Self-powered power supply management circuit applied to discontinuous piezoelectric energy acquisition system

Abstract

The invention discloses a self-powered power supply management circuit applied to a discontinuous piezoelectric energy acquisition system, which is used for solving the technical problem of large energy consumption of the prior power management circuit. The technical scheme is that the system composed of three modules: a full-bridge rectifier, power levels of Buck-boost type DC switching converter and a switch signal controller. The input end of the full-bridge rectifier is directly connected with the output electrode of the piezoelectric converter, and the output voltage of the piezoelectric converter is rectified and output to the Buck-boost type DC switching converter. The output of the switching signal controller is connected to a grid of switching tube NM1 of power levels of Buck-boost type DC switching converter, which is used to control the Buck-boost type DC switching converter for charging energy storage device. When the power output of the piezoelectric converter is too small, the power management circuit stops working and goes into sleep mode to reduce power consumption.

Description

technical field [0001] The invention relates to a power management circuit, in particular to a self-powered power management circuit applied to a discontinuous piezoelectric energy collection system. Background technique [0002] Document 1 "Resistive impedance matching circuit for piezoelectric energy harvesting, Journal of Intelligent Material Systems and Structures, September 2010, Vol.21, pp.1293-1302" discloses a piezoelectric energy harvesting circuit for continuous vibration sources. According to the principle that the maximum energy transmission can be realized when the impedance is matched, the circuit makes the input impedance of the DC-DC switching converter match the output impedance of the piezoelectric material, and improves the collection efficiency of the piezoelectric energy collection system. The circuit has the characteristics of simple structure and low power consumption. However, the disadvantage of this circuit solution is that when there is no externa...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this circuit scheme is that when there is no external input energy, the power management circuit still continues to work, which wastes electric energy and reduces the efficiency of the energy harvesting system.

In addition, the circuit cannot be self-starting and self-powered, and requires an external power supply

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