KR20160136770A - Energy harvesting apparatus and method using micro bubble - Google Patents

Energy harvesting apparatus and method using micro bubble Download PDF

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Publication number
KR20160136770A
KR20160136770A KR1020150070757A KR20150070757A KR20160136770A KR 20160136770 A KR20160136770 A KR 20160136770A KR 1020150070757 A KR1020150070757 A KR 1020150070757A KR 20150070757 A KR20150070757 A KR 20150070757A KR 20160136770 A KR20160136770 A KR 20160136770A
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KR
South Korea
Prior art keywords
piezoelectric element
generated
fine bubble
piezoelectric
fine
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KR1020150070757A
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Korean (ko)
Inventor
정상국
전진표
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명지대학교 산학협력단
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Priority to KR1020150070757A priority Critical patent/KR20160136770A/en
Publication of KR20160136770A publication Critical patent/KR20160136770A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
    • H02N2/185—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators using fluid streams
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
    • H02N2/001—Driving devices, e.g. vibrators
    • H02N2/0015—Driving devices, e.g. vibrators using only bending modes

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  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)

Abstract

An energy harvesting apparatus and an energy harvesting method using fine bubbles are disclosed. An energy harvesting apparatus includes a piezoelectric element; And a fine bubble fixed to one end of the piezoelectric element; And a piezoelectric actuator disposed at a position facing the fine bubbles, wherein the piezoelectric element is a piezoelectric element that vibrates the micro bubble by a frequency generated according to a voltage applied to the piezoelectric actuator, And a rectifying circuit for rectifying the energy.

Description

TECHNICAL FIELD [0001] The present invention relates to an energy harvesting apparatus and an energy harvesting apparatus using micro bubbles,

The present invention relates to an energy harvesting apparatus using a fine bubble and a control method.

Recently, the interest in the development of wireless devices has increased, and energy harvesting technology is developing. Energy Harvesting is a technique for harvesting energy that is abandoned by using energy resources around it, which can be used to accumulate energy and use it at a necessary point in time.

As a result, technologies for harvesting energy from various energy sources have been developed, and studies using light energy, sonic energy, electromagnetic energy, and temperature gradients have been conducted to replace batteries.

In recent years, a technique using a piezoelectric element has attracted attention, and most of the studies have been conducted using a cantilever.

Most of the structures using conventional cantilevers are mainly using magnetic force or using the RI method (Radio isotope method). However, in the case of the research using the magnetic force, the structure of the experimental apparatus is complicated, and the manufacturing cost and the time consuming time are large. In the case of the RI method, energy can be harvested only when the bending speed is fast as a method of harvesting energy by changing the electrostatic capacity, which limits the application field.

The present invention provides an energy harvesting apparatus using fine bubbles and a control method thereof.

In addition, the present invention relates to an energy harvesting apparatus using fine bubbles capable of hobbling energy by attaching fine bubbles vibrating by a sound wave to a cantilever and using characteristics of bubbles having different degrees of vibration depending on the frequency and the size of bubbles And a control method thereof.

In addition, the present invention provides an energy harvesting apparatus using fine bubbles and a control method thereof, which can be applied to applications such as applications, sensors, and the like by finding conditions under which an optimal output voltage is derived and finally storing energy.

According to the first aspect, an energy harvesting apparatus using fine bubbles is provided.

According to the first embodiment, the piezoelectric element; A fine bubble fixed to one end of the piezoelectric element; And a piezoelectric actuator disposed at a position facing the fine bubble, wherein the piezoelectric element vibrates due to a frequency generated according to a voltage applied to the piezoelectric actuator, An energy harvesting apparatus including a rectifying circuit for rectifying electric energy can be provided.

The electric energy can be generated by micro-bending generated in the piezoelectric element by micro-streaming generated as the micro bubble vibrates.

The rectifying circuit may be formed inside the other end of the piezoelectric element. The energy harvesting apparatus according to claim 1, wherein the piezoelectric element is formed in a cantilever shape.

And a supporting portion for supporting the piezoelectric element, wherein the supporting portion can be coupled to the other end of the piezoelectric element.

The piezoelectric element and the fine bubble are placed in an aqueous solution.

The frequency is a sound wave having a frequency coinciding with the natural frequency of the fine bubble.

