KR20090082527A - Piezoelectric vibration harvester, generating device with piezoelectric vibration energy harvester and driving method - Google Patents

Abstract

A piezoelectric element and generating apparatus using the same are provided to prevent damage by using polymer material and convert mechanical energy to electrical energy. A piezoelectric element(100) comprises a first piezo-plate(10), second piezo-plate(20), and reinforcing material(30). The first piezo-plate is made of polymer material. The second piezo-plate is connected to the first piezo-plate in parallel. The reinforcing material is placed between the first piezo-plate and second peizo-plate.

Description

Piezoelectric element, generator using piezoelectric element and driving method thereof {Piezoelectric vibration harvester, generating device with piezoelectric vibration energy harvester and driving method}

The present invention relates to a piezoelectric element, a power generation device using the piezoelectric element, and a driving method thereof. The piezoelectric element is composed of a piezoelectric material made of polymer and prevents damage to external vibration, while only a piezoelectric element vibrates at the end to generate electrical energy. The present invention relates to a power generation apparatus using a piezoelectric element that converts a planar motion of a piezoelectric element into a vertical and vertical motion to smoothly transmit vibration and output power.

Piezoelectric materials are a key element of piezoelectric generators and have various applications. A large number of materials including inorganic and organic materials are known as piezoelectric materials, and materials such as PZT, BaTiO ₃ and Ba ₂ TiO ₄ are commonly used as piezoelectric materials.

The piezoelectric material made of the piezoelectric material as described above generates a voltage by the force applied to the piezoelectric material, and the amount of generated voltage is changed according to the magnitude of the applied force.

In manufacturing a piezoelectric generator using such a piezoelectric material, it is important to effectively reduce the loss to the piezoelectric body against external shock or vibration.

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 damage to the piezoelectric body from excessive external force is required.

In addition, there is a problem in that power generation based on a simple planar movement, not vibration in the up and down direction, must be provided with a device capable of effectively transmitting vibration to the piezoelectric generator.

The present invention has been made in order to solve the above problems, it is to provide a piezoelectric element capable of preventing damage and converting mechanical energy into electrical energy by using a piezoelectric material of a polymer material. 1 purpose.

It is a second object of the present invention to provide a power generating apparatus and a driving method thereof capable of generating power by generating vibration in the vertical direction through the movement in a planar motion state and converting the vibration into electrical energy.

Other objects, specific advantages, and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments associated with the accompanying drawings.

The piezoelectric element according to the present invention includes a first piezoelectric plate 10 made of a polymer material; A second piezoelectric plate 20 connected in parallel with the first piezoelectric plate 10; And a reinforcement 30 between the first piezoelectric plate 10 and the second piezoelectric plate 20, and the length of the reinforcement 30 is longer.

In particular, the material of the first piezoelectric plate and the second piezoelectric plate is composed of PVDF.

In particular, the material of the reinforcing material is any one of stainless steel plate, brass plate, PET.

In particular, the first piezoelectric plate and the second piezoelectric plate are configured to have a width that increases from the fixed end side to the free end side.

The first piezoelectric plate and the second piezoelectric plate have a shape having the largest width at a point 2/3 from the fixed end side to the free end side.

A polymer material bead located in the grooved plate; An axis in which the beads are in close contact with the side surface; A cog wheel positioned at the end of the shaft; It consists of a piezoelectric element with one end held between the teeth of a cog wheel.

Wheels located perpendicular to the plate; An axis penetrating the center of the wheel; A gear that rotates about an axis; It consists of a piezoelectric element with one end sandwiched between the teeth of a cog wheel.

In particular, a rectifier for converting the electrical energy output from the piezoelectric element into a direct current; A capacitor for storing electrical energy from the rectifier; A battery monitoring chip for monitoring the amount of charge stored in the capacitor; It further includes a regulator for performing a charging process from the voltage data from the battery monitoring chip.

In particular, the voltage output from the regulator is 2.4V to 3V.

