KR101072302B1 - self-generating mat - Google Patents

Abstract

The present invention relates to a mat, and more particularly to a self-powered mat using kinetic energy by external force.

Self-powered mat according to the present invention, the mat body; An elastic fluid bag formed on an upper portion of the mat body and repeating contraction and expansion by an external force; A fluid cylinder connected to the elastic fluid bag and a connection pipe, the fluid cylinder changing a pressure of an embedded fluid according to contraction and expansion of the elastic fluid bag; A piezoelectric piston for generating electrical energy by deforming a plurality of plate-shaped piezoelectric elements in a reciprocating motion according to a pressure change of a fluid; And an output terminal connected to the piezoelectric piston and outputting electrical energy to the outside of the mat body.

The present invention has an effect of sufficiently performing a buffering action and the like and improving the energy conversion efficiency of the self-powered mat. In addition, there is an effect that can prevent damage to the self-powered mat from the external force. In addition, it is possible to simplify the production process of the self-powered mat, there is an effect that can reduce the production cost.

Self-powered mat, elastic fluid bag, piezoelectric piston, secondary battery

Description

Self-generating mat

The present invention relates to a mat, and more particularly to a self-powered mat using kinetic energy by external force.

Recently, entrance mats used as rugs for entrances to general homes, shops and restaurants, exercise mats used to prevent danger when exercising, such as gymnastics and judo, other kindergarten safety mats and floor mats Various kinds of mats are manufactured according to various needs of consumers, such as runner mats, and special mats having special functions are also variously released. As such, the mat is gradually evolving from simply acting as a rug to a device having a variety of functions. For example, a heating mat for heating, an acupressure mat that is formed with unevenness to obtain acupressure effect, and a sensing mat that detects an external force of a pedestrian and uses it for various purposes are mats that highlight their functionality for each purpose. Increasingly, the yield of these functional mats is increasing.

On the other hand, due to the serious problems of environmental pollution and energy depletion due to the use of fossil fuels, research on alternative energy is being actively conducted. Alternative energy sources are wind energy, hydro energy, solar energy, and bio energy. Alternative energies have the advantage of being clean and free of depletion, as well as pollution-free renewables. On the other hand, the energy density is so low that it is not practical in places where a large amount of energy is required, and because solar or wind are affected by the climate, an auxiliary power generation facility is required, and other alternative energies are less efficient or economical. Have. Therefore, countries around the world are trying to develop alternative energy that can replace fossil fuels and nuclear power and can be used in large quantities over a long period without harming the environment or human body.

Based on the recent technical trends described above, the development of self-powered mats for converting kinetic energy from external forces applied to the mat into electrical energy is rapidly increasing.

However, the self-powered mats must be effective enough to sufficiently perform the buffer function, which is the basic function of the mat, and to use the energy converted when converting kinetic energy such as pedestrian walking into other energy in daily life. In addition, since the additional self-powered device is additionally provided, the self-powered device must be robust enough to withstand repeated external force, and the main problem that the production cost is appropriate and the production process is simple so that there is no problem in production. Is holding.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a self-powered mat capable of sufficiently performing a buffer function, which is a basic function of the mat, and improving the energy conversion efficiency.

It is also an object of the present invention to provide a self-powered mat that can withstand repeated external forces sufficiently.

It is also an object of the present invention to provide a self-powered mat that can simplify the production process and reduce the production cost.

The problem to be solved by the present invention is not limited to the above-mentioned problem, another problem to be solved by the present invention not mentioned here is those skilled in the art from the following description. Will be clearly understood.

Self-powered mat according to the present invention, the mat body; An elastic fluid bag formed on an upper portion of the mat body and repeating contraction and expansion by an external force; A fluid cylinder connected to the elastic fluid bag and a connection pipe, the fluid cylinder changing a pressure of an embedded fluid according to contraction and expansion of the elastic fluid bag; A piezoelectric piston for generating electrical energy by deforming a plurality of plate-shaped piezoelectric elements in a reciprocating motion according to a pressure change of a fluid; And an output terminal connected to the piezoelectric piston and outputting electrical energy to the outside of the mat body.

The mat main body of the present invention is characterized in that a plurality of power generation sets are formed using an elastic fluid bag, a fluid cylinder, and a piezoelectric piston as one power generation set.

