KR102165356B1 - The portable generator for using piezoelectric film - Google Patents

Abstract

The present invention relates to a portable generator using a piezoelectric film. The portable generator according to an embodiment of the present invention is configured in the form of an enclosure including a piezoelectric film generating electricity due to vibration of an external force and a mass having a separate configuration for applying vibration to the piezoelectric film. In addition, a guide groove or a guide structure in a certain shape is provided on the inner surface of the enclosure so that the piezoelectric film is guided and supported by a closed loop, and the separate mass body prevents vibration generated by the user's movement. It characterized in that it is configured to be smoothly transmitted to the piezoelectric film.

Description

Portable generator using piezoelectric film {THE PORTABLE GENERATOR FOR USING PIEZOELECTRIC FILM}

The present invention relates to a portable generator using a piezoelectric phenomenon, and more particularly, by using a piezoelectric effect, which is a phenomenon in which voltage is generated by applying a physical force to a piezoelectric material having a film structure, the mechanical vibration generated from the outside is effectively generated and power generation. It relates to a portable generator configured to increase efficiency.

With the development of information and communication technology, mobile communication devices or portable terminals are widely used, and most of these devices are configured to receive power from batteries or rechargeable batteries. At this time, in the case of using a rechargeable battery as a power supply means, power to charge the rechargeable battery is required.If the power line is close, there is no difficulty in charging the rechargeable battery, but there is a problem that the rechargeable battery cannot be charged 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 separate power include a method of using a piezoelectric material and a method of using a magnet and a coil. The method of using a magnet and a coil requires a lot of power to rotate a magnet or coil. In the past, the development of generators that generate electricity using piezoelectric materials is gradually being activated.

Currently, a method of converting electrical energy into electrical energy using mechanical vibration energy indoors/outdoors includes a method of using an electrostatic, electromagnetic, piezoelectric effect, and the like. Piezoelectric energy using the piezoelectric effect, which is a phenomenon in which voltage is generated when a force is applied to a material, can be used as an alternative energy source suitable for various sensors and wireless mobile small electronic devices with the advantage of high conversion efficiency, small size, and light weight. In general, when a force is applied from the outside in a specific direction, a positive (+) charge on one electrode and a negative (-) charge on the other electrode are induced in response to the stress generated inside the piezoelectric body, thereby generating a voltage between both electrodes. Is called the piezoelectric static effect. On the contrary, when a voltage is applied to the piezoelectric body from the outside, the piezoelectric body causes mechanical distortion, which is referred to as an inverse piezoelectric effect.

In other words, piezoelectric material converts mechanical force (stress) into electrical signal (voltage) or electrical signal into mechanical force. Piezoelectric ceramics are used as a material having such a property. Power generation devices that generate electricity by using have been developed in various structures, and among conventional power generation devices using piezoelectric elements, cantilever-type energy harvesters are widely used. In a general structure of a cantilever-type generator, one end of the cantilever is fixed, one end of a leaf spring is fixed on an upper portion of the cantilever, and a piezoelectric element may be disposed on the upper portion of the leaf spring.

On the other hand, when the vibration is transmitted to the cantilever and the leaf spring to generate a displacement difference, the piezoelectric element attached to the leaf spring is also displaced, resulting in a piezoelectric effect in which the potential difference appears. However, the conventional power generation device configured as described above has the disadvantage that when the piezoelectric material generating the voltage is made of ceramic material, it is easily damaged by external shock and is easily damaged even when bending is repeated, and power generation efficiency is increased. In order to achieve this, the piezoelectric ceramic must be able to move for a long time with a large amplitude by using the resonance phenomenon.Since the natural frequency of the ceramic material is generally high, there is a limit to increase the power generation efficiency, and in the case of a cantilever type power generation device, the frequency of the vibration source of the cantilever There is a disadvantage in that a rapid change in output characteristics may occur according to the change, and a cantilever structure corresponding thereto is separately required.

Korean Patent Registration No. 10-1826173

The present invention is invented to solve the above problems, and it is an object of the present invention to provide a portable generator that is not easily damaged when an external impact or external force is applied, and that a piezoelectric material can easily perform resonant motion.

The present invention includes a piezoelectric film that is connected to one end of a lead wire and vibrates when an external force is applied and generates electricity due to the vibration, a mass that applies vibration to the piezoelectric film, the piezoelectric film, and the mass body, wherein the piezoelectric film is It consists of an enclosure including a guide groove so as to be guided and maintained in a certain shape.