The magnitude of the generated electric energy may vary depending on the distance between the piezoelectric element and the piezo actuator.

And fine bubbles of different sizes may be formed at one end of the piezoelectric element according to the magnitude of the electric energy to be generated.

According to the second embodiment, a plurality of piezoelectric elements; A plurality of fine bubbles respectively fixed to respective ends of the plurality of piezoelectric elements; And a piezoelectric actuator disposed at a position facing the fine bubble, wherein the piezoelectric element vibrates due to a frequency generated according to a voltage applied to the piezoelectric actuator, An energy harvesting apparatus including a rectifying circuit for rectifying electric energy can be provided.

According to a second aspect, an energy harvesting method using fine bubbles is provided.

According to the first embodiment, there is provided an energy harvesting method using fine bubbles formed at one end of a cantilever-shaped piezoelectric element, the method comprising the steps of: applying a voltage to a piezoelectric actuator disposed at a position facing the fine bubble; And harvesting electric energy generated by vibrating the piezoelectric element as the fine bubble vibrates due to a frequency generated according to a voltage applied to the piezoelectric actuator.

In the step of harvesting the electric energy, the piezoelectric actuator may have a sound wave having a frequency coinciding with a natural frequency of the fine bubble according to an applied voltage.

The present invention provides an energy harvesting apparatus using a fine bubble and a control method therefor, and it is possible to attach a fine bubble vibrating by a sound wave to a cantilever and then use the characteristics of bubbles having different degrees of vibration depending on the frequency and the size of the bubble. You can harvest energy.

Further, the present invention can be applied to applications such as an application, a sensor, and the like by storing a final energy by searching for conditions under which an optimum output voltage is derived.

1 is a view showing the structure of an energy harvesting apparatus using fine bubbles according to a first embodiment;
Fig. 2 is a view for explaining the principle of driving fine bubbles according to the first embodiment; Fig.
3 is a view showing a microfluid generated in response to the vibration of the fine bubble according to the first embodiment;
4 is a result of testing the bending of the piezoelectric element according to the vibration of the fine bubble according to the first embodiment.
5 is a view showing the configuration of a rectifying circuit according to the first embodiment;
6 is a graph showing an output voltage / current according to a resistance using the rectifying circuit according to the first embodiment.
7 is a view showing the structure of an energy harvesting apparatus using fine bubbles according to the second embodiment;
8 is a graph illustrating an output voltage according to the number of fine bubbles according to the second embodiment.
9 is a flowchart showing an energy harvesting method according to the first embodiment;

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a view showing the structure of an energy harvesting apparatus using fine bubbles according to the first embodiment. FIG. 2 is a view for explaining the principle of driving fine bubbles according to the first embodiment. 4 is a graph showing a result of testing the bending of a piezoelectric element according to the vibration of a fine bubble according to the first embodiment, FIG. 6 is a graph showing the output voltage / current according to the resistance using the rectifying circuit according to the first embodiment, and FIG. 7 is a graph showing the output voltage / FIG. 8 is a graph illustrating an output voltage according to the number of fine bubbles according to the second embodiment. FIG.

1, an energy harvesting apparatus 100 using a fine bubble according to the first embodiment includes a support 110, a piezoelectric element 115, a fine bubble 120, and a piezo actuator 125, do.

The supporting portion 110 is a means for fixing one end of the piezoelectric element 115. One end of the piezoelectric element 115 is fastened and fixed to one surface of the supporter 110.

Further, one surface of the support 110 may further include a transfer member (not shown) so that the height of the piezoelectric element 115 can be adjusted.

Accordingly, the piezoelectric element 115 can be moved along one side of the supporting portion 110 while being fixed to one surface of the supporting portion 110. Thus, the piezoelectric element 115 can adjust the distance to the piezo actuator 125. [

In the first embodiment, the piezoelectric element is fixed on one side of the support 110, and the height of the piezoelectric element is adjustable through the transfer member. However, by changing the position of the piezoelectric actuator 125, It is of course also possible to adjust the distance between the piezo actuators 125.

The piezoelectric element 115 is a means for generating electric energy by a piezoelectric effect. Here, the piezoelectric effect shows that when mechanical pressure is applied to the piezoelectric element, electrical energy is generated, and when the electrical energy is applied, mechanical deformation occurs.

Electrical energy may be generated due to the mechanical deformation of the piezoelectric element 115.

