TWI439039B - Piezoelectric power generator module - Google Patents

Description

Piezoelectric power module

The invention relates to a piezoelectric power generation module, in particular to a flat type piezoelectric power generation module, which can be applied to the field of multi-layer surfaces.

With the rising oil prices, renewable or clean energy has become a new energy development direction, with solar energy, wind energy and biomass energy technology development as the mainstay, and solar energy industry developing the fastest. Only the existing renewable energy development suffers from the high cost of raw materials and manufacturing, which leads to the inability to survive under the subsidy of non-government subsidies. How to reduce the power generation cost of renewable energy has always been the focus of technology development in related industries. Mechanical energy is a worthwhile energy source. It always exists in the global environment. For example, wind power and wave changes are one of the sources of potential development of mechanical energy. In addition, any moving object will also have mechanical energy, so the mechanical energy is the energy that exists everywhere on the earth. However, the form of mechanical energy has changed considerably over time, and it is difficult to obtain a stable source of mechanical energy.

Regarding the utilization of mechanical energy, there is currently a piezoelectric piece of a cantilever structure in which the cantilever is fixed to a wall surface which does not move, and mechanical energy is transmitted to the piezoelectric piece through the wall surface. Please refer to the patent: JP11146663, JP2003061367, that is, the piezoelectric piece is attached to the cantilever to form a piezoelectric generator, and the cantilever structure is used to generate mechanical vibration, and the piezoelectric piece is compressed or stretched to generate a voltage. The WO0120760 patent also discloses the attachment of a piezoelectric sheet to a micromachined cantilever. In addition, as in the patent JP9205781, US5751091, JP2004222414 and the like using a similar cantilever structure, a piezoelectric sheet of a multilayer structure is also used to increase the generated electric energy.

Patents WO2004030949, EP1762403, MXPA05003441, WO2006009775, US2005280334, US2004108724, US6909224, US6655035, US6194815, etc. disclose mechanical forces for non-linear motion, and mechanical structures can also be designed to convert the direction of the force force to continuously act on the piezoelectric sheet to generate voltage, such as The actuator that uses the torque caused by the rotation converts the rotational kinetic energy into a force that causes the piezoelectric sheet to undergo continuous bending deformation to generate an output of the voltage.

Patents WO9625769, US5578889, US5548177, JP2001180575, etc. disclose fluid kinetic energy for water flow, through the floating up and down of the buoy as a mechanical energy transfer structure, for example, a voltage output due to deformation of the wobble guided piezoelectric piece of the buoy structure.

Patent No. 6,424,079 discloses the use of a linear structure that is mechanically driven to the piezoelectric sheet by the twisting of the fluid, such as to produce a voltage output.

Patent JP2003152238 and US2005225207, using a strip-shaped laminated piezoelectric sheet structure, through the pressure generated by the rolling cylinder, is subjected to continuous pressure to generate a voltage output, wherein a plurality of piezoelectric sheets are attached to the elastic tape. A continuous voltage output is produced when the roller rotates.

Patent JP2002218769, US20030146676, AU6020101, etc. disclose the use of a soft substrate to deform the substrate by an external force, resulting in deformation of the attached piezoelectric sheet to produce a voltage output.

The patents JP2003315363, JP2001339963, JP7245970, etc. disclose a plurality of piezoelectric sheets which are attached or stacked to increase the power output, such as forming a series-parallel circuit connection to the piezoelectric sheets through the metal sheets and the wiring to provide a large voltage or current output.

The invention provides a piezoelectric power generation module, comprising: an upper cover; a lower cover; an electromechanical conversion unit, wherein the electromechanical conversion unit is a metal piece, the metal piece is attached with a plurality of piezoelectric pieces, and the electromechanical conversion unit is electrically connected. An output end; an air cushion disposed under the piezoelectric sheets to provide the piezoelectric sheet deformation space; and a plurality of protrusions fixed on the inner surface of the upper cover and disposed above the piezoelectric sheets, each The contact area of the force receiving end of a protrusion is greater than the contact area applied to the piezoelectric piece to achieve the effect of pressure amplification when the piezoelectric power generation module receives an external force.