In particular, further comprising a bearing between the plate and the wheel allows the wheel to rotate 360 ° around the vertical axis of the plate.

In particular, the teeth of the cog wheels are oval-shaped.

The driving method of the power generator using the piezoelectric element according to the present invention comprises a plane motion step (S110) of the power generator using the piezoelectric element; The ball coming out through the groove of the plate rotates in accordance with the plane motion, and transmitting the rotational force according to the rotation to the shaft (S210); Rotating the cog wheel 540 using the rotational force transmitted to the shaft 540 (S310); (S410) vibrating the cogwheel 520 and the piezoelectric element that is bitten by the rotation of the cogwheel 520; Rectifying the electrical energy generated by the vibration of the piezoelectric element with a direct current (S510); Outputting the stored electrical energy is made (S610).

Method of driving a power generation apparatus using a piezoelectric element according to the present invention comprises the steps of rotating the wheel under the plate (S120); Rotating the gear wheel is connected to the axis and the axis in the center of the rotation of the wheel (S220); Vibrating the cogwheel and the piezoelectric element that is bitten by the rotation of the cogwheel (S320); Rectifying the electrical energy generated by the vibration of the piezoelectric element with a direct current (S420); Storing electrical energy rectified by DC in a condenser (S520); Outputting the stored electrical energy (S620); consists of.

The piezoelectric element using the piezoelectric material according to the present invention can be used without being damaged by vibration caused by the rotation of the cogwheel by configuring the piezoelectric material with a polymer material.

When the external force in the piezoelectric element is in the direction of planar motion, it is converted into vertical vibration and thus power can be produced by planar motion alone. In addition, since the current output from the power generation device using the piezoelectric element can be stored and output at a voltage set by the user, it can be applied as an auxiliary power source for small electronic devices.

In addition, a finite element analysis program (FEM) and an optimization algorithm can be used to design a large current output under limit conditions.

Hereinafter, with reference to the accompanying drawings will be described the configuration and operation of the present invention.

1 is a cross-sectional view showing the configuration of a piezoelectric element according to the present invention. As shown in FIG. 1, the piezoelectric element includes a support 60 to which a power generation device can be fixed, first and second piezoelectric plates 10 and 20 coupled to the support 60, and such first and second piezoelectric elements. Between the plates (10, 20) is composed of a reinforcement (30) for preventing damage to external stress.

The conductive copper tape 40 is positioned between the first and second piezoelectric plates 10 and 20 and the reinforcing material 30. The conductive copper tape 40 is connected to external charge storage means through the wire 50.

One end of the piezoelectric element 100 is configured such that the length of the reinforcing material 30 is longer than that of the first and second piezoelectric plates 10 and 20, and the reinforcing material 30 protrudes. At this time, the portion where the reinforcing material 30 protrudes is a free end, and the other end is a fixed end. The first and second piezoelectric plates 10 and 20 are in the form of flat plates. As the material of the first and second piezoelectric plates 10 and 20, piezoelectric materials such as PZT may be used.

Piezoelectric material is a material exhibiting a piezoelectric effect. Here, the piezoelectric effect refers to a phenomenon in which mechanical energy and electrical energy are mutually converted. In other words, when pressure or vibration is applied, electricity is generated.

Crystals, tourmalines, roselle salts and the like are known from the past, and artificial crystals such as barium titanate, ammonium dihydrogen phosphate and ethylenediamine tartarate show remarkable piezoelectricity.

Among such materials, the piezoelectric element according to the present invention uses a material called polyvinylidine fluride (PVDF) as the first and second piezoelectric plates 10 and 20. PVDF is a tetragonal crystal structure with three orthogonal crystal axes of different lengths and two axes of symmetry parallel to the major axis. Optically anisotropic and biaxial.

But it has the same flexibility as vinyl, so it is applied to headphones and speakers.

Table 1 is a table showing the physical properties required for piezoelectric materials.