In the portable generator according to another embodiment of the present invention, a lead wire is connected to one end and vibrates when an external force is applied, and a piezoelectric film generating electricity due to the vibration, and a mass body and an upper part of a separate configuration for applying vibration to the piezoelectric film are opened. And an enclosure including the piezoelectric film and the mass body therein, and having a guide groove formed on an inner bottom surface so that the piezoelectric film is inserted and guided in a uniform fence shape as a whole, and a cover for opening and closing the upper portion of the enclosure.
Another embodiment of the present invention is an enclosure in which a guide groove or a guide structure is formed on at least one side of an inner surface in order to support a component accommodated therein to be maintained in a certain shape, and the enclosure moves according to the movement of the enclosure, and separates within the enclosure. A lead wire is connected to the configured mass body and one end thereof, and is configured in a uniform fence shape so as to accommodate the mass body therein, vibrates when an external force is applied, and is composed of a piezoelectric film that generates electricity due to the vibration.
The guide structure includes a plurality of protrusions formed on one or more surfaces of the enclosure, and the positions of the protrusions are supported on both sides of the mounted piezoelectric film.

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The mass body is composed of one or more, operates within a certain shape of the piezoelectric film, and is composed of a coin-shaped magnet having a certain thickness, and is configured such that repulsive forces are applied between the magnets when there are a plurality of mass bodies.

The diameter of the mass is configured to be greater than the height of the interior of the enclosure.

The mass body includes a magnet inside, and the outside is configured in the form of a convex lens.

The guide groove is formed on one side of the enclosure, and has a depth of about 1/4 of the height of the piezoelectric film.

The mass is composed of a plurality of, but the material is not the same.

The mass body is formed in the form of a magnetic disk having one or more protrusions on the rim, and a plurality of protrusions to reduce friction are formed on a surface in contact with the bottom surface of the enclosure.

In addition, a cover portion for opening and closing the enclosure is provided on the upper portion of the enclosure.

The outside of the mass is configured to have one or more protrusions on the rim in a convex lens shape using an injection material, and the inside is configured to include a magnet.

The portable generator according to the present invention can generate electricity even without using separate power or power, and the piezoelectric film resonates to significantly increase power generation efficiency, and even when a large impact or external force is applied or the vibration period is accumulated, the piezoelectric material It has the advantage of not being damaged.

In addition, the portable generator according to the present invention has the advantage of maintaining high power generation efficiency because piezoelectric film resonance is easily induced by appropriately adjusting the natural frequency of the piezoelectric film if only the mass is replaced according to various conditions.
In addition, since the mass body moves within a certain fence of the piezoelectric film, all possible movements of the mass body lead to collisions with the piezoelectric film, thereby maximizing power generation efficiency.

The effects according to the present invention are not limited by the contents illustrated above, and more various effects are included in the present specification. Other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view showing a conventional cantilever type generator.
2 is an overall perspective view of the power generation device according to the present invention.
3A is a perspective view showing a piezoelectric film according to the present invention.
3B is a perspective view showing a piezoelectric film according to another embodiment of the present invention.
Figure 4a is a cross-sectional view of a power generation device configured with a guide groove according to the present invention.
FIG. 4B is a cross-sectional view of the power generation device in which the bottom surface of FIG. 4A is protruded.
5A is a cross-sectional view of a power generation device having a guide structure formed in the present invention.
5B is a cross-sectional view of the power generation device in which the bottom surface of FIG. 5A is protruded.
6A is a cross-sectional view of a mass body in which a magnet is configured according to the present invention.
6B is a perspective view of mass bodies in which a magnet is configured according to the present invention.

Hereinafter, a preferred embodiment of the portable generator according to the present invention will be described with reference to the accompanying drawings. For reference, in the following description of the present invention, each term is named in consideration of the function of each component, and thus, should not be understood as limiting the technical components of the present invention. In addition, embodiments described in the present specification will be described with reference to sectional views or schematic diagrams, which are ideal exemplary diagrams of the present invention. Accordingly, the form of the exemplary diagram may be modified by a drafting technique or a tolerance. In addition, in each of the drawings shown in the present invention, each component may be somewhat enlarged or reduced in consideration of convenience of description. The same reference numerals refer to the same components throughout the specification.

In Fig. 1, reference numeral 110 denotes a case, 111 denotes a bottom plate, 112 denotes a wall surface, 120 denotes a fixing member, 121 denotes a cantilever, and 122 denotes a piezoelectric element.

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On the other hand, referring to FIG. 2, the portable generator using the piezoelectric film of the present invention includes a piezoelectric film 100, a lead wire 50, a pair of magnets 210 and 220 of the mass body 200, an enclosure 300, and a guide groove. 350, including a cover 400.