A plurality of piezoelectric piston of the present invention is characterized in that connected to one output terminal.

The piezoelectric piston of the present invention is fixed to the fluid cylinder at intervals, and the plurality of plate-like piezoelectric elements having a center portion drilled therebetween, and the plurality of protruding plates formed at intervals on the outer circumferential surface reciprocate the center portion of the piezoelectric element. And a rectifying circuit chip connected to each of the piezoelectric elements, the rectifying circuit chip rectifying electrical energy.

The piezoelectric element of the present invention is characterized by using a single layer piezoelectric material mixed with PZT and PVDF.

The present invention is formed between the piezoelectric piston and the output terminal, characterized in that it further comprises a secondary battery for storing electrical energy.

The secondary battery of the present invention is characterized by being detached from the mat body.

According to the above-mentioned problem solving means, the present invention has the effect that the self-powered mat can sufficiently perform the buffering action and improve the energy conversion efficiency.

In addition, the present invention has the effect of preventing damage to the self-powered mat from repeated external force.

In addition, the present invention can simplify the production process of the self-powered mat, there is an effect that can reduce the production cost.

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

<First Embodiment>

1 and 2 are views for explaining a self-powered mat according to a first embodiment of the present invention. Specifically, FIG. 1 is a view schematically showing a plane of a self-powered mat, and FIG. 2 is a view schematically showing a side of a self-powered mat. Substantially, the main components are not revealed in the appearance of the self-powered mat, but the main components are shown on the mat body 110 to better explain the self-powered mat according to the first embodiment of the present invention. Some differences in the arrangement of the main components of FIGS. 1 and 2 are also based on the above reasons.

1 and 2, the self-powered mat according to the first embodiment of the present invention is a mat body 110, elastic fluid bag 120, fluid cylinder 130, piezoelectric piston 140 and output And terminal 150.

The mat body 110 forms the outer shape of the mat. That is, the mat body 110 performs a function as a general mat. For example, the self-powered mat according to the first embodiment of the present invention is used to prevent danger when exercising, such as an entrance mat used as a rug in an entrance door of a general home, a store, a restaurant, gymnastics, judo, or the like. It is used as an exercise mat, other kindergarten safety mats, floor mats, runner mats, and the like, and performs cushioning, which is a basic function of the mat.

The elastic fluid bag 120 is a bag made of a material having elasticity, and has an entrance and exit 121 formed therein. The elastic fluid bag 120 usually maintains a shape as shown in FIG. 2 and contains a fluid. Here, the fluid may be any of air, water, oil, etc. as necessary. When an external force is applied, the elastic fluid bag 120 is deformed and deformed, and discharges the fluid therein to the doorway 121. When the applied external force is blocked, the elastic fluid bag 120 is expanded by elasticity and restored to the usual shape, and the fluid is sucked into the entrance 121.

The elastic fluid bag 120 is formed on the top of the mat body 110, the entrance 121 is connected to the fluid cylinder 130 through the connecting pipe 132. Accordingly, contraction and expansion are repeated by external force applied by walking or the like, and the internal fluid of the elastic fluid bag 120 is allowed to enter and exit. Specifically, the fluid is discharged to the doorway 121 when contracted, and the fluid is sucked to the doorway 121 when expanded. Thus, the elastic fluid bag 120 converts kinetic energy, such as walking, into fluid flow energy, that is, fluid pressure energy, through contraction and expansion operations.

The fluid cylinder 130 is a cylinder made of a curable material that does not change in shape as the fluid moves, and has an entrance and exit 131 formed therein. The fluid cylinder 130 contains the fluid and the piezoelectric piston 140.

The inlet 131 of the fluid cylinder 130 is connected to the elastic fluid bag 120 through the connection pipe 132, thereby changing the pressure of the fluid contained in accordance with the contraction and expansion of the elastic fluid bag 120. Specifically, when the elastic fluid bag 120 shrinks, the fluid is sucked into the inlet 131 so that the fluid pressure to the front of the fluid cylinder 130 is relatively increased, and the elastic fluid bag 120 is expanded into the inlet 131. The fluid is discharged so that the fluid pressure relative to the rear of the fluid cylinder 130 increases relatively.

