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A self-powered nonlinear piezoelectric vibration energy extraction circuit

A nonlinear energy, piezoelectric vibration technology, applied in the direction of generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, electrical components, etc., to improve the recovery power, ensure long-term stable operation, high Effect of output voltage

Active Publication Date: 2017-02-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, the complex power supply system and energy management system of the ESSH circuit make the final output voltage of the circuit only within a low range.

Method used

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  • A self-powered nonlinear piezoelectric vibration energy extraction circuit
  • A self-powered nonlinear piezoelectric vibration energy extraction circuit
  • A self-powered nonlinear piezoelectric vibration energy extraction circuit

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Embodiment Construction

[0028] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0029] Such as figure 1 As shown, a self-powered nonlinear piezoelectric vibration energy extraction circuit of this embodiment includes a nonlinear energy extraction and energy storage module, an extremum detection module, and a self-powered circuit module. Wherein, the nonlinear energy extraction circuit module includes a first piezoelectric element PZT1, an inductor L1, a switch S1 (including a first and a second analog switch), a switch S2 (a third analog switch), a charge extraction circuit module, a threshold control Circuit module (output control signal to switch SW2), flyback transformer (including primary side coil L2, secondary side coil L3), energy storage circuit. The extremum detection circuit module includes a piezoelectric signal sensing unit composed of the second piezoelectric element PZT2 and an extremum detection circuit, w...

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Abstract

The invention discloses a self-powered type nonlinear piezoelectric vibration energy extraction circuit. The circuit comprises a nonlinear energy extraction circuit module, an extremum detection circuit module and a power supply circuit module, wherein the nonlinear energy extraction circuit module is used to collect charges of a piezoelectric material, convert the charges into a direct current and output to an external load so as to carry out power supply, wherein the charges are generated because of strain; the extremum detection circuit module is used to detect a charge extremum on a piezoelectric material surface and emit a control signal so as to control on and off of the nonlinear energy extraction circuit; the power supply circuit module is used to provide power for low-power electronic devices in a nonlinear energy collection circuit module and the extremum detection circuit module. Compared to a standard circuit, by using the nonlinear energy extraction circuit provided in the invention, recovery power is greatly increased and a high output voltage is possessed; various kinds of power supply management modes can be matched; a wide application prospect is possessed for power supply of a wireless network sensing node.

Description

technical field [0001] The invention relates to a circuit for extracting vibration energy, in particular to a self-powered circuit for extracting environmental vibration energy by using piezoelectric materials. Background technique [0002] At present, wireless systems and micro-power electronic devices have been widely used in daily life. With the further development of micro-power electronic components, wireless network sensor systems are also widely used in various monitoring systems, such as large-scale Mechanical equipment, high-speed vehicles, field ecological environment, roads, bridges, reservoirs and other large buildings are monitored to improve the reliability of equipment operation and reduce maintenance costs. However, the vast majority of wireless sensor nodes are still powered by batteries. Due to the limited working life of batteries, wireless sensor nodes are not easy to install and need to be replaced regularly, which greatly increases the cost of equipment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N2/18H02M3/28
Inventor 季宏丽王玉霞裘进浩吴义鹏程衍伟
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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