KR101682961B1 - Piezoelectric power generator - Google Patents
Piezoelectric power generator Download PDFInfo
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- KR101682961B1 KR101682961B1 KR1020150127370A KR20150127370A KR101682961B1 KR 101682961 B1 KR101682961 B1 KR 101682961B1 KR 1020150127370 A KR1020150127370 A KR 1020150127370A KR 20150127370 A KR20150127370 A KR 20150127370A KR 101682961 B1 KR101682961 B1 KR 101682961B1
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- 238000003306 harvesting Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 4
- 238000010248 power generation Methods 0.000 description 21
- 239000000463 material Substances 0.000 description 9
- 239000000919 ceramic Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000010287 polarization Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
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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
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- H01L41/047—
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- H01L41/083—
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- H01L41/113—
Abstract
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric power generating apparatus, and more particularly, to a piezoelectric power generating apparatus including a structure capable of generating 15 modes of the piezoelectric element.
A piezoelectric power generating apparatus according to an embodiment of the present invention includes: a first elastic member which is sequentially stacked on an upper surface of a structure; A piezoelectric element; And a second elastic member, wherein the piezoelectric element comprises: a piezoelectric body; A pair of first electrode patterns arranged to overlap with each other in the vertical direction so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body; And second electrode patterns arranged so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body in an overlapped manner in the vertical direction and arranged in an interdigitated manner with each of the first electrode patterns, Wherein the elastic member and the second elastic member have a long rod shape and one end is attached to the upper surface of the structure and the other end is not supported by the structure, and the first elastic member and the second elastic member The masses are attached to the ends of the first and second elastic members which are not supported by the structures of the first and second elastic members, The upper surface of the portion which is not supported by the at least one of the elastic member and the second elastic member An additional piezoelectric element is disposed on at least one of the lower surface and the lower surface of the piezoelectric element, and energy harvesting by the piezoelectric element is performed by using vibration energy of the structure and mass energy.
While the present invention claims a piezoelectric strategy generating device, it may also be used as an actuator according to an embodiment.
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric power generating device, and more particularly to a piezoelectric power generating device including a structure capable of generating power in 15 modes and 33 modes of a piezoelectric device.
Energy harvesting means converting A energy into B energy of a different nature, such as converting solar energy into electrical energy, for example.
The piezoelectric energy harvesting refers to the conversion of external mechanical energy into electrical energy by the deformation of the piezoelectric material, using piezoelectric materials as a mediator of electro-polarization when mechanical deformation is applied from the outside.
Such energy harvesting technology is used for generating electric power in mobile communication devices or mobile phones without using any electric power.
Piezoelectric materials convert mechanical force (stress) into electrical signal (voltage), or electrical signal into mechanical force. Piezoelectric ceramics, which are currently made of ceramics, It is widely used. Generators that generate electricity using such piezoelectric ceramics have been developed in various structures.
The piezoelectric body has a basic vibration mode according to three independent directions such as a polarization direction as a polar material, an electrode direction formed on both surfaces of the piezoelectric body, and a direction in which the piezoelectric body is deformed. The basic vibration mode of a piezoelectric body used in a piezoelectric generator is represented by the following three 31 mode, 33 mode, and 15 mode.
In the conventional piezoelectric generator, only the 31 mode or 33 mode is used. However, since the conventional piezoelectric generator is limited to improve the power generation when used only in one mode, the present invention intends to improve the power generation by providing a structure using 15 modes.
In addition, since the 15 mode has a much higher piezoelectric charge coefficient and piezoelectric coupling factor than the 31 mode or 33 mode, the structure using the 15 mode is more advantageous in terms of power generation.
It is an object of the present invention to improve a power generation amount of a power generation apparatus by providing a structure using a 15 mode which is not used in a conventional piezoelectric power generation apparatus. Particularly, in the present invention, the power generation amount of the power generation apparatus is further improved by using the 15 mode and the 33 mode together.
The piezoelectric power generation device of the present invention is advantageous in terms of power generation by using 15 modes as a piezoelectric power generation device applying 15 modes. On the other hand, the piezoelectric power generation apparatus of the present invention does not only include 15 modes, but it may include other modes as well.
