A torque measuring device

Abstract

The embodiment of the present invention discloses a torque measuring device. The device includes: a wireless power supply device, a voltage conversion device, an analog-to-digital conversion device, a single-chip microcomputer, and a wireless data transmission device; the wireless power supply device is connected to the voltage conversion device; the voltage conversion device includes: a first voltage conversion module, a second voltage conversion module, and a third voltage conversion module; the analog-to-digital conversion device includes: an analog-to-digital converter AD7190 connected to the second voltage output end of the second voltage conversion module and a strain sensor interface; the serial data output / data ready output pin of the analog-to-digital converter is connected to the single-chip microcomputer, which is used to send the processed data to the single-chip microcomputer; the strain sensor interface is connected to send the voltage difference generated by the strain gauge to the analog-to-digital converter; the single-chip microcomputer is used to send the data to the wireless data transmission device. The solution provided by the embodiment of the present invention can improve the accuracy of the torque measurement result.

Description

Technical Field

[0001] The present invention relates to the technical field of torque measurement, and in particular to a torque measurement device. Background Art

[0002] With the development of the domestic automobile industry, new models emerge in an endless stream, and automobile bench and road testing are becoming more and more important. Modern engines need to increase the speed to improve mechanical performance and efficiency, and torque is an important indicator of motor and engine performance, so high-precision and high-reliability torque measurement is required.

[0003] The existing torque measurement methods mainly include the resistance strain gauge transmission measurement method. Torque will cause a certain strain in the product to be tested, and this strain is proportional to the magnitude of the torque. Therefore, the magnitude of the corresponding torque can be detected by the resistance strain gauge that will undergo torsional deformation. When the product to be tested is subjected to torque, the maximum strain is generated in the direction at an angle of 45° to the axis. Therefore, sticking the resistance strain gauge in this direction can detect the magnitude of the torque on the transmission shaft.

[0004] In the known method, the output voltage signal of the measuring bridge is mainly led out through slip rings and brushes. Slip rings are generally made of copper, and brushes are divided into carbon brushes and metal brushes. Since the voltage signal output by the measuring bridge is very weak, in order to ensure the accuracy of the output signal, the contact resistance between the slip ring and the brush is required to be very stable. In practical applications, the contact resistance between the slip ring and the brush is unreliable, which will cause signal fluctuations, resulting in inaccurate torque measurement results. Summary of the invention

[0005] The present invention provides a torque measurement device to improve the accuracy of torque measurement results. The specific technical solution is as follows.

[0006] A torque measuring device, comprising: a wireless power supply device, a voltage conversion device, an analog-to-digital conversion device, a single-chip microcomputer, and a wireless data transmission device;

[0007] The wireless power supply device includes: a power transmission transmission module, which is used to generate a first AC voltage; a transmitting coil, which is connected to the power transmission transmission module and is used to receive the first AC voltage; a receiving coil arranged in parallel with the transmitting coil, which is used to generate a second AC voltage; an input interface connected to the receiving coil, which is connected to the first pin of the rectifier bridge through a first voltage input pin, and is connected to the second pin of the rectifier bridge through a second voltage input pin; and is used to send the second AC voltage to the rectifier bridge; the third pin of the rectifier bridge is connected to the positive electrode of the first diode; the fourth pin of the rectifier bridge is connected to the negative electrode of the first diode; the negative electrode of the first diode is also connected to one end of the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, and the eighth capacitor; the positive electrode of the first diode is grounded, and is connected to the other ends of the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, and the eighth capacitor;

[0008] The voltage conversion device comprises: a first voltage conversion module, a second voltage conversion module, and a third voltage conversion module; a first voltage input terminal of the first voltage conversion module is connected to the cathode of the first diode; a first voltage output terminal of the first voltage conversion module is connected to the second voltage input terminal of the second voltage conversion module and the third voltage input terminal of the third voltage conversion module;

[0009] The analog-to-digital conversion device includes: a first voltage input pin of an analog-to-digital converter AD7190 connected to the second voltage output end of the second voltage conversion module, a ninth capacitor, a tenth capacitor, one end of an eleventh capacitor, a positive pin of a feedback signal connected to a strain sensor interface, and a positive reference input pin of the analog-to-digital converter; the other ends of the ninth capacitor, the tenth capacitor, and the eleventh capacitor are all grounded; the second voltage input pin of the analog-to-digital converter connected to the third voltage output end of the third voltage conversion module, the twelfth capacitor, and one end of a thirteenth capacitor are connected; the other ends of the twelfth capacitor and the thirteenth capacitor are both grounded; the positive power supply pin connected to the strain sensor interface is connected to the fourteenth capacitor, the first resistor, one end of the fifteenth capacitor, the negative reference input pin of the analog-to-digital converter, and the bridge low voltage conversion to ground pin; the other ends of the fourteenth capacitor and the first resistor are all grounded; the other end of the fifteenth capacitor is The end is connected to one end of the sixteenth capacitor and the positive reference input pin of the analog-to-digital converter; the other end of the sixteenth capacitor is grounded; the negative pin of the feedback signal connected to the strain sensor interface is connected to one end of the second resistor; the other end of the second resistor is connected to the seventeenth capacitor, one end of the eighteenth capacitor, and the first analog input pin of the analog-to-digital converter; the other end of the seventeenth capacitor is grounded; the other end of the eighteenth capacitor is connected to the third resistor, one end of the nineteenth capacitor, and the second analog input pin of the analog-to-digital converter; the other end of the third resistor is connected to the negative power pin of the strain sensor interface; the other end of the nineteenth capacitor is grounded; the serial data output / data ready output pin of the analog-to-digital converter is connected to the single-chip microcomputer for sending the processed data to the single-chip microcomputer; the strain sensor interface is used to send the voltage difference generated by the strain gauge to the analog-to-digital converter;

[0010] The single chip microcomputer is used to send the data to the wireless data sending device.

[0011] Optionally, the cathode voltage of the first diode is 35V;

[0012] The voltage at the first voltage output terminal of the first voltage conversion module is 5.1V;

[0013] The voltage of the second voltage output terminal of the second voltage conversion module is 5V;

[0014] The voltage of the third voltage output terminal of the third voltage conversion module is 3.3V.

[0015] Optionally, the first voltage conversion module includes:

[0016] The first voltage input terminal is connected to the twentieth capacitor, the twenty-first capacitor, one end of the fourth resistor, and the voltage input pin of the converter;

[0017] The other ends of the 20th capacitor and the 21st capacitor are both grounded; the other end of the fourth resistor is connected to one end of the fifth resistor and the enable pin of the converter; the mode / synchronization pin of the converter is grounded; the other end of the fifth resistor is grounded;

[0018] The first voltage output terminal is connected to the voltage output pin of the converter, the sixth resistor, the twenty-second capacitor, and one end of the twenty-third capacitor;

[0019] The other ends of the 22nd capacitor and the 23rd capacitor are both grounded; the other end of the sixth resistor is connected to the feedback pin of the converter and one end of the seventh resistor; the other end of the seventh resistor is grounded;

[0020] The ground pin and the thermal pad pin of the converter are grounded.

[0021] Optionally, the 20th capacitor is 10 microfarads; the 21st capacitor is 100 nanofarads; the 22nd capacitor is 22 microfarads; the 23rd capacitor is 100 nanofarads;

[0022] The fourth resistor is 220 kilo-ohms; the fifth resistor is 143 kilo-ohms; the sixth resistor is 33 kilo-ohms; and the seventh resistor is 8.06 kilo-ohms.

