Piezoelectric ceramic power generation device and method

Abstract

The present invention relates to the technical field of piezoelectric ceramic power generation, and provides a piezoelectric ceramic power generation device and method. The device includes an elastic piezoelectric ceramic sheet, a driving mechanism and a conversion device. Specifically: when the driving mechanism is subjected to an external force, the driving mechanism transmits the external force to the conversion device; when the force applied to the conversion device is less than a first preset force, the conversion device does not act or deforms within a preset range; when the force applied to the conversion device is greater than the first preset force, the conversion device acts quickly and hits the elastic piezoelectric ceramic sheet, and the elastic piezoelectric ceramic sheet generates electrical energy. The present invention uses a conversion device with a first state and a second state, which plays a role in setting a driving threshold for the external force, and the corresponding rapid deformation speed will also be transferred to the elastic piezoelectric ceramic sheet, thereby generating a larger amount of power generation.

Description

[Technical field]

[0001] The present invention relates to the technical field of piezoelectric ceramic power generation, and in particular to a piezoelectric ceramic power generation device and method. [Background technology]

[0002] With the development of technology, more and more electronic products that need to use batteries have appeared on the market. However, waste batteries will cause serious pollution to the environment. Therefore, developing a new way to replace batteries has become an urgent need to protect the environment and human life and health.

[0003] Piezoelectric ceramic materials have a unique piezoelectric effect, which can convert mechanical energy into electrical energy. Under the influence of external vibration or impact, piezoelectric ceramics deform and output electric charge. Under the condition of continuous vibration, piezoelectric ceramics will also continuously output electrical energy. After many links such as energy conversion, rectification, energy storage, and power supply, it is applied to technology in life.

[0004] When piezoelectric ceramics are deformed, they generate an induced voltage and output energy to the load. The voltage or energy generated is affected by many factors: such as the size of the piezoelectric ceramic, the equivalent capacitance, the degree of deformation, the deformation speed, etc. Generally speaking, the energy generated by a single deformation is very limited. Therefore, general piezoelectric ceramic power generation is used for vibration energy collection, using continuous vibration to generate continuous energy. Patent CN202385033U discloses a single-chip cantilever piezoelectric vibration generator, which uses the weight of the center of mass to repeatedly bend the cantilever beam in a vibrating environment, thereby causing the piezoelectric sheet of the cantilever beam to continuously generate energy.

[0005] However, this type of technology cannot be used in some specific occasions: for example, occasions that require a single pulse of electrical energy. For example, a self-generated remote control or switch. In this type of application, it is hoped that the elastic piezoelectric ceramic sheet will generate a high-energy pulse of electrical energy through the momentary action of the user pressing the switch or remote control button, and then supply it to the back-end wireless module to transmit wireless signals, thereby achieving the function of wireless remote control. It can be applied to self-generated doorbells, self-generated remote controls, self-generated switches, etc.

[0006] However, as mentioned above, the power generation of the elastic piezoelectric ceramic sheet is affected by the speed of deformation. Given the equivalent capacitance, size, and deformation degree of the piezoelectric sheet, its power generation largely depends on the speed of deformation. However, in actual use, if the user directly presses the elastic piezoelectric ceramic sheet, the pressing speed is relatively slow, and the pressing speeds of different users are different. This will result in very limited electrical energy if the user presses slowly.

[0007] In view of this, solving the above-mentioned problem so that the single pulse power generation of piezoelectric ceramics is not affected by user operations and a relatively large power generation can be stably obtained is the problem to be solved by the patent of this invention. [Summary of the invention]

[0008] The technical problem to be solved by the present invention is that in the prior art, if a user directly presses the elastic piezoelectric ceramic sheet, the pressing speed is relatively slow, so the electric energy generated is very limited.

[0009] A further technical problem to be solved by the present invention is that different users have different pressing speeds, which may cause large fluctuations in the generated electrical energy.

[0010] The present invention adopts the following technical solution:

[0011] In a first aspect, the present invention provides a piezoelectric ceramic power generation device, comprising an elastic piezoelectric ceramic sheet, a driving mechanism and a conversion device, specifically:

[0012] When the driving mechanism is subjected to an external force, the driving mechanism transmits the external force to the conversion device;

[0013] When the force applied to the conversion device is less than the first preset force, the conversion device does not move or deforms within a preset range;

[0014] When the force applied to the conversion device is greater than the first preset force, the conversion device moves quickly to hit the elastic piezoelectric ceramic sheet, and the elastic piezoelectric ceramic sheet generates electrical energy;

[0015] The elastic piezoelectric ceramic sheet specifically includes at least one piezoelectric ceramic sheet and at least one elastic substrate.

[0016] Preferably, the elastic substrate is brass, and the spring sheet thickness is not greater than 1 mm. Further, preferably, the piezoelectric ceramic thickness is not greater than 1 mm. In the preferred embodiment of the present invention, the capacitance of the piezoelectric ceramic sheet is not less than 10 nF. In addition, a parameter limitation of D33 of the piezoelectric ceramic sheet not less than 500x10-12 C / N can also be added.

[0017] In the present invention, in order to realize that the piezoelectric ceramic power generation device can return to the initial state after each power generation and ensure the normal operation of the next working process, usually when the force is less than the second preset force of the conversion device again, the conversion device returns to the initial state, so that the elastic piezoelectric ceramic sheet power generation process can be repeated under the external force in cooperation with the conversion device. In the specific implementation process, the second preset force can be the same as the first preset force, but usually the second preset force will be larger or smaller than the first preset force.

[0018] In the present invention, the conversion device includes a force-bearing area and a moving part (for example, when the conversion device is a pot piece, the force-bearing area is usually the central protrusion of the pot piece, and the moving part is a small part centered on the protrusion that will deform when entering the second state), and the conversion device also includes a first state and a second state, specifically:

[0019] When the force applied to the force-bearing area of ​​the conversion device is lower than the first preset force, the conversion device stays in the first state;

[0020] When the force applied to the force-bearing area is higher than the first preset force, the internal force of the conversion device is rapidly reduced, and driven by the external force transmitted from the driving mechanism, it rapidly leaves the first state and enters the second state of rapid action. The rapidity at this time is relative to the deformation speed of the elastic piezoelectric ceramic sheet obtained by directly applying the external force to the elastic piezoelectric ceramic sheet in the prior art. Figure 1 In the above, the specific implementation method of using the spring as the conversion device is taken as an example, wherein the first state is Figure 1 The state of the shrapnel is realized in the second state. Figure 1 The first preset force is the critical point force of the spring piece when it leaves the solid line state and enters the collapse process. When the spring piece is used as the conversion device, the internal force is specifically a maintenance force spontaneously generated by the spring piece for its default initial state.

[0021] In the present invention, taking the spring as the conversion device as an example, the second state is usually an unstable state; when the external force is removed, the conversion device automatically leaves the unstable second state and returns to the stable first state under the drive of the internal force. The above-mentioned unstable state especially refers to the characteristics of the conversion device itself, that is, it automatically leaves the unstable second state and returns to the stable first state without the assistance of external devices.

[0022] The conversion device is specifically a spring, the top of which is directly or indirectly connected to the driving mechanism. When the force is less than a preset value, the top of the spring does not bend or deforms within a preset range; when the force is greater than the preset value, the top of the spring collapses rapidly. The most typical spring that can achieve the above function can be a pot piece.

[0023] like Figure 2As shown, in addition to the above-mentioned method of using a spring to implement the conversion device, the present invention also provides a more ingenious method of implementing the conversion device, that is, using a magnetic adsorption method. Specifically, the conversion device includes a first magnet group and a second magnet group, wherein the first magnet group and the second magnet group form a one-to-one corresponding magnetic adsorption coupling structure, and the first magnet group is fixed on the housing of the piezoelectric ceramic power generation device, such as Figure 2 As shown in the figure, the first magnet group can be fixed by a form with an internal hanging arm, or the first magnet group can be fixed by the simplest columnar groove combined with fixing glue; the second magnet group is arranged on the driving mechanism, and the magnetic adsorption force is opposite to the direction of the external force. For the second magnet group, the method is more abundant. Since the driving mechanism is small in size, the second magnet group can be arranged on the driving mechanism by an integrated molding method, and an additional installation and fixing method can also be adopted. Among them, when the magnetic adsorption coupling structure is used as the conversion device, the internal force is specifically manifested as the magnetic adsorption force between the first magnet group and the second magnet group.

[0024] When the conversion device is subjected to an external force via the driving mechanism, and the external force is less than a first preset force, the first magnet group and the second magnet group are attracted to each other and do not separate;

[0025] When the external force is greater than the first preset force, the first magnet group and the second magnet group separate, and the magnetic adsorption force decreases rapidly; after the driving mechanism moves rapidly along the direction of the external force, it hits the elastic piezoelectric ceramic sheet to generate electrical energy. In order to achieve a better impact effect, it is necessary to set the distance between the first magnet and the second magnet when they reach the impact state after separation to ensure that the magnetic adsorption force that still exists between the two is small enough. Therefore, in this case, after the impact is completed, it is impossible to rely on the adsorption force of the first magnet and the second magnet themselves to connect the driving mechanism to the initial state. Therefore, in order to allow Figure 2 The conversion device shown can return to the initial state after an external force hits the piezoelectric ceramic. Usually, a reset device is also provided on the driving mechanism, so that after the external force is removed, the conversion device is driven to reset under the action of the reset mechanism. Specifically, the reset device can be as follows: Figure 2 The spring shown is arranged between the drive mechanism and the elastic piezoelectric ceramic plate.

