A rotating wireless power supply communication sensor and communication method thereof

Abstract

The present invention discloses a rotating wireless power supply communication sensor and a communication method thereof. The wireless power supply communication sensor includes a rotating shaft, a static component sleeved on the rotating shaft, and a dynamic component. A first coil provided on the static component and a second coil provided on the rotating shaft are coaxially arranged. A first circuit board built into the static component is connected to the first coil, and a second circuit board built into the dynamic component is connected to the second coil. The first circuit board outputs an oscillating signal to drive the first coil and the second coil to couple. The AC voltage generated by the second coil is rectified and stabilized to supply power to the second circuit board. The second circuit board collects the signal when the dynamic component is subjected to force to perform pulse position modulation on the power supply circuit to control the current in the power supply circuit. The current is transmitted to the first circuit board through the coupling of the second coil and the first coil. The first circuit board detects the signal in the current, amplifies it, and decodes it to obtain the corresponding data. Transmitting data via current has stronger anti-interference capabilities.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and in particular to a rotating wireless power supply communication sensor and a communication method thereof. Background Art

[0002] With the development of modern industry, the demand for various types of sensors is increasing, and at the same time, higher requirements are placed on the reliability and service life of sensors. In some application scenarios, a sensor that can detect certain physical quantities of a rotating mechanism is often required, such as measuring the torque and bending degree of a transmission shaft. In these application scenarios, the detection part and the processing part (including power supply control and signal processing) of the sensor are respectively attached to rotatable and non-rotatable components, resulting in the inability to complete power supply and communication between the detection part and the processing part through wires. The existing solutions mainly include the following:

[0003] One method is to provide power and transmit data through contact methods such as slip rings or sliding vanes. However, this method is affected by factors such as vibration, dust and water resistance, and material wear resistance, and has a short service life and cannot meet the requirements of long life and high reliability.

[0004] The second method is to provide power and data communication through electromagnetic coupling resonance, microwave radio frequency signals or light wave signals, but the implementation cost of this method is relatively high.

[0005] The third method is wireless power supply through transformer coupling resonance, with reverse signal transmission performed via V (voltage)-F (frequency) and F-V conversion. This method converts the sampled signal into a frequency signal, transmits it via coil coupling, and the receiving end reconverts the frequency signal into a voltage signal. Although this method is low-cost and has a long service life, because analog signals are used throughout the transmission and conversion process, there are transmission errors, poor anti-interference capabilities, and the output drifts due to the influence of ambient temperature. At the same time, the conversion delay of analog quantities is high, which cannot meet the requirements of high precision and high response speed. Summary of the Invention

[0006] In response to the various shortcomings of the existing technology, the inventors have researched and designed a rotating wireless power supply communication sensor and its communication method through long-term practice. Wireless power supply is achieved through coil coupling resonance, and the pulse position of the power supply circuit is modulated by encoding to control the current in the power supply circuit to achieve reverse data transmission, with stronger anti-interference ability.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A rotating wireless power supply communication sensor includes a rotating shaft, a static component and a dynamic component sleeved on the rotating shaft; a first coil provided on the static component and a second coil provided on the rotating shaft are coaxially arranged; a first circuit board built into the static component is connected to the first coil, and a second circuit board built into the dynamic component is connected to the second coil;

[0009] The first circuit board outputs an oscillation signal to drive the first coil to couple with the second coil, and the AC voltage generated by the second coil is rectified and stabilized to supply power to the second circuit board;

[0010] The second circuit board collects signals when the dynamic component is subjected to force to perform pulse position modulation on the power supply circuit and control the current in the power supply circuit. The current is transmitted to the first circuit board through the coupling of the second coil and the first coil. The first circuit board detects the signal in the current, amplifies and decodes it, and obtains corresponding data.

[0011] Furthermore, in the rotating wireless power supply communication sensor, the static component includes a sleeve, a left support bearing and a right support bearing; the first coil is wound on the sleeve surface at the right end of the sleeve, the sleeve is sleeved on the shaft surface of the rotating shaft and makes the first coil coaxial with the second coil on the rotating shaft, the left support bearing is sleeved on the left end of the rotating shaft and abuts against the left end of the sleeve, the right support bearing is sleeved on the right end of the rotating shaft and abuts against the right end of the sleeve, the left and right support bearings are respectively installed at both ends of the five-way axle tube of the bicycle, and the sleeve and the rotating shaft are fixed in the five-way axle tube; the first circuit board is arranged inside the sleeve and electrically connected to the first coil.

[0012] Furthermore, in the rotating wireless power supply communication sensor, the dynamic component includes a torque detection disk and a fastener. The torque detection disk is sleeved on the right end of the rotating shaft and abuts against the right side of the right support bearing. The inner spline in the middle of the torque detection disk is spline-connected with the outer spline on the rotating shaft, and the fastener is spline-connected with the card slot on the edge of the torque detection disk through the 4-tooth spline on the inner side of the torque detection disk; a wire groove is provided on the rotating shaft, and a second circuit board is provided in the inner cavity of the torque detection disk. The second coil is electrically connected to the second coil through the wire groove, and a sensitive element is provided on the torque detection disk.

[0013] Furthermore, in the rotating wireless power supply communication sensor, the first circuit board is provided with a detection and amplification module, a drive module, a first control module, a digital-to-analog conversion module, and an output interface; the detection and amplification module is connected to the first control module and the first coil, the drive module is connected to the first control module and the first coil, the digital-to-analog conversion module is connected to the first control module and the output interface, the first control module is connected to the output interface, and the output interface is connected to an external control device;

[0014] The first control module outputs an oscillation signal to the driving module;

[0015] The driving module drives the first coil according to the oscillation signal, the first coil is coupled with the second coil, and an AC voltage is generated at both ends of the second coil to power the second circuit board;

[0016] The detection and amplification module detects and amplifies the current transmitted by the coupling of the second coil and the first coil, and then outputs a demodulated signal. The first control module decodes the demodulated signal and outputs a digital signal and outputs it through the output interface. It also outputs the bus signal to the digital-to-analog conversion module to convert it into a corresponding analog signal, and the analog signal is output through the output interface.