The piezoelectric piston 140 includes a plurality of plate-like piezoelectric elements 141 to generate electrical energy from kinetic energy. The piezoelectric piston 140 is embedded in the fluid cylinder 130 to reciprocate according to the pressure change of the fluid. Specifically, when the fluid pressure relative to the front of the fluid cylinder 130 increases relatively, when the piezoelectric piston 140 moves forward and the fluid pressure relative to the rear of the fluid cylinder 130 increases relatively, The piezoelectric piston 140 moves rearward. Accordingly, the piezoelectric element 141 deforms, and electrical energy is generated by the deformation of the piezoelectric element 141. A more detailed description of the configuration, features, operating characteristics, and the like of the piezoelectric piston 140 for further improving the energy conversion efficiency of the self-generating mat of the present invention will be described later with reference to FIGS. 3 and 4.

The output terminal 150 is a terminal for outputting electrical energy in an electrical circuit, is connected to the piezoelectric piston 140, and outputs the electrical energy generated by the piezoelectric piston 140 to the outside of the mat body 110. The output terminal 150 may be directly connected to the LED display board installed in the entrance or the like of a store or a restaurant, or directly used as a power source of the LED display board, or connected to a portable electronic device such as an MP3 or a mobile phone. Since the portable electronic device requires a voltage of about 3V, the output terminal 150 includes an adapter circuit for adjusting a voltage value.

On the other hand, as shown in Figure 1, when the mat body 110 according to the first embodiment of the present invention is large enough area, the elastic fluid bag 120, the fluid cylinder 130 and the piezoelectric piston 140 It is possible to form a plurality of power generation sets by using) as one power generation set. In addition, by connecting the plurality of piezoelectric pistons 140 with one output terminal 150, by synthesizing the electrical energy generated by each piezoelectric piston 140, it is possible to improve the energy conversion efficiency.

As such, the self-powered mat according to the first embodiment of the present invention outputs and uses electrical energy generated by converting kinetic energy, such as walking, through the piezoelectric piston 140 to the outside, without additional fuel and environmental pollution. The generated electrical energy can be used.

In addition, as the elastic fluid bag 120 provides a cushioning function of the mat by the contraction and expansion operation, the self-powered mat according to the first embodiment of the present invention, the entrance mat, exercise mat, other kindergarten safety mat It is used as a floor mat, a runner mat, etc., and can perform the buffer function which is a basic function of a mat.

In addition, in the first embodiment of the present invention, the pressure of the piezoelectric piston 140 is reciprocated by rapidly raising the fluid pressure by an instantaneous external force, and the plurality of piezoelectric elements 141 are continuously deformed in the front-rear direction by the reciprocating motion. Point, the point that synthesizes the electric energy generated from a plurality of power generation set, and the point that the fluid is used as a means of transmission of external force to reduce the loss of friction, etc. By using it for conversion into energy, the energy conversion efficiency of the self-generating mat can be improved.

In addition, by forming the elastic fluid bag 120 in the upper portion of the mat body 110, it is possible to absorb the impact by repeated external force, such as walking, by the contracting operation of the elastic fluid bag 120. In addition, the piezoelectric piston 140 is inherent in the fluid cylinder 130 and formed on one side of the mat body 110 having a relatively weak external force (for example, on the side of the mat body or below the elastic fluid bag 120). Can protect from external force. Accordingly, it is possible to prevent the self-powered mat from being damaged by repeated external force.

In addition, the above-described functional parts are formed only inside the mat body 110, and since the configuration thereof is relatively simple, the production process of the self-powered mat can be simplified, and the production cost can be reduced.

3 and 4 are diagrams for explaining the piezoelectric piston according to the first embodiment of the present invention. Specifically, Figure 3 is a view showing a piezoelectric piston according to a first embodiment of the present invention, Figure 3 (a) is a view of the piezoelectric piston from the front of the fluid cylinder, Figure 3 (b) is a piezoelectric piston Figure is a schematic cross-sectional view of. 4 is a view showing the overall circuit configuration of a self-powered mat including a piezoelectric piston according to a first embodiment of the present invention.

3 and 4, the piezoelectric piston 140 according to the first embodiment of the present invention includes a piezoelectric element 141, a reciprocating rod 142, and a rectifier circuit chip 143.