[0026] The present invention also provides an extended solution for further improving the impact force, such as Figure 3 As shown, it also includes an energy storage device, which is located on the driving mechanism, specifically:

[0027] When the driving mechanism is subjected to an external force, the external force is transmitted to the conversion device while storing energy through the energy storage device; Figure 3 For example, when the button is pressed, the spring marked with the energy storage device will transfer the external force to the conversion device through the driving mechanism connected to the bottom while storing energy. Figure 3 The magnetic adsorption structure shown in .

[0028] When the force stored in the energy storage device is greater than the first preset force of the conversion device, the energy storage device releases the stored force and cooperates with the external force to push the conversion device to move quickly, generating electricity after impacting the elastic piezoelectric ceramic sheet.

[0029] In order to increase the service life of the elastic piezoelectric ceramic sheet when the driving mechanism impacts the elastic piezoelectric ceramic sheet, preferably, a buffer layer is further provided on the impact surface side of the driving mechanism and the elastic piezoelectric ceramic sheet, and the buffer layer is specifically a flexible material.

[0030] In a second aspect, the present invention also provides a piezoelectric ceramic power generation device, such as Figure 4 As shown, the device includes an upper shell, a lower shell, an elastic piezoelectric ceramic sheet and a spring, specifically:

[0031] The elastic piezoelectric ceramic sheet is fixed on the base of the lower shell, wherein after the elastic piezoelectric ceramic sheet is fixed, the gap between the bottom plate of the lower shell and the elastic piezoelectric ceramic sheet provides a space for the elastic piezoelectric ceramic sheet to generate electricity;

[0032] The spring sheet is located on one side of the elastic piezoelectric ceramic sheet, and the spring sheet includes a first state (such as Figure 1 and when the force applied to the spring piece is higher than the first preset force, the arc top of the spring piece collapses rapidly; the collapsed spring piece is as shown in the second state. Figure 1 The state is shown by the dotted line.

[0033] The upper shell is provided with a pressing area (such as Figure 4 As shown in the figure, the pressing area is used to obtain the external force and transmit it to the spring. At this time, the pressing area on the upper shell is a specific manifestation of the driving mechanism in the first aspect. The pressing area can be made of the same material as the upper shell, and after being processed by thinning or concave structure technology, the corresponding area is convenient for transmitting the external force to the spring. In addition, the pressing area proposed in the present invention can also adopt the key structure proposed in the subsequent expansion scheme.

[0034] like Figure 4 The piezoelectric ceramic power generator shown is an ultra-thin structure. However, for some other structural implementations, a button is usually set, such as Figure 6 As shown, the device further includes a key, and the key includes a key cap, a key cap brim and a key rod. In this case, the key constitutes the driving mechanism described in the first aspect, specifically:

[0035] The key rod is used to contact the spring sheet or the elastic piezoelectric ceramic sheet; Figure 6 and Figure 7 , which are schematic diagrams of the structure in which the key rod contacts the spring sheet and the elastic piezoelectric ceramic sheet, respectively. Figure 6 and Figure 7 The basic implementation principles are the same, the difference lies in whether the spring is arranged on the surface of the elastic piezoelectric ceramic sheet, or on the surface of the lower shell and below the deformation area of ​​the elastic piezoelectric ceramic sheet.

[0036] The button cap is exposed in the pressing area of ​​the upper shell, and the button is fixed in the housing by supporting the button cap brim with the lower surface of the upper shell.

[0037] In the present invention, preferably, the device further comprises a spring, which is nested outside the key rod, with one end of the spring abutting against the bottom of the key cap, and the other end abutting against the elastic piezoelectric ceramic sheet or the spring sheet. Whether the other end of the spring abuts against the elastic piezoelectric ceramic sheet or the spring sheet depends mainly on the size of the spring sheet and the size of the abutting surface of the spring, and whether the spring sheet is arranged in a position such as Figure 6 The elastic piezoelectric ceramic sheet shown is also arranged on top of the Figure 7 The elastic piezoelectric ceramic piece shown below is comprehensively determined, but all belong to one of the implementable methods of the present invention.

[0038] In the present invention, there is an optional implementation method of the elastic piezoelectric ceramic sheet structure, such as Figure 8 As shown, the elastic piezoelectric ceramic sheet specifically includes an upper piezoelectric ceramic sheet, a lower piezoelectric ceramic sheet and a substrate, wherein the upper piezoelectric ceramic sheet and the lower piezoelectric ceramic sheet are respectively arranged on the upper surface and the lower surface of the substrate, and the substrate is fixed on the base of the lower shell, as shown in FIG. Figure 4-Figure 7 shown.

[0039] In order to alleviate the problem that after the key is introduced, the elastic piezoelectric ceramic sheet is subjected to excessive local force and affects its service life due to the key rod directly hitting the elastic piezoelectric ceramic sheet or the key rod hitting the spring sheet and then indirectly hitting the elastic piezoelectric ceramic sheet, the present invention also provides a preferred implementation scheme, such as Fig. 9 As shown, when the spring sheet is located on the upper surface of the elastic piezoelectric ceramic sheet, the device further includes a pressing plate, and the pressing plate is further arranged between the spring sheet and the upper surface of the elastic piezoelectric ceramic sheet; wherein the spring sheet is fixed on the pressing plate.

[0040] like Fig.10 As shown, the technical solution of the present invention further considers that different users may have different strength and speed when performing the pressing action, which may lead to inconsistent power generation effects. In particular, when the user presses slowly, it may lead to insufficient power generation. Therefore, in combination with the present invention, there is also a preferred further solution, that is, introducing an energy storage device. Fig.10 As shown, the device further includes a button, a driving member and an energy storage device, wherein the button is coupled to the driving member via the energy storage device, and the driving device is used to contact the spring or elastic piezoelectric ceramic sheet. Fig. 9 and Fig.10 There are some differences between the buttons. Fig. 9 In the case of a button, the button is used directly to resist the spring, while in Fig.10 The driving member coupled with the energy storage device is used to achieve the collision with the spring. Generally, the energy storage device can be a spring, spring or other material that can restore deformation. Fig.10 In the process of pressing a button, the external force will first be stored in the energy storage device. When the stored energy reaches the critical point where the spring switches from the first state to the second state, the energy storage device releases the energy to ensure that the spring obtains enough energy in the second state, thereby ultimately ensuring that enough electrical energy is generated when it hits the elastic piezoelectric ceramic sheet.

[0041] In a third aspect, the present invention also provides a piezoelectric ceramic power generation device, such as Fig.11 As shown, the device includes an upper shell, a lower shell, an elastic piezoelectric ceramic sheet, a transition device and a spring, specifically:

[0042] The elastic piezoelectric ceramic sheet is fixed on the first base of the lower shell, wherein after the elastic piezoelectric ceramic sheet is fixed, the gap between the bottom plate of the lower shell and the elastic piezoelectric ceramic sheet provides a space for the elastic piezoelectric ceramic sheet to generate electricity;

[0043] The spring sheet is located above the elastic piezoelectric ceramic sheet and is arranged on the second base surface; wherein the transition device is arranged between the spring sheet and the elastic piezoelectric ceramic sheet, and one end of the transition device is at a preset distance from the lower surface of the spring sheet or the upper surface of the elastic piezoelectric ceramic sheet; the preset distance is determined according to the deformation size of the spring sheet before receiving an external force less than a first preset force;

[0044] The spring sheet includes a first state in which the spring sheet stays when the force applied to the spring sheet is lower than a first preset force; and a second state in which the top of the spring sheet collapses rapidly when the force applied to the spring sheet is higher than the first preset force;

[0045] The upper shell is provided with a pressing area, and the pressing area is used to obtain external force and transmit it to the spring sheet.

[0046] like Fig.12 As shown, there is also a preferred structure in combination with the implementation of the present invention, the device also includes a button, the button includes a button cap, a button cap brim and a button rod, specifically:

[0047] The key rod is used to contact the spring sheet or the elastic piezoelectric ceramic sheet;

[0048] The button cap is exposed in the pressing area of ​​the upper shell, and the button is fixed in the housing by supporting the button cap brim with the lower surface of the upper shell.

[0049] In combination with the present invention, there is also a preferred implementation method, such as Fig.13 As shown, the device also includes a spring, which is nested outside the key rod, with one end of the spring abutting against the bottom of the key cap and the other end abutting against the second base surface or the spring sheet.

[0050] In the present invention, there is an optional implementation method of the elastic piezoelectric ceramic sheet structure, such as Figure 8 As shown, the elastic piezoelectric ceramic sheet specifically includes an upper piezoelectric ceramic sheet, a lower piezoelectric ceramic sheet and a substrate, wherein the upper piezoelectric ceramic sheet and the lower piezoelectric ceramic sheet are respectively arranged on the upper surface and the lower surface of the substrate, and the substrate is fixed on the base of the lower shell.