A piezoelectric power generating apparatus according to an embodiment of the present invention includes: a first elastic member which is sequentially stacked on an upper surface of a structure; A piezoelectric element; And a second elastic member, wherein the piezoelectric element comprises: a piezoelectric body; A pair of first electrode patterns arranged to overlap with each other in the vertical direction so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body; And second electrode patterns arranged so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body in an overlapped manner in the vertical direction and arranged in an interdigitated manner with each of the first electrode patterns, Wherein the elastic member and the second elastic member have a long rod shape and one end is attached to the upper surface of the structure and the other end is not supported by the structure, and the first elastic member and the second elastic member The masses are attached to the ends of the first and second elastic members which are not supported by the structures of the first and second elastic members, The upper surface of the portion which is not supported by the at least one of the elastic member and the second elastic member An additional piezoelectric element is disposed on at least one of the lower surface and the lower surface of the piezoelectric element, and energy harvesting by the piezoelectric element is performed by using vibration energy of the structure and mass energy.
The additional piezoelectric element may include: a piezoelectric body; A pair of first electrode patterns arranged to overlap with each other in the vertical direction so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body; And second electrode patterns arranged in a vertically overlapping manner so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body and arranged in a manner of being interdigitated with each of the first electrode patterns.
The first electrode patterns and the second electrode patterns have different polarities of the first electrode pattern and the second electrode pattern disposed on the lower surface of the first electrode pattern and the second electrode pattern disposed on the upper surface.
And the ends which are not supported by the structures of the first elastic member and the second elastic member are respectively in the opposite directions from the structure.
A piezoelectric power generating apparatus according to an embodiment of the present invention includes: a first elastic member which is sequentially stacked on an upper surface of a structure; A piezoelectric element; And a second elastic member, wherein the piezoelectric element comprises: a piezoelectric body; A pair of first electrode patterns arranged to overlap with each other in the vertical direction so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body; Second electrode patterns arranged in an interdigitated manner so as to overlap with each other in the vertical direction so as to project in the same shape on the upper surface and the lower surface of the piezoelectric body; The first patterns and the second patterns are arranged so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body in the vertical direction, And third electrode patterns extending in zigzag form between the spaces of the second patterns, wherein the first elastic member and the second elastic member have a long rod shape and one end is attached to the upper surface of the structure And the other ends of the first elastic member and the second elastic member are disposed so as not to be supported by the structure, the ends of the first elastic member and the second elastic member which are not supported by the structure are different from each other, The mass and the mass are attached to the end of the member and the end of the second elastic member not supported by the structure Wherein an additional piezoelectric element is disposed on at least one of an upper surface and a lower surface of a portion which is not supported by any one of the first elastic member and the second elastic member and vibration caused by the vibration and mass of the structure And energy harvesting by the piezoelectric element is performed using energy.
The additional piezoelectric element may include: a piezoelectric body; A pair of first electrode patterns arranged to overlap with each other in the vertical direction so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body; And second electrode patterns arranged in a vertically overlapping manner so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body and arranged in a manner of being interdigitated with each of the first electrode patterns.
The first electrode patterns, the second electrode patterns, And the third electrode patterns have different polarities of the first electrode pattern, the second electrode pattern, and the third electrode pattern disposed on the lower surface of the first electrode pattern, the second electrode pattern, and the third electrode pattern disposed on the upper surface .
And the ends which are not supported by the structures of the first elastic member and the second elastic member are respectively in the opposite directions from the structure.
According to the present invention, it is possible to generate piezoelectric energy using the 15 mode, which has an advantage that the power generation amount of the power generation device is large.
In addition, there is an advantage that the power generation amount can be further increased by using the existing 33 modes together with the 15 mode.
1 shows a side view of a piezoelectric power generating apparatus according to an embodiment of the present invention.
2 is a schematic view of a piezoelectric element according to an embodiment of the present invention.
FIG. 3 is a schematic view of a piezoelectric element according to an embodiment of the present invention.
FIG. 4 is a schematic view of a piezoelectric element according to an embodiment of the present invention.
5 shows a direction of the shear stress when the piezoelectric element is driven in 15 mode according to an embodiment of the present invention.
Fig. 6 shows a schematic diagram at the time of poling of a piezoelectric element according to a further embodiment of the present invention.
Fig. 7 shows a schematic diagram of driving of a piezoelectric element according to a further embodiment of the present invention.
Fig. 8 shows the direction of shear stress when the piezoelectric element is driven in 15 mode according to a further embodiment of the present invention.
9 shows a side view of a piezoelectric power generating apparatus according to another embodiment of the present invention.
