Wireless energy-data transmission system based on piezoelectric-electromagnetic coupling

Abstract

The invention discloses a wireless energy-data transmission system based on piezoelectric-electromagnetic coupling, and the system is characterized in that an energy transmitting device can control the current of each coil according to the position change of an energy receiving device based on an electromagnetic array energy transmitting end and an array management circuit, and improves the capability of resisting misalignment and other disturbances of the system; a piezoelectric cantilever beam energy receiving end in the energy receiving device can perform piezoelectric-electromagnetic coupling to realize wireless energy transmission from the energy transmitting device to the energy receiving device, and an energy storage and management circuit realizes energy storage and supply so as to continuously and autonomously monitor main parameters of a system to be monitored; and reverse data transmission from the energy receiving device to the energy transmitting device is realized by using the data transmitting and receiving circuit, so that monitoring data of the sensor is transmitted to the outside of an object to be measured, and autonomous operation of the sensing system is realized. The system has the advantages of small volume, low power consumption and high energy volume density, and is suitable for wireless energy transmission and wireless data transmission in a volume-limited scene.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless energy and data transmission, and particularly relates to a wireless energy-data transmission system based on piezoelectric-electromagnetic coupling. Background Art

[0002] With the rapid development and popularization of the Internet of Things and wireless sensing technologies, the applications of sensing systems are becoming increasingly widespread and the scale is growing day by day. The demand for low power consumption and long-term sustainable operation is also increasing day by day. Special application scenarios such as structural monitoring and implantable medical require that their sensing and power supply systems are small in size, low in power consumption, do not require battery replacement, can operate wirelessly and autonomously and sustainably, and have good safety and stability. However, the current traditional battery power supply method has problems such as the need for frequent charging or battery replacement, as well as the deficiencies of being difficult to miniaturize and unable to operate autonomously and sustainably for a long time, which limit the wider and more comprehensive application of wireless sensing systems.

[0003] At the same time, current wireless energy-data transmission systems generally require strict alignment to ensure transmission efficiency and lack optimization of energy transmission for the position of the receiving end. In actual sensing and monitoring applications, the position of the object to be measured usually changes at any time, resulting in a significant reduction in the energy transmission efficiency of the system. Therefore, by designing for the energy transmitting end and specifically optimizing the electromagnetic field generated by the electromagnetic transmitting end for the change in the position of the receiving end to improve the energy transmission efficiency, the transmission range of the existing wireless sensing system can be improved, promoting wider applications.

[0004] Currently, compared with traditional electromagnetic methods, piezoelectric energy receivers have better energy volume density and lower operating frequencies, and can achieve smaller volume occupancy when transmitting the same amount of energy. At the same time, piezoelectric materials generate mechanical waves. Compared with the electromagnetic waves generated by electromagnetic methods, piezoelectric energy receivers have better anti-electromagnetic interference capabilities, improving system stability. Therefore, designing the piezoelectric energy receiving end, coupling the electromagnetic transmitting end with the piezoelectric receiving end, combining the advantages of the two methods, improving the output stability of low-frequency energy transmission of the system, and realizing the continuous and autonomous operation of the wireless sensing system have good application prospects. Summary of the Invention

[0005] The present invention provides a wireless energy-data transmission system based on piezoelectric-electromagnetic coupling, which can perform wireless energy transmission and wireless data transmission in a volume-limited scenario, improve the system's ability to resist disturbances such as misalignment, and achieve long-term sustainable and autonomous operation of the system.

[0006] To achieve the above object, the present invention adopts the following specific technical solutions:

[0007] A wireless energy-data transmission system based on piezoelectric-electromagnetic coupling, which includes an energy transmitting device located outside the object to be measured and an energy receiving device located inside the object to be measured;

[0008] The energy transmitting device includes an electromagnetic array energy transmitting-data receiving end, an array management circuit, a data receiving circuit, and a power supply; the electromagnetic array energy transmitting-data receiving end is used to generate an electromagnetic field and receive data signals through the electromagnetic array; the data receiving circuit is used to process the data signals received by the electromagnetic array energy transmitting-data receiving end; the array management circuit is connected to the electromagnetic array energy transmitting-data receiving end and the data receiving circuit, and is used to control the magnetic field distribution of the electromagnetic array and send the data signals processed by the data receiving circuit; the power supply is used to provide electrical energy for the electromagnetic array energy transmitting-data receiving end, the array management circuit, and the data receiving circuit;

[0009] The energy receiving device includes a piezoelectric cantilever beam energy receiving-data sending end, an energy storage and management circuit, a data sending circuit, and a sensor; the piezoelectric cantilever beam energy receiving-data sending end is used to generate electrical energy through the magnetic field generated by the electromagnetic array energy transmitting-data receiving end; the energy storage and management circuit is used to store and manage the electrical energy generated by the piezoelectric cantilever beam energy receiving-data sending end and deliver the electrical energy to the sensor and the data sending circuit; the sensor is used to monitor the parameters of the object to be measured and output the monitored information to the data sending circuit.