The piezoelectric element 141 forms a plate-shaped perforated center, and a plurality of piezoelectric elements 141 are fixed to the fluid cylinder 130 at intervals in the front-rear direction. The piezoelectric material used in the piezoelectric element 141 is a piezoelectric material of a flexible material that generates electrical energy by a change in shape. A single layer piezoelectric material mixed with &quot; polyvinylidene fluoride &quot;) is used.

PZT and PVDF are both piezoelectric effects, PZT is a curable piezoelectric ceramic, and PVDF is a flexible piezoelectric polymer material. PZT has the disadvantage of generating electromotive force only above a certain pressure because the electromotive force of electric energy depends only on the magnitude of the force in the direction in which pressure is applied, but PZT has a relatively large electromotive force compared to PVDF for the same pressure. Has the advantage of generating electrical energy. PVDF has the disadvantage of generating electrical energy of relatively small electromotive force compared to PZT for the same pressure, but because of its flexibility, it has the advantage of generating electrical energy by deforming in all directions even at a minute pressure.

In the piezoelectric body according to the first embodiment of the present invention, by mixing the two materials, it is possible to generate electromotive force even at a minute pressure by removing the curability, and can sufficiently overcome the electrical energy generation efficiency of PVDF only through the mixed PZT. Thus, in the first embodiment of the present invention, the energy conversion efficiency of the self-powered mat can be further improved. The piezoelectric material is produced by mixing and melting PZT powder and PVDF powder, and then plastically processing the mixed piezoelectric material of a single layer obtained by polarization treatment as necessary, such as shape and thickness.

On the other hand, the piezoelectric element 141 uses the piezoelectric material as described above, and an electrode made of a conductive material such as silver (Ag) is coated on each of the upper and lower surfaces of the plate-shaped piezoelectric body in a thick film shape. The electrode outputs electrical energy generated when the piezoelectric element is deformed by an external force to the outside of the piezoelectric element 141. In addition, the piezoelectric element 141 is coated with a polymer protective film to insulate and protect the piezoelectric body and the electrode from the outside. Preferably, by using PVDF as the material of the polymer protective film, the bonding degree with the piezoelectric body can be increased.

The reciprocating rod 142 is formed on the outer circumferential surface of the plurality of protrusion plates 144 at intervals in the front and rear direction, and the rear end of the reciprocating rod 142 receives the fluid pressure to move the reciprocating rod 142. The fluid pressure plate 145 is formed. The reciprocating rod 142 reciprocates the punctured center portion of the piezoelectric element 141, wherein the protrusion plate 144 of the reciprocating rod 142 contacts the piezoelectric element 141 to deform the piezoelectric element 141.

Specifically, when the reciprocating rod 142 moves forward of the fluid cylinder 130, one protrusion plate 144 hits the central portion of one piezoelectric element 141, the protrusion plate 144 forward As it moves, the flexible piezoelectric element 141 is bent forward. After the piezoelectric element 141 is sufficiently bent and separated from each other, the piezoelectric element 141 vibrates back and forth by elasticity, and the protruding plate 144 continues to move forward to collide with the next piezoelectric element 141. As a result, as the reciprocating rod 142 moves forward of the fluid cylinder 130, each of the protrusion plates 144 comes into contact with all of the plurality of piezoelectric elements 141, and each of the plurality of piezoelectric elements 141 continues. As it bends and vibrates, its shape continuously deforms.

In addition, when the reciprocating rod 142 moves to the rear of the fluid cylinder 130, one protrusion plate 144 hits the central portion of one piezoelectric element 141, the protrusion plate 144 moves backward As such, the flexible piezoelectric element 141 is bent backwards. After the piezoelectric element 141 is sufficiently bent and separated from each other, the piezoelectric element 141 vibrates back and forth by elasticity, and the protruding plate 144 continues to move backward to collide with the next piezoelectric element 141. . As a result, as the reciprocating rod 142 moves to the rear of the fluid cylinder 130, each of the protrusion plates 144 comes into contact with all of the plurality of piezoelectric elements 141, and each of the plurality of piezoelectric elements 141 continues. As it bends and vibrates, its shape continuously deforms. Therefore, the piezoelectric piston 140 continuously improves the energy conversion efficiency of the self-powered mat by continuously deforming the piezoelectric element 141 in a reciprocating motion.

