Charging structure based on piezoelectric vibrator and wearable intelligent device

Abstract

The utility model discloses a charging structure based on a piezoelectric vibrator. The charging structure comprises a switch device, a piezoelectric energy acquisition device and a piezoelectric driver. In a first working state, the piezoelectric vibrator is connected with a first contact of the switching device, the piezoelectric energy collecting device is connected with a second contact of the switching device, and the piezoelectric vibrator is conducted with the piezoelectric energy collecting device and used for charging the piezoelectric energy collecting device; and in a second working state, the piezoelectric vibrator is connected with the first contact of the switching device, the piezoelectric driver is connected with the third contact of the switching device, the piezoelectric vibrator is conducted with the piezoelectric driver, and the piezoelectric driver drives the piezoelectric vibrator to vibrate. When the power of the wearable intelligent device is insufficient, electric energy can be provided for the wearable intelligent device.

Description

Technical Field

[0001] The utility model relates to the field of piezoelectricity, and further relates to a charging structure based on a piezoelectric vibrator and a wearable intelligent device. Background Art

[0002] Currently, the function of micro vibration motors in most wearable smart devices is to produce vibration effects. Among them, piezoelectric motors (piezoelectric actuators) have the advantages of extremely short response time, high energy efficiency, and small size, and have attracted widespread attention.

[0003] In addition to the vibration experience, the forward piezoelectric effect of piezoelectric materials can generate electrical energy. This is helpful for emergency situations of low-power wearable devices. However, most products ignore this point. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a charging structure based on a piezoelectric vibrator and a wearable smart device, which can provide electrical energy when the wearable smart device is short of power.

[0005] Specifically, the technical solution of the utility model is as follows:

[0006] The utility model provides a charging structure based on a piezoelectric vibrator, comprising:

[0007] Switching devices, piezoelectric energy harvesting devices, and piezoelectric actuators;

[0008] A piezoelectric vibrator, in a first working state, the piezoelectric vibrator is connected to a first contact of the switch device, the piezoelectric energy harvesting device is connected to a second contact of the switch device, and the piezoelectric vibrator is connected to the piezoelectric energy harvesting device, so as to charge the piezoelectric energy harvesting device;

[0009] In the second working state, the piezoelectric vibrator is connected to the first contact of the switch device, the piezoelectric driver is connected to the third contact of the switch device, the piezoelectric vibrator is connected to the piezoelectric driver, and the piezoelectric driver drives the piezoelectric vibrator to vibrate.

[0010] The charging structure based on piezoelectric vibrator is applied to wearable smart devices, wherein the piezoelectric energy harvesting device in the charging structure is connected to the battery in the wearable smart device, and when the wearable smart device is short of power, an external force can be applied to the piezoelectric vibrator so that the electric energy generated by the piezoelectric vibrator enters the battery of the wearable smart device through the energy harvesting device, thereby providing electric energy for the wearable smart device. This enables the wearable smart device to be used normally under various environmental conditions, thereby improving the compatibility of the wearable smart device.

[0011] Furthermore, when the wearable smart device has sufficient power, the battery in the wearable smart device can be connected to the piezoelectric driver and the piezoelectric vibrator and provide power, so that the piezoelectric driver drives the piezoelectric vibrator to vibrate, providing the user with vibration needs, improving the user experience, and further improving the compatibility of the wearable smart device.

[0012] In some embodiments, the piezoelectric energy harvesting device comprises:

[0013] First inductor and battery;

[0014] An energy harvesting chip, wherein a first pin of the energy harvesting chip is connected to a first end of the piezoelectric vibrator, a second pin of the energy harvesting chip is connected to a second end of the piezoelectric vibrator, and a third pin of the energy harvesting chip is connected to the battery via the first inductor;

[0015] A first capacitor, wherein one end of the first capacitor is connected between the first inductor and the battery, and the other end is grounded.