Table showing the properties of piezoelectric material Properties unit PZT PVDF Strain coefficient (d ₃₁ ) ^10-12 m / v -320 20-28 Strain Factor (d ₃₃ ) 10 ^-12 m / v 650 -30--33 Coupling Factor (k ₃₁ ) CV / Nm 0.44 0.11-0.12 Coupling Factor (k ₃₃ ) CV / Nm 0.75 0.14-0.2 Dielectric constant ε / ε ₀ 3800 12-13 Modulus of elasticity 10 ¹⁰ N / m 5.0 0.2-0.4 The tensile strength 10 ⁷ N / m 2.0 4.5 ~ 5.5

As shown in [Table 1], having a high strain rate and an electromechanical coupling coefficient is excellent in converting mechanical energy into electrical energy.

Since the value of d ₃₃ , k ₃₃ is greater than the value of d ₃₁ , k ₃₁ , d ₃₃ Mode piezoelectric generator shows better physical properties. However, in reality, since it is difficult to apply uniform force to the thin piezoelectric material in the same direction as the polarization direction, most of the piezoelectric generators 100 except for the special purpose are manufactured to operate in the d ₃₁ mode.

2A and 2B are schematic diagrams showing a mode d _{31 and} mode d ₃₃ that can be operated in the piezoelectric element 100. As shown in FIGS. 2A and 2B, d _{31 and} d ₃₃ indicate an operation mode of the piezoelectric element 100. The mode shown in FIG. 2A is a d ₃₁ mode. D ₃₁ is a mode in which the axis of external force is perpendicular to the axis of polarization. On the other hand, the mode shown in FIG. 2B is the d ₃₃ mode. This d ₃₃ is a mode in which the axis to which an external force is applied and the polarization axis are parallel.

In general, the piezoelectric material has a very high impedance, which generates high voltages and low currents even at small deformations. Therefore, a material having a high dielectric constant is preferred for the piezoelectric generator 100 to lower the impedance.

The elastic modulus affects the stiffness of the piezoelectric element 100 to change the primary natural frequency. The maximum output of the piezoelectric generator 100 is a resonance when the excitation frequency and the natural frequency are the same, but when the maximum stress exceeds the tensile strength, there is a possibility of plastic deformation.

Polarization refers to a phenomenon in which dipoles are arranged in response to high voltage from the outside. When pressure is applied to the polarized piezoelectric material, the length between the dipoles is changed to affect the polarization, and the current density at both ends of the crystal increases due to the polarization generated as the material is compressed. At this time, if both ends of the conductive copper tape 40 is separated, a voltage difference occurs, and if the conductive copper tape 40 at both ends is in contact with the current flows.

When the piezoelectric element 100 is made of only one piezoelectric material, the neutral shaft is inside the piezoelectric material, and tension and compression occur simultaneously on the upper and lower surfaces. As a result, two polarizations occur in one piezoelectric material, and almost no current flows. Therefore, most piezoelectric elements 100 are used by attaching two piezoelectric materials up and down without attaching a piezoelectric material on a metal plate or without a reinforcing material 30. At this time, it is divided into series connection and parallel connection according to the connected polarization direction.

3A and 3B are schematic diagrams showing a direction in which voltage is applied when the piezoelectric materials according to the present invention are connected in series and when connected in parallel. As shown in FIG. 3A, the polarization directions face each other when the piezoelectric materials are connected in series, and the polarization directions are parallel when the piezoelectric materials are connected in parallel.

3A shows a series connection of piezoelectric elements. In the case of series connection, piezoelectric material is attached so as to be in the opposite polarization direction with respect to the neutral surface, and if the conductive adhesive is not used, the conductive copper tape 40 must be attached to the adhesive surface to connect the electric wire 50. ) Requires two or more. When vibrating, the top and bottom sides have opposite voltage distributions, so in open circuits the voltage distribution is twice as different as in parallel connections. It is mainly used in piezoelectric motors because externally applied voltages are distributed in layers.