On the other hand, the length from the center to the end of the protruding plate 144 is the upper limit value that allows the piezoelectric piston 140 to move smoothly in the front and rear direction, and to bend in contact with the piezoelectric element 141 It is preferable to design the value as a lower limit.

The rectifier circuit chip 143 is a bridge rectifier circuit for rectifying alternating current into a direct current, and is formed as a chip on the outer periphery of the plate-shaped piezoelectric element 141 as shown in FIG. 141 is connected to each.

The piezoelectric element 141 generates electric energy having different polarities as the piezoelectric element 141 is bent in the front and rear directions, and thus the electromotive force of the electric energy output from the piezoelectric element 141 has an alternating voltage waveform alternating positive and negative. When synthesizing the electrical energy of an AC voltage waveform output from each of the plurality of piezoelectric elements 141 as it is, the electrical energy having a positive polarity and the electrical energy having a negative polarity cancel each other and are transmitted to the output terminal 150. There is a fear that the electromotive force of the electric energy is not sufficient.

Accordingly, in the first embodiment of the present invention, each of the plurality of rectifier circuit chips 143 is connected to each of the piezoelectric elements 141, so that the electrical energy output to the outside of the piezoelectric element 141 is of one polarity, preferably a positive amount. Rectify into a DC voltage waveform with only polarity. Thereafter, the electrical energy output from each of the rectifier circuit chips 143 is synthesized and output to the outside of the mat body 110 through the output terminal 150.

5 is a view for explaining the operating characteristics of the self-powered mat according to the first embodiment of the present invention. Specifically, FIG. 5A illustrates a state in which the elastic fluid bag 120 is contracted, and FIG. 5B illustrates a state in which the elastic fluid bag 120 is inflated. The main components of the self-powered mat not shown in FIG. 5 will be referred to FIGS. 1 to 4.

In FIG. 5, a time point at which the elastic fluid bag 120 starts to contract by applying an external force is set as a start time point of the cycle, and a time point at which the elastic fluid bag 120 is inflated as much as the external force is cut off as a completion point of the cycle. One cycle will be described.

First, as shown in FIG. 5A, when the elastic fluid bag 120 starts to contract, the fluid is discharged from the elastic fluid bag 120 through the inlet 121 of the elastic fluid bag 120. , And is sucked into the fluid cylinder 130 through the inlet 131 of the fluid cylinder 130 through the connection pipe 132. As the fluid is continuously sucked into the fluid cylinder 130, the fluid pressure toward the front increases relatively in the fluid cylinder 130, and the piezoelectric piston 140 moves forward to generate electric energy.

Next, as shown in (b) of FIG. 5, when the external force is blocked and begins to expand by the elasticity of the elastic fluid bag 120, the fluid flows through the inlet 131 of the fluid cylinder 130. Ejected from the 130, and is sucked into the elastic fluid bag 120 through the inlet 121 of the elastic fluid bag 120 through the connection pipe 132. As fluid is continuously sucked into the elastic fluid bag 120, the fluid pressure toward the rear in the fluid cylinder 130 increases relatively, and the piezoelectric piston 140 moves backward to generate electric energy.

This completes one cycle of generating electrical energy from the kinetic energy of the pedestrians.

Second Embodiment

6 is a view for explaining a self-powered mat according to a second embodiment of the present invention.

As shown in FIG. 6, the self-powered mat according to the second embodiment of the present invention includes a mat body 610, an elastic fluid bag 620, a fluid cylinder 630, a piezoelectric piston 640, and an output terminal 650. ) And a secondary battery 660.

The mat body 610, the elastic fluid bag 620, the fluid cylinder 630, the piezoelectric piston 640 and the output terminal 650 of the self-powered mat according to the second embodiment of the present invention, the first embodiment of the invention Since the mat body 110, the elastic fluid bag 120, the fluid cylinder 130, the piezoelectric piston 140 and the output terminal 150 of the self-powered mat according to the example has the same configuration, function and operation characteristics For a detailed description thereof, reference will be made to the first embodiment of the present invention described with reference to FIGS. 1 to 5, and will be omitted below.

