KR101020533B1 - Piezoelectric power generator using multi mode - Google Patents

Abstract

PURPOSE: A piezoelectric generator using a multiple mode is provided to improve generation quantity by generating electricity through a footboard and a piezoelectric element. CONSTITUTION: An external force is directly applied to a footboard(110). An upper plate(116) is connected to the footboard with a first elastic member(118). A lower plate(112) is connected to the upper plate with a piezoelectric element(114). The piezoelectric element is adhered between the upper plate and the lower plate. The first elastic member connects the footboard to the upper plate. A second elastic member(120) connected to the outer wall of the lower plate to the outer side of the upper plate. The first and second elastic members are made of springs with constant elasticity. A fixing member fixes the footboard to the upper plate when the first elastic member is compressed.

Description

Piezoelectric Generator Using Multi-Mode {PIEZOELECTRIC POWER GENERATOR USING MULTI MODE}

The present invention relates to a piezoelectric generator, and more particularly, to a piezoelectric generator using multiple modes. More specifically, the present invention relates to a piezoelectric generator using a multi-mode that can recover the energy discarded due to human walking and improve the amount of power generated.

Thanks to the development of information and communication technology, mobile communication devices or portable terminals are widely used. Most of these devices are configured to draw power from batteries or rechargeable batteries. In this case, when using the rechargeable battery as a power supply means is required to charge the rechargeable battery, there is no difficulty in charging the rechargeable battery if the power line is close, but there is a problem that can not charge the rechargeable battery in places such as mountains or remote areas.

In order to solve this problem, a generator capable of charging a rechargeable battery without a separate power line has been proposed in various structures. Representative methods of generating electricity without using a separate power include a method using a piezoelectric body and a method using a magnet and a coil. Since a method using a magnet and a coil requires an external force, i.e., an external force, to rotate the magnet or the coil, in recent years, the development of a generator that generates electricity using a piezoelectric material, which requires relatively little external force, is gradually being activated.

In general, when a force is applied to a piezoelectric body in a specific direction from the outside, positive (+) charges are induced on the first electrode of the piezoelectric body and negative (-) charges are induced on the second electrode of the piezoelectric body in response to the stress generated inside. Voltage is generated between the two electrodes, which is called the piezoelectric effect. On the contrary, when a voltage is applied to the piezoelectric body from the outside, the piezoelectric body causes mechanical distortion, which is called a piezoelectric adverse effect. In other words, the piezoelectric material converts a mechanical force (stress) into an electrical signal (voltage) or a mechanical signal into a mechanical force. As a material having such a property, piezoelectric ceramics using ceramics as a material This is the most used. Generators that generate electricity using such piezoelectric ceramics have been developed in various structures.

The piezoelectric material has a basic vibration mode in three independent directions, such as a polarization direction, an electrode direction formed on both surfaces of the piezoelectric body, and a direction in which the piezoelectric material is deformed. There are three basic vibration modes of piezoelectric materials used in piezoelectric generators: '31 mode ', '33 mode' and '15 mode '. Here, the front number represents the electrical direction and the back number represents the mechanical displacement direction.

FIG. 1 is a diagram for describing the '31 mode ', FIG. 2 is a diagram for explaining the '33 mode', and FIG. 3 is a diagram for explaining the '15 mode '.

1 to 3, assuming that the electrodes of the piezoelectric body are disposed above and below, in the '31 mode ', the electric field direction and the displacement direction are formed in the vertical direction. In the '33 mode ', the electric field direction and the displacement direction are formed in the same horizontal direction. In '15 mode ', the shear direction (sliding) is perpendicular to the electric field direction but the polarization direction is parallel to the displacement direction.

4 is a diagram illustrating an example of a piezoelectric generator according to the prior art.

Referring to FIG. 4, the piezoelectric generator according to the related art includes a scaffold 10, a lower plate 12, a piezoelectric body 14, and an elastic member 16. The piezoelectric generator mainly uses only '31 mode 'or '33 mode' among the three basic vibration modes described above. That is, as shown in FIG. 4, only the pressing force is transmitted to the piezoelectric body 14 through the scaffold 10 to generate power.

However, since the piezoelectric generator according to the prior art generates power using only one vibration mode such as '31 mode 'or '33 mode', there is a limit to improving the amount of power generation.

Therefore, the present invention has been proposed to solve the problems according to the prior art, and has the following objects.

