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: a strain sensor interface connected to the second voltage output end of the second voltage conversion module; the strain sensor interface is connected to the analog-to-digital converter ISL28533; the single-ended output pin of the analog-to-digital converter is connected to the single-chip microcomputer, for sending 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; the single-chip microcomputer is used to send data to the wireless data transmission device. The solution provided by the embodiment of the present invention can improve the efficiency of torque measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of torque measurement, and in particular to a torque measuring 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. The slip rings are generally made of copper, and the brushes are divided into carbon brushes and metal brushes. The process of leading out the output voltage signal through the mechanical method of slip rings and brushes is relatively time-consuming, resulting in low efficiency of the torque measurement process. Summary of the invention

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

[0006] A torque measuring device, characterized in that it comprises: 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 ninth capacitor and a tenth capacitor connected to the second voltage output end, and a positive pin of a feedback signal connected to a strain sensor interface; the other ends of the ninth capacitor and the tenth capacitor are both grounded; the positive pin of the power supply connected to the strain sensor interface is grounded; the negative pin of the feedback signal connected to the strain sensor interface is connected to one end of a first resistor; the other end of the first resistor is connected to the eleventh capacitor, one end of the twelfth capacitor, and a positive differential input pin of an analog-to-digital converter ISL28533; the other end of the eleventh capacitor is grounded; the other end of the twelfth capacitor is connected to the second resistor, one end of the thirteenth capacitor, and a negative differential input pin of the analog-to-digital converter; the other end of the second resistor is connected to the negative pole of the power supply connected to the strain sensor interface; the other end of the thirteenth capacitor is grounded; the negative voltage input ground pin of the analog-to-digital converter is grounded; the fourteenth capacitor and the fifteenth capacitor connected to the third voltage input end, the third resistor, one end of the fourth resistor, and the positive voltage input pin of the analog-to-digital converter; The other ends of the capacitor and the fifteenth capacitor are grounded; the other ends of the third resistor are connected to one end of the fifth resistor and the sixth resistor; the other ends of the fourth resistor are connected to one end of the seventh resistor and the eighth resistor; the other ends of the fifth resistor and the seventh resistor are grounded; the other end of the sixth resistor is connected to the first gain control logic input pin of the analog-to-digital converter; the other end of the eighth resistor is connected to the second gain control logic input pin of the analog-to-digital converter; the non-inverting operational amplifier input pin, the auxiliary amplifier output pin, and the output reference pin of the analog-to-digital converter are all connected to one end of the sixteenth capacitor, and the other end of the sixteenth capacitor is grounded; the single-ended output pin of the analog-to-digital converter is connected to one end of the ninth resistor; the other end of the ninth resistor is connected to one end of the seventeenth capacitor, and the other end of the seventeenth capacitor is grounded; the single-ended 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 eighteenth capacitor, the nineteenth capacitor, one end of the tenth resistor, and the voltage input pin of the converter;

[0017] The other ends of the eighteenth capacitor and the nineteenth capacitor are both grounded; the other end of the tenth resistor is connected to one end of the eleventh resistor and the enable pin of the converter; the mode / synchronization pin of the converter is grounded; the other end of the eleventh resistor is grounded;

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

[0019] The other ends of the 20th capacitor and the 21st capacitor are both grounded; the other end of the 12th resistor is connected to the feedback pin of the converter and one end of the 13th resistor; the other end of the 13th resistor is grounded;

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

[0021] Optionally, the eighteenth capacitor is 10 microfarads; the nineteenth capacitor is 100 nanofarads; the twentieth capacitor is 22 microfarads; and the twenty-first capacitor is 100 nanofarads;

[0022] The tenth resistor is 220 kilo-ohms; the eleventh resistor is 143 kilo-ohms; the twelfth resistor is 33 kilo-ohms; and the thirteenth 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-second capacitor, the twenty-third capacitor, one end of the fourteenth resistor, 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 22nd capacitor and the 23rd capacitor are grounded; the other end of the 14th resistor is connected to the enable pin of the regulator;