Various embodiments are now described with reference to the drawings, wherein like reference numerals are used throughout the drawings to refer to like elements. For purposes of explanation, various descriptions are set forth herein to provide an understanding of the present invention. It is evident, however, that such embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing the embodiments.
The following description provides a simplified description of one or more embodiments in order to provide a basic understanding of embodiments of the invention. This section is not a comprehensive overview of all possible embodiments and is not intended to identify key elements or to cover the scope of all embodiments of all elements. Its sole purpose is to present the concept of one or more embodiments in a simplified form as a prelude to the more detailed description that is presented later.
A piezoelectric power generating apparatus according to an embodiment of the present invention includes: a first elastic member which is sequentially stacked on an upper surface of a structure; A piezoelectric element; And a second elastic member, wherein the piezoelectric element comprises: a piezoelectric body; A pair of first electrode patterns arranged to overlap with each other in the vertical direction so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body; And second electrode patterns arranged so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body in an overlapped manner in the vertical direction and arranged in an interdigitated manner with each of the first electrode patterns, Wherein the elastic member and the second elastic member have a long rod shape and one end is attached to the upper surface of the structure and the other end is not supported by the structure, and the first elastic member and the second elastic member The masses are attached to the ends of the first and second elastic members which are not supported by the structures of the first and second elastic members, The upper surface of the portion which is not supported by the at least one of the elastic member and the second elastic member An additional piezoelectric element is disposed on at least one of the lower surface and the lower surface of the piezoelectric element, and energy harvesting by the piezoelectric element is performed by using vibration energy of the structure and mass energy.
In order to explain the piezoelectric power generating apparatus of the present invention, the following description will be sequentially given.
1 shows a side view of a piezoelectric power generating apparatus according to an embodiment of the present invention. 1, a piezoelectric power generating device according to an embodiment of the present invention includes: a first
The
The first
The first elastic member and the second elastic member may be any material having an elastic force. For example, a leaf spring or the like may be used.
In the case of the
In the present invention, in order to enable piezoelectric energy generation using the 15 mode, the direction of the tip of the first elastic member and the second elastic member located at the air hole, that is, the direction away from the structure, must be different from each other. Because the shear stress is applied to the upper and lower portions of the
The piezoelectric power generation device of the present invention is advantageous in terms of power generation by using 15 modes as a piezoelectric power generation device applying 15 modes. On the other hand, the piezoelectric power generation apparatus of the present invention does not only include 15 modes, but it may include other modes as well.
In this case, it is most preferable that the directions in which the first
The
FIG. 2 is a schematic view of a piezoelectric element according to an embodiment of the present invention, and includes a piezoelectric body PZ and
The piezoelectric body PZ is formed of a material having piezoelectricity, and is not particularly limited. Examples of the piezoelectric material include piezoelectric ceramics and ceramic / polymer composites.
The pair of
The pair of second electrode patterns 120 and 220 are arranged in an overlapping manner in the vertical direction so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body and arranged in an interdigited manner with each of the first electrode patterns 120 and 220 do.
The piezoelectric active region of the piezoelectric body PZ is a spacing region between the
The
The piezoelectric body PZ is interposed between the pair of
The
FIGS. 3 and 4 illustrate the poling and driving of the piezoelectric element according to an embodiment of the present invention.
3, when the poles are applied, voltages different from each other are applied to the
Next, when used as a power generation device after the polarization, the voltage polarity of the electrode pattern is not different between the first electrode pattern and the second electrode pattern, and the voltage characteristics of the electrode patterns disposed on the upper and lower surfaces of the piezoelectric element are different . That is, the polarities of the first electrode pattern and the second electrode pattern disposed on the lower surface of the first electrode pattern and the second electrode pattern disposed on the upper surface are different from each other.
5 shows a direction of the shear stress when the piezoelectric element is driven in 15 mode according to an embodiment of the present invention. As shown in FIG. 5, directions of forces applied to the upper surface and the lower surface of the piezoelectric element are opposite to each other, thereby applying shear stress. In this case, piezoelectric energy harvesting using the 15 mode becomes possible.
The additional piezoelectric element shown in Fig. 1 develops into 33 mode.
This additional piezoelectric element includes a piezoelectric body; A pair of first electrode patterns arranged to overlap with each other in the vertical direction so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body; And second electrode patterns arranged in a vertically overlapping manner so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body and arranged in a manner of being interdigitated with each of the first electrode patterns. These electrode patterns are the same as described above.