[0023] Optionally, the second voltage conversion module includes:

[0024] The second voltage input terminal is connected to the twenty-fourth capacitor, the twenty-fifth capacitor, one end of the eighth resistor, and the first voltage input pin, the second voltage input pin, and the soft start control pin of the voltage regulator;

[0025] The other ends of the 24th capacitor and the 25th capacitor are grounded; the other end of the 8th resistor is connected to the enable pin of the voltage regulator;

[0026] The noise reduction pin of the voltage regulator is connected to one end of the twenty-sixth capacitor; the other end of the twenty-sixth capacitor is grounded;

[0027] The first output pin and the second output pin of the voltage regulator are connected to one end of the ninth resistor, the twenty-seventh capacitor, the twenty-eighth capacitor, the twenty-ninth capacitor, the tenth resistor, and the eleventh resistor;

[0028] The other end of the ninth resistor is connected to the other end of the twenty-seventh capacitor, the feedback pin of the voltage regulator, and one end of the twelfth resistor; the other ends of the twelfth resistor, the twenty-eighth capacitor, and the twenty-ninth capacitor are all grounded; the other end of the tenth resistor is connected to the power good indicator pin of the voltage regulator; the other end of the eleventh resistor is connected to one end of the thirtieth capacitor and the second voltage output terminal; the other end of the thirtieth capacitor is grounded;

[0029] The ground pin of the voltage regulator is connected to ground.

[0030] Optionally, the twenty-fourth capacitor is 10 microfarads; the twenty-fifth capacitor is 100 nanofarads; the twenty-sixth capacitor is 100 nanofarads; the twenty-seventh capacitor is 10 nanofarads; the twenty-eighth capacitor is 10 microfarads; the twenty-ninth capacitor is 100 nanofarads; the thirtieth capacitor is 100 nanofarads;

[0031] The eighth resistor is 100 kilo-ohms; the ninth resistor is 10.5 kilo-ohms; the tenth resistor is 20 kilo-ohms; the eleventh resistor is 1-2 ohms; and the twelfth resistor is 2 kilo-ohms.

[0032] Optionally, the third voltage conversion module includes:

[0033] The third voltage input terminal is connected to the thirty-first capacitor, the thirty-second capacitor, one end of the thirteenth resistor, and the voltage input pin of the switching regulator;

[0034] The other ends of the thirty-first capacitor and the thirty-second capacitor are both grounded; the other end of the thirteenth resistor is connected to the enable pin of the switching regulator;

[0035] The voltage selection pin of the switching regulator is connected to one end of a fourteenth resistor; the other end of the fourteenth resistor is grounded;

[0036] The third voltage output terminal is connected to the first inductor, the thirty-third capacitor, one end of the thirty-fourth capacitor, and the detection pin of the switching regulator; the other end of the first inductor is connected to the switch pin of the switching regulator; the other ends of the thirty-third capacitor and the thirty-fourth capacitor are both grounded;

[0037] The ground pin of the switching regulator is grounded;

[0038] The thirty-first capacitor is 4.7 microfarads; the thirty-second capacitor is 100 nanofarads; the thirty-third capacitor is 10 microfarads; the thirty-fourth capacitor is 100 nanofarads; the thirteenth resistor is 100 kilo-ohms; the fourteenth resistor is 249 kilo-ohms; and the first inductor is 470 nanohenry.

[0039] Optionally, the wireless data sending device includes:

[0040] a chip power supply voltage pin of a data transmission chip connected to the third voltage output terminal and one end of a fifteenth resistor;

[0041] The other end of the fifteenth resistor is connected to one end of the sixteenth resistor and the enable pin of the data transmission chip;

[0042] The other end of the sixteenth resistor is connected to the reset pin of the data sending chip;

[0043] A seventeenth resistor, one end of which is connected to the first input pin of the data transmission chip, and the other end of which is connected to one end of an eighteenth resistor and the third voltage output end, and the other end of the eighteenth resistor is connected to the second input pin of the data transmission chip;

[0044] A nineteenth resistor, one end of which is connected to the third input pin of the data transmission chip, and the other end of which is connected to the ground pin of the data transmission chip and is grounded;

[0045] The data receiving pin and the data sending pin of the data sending chip are both connected to the single chip microcomputer and are used to receive data sent by the single chip microcomputer;

[0046] The fifteenth resistor, the seventeenth resistor, the eighteenth resistor and the nineteenth resistor are all 1 megohm.

[0047] Optionally, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, and the eighth capacitor are all 10 microfarads; the ninth capacitor is 4.7 microfarads; the tenth capacitor is 100 nanofarads; the eleventh capacitor is 100 nanofarads; the twelfth capacitor is 4.7 microfarads; the thirteenth capacitor is 100 nanofarads; the fourteenth capacitor is 10 nanofarads; the fifteenth capacitor is 1 microfarad; the sixteenth capacitor is 10 nanofarads; the seventeenth capacitor is 10 nanofarads; the eighteenth capacitor is 1 microfarad; and the nineteenth capacitor is 10 nanofarads;

[0048] The second resistor is 100 ohms; the third resistor is 100 ohms.

[0049] Optionally, the power transmission module includes:

[0050] A direct current input terminal is connected to the thirty-fifth capacitor, the thirty-sixth capacitor, one end of the second inductor, and the voltage input pin and the enable pin of the voltage regulator; the other ends of the thirty-fifth capacitor and the thirty-sixth capacitor are grounded; the ground pin of the voltage regulator is grounded;

[0051] The second inductor has its other end connected to the thirty-seventh capacitor, one end of the thirty-eighth capacitor, and the first switch node pin and the second switch node pin of the regulator;

[0052] The other ends of the thirty-seventh capacitor and the thirty-eighth capacitor are connected to one end of the third inductor and the anode of the second diode; the other end of the third inductor is grounded; the cathode of the second diode is connected to the twentieth resistor, the thirty-ninth capacitor, the fortieth capacitor, one end of the forty-first capacitor, and the second pin of the DC-AC converter;

[0053] The other ends of the thirty-ninth capacitor, the fortieth capacitor, and the forty-first capacitor are all grounded; the other end of the twenty-th resistor is connected to the twenty-first resistor, one end of the twenty-second resistor, and the feedback pin of the voltage regulator; the other end of the twenty-first resistor is grounded; the other end of the twenty-second resistor is connected to the third pin of the transistor; the second pin of the transistor is grounded;

[0054] The first pin of the DC-to-AC module is grounded; the third pin and the fourth pin of the DC-to-AC module are both connected to the transmitting coil;

[0055] The thirty-fifth capacitor is 220 microfarads; the thirty-sixth capacitor is 1 microfarad; the thirty-seventh capacitor is 10 microfarads; the thirty-eighth capacitor is 22 microfarads; the thirty-ninth capacitor is 100 microfarads; the fortieth capacitor is 100 microfarads; the forty-first capacitor is 1 microfarad; the twentieth resistor is 7.15 kilo-ohms; the twenty-first resistor is 1 kilo-ohm; and the twenty-second resistor is 4.99 kilo-ohms.