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

[0027] The first output pin and the second output pin of the voltage regulator are connected to the fifteenth resistor, the twenty-fifth capacitor, the twenty-sixth capacitor, the twenty-seventh capacitor, the sixteenth resistor, and one end of the seventeenth resistor;

[0028] The other end of the fifteenth resistor is connected to the other end of the twenty-fifth capacitor, the feedback pin of the voltage regulator, and one end of the eighteenth resistor; the other ends of the eighteenth resistor, the twenty-sixth capacitor, and the twenty-seventh capacitor are all grounded; the other end of the sixteenth resistor is connected to the power good indicator pin of the voltage regulator; the other end of the seventeenth resistor is connected to one end of the twenty-eighth capacitor and the second voltage output terminal; the other end of the twenty-eighth capacitor is grounded;

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

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

[0031] The fourteenth resistor is 100 kilo-ohms; the fifteenth resistor is 10.5 kilo-ohms; the sixteenth resistor is 20 kilo-ohms; the seventeenth resistor is 1-2 ohms; and the eighteenth resistor is 2 kilo-ohms.

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

[0033] The third voltage input terminal is connected to the twenty-ninth capacitor, the thirtieth capacitor, one end of the nineteenth resistor, and the voltage input pin of the switching regulator;

[0034] The other ends of the 29th capacitor and the 30th capacitor are both grounded; the other end of the 19th 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 the twentieth resistor; the other end of the twentieth resistor is grounded;

[0036] The third voltage output terminal is connected to the first inductor, the thirty-first capacitor, one end of the thirty-second 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-first capacitor and the thirty-second capacitor are both grounded;

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

[0038] The 29th capacitor is 4.7 microfarads; the 30th capacitor is 100 nanofarads; the 31st capacitor is 10 microfarads; the 32nd capacitor is 100 nanofarads; the 19th resistor is 100 kilo-ohms; the 20th resistor is 249 kilo-ohms; and the 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 twenty-first resistor;

[0041] The other end of the twenty-first resistor is connected to one end of the twenty-second resistor and the enable pin of the data transmitting chip;

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

[0043] A twenty-third resistor, one end of which is connected to the first input pin of the data transmission chip, the other end of which is connected to one end of a twenty-fourth resistor and the third voltage output end, and the other end of the twenty-fourth resistor is connected to the second input pin of the data transmission chip;

[0044] A twenty-fifth 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 21st resistor, the 23rd resistor, the 24th resistor and the 25th 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 100 nanofarads; the tenth capacitor is 4.7 microfarads; the eleventh capacitor is 10 nanofarads; the twelfth capacitor is 1 microfarad; the thirteenth capacitor is 10 nanofarads; the fourteenth capacitor is 4.7 microfarads; the fifteenth capacitor is 100 nanofarads; the sixteenth capacitor is 100 picofarads; and the seventeenth capacitor is 10 nanofarads;

[0048] The first resistor is 100 ohms; the second resistor is 100 ohms; the third resistor is 100 kiloohms; the fourth resistor is 100 kiloohms; the fifth resistor is 100 kiloohms; the sixth resistor is 100 ohms; the seventh resistor is 100 kiloohms; the eighth resistor is 100 ohms; and the ninth resistor is 100 ohms.

[0049] Optionally, the power transmission module includes:

[0050] A direct current input terminal is connected to the thirty-third capacitor, the thirty-fourth 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-third capacitor and the thirty-fourth capacitor are grounded; the ground pin of the voltage regulator is grounded;

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

[0052] The other ends of the thirty-fifth capacitor and the thirty-sixth 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 twenty-sixth resistor, the thirty-seventh capacitor, the thirty-eighth capacitor, one end of the thirty-ninth capacitor, and the second pin of the DC-AC converter module;

[0053] The other ends of the thirty-seventh capacitor, the thirty-eighth capacitor and the thirty-ninth capacitor are all grounded; the other end of the twenty-sixth resistor is connected to the twenty-seventh resistor, one end of the twenty-eighth resistor and the feedback pin of the voltage regulator; the other end of the twenty-seventh resistor is grounded; the other end of the twenty-eighth 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-third capacitor is 220 microfarads; the thirty-fourth capacitor is 1 microfarad; the thirty-fifth capacitor is 10 microfarads; the thirty-sixth capacitor is 22 microfarads; the thirty-seventh capacitor is 100 microfarads; the thirty-eighth capacitor is 100 microfarads; the thirty-ninth capacitor is 1 microfarad;

[0056] The twenty-sixth resistor is 7.15 kilo-ohms; the twenty-seventh resistor is 1 kilo-ohm; and the twenty-eighth resistor is 4.99 kilo-ohms.