3B shows a parallel connection of the piezoelectric elements 100. The parallel connection attaches the piezoelectric material to be in the same polarization direction with respect to the neutral plane, and three wires 50 are required. In an open circuit, the voltage distribution is 1/2 of a series connection, but when used as a generator, the same phase current comes from the top and bottom. Thus, twice the current and four times the power are output than on a single side.

In the piezoelectric generator 100 according to the present invention, a very flexible polymer called PVDF is used as the piezoelectric material. Accordingly, the reinforcing material 30 is used. Used as such a reinforcing material 30 is PET. It is also possible to use a stainless steel plate or a brass plate as the reinforcing material (30).

4 is a constant voltage output circuit diagram connected to an output portion of a piezoelectric element according to the present invention. As shown in FIG. 4, the current output through the conductive copper tape 40 of the piezoelectric element 100 is converted into a direct current in the rectifier 410.

However, since the output current of the piezoelectric element 100 is an order of magnitude, the regulator 440 cannot directly operate. Therefore, as shown in FIG. 4, a comparator or a battery monitoring chip 430, which is a circuit that first stores a certain amount of charge in the capacitor 420 and then sends it to the regulator 440, is required. By adjusting the external resistance value attached to the battery monitoring chip 430, it is possible to determine whether the regulator 440 is operating according to the voltage of the storage capacitor 420. The voltage of such a storage capacitor 420 is composed of 2.4 to 3V.

( Example  One)

5 is a schematic diagram showing the configuration of a power generator using the piezoelectric element 100 according to the first embodiment of the present invention. As shown in FIG. 5, in the case of a forced vibration device using a ball mouse, a bead 510 made of a polymer material and a cog wheel 520 capable of checking the rotation speed according to the rotation of the bead 510 are included. It is. In the case of the power generation apparatus using the piezoelectric element according to the present invention, one side is positioned on the tooth 530 of the gear 520 and the other side is coupled to the end of the support 60.

In addition, the beads 510 are located on the plate 200 to reach the floor through grooves (not shown) having a diameter smaller than the diameter of the beads 510. This is to rotate the beads 510 when the forced vibration device is moved back and forth and left and right.

Forced vibration device configured as described above rotates the cogwheel 520 as the axis connected to the side of the ball 510 is rotated when the ball 510 located on the plate 200 rotates.

The piezoelectric element 100 is present between the teeth 530 of the cog wheel 520 so that one end of the piezoelectric element 100 vibrates up and down when the gear 520 rotates. This is the driving force for generating piezoelectric power.

At this time, the piezoelectric material PVDF is connected in parallel, PET is placed as a reinforcing material 30 between the PVDF. By the way, this reinforcing material 30 is configured to be longer than the PVDF.

This is to transmit the vibration to the piezoelectric material, but to prevent the piezoelectric material from breaking the PVDF due to the direct impact.

6 is a side sectional view showing the configuration of a power generation apparatus using a piezoelectric element according to a first embodiment of the present invention. As shown in FIG. 6, the support 60 extending vertically from the bottom protrudes from the bottom 520 of the polymer material. And the piezoelectric element 100 is coupled to the center of the support (60). At the same time, there is a shaft 540 connected to the cog wheel 520 on the side of the bead 510. So, when the ball 510 rotates, the shaft 540 connected with the cog wheel 520 rotates. Then, the reinforcing material 30 of the piezoelectric element 100 held between the teeth 530 of the gear 520 is subjected to vibration, and the vibration is transmitted to the piezoelectric element 100. The vibration transmitted as described above becomes mechanical energy that is an input of the piezoelectric element 100, which generates a potential difference on the upper and lower surfaces of the piezoelectric element 100 to flow a current.

In FIG. 6, the shape of the tooth 530 of the cog wheel 520 is expressed in an elliptical form different from the normal shape. This can achieve the effect of generating no noise compared to the tooth 530 of the gear 520 is trapezoidal.

