WO2010079857A1 - Unit for a piezoelectric generator and piezoelectric generator system comprising same - Google Patents

Abstract

The present invention relates to a unit for a piezoelectric generator and to a piezoelectric generator system comprising same. The unit for a piezoelectric generator comprises: a substrate being characteristically bent by the pressure or vibration applied to a surface thereof, and having a restoration force countering the bendable characteristic; a first piezoelectric layer which is formed on a first surface of the substrate, has a first area, and is formed once or multiple times; a second piezoelectric layer which is formed on a second surface of the substrate opposite the first surface, having a second area narrower than the first area, and formed such that a portion of the area thereof or the entirety of the area thereof can be overlapped with the first piezoelectric layer; and a circuit unit formed on the first piezoelectric layer which is not overlapped with the region in which the second piezoelectric layer is formed, such that a portion of the area thereof or the entirety of the area thereof can be overlapped with the first piezoelectric layer.

Description

Piezoelectric generator unit and piezoelectric generator system including the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric generator unit and a piezoelectric generator system including the same. The present invention relates to a generator system that produces electricity by bending a piezoelectric element by a pressure applied to a piezoelectric element and to a generator system combining the same. .

Piezoelectric materials have a variety of applications as transducers to convert mechanical energy into electrical energy. A large number of materials including inorganic and organic materials are known as materials causing piezoelectric phenomenon.

A piezoelectric body is a device which generates a voltage by the force applied to the piezoelectric body, and changes the amount of voltage generated according to the magnitude of the applied force.

In manufacturing a piezoelectric generator using such a piezoelectric material, it is important to effectively transmit external shock or vibration to the piezoelectric body without loss.

In addition, since the excessive shock may be transmitted to the piezoelectric body and the piezoelectric body may be broken, a structure capable of effectively transmitting external mechanical energy while preventing excessive shock is transmitted.

In particular, in the case of a ceramic piezoelectric body, brittleness is strong, and thus a housing capable of effectively transmitting mechanical energy and preventing breakage of the piezoelectric body from excessive external force is required.

On the other hand, in order to convert the mechanical energy transmitted from the outside into electrical energy by the piezoelectric material, it must be electrically connected to an external circuit through an electrode attached to or connected to the piezoelectric body.

However, when continuous vibration and shock are transmitted to the piezoelectric material used in the piezoelectric generator, the electrical connection between the piezoelectric body and the electrode is broken. Therefore, a power generation unit or a system for maintaining an electrical connection to the piezoelectric element should be developed in spite of such vibrations and shocks, but there are no clear achievements.

SUMMARY OF THE INVENTION The present invention has been made in view of the above necessity. In constructing a piezoelectric generator system for converting mechanical energy into electrical energy, a piezoelectric layer is provided on the front and rear surfaces of a substrate having elastic force, and an integrated circuit portion is formed on the piezoelectric layer. The piezoelectric generator unit has a structure that can effectively transmit external vibration and shock while preventing the piezoelectric body from being damaged due to excessive impact and maintaining electrical connection between the external circuit and the piezoelectric body. Its purpose is to provide.

The piezoelectric generator unit according to the first embodiment of the present invention is a substrate having a characteristic that is bent by pressure or vibration applied to the surface and the restoring force against the warp, and the first provided on the first surface of the substrate in a rectangular shape 1 piezoelectric layer, a circuit portion provided on one side of the first piezoelectric layer, and the first two piezoelectric layers including the circuit portion are arranged in a set, wherein each of the circuit portions has a rectangular shape so as to face in opposite directions to each other. The first piezoelectric part arranged to face each other and the second surface of the substrate to be the opposite surface of the first surface, provided in a rectangular shape overlapping with the rest of the region except for the circuit portion of the first piezoelectric portion And a second piezoelectric layer.

Here, the substrate is characterized in that the metal or plastic material is used, wherein the first piezoelectric layer or the second piezoelectric layer is Pb (Zr, Ti) O ₃ + Pb (Zn, Nb) O ₃ , Pb (Zr, Ti) O ₃ + Pb (Ni, Nb) O ₃ , Pb (Zr, Ti) O ₃ + PVDF polymer, Pb (Zr, Ti) O ₃ + silicon polymer and Pb (Zr, Ti) O ₃ + epoxy polymer It is characterized by being formed of a material composed of at least any one of.