[0010] Furthermore, the electromagnetic array energy transmitting-data receiving end is composed of a large square hollow electromagnetic coil and multiple small square hollow electromagnetic coils;

[0011] The small square hollow electromagnetic coils are all located in the hollow area of the large square hollow electromagnetic coil and are centrosymmetrically distributed with respect to the geometric center of the large square hollow electromagnetic coil, thereby reducing the volume of the energy transmitting device.

[0012] Furthermore, the power supply includes a DC power supply and a voltage amplification module;

[0013] The voltage amplification module is used to drive the small square hollow electromagnetic coil and the large square hollow electromagnetic coil to generate a specified voltage;

[0014] Each of the small square hollow electromagnetic coil and the large square hollow electromagnetic coil is connected with a current limiting resistor for ensuring the safe operation of the energy transmitting device.

[0015] Furthermore, the array management circuit has a microprocessor;

[0016] The microprocessor outputs an adjustable voltage excitation signal to each of the small square hollow electromagnetic coils and the large square hollow electromagnetic coil, for adjusting the magnitude and phase of the current flowing through each of the small square hollow electromagnetic coils and the large square hollow electromagnetic coil;

[0017] The data receiving circuit shares the microprocessor with the array management circuit, and is used for transmitting a data signal to the microprocessor.

[0018] Further, the piezoelectric cantilever energy receiving-data transmitting end includes a composite piezoelectric sheet, a spacer and a magnet;

[0019] Both the composite piezoelectric sheet and the spacer are thin sheets, and are tightly bonded using an epoxy resin adhesive; the composite piezoelectric sheet is used for energy reception and data transmission;

[0020] The spacer is made of a high-rigidity metal material; the magnets are symmetrically distributed on the upper and lower sides at one end of the spacer.

[0021] Further, the side length of the large square hollow electromagnetic coil is equal to the length of the long side of the composite piezoelectric sheet;

[0022] The side length of the magnet is smaller than the side length of the short side of the composite piezoelectric sheet.

[0023] Further, the energy storage and management circuit has a sleep mode, and allows the maximum input voltage to be higher than the maximum output voltage of the piezoelectric cantilever energy receiving-data transmitting end.

[0024] Further, the energy emitting device further includes an emitting housing;

[0025] The electromagnetic array energy emitting-data receiving end, the array management circuit, the data receiving circuit and the power supply are installed in the emitting housing;

[0026] The electromagnetic array energy emitting-data receiving end is located at the inner bottom of the emitting housing;

[0027] The emitting housing can pass through mechanical waves and electromagnetic waves, and has good biocompatibility.

[0028] Further, the data sending circuit includes a waveform generating module and a frequency dividing circuit; the waveform generating module is used for generating a waveform of a specified frequency; the frequency dividing circuit performs frequency division according to the high and low of the data level to be sent.

[0029] Furthermore, the frequency of the waveform generation module is consistent with the natural frequency of the piezoelectric cantilever beam energy receiving-data transmitting end acting as an actuator.

[0030] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0031] 1. The wireless energy-data transmission system of the present invention can effectively reduce the sizes of the energy transmitting device and the energy receiving device through the electromagnetic array energy transmitting end and the piezoelectric cantilever beam energy receiving end, making the volume of both less than 5 cm. 3 ; The design of the piezoelectric cantilever beam structure effectively reduces the system energy resonance frequency to below 100 Hz. At the same time, due to the relatively high natural frequency of the piezoelectric actuator, a data transmission rate of kbps level can be achieved, realizing good wireless energy and data transmission effects, and effectively expanding the application scope of wireless sensor nodes. Therefore, the device has a small volume, a low energy resonance frequency, and a high data transmission rate, and is suitable for complex environment monitoring scenarios with limited volume.