The secondary battery 660 is a type of storage battery that converts electrical energy into chemical energy, stores it, and then regenerates it into electricity when needed. The secondary battery 660 is formed between the piezoelectric piston 640 and the output terminal 650 and stores electrical energy generated by the piezoelectric piston 640. Accordingly, in the second embodiment of the present invention, electrical energy can be stored and used when necessary. For example, if enough electrical energy is stored in the secondary battery 660 through walking, the electrical energy may be used even when the walking is not performed. In addition, even when the amount of electric energy generated by the external force during walking is not sufficient to be used, the electric energy previously charged through the secondary battery 660 may be used.

In addition, as a modification of the second embodiment of the present invention, the secondary battery 660 is formed to be detachable from the mat body 610. Accordingly, the secondary battery 660 may be separated from the mat body 610 at any time as needed, and coupled to the mat body 610. For example, when a plurality of secondary batteries 660 are provided and the secondary batteries 660 are fully charged by walking, the secondary batteries 660 may be replaced with other secondary batteries 660 to be charged. In addition, when it is difficult to directly connect the electrical device to use the electrical energy of the mat body 610 to the output terminal 650, the secondary battery 660 is separated from the mat body 610 and directly connected to the electrical device. Can be used. In addition, since the secondary battery 660 has compatibility with a shape, a voltage level, and a current level, the secondary battery 660 may be used as a rechargeable battery of electric devices.

As such, the self-powered mat according to the second embodiment of the present invention outputs and uses the electrical energy generated by converting kinetic energy such as walking through the piezoelectric piston 640 to the outside, without additional fuel and environmental pollution. The generated electrical energy can be used. Moreover, while fully performing a buffering effect etc., the energy conversion efficiency of a self-powered mat can be improved. In addition, it is possible to prevent the self-powered mat from being damaged by repeated external force. In addition, the production process of the self-powered mat can be simplified, and the production cost can be reduced.

As described above, it is to be understood that the technical structure of the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention.

Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the detailed description, and the meaning and scope of the claims and their All changes or modifications derived from an equivalent concept should be construed as being included in the scope of the present invention.

1 and 2 are views for explaining a self-powered mat according to a first embodiment of the present invention.

3 is a diagram illustrating a piezoelectric piston according to a first embodiment of the present invention.

4 is a view showing the overall circuit configuration of a self-powered mat including a piezoelectric piston according to a first embodiment of the present invention.

5 is a view for explaining the operating characteristics of the self-powered mat according to the first embodiment of the present invention.

6 is a view for explaining a self-powered mat according to a second embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

110, 610: mat body

120. 620: Elastic fluid bag

121, 131: doorway

130, 630: fluid cylinder

132 connector

140, 640: piezoelectric piston

141: piezoelectric element

142: reciprocating rod

143: rectifier circuit chip

144: protrusion plate

145: fluid pressure plate

150, 650: Output terminal

660: secondary battery

Claims (7)

Mat body; An elastic fluid bag formed on an upper portion of the mat body and repeating contraction and expansion by an external force; A fluid cylinder connected to the elastic fluid bag through a connection pipe and changing a pressure of an embedded fluid according to the contraction and expansion of the elastic fluid bag; A piezoelectric piston for generating electrical energy by deforming a plurality of plate-shaped piezoelectric elements in a reciprocating motion according to the pressure change of the fluid; And An output terminal connected to the piezoelectric piston and outputting the electrical energy to the outside of the mat body; Self-powered mat comprising a. The method of claim 1, In the mat body, And a plurality of power generation sets, wherein the elastic fluid bag, the fluid cylinder, and the piezoelectric piston are set as one power generation set. The method of claim 2, And the plurality of piezoelectric pistons are connected to the one output terminal. The method of claim 1, The piezoelectric piston, A plurality of plate-like piezoelectric elements fixed to the fluid cylinder at intervals and perforated in a central portion thereof; A plurality of protruding plates formed at intervals on an outer circumferential surface thereof, the reciprocating rods reciprocating the central portion of the piezoelectric element and deforming the piezoelectric element; And a rectifier circuit chip connected to each of the piezoelectric elements and rectifying the electrical energy. The method according to claim 1 or 4, The piezoelectric element is a self-powered mat, characterized in that using a single layer piezoelectric material mixed with PZT and PVDF. The method of claim 1, And a secondary battery formed between the piezoelectric piston and the output terminal and storing the electrical energy. The method of claim 6, The secondary battery is a self-powered mat, characterized in that detachable from the mat body.

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