First, an object of the present invention is to provide a piezoelectric generator using multiple modes.

In addition, the present invention has another object to provide a piezoelectric generator that can improve the amount of power generated.

In addition, the present invention is another object to provide a piezoelectric generator that can recover the energy discarded due to human walking to implement two basic vibration modes, thereby improving the amount of power generated.

According to an aspect of the present invention, there is provided a scaffold, a top plate, a bottom plate, a piezoelectric material bonded between the top plate and the bottom plate, a first elastic member connecting the foot plate and the top plate, and It provides a piezoelectric generator having a second elastic member connecting the outer wall of the lower plate and the outer portion of the upper plate.

In addition, the present invention may be provided on the outer side of the scaffold, when the pressure is applied to the scaffold from the top downward may further comprise a fixing member for fixing the scaffold to the top plate when the first elastic member is compressed.

The piezoelectric body may generate power in 15 modes after power generation in 31 modes.

In addition, the present invention according to another aspect for achieving the above object is a foot plate, the upper plate, the lower plate, the piezoelectric bonded between the upper plate and the lower plate, and the first elastic member for connecting the foot plate and the upper plate and A second elastic member connecting the outer wall of the lower plate and the outer part of the upper plate, an impact member fixed to one side of the shaft provided on both sides of the scaffold and pendulum-moving to the shaft, and installed on an upper surface of the upper plate. A third elastic member that is compressed by the first elastic member, and a third elastic member connected between the crimping member and the impact member to attract the impact member so that the impact member impacts the piezoelectric body when the crimping member is crimped; It can provide a piezoelectric generator having a.

In addition, the present invention may be provided on the outer side of the scaffold, when the pressure is applied to the scaffold from the top downward may further comprise a fixing member for fixing the scaffold to the top plate when the first elastic member is compressed.

The impact member may include a handle portion fixed to the shaft, and a head portion installed at an end of the handle portion to impact the piezoelectric body.

The third elastic member may be connected to the handle portion.

The pressing member may be a thin metal plate.

The scaffold and the top plate may be provided with a space in the path that the impact member pendulum movement.

The scaffold and the top plate may have an 'H' shape.

It may be further provided with a fixing member which is installed on both sides of the scaffold to fix the impact member.

The fixing member may be a magnet.

An upper portion of the upper plate may be provided with an accommodating portion for accommodating the first elastic member.

The piezoelectric body may generate power in 15 modes after power generation in 33 modes.

According to the present invention, by changing the structure of the piezoelectric generator to implement two vibration modes, for example '31 mode 'and '15 mode', or '33 mode 'and '15 mode' together piezoelectric according to the prior art As with the generator, it is possible to improve the power generation in the basic vibration mode.

The present invention is intended to be applied to the sidewalk block, etc. in consideration of the human walking state and the details are as follows.

If we look at the movement to move forward, we first step forward and pull the step back toward you. To step forward is to apply force downward, perpendicular to the ground, and to pull the stepping foot toward yourself is to apply force in your direction, horizontal to the ground. Accordingly, the present invention is to provide a piezoelectric generator applying two vibration modes by applying this operation.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention. In addition, the parts denoted by the same reference numerals (or reference numerals) throughout the specification represent the same elements.

Example 1

5 is a front sectional view illustrating the piezoelectric generator according to the first embodiment of the present invention.

Referring to FIG. 5, the piezoelectric generator according to the first exemplary embodiment of the present invention includes a scaffold 110, an upper plate 116, a lower plate 112, a piezoelectric body 114, and first and second elastic members 118. 120).

The scaffold 110 is a member to which external pressure, that is, external force is directly applied. The upper plate 116 is installed under the foot plate 110 and is connected to the foot plate 110 by the first elastic member 118. The lower plate 112 is installed below the upper plate 116 and is connected to the upper plate 116 by the piezoelectric body 114.

The scaffold 110 may have the same shape (structure) as the top plate 116. At least one fixing member 110a may be installed at both sides of the scaffold 110, that is, at both end portions thereof. The fixing member 110a may be integrally formed with the scaffold 110 in the form of an outer wall, or may be fastened through the fastening member, and the first elastic member 118 is compressed by applying pressure to the scaffold 110 downward from the outside. When it is worn down along the outer wall of the upper plate 116 down.