[0017] Furthermore, in the rotating wireless power supply communication sensor, the second circuit board is provided with an amplification conversion module, a second control module, a voltage stabilizing and rectifying module, and a variable load; the amplification conversion module is connected to the sensitive element and the second control module, the second control module is connected to the voltage stabilizing and rectifying module and the variable load, and the voltage stabilizing and rectifying module is connected to the variable load and the second coil;

[0018] The voltage stabilizing and rectifying module rectifies and stabilizes the AC voltage generated by the second coil and then outputs a third power supply voltage for power supply;

[0019] The amplification and conversion module amplifies the differential voltage signal output by the sensitive element according to the magnitude of the force;

[0020] The second control module samples the amplified differential voltage signal and generates a corresponding pulse position modulation signal;

[0021] The variable load controls the current in the power supply circuit according to the pulse position modulation signal, and the current is transmitted to the detection and amplification module through the coupling of the second coil and the first coil.

[0022] A communication method using the rotating wireless power supply communication sensor, comprising:

[0023] The first circuit board outputs an oscillation signal to drive the first coil to couple with the second coil, and the AC voltage generated by the second coil is rectified and stabilized to supply power to the second circuit board;

[0024] The second circuit board collects signals when the dynamic component is subjected to force to perform pulse position modulation on the power supply circuit, thereby controlling the magnitude of the current in the power supply circuit. The current is transmitted to the first circuit board through the coupling between the second coil and the first coil.

[0025] The first circuit board detects, amplifies and decodes the signal in the current to obtain corresponding data.

[0026] Furthermore, in the communication method, the step of the first circuit board outputting an oscillation signal to drive the first coil to couple with the second coil, and the AC voltage generated by the second coil being rectified and stabilized to supply power to the second circuit board specifically includes:

[0027] The first control module on the first circuit board outputs an oscillation signal to the driving module on the first circuit board;

[0028] The driving module drives the first coil according to the oscillation signal, the first coil is coupled with the second coil, and an AC voltage is generated at both ends of the second coil;

[0029] The voltage stabilizing and rectifying module on the second circuit board rectifies and stabilizes the AC voltage and then outputs a third power supply voltage to supply power to the second circuit board.

[0030] Furthermore, in the communication method, the second circuit board collects a signal when the dynamic component is subjected to force to perform pulse position modulation on the power supply circuit to control the current in the power supply circuit, and the step of transmitting the current to the first circuit board through the coupling of the second coil and the first coil specifically includes:

[0031] The sensitive elements in the dynamic component output differential voltage signals according to the magnitude of the force;

[0032] The amplification and conversion module on the second circuit board amplifies the differential voltage signal;

[0033] The second control module on the second circuit board samples the amplified differential voltage signal and generates a corresponding pulse position modulation signal;

[0034] The variable load on the second circuit board controls the current in the power supply circuit according to the pulse position modulation signal, and the current is transmitted to the detection and amplification module on the first circuit board through the coupling of the second coil and the first coil.

[0035] Furthermore, in the communication method, the step of the first circuit board detecting, amplifying, and decoding the signal in the current to obtain corresponding data specifically includes:

[0036] The detection and amplification module on the first circuit board detects and amplifies the current transmitted by the second coil coupled with the first coil and then outputs a demodulated signal;

[0037] The first control module decodes the demodulated signal and outputs a digital signal through the output interface. It also outputs the bus signal to the digital-to-analog conversion module to convert it into a corresponding analog signal, which is output through the output interface.

[0038] Furthermore, in the communication method, the second control module converts the amplified differential voltage signal into a pulse position modulation signal through binary coding or quaternary coding, and each pulse position modulation signal is a combination of a high level and a low level, and the duration of the low level is more than twice the duration of the high level.

[0039] Furthermore, in the communication method, the total load current in the high load state is 1.5 to 15 times the total load current in the low load state.

[0040] The beneficial effects of the present invention are:

[0041] Wireless power is achieved through the coupled resonance of two coils, while reverse data transmission is achieved by applying pulse position modulation (PPM) to the power supply circuit. The receiver only needs simple envelope detection and amplification to restore the signal, resulting in low cost and simple design. Furthermore, the use of current as the modulated signal carrier offers stronger interference resistance than voltage signals. Combined with the receiver's frequency-selective circuit design, this achieves excellent anti-interference performance. Its communication rate meets the requirements of most application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is an exploded view of a rotating wireless power communication sensor according to an embodiment of the present invention;

[0043] Figure 2 is a combined diagram of a rotating wireless power supply communication sensor according to an embodiment of the present invention;

[0044] Figure 3 is a cross-sectional view of a partial structure of a rotating wireless power supply communication sensor according to an embodiment of the present invention;

[0045] Figure 4 2 is a schematic structural diagram of a first circuit board and a second circuit board in an embodiment of the present invention;

[0046] Figure 5 This is a circuit diagram of the first coil, the detection and amplification module, and the driving module in the first embodiment of the present invention;

[0047] Figure 6 This is a circuit diagram of the first coil, the detection and amplification module, and the driving module in the second embodiment of the present invention;

[0048] Figure 7 is a circuit diagram of a first control module and a digital-to-analog conversion module in an embodiment of the present invention;

[0049] Figure 8 1 is a circuit diagram of a sensitive element, an amplifying and converting module, and a second control module in an embodiment of the present invention;

[0050] Figure 9 1 is a circuit diagram of a second coil, a voltage stabilizing rectifier module, and a variable load in an embodiment of the present invention;

[0051] Figure 10 is a flow chart of a communication method according to an embodiment of the present invention;

[0052] Figure 11 Schematic diagram of binary-coded code elements in an embodiment of the present invention;

[0053] Figure 12 Schematic diagram of quaternary coded symbols in an embodiment of the present invention;

[0054] Figure 13 Schematic diagram of binary-coded symbol data in an embodiment of the present invention;

[0055] Figure 14 2 is a waveform diagram of a frame of data in an embodiment of the present invention. DETAILED DESCRIPTION

[0056] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0057] It is easy to understand that, herein, relational terms such as first and second, etc. are only used to distinguish one entity, operation or direction from another entity, operation or direction, and do not require or imply any actual relationship or order between these entities, operations or directions. The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore change accordingly depending on their different positions and different usage states. Therefore, these or other directional terms should not be interpreted as restrictive terms. In the following description, various parameters and components are described for embodiments of different structures. These specific parameters and components are only used as examples and do not limit the embodiments of the present application.