More specifically, pressure is applied to the piezoelectric element 115 due to micro-steady flow caused by the vibration of the fine bubble 120 fixed to the other end of the piezoelectric element 115, and as a result, .

The piezoelectric element 115 is fixed to the support 110 in a cantilever shape to generate a mechanical deformation (bending) in the piezoelectric element 115 due to the micro steady flow generated by the vibration of the fine bubble 120 .

That is, one end of the piezoelectric element 115 may be fixed to the support 110.

The fine bubble 120 is formed at the other end of the piezoelectric element 115 and is a means for applying pressure to the piezoelectric element 115. The size of the fine bubbles 120 may be different depending on the electric energy to be generated.

The micro bubble 120 vibrates due to the frequency generated by the piezoelectric actuator 125 disposed at a position facing the micro bubble 120 and a micro steady flow occurs due to the vibration of the micro bubble 120. [ As a result, the piezoelectric element 115 is slightly bent and electrical energy is generated.

At this time, the piezoelectric element 115 and the fine bubble 120 can be placed in the aqueous solution.

1, a piezoelectric element 115 and a fine bubble 120 are positioned in a container containing an aqueous solution, and the fine bubble 120 includes a piezoelectric actuator 125 (not shown) located outside the container containing the aqueous solution, The sound waves are caused by the sound waves according to the frequencies generated by the sound waves.

Fig. 2 is a view for explaining the driving principle of the fine bubble according to the first embodiment.

As shown in FIG. 2, when the piezoelectric actuator 125 is applied with a voltage, the micro bubble 120 vibrates to a sound wave corresponding to a frequency generated by the applied voltage. Minute bending occurs in the piezoelectric element 115 due to the vibration of the fine bubble 120 generated at this time.

FIG. 3 shows the micro-flow generated by the vibration of the fine bubble 120 according to the first embodiment. As shown in FIG. 3, when micro-flow is generated according to the vibration of the micro bubble 120, the piezoelectric element 115 is slightly bent according to the generated micro-flow.

FIG. 4 shows an example of this.

4 (a1) shows a state in which no voltage is applied to the piezo actuator 125, and Fig. 4 (a2) shows a state in which a voltage is applied to the piezo actuator 125. Fig.

4B is an enlarged view of the fine bubble 120 in a state in which no voltage is applied to the piezo actuator 125. Fig. 4B2 shows the fine bubble 120 in a state where a voltage is applied to the piezo actuator 125. Fig. The bubble 120 is enlarged.

As shown in FIG. 4, when a voltage is applied to the piezoelectric actuator 125, the micro bubble 120 vibrates according to the generated sound wave, and as a result, the piezoelectric element is bent by about 10 um as a result . Electrical energy is generated due to mechanical deformation of the piezoelectric element 115.

A rectifying circuit for rectifying electric energy generated inside the piezoelectric element 115 can be connected from the outside of the piezoelectric element 115. [

Fig. 5 shows a rectifying circuit. A graph of the output voltage / power result according to the resistance using the rectifier circuit shown in Fig. 5 is shown in Fig. That is, a rectifier circuit is used to convert the AC voltage of the output voltage into the DC voltage and measure the voltage / current according to the resistance.

Piezoelectric actuator 125 is a means for generating a frequency in accordance with an applied voltage.

As shown in FIG. 1, the piezo actuator 125 is disposed at a position facing the fine bubble 120.

Unlike the fine bubbles 120, the piezoelectric actuator 125 is located outside the aqueous solution container, and the acoustic waves are transmitted to the fine bubbles 120 in accordance with the frequency generated according to the applied voltage. As a result, the fine bubble 120 vibrates, resulting in micro-steady flow, and mechanical deformation occurs in the piezoelectric element 115 to generate electrical energy.

The position of the piezo actuator 125 may be spaced apart from the micro bubble 120 by a predetermined distance and disposed at a position facing the micro bubble 120 in front.

In addition, the position of the piezo actuator 125 can be moved to adjust the distance to the fine bubble 120. Even if the position of the piezo actuator 125 is shifted, it can be moved on the position facing the fine bubble 120 for adjusting the distance between the piezo actuator 125 and the fine bubble 120.

FIG. 7 is a view showing an energy harvesting apparatus 700 according to the second embodiment. Referring to FIG. 7, the energy harvesting apparatus 700 according to the second embodiment may have a plurality of cantilevered piezoelectric elements 715.