[0032] 2. The wireless energy-data transmission system of the present invention can reconstruct the magnetic field distribution of the transmitting end according to the position change of the receiving end through the array management circuit and the electromagnetic array, improving the received energy effect and effectively enhancing the anti-misalignment ability of the system; at the same time, by using the piezoelectric energy receiving end and data transmitting end, changing the electromagnetic coupling to piezoelectric-electromagnetic coupling reduces the electromagnetic interference of the system and improves the system stability. Therefore, the anti-misalignment and other interference resistance ability is strong and the stability is good.

[0033] 3. Since the piezoelectric cantilever beam energy has lower loss compared with the electromagnetic receiving end, and at the same time, through the low-power energy storage and management circuit, the waveform generation module and the sleep mode when there is no monitoring task, the power consumption of the energy receiving device is effectively reduced; at the same time, the piezoelectric receiving end has a high energy volume density, which can ensure the energy transmission effect. Through the charge and discharge regulation of the energy management module, it can supply power to the wireless sensing system for a long time, realizing the long-term autonomous operation of the system; therefore, the wireless energy-data transmission system of the present invention has low power consumption and can achieve long-term autonomous operation. Description of the Drawings

[0034] Figure 1 It is the overall schematic diagram of the wireless energy-data transmission system of the present invention.

[0035] Figure 2 It is the composition diagram of the energy transmitting device.

[0036] Figure 3 It is the composition diagram of the energy receiving device.

[0037] Figure 4 It is the flowchart of the working process.

[0038] Figure 5 It is a flowchart of the working process of the array management circuit and the electromagnetic array energy transmitting end.

[0039] Reference numerals: 1 - energy transmitting device, 2 - energy receiving device, 3 - electromagnetic array energy transmitting - data receiving end, 401 - power supply, 402 - array management circuit, 403 - data receiving circuit, 501 - composite piezoelectric sheet, 502 - gasket, 503 - magnet, 601 - energy storage and management circuit, 602 - data sending circuit, 7 - sensor. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] As Figure 1 As shown in the structure, the embodiment of the present invention provides a wireless energy - data transmission system based on piezoelectric - electromagnetic coupling. The wireless energy - data transmission system includes an energy transmitting device 1 located outside the object to be measured and an energy receiving device 2 located inside the object to be measured, which is used to realize wireless energy transmission from the energy transmitting device 1 to the energy receiving device 2 and wireless data transmission from the energy receiving device 2 to the energy transmitting device 1.

[0042] As Figure 2As shown, the energy emission device 1 includes an emission housing (not shown in the figure), an electromagnetic array energy emission-data receiving end 3, an array management circuit 402, a data receiving circuit 403, and a power supply 401; the electromagnetic array energy emission-data receiving end 3, the array management circuit 402, the data receiving circuit 403, and the power supply 401 are installed in the emission housing; the electromagnetic array energy emission-data receiving end 3 serves as an energy emission end and a data receiving end and is located at the bottom inside the emission housing; the emission housing can pass through mechanical waves and electromagnetic waves and has good biocompatibility. The electromagnetic array energy emission-data receiving end 3 is connected to the data receiving circuit 403 and is used to generate an electromagnetic field and receive data signals through the electromagnetic array; the data receiving circuit 403 is used to process the data signals received by the electromagnetic array energy emission-data receiving end 3 and has functions such as data processing and demodulation. After the electromagnetic array receives the data signals, the data is transmitted to the microprocessor and finally sent to external devices such as a host computer for storage and display. The array management circuit 402 is connected to the electromagnetic array energy emission-data receiving end 3 and the data receiving circuit 403 and is used to control the magnetic field distribution of the electromagnetic array and send the data signals processed by the data receiving circuit 403; the power supply 401 is used to supply electrical energy to the electromagnetic array energy emission-data receiving end 3, the array management circuit 402, and the data receiving circuit 403.