Among them, the air cushion material is selected from one of rubber, silicone or plastic. The piezoelectric power generation module of the present invention may include a plurality of air cushions, which are spherical air cushions. Moreover, the lower cover of the piezoelectric power generation module has a recess for receiving the spherical air cushion and the electromechanical conversion unit. Further, the shape of the protrusion may be a cone, a column or a half sphere, wherein the protrusion is preferably a rigid material having a stiffness coefficient of about 0.7 or more.

The piezoelectric power generation module of the present invention may also be a flat plate type, and the upper cover and the lower cover are made of an elastic material, and a rubber or plastic material which can be flexibly arbitrarily is selected, so that the piezoelectric power generation module can be subjected to any deflection and rod. Press, pinch or tap to output current.

The flat type piezoelectric power generation module of the present invention further comprises a plurality of electromechanical conversion units, which are selected to be connected to each other in a series connection, a parallel connection, and any combination thereof.

The flat-plate piezoelectric power generation module further includes a rectifier, and the rectifier is electrically connected to the output end, so that the electric energy generated by the piezoelectric piece is output to the rectifier. The flat-plate piezoelectric power generation module of the present invention further includes a charging device, and the rectifier is electrically connected to the charging device to store the rectified direct current to the charging device.

The output end can also be electrically connected to a load circuit, so that the electromechanical conversion unit can supply current to the load circuit after being output to the rectifier by the electric energy generated by the external force.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

In order to make the above-mentioned objects, features and advantages of the present invention more comprehensible, the piezoelectric power generation module according to the present invention will be described in detail with reference to the accompanying drawings. The components will be described with the same component symbols.

The piezoelectric power generation module 1 of the present invention does not use a cantilever structure to compress or stretch a piezoelectric piece, but develops another new structure to deform a piezoelectric piece in a piezoelectric power generation module to output a current. . 1A to 1C are schematic cross-sectional, front and front cross-sectional views of a piezoelectric power module according to an embodiment of the present invention. The piezoelectric power generation module 1 includes an upper cover 10, a lower cover 11, an electromechanical conversion unit 12, an air cushion 13, and a plurality of protrusions 14.

The piezoelectric power generation module 1 of the embodiment of the present invention is a flat piezoelectric power generation module, and the upper cover 10 and the lower cover 11 are made of an elastic material, and a rubber or plastic material that can be flexibly arbitrarily selected, such as silicone rubber, Polymers such as latex and polyurethane (PU) enable the flat-plate piezoelectric power module to output current by any deflection, bar pressure, rolling or tapping. The structure and principle will be detailed later. Said.

Please refer to FIG. 2, which is a schematic diagram of the electromechanical conversion unit 12 of the present invention. The electromechanical conversion unit 12 includes a metal piece 120 having a plurality of piezoelectric sheets 122 attached to at least one side thereof. The electromechanical conversion unit 12 is electrically coupled to an output end 123 for outputting electrical energy generated after the piezoelectric sheet 122 is deformed. In the embodiment of the present invention, in order to increase the output electric energy, a plurality of piezoelectric sheets 122 are attached to the lower surface of the metal piece 120. In addition, the electromechanical conversion unit 12 of the present invention utilizes a circuit board 124, as shown in FIG. 2, to connect the piezoelectric sheets 122 in series or in parallel, and output currents generated by the deformation of the piezoelectric sheets to Output 123.

Another preferred embodiment of the present invention, as shown in Figures 3A through 3C, selectively uses a plurality of electronic components 125 to electrically connect the piezoelectric sheets 122, as shown in Figure 3A. The advantage of using the electronic component 125 is that the piezoelectric sheet has a large deformation space and improves the sensitivity of the piezoelectric conversion of the piezoelectric power generation module 1.

In addition, since the piezoelectric sheet 122 is generally made of a ceramic material, if the area of the piezoelectric sheet 122 is too large, it is easily broken when subjected to a flexing force, particularly in the present case, in order to make a flat type piezoelectric power generation. The module 1 can be as thin and light as possible, and at the same time, the piezoelectric sheet 122 can be protected from being broken by excessive external stress. In the embodiment of the present invention, the piezoelectric sheet 122 has an area of about 11 to 13 mm 2 and between each other. A predetermined distance apart. Moreover, each piezoelectric sheet 122 has an aspect ratio ranging from about 1 to 10 to facilitate bending of the piezoelectric sheet 122 to cause deformation.