In addition, the piezoelectric generator unit according to the second embodiment of the present invention is provided with a substrate having a characteristic that is bent by pressure or vibration applied to the surface and the restoring force against the warp, and a rectangular shape on the first surface of the substrate A first piezoelectric layer, a circuit portion provided on both sides of the first piezoelectric layer in a longitudinal direction of the first piezoelectric layer, and a second surface of the substrate, which is opposite to the first surface, wherein the first piezoelectric layer is It includes a second piezoelectric layer provided in a rectangular form overlapping with the rest of the region other than the circuit portion region.

In addition, the piezoelectric generator unit according to the third embodiment of the present invention is provided with a substrate having a characteristic of bending due to pressure or vibration applied to a surface and restoring force against the warp, and a rectangular shape on the first surface of the substrate. A first piezoelectric layer, a circuit portion provided on one side of the first piezoelectric layer, and a second surface of the substrate serving as an opposite surface of the first surface, except for the circuit portion region of the first piezoelectric layer. It includes a second piezoelectric layer provided in a rectangular form overlapping the remaining area.

In addition, the piezoelectric generator unit according to the fourth embodiment of the present invention has a substrate having a characteristic of bending due to pressure or vibration applied to a surface and a restoring force against the warp, and a first area on the first surface of the substrate. The first piezoelectric layer, which is formed in a singular or plural number, is formed to have a second area narrower than the first area on the second surface of the substrate, which is the opposite surface of the first surface, and partially with the first piezoelectric layer. Or a second piezoelectric layer formed to overlap the entire region, and a circuit portion formed to overlap a portion or the entire region on the first piezoelectric layer which does not overlap with the region where the second piezoelectric layer is formed.

In addition, the piezoelectric generator system of the present invention is a substrate having a characteristic that is bent by the pressure or vibration applied to the surface and the restoring force against the warp, and the first surface of the substrate having a first area having a single or plural number And a first piezoelectric layer and a second area narrower than the first area on the second surface of the substrate, which is the opposite surface of the first surface, and overlaps the first piezoelectric layer with some or all of the area. A unit for a piezoelectric generator including a second piezoelectric layer and a circuit portion formed to overlap a portion or the entire region on the first piezoelectric layer that does not overlap with the region where the second piezoelectric layer is formed as one unit unit, At least two or more unit units are arranged on the substrate so as to be spaced apart from each other, and circuit units provided in each unit unit Is connected is provided to accumulate voltage.

Here, the substrate region adjacent to both ends of the unit unit is a moving portion, the substrate region adjacent to the central portion of the unit unit is a fixed portion, is provided on the upper portion of the substrate, the movement portion in accordance with the moving load And a lower plate including a upper plate including a pressure pin for transmitting pressure to the lower plate and a lower plate including a support pin for supporting a fixing portion of the substrate. Is characterized in that it is provided with two or more stacked in a vertical structure.

In addition, the piezoelectric generator unit according to another embodiment of the present invention is a bar-type substrate and a bar-type substrate having a characteristic that is bent by pressure or vibration applied to a surface and its restoring force against warpage A piezoelectric layer formed on the first surface in a singular or plural number and a neck portion provided to reduce the width of the bar substrate in a portion adjacent to the piezoelectric layer to smoothly vibrate each piezoelectric layer. neck) and a circuit portion formed on a second surface of the bar-shaped substrate, which is opposite to the first surface, and provided in an area not overlapping with the piezoelectric layer and connecting the circuit portion to the piezoelectric layer. An electrode.

Here, the piezoelectric layer is formed in a circular shape, the neck (neck) is formed in pairs on both side walls of the bar-shaped substrate so as to be symmetrical based on the piezoelectric layer, the piezoelectric 1 to 3 pairs are formed per layer.

In addition, the present invention includes a piezoelectric generator system in which at least two unit units are stacked in a vertical structure when the piezoelectric generator unit is a unit unit.

The present invention improves the structure of the piezoelectric generator unit as described through the above embodiment, while effectively transmitting external vibration and shock to the piezoelectric body, while preventing excessive damage from being transmitted to the piezoelectric body, and at the same time prevents the By maintaining the electrical connection, the durability of the piezoelectric generator system can be improved, and the effect of improving the power generation efficiency is provided.