[0058] Please also see Figures 1 to 3The rotating wireless power supply communication sensor provided in an embodiment of the present invention is typically mounted on the bottom bracket tube of a bicycle. The wireless power supply communication sensor includes a rotating shaft 1, a static component mounted on the rotating shaft 1, and a dynamic component mounted on one end of the rotating shaft. A first coil 2 provided on the static component is coaxially arranged with a second coil 3 provided on the rotating shaft 1. A first circuit board 4 built into the static component is connected to the first coil 2, and a second circuit board 5 built into the dynamic component is connected to the second coil 3. The first circuit board 4 outputs an oscillating signal to drive the first coil to couple with the second coil 3. The AC voltage generated by the second coil 3 is rectified and stabilized to power the second circuit board 5. The second circuit board 5 collects the signal generated by the dynamic component when it is subjected to force to perform pulse position modulation on the power supply circuit and control the current in the power supply circuit. The current is transmitted to the first circuit board 4 through the coupling between the second coil and the first coil. The first circuit board 4 detects the signal in the current, amplifies it, and decodes it to obtain the corresponding data, thereby realizing reverse data transmission. The first circuit board 4 is powered by an external power supply provided by the bicycle, such as the power supply end of a USB port, also called the first power supply end, which outputs a first power supply voltage of +5V.

[0059] In this embodiment, the force exerted on the dynamic component is the force exerted by the user on the pedal. The dynamic component can convert the magnitude of this force into a corresponding signal and load the data in the signal through the change of current, which is equivalent to using the current as the carrier of communication and converting the data into the corresponding current value. Since the pedal is constantly rotating, if the signal is output in a lead-wire manner, the wire will be entangled. Through the transformer-coupled resonance method of coupling the first coil and the second coil, it is possible to realize the power supply of the static component to the dynamic component, and to transmit the signal collected by the dynamic component to the static component by applying pulse position modulation to the power supply circuit to realize reverse data transmission. It has the characteristics of low cost, simple design, and strong anti-interference ability, and its communication rate can meet the requirements of most application scenarios.

[0060] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the static component includes a sleeve 6, a left support bearing 7, and a right support bearing 8; the first coil 2 is wound on the sleeve surface at the right end of the sleeve 6, and the sleeve 6 is sleeved on the shaft surface of the rotating shaft 1 so that the first coil 2 is coaxial with the second coil 3 on the rotating shaft 1. The left support bearing 7 is sleeved on the left end of the rotating shaft 1 and abuts the left end of the sleeve 6, and the right support bearing 8 is sleeved on the right end of the rotating shaft 1 and abuts the right end of the sleeve 6. The left and right support bearings are respectively installed at both ends of the bottom bracket axle of the bicycle, thereby fixing the sleeve 6 and the rotating shaft 1 in the bottom bracket axle; the first circuit board 4 is arranged inside the sleeve 6 and is electrically connected to the first coil 2. The retaining ring of the sleeve cover 16 is inserted into the mounting groove in the sleeve 6 to cover the first circuit board 4. In case of failure, the sleeve cover 16 can be removed to repair the first circuit board 4.

[0061] The dynamic component includes a torque detection disc 10 and a fastener 11. The torque detection disc 10 is sleeved on the right end of the rotating shaft 1 and abuts against the right side of the right support bearing 8. The internal spline in the middle of the torque detection disc 10 is spline-connected with the external spline 9 on the rotating shaft 1. The fastener 11 is spline-connected with the card slot 15 (correspondingly 4 are set) on the edge of the torque detection disc 10 through the 4-tooth spline 12 on the inner side of the torque detection disc 10; a wire groove 13 is provided on the rotating shaft 1, and a second circuit board 5 is provided in the inner cavity of the torque detection disc 10. The second coil 3 is electrically connected to the second coil 3 through the wire groove 13.

[0062] In this embodiment, the material of the rotating shaft 1 is preferably steel, so that the rotating shaft 1 can act as a magnetic conductive material to improve the coupling effect between the first coil 2 and the second coil 3. The torque detection disk 10 is provided with a sensitive element 14, which adopts a resistance strain gauge capable of detecting material deformation, such as Figure 8 As shown, the sensitive elements can be regarded as four resistors whose resistance varies with torque, forming a Wheatstone bridge and connected to the second circuit board 5 through leads.

[0063] After all components are assembled, the external splines 9 at each end of the rotating shaft 1 are used to connect to the crank. The four screw holes on the torque detection plate 10 are used to connect to the chainring. During use, the rider's pedaling force is transmitted through the crank to the rotating shaft 1, and then through the torque detection plate 10 to the chainring.

[0064] Please also refer to Figure 4In this embodiment, the first circuit board 4 is provided with a detection and amplification module 410, a drive module 420, a first control module 430, a digital-to-analog conversion module 440 and an output interface J1; the detection and amplification module 410 is connected to the first control module 430 and the first coil 2, the drive module 420 is connected to the first control module 430 and the first coil 2, the digital-to-analog conversion module 440 is connected to the first control module 430 and the output interface J1, the first control module 430 is connected to the output interface J1, and the output interface J1 is connected to an external control device, such as a power assist motor controller.

[0065] The first control module 430 outputs a high-frequency oscillation signal PA9 to the driver module 420 via its internal PWM output function. The driver module 420 drives the first coil 2 based on the oscillation signal PA9. The first coil 2 is coupled with the second coil 3, generating an AC voltage across the second coil 3 to power the second circuit board 5. The detection and amplification module 410 detects and amplifies the current transmitted by the second coil and the first coil, and then outputs a demodulated signal PA8. The first control module 430 decodes the demodulated signal PA8 and outputs a digital signal (i.e., data consisting of 0s and 1s) through the output interface. It also outputs a bus signal (e.g., an SPI signal or an I2C signal, the specific type of which is determined by the bus interface type of the output interface) to the digital-to-analog conversion module 440, which converts it into a corresponding analog signal. The analog signal is then output through the output interface.

[0066] Because the first coil 2 and the second coil 3 are coaxially arranged and contain magnetically conductive material in the center of the coils, transformer coupling is achieved. This coupling is not ideal transformer coupling, but rather the input-to-output voltage ratio is positively correlated with the turns ratio of the coils. Wireless power communication sensors require only a very low operating current, so even a relatively low coupling efficiency can meet power supply requirements.

[0067] The second circuit board 5 is provided with an amplifying and converting module 510, a second control module 520, a voltage stabilizing and rectifying module 530 and a variable load 540; the amplifying and converting module 510 is connected to the sensitive element 14 and the second control module 530, the second control module 530 is connected to the voltage stabilizing and rectifying module 540 and the variable load 550, and the voltage stabilizing and rectifying module 540 is connected to the variable load 550 and the second coil 3.