Since the piezoelectric power generation module 1 of the embodiment of the present invention is of a flat type, in order to force the electromechanical conversion unit 12, the piezoelectric sheet 122 can generate sufficient deformation in a limited space, and the present invention is in the piezoelectric state. An air cushion 13 is disposed under the sheet 122 to provide a space in which the piezoelectric sheet 122 is deformed. In addition to this, it is also possible to protect the piezoelectric sheet 122 made of a ceramic material so that it is not easily broken due to excessive stress.

In the present embodiment, a plurality of air cushions 13 are used, and the air cushion 13 is an air cushion ball. Of course, in order to adjust the spring constant, the bubble rate inside the sphere can be controlled, or a hollow spherical shell can also be used. The shape of the air cushion 13 referred to herein is merely an embodiment for convenience of explanation, and it is not limited to the illustrated shape, and other shapes are also possible. A plurality of air cushions 13 are intended to generate a restoring force, and therefore, a small spring having elasticity is naturally one of the alternatives that can be selected. The lower cover 11 has a recess 110, and a plurality of spherical air cushions 13 are laid in the recess 110 of the lower cover 11, and the electromechanical conversion unit 12 is stacked on the air cushion 13. The material of the air cushion 13 is selected from one of rubber, silicone, foam, styrofoam or foamed plastic.

The plurality of protrusions 14 are disposed on the inner surface 101 of the upper cover 10, and when the upper cover 10 is coupled to the lower cover 11, the electromechanical conversion unit 12 is located between the protrusions 14 and the air cushion 13. When the piezoelectric power generation module 1 receives an external force, the protrusions 14 can simultaneously force the plurality of piezoelectric sheets 122 on the electromechanical conversion unit 12, and increase the pressure per unit area of each force point, so that the piezoelectric The sheet 122 simultaneously outputs electric energy, effectively improving the piezoelectric conversion efficiency. The protrusion 14 of the embodiment of the present invention is a cone with the apex facing downward, that is, the lower tip is flat, and of course, the tip is not too sharp. In the embodiment of the present invention, the tip of the cone has rounded corners or is set with small beads. Most preferably, the projections 14 are preferably made of a rigid material having a stiffness coefficient of greater than about 0.7. As shown in FIG. 1B and FIG. 1C, the protrusion 14 is characterized in that the upper surface area close to the upper cover 10 (ie, the force receiving end) is larger than the lower surface area applied to the contact point of the electromechanical conversion unit 12 to produce a pressure amplification effect. The larger the upper surface area/lower surface area ratio, the better the amplification effect. The protrusions 14 may be fixed to the inner surface 101 of the upper cover 10 in any conventionally fixed manner, or may be integrally formed with the upper cover 10.

In a preferred embodiment, the protrusion 14 may also be a three-quarter sphere or a semi-spherical sphere in an embodiment of the invention. However, as long as the upper surface area is larger than the lower surface area of the force contact point, it is not limited to The shape described in the embodiment of the present invention, of course, has the best effect when the protrusion 14 is a semi-spherical sphere, as shown in Fig. 4A. There is only one point of contact between each protrusion 14 and the piezoelectric piece 122. In addition to the effect of pressure amplification, since the shape is relatively round, the damage to the piezoelectric piece 122 is small when the upper cover is impacted by an external force. The service life of the piezoelectric power generation module of the present invention can be extended.

The protrusions 14 of the present invention can be selected to use a plurality of juxtaposed semi-cylinders, and the same effect can be achieved. Other shapes and variations that can be easily inferred by those of ordinary skill are also included in the scope of the present invention. One by one description.

On the other hand, the protrusions 14 are semi-spherical spheres, and the multilayer piezoelectric power generation modules can be vertically stacked to improve the efficiency of piezoelectric conversion per unit area, as shown in FIG. 4B. As long as a pad 19 is added between the upper and lower sets of electromechanical conversion units 12a and 12b, the material is like the upper cover 10 or the lower cover 11, and the rubber or plastic material can be arbitrarily flexed, for example, silicone, latex, PU, etc. Molecular polymer. The lower surface of the backing plate 19 also has a plurality of semi-spherical spherical protrusions 14, in addition to providing a deformation space of the upper piezoelectric sheet 122a, and also applying pressure to the lower piezoelectric sheet 122b to provide a pressure amplification effect.