[0043] As Figure 3As shown, the energy receiving device 2 includes a receiving housing (not shown in the figure), a piezoelectric cantilever energy receiving-data transmitting end, an energy storage and management circuit 601, a data transmitting circuit 602, and a sensor 7; the piezoelectric cantilever energy receiving-data transmitting end, the energy storage and management circuit 601, the data transmitting circuit 602, and the sensor 7 are installed inside the receiving housing; the piezoelectric cantilever energy receiving-data transmitting end serves as an energy receiving end and a data transmitting end, and is used to generate electrical energy through the magnetic field generated by the electromagnetic array energy transmitting-data receiving end 3; the energy storage and management circuit 601 is connected to the output end of the piezoelectric cantilever energy receiving-data transmitting end, and is used to store and manage the electrical energy generated by the piezoelectric cantilever energy receiving-data transmitting end, and also needs to deliver the electrical energy to the sensor 7 and the data transmitting circuit 602; the sensor 7 is connected to both the data transmitting circuit 602 and the energy storage and management circuit 601, monitors the parameters of the object to be measured through the energy provided by the energy storage and management circuit 601, and outputs in binary data, so as to output the monitored information to the data transmitting circuit 602. The energy storage and management circuit 601 has a sleep mode, has a low power consumption when monitoring is not required, has a wide input range, and allows the maximum input voltage to be higher than the maximum output voltage of the piezoelectric cantilever energy receiving-data transmitting end, can store the received energy safely and stably, and at the same time has a good output voltage (such as 3.3V), which can be used as the power supply voltage of the sensor 7. When the stored energy is full, it can discharge to the sensor 7 to enable the sensor 7 to start monitoring work. After that, when discharging to a certain extent, the energy storage and management circuit 601 switches to the charging mode until it is full, and runs in this cycle to achieve the long-term autonomous operation of the system. The data transmitting circuit 602 is connected to the output end of the piezoelectric cantilever energy receiving-data transmitting end, and has a waveform generating module with a waveform generating function. Through prior programming, it can generate a waveform with a specified frequency; the frequency of the waveform generating module is consistent with the natural frequency of the piezoelectric cantilever energy receiving-data transmitting end as an actuator. At the same time, the data transmitting circuit 602 has a frequency division circuit, which can selectively perform frequency division according to the level of the data to be transmitted. Utilizing the frequency characteristics of the piezoelectric sheet as an actuator, taking the natural characteristics of the piezoelectric actuator as the high level and the frequency-divided signal as the low level, based on the characteristics of the piezoelectric sheet and the frequency shift keying method, "0" and "1" can be significantly distinguished, thereby realizing wireless data transmission from the energy receiving device 2 to the energy transmitting device 1, and can transmit the specified data required when the piezoelectric sheet transmits data outside the object to be measured, realizing wireless data transmission with a high code rate.

[0044] As Figure 2As shown, the above electromagnetic array energy transmitting-data receiving end 3 is composed of a large-sized large square hollow electromagnetic coil and multiple small-sized small square hollow electromagnetic coils of the same specification; the small square hollow electromagnetic coils are all located within the hollow area of the large square hollow electromagnetic coil and are centrosymmetrically distributed with respect to the geometric center of the large square hollow electromagnetic coil, thereby reducing the volume of the energy transmitting device 1. The power supply 401 includes a DC power supply 401 and a voltage amplification module; the voltage amplification module is used to drive the small square hollow electromagnetic coil and the large square hollow electromagnetic coil to generate a specified voltage; a current limiting resistor for ensuring the safe operation of the energy transmitting device 1 is connected to each of the small square hollow electromagnetic coils and the large square hollow electromagnetic coil.

[0045] The array management circuit 402 has a microprocessor; the microprocessor can output multiple adjustable excitation signals, and each excitation signal is connected to one of the coils of the electromagnetic array, that is, the microprocessor outputs an adjustable voltage excitation signal to each of the small square hollow electromagnetic coils and the large square hollow electromagnetic coil, for adjusting the magnitude and phase of the current flowing through each of the small square hollow electromagnetic coils and the large square hollow electromagnetic coil. Through the microprocessor of the array management circuit 402, the output of each channel can be controlled, the magnitude and phase of the current flowing through each coil can be changed, and the magnetic field distribution of the electromagnetic array can be changed according to parameter changes such as the position of the energy receiving end, realizing the ability to resist disturbances such as misalignment; the data receiving circuit 403 shares a microprocessor with the array management circuit 402 and is used to transmit the data signal to the microprocessor.