[0016] In some embodiments, the energy harvesting chip comprises:

[0017] Filter circuit;

[0018] A rectifier, the rectifier is connected to the piezoelectric vibrator and is used to convert the alternating current generated by the piezoelectric vibrator into direct current;

[0019] a first field effect transistor, wherein a gate of the first field effect transistor is connected to the rectifier through the filter circuit, and a source of the first field effect transistor is connected to the first inductor;

[0020] A second field effect transistor, wherein a gate of the second field effect transistor is connected to the rectifier through the filter circuit, and a drain of the second field effect transistor is connected to the first inductor.

[0021] By selecting the rectifier as the rectifier bridge, the rectification efficiency is greatly improved, and a step-down circuit is provided to step down the voltage generated by the piezoelectric vibrator, thereby protecting the battery from damage and improving the compatibility of the charging structure based on the piezoelectric vibrator.

[0022] In some embodiments, the rectifier is a rectifier bridge.

[0023] In some embodiments, it further comprises:

[0024] A first power supply, a second capacitor and a first resistor;

[0025] The first pin of the piezoelectric driver is connected to the positive electrode of the first power supply, and the negative electrode of the first power supply is grounded;

[0026] a third field effect transistor, wherein a gate of the third field effect transistor is connected to the second pin of the piezoelectric driver via the second capacitor, and a drain of the third field effect transistor is connected to the piezoelectric vibrator;

[0027] A fourth field effect transistor, wherein the gate of the fourth field effect transistor is connected to the third pin of the piezoelectric driver, the source of the fourth field effect transistor is grounded through the first resistor, and the drain of the fourth field effect transistor is connected to the source of the third field effect transistor.

[0028] In some embodiments, the switch device comprises:

[0029] a first sub-switch and a second sub-switch;

[0030] One end of the first sub-switch is connected to the piezoelectric vibrator, and the other end is connected to the piezoelectric driver or the piezoelectric energy harvesting device;

[0031] One end of the second sub-switch is connected to the piezoelectric vibrator, and the other end is connected to the piezoelectric driver or the piezoelectric energy harvesting device.

[0032] In some embodiments, the piezoelectric vibrator is a piezoelectric ceramic or a piezoelectric crystal.

[0033] The utility model also provides a wearable intelligent device, comprising the charging structure based on the piezoelectric vibrator described in the above-mentioned embodiment.

[0034] The utility model also provides a smart watch, comprising: a dial, a watch strap, and the charging structure based on the piezoelectric vibrator described in the above embodiment arranged on the side wall of the dial.

[0035] In some embodiments, it further comprises:

[0036] A first button structure, wherein the first button structure is arranged on the side wall of the smart watch and is connected to the piezoelectric vibrator.

[0037] By setting the charging structure based on the piezoelectric vibrator at the overlap of the first button structure, the cost can be reduced, and the user experience and space utilization of the smart watch can be improved.

[0038] Compared with the prior art, the utility model has at least one of the following beneficial effects:

[0039] 1. The charging structure based on piezoelectric vibrator is applied to wearable smart devices, wherein the piezoelectric energy harvesting device in the charging structure is connected to the battery in the wearable smart device, and when the wearable smart device is short of power, an external force can be applied to the piezoelectric vibrator so that the electric energy generated by the piezoelectric vibrator enters the battery of the wearable smart device through the energy harvesting device, thereby providing electric energy for the wearable smart device. This allows the wearable smart device to be used normally under various environmental conditions, thereby improving the compatibility of the wearable smart device.

[0040] Furthermore, when the wearable smart device has sufficient power, the battery in the wearable smart device can be connected to the piezoelectric driver and the piezoelectric vibrator and provide power, so that the piezoelectric driver drives the piezoelectric vibrator to vibrate, providing the user with vibration needs, improving the user experience, and further improving the compatibility of the wearable smart device.