[0056] It can be seen from the above content that the torque measuring device provided by the embodiment of the present invention includes: a wireless power supply device, a voltage conversion device, an analog-to-digital conversion device, a single-chip microcomputer, and a wireless data transmission device; the wireless power supply device includes: a power transmission transmission module, used to generate a first AC voltage; a transmitting coil, connected to the power transmission transmission module, used to receive the first AC voltage; a receiving coil arranged in parallel with the transmitting coil, used to generate a second AC voltage; an input interface connected to the receiving coil, connected to the first pin of the rectifier bridge through the first voltage input pin, and connected to the second pin of the rectifier bridge through the second voltage input pin; used to send the second AC voltage to the rectifier bridge; the third pin of the rectifier bridge is connected to the positive electrode of the first diode; the fourth pin of the rectifier bridge , connected to the cathode of the first diode; the cathode of the first diode is also connected to one end of the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, and the eighth capacitor; the anode of the first diode is grounded, and connected to the other ends of the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, and the eighth capacitor; the voltage conversion device includes: a first voltage conversion module, a second voltage conversion module, and a third voltage conversion module; the first voltage input terminal of the first voltage conversion module is connected to the cathode of the diode; the first voltage output terminal of the first voltage conversion module is connected to the second voltage input terminal of the second voltage conversion module and the third voltage input terminal of the third voltage conversion module; the module The digital conversion device comprises: a first voltage input pin of an analog-to-digital converter AD7190 connected to a second voltage output end of a second voltage conversion module, a ninth capacitor, a tenth capacitor, one end of an eleventh capacitor, a positive pin of a feedback signal connected to a strain sensor interface, and a positive reference input pin of the analog-to-digital converter; the ninth capacitor, the tenth capacitor, and the eleventh capacitor, the other ends of which are all grounded; a second voltage input pin of an analog-to-digital converter connected to a third voltage output end of a third voltage conversion module, a twelfth capacitor, and one end of a thirteenth capacitor, the other ends of which are all grounded; a positive power supply pin connected to the strain sensor interface, a fourteenth capacitor, a first resistor, one end of a fifteenth capacitor, and a negative reference input pin of the analog-to-digital converter. The pin is connected to the ground pin of the bridge low voltage converter; the other ends of the fourteenth capacitor and the first resistor are both grounded; the other end of the fifteenth capacitor is connected to one end of the sixteenth capacitor and the positive reference input pin of the analog-to-digital converter; the other end of the sixteenth capacitor is grounded; the negative pin of the feedback signal connected to the strain sensor interface is connected to one end of the second resistor; the other end of the second resistor is connected to the seventeenth capacitor, one end of the eighteenth capacitor, and the first analog input pin of the analog-to-digital converter; the other end of the seventeenth capacitor is grounded; the other end of the eighteenth capacitor is connected to the third resistor, one end of the nineteenth capacitor, and the second analog input pin of the analog-to-digital converter; the other end of the third resistor is connected to the negative power pin of the strain sensor interface; the other end of the nineteenth capacitor is grounded;The serial data output / data ready output pin of the analog-to-digital converter is connected to the single-chip microcomputer and is used to send the processed data to the single-chip microcomputer; the strain sensor interface is connected to send the voltage difference generated by the strain gauge to the analog-to-digital converter; the single-chip microcomputer is used to send the data to the wireless data transmission device, so that the voltage signal generated by the strain gauge can be directly led out by connecting to the strain sensor interface, and the process of leading out the voltage signal will not cause any signal fluctuation, thereby improving the accuracy of the torque measurement result. In addition, the analog-to-digital converter AD7190 has a high calculation accuracy. The voltage signal generated by the strain gauge is converted into a digital signal output by the analog-to-digital converter, which can further improve the accuracy of the final torque measurement result. The torque measurement device is powered by a wireless power supply device, which can reduce signal fluctuations compared to the known wired power supply method, thereby improving the accuracy of the torque measurement result. The wireless data transmission device can realize wireless data transmission, which can reduce signal fluctuations caused by friction contact of the slip ring compared to the known method of wired data transmission through a conductive slip ring, thereby improving the accuracy of the torque measurement result. Of course, it is not necessary to achieve all the advantages described above at the same time for any product or method implementing the present invention. ;

[0057] The innovative features of the embodiments of the present invention include:

[0058] 1. By connecting the strain sensor interface, the voltage signal generated by the strain gauge is directly led out. The process of leading out the voltage signal will not cause any signal fluctuation, thereby improving the accuracy of the torque measurement result. In addition, the analog-to-digital converter AD7190 has a high calculation accuracy. By converting the voltage signal generated by the strain gauge into a digital signal output through the analog-to-digital converter, the accuracy of the final torque measurement result can be further improved. The torque measuring device is powered by a wireless power supply device, which can reduce signal fluctuations compared to the known wired power supply method, thereby improving the accuracy of the torque measurement result. Wireless data transmission can be achieved through a wireless data transmission device. Compared with the known method of wired data transmission through a conductive slip ring, the signal fluctuations caused by the friction contact of the slip ring can be reduced, thereby improving the accuracy of the torque measurement result.

[0059] 2. The voltage conversion module can be used to convert the voltage value suitable for the operation of each device in the torque measurement equipment to ensure the normal operation of the torque measurement equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work.

[0061] Figure 1 A schematic diagram of the structure of a torque measuring device according to an embodiment of the present invention;

[0062] Figure 2 A schematic diagram of the structure of a wireless power supply device according to an embodiment of the present invention;

[0063] Figure 3 A schematic diagram of the structure of an analog-to-digital conversion device according to an embodiment of the present invention;

[0064] Figure 4 It is a schematic diagram of the installation appearance of each device in the shaft torque measurement equipment;

[0065] Figure 5 This is a schematic diagram of the actual installation effect of each device in the shaft torque measurement equipment;

[0066] FIG6(a) and FIG6(b) are schematic diagrams showing the actual installation effect of each device in the flywheel series torque measurement equipment;

[0067] Figure 7 A schematic diagram of the structure of a voltage conversion module according to an embodiment of the present invention;

[0068] Figure 8 is a schematic structural diagram of another voltage conversion module according to an embodiment of the present invention;

[0069] Fig. 9 is a schematic structural diagram of another voltage conversion module according to an embodiment of the present invention;

[0070] Fig.10 A schematic diagram of the structure of a wireless data sending device according to an embodiment of the present invention;

[0071] Fig.11 FIG. 4 is a schematic diagram of the structure of a power transmission module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0072] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0073] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present invention and the accompanying drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0074] The embodiment of the invention discloses a torque measuring device, which can improve the accuracy of the torque measurement result.

[0075] In an embodiment of the present invention, the magnitude of the torque applied to the transmission shaft can be measured by attaching a resistance strain gauge to the transmission shaft. In addition, in order to ensure the accuracy of the torque measurement result and reduce the influence of the power supply process and the transmission process of the voltage signal generated by the strain gauge on the torque measurement result, the power supply can be wirelessly supplied, and the voltage signal generated by the strain gauge can be directly led out by connecting the strain sensor interface. The embodiment of the present invention is described in detail below.

[0076] Figure 1 A schematic diagram of a torque measuring device provided by an embodiment of the present invention. The torque measuring device may include: a wireless power supply device 110, a voltage conversion device 120, an analog-to-digital conversion device 130, a single-chip microcomputer 140, and a wireless data transmission device 150.

[0077] The wireless power supply device 110 can power the torque measuring device wirelessly. After the wireless power supply device 110 is powered, since the voltage values ​​required by the various devices in the torque measuring device are different, the voltage generated by the wireless power supply device 110 can be converted into different voltage values ​​by the voltage conversion device 120 to power the corresponding devices. The analog-to-digital conversion device 130 can convert the voltage difference generated by the strain gauge into a digital signal, and transmit it to the wireless data transmission device 150 through the single-chip microcomputer 140, and the digital signal is sent to the signal receiving end through the wireless data transmission device 150.

