit of the piezoelectric electromagnetic energy harvester is connected with a positive electrode of a supercapacitor by a diode, an energy sensing interface circuit supplies power to the wireless sensor when voltages of two ends of the supercapacitor are higher than a reset threshold, and the connection between the supercapacitor and the wireless sensor is cut off when the voltages of the two ends of the supercapacitor are lower than a working voltage of the wireless sensor. The alternating current of the piezoelectric electromagnetic energy harvester is integrated to one path for storage, and the power supply demands of a large part of wireless sensors are satisfied.

Description

technical field [0001] The invention belongs to the field of micro-energy devices, and in particular relates to an energy management circuit of a piezoelectric electromagnetic composite energy harvester capable of supplying power to wireless sensors, and the circuit can meet the power supply requirements of most existing wireless sensors. Background technique [0002] With the rapid development of wireless sensors, microelectronic processing technology and the emergence of various low-energy components, the wireless sensor power supply technology based on vibration energy harvesters has been deeply studied by scholars. According to the energy conversion mechanism of the vibration energy harvester, it is mainly divided into four types: piezoelectric, electromagnetic, electrostatic and magnetostrictive, among which piezoelectric and electromagnetic are the most widely used. [0003] Compared with the single energy harvesting mechanism, the piezoelectric electromagnetic composi...

AI Technical Summary

Problems solved by technology

Because the AC energy is small, and the output electrical signal of the piezoelectric energy harvester has the characteristics of high voltage and low current, while the output electrical signal of the electromagnetic energy harvester has the characteristics of low voltage and high current, it cannot be directly used by wireless sensors

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