[0041] 2. The rectification efficiency is greatly improved by selecting the rectifier as the rectifier bridge, and a step-down circuit is set to step down the voltage generated by the piezoelectric vibrator, thereby protecting the battery from damage and improving the compatibility of the charging structure based on the piezoelectric vibrator.

[0042] 3. By setting the charging structure based on the piezoelectric vibrator at the overlap of the first button structure, the cost can be reduced, the user experience and the space utilization of the smart watch can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.

[0044] Figure 1 It is a structural diagram of an embodiment of a charging structure based on a piezoelectric vibrator of the utility model;

[0045] Figure 2 It is a structural diagram of an embodiment of a charging structure based on a piezoelectric vibrator of the utility model;

[0046] Figure 3 It is a circuit diagram of an energy harvesting chip of the utility model;

[0047] Figure 4 It is a structural diagram of another embodiment of a charging structure based on a piezoelectric vibrator of the utility model;

[0048] Figure 5 The utility model is a structural diagram of a smart watch. Description of the drawings:

[0050] Piezoelectric vibrator 100; switch device 200; piezoelectric driver 300; piezoelectric energy harvesting device 400; first sub-switch 210; second sub-switch 220; rectifier 310; filter circuit 320; first field effect transistor 330; second field effect transistor 340; first voltage 410; second capacitor 420; third field effect transistor 430; fourth field effect transistor 440; first key structure 510. DETAILED DESCRIPTION

[0051] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0052] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0053] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0054] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0055] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0056] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications should also be regarded as the protection scope of the utility model.

[0057] In one embodiment, Figure 1 As shown, the utility model provides a charging structure based on a piezoelectric vibrator, comprising:

[0058] Switching devices, piezoelectric energy harvesting devices, and piezoelectric actuators.

[0059] The piezoelectric vibrator, in a first working state, is connected to a first contact of the switch device, the piezoelectric energy harvesting device is connected to a second contact of the switch device, and the piezoelectric vibrator is connected to the piezoelectric energy harvesting device to charge the piezoelectric energy harvesting device.

[0060] In the second working state, the piezoelectric vibrator is connected to the first contact of the switch device, the piezoelectric driver is connected to the third contact of the switch device, the piezoelectric vibrator and the piezoelectric driver are turned on, and the piezoelectric driver drives the piezoelectric vibrator to vibrate.

[0061] In this embodiment, the first working state is to generate electrical energy through the piezoelectric vibrator (for example, the piezoelectric vibrator is a piezoelectric crystal or a piezoelectric ceramic) 100 to charge the piezoelectric energy harvesting device. The specific operation is to apply an external force to the piezoelectric vibrator 100 by pressing or other operations, so that the piezoelectric vibrator 100 generates current through the positive piezoelectric effect (in the absence of an electric field, when a force is applied to the piezoelectric vibrator in a certain direction to cause it to undergo mechanical deformation, polarization occurs inside it, and opposite charges appear on the two opposite surfaces. The larger the external force and the end area, the more charges appear. The sign of the end surface charge depends on the external force. When the external force is removed, the phenomenon of returning to an uncharged state is called the positive piezoelectric effect. When the direction of the force changes, the polarity of the charge also changes. If electrodes are installed on the two surfaces and connected with wires, the changing free charges will move from one plate to the other, forming a current). The piezoelectric vibrator 100 is connected to the first contact of the switch device 200, and the piezoelectric energy harvesting device 400 is connected to the second contact of the switch device 200, so that the piezoelectric vibrator 100 is connected to the piezoelectric energy harvesting device through the switch device 200, and the current generated by the piezoelectric vibrator 100 can enter the piezoelectric energy harvesting device 400 through the switch device 200 for charging.