[0051] like Fig.14 As shown, the technical solution of the present invention further considers that different users may have different strength and speed when performing the pressing action, which may lead to inconsistent power generation effects. In particular, when the user presses slowly, it may lead to insufficient power generation. Therefore, in combination with the present invention, there is also a preferred further solution, that is, introducing an energy storage device. Fig.14 As shown, the device further includes a button, a driving member and an energy storage device, wherein the button is coupled to the driving member via the energy storage device, and the driving device is used to contact the spring. Fig.13 and Fig.14 There are some differences between the buttons. Fig.13 In the case of a button, the button is used directly to resist the spring, while in Fig.14 The driving member coupled with the energy storage device is used to achieve the collision with the spring. Generally, the energy storage device can be a spring, spring or other material that can restore deformation. Fig.14In the process of pressing a button, the external force will first be stored in the energy storage device. When the stored energy reaches the critical point where the spring switches from the first state to the second state, the energy storage device releases the energy to ensure that the spring obtains enough energy in the second state, thereby ultimately ensuring that enough electrical energy is generated when it hits the elastic piezoelectric ceramic sheet.

[0052] In a fourth aspect, the present invention also provides a piezoelectric ceramic power generation device, such as Fig.15 As shown, the device includes an upper shell, a lower shell, an elastic piezoelectric ceramic sheet, a driving member, a first magnet group and a second magnet group. Specifically:

[0053] The elastic piezoelectric ceramic sheet is fixed on the first base of the lower shell, wherein after the elastic piezoelectric ceramic sheet is fixed, the gap between the bottom plate of the lower shell and the elastic piezoelectric ceramic sheet provides a space for the elastic piezoelectric ceramic sheet to generate electricity;

[0054] The first magnet group is fixed on the upper shell and coupled with the second magnet group fixed on the driving member, so that when the driving member is in an initial state, the magnetic attraction force between the first magnet group and the second magnet group is in a relatively static first state; wherein the first magnet group can be specifically fixed on the lower surface or the upper surface of the upper shell, preferably as follows Fig.15 and 14 On the lower surface of the upper shell shown.

[0055] The driving member also includes a second state in which the first magnet group and the second magnet group are rapidly separated when the applied force is higher than the first preset force;

[0056] The upper shell is provided with a pressing area, and the pressing area is used to obtain external force and transmit it to the driving member.

[0057] In the present invention, at least the following combinations are provided for the first magnet group and the second magnet group:

[0058] The first magnet group is a permanent magnet arranged at a preset position on the lower surface of the upper shell; the second magnet is a magnetic conductive member arranged on the upper surface of the driving member and corresponding to the permanent magnet; or,

[0059] The first magnet group is a magnetic conductive member arranged at a preset position on the lower surface of the upper shell; the second magnet is a permanent magnet arranged on the upper surface of the driving member and corresponding to the magnetic conductive member; or

[0060] The first magnet group is a permanent magnet arranged at a preset position on the lower surface of the upper shell; the second magnet is specifically a permanent magnet arranged on the upper surface of the driving member and corresponding to the magnetic conductive member; wherein, in the first magnet group and the second magnet group, the magnetic poles of the permanent magnets facing each other are opposite.

[0061] Optional, such as Fig.16 As shown, the device also includes a button, specifically:

[0062] The bottom of the button is fixed to the upper surface of the driving member;

[0063] The upper surface of the key is exposed in the pressing area of ​​the upper shell, and the initial state of the key is fixed by the magnetic adsorption force between the first magnet group fixed on the lower surface of the upper shell and the second magnet group arranged on the driving member.

[0064] like Fig.15 and Fig.16 As shown, the device also includes a spring, and the driving member is specifically a structure with the spring storage groove provided in the middle and a first magnetic conductive outer ring coupled to the second magnet; when the driving member collides with the elastic piezoelectric ceramic sheet, the spring is completely retracted into the storage groove.

[0065] like Fig.17 As shown, in combination with the present invention, an energy storage structure is provided in conjunction with the button, the device also includes a button, the button includes a button cap, a button brim and a button rod, wherein at least two undercuts are provided at the end of the button brim, specifically:

[0066] The bottom of the key rod or the driving member is used to contact the elastic piezoelectric ceramic sheet;

[0067] The upper surface of the driving member is provided with a first through hole for passing the key rod, and is also provided with an auxiliary through hole for arranging the at least two undercuts;

[0068] After at least two undercuts of the button brim pass through the auxiliary through hole, the side arms of the button brim and the auxiliary through hole form a radially movable range of the button relative to the driving member; wherein a force storage spring is provided in the space formed by the button brim, the button rod and the upper surface of the driving member.

[0069] In a fifth aspect, the present invention also provides a structure based on piezoelectric ceramic power generation, such as Fig.18 As shown, it includes the piezoelectric ceramic power generation device as described in the first aspect, the second aspect, the third aspect or the fourth aspect, as well as a rectifier module, an energy storage device and a wireless module, specifically:

[0070] The energy generated by the piezoelectric ceramic power generation device reaches the energy storage device through the rectifier module;

[0071] The wireless module is connected to the energy storage device and is used to send a wireless control signal after obtaining power from the energy storage device.

[0072] In addition, in this implementation, more complex processing can be introduced. Fig. 20 As shown, the structure may also include a control device, which is connected to the wireless module and the energy storage device respectively to prepare the data and workflow required by the wireless transmission module.

[0073] For the use of multiple keys, there is also a preferred implementation scheme, such as Fig.21 As shown, it also includes at least one sensor (such as Fig.21 As shown, a schematic structural scenario including three buttons and three sensors is given), connected to the control device to detect the action of one or more buttons being pressed, and the detection data is transmitted to the control device so that the control device confirms the control signal corresponding to the pressed button.

[0074] In combination with the implementation scheme of the present invention, preferably, a voltage conversion module may also be included, such as Fig. 22 As shown, the voltage conversion device is connected between the energy storage device and the wireless module, and is used to convert the voltage of the energy storage device into the voltage required by the wireless module. In addition, there is also a control device, and when the wireless module is driven by the control device, as shown in FIG. Fig.23 As shown, the voltage conversion device can also be connected between the energy storage device and the control device.

[0075] In combination with the implementation scheme of the present invention, preferably, a transmission device may also be included to transmit the actions of at least two buttons to the same elastic piezoelectric ceramic sheet. The transmission device may be, for example, Fig. 27 The joystick shown in the figure can transmit the actions of the three buttons shown therein to the piezoelectric ceramic power generation device through the joystick.

[0076] In combination with the embodiment of the present invention, preferably, at least two piezoelectric ceramic power generation devices and a matching number of buttons are included, specifically:

[0077] Each piezoelectric ceramic power generation device generates electricity when a corresponding key is pressed, and sends a wireless control signal matching the piezoelectric ceramic power generation device through the wireless module.

[0078] In combination with the embodiment of the present invention, preferably, at least two identification modules are also included, such as Fig.23As shown, the identification module is connected between the corresponding piezoelectric ceramic power generation device and the control device, and is used to feed back information that a designated key is pressed to the control device.

[0079] In addition, when each piezoelectric ceramic power generation device is equipped with a corresponding rectifier module and energy storage device, such as Fig.25 As shown, the identification module can also be connected between the corresponding energy storage device and the control device to feed back information that a designated key is pressed to the control device.

[0080] In a sixth aspect, the present invention further provides a piezoelectric ceramic power generation method, comprising:

[0081] gradually increasing the force, the force is applied to the energy storage device, and the energy storage device gradually accumulates the force;

[0082] When the force exceeds the preset limit, the conversion device is triggered to act, and the moving part of the conversion device moves rapidly to hit the elastic piezoelectric ceramic sheet to generate electricity;

[0083] The electric energy generated by the elastic piezoelectric ceramic sheet is provided to the wireless transmitting module to send a wireless signal.

[0084] Preferably, a sensor is also included, and the method further includes:

[0085] While triggering the piezoelectric ceramic to generate electricity, the sensor is also triggered to identify the specific key that is pressed among multiple keys.

[0086] Preferably, an electric energy identification device is also included, and the method further includes:

[0087] When one or more piezoelectric ceramic power generating devices among the plurality of piezoelectric ceramic power generating devices are triggered, the piezoelectric ceramic power generating device that is specifically triggered is detected through the electric energy identification device.

[0088] In combination with the embodiment of the present invention, preferably, an electric energy identification device is also included, and the method further includes:

[0089] When one or more piezoelectric ceramic power generating devices among the plurality of piezoelectric ceramic power generating devices are triggered, the piezoelectric ceramic power generating device that is specifically triggered is detected through the electric energy identification device.

[0090] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0091] The present invention adopts a conversion device with a first state and a second state, which plays a role in setting a driving threshold for the external force, that is, when the external force is less than the first preset force, the conversion device is in a first state of relative stillness or small deformation; and when the external force exceeds the first preset force, it can trigger the rapid deformation of the conversion device, and the corresponding rapid deformation speed will also be transferred to the elastic piezoelectric ceramic sheet, thereby generating greater power generation.

[0092] In the preferred embodiment of the present invention, an energy storage device is also used to store energy of the external force, which is either fast or slow in the prior art, and then release the stored energy while ensuring that there is little difference in the transfer to the elastic piezoelectric ceramic sheet, thereby improving the stability of power generation of the elastic piezoelectric ceramic sheet.

[0093] In a preferred embodiment of the present invention, in addition to the practicable spring-type conversion device, a magnetic adsorption-type conversion device is also provided, which significantly improves the service life of the conversion device, and can provide a conversion device with richer models corresponding to the first preset force by adjusting the magnitude of the magnetic adsorption force.