[0068] The voltage stabilizing and rectifying module 530 rectifies and stabilizes the AC voltage generated on the second coil 3 and outputs a third power supply voltage VCC_3V3 for power supply; the amplifying and converting module 510 amplifies the differential voltage signal output by the sensitive element 14 according to the force magnitude, the second control module 530 samples the amplified differential voltage signal and generates a corresponding pulse position modulation signal PPM, the variable load 540 controls the current in the power supply circuit according to the pulse position modulation signal PPM, and the current is transmitted to the detection and amplification module 410 through the coupling of the second coil and the first coil.

[0069] Please also refer to Figure 5 The detection and amplification module 410 includes a first switch tube Q1, a first diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4; the positive electrode of the first diode D1 is connected to one end of the fourth capacitor C4 and one end of the first coil 2; the negative electrode of the first diode D1 is connected to one end of the first capacitor C1, one end of the first resistor R1 and one end of the second capacitor C2; the other end of the second capacitor C2 is connected to one end of the third capacitor C3, One end of the second resistor R2 and one end of the sixth resistor R6; the other end of the sixth resistor R6 is connected to the base of the first switch tube Q1 and one end of the third resistor R3; the other end of the first capacitor C1, the other end of the fourth capacitor C4, the other end of the first resistor R1 and the other end of the second resistor R2 are all grounded; the other end of the third resistor R3 is connected to one end of the fourth resistor R4 and the first power supply end (providing a first power supply voltage of +5V), the collector of the first switch tube Q1 is connected to the other end of the fourth resistor R4 and the first control module 430, and the emitter of the first switch tube Q1 is grounded through the fifth resistor R5.

[0070] The first switching transistor Q1 is an NPN transistor. A detection circuit consisting of a first diode D1, a first resistor R1, and a first capacitor C1 performs envelope detection on the current in the first coil 2 (the signal passing through the frequency selection circuit) and detects a corresponding signal. The detected signal is amplified by controlling the on / off switching of the first switching transistor Q1 (when the detected signal is high, Q1 is turned on and its collector output is low; when the detected signal is low, Q1 is turned off and the output signal on its collector is pulled up to a high level of +5V by the fourth resistor R4). This generates a restored pulse signal PA8. Due to the inverting effect of Q1, the pulse signal at this time is inverted with respect to the original pulse position modulation signal.

[0071] Since the power consumption of the wireless power supply communication sensor is relatively low, in order to further improve the anti-interference capability, a frequency selection circuit is provided at the input end of the detection and amplification module 410, which has a frequency selection characteristic and filters the current signal input by the first coil 2. If the power consumption of the dynamic component of the sensor is relatively low (less than 50mA), a series frequency selection circuit can be used, that is, the first coil 2 is connected in series with the fourth capacitor C4 to form a series resonant circuit, such as Figure 5 As shown in Figure 2, if the power consumption of the dynamic components of the sensor is high (above 50mA), a parallel frequency selection circuit can be used, such as Figure 6 As shown, the center tap of the first coil 2 is used to divide the first coil 2 into two parts, and the lower part is connected in parallel with the fourth capacitor C4 to form a parallel resonant circuit. In the two frequency selection circuits, the number of turns of the first coil 2 is the same. The corresponding frequency selection circuit can be selected according to the power consumption of the dynamic component. It should be understood that Figure 5 and Figure 6 These are two embodiments of the frequency selection circuit. Except for the different connection methods of the first coil and the fourth capacitor C4, the connection relationship of other components in the two embodiments remains unchanged. Therefore, the names of the components in the two embodiments remain unchanged.

[0072] The driving module 420 includes a driving chip U1, a fifth capacitor C5, a sixth capacitor C6 and a seventh capacitor C7; the 1A pin of the driving chip U1 is connected to the 2A pin of the driving chip U1 and the first control module 430, and the GND pin of the driving chip U1 is grounded; the 1Y pin of the driving chip U1 is connected to the 2Y pin of the driving chip U1, one end of the sixth capacitor C6 and one end of the seventh capacitor C7; the other end of the sixth capacitor C6, the other end of the seventh capacitor C7 and the VCC pin of the driving chip U1 are all connected to the first power supply end; the VCC pin of the driving chip U1 is also grounded through the fifth capacitor C5.

[0073] The driver chip U1 is preferably of the U74LVC2G17 type, which amplifies the oscillation signal PA9 and outputs it to the first coil 2. The first coil 2 is coupled to the second coil 3. The second coil 3 is affected by the coupled alternating magnetic field, generating an AC voltage at both ends of the second coil 3, thereby powering the second circuit board. In specific implementations, the driver chip may also be of other types (such as SN74AHC14, SN74AHC04, SN74LVC2G17, or SN74LVC2G04) and their corresponding peripheral circuits, as long as they can achieve the signal drive enhancement function. This is not limited here.

[0074] Please also refer to Figure 7The first control module 430 includes a controller U2, a seventh resistor R7, an eighth resistor R8, an eighth capacitor C8 and a ninth capacitor C9; the PA12 pin of the controller U2 is connected to the 2nd pin of the output interface J1 through the seventh resistor R7, the PA3 pin of the controller U2 is connected to the 1st pin of the output interface J1 through the eighth resistor R8, and the VSS pin of the controller U2 is grounded; the VDD pin of the controller U2 is connected to the first power supply end, one end of the eighth capacitor C8 and one end of the ninth capacitor C9, and the other end of the eighth capacitor C8 is connected to the other end of the ninth capacitor C9 and ground; the PA0 / WKUP pin, PA5 pin and PA6 pin of the controller U2 are all connected to the digital-to-analog conversion module 440; the PA2 pin of the controller U2 is connected to the 3rd pin of the output interface J1, the PA9 pin of the controller U2 is connected to the 2A pin of the driver chip U1, the PA8 pin of the controller U2 is connected to the collector of the first switch tube Q1, the 4th pin of the output interface J1 is connected to the digital-to-analog conversion module 440, the 5th pin of the output interface J1 is grounded, and the 6th pin of the output interface J1 is connected to the first power supply end.

[0075] The controller U2 is preferably MM32F0010, and the output interface J1 is a wire-to-board or wire-to-wire connector such as a waterproof plug or aviation plug. The internal program of the controller U2 is configured with a PWM output function, which automatically outputs a high-frequency oscillation signal PA9 to the driver chip U1 after power-on. It also decodes the demodulated signal PA8 fed back by the detection and amplification module, outputs digital signals (UART1_TX, UART1_RX), and outputs them through the output interface J1. The controller U2 outputs the SPI bus signal (SS signal, Slave Select), CLK signal (clock signal), and MOSI signal (Master output slave input) to the digital-to-analog conversion module 440.