The first electrode patterns and the second electrode patterns have different voltage polarities and the first electrode patterns and the second electrode patterns disposed on the upper surface and the first electrode patterns and the second electrode patterns The polarity is different.
A piezoelectric power generating apparatus according to a further embodiment of the present invention includes: a first elastic member laminated on an upper surface of a structure in order; A piezoelectric element; And a second elastic member, wherein the piezoelectric element comprises: a piezoelectric body; A pair of first electrode patterns arranged to overlap with each other in the vertical direction so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body; Second electrode patterns arranged in an interdigitated manner so as to overlap with each other in the vertical direction so as to project in the same shape on the upper surface and the lower surface of the piezoelectric body; The first patterns and the second patterns are arranged so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body in the vertical direction, And third electrode patterns extending in zigzag form between the spaces of the second patterns, wherein the first elastic member and the second elastic member have a long rod shape and one end is attached to the upper surface of the structure And the other ends of the first elastic member and the second elastic member are disposed so as not to be supported by the structure, the ends of the first elastic member and the second elastic member which are not supported by the structure are different from each other, The mass and the mass are attached to the end of the member and the end of the second elastic member not supported by the structure Wherein an additional piezoelectric element is disposed on at least one of an upper surface and a lower surface of a portion which is not supported by any one of the first elastic member and the second elastic member and vibration caused by the vibration and mass of the structure And energy harvesting by the piezoelectric element is performed using energy.
The description overlapping with the contents described in the above embodiment will be omitted, and the following will describe the features newly added in the additional embodiments.
A piezoelectric power generating device according to a further embodiment of the present invention is shown in Fig.
The piezoelectric power generating device according to a further embodiment of the present invention is characterized in that the structure of the piezoelectric element disposed between the first elastic member and the second elastic member further arranges the electrode pattern to increase the electrical output value in the 15 mode, May have a structure, which is shown in Figs. 6-8.
Figs. 6 and 7 show a schematic diagram at the time of poling and a drive of the piezoelectric element according to a further embodiment of the present invention. Fig. 8 shows the direction of shear stress when the piezoelectric element is driven in 15 mode according to a further embodiment of the present invention.
6 and 7, a piezoelectric device according to a further embodiment of the present invention includes a piezoelectric body PZ; A pair of first electrode patterns arranged so as to overlap with each other in the vertical direction so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body; Second electrode patterns arranged so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body and arranged in an interdigitated manner with each of the first electrode patterns arranged in the vertical direction; And first and second patterns arranged in an overlapping relationship in the vertical direction so as to project in the same shape on the upper surface and the lower surface of the piezoelectric body, the first patterns and the second patterns arranged to interlock with the first patterns and the second patterns, And third electrode patterns extending in a zigzag pattern.
The piezoelectric device according to further embodiments of the present invention further includes a third electrode pattern in addition to the first and second electrode patterns. The third electrode pattern may include first and second patterns, Are arranged in a zigzag form between the spaces of the first patterns and the second patterns arranged in mesh with each other without being connected to each other.
Since the third electrode pattern is additionally disposed, it is possible to increase the electrical output value of the 15 mode when the piezoelectric energy harvesting occurs in the 15 mode.
In this case, at the time of polling, the first electrode pattern and the second electrode pattern are polled through different voltage polarities as shown in FIG. 6, and then the first electrode pattern disposed on the upper surface of the piezoelectric element, The polarities of the first electrode pattern, the second electrode pattern, and the third electrode pattern disposed on the lower surface of the two-electrode pattern and the third electrode pattern are different from each other.
Fig. 8 shows the direction of shear stress when the piezoelectric element is driven in 15 mode according to a further embodiment of the present invention. As shown in FIG. 8, the directions of the forces applied to the upper and lower surfaces of the piezoelectric element are opposite to each other, thereby applying shear stress. In this case, piezoelectric energy harvesting using the 15 mode becomes possible.
As shown in FIG. 9, in order to merge the 15 mode and the 33 mode, the piezoelectric power generating device according to the further embodiment of the present invention is characterized in that these elastic members are attached to at least one of the first elastic member and the second elastic member, An additional piezoelectric element is disposed on at least one of the upper surface and the lower surface of the portion where it is not formed.
This additional piezoelectric element includes a piezoelectric body; A pair of first electrode patterns arranged to overlap with each other in the vertical direction so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body; And second electrode patterns arranged in a vertically overlapping manner so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body and arranged in a manner of being interdigitated with each of the first electrode patterns. These electrode patterns are the same as described above.