[0062] Furthermore, the second working state is to drive the piezoelectric vibrator 100 to vibrate through the piezoelectric driver 300, wherein the vibration principle actually utilizes the inverse piezoelectric effect of the piezoelectric vibrator (when an electric field is applied in the polarization direction of the piezoelectric vibrator 100, the piezoelectric body will produce mechanical deformation or mechanical pressure in a certain direction. When the external electric field is removed, these deformations or pressures disappear. This phenomenon is called the inverse piezoelectric effect. The inverse piezoelectric effect is generated because when the piezoelectric crystal is subjected to the action of the electric field, stress is generated inside the crystal. This stress is called piezoelectric stress, and piezoelectric strain is generated through its action). The specific operation is that the piezoelectric vibrator 100 is connected to the first contact of the switch device 200, the piezoelectric driver 300 is connected to the third contact of the switch device 200, and the piezoelectric driver 300 is also connected to an external power supply. The external power supply provides electrical energy to the piezoelectric driver 300 and the piezoelectric vibrator 100, so that the piezoelectric driver 300 drives the piezoelectric vibrator to vibrate.

[0063] The piezoelectric vibrator-based charging structure in this embodiment is applied to a wearable smart device, wherein the piezoelectric energy harvesting device 400 in the charging structure is connected to the battery in the wearable smart device, and when the wearable smart device is short of power, an external force can be applied to the piezoelectric vibrator 100, so that the electric energy generated by the piezoelectric vibrator 100 enters the battery of the wearable smart device through the energy harvesting device 400, thereby providing electric energy for the wearable smart device. This allows the wearable smart device to be used normally under various environmental conditions, thereby improving the compatibility of the wearable smart device.

[0064] Furthermore, when the wearable smart device has sufficient power, the battery in the wearable smart device can be connected to the piezoelectric driver 300 and the piezoelectric vibrator 100 and provide power, so that the piezoelectric driver 300 drives the piezoelectric vibrator to vibrate, providing vibration requirements for the user, improving the user experience, and further improving the compatibility of the wearable smart device.

[0065] In one embodiment, Figure 2 As shown, the utility model provides a charging structure based on a piezoelectric vibrator. On the basis of the above embodiment, the piezoelectric energy harvesting device includes:

[0066] First the inductor and the battery.

[0067] An energy harvesting chip, wherein a first pin of the energy harvesting chip is connected to a first end of the piezoelectric vibrator, a second pin of the energy harvesting chip is connected to a second end of the piezoelectric vibrator, and a third pin of the energy harvesting chip is connected to a battery via a first inductor.

[0068] A first capacitor has one end connected between the first inductor and the battery, and the other end grounded.

[0069] In this embodiment, the piezoelectric energy harvesting device 400 specifically includes an energy harvesting chip (see attached Figure 2 LTC3588-1), the first inductor (refer to the attached Figure 2 The 10uH inductor in the Figure 2 The first pin of the energy harvesting chip (see attached Figure 2 Connect the piezoelectric vibrator (see Appendix Figure 2 MIDEV21BL is the attached Figure 1 The first end of the piezoelectric vibrator 100 in the energy collection chip and the second pin of the energy collection chip (see the attached Figure 2 The second end of the piezoelectric vibrator is connected to the third pin of the energy harvesting chip (see the attached Figure 2 SW in the figure) is connected to the output end of the energy harvesting device 400 through a first inductor (see the attached Figure 2 The output end of the energy harvesting device is connected to a battery (for example, the battery is an external power source, or a battery of a wearable smart device when this embodiment is applied to a wearable smart device). One end of the first capacitor is grounded, and the other end is connected between the first inductor and the battery.

[0070] Furthermore, when the piezoelectric vibrator generates current under external force, the current flows through the energy harvesting chip, the first inductor and the first capacitor, and finally enters the battery through the output end of the energy harvesting device 400 to charge the battery.

[0071] For further information, see Attachment Figure 3 In this embodiment, the energy harvesting chip specifically includes:

[0072] Filter circuit.

[0073] The rectifier is connected to the piezoelectric vibrator and is used to convert the alternating current generated by the piezoelectric vibrator into direct current.

[0074] A first field effect tube, a gate of the first field effect tube is connected to the rectifier through a filter circuit, and a source of the first field effect tube is connected to the first inductor.