Further, fine bubbles 720 may be formed at the other ends of the plurality of piezoelectric elements 715, respectively.

At this time, the positions of the fine bubbles 720 may be formed at the other end of the bottom surface of each piezoelectric element 115 so as to face the piezoelectric actuator 125, respectively.

Other configurations and operations are the same as those of the energy harvesting apparatus 100 described with reference to FIG. 1, so that redundant description will be omitted.

8 is a graph showing an output voltage according to the number of fine bubbles. As shown in FIG. 8, it can be seen that the output voltage increases as the number of vibrating fine bubbles 720 increases.

9 is a flowchart showing an energy harvesting method according to the first embodiment.

In step 910, a voltage is applied to the piezo actuator 125.

In step 915, the piezoelectric actuator 125 to which voltage is applied causes a sound wave having a frequency coinciding with the natural frequency of the fine bubble 120 to be excited.

In step 920, the fine bubbles 120 are vibrated by the sound waves excited by the piezoelectric actuator 125 to cause micro-steady flow, and the micro-steady flow causes the piezoelectric element 115 to bend finely to generate electrical energy.

The electrical energy generated in step 925 is harvested.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

100: energy harvesting device
110: Support
115: piezoelectric element
120: Fine bubble
125: Piezo actuator

Claims (12)

A piezoelectric element;
A fine bubble fixed to one end of the piezoelectric element; And
And a piezo actuator disposed at a position facing the fine bubble,
Wherein the piezoelectric element includes a rectifying circuit for rectifying electric energy generated by vibrating the piezoelectric element as the fine bubble vibrates due to a frequency generated according to a voltage applied to the piezoelectric actuator.
The method according to claim 1,
Wherein the electric energy is generated by micro-bending generated in the piezoelectric element by micro-streaming generated as the fine bubble vibrates.
The method according to claim 1,
Wherein the rectifying circuit is connected to the outside of the piezoelectric element.
The method according to claim 1,
Wherein the piezoelectric element is formed in a cantilever shape.
5. The method of claim 4,
And a support for supporting the piezoelectric element,
And the support portion is coupled to the other end of the piezoelectric element.
The method according to claim 1,
Wherein the piezoelectric element and the fine bubble are located in an aqueous solution.
The method according to claim 1,
Wherein the frequency is a sound wave of a frequency coinciding with the natural frequency of the fine bubble.
The method according to claim 1,
Wherein the magnitude of the generated electric energy varies depending on the distance between the piezoelectric element and the piezoelectric actuator.
The method according to claim 1,
And forms fine bubbles of different sizes at one end of the piezoelectric element according to the magnitude of the electric energy to be generated.
A plurality of piezoelectric elements;
A plurality of fine bubbles respectively fixed to respective ends of the plurality of piezoelectric elements; And
And a piezo actuator disposed at a position facing the fine bubble,
Wherein the piezoelectric element includes a rectifying circuit for rectifying electric energy generated by vibrating the piezoelectric element as the fine bubble vibrates due to a frequency generated according to a voltage applied to the piezoelectric actuator.
A method of energy harvesting using fine bubbles formed at one end of a cantilever-shaped piezoelectric element,
Applying a voltage to a piezoelectric actuator disposed at a position facing the fine bubble; And
And harvesting electric energy generated by vibrating the piezoelectric element as the fine bubble vibrates due to a frequency generated according to a voltage applied to the piezoelectric actuator.
12. The method of claim 11,
The step of harvesting the electrical energy comprises:
Wherein the piezoelectric actuator excites a sound wave having a frequency corresponding to a natural frequency of the fine bubble according to an applied voltage.

KR1020150070757A 2015-05-21 2015-05-21 Energy harvesting apparatus and method using micro bubble KR20160136770A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109149110A (en) * 2018-08-31 2019-01-04 捷信（浙江）通信技术有限公司 A kind of satellite Dynamic Tracking and antenna equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109149110A (en) * 2018-08-31 2019-01-04 捷信（浙江）通信技术有限公司 A kind of satellite Dynamic Tracking and antenna equipment
CN109149110B (en) * 2018-08-31 2021-09-03 捷信（浙江）通信技术有限公司 Satellite dynamic tracking method and antenna equipment

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