[0076] The digital-to-analog conversion module 440 includes a digital-to-analog conversion chip U3, an inductor L1, a ninth resistor R9, a tenth capacitor C10, an eleventh capacitor C11, and a twelfth capacitor C12; the PD pin of the digital-to-analog conversion chip U3 is connected to the DVDD pin of the digital-to-analog conversion chip U3, one end of the inductor L1, one end of the tenth capacitor C10, and a second power supply end (providing a second power supply voltage VCC_4V2); the LDAC pin, CS pin, AGND pin, DGND pin, and EPAD pin of the digital-to-analog conversion chip U3 are all grounded; the DIN pin, SCLK pin, and FS pin of the digital-to-analog conversion chip U3 are connected to the The PA6 pin, PA5 pin, and PA0 / WKUP pin are connected one-to-one; the AVDD pin of the digital-to-analog conversion chip U3 is connected to the other end of the inductor L1 and one end of the eleventh capacitor C11, the REF pin of the digital-to-analog conversion chip U3 is connected to the fifth power supply end (providing the fifth power supply voltage VREF, which is half of the second power supply voltage VCC_4V2), and the OUT pin of the digital-to-analog conversion chip U3 is connected to one end of the twelfth capacitor C12 and the fourth pin of the output interface J1 through the ninth resistor R9; the other end of the tenth capacitor C10, the other end of the eleventh capacitor C11, and the other end of the twelfth capacitor C12 are all grounded.

[0077] The D / A converter chip U3 is preferably an MS5611D chip. It communicates with the controller U2 via the SPI bus via the SS, CLK, and MOSI signals to transmit corresponding data. The analog signal (consisting of high and low levels) output from the OUT pin of the D / A converter chip U3 is filtered by the filter circuit composed of R9 and C12 before being output through the output interface J1.

[0078] Please also refer to Figure 8 The amplification and conversion module 510 includes an operational amplifier U4, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13 and a thirteenth capacitor C13; the IN+ pin of the operational amplifier U4 is connected to one end of the tenth resistor R10 and one end of the eleventh resistor R11, the V- pin of the operational amplifier U4 and the other end of the tenth resistor R10 are both grounded, the IN- pin of the operational amplifier U4 is connected to one end of the twelfth resistor R12 and one end of the thirteenth resistor R13, the other end of the eleventh resistor R11 is connected to one end of the sensitive element 14, the other end of the twelfth resistor R12 is connected to the other end of the sensitive element 14, the V+ pin of the operational amplifier U4 is connected to the third power supply end and one end of the thirteenth capacitor C13, the other end of the thirteenth capacitor C13 is grounded, and the OUPUT pin of the operational amplifier U4 is connected to the other end of the thirteenth resistor R13 and the second control module 520.

[0079] The sensor 14 serves as the input of an operational amplifier U4, whose output is connected to the analog-to-digital converter (ADC) pin of the MCU within the second control module 520. During operation, torque causes the resistance of the strain gauge to change. This voltage is converted by a Wheatstone bridge (i.e., the sensor 14 comprises four resistors whose resistance varies with torque), generating a differential voltage signal across the bridge. This signal is amplified by the operational amplifier U4 and output as an acquisition signal VADC to the second control module 520.

[0080] Preferably, the amplification and conversion module 510 also includes a fourteenth resistor R14, a fifteenth resistor R15, a fourteenth capacitor C14, a fifteenth capacitor C15 and a sixteenth capacitor C16; one end of the fourteenth resistor R14 is connected to one end of the fourteenth capacitor C14 and one end of the fifteenth capacitor C15, and the other end of the fourteenth resistor R14 is connected to one end of the sensitive element 14; one end of the fifteenth resistor R15 is connected to the other end of the fifteenth capacitor C15, one end of the sixteenth capacitor C16 and the other end of the twelfth resistor R12, the other end of the fifteenth resistor R15 is connected to the other end of the sensitive element 14, and the other end of the fourteenth capacitor C14 and the other end of the sixteenth capacitor C16 are both grounded.

[0081] The fifteenth capacitor C15 is used to filter differential-mode interference; the fourteenth and sixteenth capacitors C14 and C16 are used to filter common-mode interference. The fourteenth and fifteenth resistors R14 and R15 are reserved zero-ohm resistors. The thirteenth resistor R13 is a feedback resistor, used in conjunction with the twelfth resistor R12 to determine the gain. The tenth and eleventh resistors R10 and R11 are reserved bias resistors. In actual use, R11 is set to zero ohm, and R10 is not installed. The thirteenth capacitor C13 is used for op amp power supply filtering.

[0082] The second control module 520 includes an MCU U5, a seventeenth capacitor C17 and an eighteenth capacitor C18; the PC0 pin of the MCU U5 is connected to the variable load 540; the VDD pin of the MCU U5 is connected to the third power supply end, one end of the seventeenth capacitor C17 and one end of the eighteenth capacitor C18, the other end of the seventeenth capacitor C17 and the other end of the eighteenth capacitor C18 are both grounded, and the PA4 pin of the MCU U5 is connected to the OUPUT pin of the operational amplifier U4.

[0083] The MCU U5 collects the acquisition signal VADC through its internal ADC pin to generate a pulse position modulation signal PPM. The specific generation method is detailed in the following communication method.

[0084] Please also refer to Figure 9The voltage stabilizing rectifier module 530 includes a voltage stabilizing chip U6, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, a twenty-second capacitor C22, a twenty-third capacitor C23, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6; the VCC pin of the voltage stabilizing chip U6 is connected to the EN pin of the voltage stabilizing chip U6, one end of the twentieth capacitor C20, the fourth power supply end (providing the fourth power supply voltage VCC_5V) and the negative electrode of the second diode D2; the other end of the twentieth capacitor C20 and the GND pin of the voltage stabilizing chip U6 are both grounded, and the twenty-first capacitor C21 is connected to the second The tenth capacitor C20 is connected in parallel, and the twenty-second capacitor C22 is connected in parallel with the twentieth capacitor C20; the VOUT pin of the voltage regulator chip U6 is the third power supply terminal and is grounded through the nineteenth capacitor C19; the anode of the second diode D2 is connected to the cathode of the third diode D3, the cathode of the fourth diode D4, one end of the twenty-third capacitor C23 and the variable load 540; the other end of the twenty-third capacitor C23 is connected to the anode of the fifth diode D5, the anode of the sixth diode D6 and ground; the anode of the third diode D3 is connected to the cathode of the fifth diode D5 and one end of the second coil 3, and the anode of the fourth diode D4 is connected to the cathode of the sixth diode D6 and the other end of the second coil 3.

