Self-powered CMOS piezoelectric vibration energy harvester

Abstract

The invention discloses a self-powered CMOS piezoelectric vibration energy harvester. The self-powered CMOS piezoelectric vibration energy harvester is characterized in that the self-powered CMOS piezoelectric vibration energy harvester includes a CMOS piezoelectric synchronous charge extraction and collection interface circuit and a follow current energy storage circuit; the CMOS piezoelectric synchronous charge extraction and collection interface circuit is encapsulated in the form of an integrated circuit form; the CMOS piezoelectric synchronous charge extraction and collection interface circuit is provided with a first detection circuit output control interface, a second detection circuit output control interface, a first piezoelectric element connection interface, a second piezoelectric element connection interface, a first capacitance detection interface, a second capacitance detection interface, an external-connection inductance interface and a grounding port; the CMOS piezoelectric synchronous charge extraction and collection interface circuit includes a positive extremum detection module, a negative extremum detection module, a positive and negative extremum interlock switch, a positive and negative direction vibration automatic switching switch and a dynamic substrate level selection module. The self-powered CMOS piezoelectric vibration energy harvester has the advantages of easiness in integration, small circuit size, low power consumption and high energy extraction efficiency; and a self-powered design is adopted, so that the self-powered CMOS piezoelectric vibration energy harvester further has the advantage of no need for an external power source.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a self-powered CMOS piezoelectric vibration energy collector. Background technique [0002] Vibration energy exists in almost any environment, such as water, air flow in nature, vibration of industrial machines, vibration during operation of vehicles, human movement, even breathing, heartbeat, etc. Piezoelectric vibration energy harvesters use the positive piezoelectric effect of piezoelectric materials to convert vibration energy in the environment into electrical energy. Piezoelectric vibration energy harvesters have the advantages of high energy density, simple structure, long life, and easy integration, and are widely used in contemporary micro-power mobile and wearable electronic devices. [0003] Due to the vibration, the output voltage of the piezoelectric element is alternating, and the power supply of common microelectronic devices requires a stable DC volta...

AI Technical Summary

Problems solved by technology

[0005] Synchronous switch inductor circuit (P-SSHI) and series synchronous switch inductor circuit (S-SSHI) recover power is still greatly affected by the back-end capacitor voltage and load impedance; synchronous charge extraction circuit (SECE), double synchronous switch circuit ( DSSH), Enhanced Dual Synchronous Switch Inductance Recovery Circuit (ESSH) and Optimized Synchronous Charge Extraction Circuit (OSECE) solve this problem. It is very advantageous, but the actual implementation is either too complicated, or its own circuit cannot complete the acquisition alone, and needs to be powered by an external power supply, or the circuit is large in size and difficult to integrate due to the need for more discrete components, so it is difficult to promote

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