 The piezoelectric body 114 is disposed between the upper plate 116 and the lower plate 112. Preferably, the piezoelectric body 114 has an upper surface adhered to a lower surface of the upper plate 116, and a lower surface adhered to an upper surface of the lower plate 112. The piezoelectric material 114 is a PZT (piezoelectrics) material which is most commonly used as a device in which polarization is induced inside a material when an external mechanical pressure is applied.

The lower plate 112 has an outer wall 112a installed to surround the upper plate 116 and the foot plate 110. The outer wall 112a is preferably formed integrally with the lower plate 112, but may be manufactured as a separate member and fastened and fixed with the lower plate 112 to be integrated. The outer wall 112a is connected to the outer side of the upper plate 116 by the second elastic member 120, respectively. That is, one side of the second elastic member 120 is fastened and fixed to the outer wall 112a, and the other side is fastened and fastened to the outer side of the upper plate 116.

The first and second elastic members 118 and 120 may be formed of springs having a predetermined elastic force.

 6 and 7 illustrate driving characteristics of the piezoelectric generator according to the first embodiment of the present invention.

Referring to FIG. 6, when an external force is applied to the scaffold 110 from the top to the bottom as shown by the arrow direction (vertical direction in the drawing), the scaffold 110 moves in the vertical direction to move the first elastic member 118 in the vertical direction. Pressurize The pressure applied to the first elastic member 118 is transmitted to the upper plate 116 again to pressurize the piezoelectric body 114. At this time, since the pressure is applied to the piezoelectric body 114 in a direction perpendicular to the polarization direction of the piezoelectric body 114, the piezoelectric body 114 develops in the '31 mode '.

Referring to FIG. 7, when the scaffold 110 is pressed by an external force and the external force is applied in a direction horizontal to the ground (arrow direction in the drawing), the scaffold 110 is pulled in the right direction (arrow direction in the drawing). The upper plate 116 is also moved in the right direction by the fixing member 110a of the 110. At this time, since the lower plate 112 is fixed, the piezoelectric body 114 is deformed in the same shape as in the same plane. This leads to development in '15 mode '.

When the piezoelectric power is generated in the '15 mode 'using the piezoelectric body 114, the piezoelectric body 114 may be destroyed by an external force. In order to prevent this, a distance of several mm may be actually moved in the right direction by the external force. It is preferable to limit to the following. The actual travel distance is not distorted enough to be apparent as shown in FIG.

After the power generation of the piezoelectric generator is completed, if all external forces are removed, the components of the piezoelectric generator are returned to their original states by the elastic forces of the first and second elastic members 118 and 120.

Example 2

8 is a plan view showing a piezoelectric generator according to a second embodiment of the present invention, Figure 9 is a front sectional view.

8 and 9, the piezoelectric generator according to the second embodiment of the present invention includes a scaffold 210, an upper plate 216, a lower plate 212, a piezoelectric body 214, and a first elastic member 218. ), A second elastic member 220, a third elastic member 230, an impact member 224, and a crimping member 228.

Scaffold 210, top plate 216, bottom plate 212, piezoelectric body 214, first and second elastic members 218, 220 are similar to the piezoelectric generator according to Embodiment 1 of the present invention shown in FIG. Since it has a structure, a detailed description thereof will be replaced with the contents described in the first embodiment.

Scaffold 210 has a 'H' shape as shown in FIG. This is to provide a space in which the impact member 224 pendulum moves to the shaft 222 installed on both sides of the footrest 210.

The impact member 224 impacts the piezoelectric body 214 by pendulum movement with respect to the shaft 222. The impact member 224 may include a handle part coupled to the shaft 222 and a head part installed at an end of the handle part to impact the piezoelectric body 214. A third elastic member 230 is connected to the handle part, and pendulum movement is performed according to the movement of the third elastic member 230.

Since the impact member 224 reaches the piezoelectric member 214 through the upper plate 216, the pendulum movement path of the impact member 224 reaches the upper plate 216 as well as the foot plate 210. Accordingly, the top plate 216 should be provided with a space in which the impact member 224 pendulum like the foot plate 210. To this end, the top plate 216 may have the same shape as the foot plate 210. For example, the top plate 216 may be symmetrically disposed with the foot plate 210 and may have an 'H' shape.