[0057] 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 rectifier The fourth pin of the current bridge is 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 end of the first voltage conversion module is connected to the cathode of the diode; the first voltage output end of the first voltage conversion module is connected to the second voltage input end of the second voltage conversion module and the third voltage conversion module The third voltage input terminal of the module is connected; the analog-to-digital conversion device includes: a ninth capacitor and a tenth capacitor connected to the second voltage output terminal, and a positive pin of the feedback signal connected to the strain sensor interface; the ninth capacitor and the tenth capacitor, the other ends of which are both grounded; the positive power supply pin connected to the strain sensor interface is grounded; the negative pin of the feedback signal connected to the strain sensor interface is connected to one end of the first resistor; the first resistor, the other end is connected to the eleventh capacitor, one end of the twelfth capacitor, and the positive differential input pin of the analog-to-digital converter ISL28533; the eleventh capacitor, the other end is grounded; the twelfth capacitor, the other end is connected to the second resistor, one end of the thirteenth capacitor, and the negative differential input pin of the analog-to-digital converter; the second resistor, the other end is connected to The negative pole of the power supply of the strain sensor interface is connected; the other end of the thirteenth capacitor is grounded; the negative voltage input ground pin of the analog-to-digital converter is grounded; the fourteenth capacitor, the fifteenth capacitor, the third resistor, one end of the fourth resistor, and the positive voltage input pin of the analog-to-digital converter are connected to the third voltage input terminal; the other ends of the fourteenth capacitor and the fifteenth capacitor are grounded; the other ends of the third resistor are connected to one end of the fifth resistor and the sixth resistor; the other end of the fourth resistor is connected to one end of the seventh resistor and the eighth resistor; the other ends of the fifth resistor and the seventh resistor are grounded; the other end of the sixth resistor is connected to the first gain control logic input pin of the analog-to-digital converter; the other end of the eighth resistor is connected to the second gain control logic input pin of the analog-to-digital converter;The non-inverting operational amplifier input pin, auxiliary amplifier output pin, and output reference pin of the analog-to-digital converter are all connected to one end of the sixteenth capacitor, and the other end of the sixteenth capacitor is grounded; the single-ended output pin of the analog-to-digital converter is connected to one end of the ninth resistor; the other end of the ninth resistor is connected to one end of the seventeenth capacitor, and the other end of the seventeenth capacitor is grounded; the single-ended 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, so that the voltage signal generated by the strain gauge can be directly led out by connecting the strain sensor interface. The process of leading the voltage signal is an electrical signal transmission method, which is more efficient than the mechanical method, thereby improving the efficiency of torque measurement. In addition, the process of leading the voltage signal will not cause any signal fluctuations, thereby improving the accuracy of the torque measurement result. The analog-to-digital converter ISL28533 has a high calculation rate. 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 efficiency of torque measurement. By using a wireless power supply device to power the torque measuring device, compared with the known wired power supply method, the signal fluctuation can be reduced, thereby improving the accuracy of the torque measurement result. By using a wireless data transmission device, wireless data transmission can be achieved. Compared with the known wired data transmission method through a conductive slip ring, the signal fluctuation caused by the friction contact of the slip ring can be reduced, 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 when implementing any product or method of the present invention. ;

[0058] The innovative features of the embodiments of the present invention include:

[0059] 1. By connecting the strain sensor interface, the voltage signal generated by the strain gauge is directly led out. The process of leading the voltage signal is an electrical signal transmission method, which is more efficient than the mechanical method, thereby improving the efficiency of torque measurement. In addition, the process of leading the voltage signal will not cause any signal fluctuations, thereby improving the accuracy of the torque measurement results. The analog-to-digital converter ISL28533 has a high calculation rate. By converting the voltage signal generated by the strain gauge into a digital signal output through the analog-to-digital converter, the efficiency of torque measurement 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 results. 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 results.