Brief Description of the Drawings

[0094] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0095] Figure 1 It is a structural schematic diagram of a spring sheet used as a conversion device provided by an embodiment of the present invention;

[0096] Figure 2 It is a schematic diagram of the structure of a conversion device implemented by magnetic adsorption provided by an embodiment of the present invention;

[0097] Figure 3 It is a schematic structural diagram of an extended solution for further improving the impact force provided by an embodiment of the present invention;

[0098] Figure 4 is a schematic structural diagram of a piezoelectric ceramic power generation device provided by an embodiment of the present invention;

[0099] Figure 5 It is a schematic diagram of the partial shape and structure of an elastic piezoelectric ceramic provided by an embodiment of the present invention;

[0100] Figure 6 It is a structural schematic diagram of a piezoelectric ceramic power generation device with a key provided in an embodiment of the present invention;

[0101] Figure 7 It is a schematic diagram of another layout structure of elastic piezoelectric ceramic sheets provided by an embodiment of the present invention;

[0102] Figure 8 It is a schematic diagram of the structure of an elastic piezoelectric ceramic sheet provided by an embodiment of the present invention;

[0103] Fig. 9 It is a schematic structural diagram of a piezoelectric ceramic power generation device with a pressure plate provided in an embodiment of the present invention;

[0104] Fig.10 It is a schematic structural diagram of a piezoelectric ceramic power generation device with an energy storage device provided by an embodiment of the present invention;

[0105] Fig.11 It is a schematic structural diagram of a piezoelectric ceramic power generation device with a transition device provided by an embodiment of the present invention;

[0106] Fig.12 It is a structural schematic diagram of a piezoelectric ceramic power generation device with a transition device and a key provided in an embodiment of the present invention;

[0107] Fig.13 It is a schematic structural diagram of a piezoelectric ceramic power generation device with a restoring device provided by an embodiment of the present invention;

[0108] Fig.14 It is a schematic structural diagram of a comprehensive piezoelectric ceramic power generation device provided by an embodiment of the present invention;

[0109] Fig.15 It is a schematic structural diagram of a piezoelectric ceramic power generation device that realizes a driving mechanism by magnetic adsorption, provided in an embodiment of the present invention;

[0110] Fig.16 It is a structural schematic diagram of a magnetic adsorption type piezoelectric ceramic power generation device with a key provided in an embodiment of the present invention;

[0111] Fig.17 It is a structural schematic diagram of a magnetic adsorption type piezoelectric ceramic power generation device with an energy storage device provided by an embodiment of the present invention;

[0112] Fig.18 It is a schematic diagram of the structure of a piezoelectric ceramic power generation provided by an embodiment of the present invention;

[0113] Fig.19 It is a module schematic diagram of a piezoelectric ceramic power generation structure provided by an embodiment of the present invention;

[0114] Fig. 20 It is a structural schematic diagram of a piezoelectric ceramic power generation with a control device provided by an embodiment of the present invention;

[0115] Fig.21 It is a structural schematic diagram of a multi-key piezoelectric ceramic power generation provided by an embodiment of the present invention;

[0116] Fig. 22 It is a structural schematic diagram of a piezoelectric ceramic power generation with a voltage conversion device provided by an embodiment of the present invention;

[0117] Fig.23 It is a structural schematic diagram of a multi-piezoelectric ceramic power generation device provided by an embodiment of the present invention;

[0118] Fig.24 is a structural diagram of an identification module provided by an embodiment of the present invention;

[0119] Fig.25 is a schematic diagram of another structure of a multi-piezoelectric ceramic power generation device provided by an embodiment of the present invention;

[0120] Fig.26 This is an exploded diagram of a multi-key piezoelectric ceramic power generation structure provided by an embodiment of the present invention;

[0121] Fig. 27 This is an exploded diagram of another multi-key piezoelectric ceramic power generation structure provided by an embodiment of the present invention;

[0122] Fig.28 It is a schematic diagram of the structure of another multi-key piezoelectric ceramic power generation provided by an embodiment of the present invention. [Specific implementation method]

[0123] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0124] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0125] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0126] The pot piece (also known as metal dome, snap dome) used in the embodiment of the present invention is made of ultra-thin (0.05mm-1.5mm thickness) and ultra-hard (generally hardness between HV480-550) stainless steel material. It is mainly used in membrane switches, micro switches, PCB boards, printed circuit boards, hard boards and other products. It has several advantages such as stable contact, strong conductivity, stable rebound and good hand feel.

[0127] In order to improve the power generation efficiency and the stability of use of the elastic piezoelectric ceramic sheet in each embodiment of the present invention, the elastic piezoelectric ceramic sheet is usually made into a structure including an upper piezoelectric ceramic sheet, a lower piezoelectric ceramic sheet and a substrate, wherein the upper piezoelectric ceramic sheet and the lower piezoelectric ceramic sheet are respectively arranged on the upper surface and the lower surface of the substrate to increase the power generation, and the elastic characteristics of the substrate ensure that the entire elastic piezoelectric ceramic sheet can provide sufficient rigidity for the elastic piezoelectric ceramic sheet when it receives external impact to generate electricity. For example: the upper piezoelectric ceramic sheet and the lower piezoelectric ceramic sheet can be made of high-voltage electrical characteristic ceramic materials, preferably, they can be made of piezoelectric ceramic materials with a high-voltage electrical constant d33 greater than 800pc / N. In addition, a single-layer piezoelectric ceramic sheet structure, or an elastic piezoelectric ceramic sheet structure achieved by directly bonding the upper piezoelectric ceramic sheet and the lower piezoelectric ceramic sheet, all fall within the protection scope of the present invention.

[0128] Embodiment 1:

[0129] Embodiment 1 of the present invention provides a piezoelectric ceramic power generation device, such as Figure 4 As shown, the device includes an upper shell, a lower shell, an elastic piezoelectric ceramic sheet and a spring. In order to ensure the excellent rebound characteristics of the spring, in an embodiment of the present invention, the spring can be implemented by a pot sheet. Specifically:

[0130] The elastic piezoelectric ceramic sheet is fixed on the base of the lower shell, wherein after the elastic piezoelectric ceramic sheet is fixed, the gap between the bottom plate of the lower shell and the elastic piezoelectric ceramic sheet provides a space for the elastic piezoelectric ceramic sheet to generate electricity. In an embodiment of the present invention, the base is usually arranged in a designated area of ​​the elastic piezoelectric ceramic sheet substrate. Preferably, a three-point layout is adopted, because the fewer the layout points of the base, the greater the deformation of the elastic piezoelectric ceramic sheet under the same force, which can bring greater power generation. Figure 5As shown, there are several typical elastic piezoelectric ceramic sheet shapes and corresponding three-point base layout diagrams, including a circular elastic piezoelectric ceramic sheet in method 1, a square elastic piezoelectric ceramic sheet in method 2, and a triangular elastic piezoelectric ceramic sheet in method 3. The specific method is usually set according to the shape of the shell. Of course, for the embodiments of the present invention, other forms of bases that also play the role of fixing the elastic piezoelectric ceramic sheet and providing elastic deformation space also fall within the scope of protection of the present invention.

[0131] The spring sheet is located on one side of the elastic piezoelectric ceramic sheet, and the spring sheet includes a first state (such as Figure 1 and when the force applied to the spring piece is higher than the first preset force, the arc top of the spring piece collapses rapidly; the collapsed spring piece is as shown in the second state. Figure 1 The state is shown by the dotted line.

[0132] The embodiment of the present invention utilizes the difference in deformation speed before and after the first preset force of the above-mentioned spring piece, completes the threshold setting of the external force corresponding to the first preset force, and ensures that when the spring piece enters the second state of collapse, it has sufficient acceleration according to the formula F=m*a; wherein F is the magnitude of the force, m is the mass of the spring piece, and a is the acceleration value.

[0133] The upper shell is provided with a pressing area, which is used to obtain external force and transmit it to the spring. Figure 4 As shown, it is a schematic diagram of the simplest pressing area structure design provided in an embodiment of the present invention. The pressing area can be made of the same material as the upper shell (for example, polyester, polyethylene or polypropylene, etc.), and after being processed by thinning or concave structure technology, the corresponding area can be convenient for transmitting the external force to the spring. In addition, the pressing area proposed in the present invention can also adopt the key structure proposed in the subsequent expansion scheme. Relatively speaking, the key structure can more effectively concentrate the external force on the force-bearing area of ​​the spring through the key rod, thereby forming a more effective second state (i.e., faster speed and more power generation); the principle of the two differences is that if the key rod is used, Figure 4 The structure of the pressing area on the force-bearing area of ​​the spring is usually larger than the force-bearing area of ​​the key rod after the key is used. Therefore, in the case of Figure 4 The pressing area shown and Figure 6 When the buttons shown are subjected to the same external force, Figure 6 The key rod shown can generate greater pressure on the force-bearing area of ​​the spring, which is beneficial to the performance of the spring in the second state.