The present invention has the advantage of using a plurality of protrusions 14 compared to a design using only a single protrusion, that is, for each stressed piezoelectric piece, the force-electric coupling relationship is still in the linearly varying region, so that the stress energy More efficient conversion to electrical energy output. Although the design of a single protrusion can increase the force per unit area, since the stress is concentrated on the same piezoelectric piece, the current output by the piezoelectric piece does not increase indefinitely as the amount of deformation increases. In the end, saturation will still be reached. At this time, even if the piezoelectric piece is continuously forced to deform, no more current can be supplied.

Of course, according to the actual application requirements and the size of the input mechanical energy, the number of the electromechanical conversion unit 12 and the piezoelectric sheet 122 and the arrangement of the electromechanical conversion unit 11 can be arbitrarily changed, and one of series, parallel, and any combination thereof can be selected. The ways are connected to each other to increase the power generated by the conversion. In the embodiment of the present invention, in order to enable the piezoelectric power generation module 1 to be applied outdoors or in a humid environment, the piezoelectric power generation module 1 further includes a waterproof film layer 15 for piezoelectric generation. The module 1 prevents moisture from penetrating and causes damage to the electromechanical conversion unit 12.

Please refer to FIG. 5 , which is a functional block diagram of the piezoelectric power generation module 1 of the present invention. The output end 123 can be electrically connected to a rectifier 16 to output the electrical energy generated by the piezoelectric sheets to the rectifier 16. The rectifier 16 can be reconnected to a charging device 17 to store the direct current output from the rectifier 16. The charging device 17 can be a capacitor or a rechargeable battery.

The output terminal 123 can also be electrically connected to a load circuit 18, such as a light-emitting element, so that the electrical energy generated by the external force is output to the rectifier 16 after the electromechanical conversion unit 12 is supplied to the load circuit 18.

The piezoelectric power generation module of the present invention has the following advantages:

(1) Using a gas cushion to provide a piezoelectric sheet deformation space, the piezoelectric power generation module of the present invention can cause the piezoelectric sheet to deform and output current within a limited space, compared with the piezoelectric sheet of the conventional cantilever structure. Therefore, the piezoelectric power generation module can be reduced in size or even prepared into a flat structure.

(2) By using a plurality of protrusions, a plurality of piezoelectric sheets can be simultaneously subjected to a force, and the pressure applied to the piezoelectric sheets can be amplified to achieve an effect of improving piezoelectric conversion efficiency.

(3) The structural design is flexible, and a plurality of electromechanical conversion units can be vertically stacked according to requirements to form a piezoelectric generating module of a multi-layer structure, thereby improving the efficiency of piezoelectric conversion per unit area.

(4) It is widely used, and the piezoelectric power generation module of the present invention can output electric energy regardless of any arbitrary deflection, bar pressure, rolling or tapping.

For example, when the design is a flat structure, the panel is enlarged and placed at a high position, and the two ends are fixed. The flat panel piezoelectric power generation module panel can be bent by the wind to deform the piezoelectric sheet to generate electric energy. After the waterproof film layer is coated, the flat type piezoelectric power generation module can also utilize tides to generate electric energy.

In addition, it can also be used for a floor or road surface with a large change in mechanical energy such as a traveling vehicle, and as a power generation floor or a power generation road used by a pedestrian or a traveling vehicle, the mechanical energy acting on the road surface by the traveling vehicle can be effectively recovered from the road surface.

In addition to the above-described application modes, the flat type piezoelectric power generation module of the present invention can be flexibly deformed to generate electric power, and the level and range of its application can be expanded.

The present invention has been described above by way of a preferred example, but it is not intended to limit the spirit of the invention and the inventive subject matter. Those who are familiar with the technology can easily understand and utilize other components or methods to produce the same effect. Modifications made without departing from the spirit and scope of the invention are intended to be included within the scope of the appended claims.

1. . . Piezoelectric power module

10. . . Upper cover

101. . . Inner surface of the upper cover

11. . . lower lid

110. . . Groove

12, 12a, 12b. . . Electromechanical conversion unit

120. . . Metal sheets

122. . . Piezoelectric sheet

123. . . Output

13. . . air cushion

124. . . Circuit board

125. . . Electronic component

14. . . Protrusion

122, 122a, 122b. . . Piezoelectric sheet

15. . . Waterproof membrane

16. . . Rectifier

17. . . Charging device

18. . . Load circuit

19. . . Pad

1A to 1C are schematic cross-sectional views showing a top view, a front view, and a right side view of a piezoelectric power generation module according to an embodiment of the present invention;

2 is a schematic view showing an electromechanical conversion unit according to an embodiment of the present invention;

3A to 3C are respectively a cross-sectional view showing a top view, a front view, and a right side view of a piezoelectric power generation module according to another embodiment of the present invention;

4A and 4B are schematic cross-sectional views showing a front view of a piezoelectric power generation module according to various embodiments of the present invention;

Fig. 5 is a block diagram showing the function of the piezoelectric power module of the present invention.