The driving method of the power generator using the piezoelectric element 100 is as follows. First, the power generator using the piezoelectric element 100 performs a planar motion (S110). In accordance with the planar motion is rotated beads 510 coming out through the groove of the plate 200. When the ball 510 rotates, the rotational force is transmitted to the shaft 540 (S210). When the rotational force is transmitted to the shaft 540, the gear 520 is rotated (S310). The rotation of the gear 520 induces vibration of the piezoelectric element 100 (S410). The vibration is transmitted to the piezoelectric element 100 to generate a voltage between the first piezoelectric plate 10 and the second piezoelectric plate 20 (S510).

The AC voltage is rectified to DC through the rectifier 410 (S610). And the electric energy rectified by the direct current is stored in the condenser 420 (S710). The electrical energy stored in this way is configured to output power when necessary for the forced vibration device attached piezoelectric generator (S810).

( Example  2)

7 is a schematic diagram showing the configuration of a power generation apparatus using a piezoelectric element according to a second embodiment of the present invention. As shown in FIG. 7, the plate 200 is provided with a groove 730 for fitting the bearing 810. The wheel support 720 is vertically coupled thereto, the wheel 710 is located below the wheel support 720, the shaft 540 is to pass through the center of the wheel 710.

And the outer surface of the wheel 710 is a tooth 530 of the gear 520 is located is configured to be connected to the end of the piezoelectric element (100). As in FIG. 5, the free end of the piezoelectric element 100 is positioned at the tooth 530 of the cog wheel 520, and the reinforcement 30 is protruded at the end of the free end, so that vibration is directly transmitted to the PVDF. Prevent.

5 and 6, the shape of the tooth 530 of the gear wheel 520 may be configured in an elliptical shape instead of a trapezoidal shape to reduce noise.

The piezoelectric element 100 according to the second embodiment is disposed to be perpendicular to the axis 540 of the cog wheel 520. Thus, when the gear 520 rotates, the vibration is transmitted to the piezoelectric element 100.

In such a device, a bearing 810 is connected between the plate 200 and the wheel support 720 so that the wheel support 720 may rotate 360 ° with respect to the plate 200.

8 is a side cross-sectional view showing the configuration of a power generator using the piezoelectric element 100 according to the second embodiment of the present invention. As shown in FIG. 8, when the plate 200 moves forward, backward, left, and right, the wheel 710 in close contact with the ground rotates together, and the gear 520 attached to the shared shaft 540 rotates together.

The piezoelectric element 100 is positioned between the teeth 530 of the cog wheel 520 so that the vibration of the teeth 530 of the cog wheel 520 is transmitted to the piezoelectric element 100. Due to this vibration, a current is generated in the piezoelectric element 100. 8 shows that only one piezoelectric element 100 is installed, but it is also possible to install a plurality of piezoelectric elements 100 by changing the position of the support 60.

Referring to the driving method of the power generator using the piezoelectric element 100 that can be applied to the caster wheel as shown in FIG. The wheel 710 under the plate 200 starts to rotate (S120). The rotation of the wheel 710 rotates the central shaft 540 and the cogwheel 520 connected to the central shaft 540 (S220). As the gear 520 rotates, the piezoelectric element 100 that is bitten by the gear 520 starts to vibrate (S320). The vibration of the piezoelectric element 100 generates electrical energy as in FIG. 6 (S420).

Electrical energy generated at this time is rectified by the DC in the rectifier 420 (S610). And it stores the electrical energy rectified by the direct current (S710). The electrical energy thus stored becomes the output of the forced vibration device attached piezoelectric generator (S810).

9 is a flowchart showing an optimal design method for maximizing an objective function under constraint conditions for designing the piezoelectric element 100. As shown in FIG. 9, the amount of current calculated by finite element analysis is called using a programming language called MATLAB, and an optimization process is performed using the SQP algorithm. After dividing the surface of the piezoelectric generator 100 into three or four parts, the length of the corresponding width is determined as a design variable, and both ends of the width are connected by a spline curve to describe the shape.