[0085] The variable load 540 includes a second switch tube Q2, a sixteenth resistor R16, a seventeenth resistor R17, and an eighteenth resistor R18; the base of the second switch tube Q2 is connected to one end of the sixteenth resistor R16 and one end of the seventeenth resistor R17, the other end of the sixteenth resistor R16 is connected to the PC0 pin of the MCU U5, the emitter of the second switch tube Q2 is connected to the other end of the seventeenth resistor R17 and ground, and the collector of the second switch tube Q2 is connected to the anode of the second diode D2 through the eighteenth resistor R18.

[0086] The second switching transistor Q2 is an NPN transistor, and the voltage regulator chip U6 is preferably ME6119. The MCU U5 outputs a PPM signal to control the on / off state of Q2, thereby switching the operating state of the variable load and controlling the load current. The load current is rectified by the rectifier bridge formed by D3-D6 and output to the second coil 3. The data is then transmitted to the first circuit board 4 via the second coil 3. The signal is detected by the detection and amplification module on the first circuit board 4, and then amplified to obtain a demodulated signal. The signal is then decoded by the controller U2 to obtain the original data.

[0087] Based on the above-mentioned rotating wireless power supply communication sensor, this embodiment also provides a communication method for a rotating wireless power supply communication sensor. Please refer to Figure 10 , the communication method comprises the steps of:

[0088] S100: The first circuit board outputs an oscillation signal to drive the first coil to couple with the second coil. The AC voltage generated by the second coil is rectified and stabilized to supply power to the second circuit board.

[0089] S200: The second circuit board collects a signal when the dynamic component is subjected to force to perform pulse position modulation on the power supply circuit to control the current in the power supply circuit. The current is transmitted to the first circuit board through the coupling between the second coil and the first coil.

[0090] S300: The first circuit board detects, amplifies, and decodes the signal in the current to obtain corresponding data.

[0091] In this embodiment, step S100 primarily implements wireless power supply from a static component to a dynamic component. The first control module on the first circuit board outputs a high-frequency oscillation signal to the driver module via its internal PWM output function. The driver module drives the first coil 2 based on the oscillation signal PA9. The first coil 2 couples with the second coil 3, generating an AC voltage across the ends of the second coil 3. This voltage is rectified and stabilized by the voltage stabilizing and rectifying module, and then output as a third supply voltage to power the second circuit board 5.

[0092] Steps 200 and 300 are used to implement wireless data transmission from a dynamic component to a static component, i.e., reverse communication. In step S200, the amplification and conversion module 510 amplifies the differential voltage signal output by the sensitive element 14 based on the force applied. The second control module 530 samples the amplified differential voltage signal and generates a corresponding pulse position modulation signal (PPM). The variable load 540 controls the current in the power supply circuit based on the pulse position modulation signal (PPM). The current is then transmitted to the detection and amplification module 410 via the coupling between the second coil and the first coil.

[0093] In step S300, the detection and amplification module 410 detects and amplifies the current transmitted by the coupling between the second coil and the first coil, and then outputs a demodulated signal PA8. The first control module 430 decodes the demodulated signal PA8 and outputs a digital signal (i.e., data consisting of 0s and 1s) through the output interface. It also outputs the bus signal to the digital-to-analog conversion module 440, which converts it into a corresponding analog signal, and the analog signal is output through the output interface.

[0094] In this embodiment, the oscillation signal PA9 of the power supply circuit is used as the carrier for communication. The power supply current and the current used to represent data are both transmitted between the two circuit boards through the coupling of the first coil and the second coil. The power supply is generated by the oscillation signal PA9, and the power supply frequency of the oscillation signal PA9 is the carrier frequency.

[0095] Therefore, the following factors need to be considered when selecting the carrier frequency:

[0096] First, the hysteresis of the magnetic circuit (the path connecting the two coils) is a factor. Due to the hysteresis effect, an excessively high oscillation frequency increases losses and reduces transmission efficiency. Therefore, the oscillation frequency is generally between 10 kHz and 1 MHz. Second, the transmission rate. Higher communication rates require a higher carrier frequency. To simplify the detection and amplification modules, the pulse position modulation (PPM) signal, when encoded in binary or quaternary format, must have a high and low level interval of more than 20 carrier cycles.

[0097] To improve anti-interference capabilities, this embodiment uses current modulation (i.e., the on / off control of the second switch Q2 is based on the pulse position modulation signal PPM, thereby changing the current). Since modulation can significantly change the current of the variable load, in order to control power consumption and ensure power supply stability, this embodiment does not use the existing encoding method of high and low levels to represent 0 or 1. Instead, it adopts a modulation method that encodes by controlling the pulse position. That is, the MCU U5 generates the pulse position modulation signal PPM through binary or quaternary encoding. Each pulse position modulation signal PPM is a combination of a high level and a low level. At the same time, the low level duration is limited to 2-10 times that of the high level. Therefore, the duration of each data bit is 60-220 carrier cycles, so the carrier frequency can be roughly determined by the bit rate.

[0098] For example, if each frame has 32 bits of data and 100 frames per second, taking into account the start bit, stop bit, and interframe interval, the bit rate is greater than 3400, and the carrier frequency is greater than 204 kHz. Bit rate = total number of bits / time. If each frame has 32 bits of data and 100 frames per second, the total number of bits per second is 3200 bits. Considering that each frame contains one start bit and one stop bit, the total number of bits per second is 3400 bits. Considering that there is an interval between frames, meaning that transmission is not continuous, and after excluding idle time, the time required to transmit 3400 bits is less than one second, the bit rate is greater than 3400 bits. As mentioned earlier, each data bit occupies at least 60 carrier cycles, so 3400 * 60 = 204 kHz.

[0099] In order to further improve the anti-interference ability, it can also be limited as follows:

[0100] 1. To ensure sufficient modulation depth, the load current corresponding to the high and low levels must differ by at least 1.5 times, but should be less than 15 times to prevent excessive voltage fluctuations in the detection circuit. That is, the loop current in the high-load state (Q2 on) should be 1.5 to 15 times that in the low-load state (Q2 off). This embodiment achieves current modulation by changing the operating state of the variable load. The modulation depth is controlled by setting the magnitude of the current flowing through the variable load in different states. The magnitude of the current can be set by the resistance of resistor R18 or the duty cycle of the pulse position modulation signal PPM. For example, when Q2 is off and the total current in the low-load state is 10mA (the sum of the currents flowing through the second coil and D3-D6), the total current in the high-load state (Q2 on) (the sum of the currents flowing through the second coil, D3-D6, and R18) should be between 15mA and 150mA. In other words, the current flowing through the variable load in the high-load state is 5mA to 145mA greater than that in the low-load state.