[0134] like Figure 6As shown, the key provided in the embodiment of the present invention includes a key cap, a key cap brim and a key rod, specifically:

[0135] The key rod is used to contact the spring sheet or the elastic piezoelectric ceramic sheet. Figure 6 and Figure 7 , which are schematic diagrams of the structure in which the key rod contacts the spring sheet and the elastic piezoelectric ceramic sheet, respectively. Figure 6 and Figure 7 The basic implementation principle is the same, the difference lies in whether the spring is arranged on the surface of the elastic piezoelectric ceramic sheet, or arranged on the surface of the lower shell and located below the deformation area of ​​the elastic piezoelectric ceramic sheet. Figure 6 and Figure 7 The two layout methods can still derive significant structural differences, for example: Figure 7 For the structure of, a plurality of springs can be arranged under the elastic piezoelectric ceramic sheet, and the plurality of springs can be driven to switch from the first state to the second state by pressing the elastic piezoelectric ceramic sheet with a key; Figure 6 In the structure shown, it is impossible to realize the above-mentioned solution of one button driving multiple springs (although it can be accomplished by setting multiple button rods in one button, but considering that the springs themselves need to occupy a certain area, it is difficult to arrange them in a centralized manner. Therefore, it puts forward high requirements on the rigidity of the button rod and the size of the button, and it is extremely difficult to implement it in practice). Figure 7 The structure shown, when provided with a plurality of spring pieces, can obtain a greater first preset force effect, and thus can generate a more considerable amount of power generation.

[0136] The button cap is exposed in the pressing area of ​​the upper shell (compared to Figure 4 In this case, the pressing area is a through hole that can accommodate the key cap, and the key cap brim is supported by the lower surface of the upper shell to fix the key in the shell.

[0137] In the embodiment of the present invention, whether it corresponds to Figure 6 The structure shown in the figure is located above the elastic piezoelectric ceramic sheet, which is similar to Figure 7 In the structure shown, the spring is located below the elastic piezoelectric ceramic sheet. For the key to return to the initial state more quickly, especially when the key is in the initial state, there needs to be a gap between the key rod and the elastic piezoelectric ceramic sheet or spring (usually in order to have a large initial acceleration when the key is subjected to external force), an external force must be applied to lift the key. Specifically, Figure 7 and Figure 8As shown, the device also includes a spring, which is nested outside the key rod, with one end abutting against the bottom of the key cap and the other end abutting against the elastic piezoelectric ceramic sheet or the spring. Whether the other end of the spring abuts against the elastic piezoelectric ceramic sheet or the spring depends mainly on the size of the spring and the size of the abutting surface of the spring, and whether the spring is arranged in a Figure 6 The elastic piezoelectric ceramic sheet shown is also arranged on top of the Figure 7 The elastic piezoelectric ceramic sheet shown below is comprehensively determined (for example, when the area of ​​the spring is large enough and the spring is located on the upper surface of the elastic piezoelectric ceramic sheet, the lower end of the spring abuts against the surface of the spring), but all belong to one of the implementable methods of the present invention.

[0138] In the embodiment of the present invention, in order to alleviate the problem that after the key is introduced, the elastic piezoelectric ceramic sheet is subjected to excessive force locally, which affects the service life, due to the key rod directly hitting the elastic piezoelectric ceramic sheet or the key rod hitting the spring sheet and then indirectly hitting the elastic piezoelectric ceramic sheet, the present invention also provides a preferred implementation scheme, such as Fig. 9 As shown, when the spring sheet is located on the upper surface of the elastic piezoelectric ceramic sheet, the device also includes a pressure plate, and the pressure plate is also provided between the spring sheet and the upper surface of the elastic piezoelectric ceramic sheet; wherein the spring sheet is fixed on the pressure plate. Normally, the pressure plate and the elastic piezoelectric ceramic sheet are always in contact, therefore, it is preferred that the elastic coefficients of the pressure plate and the elastic piezoelectric ceramic sheet are close to each other. The pressure plate can ensure that the pressing area is relatively large, the force is evenly distributed, and it is not easy to crush the elastic piezoelectric ceramic sheet.

[0139] Embodiment 2:

[0140] Although the piezoelectric sheet can be deformed quickly by utilizing the rapid deformation characteristics of the spring, the spring will contact the piezoelectric ceramic before deformation. Therefore, before it crosses the critical point, the force applied by the user will also act on the elastic piezoelectric ceramic sheet, and the elastic piezoelectric ceramic sheet will also be deformed to a certain extent. This part of the deformation is caused by the user's slow pressing, so the power generation is very small, that is, the contribution of this part of the deformation to the power generation is relatively small. In order to solve the potential deficiencies in Example 1, the embodiment of the present invention also provides a piezoelectric ceramic power generation device, such as Fig.11 As shown, the device includes an upper shell, a lower shell, an elastic piezoelectric ceramic sheet, a transition device and a spring, specifically:

[0141] The elastic piezoelectric ceramic sheet is fixed on the first base of the lower shell, wherein after the elastic piezoelectric ceramic sheet is fixed, the gap between the bottom plate of the lower shell and the elastic piezoelectric ceramic sheet provides a space for the elastic piezoelectric ceramic sheet to generate electricity;

[0142] The spring is located above the elastic piezoelectric ceramic sheet and is arranged on the second base surface; wherein, the transition device is arranged between the spring and the elastic piezoelectric ceramic sheet, and one end of the transition device is at a preset distance from the lower surface of the spring or the upper surface of the elastic piezoelectric ceramic sheet; the preset distance is determined according to the deformation magnitude of the spring before receiving an external force less than the first preset force. In the specific implementation, the above-mentioned non-use is still considered in consideration of the use of the piezoelectric ceramic power generation device, for example, when the piezoelectric ceramic power generation device is used forward, one end of the transition device is at a preset distance from the lower surface of the spring; when the piezoelectric ceramic power generation device is used upside down, one end of the transition device is at a preset distance from the upper surface of the elastic piezoelectric ceramic sheet; and when the piezoelectric ceramic power generation device is used upright, the preset distance will be dynamically allocated between the upper surface of the piezoelectric ceramic sheet and the lower surface of the spring.

[0143] The spring sheet comprises a first state in which the spring sheet stays when the force acting on the spring sheet is lower than a first preset force; and a second state in which the arc top of the spring sheet collapses rapidly when the force acting on the spring sheet is higher than the first preset force; and the spring sheet contacts the elastic piezoelectric ceramic sheet through the transition device, and further drives the elastic piezoelectric ceramic sheet to deform to complete power generation.

[0144] The upper shell is provided with a pressing area, and the pressing area is used to obtain external force and transmit it to the spring sheet.

[0145] Similar to Example 1, the corresponding Fig.11 The structure is a streamlined, ultra-thin piezoelectric ceramic power generation device. However, due to the requirements on the material and processing of the pressing area of ​​the upper shell, it usually leads to an increase in processing costs in addition to its aesthetics. Therefore, similar to Example 1, an alternative structure for the button is also provided in the embodiment of the present invention.

[0146] like Fig.12 As shown, the button includes a button cap, a button cap brim and a button rod, specifically:

[0147] The key rod is used to contact the spring sheet or elastic piezoelectric ceramic sheet; the key cap is exposed in the pressing area of ​​the upper shell, and the key cap brim is supported by the lower surface of the upper shell to fix the key in the shell. In order to improve the rebound speed of the key, and for similar reasons as in embodiment 1, there is also a preferred implementation method in combination with the present invention, such as Fig.13 As shown, the device further includes a spring, which is nested outside the key rod, with one end of the spring abutting against the bottom of the key cap and the other end abutting against the second base surface or the spring sheet. Fig.13As shown, the second base surface can be installed on the second base after the elastic piezoelectric ceramic sheet and the transition device are fixed; or it can be made into one piece with the second base and inverted on the bottom plate of the lower shell in the form of a pot cover, and a through hole is provided in the middle of the second base corresponding to the area where the spring sheet and the transition device are provided, so as to ensure the effective transmission of the force between the key rod, the spring sheet and the transition device.

[0148] The embodiment of the present invention utilizes the preset distance reserved when setting the transition device, ensuring that the slight deformation of the spring when in the first state will not affect the elastic piezoelectric ceramic sheet itself, thereby affecting the normal power generation deformation process of the elastic piezoelectric ceramic sheet when the spring enters the second state. Compared with the method of embodiment 1, although the embodiment of the present invention is more complex in structure, it has made the ultimate exploration of the power generation process of the elastic piezoelectric ceramic sheet.

[0149] Embodiment 3:

[0150] The above embodiments use spring pieces (e.g., conventional pot pieces) as the "conversion device" to implement the solution. Although the structure is simple and the cost is relatively low, similar pot pieces have problems with lifespan, and the pot pieces themselves are relatively thin, and the installation and fixation with other components is also relatively troublesome. The embodiment of the present invention provides another solution based on a "conversion device" in a different implementation form, that is, using the adsorption of magnets to achieve the function of the conversion device.

[0151] like Fig.15 As shown, the device proposed in the embodiment of the present invention includes an upper shell, a lower shell, an elastic piezoelectric ceramic sheet, a driving member, a first magnet group and a second magnet group. Specifically:

[0152] The elastic piezoelectric ceramic sheet is fixed on the first base of the lower shell, wherein after the elastic piezoelectric ceramic sheet is fixed, the gap between the bottom plate of the lower shell and the elastic piezoelectric ceramic sheet provides a space for the elastic piezoelectric ceramic sheet to generate electricity; wherein the fixing method can be gluing, and the edge of the elastic piezoelectric ceramic sheet can be clamped by the buckle of the first base (such as Fig.15 It can also be fixed with screws, etc.