[0046] As Figure 3 shown, the piezoelectric cantilever beam energy receiving-data transmitting end includes a composite piezoelectric sheet 501, a spacer 502, and a magnet 503; the composite piezoelectric sheet 501 has the functions of both a sensor 7 and an actuator, and thus can be applied to both energy receiving and data transmitting. The composite piezoelectric sheet 501 and the spacer 502 are both thin sheets and are tightly bonded using an epoxy resin adhesive; the composite piezoelectric sheet 501 is used for energy receiving and data transmitting; the spacer 502 is made of a high-rigidity metal material; magnets 503 are symmetrically distributed on the upper and lower sides at one end of the spacer 502; the cantilever beam structure thus formed not only realizes a low-frequency energy transmission resonance frequency but also strengthens the output voltage, improving the energy transmission effect. The composite piezoelectric sheet 501 is a rectangular thin sheet, and the rectangular cross-section has a long side and a short side; the side length of the large square hollow electromagnetic coil is equal to the length of the long side of the composite piezoelectric sheet 501; the side length of the magnet 503 is less than the side length of the short side of the composite piezoelectric sheet 501.

[0047] Before assembling the above system, the piezoelectric cantilever beam energy receiving end structure should be assembled first. The composite material piezoelectric sheet 501 should be used as both an actuator and a sensor 7, and should have a thin and light appearance. The composite material piezoelectric sheet 501 and the gasket 502 are tightly attached by epoxy resin adhesive, and two magnets 503 are symmetrically placed on the upper and lower sides of one end of the gasket 502. Finally, one end of the gasket 502 is clamped with an appropriate object to form the entire piezoelectric cantilever beam.

[0048] After the piezoelectric cantilever is constructed, the performance of the piezoelectric sheet as a sensor 7 and actuator is first tested. For the performance of the sensor 7, only the large coil in the electromagnetic array energy transmitter-data receiver 3 is used as the transmitter, without connecting other devices, and the entire piezoelectric cantilever is used as the receiver. At the same time, a signal generator is used to generate a sine wave for wireless energy transmission. After that, the amplitude of the generated signal is not adjusted, and a frequency sweep operation is performed to observe the change of the received voltage at the receiving end of the piezoelectric cantilever, record the maximum energy receiving voltage, and use this frequency as the frequency of the output signal of the array management circuit 402.

[0049] For the performance test of the actuator, a high-frequency sine wave is directly passed through both ends of the piezoelectric sheet. The amplitude of the sine wave should be within the normal operating voltage range of the actuator. The piezoelectric cantilever beam is used as the data transmitter, and only the large coil is used as the data receiver. After that, only the frequency sweep operation is performed, and the frequency corresponding to the maximum data receiving voltage is recorded.

[0050] Then the data transmission circuit 602 is burned, the natural frequency of the piezoelectric film when used as an actuator is used as the generated frequency, the code is written and burned using a microprocessor, etc., so that the waveform generation module outputs a sine wave of this frequency.

[0051] Then, a larger square hollow electromagnetic coil and a plurality of smaller square hollow electromagnetic coils of the same specification are selected, wherein the side length of the larger coil should be equal to the length of the longer side of the piezoelectric film. The smaller coils are placed in the hollow of the larger coil, so that the whole is centrally symmetrically distributed with respect to the geometric center of the larger coil, and the smaller coils occupy most of the area of the hollow of the larger coil, so as to form an electromagnetic array energy transmitting-data receiving terminal 3.

[0052] Then, the electromagnetic array energy transmitting-data receiving terminal 3, the power supply 401, the array management circuit 402 and the data receiving circuit 403 are installed in the transmitting shell of the energy transmitting device 1, wherein the electromagnetic array should be located at the bottom of the energy transmitting device 1, and the array management circuit 402 and the data receiving circuit 403 should be connected to the electromagnetic array respectively, thereby forming the following Figure 2 The energy transmitting device 1 is shown.

[0053] Meanwhile, the composite piezoelectric sheet 501, gasket 502, magnet 503, energy storage and management circuit 601, data transmission circuit 602, and sensor 7 are placed into the receiving housing of the energy receiving device 2. Among them, the piezoelectric cantilever energy receiving end and sensor 7 are respectively connected to the energy storage and management circuit 601 and data transmission circuit 602. The piezoelectric cantilever energy receiving end is parallel to the plane where the electromagnetic array is located, and the central axis of the magnet 503 should be substantially coincident with the central axis of the electromagnetic array. Finally, the energy receiving device 2 is placed into the object to be measured, thus forming the energy receiving device 2 as shown in Figure 3 shown.