[0078] Specifically, Figure 2As shown, the wireless power supply device 110 may include: a power transmission module, used to generate a first AC voltage; a transmitting coil, connected to the power transmission module, used to receive the first AC voltage; a receiving coil arranged in parallel with the transmitting coil, used to generate a second AC voltage; an input interface P3 connected to the receiving coil, connected to the first pin of the rectifier bridge D2 through the first voltage input pin, and connected to the second pin of the rectifier bridge D2 through the second voltage input pin; used to send the second AC voltage to the rectifier bridge D2; the third pin of the rectifier bridge D2 is connected to the positive terminal of the first diode D4 The fourth pin of the rectifier bridge D2 is connected to the cathode of the first diode D4; the cathode of the first diode D4 is also connected to one end of the first capacitor C8, the second capacitor C9, the third capacitor C10, the fourth capacitor C11, the fifth capacitor C12, the sixth capacitor C13, the seventh capacitor C14, and the eighth capacitor C15; the anode of the first diode D4 is grounded, and connected to the other end of the first capacitor C8, the second capacitor C9, the third capacitor C10, the fourth capacitor C11, the fifth capacitor C12, the sixth capacitor C13, the seventh capacitor C14, and the eighth capacitor C15.

[0079] The power transmission module converts DC into AC to power the transmitting coil. According to electromagnetic theory, the receiving coil will generate AC. The AC voltage generated by the receiving coil is converted into 35V DC voltage through the rectifier bridge, the first diode and each capacitor, which can power the torque measurement device. Since the transmitting coil and the receiving coil are wirelessly connected, the power supply device is a wireless power supply device.

[0080] The first diode D4, also known as transient voltage suppressor SMAJ33A, has an operating peak reverse voltage of 33V, a minimum breakdown voltage of 36.7V, and a maximum breakdown voltage of 40.6V. The function of each capacitor is filtering and can also play a role in energy storage. The function of D2 is a rectifier bridge, which is AC to DC. D4 is a transient suppression diode, which clamps the voltage at 33V and also plays the role of a protection device.

[0081] The first capacitor C8, the second capacitor C9, the third capacitor C10, the fourth capacitor C11, the fifth capacitor C12, the sixth capacitor C13, the seventh capacitor C14 and the eighth capacitor C15 are all 10 microfarads.

[0082] The voltage conversion device 120 may include: a first voltage conversion module, a second voltage conversion module, and a third voltage conversion module; the first voltage input terminal of the first voltage conversion module is connected to the cathode of the first diode D4; the first voltage output terminal of the first voltage conversion module is connected to the second voltage input terminal of the second voltage conversion module and the third voltage input terminal of the third voltage conversion module.

[0083] That is, the first voltage conversion module is connected to the wireless power supply device 110 to obtain the voltage generated by the wireless power supply module 110, and is converted into different voltage values ​​through the first voltage conversion module, the second voltage conversion module, and the third voltage conversion module respectively.

[0084] like Figure 3As shown, the analog-to-digital conversion device 130 may include: a pin 20 of the analog-to-digital converter AD7190 connected to the second voltage output end of the second voltage conversion module, that is, a first voltage input pin, a ninth capacitor C26, a tenth capacitor C27, and one end of the eleventh capacitor C23, a pin 3 connected to the strain sensor interface P2, that is, a positive pin of the feedback signal, and a pin 15 of the analog-to-digital converter, that is, REFIN1(+)(Reference Input, positive reference input) pin is connected; the ninth capacitor C26, the tenth capacitor C27, and the eleventh capacitor C23, the other ends of which are all grounded; the pin 21 of the analog-to-digital converter connected to the third voltage output end of the third voltage conversion module, that is, the second voltage input pin, the twelfth capacitor C28 and one end of the thirteenth capacitor C29 are connected; the other ends of the twelfth capacitor C28 and the thirteenth capacitor C29 are all grounded; the pin 4 of the strain sensor interface P2, that is, the positive power supply pin, is connected to the fourteenth capacitor C33, the first resistor R17, one end of the fifteenth capacitor C32, and the pin 16 of the analog-to-digital converter, that is, the REFIN1(-) (Reference Input, negative reference input) pin, and pin 17, that is, BPDSW (Bridge Power-Down Switchto AGND, bridge low voltage conversion to ground) pin; the fourteenth capacitor C33, the first resistor R17, the other end are grounded; the fifteenth capacitor C32, the other end is connected to one end of the sixteenth capacitor C25 and the pin 15 of the analog-to-digital converter, that is, REFIN1 (+) (Reference Input, positive reference input) pin; the sixteenth capacitor C25, the other end is grounded; connected to pin 2 of the strain sensor interface P2, that is, the negative feedback signal pin, and connected to one end of the second resistor R15; the second resistor R15, the other end is connected to the seventeenth capacitor C24, one end of the eighteenth capacitor C30, and the pin 13 of the analog-to-digital converter, that is, AIN3 (Analog Input, analog input) pin; the seventeenth capacitor C24, the other end of which is grounded; the eighteenth capacitor C30, the other end of which is connected to the third resistor R16, one end of the nineteenth capacitor C31, and pin 14 of the analog-to-digital converter, namely, pin AIN4; the third resistor R16, the other end of which is connected to pin 1 of the strain sensor interface P2, namely, the negative power pin; the nineteenth capacitor C31, the other end of which is grounded; pin 23 of the analog-to-digital converter, namely, DOUT / RDY (Serial Data Output / Data Ready Output, serial data output / data ready output) pin, is connected to the single-chip microcomputer 140, for sending the processed data to the single-chip microcomputer 140; connected to the strain sensor interface P2, for sending the voltage difference generated by the strain gauge to the analog-to-digital converter.

[0085] In the embodiment of the present invention, the voltage difference generated by the deformation of the strain gauge can be sent to the analog-to-digital converter AD7190 through P2. The analog-to-digital converter AD7190 can also be called an amplifier. The amplifier amplifies the signal and then sends it to the single-chip microcomputer 140. The single-chip microcomputer 140 can send commands to the G1 and G0 ports of the amplifier through SPI to control its amplification factor.

[0086] The AD7190 is a low noise, complete analog front end amplifier for high-end precision measurement applications. The AD7190 also has zero latency and outputs data at a rate of 4.7Hz-4.8kHz. The chip can operate in the range of -40 degrees to 105 degrees.

[0087] When pin AIN3 and pin AIN4 are used together, pin AIN3 can be configured as the positive input of a fully differential input pair, and pin AIN4 can be configured as the negative input of the fully differential input pair.

[0088] The ninth capacitor C26 is 4.7 microfarads; the tenth capacitor C27 is 100 nanofarads; the eleventh capacitor C23 is 100 nanofarads; the twelfth capacitor C28 is 4.7 microfarads; the thirteenth capacitor C29 is 100 nanofarads; the fourteenth capacitor C33 is 10 nanofarads; the fifteenth capacitor C32 is 1 microfarad; the sixteenth capacitor C25 is 10 nanofarads; the seventeenth capacitor C24 is 10 nanofarads; the eighteenth capacitor C30 is 1 microfarad; the nineteenth capacitor C31 is 10 nanofarads; the second resistor R15 is 100 ohms; and the third resistor R16 is 100 ohms.

[0089] The function of each capacitor in the analog-to-digital conversion device 130 is to filter out noise, and the function of the second resistor R15 and the third resistor R16 is to filter out common-mode noise to ensure the accuracy of the analog-to-digital conversion result, thereby improving the accuracy of the torque measurement result.

[0090] The single chip microcomputer 140 is used to send data to the wireless data sending device 150, so that the data can be sent to the receiving end through the wireless data sending device 150.

