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Piezoelectric energy collection interface circuit based on inductor and capacitor multi-step turnover

A piezoelectric energy and interface circuit technology, applied in battery circuit devices, circuit devices, piezoelectric effect/electrostrictive or magnetostrictive motors, etc., can solve problems such as low rectification efficiency and limited energy extraction, and achieve energy reduction Loss, large applicability, effect of improving collection efficiency

Pending Publication Date: 2021-11-30
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The full-bridge rectifier circuit is the most commonly used interface circuit. Its structure is simple and reliable, but its low rectification efficiency limits its energy extraction from piezoelectric sensors.

Method used

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  • Piezoelectric energy collection interface circuit based on inductor and capacitor multi-step turnover
  • Piezoelectric energy collection interface circuit based on inductor and capacitor multi-step turnover
  • Piezoelectric energy collection interface circuit based on inductor and capacitor multi-step turnover

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Experimental program
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Effect test

Embodiment

[0033] It should be noted, figure 1 It is a schematic diagram of the piezoelectric energy harvesting interface circuit based on multi-step flipping of inductance and capacitance proposed by the present invention, "..." indicates that the off-chip flipping capacitors can continue to be expanded to 2n, and the following n=1 means that the number of off-chip flipping capacitors is 2, The number of switches is 8 for example.

[0034] When the current source IP crosses the zero point, the adaptive pulse generation module generates 3 pulse signals and transmits them to the logic control module for logic operation, and finally outputs the control signals of 6 switches to the switch flipping array. The specific flipping process:

[0035] Assuming that the potential VP>VN, flip from VP to VN, the current loop in the first step is VP→Sp→D2→Sn→L→S1→C1→S1→VN;

[0036] Step 2 The current loop is VP→Sp→D2→Sn→L→Sq→VN;

[0037] Step 3 The current loop is VP→S2→C2→S2→D2→Sn→L→Sq→VN.

[0038...

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Abstract

The invention discloses a piezoelectric energy collection interface circuit based on inductor and capacitor multi-step turnover, which is provided with a current source bias circuit for supplying power to the piezoelectric energy collection interface circuit, and comprises a source rectifier module, a self-adaptive pulse generation module, a switch signal control module, a piezoelectric sensor and a synchronous switch turnover array. The synchronous turnover of the inductor and the capacitor realizes the efficient transfer of charges on the parasitic capacitor in the piezoelectric sensor, and the multi-step turnover effect can effectively reduce the inductive current in the turnover process, thereby reducing the energy loss on the parasitic capacitor, and greatly improving the energy collection efficiency. Moreover, the circuit can be suitable for stray capacitance values and inductance values of piezoelectric sensors in a certain range, can be suitable for most piezoelectric sensors on the market, has high applicability, and has the characteristics of self power supply and cold start.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a piezoelectric energy collection interface circuit based on multi-step inversion of inductance and capacitance. Background technique [0002] The piezoelectric energy harvesting system is a synthesis of many disciplines such as mechanics, electricity, materials, and integrated circuit design. Its basic principle is to convert mechanical energy into electrical energy through the piezoelectric effect of piezoelectric materials and store it. After processing, it is transformed into a corresponding power supply voltage to supply power to some low-power sensor nodes. The interface circuit is a bridge between the piezoelectric sensor and the power management circuit. It can convert the AC output of the piezoelectric sensor into a DC output through the rectifier circuit, thereby storing electric energy for the energy storage element, and outputting DC through the power mana...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/18H02J7/32H02J7/34
CPCH02N2/186H02J7/32H02J7/345
Inventor 郭建平王储辉
Owner SUN YAT SEN UNIV