The present invention is a configuration in which resonance is generated by vibration due to an impact between masses in the enclosure and the piezoelectric film generated when a user walks while holding the enclosure. At this time, when resonance occurs in the piezoelectric film, the piezoelectric film As the amplitude of the piezoelectric film increases and the vibration time of the piezoelectric film increases, the electricity generation efficiency is remarkably improved.

3A and 3B, the piezoelectric film has a piezoelectric polymer composed of polyvinylidene fluoride as a main element, and has the form of a composite film covered with a thin polyurethane layer and a polyester layer on both sides of the piezoelectric polymer, respectively. . Such piezoelectric films are widely used in various fields such as acoustic fields, and detailed descriptions thereof will be omitted.

At this time, the polymer-based piezoelectric film included in the present invention is very flexible or elastic.

Because it is large, it can be easily bent even with a small force. Therefore, the portable generator according to the present invention has the advantage that the piezoelectric film 100 is not damaged even when an external shock is applied or the vibration of the piezoelectric film 100 continues for a long time.

In addition, even if the user does not apply a separate force to bend the piezoelectric film 100 and wears a portable generator in a waistband, attaches it to a smartphone or a portable fan to carry it, or puts it in a bag and only walks, the piezoelectric film 100 Movement of the mass bodies 200 occurs due to the vibration generated during walking of the mass body 200, and the mass bodies 200 continue to collide with the piezoelectric film 100 due to the movement, causing vibration to the piezoelectric film 100 to cause electricity. Can be generated.

Therefore, the use of the portable generator according to the present invention has the advantage of being able to easily and continuously charge various mobile communication devices or portable terminals without a separate charging operation.

In this case, as the piezoelectric film 100 is longer and thinner, elastic vibration can be easily generated even with a small force, and the length and thickness of the piezoelectric film 100 can be freely changed according to the use.

The lead wire 50 is electrically connected to the piezoelectric film 100 to transmit electricity generated in the piezoelectric film 100 to the outside.

On the other hand, referring to FIG. 3B, a part of the edge portions W1 and W2 on both sides of the piezoelectric film 100 is faced (see FIG. 3B such as 150, 151, 152, etc.) In order to induce more vibration in the piezoelectric film 100 due to the mass body 200 when the piezoelectric film 100 is inserted or guided in the guide groove 350 or the guide structure 700 Can be configured.

Meanwhile, referring to FIGS. 4A and 4B, the piezoelectric film 100 includes a guide provided on a portion of the bottom surface 310 and the upper surface of the enclosure 300 (one side of the cover: 410 in the case of a separate cover). The depth d inserted into the grooves 350 and 450 is configured such that only about ¼ of the height H of the piezoelectric film 100 is inserted into each of the guide grooves 350. The guide groove 350 is configured such that the piezoelectric film 100 does not deviate even if the mass bodies 200 are elastically repelled by impacts of each other within the enclosure 300.

In addition, the width of the guide groove is sufficient if the piezoelectric film 100 is sufficiently spaced within the guide groove when the piezoelectric film 100 is inserted.

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In addition, a plurality of protrusions 315 are formed on both sides of the guide groove 350, so that when the mass body 200 exerts an impact on the piezoelectric film 100, the elastic force of the piezoelectric film 100 causes the The piezoelectric film 100 moves left and right, and the number of vibrations is caused by causing a secondary bump of the piezoelectric film 100 to a plurality of guide groove protrusions 315, 316... formed in the guide groove 350 It is configured to increase

In addition, as a further embodiment of the present invention with reference to FIG. 5, the piezoelectric film 100 is a fence having a constant shape instead of the guide groove 350 of the enclosure 300 into which the piezoelectric film 100 is inserted. In order to prevent mass bodies from leaving the piezoelectric film, a terminal is formed at one end of the piezoelectric film, rather than a closed loop or a completely closed loop, so that the masses do not leave the space within the piezoelectric film. To form a piezoelectric film strip), guide structures 700, 730, and 750 having a small height on the bottom surface 310 of the enclosure 300 are provided as a guide wall 730 extending to a predetermined height. It can be installed on both sides of the film 100, and as another configuration of the guide structure 700, a plurality of guide protrusions (750, 751, 752, etc.) are sparsely installed to replace the guide wall 730. , The piezoelectric film 100 is configured to guide and support the mass bodies 200 inside the enclosure 300. Meanwhile, referring to FIGS. 4A and 6A, the inner height CH of the enclosure 300 in the structure inside the enclosure 300 is, if possible, a convex lens shape in which the mass body 200 accommodates a magnet. In the case of plural numbers, the size of the convex lens diameter D is larger than the height CH of the enclosure 300 (D>CH). The reason is that when vibration occurs in the enclosure 300, the magnets are configured in the enclosure 300 so that a repulsive force acts between the magnets in order to increase the magnitude of the vibration. Due to the vibration of the enclosure 300, the magnets always attract each other. This is to block structural problems that try to change the position in the direction it is intended to act. That is, the height CH in the enclosure 300 must be smaller than the diameter D of the magnet mass 200 so that the mass body 200 is not turned over.