[0075] A second field effect tube, a gate of the second field effect tube is connected to the rectifier through a filter circuit, and a drain of the second field effect tube is connected to the first inductor.

[0076] When an external force is applied to the piezoelectric vibrator (for example, a process of repeatedly pressing and releasing), since the voltage polarity generated by the piezoelectric vibrator is opposite, it is necessary to connect the rectifier 310 (the rectifier 310 in this embodiment is a rectifier bridge) in the energy harvesting chip to the piezoelectric vibrator through the first pin and the second pin of the energy harvesting chip to convert the first AC voltage generated by the piezoelectric vibrator into a first DC voltage. The rectifier 310 is also connected to the first field effect transistor 330 and the second field effect transistor 340 through the filter circuit 320, and the filter circuit is used to filter the rectified first DC voltage. At the same time, since the voltage generated by the piezoelectric vibrator is relatively high, it is necessary to connect the source of the first field effect transistor 330 to the attached Figure 2 The drain of the second field effect transistor 340 is connected to the first inductor in the Figure 2 The first field effect tube, the second field effect tube, the first inductor and the first capacitor together form a step-down circuit, which steps down the second DC voltage after rectification and filtering, and then inputs the stepped-down third DC voltage into the battery for charging.

[0077] In this embodiment, the voltage generated by the piezoelectric vibrator is rectified by the rectifier 310 to convert the first AC voltage into a first DC voltage, and the first DC voltage is filtered by the filter circuit 320 to produce a second DC voltage. Finally, the second DC voltage is stepped down by the step-down circuit to generate a third DC voltage required by the battery, and the battery is charged.

[0078] For further information, see Attachment Figure 2 In the energy harvesting device 400, in addition to the first capacitor, a plurality of third capacitors (for example, a 1uF capacitor, a 4.7uF capacitor, etc.) are also provided. The first capacitor and the third capacitor are also used to store energy generated by the voltage of the piezoelectric vibrator. When the energy is stored to a preset value (specifically, it can be set according to actual conditions), the battery is charged through the first capacitor and the third capacitor.

[0079] In this embodiment, the rectification efficiency is greatly improved by selecting the rectifier as the rectifier bridge, and a step-down circuit is provided to step down the voltage generated by the piezoelectric vibrator, thereby protecting the battery from damage and improving the compatibility of the charging structure based on the piezoelectric vibrator.

[0080] In one embodiment, Figure 4 As shown, the utility model provides a charging structure based on a piezoelectric vibrator, which, on the basis of the above embodiment, further includes:

[0081] A first power source, a second capacitor and a first resistor.

[0082] The first pin of the piezoelectric driver is connected to the positive electrode of the first power supply, and the negative electrode of the first power supply is grounded.

[0083] A third field effect tube, a gate of the third field effect tube is connected to the second pin of the piezoelectric driver through a second capacitor, and a drain of the third field effect tube is connected to the piezoelectric vibrator.

[0084] A fourth field effect tube, wherein the gate of the fourth field effect tube is connected to the third pin of the piezoelectric driver, the source of the fourth field effect tube is grounded through the first resistor, and the drain of the fourth field effect tube is connected to the source of the third field effect tube.

[0085] In this embodiment, the piezoelectric driver 300 (for example, Figure 4 The first pin of the MAX77501 in the figure is not limited to the piezoelectric driver and can be selected according to the actual situation (refer to the attached Figure 4 The positive electrode of the first power supply 410 is connected to the Vin in the figure. The negative electrode of the first power supply 410 is grounded. The first power supply 410 provides power to the piezoelectric driver 300. The second pin of the voltage driver 300 (see the attached Figure 4 The HS_G in the figure is connected to the gate of the third field effect transistor 430 through the second capacitor 420, and the drain of the third field effect transistor 430 is connected to the piezoelectric vibrator 100. The third pin of the voltage driver 300 (see the attached Figure 4 LS_G in the figure is connected to the gate of the fourth field effect transistor 440, the source of the fourth field effect transistor 440 is grounded through the first resistor 450, and the drain of the fourth field effect transistor 440 is connected to the source of the third field effect transistor 430.