First, the matlab determines the width of the initial shape and then calls the finite element analysis program (ANSYS) to calculate the area, the output current amount, and the stress of the initial shape (S10). Based on these analysis values, the harmonic analysis is performed after setting upper and lower design variables, maximum number of sequential numbers, Δx of design variables of the finite difference method, tolerance of convergence conditions, and constraint conditions (S20, S30, S40). . The range of the harmonic analysis assumes a state in which the tooth 530 of the cog wheel 520 vibrates at about 1000 Hz or less during planar motion. Constraints are divided into the case of limiting the initial PVDF within the area and the case of limiting the area within the upper and lower design variables without the area limit.

At this time, the optimization design to maximize the average current of the piezoelectric element. The average current is the average of the values sampled between 10 and 1000 Hz.

After performing such a task, after checking whether the constraint condition and the convergence condition are satisfied, the task of changing the design variable is repeated (S60 and S61).

Even if the number of design variables is changed from four to five, the material drift toward the free end is similarly repeated. If the objective function maximizing the average current through this process converges, the driving of the optimal design program using the matlab is terminated (S70).

10 and 11 are perspective views showing the shape of the piezoelectric element 100 obtained using the matlab and the finite element analysis program under the conditions within the initial width. As shown in FIG. 10, when the width is limited, it is designed to have the largest width at a point 2/3 from the fixed end. At this time, as shown in FIG. 10, the reinforcing material 30 is positioned between the first piezoelectric plate 10 and the second piezoelectric plate 20.

12 and 13 are cross-sectional views showing the shape of the piezoelectric element 100 obtained using the matlab and the finite element analysis program when there is no limit to the initial width. As shown in FIG. 13, it is advantageous to obtain a maximum current by designing the piezoelectric material to be distributed in a large amount at the free end. And when there is no restriction condition within the initial width, the piezoelectric element has a shape in which the width increases from the fixed side to the free end side and then decreases in width.

From this, the piezoelectric generator 100 can be used to design the shape of the piezoelectric material capable of storing charge and outputting a large amount of current.

1 is a cross-sectional view showing the configuration of a piezoelectric element according to the present invention

Figure 2a, b is a schematic diagram showing the d ₃₁ mode and d ₃₃ mode that can be operated in the piezoelectric element.

3A and 3B are schematic diagrams showing directions in which voltage is applied when the piezoelectric generators according to the present invention are connected in series and in parallel.

Figure 4 is a constant voltage output circuit connected to the output portion of the piezoelectric element according to the present invention.

5 is a schematic diagram showing the configuration of a power generation apparatus using a piezoelectric element according to a first embodiment of the present invention.

Figure 6 is a side cross-sectional view showing the configuration of a power generator using a piezoelectric element according to a first embodiment of the present invention.

7 is a schematic diagram showing the configuration of a power generation apparatus using a piezoelectric element according to a second embodiment of the present invention;

Figure 8 is a side cross-sectional view showing the configuration of a power generator using a piezoelectric element according to a second embodiment of the present invention.

9 is a flow chart showing a design method for optimizing the current according to the shape of the piezoelectric element.

Fig. 10 is a perspective view showing the shape of the piezoelectric element obtained by limiting the width and using the matlab and the finite element analysis program.

 11 is a cross-sectional view showing the shape of the piezoelectric element obtained by using a matlab and a finite element analysis program to limit the width.

12 is a perspective view showing the shape of a piezoelectric element obtained using a matlab and a finite element analysis program when there is no initial width constraint.

FIG. 13 is a cross-sectional view showing the shape of the piezoelectric element 100 obtained using the matlab and the finite element analysis program when there is no limit to the initial width.