[0101] 2. The operating current of the MCU and its peripheral circuits must be stable, with current fluctuations within 20%. The circuit's operating state should also remain relatively stable to avoid interference with the modulation signal due to changes in the circuit's operating state. This can be achieved by adjusting the capacitance of the energy storage capacitor in the input stage of the regulated current (i.e., capacitor C22) and the energy storage capacitor in the output stage (i.e., capacitor C19). A series inductor can be added to the output stage if necessary.

[0102] The capacity of the energy storage capacitor of the input stage is calculated according to the following formula:

[0103]

[0104] Wherein, C represents the capacitance of the 22nd capacitor C22, U in Represents the output voltage of the rectifier bridge (i.e. the voltage at the anode of the second diode D2), U out Indicates the output voltage of the regulated current (ie, the fourth power supply voltage VCC_5V), U drop It represents the minimum voltage difference of the voltage stabilizing chip U6, I represents the output current of the voltage stabilizing chip U6, and T represents the duration of a frame of data waveform.

[0105] If the rectified output voltage is 5V, the output voltage of the voltage regulator chip U6 is 3.3V, the output current is 5mA, the minimum voltage difference of the voltage regulator chip U6 is 100mV, and the duration of one frame waveform is 7ms, then the capacitance of the twenty-second capacitor C22 is at least 8.59uF.

[0106] 3. There needs to be sufficient code element differentiation, and the duration of each code element should differ by more than 1 times. The encoding method proposed in this embodiment includes 3 types of code elements, such as Figure 11As shown, they are the start bit, sign bit, and stop bit. The sign bit is usually encoded in binary, which contains two code elements, logic 0 and logic 1. Each code element consists of a high-level pulse and a low-level pulse, the difference being only in the duration of the high and low levels. The sign bit can also be formed into other bases by combining more high and low levels. For example, the quaternary system should contain four code elements, logic 0 to logic 3, and use quaternary encoding, such as Figure 12 As shown in the figure, high base can bring lower power consumption and higher transmission rate, but the anti-interference ability will be slightly reduced.

[0107] The high and low levels of the encoded pulse position modulation signal PPM control the state of the variable load, that is, the high level controls Q2 to be turned on, which corresponds to a high load state, and the low level controls Q2 to be turned off, which corresponds to a low load state. The modulation result causes a specific change in the load current. In order to ensure that there is no voltage drop or excessive power consumption due to excessive load current, the duty cycle of each code element should not be greater than 1 / 3, that is, TxH<2*TxL, x can be a number 0~3, S (indicates start) and E (indicates end), TxH represents the high level time of code element x, and TxL represents the low level time of code element x.

[0108] In order to ensure that the decoded code elements have sufficient discrimination and improve the anti-interference performance, taking binary as an example, it is stipulated that the period of logic 0 is 1 / 2 or 2 times that of logic 1, and the period of the start bit and stop bit is much longer than the sign bit. In order for the detection and amplification module to accurately restore the signal waveform, the high and low level time of each code element cannot be less than 20 carrier cycles. The demodulated signal PA8 is transmitted to the PA8 pin of the controller U2. The pulse period and duty cycle of each cycle of the pulse position modulation signal PPM are captured through the PWM input function inside the controller U2 to complete the decoding and obtain the data. A certain fault tolerance rate needs to be set during decoding to reduce bit errors. Since the code elements in this embodiment have sufficient discrimination, the fault tolerance rate can be set at 20% to 30%.

[0109] In this embodiment, the frequency of the oscillation signal PA9 is preferably set to 888kHz (other values ​​are also acceptable, as long as it meets the requirement of being greater than 60 times the baud rate and the transmission efficiency can meet the power consumption requirements of the dynamic part). The current in the high-load state is set to about twice that in the low-load state. The load current of the pulse position modulation signal PPM is about 10mA when it is at a high level and about 5mA when it is at a low level. The load current in the high level can be determined by setting the resistance value of resistor R18. According to the above-mentioned high-level duty cycle of the code element is not greater than 1 / 3, and the duration of the high and low levels is not less than 20 carrier cycles, the code element data under binary encoding is set as follows: Figure 13 Each frame has 4 bytes of data, 1 byte of status word, 2 bytes of data word, and 1 byte of check word. The 2 bytes of data word are bitwise XORed as the check word. The complete waveform of one frame is as shown below. Figure 14According to this design, the transmission time of each frame of data does not exceed 7752us, and the transmission rate exceeds 100 frames per second.

[0110] In summary, the present invention provides a rotating wireless power supply communication sensor and a communication method thereof, wherein the static component is used to power the dynamic component, the dynamic component is used to measure and detect the pedaling signal, the signal is encoded to generate a corresponding pulse position modulation signal, the pulse position modulation signal is used to control the current size of the variable load, the current modulation is achieved by encoding, the signal data is loaded by the current size and sent to the static component through the coupling of two coils, the static component detects and amplifies the current to obtain a demodulated signal, the PWM input function is used to capture the pulse period and width of the pulse demodulation signal, thereby obtaining decoded data, converting the data into digital signals and analog signals and outputting them through the output interface, and realizing the calibration function of the sensor. Transmitting data through current has lower costs and stronger anti-interference capabilities than existing analog signals, and improves the transmission accuracy and response speed. The communication rate can meet the needs of different application scenarios.

[0111] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A rotating wireless power supply communication sensor, characterized in that: The invention comprises a rotating shaft, a static component and a dynamic component sleeved on the rotating shaft; a first coil provided on the static component and a second coil provided on the rotating shaft are placed coaxially, a first circuit board built into the static component is connected to the first coil, and a second circuit board built into the dynamic component is connected to the second coil; The first circuit board outputs an oscillation signal to drive the first coil to couple with the second coil, and the AC voltage generated by the second coil is rectified and stabilized to supply power to the second circuit board; The second circuit board collects signals when the dynamic component is subjected to force to perform pulse position modulation on the power supply circuit to control the current in the power supply circuit. The current is transmitted to the first circuit board through the coupling of the second coil and the first coil. The first circuit board detects the signal in the current, amplifies it, and decodes it to obtain corresponding data. The rotating shaft includes a rotating shaft spline, and the dynamic component includes a torque detection disk connected to the rotating shaft spline, and the torque detection disk is provided with a Wheatstone bridge composed of sensitive elements; The second circuit board includes a variable load module, which is composed of a switch tube and a resistor network. The variable load module controls the power supply circuit current to switch between high and low load states through a pulse position modulation signal, and the high load current is 1.5-15 times the low load current; The first circuit board is provided with a frequency selection circuit, which includes a series frequency selection circuit or a parallel frequency selection circuit. If the power consumption of the dynamic component is less than the threshold, the series frequency selection circuit is used; if the power consumption of the dynamic component of the sensor is higher than the threshold, the parallel frequency selection circuit is used.