[0086] Further, when the second pin of the voltage driver 300 is connected to the third field effect transistor 430, and the third pin of the voltage driver 300 is not connected to the fourth field effect transistor 440, the voltage driver 300 outputs a high level; when the second pin of the voltage driver 300 is not connected to the third field effect transistor 430, and the third pin of the voltage driver 300 is connected to the fourth field effect transistor 440, the voltage driver 300 outputs a low level. Therefore, the voltage driver outputs an AC driving signal including high and low levels to the piezoelectric vibrator 100, and the piezoelectric vibrator 100 vibrates according to the AC driving signal.

[0087] In one embodiment, Figure 1 As shown, the utility model provides a charging structure based on a piezoelectric vibrator, and the switch device includes:

[0088] a first sub-switch and a second sub-switch.

[0089] One end of the first sub-switch is connected to the piezoelectric vibrator, and the other end is connected to the piezoelectric driver or the piezoelectric energy harvesting device.

[0090] One end of the second sub-switch is connected to the piezoelectric vibrator, and the other end is connected to the piezoelectric driver or the piezoelectric energy harvesting device.

[0091] In this embodiment, in the first working state, one end of the first sub-switch 210 is connected to the piezoelectric vibrator 100, and the other end is connected to the piezoelectric energy harvesting device 400; one end of the second sub-switch 220 is connected to the piezoelectric vibrator 100, and the other end is connected to the piezoelectric energy harvesting device 400. This makes the piezoelectric vibrator 100 and the piezoelectric energy harvesting device 400 conductive, and charges the piezoelectric energy harvesting device 400.

[0092] In the second working state, one end of the first sub-switch 210 is connected to the piezoelectric vibrator 100, and the other end is connected to the piezoelectric driver 300; one end of the second sub-switch 220 is connected to the piezoelectric vibrator 100, and the other end is connected to the piezoelectric driver 300. The piezoelectric vibrator 100 and the piezoelectric driver 300 are connected, and the piezoelectric driver 300 is charged to drive the piezoelectric vibrator 100 to vibrate.

[0093] In one embodiment, the utility model provides a wearable intelligent device, comprising the charging structure based on piezoelectric vibrator described in the above embodiment.

[0094] In one embodiment, the utility model provides a smart watch, including a dial, a watch strap, and the charging structure based on the piezoelectric vibrator described in the above embodiment arranged on the side wall of the dial. Figure 5 In this embodiment, the piezoelectric vibrator-based charging structure is correspondingly arranged at the first button structure 510 on the side wall of the dial, and the piezoelectric vibrator 100 is connected to the first button structure. The working state of the piezoelectric vibrator-based charging structure is switched by the first button structure 510. Under normal circumstances, the piezoelectric vibrator-based charging structure is in the second working state (i.e., refer to the attached Figure 1 In the embodiment, the piezoelectric driver 300 drives the piezoelectric vibrator 100 to vibrate). When the power of the smart watch is insufficient, the first key structure 510 is pressed for a first preset time (for example, the first preset time is 10s) to switch to the first working state (see the attached Figure 1 , the piezoelectric vibrator 100 charges the piezoelectric energy harvesting device 400), and the electric energy generated by pressing the piezoelectric vibrator 100 is used to charge the smart watch battery.

[0095] Furthermore, a second button structure is provided for switching the working state of the charging structure based on the piezoelectric vibrator, or a communication interface is added to the charging structure based on the piezoelectric vibrator, and is connected to the smart watch for communication, and the working state of the charging structure based on the piezoelectric vibrator is switched through the display screen of the smart watch. When the smart watch is low on power or turned off, the communication interface switches to the first working state by default.