In addition, the piezoelectric generator system according to the present invention has a relatively simple internal structure and is easy to manufacture, and can be freely adjusted in size according to the situation, and its application range is wide. In addition, since it can be simply buried in the form of a box can be utilized as a generator for the road, it provides an effect that can reduce the installation cost.

1 is a plan view showing a piezoelectric generator unit according to a first embodiment of the present invention.

2 is a plan view showing a piezoelectric generator system according to a first embodiment of the present invention.

3 is a plan view showing a piezoelectric generator unit according to a second embodiment of the present invention.

4 is a plan view showing a piezoelectric generator system according to a second embodiment of the present invention.

5 is a plan view showing a piezoelectric generator unit according to a third embodiment of the present invention.

6 is a plan view showing a piezoelectric generator system according to a third embodiment of the present invention.

7 is a sectional view showing a piezoelectric generator system according to the present invention.

8 and 9 are a plan view and a rear view showing a piezoelectric generator unit according to a fourth embodiment of the present invention.

10 is a cross-sectional view showing a piezoelectric generator system according to a fourth embodiment of the present invention.

The piezoelectric generator unit according to the present invention includes a substrate having a characteristic that is bent by pressure or vibration applied to a surface and a restoring force against the warp, and a first or a plurality of substrates having a first area on a first surface of the substrate. The second piezoelectric layer formed to have a second area narrower than the first area on the piezoelectric layer and the second surface of the substrate, which is the opposite surface of the first surface, and formed to overlap the first piezoelectric layer with some or all of the region. And a circuit part formed to overlap part or all of the area on the first piezoelectric layer which does not overlap with the area where the second piezoelectric layer is formed.

1 is a plan view showing a piezoelectric generator unit according to a first embodiment of the present invention.

Referring to FIG. 1, first, a substrate having a bending property by pressure or vibration applied to a surface and a restoring force against the bending thereof is provided. At this time, it is preferable to use a substrate provided with a metal or plastic material. In addition, in order to explain the positional relationship between the piezoelectric layers, illustration of the substrate is omitted, and the base surface of the drawing may be the substrate. Details of this can be seen in FIG. 2.

Next, first piezoelectric layers 100 and 120 provided in a rectangular shape on the first surface of the substrate are provided. In this case, the first embodiment according to the present invention shows a case in which two first piezoelectric layers 100 and 120 are provided in one set.

Next, circuit portions 140 and 150 are provided on one side of the two first piezoelectric layers 100 and 120, respectively, and the circuit portions 140 and 150 are arranged to face in opposite directions.

Next, the second piezoelectric layer 130 is provided on the second surface of the substrate, which is the surface opposite to the first surface. In this case, the second piezoelectric layer 130 may be provided in a rectangular shape overlapping with the remaining areas except for the circuit parts 140 and 150 in the first piezoelectric layers 100 and 120. At this time, the size of each piezoelectric layer or the degree of overlap with each other may be applied differently according to the scale of each piezoelectric system, so the scope of protection of the present invention is not limited thereto.

Here, the first piezoelectric layers 100 and 120 or the second piezoelectric layer 130 may include Pb (Zr, Ti) O ₃ + Pb (Zn, Nb) O ₃ , Pb (Zr, Ti) O ₃ + Pb (Ni, Nb ) O ₃ , Pb (Zr, Ti) O ₃ + PVDF polymer, Pb (Zr, Ti) O ₃ + silicon polymer and Pb (Zr, Ti) O ₃ + epoxy polymer It is preferable.

In order to generate the piezoelectric generator unit configured as described above, pressure must be applied to the first piezoelectric layers 100 and 120 or the second piezoelectric layer 130. At this time, it is possible to maximize the bending characteristic is to press both edge portions of the first piezoelectric layer (100, 120) formed circuit portion (140, 150). In addition, it is preferable to fix the center region of the second piezoelectric layer 130 so that the warpage characteristics of the first piezoelectric layers 100 and 120 and the second piezoelectric layer 130 may further appear.

By using the first piezoelectric generator unit formed as described above, it is possible to manufacture the following first piezoelectric generator system.