[0060] 2. The voltage conversion module can be used to convert the voltage value suitable for the operation of each device in the torque measuring equipment to ensure the normal operation of the torque measuring equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] 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.

[0062] Figure 1 A schematic diagram of the structure of a torque measuring device according to an embodiment of the present invention;

[0063] Figure 2 A schematic diagram of the structure of a wireless power supply device according to an embodiment of the present invention;

[0064] Figure 3 A schematic diagram of the structure of an analog-to-digital conversion device according to an embodiment of the present invention;

[0065] Figure 4 It is a schematic diagram of the installation appearance of each device in the shaft torque measuring equipment;

[0066] Figure 5 This is a schematic diagram of the actual installation effect of each device in the shaft torque measurement equipment;

[0067] FIG6(a) and FIG6(b) are schematic diagrams showing the actual installation effect of each device in the flywheel series torque measuring equipment;

[0068] Figure 7 A schematic diagram of the structure of a voltage conversion module according to an embodiment of the present invention;

[0069] Figure 8 is a schematic structural diagram of another voltage conversion module according to an embodiment of the present invention;

[0070] Fig. 9 is a schematic structural diagram of another voltage conversion module according to an embodiment of the present invention;

[0071] Fig.10 A schematic diagram of the structure of a wireless data sending device according to an embodiment of the present invention;

[0072] 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

[0073] 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.

[0074] 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.

[0075] The embodiment of the invention discloses a torque measuring device, which can improve the efficiency of torque measurement.

[0076] In an embodiment of the present invention, the magnitude of the torque applied to the transmission shaft can be measured by pasting a resistance strain gauge on the transmission shaft. In addition, in order to improve the efficiency of torque measurement, the voltage signal generated by the strain gauge can be led out by connecting the strain sensor interface in a non-mechanical manner. Power can also be supplied wirelessly to reduce the influence of the wired power supply process on the torque measurement result and improve the accuracy of the torque measurement result. The embodiment of the present invention is described in detail below.

[0077] Figure 1 A schematic diagram of a torque measuring device provided in 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.

[0078] The wireless power supply device 110 can supply power to the torque measuring device wirelessly. After the wireless power supply device 110 supplies power, 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 supply power to 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.

[0079] 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.

[0080] 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 a rectifier bridge, a diode and various capacitors to 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] like Figure 3As shown, the analog-to-digital conversion device 130 may include: a ninth capacitor C26 and a tenth capacitor C27 connected to the second voltage output terminal, and pin 3 connected to the strain sensor interface P2, that is, the positive pin of the feedback signal; the ninth capacitor C26 and the tenth capacitor C27, the other ends of which are both grounded; pin 4 connected to the strain sensor interface P2, that is, the positive power supply pin is grounded; pin 2 connected to the strain sensor interface P2, that is, the negative pin of the feedback signal, is connected to one end of the first resistor R15; the first resistor R15, the other end of which is connected to the eleventh capacitor C24, one end of the twelfth capacitor C30, and pin 4 of the analog-to-digital converter ISL28533, that is, INA+ (Positive Differential Input) pin; the eleventh capacitor C24, the other end of which is grounded; the twelfth capacitor C30, the other end of which is connected to the second resistor R16, one end of the thirteenth capacitor C31, and pin 5 of the analog-to-digital converter, that is, INA- (Negative Differential Input) Input, negative differential input) pin; the second resistor R16, the other end is connected to pin 1 of the strain sensor interface P2, that is, the negative power pin; the thirteenth capacitor C31, the other end is grounded; pin 7 of the analog-to-digital converter, that is, V- (Negative supply, negative voltage input grounding) pin, is grounded; the fourteenth capacitor C32, the fifteenth capacitor C28, the third resistor R25, one end of the fourth resistor R17 connected to the third voltage input terminal, and pin 14 of the analog-to-digital converter, that is, V+ (Positive supply, positive voltage input) pin are connected; the fourteenth capacitor C32 and the fifteenth capacitor C28, the other ends are both grounded; the third resistor R25, the other end is connected to one end of the fifth resistor R26 and the sixth resistor R33; the fourth resistor R17, the other end is connected to one end of the seventh resistor R27 and the eighth resistor R34; the fifth resistor R26 and the seventh resistor R27, the other ends are both grounded; the sixth resistor R33, the other end is connected to pin 2 of the analog-to-digital converter, that is, G1 (Gain Control The eighth resistor R34, the other end of which is connected to the pin 1 of the analog-to-digital converter, namely the G0 (Gain Control Logic Input) pin; the pin 9 of the analog-to-digital converter, namely the IN- (Non-Inverting Op Amp Input) pin, the pin 10, namely the OUT (Auxiliary Amplifier OUT) pin, and the pin 11, namely the REF (INA Output Reference) pin, are all connected to one end of the sixteenth capacitor C33, and the other end of the sixteenth capacitor C33 is grounded;The pin 12 of the analog-to-digital converter, namely the OUTA (Single Ended Output) pin, is connected to one end of the ninth resistor R28; the other end of the ninth resistor R28 is connected to one end of the seventeenth capacitor C43, and the other end of the seventeenth capacitor C43 is grounded; the OUTA pin of the analog-to-digital converter is connected to the single-chip microcomputer 140, and is used to send the processed data to the single-chip microcomputer 140; it is connected to the strain sensor interface P2, and is used to send the voltage difference generated by the strain gauge to the analog-to-digital converter.;