[0091] It can be seen from the above content that the torque measuring device provided by the embodiment of the present invention can directly lead out the voltage signal generated by the strain gauge by connecting the strain sensor interface. The process of leading out the voltage signal will not cause any signal fluctuation, thereby improving the accuracy of the torque measurement result. In addition, the analog-to-digital converter AD7190 has a high calculation accuracy. The voltage signal generated by the strain gauge is converted into a digital signal output by the analog-to-digital converter, which can further improve the accuracy of the final torque measurement result. The torque measuring device is powered by a wireless power supply device, which can reduce signal fluctuations compared to the known wired power supply method, thereby improving the accuracy of the torque measurement result. Wireless data transmission can be achieved through a wireless data sending device. Compared with the known method of wired data transmission through a conductive slip ring, the signal fluctuations caused by the friction contact of the slip ring can be reduced, thereby improving the accuracy of the torque measurement result.

[0092] In a specific embodiment, Figure 4 As shown, it shows a schematic diagram of the installation appearance of each device in the shaft torque measurement equipment. Correspondingly, Figure 5 The figure is a schematic diagram of the actual installation effect of each device in the shaft torque measurement device. Among them, the installation position of the acquisition board is the installation position of the voltage conversion device, the single chip microcomputer, and the wireless data transmission device in the embodiment of the present invention.

[0093] Figure 6 (a) and Figure 6 (b) are schematic diagrams of an actual installation effect of each device in the flywheel series torque measurement device. Among them, the installation position of the acquisition board is the installation position of the voltage conversion device, the single chip microcomputer, and the wireless data transmission device in the embodiment of the present invention.

[0094] As an implementation of an embodiment of the present invention, the cathode voltage of the first diode D4 is 35V, that is, the output voltage of the wireless power supply device is 35V. The voltage of the first voltage output terminal of the first voltage conversion module is 5.1V; the voltage of the second voltage output terminal of the second voltage conversion module is 5V; the voltage of the third voltage output terminal of the third voltage conversion module is 3.3V.

[0095] In one implementation, Figure 7 As shown, the first voltage conversion module includes:

[0096] A first voltage input terminal connected to the twentieth capacitor C39, the twenty-first capacitor C40, one end of the fourth resistor R29, and the pin 3 of the converter, namely, the VIN (Voltage Input) pin;

[0097] The other ends of the 20th capacitor C39 and the 21st capacitor C40 are both grounded; the other end of the fourth resistor R29 is connected to one end of the fifth resistor R2 and the pin 4 of the converter, i.e., the EN (enable) pin; the pin 2 of the converter, i.e., the MODE / SYNC (mode / synchronization) pin is grounded; the other end of the fifth resistor R2 is grounded;

[0098] The first voltage output terminal is connected to the pin 6 of the converter, namely the VOUT (Voltage Output) pin, the sixth resistor R30, the twenty-second capacitor C41, and one end of the twenty-third capacitor C42;

[0099] The other ends of the twenty-second capacitor C41 and the twenty-third capacitor C42 are both grounded; the other end of the sixth resistor R30 is connected to the pin 7 of the converter, i.e., the FB (Feedback) pin, and one end of the seventh resistor R31; the other end of the seventh resistor R31 is grounded;

[0100] Pin 1 of the converter, ie, the GND (Ground) pin, and pin 11, ie, the PAD (Thermal Pad) pin, are grounded.

[0101] The converter may be LMZM23601SILR. The 35V voltage is converted to a 5.1V voltage through the non-isolated DC / DC converter LMZM23601SILR. The chip LMZM23601SILR has a wide operating input voltage of 1.4V to 36V, and the output voltage is adjustable from 2.5V to 15V.

[0102] Among them, the 20th capacitor C39 is 10 microfarads; the 21st capacitor C40 is 100 nanofarads; the 22nd capacitor C41 is 22 microfarads; and the 23rd capacitor C42 is 100 nanofarads.

[0103] The 20th capacitor C39, the 21st capacitor C40, the 22nd capacitor C41, and the 23rd capacitor C42 all have the function of filtering to obtain a more accurate and stable voltage. The smaller the capacitance, the stronger the high-frequency filtering capability, and the larger the capacitance, the stronger the low-frequency filtering capability. The 20th capacitor C39 and the 22nd capacitor C41 also have the function of energy storage.

[0104] The fourth resistor R29 is 220 kilo-ohms; the fifth resistor R2 is 143 kilo-ohms; the sixth resistor R30 is 33 kilo-ohms; and the seventh resistor R31 is 8.06 kilo-ohms.

[0105] The FB pin voltage is 1 V, so the sixth resistor R30 and the seventh resistor R31 can be used to match the output voltage of 5.1 V. The enable voltage of the LMZM23601SILR chip is 1.8 V, and the external voltage divider is added to set the input voltage for the regulator to start voltage conversion.

[0106] In one implementation, Figure 8 As shown, the second voltage conversion module includes:

[0107] A second voltage input terminal is connected to the twenty-fourth capacitor C16, the twenty-fifth capacitor C17, one end of the eighth resistor R9, and the pin 10 of the regulator, i.e., the VIN (Input, voltage input) pin, the pin 9, i.e., the VIN pin, and the pin 6, i.e., the SS_CTRL (soft start control) pin;

[0108] The other ends of the twenty-fourth capacitor C16 and the twenty-fifth capacitor C17 are grounded; the other end of the eighth resistor R9 is connected to the pin 7 of the voltage regulator, i.e., the EN (enable) pin;

[0109] Pin 8 of the voltage regulator, i.e., the NR / SS (noise reduction) pin, is connected to one end of the twenty-sixth capacitor C18; the other end of the twenty-sixth capacitor C18 is grounded;

[0110] Pin 1 and pin 2 of the voltage regulator, i.e., OUT (output) pins, are connected to one end of the ninth resistor R11, the twenty-seventh capacitor C19, the twenty-eighth capacitor C20, the twenty-ninth capacitor C21, the tenth resistor R12, and the eleventh resistor R13;

[0111] The other end of the ninth resistor R11 is connected to the other end of the twenty-seventh capacitor C19, the pin 3 of the voltage regulator, i.e., the FB (FeedBack) pin, and one end of the twelfth resistor R10; the other ends of the twelfth resistor R10, the twenty-eighth capacitor C20, and the twenty-ninth capacitor C21 are all grounded; the other end of the tenth resistor R12 is connected to the pin 5 of the voltage regulator, i.e., the PG (power-good) pin; the other end of the eleventh resistor R13 is connected to one end of the thirtieth capacitor C22 and the second voltage output terminal; the other end of the thirtieth capacitor C22 is grounded;

[0112] Pin 4 of the voltage regulator, ie, the GND (Ground) pin, is grounded.

[0113] FB pin, used to set the output voltage of the device. PG pin, open drain for the LDO output voltage. SS_CTRL pin, connect this pin to GND or IN to change the NR / SS capacitor charging current. NR / SS pin, connect this pin to an external capacitor to reduce the noise generated by the internal bandgap reference. The external capacitor reduces the output noise to very low levels and sets the output slope to limit the inrush current.

[0114] The above-mentioned voltage regulator can be TPS7A9001DSKR. The TPS7A9001DSKR chip is a low-noise (4.7μVRMS), low-dropout (LDO) voltage regulator capable of providing 500mA current with a maximum voltage drop of only 100mV to 5V and 200mV to 5.7V. Its output can be adjusted by an external resistor from 0.8V to 5.7V. Its input voltage range supports operating voltages as low as 1.4V and as high as 6.5V. It also has 1% output voltage accuracy (over line, load and temperature) and soft start function. It is very suitable for power supply sensitive analog low-voltage devices.

[0115] The above-mentioned twenty-fourth capacitor C16 is 10 microfarads; the twenty-fifth capacitor C17 is 100 nanofarads; the twenty-sixth capacitor C18 is 100 nanofarads; the twenty-seventh capacitor C19 is 10 nanofarads; the twenty-eighth capacitor C20 is 10 microfarads; the twenty-ninth capacitor C21 is 100 nanofarads; and the 30th capacitor C22 is 100 nanofarads.