The first electrode patterns and the second electrode patterns have different voltage polarities and the first electrode patterns and the second electrode patterns disposed on the upper surface and the first electrode patterns and the second electrode patterns The polarity is different.
9, a piezoelectric cantilever power generation apparatus using a complex mode in which 33 modes are combined into 15 modes can be realized.
The description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features presented herein.
Claims (8)
The piezoelectric element includes: a piezoelectric body; A pair of first electrode patterns arranged to overlap with each other in the vertical direction so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body; Second electrode patterns arranged in an interdigitated manner so as to overlap with each other in the vertical direction so as to project in the same shape on the upper surface and the lower surface of the piezoelectric body; The first patterns and the second patterns are arranged so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body in the vertical direction, And third electrode patterns extending in zigzag form between the spaces of the second patterns,
Wherein the first elastic member and the second elastic member have a long rod shape and one end is attached to the upper surface of the structure and the other end is not supported by the structure,
The ends of the first elastic member and the second elastic member, which are not supported by the structure, are different from each other in directions from the structure,
A mass is attached to an end of the first elastic member and the second elastic member not supported by the structure,
An additional piezoelectric element is disposed on at least one of an upper surface and a lower surface of a portion not supported by any one of the first elastic member and the second elastic member,
Wherein the energy-harvesting by the piezoelectric element is performed by using vibration energy of the structure and mass energy,
Piezoelectric power generating device.
The additional piezoelectric element may comprise:
A piezoelectric body;
A pair of first electrode patterns of an additional piezoelectric element arranged in a vertical direction so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body; And
The second electrode patterns of the additional piezoelectric elements arranged in a manner to overlap with the first electrode patterns of the additional piezoelectric element and arranged so as to be projected in the same shape on the upper surface and the lower surface of the piezoelectric body in the vertical direction, ,
Piezoelectric power generating device.
The first electrode patterns, the second electrode patterns, And the third electrode patterns have different polarities of the first electrode pattern, the second electrode pattern, and the third electrode pattern disposed on the lower surface of the first electrode pattern, the second electrode pattern, and the third electrode pattern disposed on the upper surface,
Piezoelectric power generating device.
Wherein the ends of the first elastic member and the second elastic member, which are not supported by the structure of the first elastic member and the second elastic member,
Piezoelectric power generating device.
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| KR1020150127370A KR101682961B1 (en) | 2015-09-09 | 2015-09-09 | Piezoelectric power generator |
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| KR1020150127370A KR101682961B1 (en) | 2015-09-09 | 2015-09-09 | Piezoelectric power generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20210007857A (en) * | 2019-07-09 | 2021-01-20 | 금오공과대학교 산학협력단 | Piezoelectric composite, method of manufacturing the same, and magnetoelectric laminate structure having the same |
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| JP2003525755A (en) * | 1999-10-29 | 2003-09-02 | アメリカ合衆国 | Piezoelectric macro-fiber composite actuator and method of manufacturing the same |
| JP2008211925A (en) * | 2007-02-27 | 2008-09-11 | Taiheiyo Cement Corp | Piezoelectric power generation device |
| KR20140050393A (en) * | 2012-10-19 | 2014-04-29 | 삼성전자주식회사 | Textile-based stretchable energy generator |
| KR101417848B1 (en) * | 2013-02-28 | 2014-07-09 | 한국세라믹기술원 | Vibration energy harvesting device having drum head structure |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003525755A (en) * | 1999-10-29 | 2003-09-02 | アメリカ合衆国 | Piezoelectric macro-fiber composite actuator and method of manufacturing the same |
| JP2008211925A (en) * | 2007-02-27 | 2008-09-11 | Taiheiyo Cement Corp | Piezoelectric power generation device |
| KR20140050393A (en) * | 2012-10-19 | 2014-04-29 | 삼성전자주식회사 | Textile-based stretchable energy generator |
| KR101417848B1 (en) * | 2013-02-28 | 2014-07-09 | 한국세라믹기술원 | Vibration energy harvesting device having drum head structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20210007857A (en) * | 2019-07-09 | 2021-01-20 | 금오공과대학교 산학협력단 | Piezoelectric composite, method of manufacturing the same, and magnetoelectric laminate structure having the same |
| KR102454903B1 (en) * | 2019-07-09 | 2022-10-17 | 금오공과대학교 산학협력단 | Piezoelectric composite, method of manufacturing the same, and magnetoelectric laminate structure having the same |
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