[0153] The first magnet group is fixed on the upper shell and coupled with the second magnet group fixed on the driving member, so that when the driving member is in an initial state, the magnetic attraction force between the first magnet group and the second magnet group is in a relatively static first state. Fig.17As shown, a simple method for fixing the first magnet group is provided, wherein the first magnet group is composed of a single magnet or multiple magnets in a ring shape, and the single magnet or multiple magnets are embedded in a groove set on the back of the upper shell, and a buckle is also provided on at least one side of the groove wall of the corresponding groove so as to fix the single magnet or multiple magnets embedded in the groove. Fig.15 In the structure shown, the second magnet can be an integrally formed structure with the driving member. For example, when the first magnet is a permanent magnet, the driving member can be integrally formed with a magnetic conductor. It can also be a driving member made of a composite material, and a second magnet is arranged in the area where the driving member is coupled with the first magnet.

[0154] The driving member also includes a second state in which the first magnet group and the second magnet group quickly separate when the applied force is higher than the first preset force. The first preset force at this time has a different meaning compared to the first preset force in Example 1. The first preset force in the embodiment of the present invention is manifested as the critical force required for the first magnet group and the second magnet group to separate from the initial magnetic adsorption static state.

[0155] The upper shell is provided with a pressing area, which is used to obtain external force and transmit it to the driving member. For the description of the corresponding pressing area, please refer to the relevant content in Example 1, which will not be repeated here.

[0156] In the embodiment of the present invention, although the specific implementation of the first magnet group and the second magnet group has been partially introduced above, it is not a comprehensive list of possible implementation forms. Therefore, for the first magnet group and the second magnet group, the system provides at least the following combination implementation methods:

[0157] The first magnet group is a permanent magnet arranged at a preset position on the lower surface of the upper shell; the second magnet is a magnetic conductive member arranged on the upper surface of the driving member and corresponding to the permanent magnet; or,

[0158] The first magnet group is a magnetic conductive member arranged at a preset position on the lower surface of the upper shell; the second magnet is a permanent magnet arranged on the upper surface of the driving member and corresponding to the magnetic conductive member; or

[0159] The first magnet group is a permanent magnet arranged at a preset position on the lower surface of the upper shell; the second magnet is specifically a permanent magnet arranged on the upper surface of the driving member and corresponding to the magnetic conductive member; wherein, in the first magnet group and the second magnet group, the magnetic poles of the permanent magnets facing each other are opposite.

[0160] Optional, such as Fig.16 As shown, the device also includes a button, specifically:

[0161] The bottom of the button is fixed to the upper surface of the driving member;

[0162] The upper surface of the button is exposed in the pressing area of ​​the upper shell, and the initial state of the button is fixed by the magnetic adsorption force between the first magnet group fixed on the lower surface of the upper shell and the second magnet group arranged on the driving member. In the above optional manner, the setting of the button can be based on aesthetic considerations or on the cost considerations of the integral molding of the driving member. In the embodiment of the present invention, more buttons are designed for the energy storage structure to be introduced below.

[0163] like Fig.15 and Fig.16 As shown, the device also includes a spring, and the driving member is specifically a structure in which the spring storage groove is provided in the middle and a first magnetic conductive outer ring coupled with the second magnet is provided; when the driving member collides with the elastic piezoelectric ceramic sheet, the spring is completely retracted into the storage groove. For ultra-thin designs, for example Fig.15 In the structure shown, the spring shown is not necessarily necessary, because after the driving member hits the elastic piezoelectric ceramic sheet, the distance between the first magnet and the second magnet can also be used to attract the driving member back to the initial position through the magnetic attraction force between the two. Fig.16 As shown in the setting button, when the driving member is set at a large distance from the upper surface of the elastic piezoelectric ceramic sheet (usually in order to obtain a larger acceleration of the driving member), at this time, the driving member cannot be adjusted to the initial position only by the magnetic adsorption force between the first magnet and the second magnet. At this time, the spring is needed to perform the corresponding function.

[0164] like Fig.17 As shown, in combination with the present invention, an energy storage structure is provided in conjunction with the key, wherein the key comprises a key cap, a key brim and a key rod, wherein at least two undercuts are provided at the end of the key brim, specifically:

[0165] The bottom of the key rod or the driving member is used to contact the elastic piezoelectric ceramic sheet; Fig.17 For example, the key rod and the spring arranged at the bottom of the lower shell are combined to complete the function of the key rebounding to the initial position; and the task of hitting the elastic piezoelectric ceramic sheet is given to the driving member; however, in the actual implementation process, if the key rod and the corresponding spring are arranged on the upper surface of the elastic piezoelectric ceramic sheet, and after entering the second state, the key rod hits the upper surface of the elastic piezoelectric ceramic sheet before the driving member, then the above-mentioned key rod is used to touch the elastic piezoelectric ceramic sheet.

[0166] The upper surface of the driving member is provided with a first through hole for passing the key rod, and is also provided with an auxiliary through hole for arranging the at least two undercuts;

[0167] After at least two undercuts of the button brim pass through the auxiliary through hole, the side arms of the button brim and the auxiliary through hole form a radially movable range of the button relative to the driving member; wherein a force storage spring is provided in the space formed by the button brim, the button rod and the upper surface of the driving member.

[0168] Compared with Embodiment 1 and Embodiment 2, the embodiment of the present invention belongs to another conversion device implementation scheme, which uses a magnetic adsorption structure to replace the spring structure, which has greatly improved the service life and the diversification of the structural design. For example, Fig.16 and Fig.17 For example, a driving member can be used to impact the elastic piezoelectric ceramic sheet, and a key rod can also be used to impact the elastic piezoelectric ceramic sheet. Moreover, compared with embodiment 1, the setting of the first preset force is more flexible and the setting range is larger.

[0169] Embodiment 4:

[0170] After the present invention has described a number of piezoelectric ceramic power generation devices through the above-mentioned embodiments 1 to 3, the present invention further describes a structure that can be implemented based on the above-mentioned various piezoelectric ceramic power generation devices through this embodiment, such as Fig.18 and Fig.19 As shown, in addition to one or more piezoelectric ceramic power generation devices in the above embodiments, it also includes a rectifier module, an energy storage device and a wireless module, specifically:

[0171] The energy generated by the piezoelectric ceramic power generation device reaches the energy storage device through the rectifier module;

[0172] The wireless module is connected to the energy storage device and is used to send a wireless control signal after obtaining power from the energy storage device.

[0173] In addition to the energy storage device, in this implementation, more complex processing can also be introduced. Fig. 20 As shown, the structure may also include a control device, which is connected to the wireless module and the energy storage device respectively to prepare the data and workflow required by the wireless transmission module.

[0174] In combination with the implementation scheme of the present invention, preferably, a voltage conversion module may also be included, such as Fig. 22As shown, the voltage conversion device is connected between the energy storage device and the wireless module, and is used to convert the voltage of the energy storage device into the voltage required by the wireless module. In addition, there is also a control device, and when the wireless module is driven by the control device, as shown in FIG. Fig.23 As shown, the voltage conversion device can also be connected between the energy storage device and the control device.

[0175] Embodiment 5:

[0176] After providing a series of feasible structures based on the piezoelectric ceramic power generation device described in any one of the above-mentioned embodiments 1 to 3 in embodiment 4, the embodiment of the present invention further proposes a multi-button structure based on embodiment 4, so as to be applicable to a more complex control environment. Fig.23 As shown. After being triggered, any of the three piezoelectric ceramic power generation devices follows the path shown by the corresponding solid arrow, passing through the corresponding rectifier module, energy storage device and power conversion module to supply power to the rear-end load. At the same time, the induced voltage of the triggered piezoelectric ceramic power generation device also reaches the corresponding identification module along the dotted arrow, and the corresponding identification module sends the detected voltage detection signal of the corresponding piezoelectric ceramic power generation device being triggered to generate electricity to the control device. Fig.24 As shown, it is a typical identification module circuit structure diagram provided by the embodiment of the utility model, and its left input port is connected to Fig.23 The piezoelectric ceramic generator in the right end output port is connected to Fig.23 The control device in.

[0177] In another embodiment, the specific control process is as follows: Fig.25 In this implementation, the outputs of the rectifier module and the energy storage device are multiplexed into the power supply input of the conventional control device and the voltage collection input of the identification module. Fig.23 The identification module is directly connected to the piezoelectric ceramic power generation device. In this embodiment, the identification module is connected to Fig.23 The output end of the energy storage device is connected to Fig.25 After any piezoelectric ceramic power generation device is triggered, the induced voltage generated by it reaches the corresponding rectifier module and energy storage device. The energy storage device outputs electric energy to the power conversion module to supply power to the rear-end load, and outputs a detection voltage to the corresponding identification module, so that the identification module outputs a detection signal to the control device to tell the control device which piezoelectric ceramic power generation device is specifically triggered. The corresponding structure can be adopted as follows Fig.26 The structural diagram shown.

[0178] Embodiment 6:

[0179] The multi-key scenarios proposed in Example 5 of the present invention are all implemented by providing multiple piezoelectric ceramic power generation devices, as well as supporting rectifier modules and energy storage devices. The advantage is that the keys can be arranged and implemented at a relatively long distance, that is, it can be applicable to various complex key situations. For example, it can be used to implement scenarios similar to self-generating electronic pianos that require multiple keys and a large space for key distribution. However, the relative structural complexity and cost will be increased. The present invention takes the above-mentioned problems into consideration and is further based on a scenario where the layout space between specific keys is relatively small. At this time, for each key, the piezoelectric ceramic power generation device can be reused, and its structural diagram and functional module diagram are shown as follows respectively. Fig. 27 and Fig.28 shown.