The third elastic member 230 is fastened to the pressing member 228. As shown in Figure 9, one side is spaced apart from the shaft 222 is fastened to the handle portion of the impact member 224, the other side is fastened to the pressing member 228. The third elastic member 230 may be formed of a spring having a certain elastic force.

The pressing member 228 is installed on the upper surface of the top plate 226. Some may be inserted between the first elastic members 218 or attached to the bottom thereof. 9 illustrates a structure in which the pressing member 228 is inserted as an example. For example, when the first elastic member 218 is made of a spring, the pressing member 228 is partially inserted between the springs and pressed together when the first elastic member 218 is pressed.

The pressing member 228 is pulled by the first elastic member 218 and attracts the third elastic member 230 fastened to both ends, so that the impact member 224 impacts the piezoelectric member 214. .

The pressing member 228 may be made of, for example, a thin metal plate having flexibility. When the first elastic member 218 is pressed by the central portion of the thin metal plate, the remaining portion of the metal plate is driven to the central portion, which causes the third elastic member 230 to be pulled to pull the impact member 224.

The upper plate 216 may be provided with an accommodating part (not shown) so that the first elastic member 218 can be accommodated when the upper plate 216 is pressed against a portion corresponding to the first elastic member 218. At this time, the depth of the accommodating part should be shallower than the height of the initial state of the first elastic member 218, that is, the non-compressed state. Preferably, the height of the first elastic member 218 should be 1/2 or less.

One side of the first elastic member 218 is fastened to the lower portion of the footrest 210, the other side is fastened to the receiving portion of the upper plate 226. In such a structure, when an external force is applied to the scaffold 210, the scaffold 210 moves in the vertical direction to press the first elastic member 218 in the vertical direction.

The pressing member 228 inserted (or fastened) therein according to the pressure of the first elastic member 218 is pressed to attract the third elastic member 230 fastened to both ends. As a result, the impact member 224 fastened to the third elastic member 230 may impact the piezoelectric member 214 by pendulum movement.

As illustrated in FIG. 8, at least one fixing member 210a may be installed at both sides of the scaffold 210, that is, at both end portions thereof. In FIG. 8, four fixing members 210a are provided at two sides of the footrest 210, respectively, but the number is not limited thereto.

The fixing member 210a may be integrally formed with the scaffold 210 in the form of an outer wall, or may be fastened through the fastening member, and pressure is applied to the scaffold 210 downward from the outside so that the first elastic member 218 is When compressed, it is spread downward along the outer wall of the upper plate 216.

A fixing member 226 may be further installed on the scaffold 210. The fixing member 226 is for temporarily fixing the impact member 224, and serves to return the impact member 224 to its original state after all the pressure is removed. For example, the fixing member 226 may be made of a magnet. In the initial state, the impact member 224 is made of a metal material and is attracted to the magnetic force of the magnet before the pressure is applied to the scaffold 210. In this state, when an external force is applied to the scaffold 210, the crimping member 228 is pulled away from the magnet.

Fixing member 226 is installed on the footrest 210 to approach the impact member 224 as shown in FIG. In FIG. 8, a total of four pieces are installed in each of two sides in a symmetrical structure, but this is an example, and the number and positions of installation are not limited.

10 and 11 illustrate driving characteristics of a piezoelectric generator according to a second embodiment of the present invention.

Referring to FIG. 10, first, when an external force is applied to the scaffold 210 from the top to the bottom as in the arrow direction (vertical direction in the drawing), the scaffold 210 moves in the vertical direction to move the first elastic member 218 in the vertical direction. Pressurize The first elastic member 218 presses the center portion of the crimping member 228, and thus the impact member 224 fixed to the fixing member 226 of the foot plate 210 is separated from the fixing member 226, thereby piezoelectric ( 214) is instantaneously priced. At this time, since the force that strikes the piezoelectric body 214 is the same as applying the force to the piezoelectric body 214 in the same direction as the polarization direction of the piezoelectric body 214, the piezoelectric body 214 develops in the '33 mode '.

Referring to FIG. 11, in the state where the footrest 210 is pressed by an external force as in the first embodiment, an external force is applied in a direction horizontal to the ground (the arrow direction in the drawing) to move the footrest 210 to the right direction (on the drawing). In the direction of the arrow), the upper plate 216 is also moved to the right by the fixing member 210a of the footrest 210. At this time, since the lower plate 212 is fixed, the piezoelectric element 214 is deformed in the same shape as in the same plane. This leads to development in '15 mode '.