2. The rotating wireless power supply communication sensor according to claim 1, characterized in that: The static component includes a sleeve, a left support bearing and a right support bearing; the first coil is wound on the sleeve surface at the right end of the sleeve, the sleeve is sleeved on the shaft surface of the rotating shaft and makes the first coil coaxial with the second coil on the rotating shaft, the left support bearing is sleeved on the left end of the rotating shaft and abuts against the left end of the sleeve, the right support bearing is sleeved on the right end of the rotating shaft and abuts against the right end of the sleeve, the left and right support bearings are respectively installed at both ends of the five-way axle tube of the bicycle, and the sleeve and the rotating shaft are fixed in the five-way axle tube; the first circuit board is arranged inside the sleeve and electrically connected to the first coil.

3. The rotating wireless power supply communication sensor according to claim 2, characterized in that: The dynamic component includes a torque detection disc and a fastener. The torque detection disc is sleeved on the right end of the rotating shaft and abuts against the right side of the right support bearing. The internal spline in the middle of the torque detection disc is spline-connected with the external spline on the rotating shaft. The fastener is spline-connected with the card slot on the edge of the torque detection disc through the 4-tooth spline on the inner side of the torque detection disc; a wire groove is provided on the rotating shaft, and a second circuit board is provided in the inner cavity of the torque detection disc. The second coil is electrically connected to the second coil through the wire groove, and a sensitive element is provided on the torque detection disc.

4. The rotating wireless power supply communication sensor according to claim 3, characterized in that: The first circuit board is provided with a detection and amplification module, a driving module, a first control module, a digital-to-analog conversion module and an output interface; the detection and amplification module is connected to the first control module and the first coil, the driving module is connected to the first control module and the first coil, the digital-to-analog conversion module is connected to the first control module and the output interface, the first control module is connected to the output interface, and the output interface is connected to an external control device; The first control module outputs an oscillation signal to the driving module; The driving module drives the first coil according to the oscillation signal, the first coil is coupled with the second coil, and an AC voltage is generated at both ends of the second coil to power the second circuit board; The detection and amplification module detects and amplifies the current transmitted by the coupling of the second coil and the first coil, and then outputs a demodulated signal. The first control module decodes the demodulated signal and outputs a digital signal and outputs it through the output interface. It also outputs the bus signal to the digital-to-analog conversion module to convert it into a corresponding analog signal, and the analog signal is output through the output interface.

5. The rotating wireless power supply communication sensor according to claim 4, characterized in that: The second circuit board is provided with an amplifying and converting module, a second control module, a voltage stabilizing and rectifying module and a variable load; the amplifying and converting module is connected to the sensitive element and the second control module, the second control module is connected to the voltage stabilizing and rectifying module and the variable load, and the voltage stabilizing and rectifying module is connected to the variable load and the second coil; The voltage stabilizing and rectifying module rectifies and stabilizes the AC voltage generated by the second coil and then outputs a third power supply voltage for power supply; The amplification and conversion module amplifies the differential voltage signal output by the sensitive element according to the magnitude of the force; The second control module samples the amplified differential voltage signal and generates a corresponding pulse position modulation signal; The variable load controls the current in the power supply circuit according to the pulse position modulation signal, and the current is transmitted to the detection and amplification module through the coupling of the second coil and the first coil.

6. A communication method using the rotating wireless power supply communication sensor according to claim 1, characterized in that: include: The first circuit board outputs an oscillation signal to drive the first coil to couple with the second coil, and the AC voltage generated by the second coil is rectified and stabilized to supply power to the second circuit board; The second circuit board collects signals when the dynamic component is subjected to force to perform pulse position modulation on the power supply circuit, thereby controlling the magnitude of the current in the power supply circuit. The current is transmitted to the first circuit board through the coupling between the second coil and the first coil. The first circuit board detects, amplifies and decodes the signal in the current to obtain corresponding data.

7. The communication method according to claim 6, wherein: The first circuit board outputs an oscillation signal to drive the first coil to couple with the second coil, and the AC voltage generated by the second coil is rectified and stabilized to supply power to the second circuit board. The steps specifically include: The first control module on the first circuit board outputs an oscillation signal to the driving module on the first circuit board; The driving module drives the first coil according to the oscillation signal, the first coil is coupled with the second coil, and an AC voltage is generated at both ends of the second coil; The voltage stabilizing and rectifying module on the second circuit board rectifies and stabilizes the AC voltage and then outputs a third power supply voltage to supply power to the second circuit board.

8. The communication method according to claim 7, wherein: The second circuit board collects a signal when the dynamic component is subjected to force to perform pulse position modulation on the power supply circuit to control the current in the power supply circuit, and the step of transmitting the current to the first circuit board through the coupling of the second coil and the first coil specifically includes: The sensitive elements in the dynamic component output differential voltage signals according to the magnitude of the force; The amplification and conversion module on the second circuit board amplifies the differential voltage signal; The second control module on the second circuit board samples the amplified differential voltage signal and generates a corresponding pulse position modulation signal; The variable load on the second circuit board controls the current in the power supply circuit according to the pulse position modulation signal, and the current is transmitted to the detection and amplification module on the first circuit board through the coupling of the second coil and the first coil.

9. The communication method according to claim 8, wherein: The steps of the first circuit board detecting, amplifying, and decoding the signal in the current to obtain corresponding data specifically include: The detection and amplification module on the first circuit board detects and amplifies the current transmitted by the second coil coupled with the first coil and then outputs a demodulated signal; The first control module decodes the demodulated signal and outputs a digital signal through the output interface. It also outputs the bus signal to the digital-to-analog conversion module to convert it into a corresponding analog signal, which is output through the output interface.

10. The communication method according to claim 8, wherein: The second control module converts the amplified differential voltage signal into a pulse position modulation signal through binary coding or quaternary coding. Each pulse position modulation signal is a combination of a high level and a low level, and the duration of the low level is more than twice the duration of the high level.

11. The communication method according to claim 8, wherein: The total load ground current under high load conditions is 1.5 to 15 times greater than the total load ground current under low load conditions.

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