2 is a plan view showing a piezoelectric generator system according to a first embodiment of the present invention.

Referring to FIG. 2, first piezoelectric layers 100 and 120 and second piezoelectric layers 130 are formed on both surfaces (front and rear surfaces) with the substrate 160 interposed therebetween.

Next, the circuit units 140 and 150 are formed on the first piezoelectric layers 100 and 120 to complete the piezoelectric generator unit.

Then, the piezoelectric generator units are arranged in a matrix form, and the circuit portions of each unit are connected to each other so as to accumulate generated electricity. In this case, the fixing unit 180 is formed on the substrate adjacent to the center of the piezoelectric generator unit, and the moving unit 170 is formed on the substrate adjacent to both edges of the unit. The fixing unit 180 may be supported at the bottom of the substrate, and the movement unit 170 may be formed in a structure in which the substrate may be bent by a pressure pin.

The piezoelectric generator system formed as described above has a structure in which a plurality of piezoelectric generator units operate in accordance with a pressure applied to one region, thereby increasing power generation effects. In addition, since the units are uniformly distributed on the substrate, it is possible to effectively cope with the moving load across the substrate. In addition, since the piezoelectric layers are managed separately by the substrate rather than individually managed, it is possible to prevent the piezoelectric layers from being damaged by excessive impact.

3 is a plan view showing a piezoelectric generator unit according to a second embodiment of the present invention, Figure 4 is a plan view showing a piezoelectric generator system according to a second embodiment of the present invention.

3 and 4, the first piezoelectric layer 200 is provided in a rectangular shape on an upper surface of the first surface of the substrate 260, and a circuit portion is disposed on both sides of the first piezoelectric layer 200 in the longitudinal direction of the first piezoelectric layer 200. 240, 250).

Next, on the second surface of the substrate 260, which is the opposite surface of the first surface, a second piezoelectric element provided in a rectangular shape overlapping with the remaining regions of the first piezoelectric layer 200 except for the circuit portions 240 and 250. The layer 230 is formed to complete the second piezoelectric generator unit according to the second embodiment of the present invention.

Next, after arranging the second piezoelectric generator units in a matrix form, a moving part 270 is installed on the substrate 260 in the area adjacent to the circuit parts 240 and 250, and the area of the area adjacent to the center part of each unit. The fixing part 280 is installed below the substrate 260 to complete the second piezoelectric generator system according to the second embodiment of the present invention.

5 is a plan view showing a piezoelectric generator unit according to a third embodiment of the present invention, Figure 6 is a plan view showing a piezoelectric generator system according to a third embodiment of the present invention.

Referring to FIGS. 5 and 6, the first piezoelectric layer 300 is provided in a rectangular shape on the first surface of the substrate 360, and the circuit unit is disposed on one side of the first piezoelectric layer 300 in the longitudinal direction. 340 is provided.

Next, a second piezoelectric layer provided on a second surface of the substrate 360, which is the opposite surface of the first surface, in a rectangular shape overlapping with the rest of the first piezoelectric layer 300 except for the circuit portion 340. 330 is formed to complete the third piezoelectric generator unit according to the third embodiment of the present invention.

Next, after arranging the units for the third piezoelectric generator in a matrix form, the moving unit 370 is installed on the substrate 360 in the region adjacent to the circuit unit 340, and the substrate in the region adjacent to the center of each unit ( 360, a fixing part 380 is installed at the lower part to complete the third piezoelectric generator system according to the third embodiment of the present invention.

7 is a cross-sectional view showing a piezoelectric generator system according to the present invention.

Referring to FIG. 7, each of the substrates representing at least one selected from the first to third piezoelectric generator systems described above is provided with four layers of stacked structures 460a, 460b, 460c, and 460d, and the uppermost substrate 460a. In the upper portion of the upper plate 490 including a pressure pin 470 for transmitting pressure to the above-described moving part in accordance with the moving load.

Next, a lower plate 495 including support pins 480 supporting the fixing portion of the substrate is provided under the lowermost substrate 460d. At this time, the upper plate 490 and the lower plate 495 serves to protect each substrate.

8 and 9 are a plan view and a rear view showing a piezoelectric generator unit according to a fourth embodiment of the present invention.