[0096] By setting the charging structure based on the piezoelectric vibrator at the overlapping position of the first button structure 510, the cost can be reduced, and the user experience and space utilization of the smart watch can be improved.

[0097] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications should also be regarded as the protection scope of the utility model.

Claims

1. A charging structure based on a piezoelectric vibrator, characterized in that: include: Switching devices, piezoelectric energy harvesting devices, and piezoelectric actuators; A piezoelectric vibrator, wherein the piezoelectric vibrator is connected to a first contact of the switch device, the piezoelectric energy harvesting device is connected to a second contact of the switch device, and the piezoelectric driver is connected to a third contact of the switch device; In the first working state, the piezoelectric vibrator is connected to the piezoelectric energy harvesting device to charge the piezoelectric energy harvesting device; In a second working state, the piezoelectric vibrator is connected to the piezoelectric driver, and the piezoelectric driver drives the piezoelectric vibrator to vibrate.

2. The charging structure based on piezoelectric vibrator according to claim 1, characterized in that: The piezoelectric energy harvesting device comprises: First inductor and battery; An energy harvesting chip, wherein a first pin of the energy harvesting chip is connected to a first end of the piezoelectric vibrator, a second pin of the energy harvesting chip is connected to a second end of the piezoelectric vibrator, and a third pin of the energy harvesting chip is connected to the battery via the first inductor; A first capacitor, wherein one end of the first capacitor is connected between the first inductor and the battery, and the other end is grounded.

3. The charging structure based on piezoelectric vibrator according to claim 2, characterized in that: The energy harvesting chip comprises: Filter circuit; A rectifier, the rectifier is connected to the piezoelectric vibrator and is used to convert the alternating current generated by the piezoelectric vibrator into direct current; a first field effect transistor, wherein a gate of the first field effect transistor is connected to the rectifier through the filter circuit, and a source of the first field effect transistor is connected to the first inductor; A second field effect transistor, wherein a gate of the second field effect transistor is connected to the rectifier through the filter circuit, and a drain of the second field effect transistor is connected to the first inductor.

4. The charging structure based on piezoelectric vibrator according to claim 3, characterized in that: The rectifier is a rectifier bridge.

5. The charging structure based on piezoelectric vibrator according to claim 1, characterized in that: Also includes: A first power supply, a second capacitor and a first resistor; The first pin of the piezoelectric driver is connected to the positive electrode of the first power supply, and the negative electrode of the first power supply is grounded; a third field effect transistor, wherein a gate of the third field effect transistor is connected to the second pin of the piezoelectric driver via the second capacitor, and a drain of the third field effect transistor is connected to the piezoelectric vibrator; A fourth field effect transistor, wherein the gate of the fourth field effect transistor is connected to the third pin of the piezoelectric driver, the source of the fourth field effect transistor is grounded through the first resistor, and the drain of the fourth field effect transistor is connected to the source of the third field effect transistor.

6. The charging structure based on piezoelectric vibrator according to claim 1, wherein the switch device comprises: a first sub-switch and a second sub-switch; One end of the first sub-switch is connected to the piezoelectric vibrator, and the other end is connected to the piezoelectric driver or the piezoelectric energy harvesting device; One end of the second sub-switch is connected to the piezoelectric vibrator, and the other end is connected to the piezoelectric driver or the piezoelectric energy harvesting device.

7. The charging structure based on piezoelectric vibrator according to any one of claims 1 to 6, characterized in that: The piezoelectric vibrator is a piezoelectric ceramic or a piezoelectric crystal.

8. A wearable smart device, characterized in that: A charging structure based on a piezoelectric vibrator comprising any one of claims 1 to 7.

9. The wearable smart device according to claim 8, characterized in that: The wearable smart device is a smart watch.

10. The wearable smart device according to claim 9, characterized in that: The smart watch further includes: A first button structure, wherein the first button structure is arranged on the side wall of the smart watch and is connected to the piezoelectric vibrator.

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