[0180] pass Fig. 27 The joystick shown can establish a driving coupling relationship between the three buttons in the figure and a single piezoelectric ceramic power generation device, that is, when any button is pressed, the piezoelectric ceramic power generation device can be driven to complete power generation. Fig.28 As shown, the recognition of each button is completed through the corresponding sensor. Fig. 27 In general, corresponding sensors (including sensor 1, sensor 2 and sensor 3 shown in the figure) are arranged at the active area of ​​each key.

[0181] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A piezoelectric ceramic power generation device, characterized in that: It includes elastic piezoelectric ceramic sheets, driving mechanisms and conversion devices, specifically: When the driving mechanism is subjected to an external force, the driving mechanism transmits the external force to the conversion device; When the force applied to the conversion device is less than the first preset force, the conversion device does not move or deforms within a preset range; When the force applied to the conversion device is greater than the first preset force, the conversion device moves quickly to hit the elastic piezoelectric ceramic sheet, and the elastic piezoelectric ceramic sheet generates electrical energy; The conversion device is specifically a spring sheet, the arc top of which is directly or indirectly connected to the driving mechanism. When the force is less than a preset value, the arc top of the spring sheet does not bend or deforms within a preset range and maintains the first state. When the driving mechanism is subjected to an external force, the external force is transmitted to the spring sheet while storing energy through the energy storage device. When the force accumulated by the energy storage device is greater than the first preset force, the energy storage device releases the accumulated force and cooperates with the external force to push the spring sheet to move quickly. The arc top of the spring sheet collapses rapidly to form the second state of the spring sheet, and the spring sheet directly acts on the elastic piezoelectric ceramic sheet and impacts the elastic piezoelectric ceramic sheet. The second state is an unstable state. When the external force is removed, the conversion device automatically leaves the unstable second state and returns to the stable first state. The elastic piezoelectric ceramic sheet specifically includes at least one piezoelectric ceramic sheet and at least one elastic substrate.

2. The piezoelectric ceramic power generator according to claim 1, characterized in that: The conversion device includes a force-bearing area and a moving part, and the conversion device also includes a first state and a second state. Specifically: When the force applied to the force-bearing area of ​​the conversion device is lower than the first preset force, the conversion device stays in the first state; When the force applied to the force-bearing area is higher than the first preset force, the internal force of the conversion device is rapidly reduced, and driven by the external force transmitted from the driving mechanism, the conversion device rapidly leaves the first state and enters the second state of rapid action.

3. The piezoelectric ceramic power generation device according to any one of claims 1 to 2, characterized in that: The energy storage device is located on the drive mechanism.

4. The piezoelectric ceramic power generating device according to claim 3 further comprises a reset device, so that after the external force is removed, the conversion device is driven to reset under the action of the reset mechanism.

5. The piezoelectric ceramic power generation device according to any one of claims 1-2, characterized in that: A buffer layer is also provided on the collision surface side between the driving mechanism and the elastic piezoelectric ceramic sheet, and the buffer layer is specifically made of a flexible material.

6. The piezoelectric ceramic power generation device according to any one of claims 1-2, characterized in that: The base material of the elastic piezoelectric ceramic sheet is brass, and the thickness of the spring sheet is not greater than 1 mm.

7. The piezoelectric ceramic power generation device according to any one of claims 1-2, characterized in that: The thickness of the elastic piezoelectric ceramic sheet is no more than 1 mm.

8. The piezoelectric ceramic power generation device according to any one of claims 1-2, characterized in that: The capacitance of the elastic piezoelectric ceramic piece is not less than 10nF.

9. The piezoelectric ceramic power generation device according to any one of claims 1-2, characterized in that: The D33 of the elastic piezoelectric ceramic sheet is not less than 500 x10-12C / N.

10. A piezoelectric ceramic power generation device, characterized in that: It includes elastic piezoelectric ceramic sheets, driving mechanisms and conversion devices, specifically: When the driving mechanism is subjected to an external force, it stores energy through the energy storage device and transmits the external force to the conversion device; when the force accumulated by the energy storage device is greater than the first preset force of the conversion device, the energy storage device releases the accumulated force and cooperates with the external force to push the conversion device to move quickly, and generates electricity after hitting the elastic piezoelectric ceramic sheet; when the force applied to the force area of ​​the conversion device is higher than the first preset force, the internal force of the conversion device is rapidly reduced, and driven by the external force transmitted from the driving mechanism, the conversion device quickly leaves the first state and enters the second state of rapid action; the second state is an unstable state, and when the external force is removed, the conversion device automatically leaves the unstable second state and returns to the stable first state; The conversion device comprises a first magnet group and a second magnet group, wherein the first magnet group and the second magnet group form a one-to-one corresponding magnetic adsorption coupling structure, the first magnet group is fixed on the housing of the piezoelectric ceramic power generation device, and the second magnet group is arranged on the driving mechanism, and the magnetic adsorption force is opposite to the external force. Specifically: When the conversion device is subjected to an external force via the driving mechanism, and the external force is less than a first preset force, the first magnet group and the second magnet group are attracted to each other and do not separate; When the external force is greater than the first preset force, the first magnet group and the second magnet group separate, and the magnetic adsorption force decreases rapidly; after the driving mechanism moves rapidly along the direction of the external force, it hits the elastic piezoelectric ceramic sheet to generate electrical energy.

11. The piezoelectric ceramic power generator according to claim 10, characterized in that: The energy storage device is located on the drive mechanism.

12. The piezoelectric ceramic power generating device according to claim 11 further comprises a reset device, so that after the external force is removed, the conversion device is driven to reset under the action of the reset mechanism.

13. The piezoelectric ceramic power generator according to claim 10, characterized in that: A buffer layer is also provided on the collision surface side between the driving mechanism and the elastic piezoelectric ceramic sheet, and the buffer layer is specifically made of a flexible material.

14. The piezoelectric ceramic power generator according to claim 10, characterized in that: The base material of the elastic piezoelectric ceramic sheet is brass, and the thickness of the spring sheet is not greater than 1 mm.

15. The piezoelectric ceramic power generator according to claim 10, characterized in that: The thickness of the elastic piezoelectric ceramic sheet is no more than 1 mm.

16. The piezoelectric ceramic power generator according to claim 10, characterized in that: The capacitance of the elastic piezoelectric ceramic piece is not less than 10nF.

17. The piezoelectric ceramic power generator according to claim 10, characterized in that: The D33 of the elastic piezoelectric ceramic sheet is not less than 500 x10-12C / N.

18. A piezoelectric ceramic power generation device, characterized in that: The device includes an upper shell, a lower shell, an elastic piezoelectric ceramic sheet and a spring, specifically: The elastic piezoelectric ceramic sheet is fixed on the base of the lower shell, wherein after the elastic piezoelectric ceramic sheet is fixed, the gap between the bottom plate of the lower shell and the elastic piezoelectric ceramic sheet provides a space for the elastic piezoelectric ceramic sheet to generate electricity; The spring sheet is located on one side of the elastic piezoelectric ceramic sheet; a pressing area is provided on the upper shell, and the pressing area is used to obtain external force and transmit it to the spring sheet; the arc top of the spring sheet is directly or indirectly connected to the pressing area, and when the force is less than a preset value, the arc top of the spring sheet does not bend or deforms within a preset range; when the pressing area receives the external force, it transmits the external force to the spring sheet while storing energy through the energy storage device, and when the force accumulated by the energy storage device is greater than the first preset force, the energy storage device releases the accumulated force and cooperates with the external force to push the spring sheet to move quickly, and the arc top of the spring sheet collapses rapidly to form the second state of the spring sheet; the second state is an unstable state, and when the external force is removed, the conversion device automatically breaks away from the unstable second state and returns to the stable first state.

19. The piezoelectric ceramic power generator according to claim 18, characterized in that: The pressing area is processed by thinning or concave structure technology, so that the corresponding area can easily transfer the external force to the spring sheet.

20. The piezoelectric ceramic power generator according to claim 18, characterized in that: If the pressing area adopts a key structure, the piezoelectric ceramic power generation device further includes a key, and the key includes a key cap, a key cap brim and a key rod. Specifically: The key rod is used to contact the spring sheet or the elastic piezoelectric ceramic sheet; The button cap is exposed in the pressing area of ​​the upper shell, and the button is fixed in the housing by supporting the button cap brim with the lower surface of the upper shell.

21. The piezoelectric ceramic power generating device according to claim 20, characterized in that: If the pressing area adopts a key structure, the piezoelectric ceramic power generation device also includes a key, a driving member and an energy storage device. The key and the driving member are coupled through the energy storage device, and the driving device is used to contact the spring or elastic piezoelectric ceramic sheet.

22. The piezoelectric ceramic power generating device according to claim 21, characterized in that: The piezoelectric ceramic power generation device also includes a spring, which is nested outside the key rod, has one end abutting against the bottom of the key cap, and the other end abutting against the elastic piezoelectric ceramic sheet or the spring sheet.