<Code Description of Main Parts of Drawing>

10: first piezoelectric plate, 20: second piezoelectric plate,

30: reinforcing material, 40: conductive copper tape,

50: wire, 60: support,

70: gear support, 100: piezoelectric element,

200: plate, 410: rectifier, 420: capacitor, 430: battery monitoring chip, 440: regulator, 450: reverse current prevention diode, 510: bead, 520: gear, 530: tooth, 540: shaft,

710: wheels, 720; wheel support,

730: groove, 810; bearing,

Claims (14)

A first piezoelectric plate 10 made of a polymer material; A second piezoelectric plate 20 connected in parallel with the first piezoelectric plate 10; And A reinforcement member 30 between the first piezoelectric plate 10 and the second piezoelectric plate 20, the length of the reinforcement member 30 is longer, and one end of the reinforcement member 30 protrudes from a free end thereof. And the other end is a fixed end. The method of claim 1, The piezoelectric element, characterized in that the material of the first piezoelectric plate (10) and the second piezoelectric plate (20) is made of PVDF. The method of claim 1, The material of the reinforcing material 30 is a piezoelectric element, characterized in that any one of stainless steel plate, brass plate, PET. The method of claim 1, The first piezoelectric plate (10) and the second piezoelectric plate (20) is a piezoelectric element, characterized in that configured in a shape that increases in width from the fixed end side to the free end side. The method of claim 1, The first piezoelectric plate (10) and the second piezoelectric plate (20) is a piezoelectric element, characterized in that the width of the point that is two-thirds from the fixed end side toward the free end side. Beads 510 of a polymer material positioned on the plate 200 having grooves; A shaft 540 in close contact with the side surface of the bead 510; A cog wheel 520 positioned at an end of the shaft 540; The piezoelectric element 100, one end is sandwiched between the teeth 530 of the cog wheel (520); Power generator using a piezoelectric element, characterized in that consisting of. A wheel 710 positioned perpendicular to the plate 200; A shaft 540 penetrating the center of the wheel 710; A cog wheel 520 rotating about the shaft 540; The piezoelectric element 100, one end is sandwiched between the teeth 530 of the cog wheel (520); Power generator using a piezoelectric element, characterized in that consisting of. The method according to claim 6 or 7, A rectifier 410 for converting electrical energy output from the piezoelectric element 100 into direct current; A condenser 420 for storing electrical energy from the rectifier 410; A battery monitoring chip 430 for monitoring the amount of charge stored in the capacitor 420; And a regulator (440) for performing a charging process from the voltage data from the battery monitoring chip (430). The method of claim 8, Power generator using a piezoelectric element, characterized in that the voltage output from the regulator 440 is 2.4 ~ 3V. The method of claim 7, wherein Piezoelectric characterized in that it further comprises a bearing 810 between the plate 200 and the wheel 710, the wheel 710 can be rotated 360 ° around the vertical direction of the plate 200 Generator using device. The method according to claim 6 or 7, The gear 530 of the gear wheel 520 is a power generator using a piezoelectric element, characterized in that the shape of the oval. In a method of driving a power generator using a piezoelectric element, Planar motion step (S110) of the power generator using the piezoelectric element (100); The ball 510 is rotated through the groove of the plate 200 in accordance with the plane motion, and transmitting the rotational force according to the rotation to the shaft (540) (S210); Rotating the cog wheel 520 by using the rotational force transmitted to the shaft 540 (S310); Vibrating the cogwheel (520) and the piezoelectric element (100) being bitten by rotating the cogwheel (520) (S410); And Generating electric energy by the vibration of the piezoelectric element (100) (S510); Method of driving a power generation apparatus using a piezoelectric element, characterized in that consisting of. In a method of driving a power generator using a piezoelectric element, Rotating the wheel 710 below the plate 200 (S120); Rotating the wheel 710 to rotate the gear 520 connected to the central shaft 540 and the central shaft 540 (S220); Vibrating the cogwheel 520 and the piezoelectric element 100 which is bitten by the rotation of the cogwheel 520 (S320); And Generating an electric energy by the vibration of the piezoelectric element (100) (S420); Method of driving a power generation device using a piezoelectric element characterized in that consisting of. The method according to claim 12 or 13, Converting mechanical energy into electrical energy and rectifying the rectifier to DC in the rectifier 410 (S610); Storing the electrical energy rectified by the direct current in the condenser (420) (S710); And Outputting the stored electrical energy (S810); Method of driving a power generation apparatus using a piezoelectric element further comprising.

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