1‧‧‧Piezoelectric Power Module

10‧‧‧Upper cover

101‧‧‧The inner surface of the upper cover

11‧‧‧Under the cover

110‧‧‧ Groove

12‧‧‧Electromechanical Conversion Unit

122‧‧‧ Piezo Pieces

124‧‧‧Circuit board

13‧‧‧ air cushion

14‧‧‧Protrusions

15‧‧‧Waterproof membrane

120‧‧‧metal pieces

Claims (10)

A piezoelectric power generation module includes: an upper cover; a lower cover, providing an accommodating space, the upper cover covers the lower cover; an electromechanical conversion unit is located in the accommodating space of the lower cover, and the electromechanical conversion unit is a metal piece, the metal piece is affixed with a plurality of piezoelectric pieces, the electromechanical conversion unit is electrically connected to an output end; an air cushion is located at the bottom of the accommodating space of the lower cover, and is disposed under the piezoelectric pieces to Providing the piezoelectric sheet deformation space; and a plurality of protrusions fixed on the inner surface of the upper cover and disposed above the piezoelectric sheets, wherein the contact area of the force receiving end of each protrusion is greater than the force applied to the piezoelectric sheet The contact area is used to achieve a pressure amplification effect when the piezoelectric power generation module receives an external force. The piezoelectric power generation module according to claim 1, wherein the air cushion material is one selected from the group consisting of rubber, silicone, foam, styrofoam or foamed plastic. The piezoelectric power generation module of claim 2, wherein the piezoelectric power generation module further comprises a plurality of air cushions, wherein the air cushions are air cushion balls, and the lower cover has a groove for receiving the air cushions. Ball and the electromechanical conversion unit. The piezoelectric power generation module according to claim 1, wherein the piezoelectric sheets have an aspect ratio of 1:1 to 10:1, which is advantageous for bending and deforming the piezoelectric sheets. The piezoelectric power generation module according to claim 1, wherein the protrusions are shaped as a cone or a half sphere, wherein the protrusions are rigid materials having a stiffness coefficient of 0.7 or more. The piezoelectric power generation module according to claim 1, wherein the electromechanical conversion unit further comprises a circuit board or a plurality of electronic components, wherein the piezoelectric sheets are connected in series or in parallel, and the pressure is The current generated by the deformation of the chip is output to the output terminal. The piezoelectric power generation module of the first aspect of the invention, further comprising: a second electromechanical conversion unit, wherein the second electromechanical conversion unit is provided with a plurality of second piezoelectric sheets; a backing plate, the lower surface of the backing plate has a plurality of semi-circular spherical protrusions, the backing plate is disposed above the electromechanical conversion unit, and the second electromechanical conversion unit is placed above the backing plate, and when the upper cover is stressed, the backing plate The deformation spaces of the second piezoelectric sheets are provided, and the electromechanical conversion units are biased by the semi-spherical spherical protrusions while providing a pressure amplification effect. The piezoelectric power generation module according to claim 7, wherein the piezoelectric power generation module is a flat piezoelectric power generation module, and the upper cover, the lower cover and the back plate are made of an elastic material. The flat type piezoelectric power generation module can be subjected to arbitrary deflection, bar pressure, rolling or tapping to cause the piezoelectric power generation module to output current. The piezoelectric power generation module of claim 1, further comprising a rectifier, a capacitor or a rechargeable battery, the rectifier being electrically connected to the output end and the capacitor or the rechargeable battery to make the piezoelectric After the power generated by the chip is output to the rectifier, it is stored to the capacitor or the rechargeable battery is charged. The piezoelectric power generation module according to claim 1, wherein the output end is electrically connected to a load circuit, so that the electrical energy generated by the external force is output to the rectifier, and the current is supplied. The load circuit.