FIG. 8 is a view of the piezoelectric generator unit viewed from above, and includes a bar substrate 560 having a bending property due to pressure or vibration applied to a surface and a restoring force against bending.

Next, a circular piezoelectric layer 530 is formed on the front surface of the bar substrate 560. At this time, the piezoelectric layer 530 is not necessarily limited to a circular shape, and may be formed in a singular or plural number.

Here, a neck is provided to reduce the width of the bar substrate 560 adjacent to the piezoelectric layer 530 so that vibration of each piezoelectric layer 530 is smoothly performed. The neck is formed in such a manner that some surfaces of the bar substrate 560 are removed to be symmetrical on both sides of the piezoelectric layer 530, and one piezoelectric layer 530 is formed. It is preferable that 1-3 pairs are formed with respect to.

Next, referring to FIG. 9, the circuit unit 540 is formed in a region not overlapping with the piezoelectric layer 530 on the rear surface of the bar substrate 560, which is an opposite surface to the surface on which the piezoelectric layer 530 is formed. It is provided.

Next, an electrode 535 connecting the piezoelectric layer 530 and the circuit unit 540 is provided. In this case, the electrode 535 is provided in the form of crossing the bar-type substrate 560, but is not necessarily limited thereto.

The piezoelectric generator unit provided as described above is provided with a fixing part 580 in an area between the piezoelectric layers 530 so that the vibration can be concentrated only on the piezoelectric layer 530. In addition, the circuit unit 540 is preferably formed in a region that does not overlap with the piezoelectric layer 530 in order to prevent damage by the vibration of the piezoelectric layer 530.

The piezoelectric generator unit as described above may build a piezoelectric generator system by stacking two or more sheets in a vertical structure as in the above-described embodiments.

10 is a cross-sectional view showing a piezoelectric generator system according to a fourth embodiment of the present invention.

Referring to FIG. 10, the first to fourth piezoelectric generator units 560a, 560b, 560c, and 560d having the same shape as those of FIGS. 8 and 9 are arranged in a vertical structure, and the fixing parts 580 are connected to each other. Each of the first to fourth piezoelectric layers 530a, 530b, 530c, and 530d may be equally vibrated by the vibration. In this case, a pressure pin 570 may be further provided between the piezoelectric layers so that the pressure applied from the upper portion may be effectively transmitted to the final fourth piezoelectric layer 530d.

Next, power generated through the first to fourth piezoelectric layers 530a, 530b, 530c, and 530d may be collected from the first to fourth circuit units 540a, 540b, 540c, and 540d to supply power to various electric devices. Make sure

By implementing the stacked piezoelectric generator system, it is possible to maximize the piezoelectric efficiency.

As described above, the piezoelectric generator unit and the piezoelectric generator system according to the present invention can effectively transmit external vibration and shock to the piezoelectric layer and at the same time maintain electrical connection of the circuit part stably, thereby improving durability of the piezoelectric generator system. Can be. In addition, it is possible to freely improve the power generation efficiency according to the area or lamination of the substrate, and because the structure is relatively simple, it can be manufactured in various sizes and utilized in various fields. For example, it can be used for a road generator using a moving load, and by using this, it is possible to build a system for supplying power such as traffic lights, safety lights, and sensors used in the road.

Claims (14)