[0116] The twenty-fourth capacitor C16, the twenty-fifth capacitor C17, the twenty-eighth capacitor C20, and the thirtieth capacitor C22 are used for filtering to obtain a more accurate and stable voltage. The smaller the capacitance, the stronger the high-frequency filtering capability, and the larger the capacitance, the stronger the low-frequency filtering capability. The twenty-fourth capacitor C16 and the twenty-eighth capacitor C20 also have the function of energy storage. The function of the twenty-seventh capacitor C19 is to clip the wave.

[0117] The eighth resistor R9 is 100 kilo-ohms; the ninth resistor R11 is 10.5 kilo-ohms; the tenth resistor R12 is 20 kilo-ohms; the eleventh resistor R13 is 1-2 ohms; and the twelfth resistor R10 is 2 kilo-ohms.

[0118] In one implementation, Fig. 9 As shown, the third voltage conversion module includes:

[0119] A third voltage input terminal is connected to a thirty-first capacitor C35, a thirty-second capacitor C36, one end of a thirteenth resistor R029, and a pin 3 of the switching regulator, namely a VIN (Voltage Input) pin;

[0120] The other ends of the thirty-first capacitor C35 and the thirty-second capacitor C36 are both grounded; the other end of the thirteenth resistor R029 is connected to the pin 6 of the switching regulator, i.e., the EN (enable) pin;

[0121] The pin 5 of the switching regulator, namely the VSEL / MODE pin, is connected to one end of the fourteenth resistor R32; the other end of the fourteenth resistor R32 is grounded;

[0122] The third voltage output terminal is connected to the first inductor L1, the thirty-third capacitor C37, one end of the thirty-fourth capacitor C38, and the pin 2 of the switching regulator, that is, the VOS (detection) pin; the other end of the first inductor L1 is connected to the pin 4 of the switching regulator, that is, the SW (switch) pin; the other ends of the thirty-third capacitor C37 and the thirty-fourth capacitor C38 are both grounded;

[0123] Pin 1 of the switching regulator, ie, the GND (Ground) pin, is grounded.

[0124] The switching regulator may be TPS62802YKAR. The 5.1V voltage is converted to a 3.3V voltage by the switching regulator TPS62802YKAR. The VOS pin is an output voltage detection pin of the internal feedback voltage divider network and the regulation loop.

[0125] The 31st capacitor C35 is 4.7 microfarads; the 32nd capacitor C36 is 100 nanofarads; the 33rd capacitor C37 is 10 microfarads; the 34th capacitor C38 is 100 nanofarads. The 13th resistor R029 is 100 kilo-ohms; the 14th resistor R32 is 249 kilo-ohms. The first inductor L1 is 470 nanohenry.

[0126] The function of the thirteenth resistor R029 is to limit the current to ensure that the chip is not burned. The function of the first inductor L1 is to store energy.

[0127] The functions of the 31st capacitor C35, the 32nd capacitor C36, the 33rd capacitor C37 and the 34th capacitor C38 are all filtering to obtain a more accurate and stable voltage. The smaller the capacitance, the stronger the high-frequency filtering capability; the larger the capacitance, the stronger the low-frequency filtering capability. The 31st capacitor C35 and the 33rd capacitor C37 also have the function of energy storage.

[0128] The voltage conversion module can be used to convert a voltage value suitable for each device in the torque measurement device to ensure the normal operation of the torque measurement device.

[0129] In one implementation, Fig.10 As shown, the wireless data transmitting device 150 includes:

[0130] The pin 8 of the data transmission chip connected to the third voltage output terminal, namely the VCC (Volt Current Condenser, chip power supply voltage) pin and one end of the fifteenth resistor R20;

[0131] The other end of the fifteenth resistor R20 is connected to one end of the sixteenth resistor R19 and the pin 3 of the data transmission chip, namely the EN (enable) pin;

[0132] The other end of the sixteenth resistor R19 is connected to the pin 1 of the data transmission chip, namely the RST (RESET) pin;

[0133] A seventeenth resistor R21, one end of which is connected to the pin 12 of the data transmission chip, that is, the first input pin (IO0), and the other end of which is connected to one end of the eighteenth resistor R22 and the third voltage output terminal, and the other end of which is connected to the pin 11 of the data transmission chip, that is, the second input pin (IO2);

[0134] A nineteenth resistor R23, one end of which is connected to the pin 10 of the data transmission chip, that is, the third input pin (IO15), and the other end of which is connected to the pin 9 of the data transmission chip, that is, GND (Ground), and is grounded;

[0135] The data receiving pin 15, i.e., the RXD0 pin, and the data transmitting pin 16, i.e., the TXD0 pin, of the data transmitting chip are both connected to the single-chip microcomputer 140 and are used to receive data transmitted by the single-chip microcomputer 140;

[0136] The resistances of the fifteenth resistor R20, the seventeenth resistor R21, the eighteenth resistor R22 and the nineteenth resistor R23 are all 1 megohm.

[0137] The wireless data transmission device 150 can also be called a WIFI module. The data transmission chip can be ESP-07S, which includes multiple sub-chips, the most important of which is the ESP8266 chip. The serial ports WIFI_IN_TX and WIFI_IN_RX of the ESP8266 chip are connected to the serial ports UART2_RX and UART2_TX of the microcontroller. The microcontroller sends data to the WIFI module through the serial port, and the WIFI module sends the data to the receiver that receives the WIFI signal, and then displays the measured torque value.

[0138] The operating temperature range of the ESP8266 chip is -45 to 80 degrees. The functions of the above R21, R22, and R23 are mode selection. In the embodiment of the present invention, the data transmission mode is used.

[0139] Pins 10, 11, and 12 are GPIO15, GPIO0, and GPIO2, respectively. These three pins are used to set different modes. For serial port mode, GPIO15 and GPIO0 are set to low, and GPIO2 is set to high. For flash boot, GPIO15 is set to low, and GPIO2 and GPIO0 are set to high.

[0140] In one implementation, Fig.11 As shown, the power transmission module includes:

[0141] The DC input terminal is connected to the 35th capacitor C59, the 36th capacitor C70, one end of the second inductor L5, and the pin 4 of the voltage regulator, i.e., the VIN (Voltage Input) pin, and the pin 2, i.e., the EN (enable) pin; the other ends of the 35th capacitor C59 and the 36th capacitor C70 are grounded; the pin 1 of the voltage regulator, i.e., the GND (Ground) pin is grounded;

[0142] The other end of the second inductor L5 is connected to the thirty-seventh capacitor C80, one end of the thirty-eighth capacitor C1, and pins 3 and 6 of the regulator, i.e., the SW (switch node) pin;

[0143] The other ends of the thirty-seventh capacitor C80 and the thirty-eighth capacitor C1 are connected to one end of the third inductor L4 and the anode of the second diode D5; the other end of the third inductor L4 is grounded; the cathode of the second diode D5 is connected to the twentieth resistor R6, the thirty-ninth capacitor C51, the fortieth capacitor C91, one end of the forty-first capacitor C92, and the second pin of the DC-AC converter module;

[0144] The other ends of the 39th capacitor C51, the 40th capacitor C91, and the 41st capacitor C92 are all grounded; the other end of the 20th resistor R6 is connected to the 21st resistor R60, one end of the 22nd resistor R50, and the pin 5 of the regulator, i.e., the FB (FeedBack) pin; the other end of the 21st resistor R60 is grounded; the other end of the 22nd resistor R50 is connected to the third pin of the transistor Q2; the second pin of the transistor Q2 is grounded;

[0145] The first pin of the DC-to-AC module is grounded; the third pin and the fourth pin of the DC-to-AC module are both connected to the transmitting coil.