[0054] As Figure 4 shown, the working process of the entire wireless energy-data transmission system is as follows:

[0055] Each time when starting to work, it should be ensured that the output voltage of the signal amplifier in the array management circuit 402 has no bias, and at the same time, it should be ensured that the energy transmitting device 1 is in good position, thus completing the initialization work. The array management circuit 402 outputs each signal excitation voltage to each electromagnetic coil, and thus the electromagnetic array generates a time-varying electromagnetic field. The permanent magnet 503 on the piezoelectric cantilever energy receiving end senses this magnetic field and generates an electromagnetic force. The piezoelectric cantilever is forced to vibrate due to this force and generates a displacement, and further the composite piezoelectric sheet 501 is subjected to pressure, generating a piezoelectric effect, converting mechanical energy into electric potential energy across the piezoelectric layer. Thus, the piezoelectric-electromagnetic coupling can generate a voltage across the two ends of the energy receiving device 2, and further enable the energy to be transmitted to the energy receiving device 2, realizing wireless energy transmission. Since the piezoelectric cantilever can achieve energy transmission with small volume and high volume density, the miniaturization of the system can be realized.

[0056] To improve the ability of the system to resist disturbances such as misalignment, the magnetic field generated by the electromagnetic array can be reconstructed by controlling the array management circuit 402 in the energy transmitting device 1. The flowchart of the specific implementation of this process is as shown in Figure 5 shown. When the position parameters of the receiving end change, with the power-on state unchanged, the mutual inductance between each electromagnetic coil and the energy receiving device 2 changes. Thus, the array management circuit 402 obtains the change information of the position parameters by sensing the change of the mutual inductance. Then, the excitation signal output of the microprocessor is adjusted accordingly to adjust the magnitude and phase of the current flowing through each coil, changing the magnetic field generated by the coil, and realizing the reconstruction of the magnetic field generated by the electromagnetic array. After that, the mutual inductance information is detected again to see if it reaches the optimum, that is, whether the magnetic field has been completely aligned with the energy receiving device 2. If the mutual inductance does not reach the optimum, the excitation signal output needs to be readjusted. By continuously iteratively updating the output of the array management circuit 402, the magnetic field of the electromagnetic array can be optimized and adjusted specifically according to the position change of the energy receiving device 2, improving the energy transmission efficiency under system misalignment, so as to enhance the ability of the system to resist disturbances such as misalignment during wireless energy transmission.

[0057] When the piezoelectric cantilever beam receives wireless energy, it stores the energy through the energy storage and management circuit 601. The energy storage and management circuit 601 first charges. When the battery is fully charged, it provides electrical energy for the sensor 7, and thus the sensor 7 starts to monitor the main parameters of the object to be measured. When the battery power is insufficient due to the sensor 7 and data transmission, it will be recharged, and thus the charge and discharge cycle is carried out to realize the long-term autonomous operation of the wireless sensing system.

[0058] For wireless data transmission, first, the data generated by the sensor 7 is transmitted to the data sending circuit 602. The data sending circuit 602 contains a waveform generation module and a frequency division circuit, and is powered by the energy storage and management circuit 601. When the energy storage and management circuit 601 is in the discharge state, the data sending circuit 602 generates a specified waveform. When a high level needs to be transmitted, the waveform is directly connected to both ends of the piezoelectric element without passing through the frequency division circuit, and combined with the output characteristics of the piezoelectric actuator, a high level is output. When a low level needs to be transmitted, the waveform is connected to the piezoelectric element after passing through the frequency division circuit.

[0059] For the wireless transmission of data from the energy receiving device 2 to the energy transmitting device 1, after a voltage is provided across the piezoelectric element, the piezoelectric material generates mechanical vibration and stress due to the inverse piezoelectric effect after being energized. This stress causes the piezoelectric cantilever beam containing the magnet 503 to deflect. When the magnet 503 moves, a time-varying electromagnetic field is generated. This electromagnetic field is coupled to the coil in the electromagnetic array of the energy transmitting device 1 to transmit the data to the energy transmitting device 1. Finally, through the demodulation and other processing of the data receiving circuit 403, the data is transmitted to other devices such as a host computer for storage and display, thereby realizing the wireless data transmission from the sensor 7 to the outside of the object to be measured.

[0060] Combined with Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 , the wireless energy-data transmission system of the present invention can achieve small-volume and low-power wireless energy-data transmission in a complex background with limited volume, and can enable the wireless sensing system to operate autonomously for a long time.