A substrate having a bending property by pressure or vibration applied to a surface and a restoring force against the bending; A first piezoelectric layer provided in a rectangular shape on the first surface of the substrate; A circuit unit provided on an upper portion of one side of the first piezoelectric layer; A first piezoelectric part arranged in a set of two first piezoelectric layers including the circuit part, each of the circuit parts facing each other so as to face in opposite directions; And A piezoelectric generator including a second piezoelectric layer provided on a second surface of the substrate, which is opposite to the first surface, and provided in a rectangular shape overlapping with the remaining regions except for the respective circuit portion regions of the first piezoelectric portion. Unit. The method of claim 1, The substrate is a piezoelectric generator unit, characterized in that used is provided with a metal or plastic material. The method of claim 1, The first piezoelectric layer or the second piezoelectric layer may include Pb (Zr, Ti) O ₃ + Pb (Zn, Nb) O ₃ , Pb (Zr, Ti) O ₃ + Pb (Ni, Nb) O ₃ , Pb (Zr, A piezoelectric generator unit formed of a material consisting of at least one of Ti) O ₃ + PVDF polymer, Pb (Zr, Ti) O ₃ + silicon polymer, and Pb (Zr, Ti) O ₃ + epoxy polymer. . A substrate having a bending property by pressure or vibration applied to a surface and a restoring force against the bending; A first piezoelectric layer provided in a rectangular shape on the first surface of the substrate; A circuit unit provided on both sides of the first piezoelectric layer in the longitudinal direction; And The piezoelectric generator for a piezoelectric generator comprising a second piezoelectric layer provided on the second surface of the substrate that is opposite to the first surface, and provided in a rectangular form overlapping with the remaining regions other than the circuit portion region of the first piezoelectric layer. Unit. A substrate having a bending property by pressure or vibration applied to a surface and a restoring force against the bending; A first piezoelectric layer provided in a rectangular shape on the first surface of the substrate; A circuit unit provided on an upper portion of one side of the first piezoelectric layer; And The piezoelectric generator for a piezoelectric generator comprising a second piezoelectric layer provided on the second surface of the substrate that is opposite to the first surface, and provided in a rectangular form overlapping with the remaining regions other than the circuit portion region of the first piezoelectric layer. Unit. A substrate having a bending property by pressure or vibration applied to a surface and a restoring force against the bending; A first piezoelectric layer having a first area on the first surface of the substrate and having a single or plural number; A second piezoelectric layer formed to have a second area narrower than the first area on the second surface of the substrate, which is the opposite surface of the first surface, and overlapping the first piezoelectric layer with a part or the whole area. ; And And a circuit part formed to overlap part or all of the area on the first piezoelectric layer which does not overlap with the area where the second piezoelectric layer is formed. A substrate having characteristics that are bent by pressure or vibration applied to the surface and restoring force against the warp, a first piezoelectric layer having a first area on the first surface of the substrate, and having a single area or a plurality thereof, and the first surface The second piezoelectric layer and the second formed on the second surface of the substrate, which is the opposite surface of the substrate, to have a second area narrower than the first area, and the first piezoelectric layer and some or all regions overlap. A unit for a piezoelectric generator including a circuit unit formed to overlap a portion or the entire region on the first piezoelectric layer that does not overlap with the region where the piezoelectric layer is formed as one unit unit, At least two or more unit units are arranged on the substrate so as to be spaced apart from each other, and the circuit units provided in each unit unit are connected to each other to accumulate voltage. The method of claim 7, wherein And the substrate region adjacent to both ends of the unit unit is a moving portion, and the substrate region adjacent to the central portion of the unit unit is a fixed portion. The method of claim 8, An upper plate provided at an upper portion of the substrate and including a pressure pin configured to transfer pressure to the moving part according to a moving load; And The piezoelectric generator system, characterized in that it comprises a lower plate provided on the lower portion of the substrate, including a support pin for supporting the fixing portion of the substrate. The method of claim 7, wherein The substrate including the unit unit is a piezoelectric generator system, characterized in that provided with two or more stacked in a vertical structure. A bar-type substrate having a bending property by pressure or vibration applied to a surface and a restoring force against the bending; A piezoelectric layer formed on the first surface of the bar substrate in singular or plural; A neck provided in a form of reducing the width of the bar-shaped substrate adjacent to the piezoelectric layer to smoothly vibrate each piezoelectric layer; A circuit portion formed on a second surface of the bar substrate, which is opposite to the first surface, and provided in an area not overlapping with the piezoelectric layer; And Piezoelectric generator unit including an electrode for connecting the circuit portion to the piezoelectric layer. The method of claim 11, The piezoelectric layer is a piezoelectric generator unit, characterized in that formed in a circular shape. The method of claim 11, The neck is formed in pairs on both side walls of the bar-type substrate so as to be symmetrical with respect to the piezoelectric layer, and 1 to 3 pairs are formed for each one of the piezoelectric layers. Piezoelectric generator unit. 12. The piezoelectric generator system according to claim 11, wherein when the piezoelectric generator unit is one unit unit, two or more unit units are stacked in a vertical structure.

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