[0146] The voltage regulator can be XL6009E1. The input DC voltage is output as the voltage required by the coil through the XL6009E1 voltage regulator. This voltage regulator has a wide input range and can generate positive and negative voltages.

[0147] The above-mentioned thirty-fifth capacitor C59 is 220 microfarads; the thirty-sixth capacitor C70 is 1 microfarad; the thirty-seventh capacitor C80 is 10 microfarads; the thirty-eighth capacitor C1 is 22 microfarads; the thirty-ninth capacitor C51 is 100 microfarads; the fortieth capacitor C91 is 100 microfarads; the forty-first capacitor C92 is 1 microfarad; the twentieth resistor R6 is 7.15 kilo-ohms; the twenty-first resistor R60 is 1 kilo-ohm; and the twenty-second resistor R50 is 4.99 kilo-ohms.

[0148] The third inductor L4, the second inductor L5, and the thirty-eighth capacitor C1 are used to store energy. The twentieth resistor R6, the twenty-first resistor R60, the twenty-second resistor R50, and the transistor Q2 are used to adjust the amplitude of the voltage output.

[0149] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present invention.

[0150] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A torque measuring device, characterized in that: include: A wireless power supply device, a voltage conversion device, an analog-to-digital conversion device, a single-chip microcomputer, and a wireless data transmission device; The wireless power supply device comprises: a power transmission module, used for generating a first AC voltage; a transmitting coil, connected to the power transmission module, used for receiving the first AC voltage; a receiving coil arranged in parallel with the transmitting coil, used for generating a second AC voltage; an input interface (P3) connected to the receiving coil, connected to a first pin of a rectifier bridge (D2) through a first voltage input pin, and connected to a second pin of the rectifier bridge (D2) through a second voltage input pin; used for sending the second AC voltage to the rectifier bridge (D2); a third pin of the rectifier bridge (D2) connected to the positive electrode of a first diode (D4); a fourth pin connected to the cathode of the first diode (D4); the cathode of the first diode (D4) is also connected to one end of the first capacitor (C8), the second capacitor (C9), the third capacitor (C10), the fourth capacitor (C11), the fifth capacitor (C12), the sixth capacitor (C13), the seventh capacitor (C14), and the eighth capacitor (C15); the anode of the first diode (D4) is grounded and connected to the other ends of the first capacitor (C8), the second capacitor (C9), the third capacitor (C10), the fourth capacitor (C11), the fifth capacitor (C12), the sixth capacitor (C13), the seventh capacitor (C14), and the eighth capacitor (C15); The voltage conversion device comprises: a first voltage conversion module, a second voltage conversion module, and a third voltage conversion module; the first voltage input terminal of the first voltage conversion module is connected to the cathode of the first diode (D4); the first voltage output terminal of the first voltage conversion module is connected to the second voltage input terminal of the second voltage conversion module and the third voltage input terminal of the third voltage conversion module; The analog-to-digital conversion device comprises: a first voltage input pin of an analog-to-digital converter AD7190 connected to the second voltage output end of the second voltage conversion module, a ninth capacitor (C26), a tenth capacitor (C27), one end of an eleventh capacitor (C23), a positive pin of a feedback signal connected to a strain sensor interface (P2), and a positive reference input pin of the analog-to-digital converter; the other ends of the ninth capacitor (C26), the tenth capacitor (C27), and the eleventh capacitor (C23) are all grounded; the analog-to-digital converter connected to the third voltage output end of the third voltage conversion module The second voltage input pin of the device, the twelfth capacitor (C28) and one end of the thirteenth capacitor (C29) are connected; the other ends of the twelfth capacitor (C28) and the thirteenth capacitor (C29) are grounded; the positive power supply pin of the strain sensor interface (P2) is connected to the fourteenth capacitor (C33), the first resistor (R17), one end of the fifteenth capacitor (C32), the negative reference input pin of the analog-to-digital converter, and the bridge low voltage conversion to the ground pin; the other ends of the fourteenth capacitor (C33) and the first resistor (R17) are grounded; the fifteenth capacitor (C32), the other end of which is connected to one end of the sixteenth capacitor (C25) and the positive reference input pin of the analog-to-digital converter; the other end of the sixteenth capacitor (C25) is grounded; the negative feedback signal pin of the strain sensor interface (P2) is connected to one end of the second resistor (R15); the other end of the second resistor (R15) is connected to the seventeenth capacitor (C24), one end of the eighteenth capacitor (C30), and the first analog input pin of the analog-to-digital converter; the other end of the seventeenth capacitor (C24) is grounded; the other end of the eighteenth capacitor (C30) is grounded. One end is connected to the third resistor (R16), one end of the nineteenth capacitor (C31), and the second analog input pin of the analog-to-digital converter; the other end of the third resistor (R16) is connected to the negative power pin of the strain sensor interface (P2); the other end of the nineteenth capacitor (C31) is grounded; the serial data output / data ready output pin of the analog-to-digital converter is connected to the single-chip microcomputer, and is used to send processed data to the single-chip microcomputer; the strain sensor interface (P2) is used to send the voltage difference generated by the strain gauge to the analog-to-digital converter; The single chip microcomputer is used to send the data to the wireless data sending device.

2. The device according to claim 1, characterized in that The cathode of the first diode (D4) has a voltage of 35V; The voltage at the first voltage output terminal of the first voltage conversion module is 5.1V; The voltage of the second voltage output terminal of the second voltage conversion module is 5V; The voltage of the third voltage output terminal of the third voltage conversion module is 3.3V.

3. The device according to claim 2, characterized in that The first voltage conversion module includes: The first voltage input terminal is connected to the twentieth capacitor (C39), the twenty-first capacitor (C40), one end of the fourth resistor (R29), and the voltage input pin of the converter; The other ends of the 20th capacitor (C39) and the 21st capacitor (C40) are both grounded; the other end of the fourth resistor (R29) is connected to one end of the fifth resistor (R2) and the enable pin of the converter; the mode / synchronization pin of the converter is grounded; the other end of the fifth resistor (R2) is grounded; The first voltage output terminal is connected to the voltage output pin of the converter, a sixth resistor (R30), a twenty-second capacitor (C41), and one end of a twenty-third capacitor (C42); The other ends of the 22nd capacitor (C41) and the 23rd capacitor (C42) are both grounded; the other end of the sixth resistor (R30) is connected to the feedback pin of the converter and one end of the seventh resistor (R31); the other end of the seventh resistor (R31) is grounded; The ground pin and the thermal pad pin of the converter are grounded.

4. The device according to claim 3, characterized in that The 20th capacitor (C39) is 10 microfarads; the 21st capacitor (C40) is 100 nanofarads; the 22nd capacitor (C41) is 22 microfarads; the 23rd capacitor (C42) is 100 nanofarads; The fourth resistor (R29) is 220 kilo-ohms; the fifth resistor (R2) is 143 kilo-ohms; the sixth resistor (R30) is 33 kilo-ohms; and the seventh resistor (R31) is 8.06 kilo-ohms.