[0061] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A wireless energy-data transmission system based on piezoelectric-electromagnetic coupling, characterized in that It includes an energy emission device located outside the object to be measured and an energy reception device located inside the object to be measured; The energy emission device includes an electromagnetic array energy emission - data reception terminal, an array management circuit, a data reception circuit, and a power supply; the electromagnetic array energy emission - data reception terminal is used to generate an electromagnetic field and receive data signals through the electromagnetic array; the data reception circuit is used to process the data signals received by the electromagnetic array energy emission - data reception terminal; The array management circuit is connected to the electromagnetic array energy emission - data reception terminal and the data reception circuit, and is used to control the magnetic field distribution of the electromagnetic array and send the data signals processed by the data reception circuit; the power supply is used to provide electrical energy for the electromagnetic array energy emission - data reception terminal, the array management circuit, and the data reception circuit; The energy reception device includes a piezoelectric cantilever beam energy reception - data transmission terminal, an energy storage and management circuit, a data transmission circuit, and a sensor; the piezoelectric cantilever beam energy reception - data transmission terminal is used to generate electrical energy through the magnetic field generated by the electromagnetic array energy emission - data reception terminal; The energy storage and management circuit is used to store and manage the electrical energy generated by the piezoelectric cantilever beam energy reception - data transmission terminal and deliver the electrical energy to the sensor and the data transmission circuit; The sensor is used to monitor the parameters of the object to be measured and output the monitored information to the data transmission circuit.

2. The wireless energy-data transmission system according to claim 1, wherein The electromagnetic array energy emission - data reception terminal is composed of a large square hollow electromagnetic coil and multiple small square hollow electromagnetic coils; The small square hollow electromagnetic coils are all located in the hollow area of the large square hollow electromagnetic coil and are centrally symmetrically distributed with respect to the geometric center of the large square hollow electromagnetic coil, thereby reducing the volume of the energy emission device.

3. The wireless energy-data transmission system according to claim 2, wherein The power supply includes a DC power supply and a voltage amplification module; The voltage amplification module is used to drive the small square hollow electromagnetic coil and the large square hollow electromagnetic coil to generate a specified voltage; Each of the small square hollow electromagnetic coils and the large square hollow electromagnetic coil is connected with a current - limiting resistor for ensuring the safe operation of the energy emission device.

4. The wireless energy-data transmission system according to claim 3, characterized in that, The array management circuit has a microprocessor; The microprocessor outputs an adjustable voltage excitation signal to each of the small square hollow electromagnetic coils and the large square hollow electromagnetic coil, for adjusting the magnitude and phase of the current flowing through each of the small square hollow electromagnetic coils and the large square hollow electromagnetic coil; The data reception circuit shares the microprocessor with the array management circuit and is used to transmit the data signal to the microprocessor.

5. The wireless energy-data transmission system according to claim 4, characterized in that, The piezoelectric cantilever beam energy reception - data transmission terminal includes a composite piezoelectric sheet, a gasket, and a magnet; The composite piezoelectric sheet and the gasket are both thin sheets and are closely bonded with an epoxy resin adhesive; the composite piezoelectric sheet is used for energy reception and data transmission; The gasket is made of a high - stiffness metal material; the magnets are symmetrically distributed on the upper and lower sides at one end of the gasket.

6. The wireless energy-data transmission system according to claim 5, wherein The side length of the large square hollow electromagnetic coil is equal to the length of the long side of the composite piezoelectric sheet; The side length of the magnet is less than the side length of the short side of the composite piezoelectric sheet.

7. The wireless energy-data transmission system according to claim 1, characterized in that, The energy storage and management circuit has a sleep mode, and the maximum allowable input voltage is higher than the maximum output voltage of the piezoelectric cantilever energy receiving-data sending end.

8. The wireless energy-data transmission system according to claim 1, characterized in that, The energy transmitting device further includes a transmitting housing; The electromagnetic array energy transmitting-data receiving end, the array management circuit, the data receiving circuit, and the power supply are installed in the transmitting housing; The electromagnetic array energy transmitting-data receiving end is located at the bottom inside the transmitting housing; The transmitting housing can pass through mechanical waves and electromagnetic waves and has good biocompatibility.

9. The wireless energy-data transmission system according to any one of claims 1-8, characterized in that, The data sending circuit includes a waveform generation module and a frequency division circuit; the waveform generation module is used to generate a waveform with a specified frequency; the frequency division circuit performs frequency division according to the high and low levels of the data level to be sent.

10. The wireless energy-data transmission system according to claim 9, characterized in that, The frequency of the waveform generation module is consistent with the natural frequency of the piezoelectric cantilever energy receiving-data sending end as an actuator.

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