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The diameter (D) of the magnet mass body 200 may be different from each other, but for the same reason, each diameter (D) is configured to be larger than the height (CH) in the enclosure (300).

As mentioned above, at least one mass body 200 is included so as to cause resonance in the piezoelectric film 100 inside the enclosure 300 according to various external conditions. As the mass body 200, a plurality of magnets mentioned above may be used, and the magnets are configured to exert a repulsive force between each other so that the increased pressure on the piezoelectric film 100 by the shaking (vibration) of the enclosure 300 is applied. The movement of the mass bodies 200 is caused by vibrations generated when the user carries the device to which the present technology is applied, and thus, the mass bodies 200 collide with the piezoelectric film 100 to generate resonance. will be.
Since the mass bodies exist in a piezoelectric film composed of a uniform fence shape or a closed loop shape as a whole, the mass bodies can collide with the piezoelectric film in any direction in all directions, so that the movement of the mass body is almost 100%. It is formed by a configuration that is transmitted to. The piezoelectric film is configured as a closed loop in an overall shape because the mass bodies need only be configured so that the piezoelectric film does not deviate from an oval shape or a fence shape in which a part of the piezoelectric film is cut. In the above description, the term "overall" is an expression that can be replaced with the term "approximate", and in addition, a certain shape of the piezoelectric film mentioned in the present invention is partially open in the shape of the ring or closed loop. May be in the shape of a complete ring or a closed loop, and include an incomplete ring that is partially unconnected or a shape of a Perupe whose part is cut off. That is, the Perupra having a constant shape of the piezoelectric film mentioned in the present invention means that it does not matter whether it is a circle, an ellipse or a polygon, as long as the mass body moving in the piezoelectric film does not deviate from the piezoelectric film. Even if it does, it is sufficient if the masses are not separated from within the piezoelectric film.

On the other hand, in order to allow the repulsive force to act between the magnets, the piezoelectric film 100 is positioned within the fence (closed loop formation) so as to have the same polarity, so that when the user moves, the mass body 200 is fenced according to the movement. Since the piezoelectric film 100 has a role of increasing vibration by repelling each other while moving within the piezoelectric film configured in a shape, a magnetic object can be used as a mass.

Although a magnet is mentioned as an example of the mass body mentioned above, it may be a mass body composed of a general material without a magnetic component. For example, in the case of three mass bodies, one may be formed of an extruded product 210, the other may be formed of a metallic coin shape, and the other may be configured to have a coin shape having a certain weight as a wood component.

In addition, the appearance of the mass body is composed of a ball-shaped sphere instead of the coin shape, and it can be manufactured and utilized as a material that generates elasticity when colliding with each other.

That is, any material moving in the piezoelectric film 100 configured in the shape of the fence may be composed of the mass body 200 so that the movement of the mass body is transmitted to the user's senses. B. It can be used as a means to convey the feeling to the user that it is charged by being expressed as a silent vibration.

In addition, the appearance of the mass body 200 is a certain protrusion on the exterior or rim of the mass body so that friction with the bottom surface 310 or the upper surface 410 of the enclosure 300 when moving within the enclosure 300 is reduced. , Make both sides convex. In addition, the inner part is composed of a magnet and the outer part is made of a convex injection product, so that the mass body 200 is configured to reduce friction when the mass body 200 moves or vibrates inside the enclosure 200.

4B and 5B, the center of the bottom surface 310 of the enclosure 300 is formed to be convex slightly above the bottom surface 310 into which the piezoelectric film 100 is inserted, so that the mass bodies 200 are particularly This is to minimize the location in the center of the bottom surface 310 and to have a collision with the piezoelectric film 100 as much as possible when configured in a spherical shape.

On the other hand, the enclosure 300 may be configured separately with a cover 400 partially opened. In this configuration, the guide groove 350 or the guide structure 700 is also configured on the bottom surface 310 of the enclosure 300, and the cover 400 also includes the guide groove 350 or the guide structure 700. ) Corresponding to the same or similar shape guide groove or guide structure 700 is configured, and when the enclosure 300 and the cover 400 are combined, the piezoelectric film 100 is constant within the enclosure 300 It will be able to be kept guided.