5. The device according to claim 2, characterized in that The second voltage conversion module includes: The second voltage input terminal is connected to the twenty-fourth capacitor (C16), the twenty-fifth capacitor (C17), one end of the eighth resistor (R9), and the first voltage input pin, the second voltage input pin, and the soft start control pin of the voltage regulator; The other ends of the 24th capacitor (C16) and the 25th capacitor (C17) are grounded; the other end of the eighth resistor (R9) is connected to the enable pin of the voltage regulator; The noise reduction pin of the voltage regulator is connected to one end of the twenty-sixth capacitor (C18); the other end of the twenty-sixth capacitor (C18) is grounded; The first output pin and the second output pin of the voltage regulator are connected to one end of the ninth resistor (R11), the twenty-seventh capacitor (C19), the twenty-eighth capacitor (C20), the twenty-ninth capacitor (C21), the tenth resistor (R12), and the eleventh resistor (R13); The other end of the ninth resistor (R11) is connected to the other end of the twenty-seventh capacitor (C19), the feedback pin of the voltage regulator, and one end of the twelfth resistor (R10); the other ends of the twelfth resistor (R10), the twenty-eighth capacitor (C20), and the twenty-ninth capacitor (C21) are all grounded; the other end of the tenth resistor (R12) is connected to the power good indicator pin of the voltage regulator; the other end of the eleventh resistor (R13) is connected to one end of the thirtieth capacitor (C22) and the second voltage output terminal; the other end of the thirtieth capacitor (C22) is grounded; The ground pin of the voltage regulator is connected to ground.

6. The device according to claim 5, characterized in that The 24th capacitor (C16) is 10 microfarads; the 25th capacitor (C17) is 100 nanofarads; the 26th capacitor (C18) is 100 nanofarads; the 27th capacitor (C19) is 10 nanofarads; the 28th capacitor (C20) is 10 microfarads; the 29th capacitor (C21) is 100 nanofarads; the 30th capacitor (C22) is 100 nanofarads; The eighth resistor (R9) is 100 kilo-ohms; the ninth resistor (R11) is 10.5 kilo-ohms; the tenth resistor (R12) is 20 kilo-ohms; the eleventh resistor (R13) is 1-2 ohms; and the twelfth resistor (R10) is 2 kilo-ohms.

7. The device according to claim 2, characterized in that The third voltage conversion module comprises: The third voltage input terminal is connected to a thirty-first capacitor (C35), a thirty-second capacitor (C36), one end of a thirteenth resistor (R029), and a voltage input pin of the switching regulator; The other ends of the thirty-first capacitor (C35) and the thirty-second capacitor (C36) are both grounded; the other end of the thirteenth resistor (R029) is connected to the enable pin of the switching regulator; The voltage selection pin of the switching regulator is connected to one end of a fourteenth resistor (R32); the other end of the fourteenth resistor (R32) is grounded; The third voltage output terminal is connected to the first inductor (L1), the thirty-third capacitor (C37), one end of the thirty-fourth capacitor (C38), and the detection pin of the switching regulator; the other end of the first inductor (L1) is connected to the switch pin of the switching regulator; the other ends of the thirty-third capacitor (C37) and the thirty-fourth capacitor (C38) are both grounded; The ground pin of the switching regulator is grounded; The thirty-first capacitor (C35) is 4.7 microfarads; the thirty-second capacitor (C36) is 100 nanofarads; the thirty-third capacitor (C37) is 10 microfarads; the thirty-fourth capacitor (C38) is 100 nanofarads; the thirteenth resistor (R029) is 100 kilo-ohms; the fourteenth resistor (R32) is 249 kilo-ohms; and the first inductor (L1) is 470 nanohenries.

8. The device according to any one of claims 1 to 7, characterized in that: The wireless data transmitting device comprises: a chip power supply voltage pin of a data transmission chip connected to the third voltage output terminal and one end of a fifteenth resistor (R20); The other end of the fifteenth resistor (R20) is connected to one end of the sixteenth resistor (R19) and the enable pin of the data transmission chip; The other end of the sixteenth resistor (R19) is connected to the reset pin of the data sending chip; a seventeenth resistor (R21), one end of which is connected to the first input pin of the data transmission chip, and the other end of which is connected to one end of an eighteenth resistor (R22) and the third voltage output end, and the other end of the eighteenth resistor (R22) is connected to the second input pin of the data transmission chip; a nineteenth resistor (R23), one end of which is connected to the third input pin of the data transmission chip, and the other end of which is connected to the ground pin of the data transmission chip and is grounded; The data receiving pin and the data sending pin of the data sending chip are both connected to the single chip microcomputer and are used to receive data sent by the single chip microcomputer; The fifteenth resistor (R20), the seventeenth resistor (R21), the eighteenth resistor (R22), and the nineteenth resistor (R23) are all 1 megohm.

9. The device according to any one of claims 1 to 7, characterized in that: The first capacitor (C8), the second capacitor (C9), the third capacitor (C10), the fourth capacitor (C11), the fifth capacitor (C12), the sixth capacitor (C13), the seventh capacitor (C14), and the eighth capacitor (C15) are all 10 microfarads; the ninth capacitor (C26) is 4.7 microfarads; the tenth capacitor (C27) is 100 nanofarads; the eleventh capacitor (C23) is 100 nanofarads; the twelfth capacitor (C28) is 4.7 microfarads; the thirteenth capacitor (C29) is 100 nanofarads; the fourteenth capacitor (C33) is 10 nanofarads; the fifteenth capacitor (C32) is 1 microfarad; the sixteenth capacitor (C25) is 10 nanofarads; the seventeenth capacitor (C24) is 10 nanofarads; the eighteenth capacitor (C30) is 1 microfarad; and the nineteenth capacitor (C31) is 10 nanofarads; The second resistor (R15) is 100 ohms; the third resistor (R16) is 100 ohms.

10. The device according to any one of claims 1 to 7, characterized in that: The power transmission module comprises: A direct current input terminal is connected to a thirty-fifth capacitor (C59), a thirty-sixth capacitor (C70), one end of the second inductor (L5), and a voltage input pin and an enable pin of the voltage regulator; the other ends of the thirty-fifth capacitor (C59) and the thirty-sixth capacitor (C70) are grounded; and the ground pin of the voltage regulator is grounded; The second inductor (L5), the other end of which is connected to the thirty-seventh capacitor (C80), one end of the thirty-eighth capacitor (C1), and the first switch node pin and the second switch node pin of the regulator; The other ends of the thirty-seventh capacitor (C80) and the thirty-eighth capacitor (C1) are connected to one end of the third inductor (L4) and the positive electrode of the second diode (D5); the other end of the third inductor (L4) is grounded; the cathode of the second diode (D5) is connected to the twentieth resistor (R6), the thirty-ninth capacitor (C51), the fortieth capacitor (C91), one end of the forty-first capacitor (C92), and the second pin of the DC-AC converter module; The other ends of the thirty-ninth capacitor (C51), the fortieth capacitor (C91), and the forty-first capacitor (C92) are all grounded; the other end of the 20th resistor (R6) is connected to the twenty-first resistor (R60), one end of the twenty-second resistor (R50), and the feedback pin of the regulator; the other end of the twenty-first resistor (R60) is grounded; the other end of the twenty-second resistor (R50) is connected to the third pin of the transistor (Q2); the second pin of the transistor (Q2) is grounded; The first pin of the DC-to-AC module is grounded; the third pin and the fourth pin of the DC-to-AC module are both connected to the transmitting coil; The thirty-fifth capacitor (C59) is 220 microfarads; the thirty-sixth capacitor (C70) is 1 microfarad; the thirty-seventh capacitor (C80) is 10 microfarads; the thirty-eighth capacitor (C1) is 22 microfarads; the thirty-ninth capacitor (C51) is 100 microfarads; the fortieth capacitor (C91) is 100 microfarads; the forty-first capacitor (C92) is 1 microfarad; the twentieth resistor (R6) is 7.15 kilo-ohms; the twenty-first resistor (R60) is 1 kilo-ohm; and the twenty-second resistor (R50) is 4.99 kilo-ohms.

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