23. The piezoelectric ceramic power generation device according to any one of claims 18 to 21, characterized in that: The elastic piezoelectric ceramic sheet specifically includes an upper piezoelectric ceramic sheet, a lower piezoelectric ceramic sheet and a substrate, wherein the upper piezoelectric ceramic sheet and the lower piezoelectric ceramic sheet are respectively arranged on the upper surface and the lower surface of the substrate, and the substrate is fixed on the base of the lower shell.

24. The piezoelectric ceramic power generation device according to any one of claims 18 to 21, characterized in that: In the piezoelectric ceramic power generation device, The spring sheet is located on the upper surface of the elastic piezoelectric ceramic sheet; or, The spring sheet is located below the elastic piezoelectric ceramic sheet and on the upper surface of the lower shell.

25. The piezoelectric ceramic power generating device according to claim 24, characterized in that: When the spring sheet is located on the upper surface of the elastic piezoelectric ceramic sheet, the piezoelectric ceramic power generation device further includes a pressure plate, and the pressure plate is further arranged between the spring sheet and the upper surface of the elastic piezoelectric ceramic sheet; wherein the spring sheet is fixed on the pressure plate.

26. The piezoelectric ceramic power generator according to claim 18, characterized in that: The spring sheet includes a first state in which the spring sheet stays when the force acting on the spring sheet is lower than a first preset force, and a second state in which the top of the arc of the spring sheet collapses rapidly when the force acting on the spring sheet is higher than the first preset force. In the second state, the spring sheet directly acts on the elastic piezoelectric ceramic sheet.

27. The piezoelectric ceramic power generating device according to claim 18, characterized in that: If the pressing area adopts a key structure, the piezoelectric ceramic power generation device also includes a key, and a gap is arranged between the key and the spring.

28. The piezoelectric ceramic power generator according to claim 18, characterized in that: The spring piece is located in the middle of the elastic piezoelectric ceramic sheet.

29. A piezoelectric ceramic power generation device, characterized in that: The piezoelectric ceramic power generation device includes an upper shell, a lower shell, an elastic piezoelectric ceramic sheet, a driving member, a first magnet group and a second magnet group. Specifically: The elastic piezoelectric ceramic sheet is fixed on the first base of the lower shell, wherein after the elastic piezoelectric ceramic sheet is fixed, the gap between the bottom plate of the lower shell and the elastic piezoelectric ceramic sheet provides a space for the elastic piezoelectric ceramic sheet to generate electricity; The first magnet group is fixed on the upper shell and coupled with the second magnet group fixed on the driving member; A pressing area is provided on the upper shell, and the pressing area is used to obtain an external force and transmit it to the driving member. The first magnet group is fixed on the upper shell, and the second magnet group is fixed on the driving member. When the external force is greater than a first preset force, the first magnet group and the second magnet group quickly separate from each other in a second state. After the driving member quickly moves along the direction of the external force, it hits the elastic piezoelectric ceramic sheet to generate electrical energy. After the driving member hits the elastic piezoelectric ceramic sheet, the distance between the first magnet and the second magnet can also be used to absorb the driving member back to the initial position through the magnetic adsorption force between the two.

30. The piezoelectric ceramic power generating device according to claim 29, characterized in that: The piezoelectric ceramic power generation device also includes: The first magnet group is a permanent magnet arranged at a preset position on the lower surface of the upper shell; the second magnet is a magnetic conductive member arranged on the upper surface of the driving member and corresponding to the permanent magnet; or, The first magnet group is a magnetic conductive member arranged at a preset position on the lower surface of the upper shell; the second magnet is a permanent magnet arranged on the upper surface of the driving member and corresponding to the magnetic conductive member; or The first magnet group is a permanent magnet arranged at a preset position on the lower surface of the upper shell; the second magnet is specifically a permanent magnet arranged on the upper surface of the driving member and corresponding to the magnetic conductive member; wherein, in the first magnet group and the second magnet group, the magnetic poles of the permanent magnets facing each other are opposite.

31. The piezoelectric ceramic power generating device according to claim 29, characterized in that: The piezoelectric ceramic power generation device also includes a button, specifically: The bottom of the button is fixed to the upper surface of the driving member; The upper surface of the key is exposed in the pressing area of ​​the upper shell, and the initial state of the key is fixed by the magnetic adsorption force between the first magnet group fixed on the lower surface of the upper shell and the second magnet group arranged on the driving member.

32. The piezoelectric ceramic power generating device according to claim 29, characterized in that: The piezoelectric ceramic power generation device also includes a spring, and the driving member is specifically a structure with the spring storage groove arranged in the middle and a first magnetic conductive outer ring coupled to the second magnet; when the driving member collides with the elastic piezoelectric ceramic sheet, the spring is completely retracted into the storage groove.

33. The piezoelectric ceramic power generating device according to claim 29, characterized in that: The piezoelectric ceramic power generation device further includes a key, and the key includes a key cap, a key brim and a key rod, wherein at least two undercuts are provided at the end of the key brim, specifically: The bottom of the key rod or the driving member is used to contact the elastic piezoelectric ceramic sheet; The upper surface of the driving member is provided with a first through hole for passing the key rod, and is also provided with an auxiliary through hole for arranging the at least two undercuts; After at least two undercuts of the button brim pass through the auxiliary through hole, the side arms of the button brim and the auxiliary through hole form a radially movable range of the button relative to the driving member; wherein a force storage spring is provided in the space formed by the button brim, the button rod and the upper surface of the driving member.

34. A structure based on piezoelectric ceramic power generation, characterized in that: The piezoelectric ceramic power generation device comprises any one of claims 1 to 33, as well as a rectifier module, an energy storage device and a wireless module, specifically: The energy generated by the piezoelectric ceramic power generation device reaches the energy storage device through the rectifier module; The wireless module is connected to the energy storage device and is used to send a wireless control signal after obtaining power from the energy storage device.

35. The structure based on piezoelectric ceramic power generation according to claim 34, characterized in that: It also includes a control device, which is connected to the wireless module and the energy storage device respectively to prepare the data and work flow required by the wireless transmission module.

36. The structure based on piezoelectric ceramic power generation according to claim 34, characterized in that: It also includes a voltage conversion device, which is connected between the energy storage device and the wireless module and is used to convert the voltage of the energy storage device into the voltage required by the wireless module.

37. The structure based on piezoelectric ceramic power generation according to claim 34, characterized in that: It also includes a transmission device for transmitting the actions of at least two keys to the same elastic piezoelectric ceramic sheet.

38. The structure based on piezoelectric ceramic power generation according to claim 35 or 36, characterized in that: It also includes a transmission device for transmitting the actions of at least two keys to the same elastic piezoelectric ceramic sheet.

39. The structure based on piezoelectric ceramic power generation according to claim 35, characterized in that: It also includes at least one sensor connected to the control device for detecting the action of one or more keys being pressed and transmitting the detection data to the control device so that the control device can confirm the control signal corresponding to the pressed key.

40. The structure based on piezoelectric ceramic power generation according to claim 34, characterized in that: It includes at least two piezoelectric ceramic power generation devices and a matching number of keys, specifically: Each piezoelectric ceramic power generation device generates electricity when a corresponding key is pressed, and sends a wireless control signal matching the piezoelectric ceramic power generation device through the wireless module.

41. The structure based on piezoelectric ceramic power generation according to claim 35 or 36, characterized in that: It includes at least two piezoelectric ceramic power generation devices and a matching number of keys, specifically: Each piezoelectric ceramic power generation device generates electricity when a corresponding key is pressed, and sends a wireless control signal matching the piezoelectric ceramic power generation device through the wireless module.

42. The structure based on piezoelectric ceramic power generation according to claim 35, characterized in that: It also includes at least two identification modules, which are connected between the corresponding piezoelectric ceramic power generation device and the control device, and are used to feed back information that a designated key is pressed to the control device.

43. A piezoelectric ceramic power generation method, characterized in that: A piezoelectric ceramic power generating device comprising any one of claims 1 to 33, wherein the method comprises: gradually increasing the force, the force is applied to the energy storage device, and the energy storage device gradually accumulates the force; When the force exceeds the preset limit, the conversion device is triggered to act, and the moving part of the conversion device moves rapidly to hit the elastic piezoelectric ceramic sheet to generate electricity; The electric energy generated by the elastic piezoelectric ceramic sheet is provided to the wireless transmitting module to send a wireless signal.

44. The piezoelectric ceramic power generation method according to claim 43, characterized in that: A sensor is also included, and the method further includes: While triggering the piezoelectric ceramic to generate electricity, the sensor is also triggered to identify the specific key that is pressed among multiple keys.

45. The piezoelectric ceramic power generation method according to claim 44, characterized in that: It also includes a transmission device for transmitting the actions of at least two keys to the same piezoelectric ceramic power generation device.

46. ​​The piezoelectric ceramic power generation method according to claim 44, characterized in that: When one or more piezoelectric ceramic power generating devices among the plurality of piezoelectric ceramic power generating devices are triggered, the sensor is used to detect the specific key that is pressed.

47. The piezoelectric ceramic power generation method according to claim 43, characterized in that: Also includes an electric energy identification device, the method further includes: When one or more piezoelectric ceramic power generating devices among the plurality of piezoelectric ceramic power generating devices are triggered, the piezoelectric ceramic power generating device that is specifically triggered is detected through the electric energy identification device.

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