When the piezoelectric power is generated in the '15 mode 'using the piezoelectric element 214, the piezoelectric element 214 may be destroyed by an external force. In order to prevent this, a distance of several mm may be actually moved in the right direction by the external force. It is preferable to limit to the following. The actual travel distance is not distorted enough to be apparent as shown in FIG.

After the power generation of the piezoelectric generator is completed, if all external forces are removed, the components of the piezoelectric generator are returned to their original state by the elastic force of the first to third elastic members 218, 220, and 222.

As described above, although the technical spirit of the present invention has been described in detail in the preferred embodiments, it should be noted that the above-described embodiments are for the purpose of description and not for the purpose of limitation. As such, a person of ordinary skill in the art may understand that various embodiments are possible within the scope of the technical idea of the present invention.

1 is a schematic diagram illustrating the '31 mode 'of a piezoelectric generator.

Figure 2 is a schematic diagram showing for explaining the '33 mode 'of the piezoelectric generator.

3 is a schematic diagram illustrating a '15 mode 'of a piezoelectric generator.

Figure 4 is a front sectional view showing a piezoelectric generator according to the prior art.

Figure 5 is a front sectional view showing a piezoelectric generator according to the first embodiment of the present invention.

6 and 7 are front cross-sectional views for explaining the driving characteristics of the piezoelectric generator according to the first embodiment of the present invention.

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

9 is a front sectional view of the piezoelectric generator shown in FIG. 8.

10 and 11 are front cross-sectional views for explaining the driving characteristics of the piezoelectric generator according to the second embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

110, 210: Scaffold 112, 212: Lower board

114, 214: piezoelectric body 116, 216: top plate

112a, 212a: outer wall 110a, 210a: fixing member

118, 218: first elastic member 120, 220: second elastic member

230: third elastic member 222: shaft

226: fixing member (magnet) 224: impact member (hammer)

228: crimping member (metal plate)

Claims (14)

Scaffolding; Tops; Lower plate; A piezoelectric body bonded between the upper plate and the lower plate; A first elastic member connecting the scaffold and the upper plate; And A second elastic member connecting the outer wall of the lower plate and the outer portion of the upper plate Piezoelectric generator having a. The method of claim 1, And a fixing member installed on an outer side of the scaffold, and configured to fix the scaffold to the upper plate when pressure is applied to the scaffold from an upper portion thereof to compress the first elastic member. The method of claim 1, The piezoelectric generator is a piezoelectric generator that generates power in 15 modes after power generation in 31 modes. Scaffolding; Tops; Lower plate; A piezoelectric body bonded between the upper plate and the lower plate; A first elastic member connecting the scaffold and the upper plate; A second elastic member connecting the outer wall of the lower plate and the outer portion of the upper plate; An impact member having one side fixed to shafts provided at both sides of the scaffold to pendulum with the shaft; A pressing member installed on an upper surface of the upper plate and pressed by the first elastic member; And A third elastic member connected between the crimping member and the impact member to attract the impact member so that the impact member impacts the piezoelectric body when the crimping member is crimped; Piezoelectric generator having a. The method of claim 4, wherein And a fixing member installed on an outer side of the scaffold, and configured to fix the scaffold to the upper plate when pressure is applied to the scaffold from an upper portion thereof to compress the first elastic member. The method of claim 4, wherein The impact member, A handle fixed to the shaft; And Head portion which is installed at the end of the handle portion to impact the piezoelectric body Piezoelectric generator having a. The method of claim 6, The third elastic member is a piezoelectric generator connected to the handle portion. The method of claim 4, wherein The pressing member is a piezoelectric generator is a thin metal plate. The method of claim 4, wherein The scaffold and the upper plate is a piezoelectric generator provided with a space in the path that the impact member pendulum movement. The method of claim 4, wherein The scaffolding and the top plate is a piezoelectric generator having an 'H' shape. The method of claim 4, wherein Piezoelectric generator further provided with fixing members installed on both sides of the scaffold to secure the impact member. The method of claim 11, The fixing member is a piezoelectric generator is a magnet. The method of claim 4, wherein A piezoelectric generator having an accommodating part for accommodating the first elastic member on an upper portion of the upper plate. The method of claim 4, wherein The piezoelectric generator is a piezoelectric generator that generates power in 15 modes after power generation in 33 modes.

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