That is, the piezoelectric film 100 is formed in a strip shape having a certain thickness, and one edge W1 is configured to be inserted and supported by the circular guide groove 350 formed on the bottom surface 310 of the enclosure 300, The other side edge W2 of the piezoelectric film 100 is configured to be guided and supported by a cover guide groove 450 formed in the cover 400 or a cover guide structure 750.

Meanwhile, with reference to FIG. 3B, the piezoelectric film 100 as another embodiment may cause more vibrations in the piezoelectric film by chamfering (150, 151, 152, etc.) some of the edge portions W1 and W2 on both sides. May be.

In the above, the present invention has been illustrated and described with respect to specific embodiments, but the present invention is not limited to the above-described embodiments, and those of ordinary skill in the art to which the present invention pertains are described in the following claims. It will be possible to implement it with any number of various changes without departing from the gist of the technical idea of the present invention.

50: lead wire 100: piezoelectric film
150 (151 ~ 155): face picking 200: mass
210, 220: magnet 250: injection structure
300: enclosure 310: bottom surface
315: guide groove protrusion 330: upper surface
350: guide groove 400: cover
450: cover guide groove 715: guide protrusion
700: guide structure (the cover has the same structure)

Claims (14)

A piezoelectric film formed in a band shape having a predetermined width and length, a lead wire connected to one end, vibrating when an external force is applied, and generating electricity due to the vibration;
A space capable of accommodating the piezoelectric film is provided, and the piezoelectric film is bent in the space to form a predetermined fence shape while maintaining the fence shape while the piezoelectric film vibrates by an impact caused by an external force. An enclosure in which a guide groove is formed;
A mass body disposed in a fence-shaped interior formed by the piezoelectric film and an inner space formed by the inner surface of the enclosure, and configured to freely move within the inner space as the enclosure vibrates to apply an impact to the piezoelectric film Including,
At least two of the mass bodies are provided, and each of the mass bodies includes a magnet with magnetic poles formed so that repulsive forces always act on each other even while the mass bodies move freely within the inner space. The method of claim 1,
The guide groove includes at least one of a groove shape recessed in the inner surface of the enclosure or a shape protruding from the inner surface of the enclosure,
In addition, the guide groove is a portable power generation apparatus, characterized in that to provide a clearance through which the piezoelectric film can vibrate by the impact of the mass body. delete delete The method of claim 1,
The fence shape is a closed loop shape or a fence shape in which a part is cut off-the cut part is formed to a size such that the mass does not exit the inner space-a portable power generation device, characterized in that. The method of claim 2,
The protruding form is a plurality of protrusions or guide walls configured on an arbitrary surface of the enclosure,
The plurality of protrusions are located on both sides of the piezoelectric film to maintain the shape of the fence of the piezoelectric film, or,
And the guide wall guides and supports the entire lengthwise direction of the piezoelectric film. The method of claim 1,
The mass body or the magnet is a portable power generation device, characterized in that configured in the form of a coin having a predetermined thickness. The method of claim 7,
The portable power generation device, characterized in that the diameter (D) of the mass is configured to be larger than the height (CH) of the inner space inside the enclosure. The method of claim 1,
The mass body is a portable power generation device, characterized in that the shape of a convex lens. The method of claim 1,
The portable power generation apparatus, characterized in that the central portion of the bottom surface of the inner space inside the enclosure is configured to be more convex than the portion where the piezoelectric film is located. delete The method of claim 1,
The piezoelectric film is a portable power generation device, characterized in that a part of the surface is formed on at least one of both side surfaces (W1, W2) along the longitudinal direction. A piezoelectric film formed in a band shape having a predetermined width and length, a lead wire connected to one end, vibrating when an external force is applied, and generating electricity due to the vibration;
A space capable of accommodating the piezoelectric film is provided, and the piezoelectric film is bent in the space to form a predetermined fence shape while maintaining the fence shape while the piezoelectric film vibrates by an impact caused by an external force. An enclosure in which a guide groove is formed;
A mass body disposed in a fence-shaped interior formed by the piezoelectric film and an inner space formed by the inner surface of the enclosure, and configured to freely move within the inner space as the enclosure vibrates to apply an impact to the piezoelectric film Including,
At least two mass bodies are provided, and at least one of the mass bodies is formed of an elastic material so that the mass bodies move freely within the inner space and are configured to repel each other by an elastic force when colliding with each other,
All or part of the mass bodies are made of different materials. delete

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