[0086] 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 ISL28533 through P2. The analog-to-digital converter ISL28533 can also be called an amplifier. The amplifier amplifies the signal and sends it to the microcontroller 140 through OUTA.

[0087] The ISL28535 is a programmable gain instrumentation amplifier with low offset, low noise, low gain error and high CMRR for high-end precision measurement applications. It uses a unique 2-bit, 3-state logic interface design to support 9 gain settings.

[0088] In the embodiment of the present invention, the magnification can be selected as 500 or 300 times (i.e., G1 is 1, G0 is 0 or Z). Specifically, the magnification can be configured by changing the voltage of G0 and G1 by changing the resistance of resistors R25, R26, R17, and R27 and connecting them to the power ground. The chip can operate within the range of -40 degrees to 105 degrees.

[0089] The ninth capacitor C26 is 100 nanofarads; the tenth capacitor C27 is 4.7 microfarads; the eleventh capacitor C24 is 10 nanofarads; the twelfth capacitor C30 is 1 microfarad; the thirteenth capacitor C31 is 10 nanofarads; the fourteenth capacitor C32 is 4.7 microfarads; the fifteenth capacitor C28 is 100 nanofarads; the sixteenth capacitor C33 is 100 picofarads; the seventeenth capacitor C43 is 10 nanofarads;

[0090] The above-mentioned first resistor R15 is 100 ohms; the second resistor R16 is 100 ohms; the third resistor R25 is 100 kiloohms; the fourth resistor R17 is 100 kiloohms; the fifth resistor R26 is 100 kiloohms; the sixth resistor R33 is 100 ohms; the seventh resistor R27 is 100 kiloohms; the eighth resistor R34 is 100 ohms; and the ninth resistor R28 is 100 ohms.

[0091] The function of each capacitor is to filter out clutter, and the function of the first resistor R15 and the second resistor R16 is to filter out common-mode clutter, thereby ensuring the accuracy of the analog-to-digital conversion result and thus improving the accuracy of the torque measurement result. The function of the sixth resistor R33 and the eighth resistor R34 is to limit current.

[0092] 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.

[0093] 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 is an electrical signal transmission method, which is more efficient than the mechanical method, thereby improving the efficiency of torque measurement. In addition, the process of leading out the voltage signal will not cause any signal fluctuations, thereby improving the accuracy of the torque measurement results. The analog-to-digital converter ISL28533 has a high calculation rate. 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 efficiency of torque measurement. 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.

[0094] 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 measuring 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.

[0095] Figure 6 (a) and Figure 6 (b) are schematic diagrams of an actual installation effect of each device in the flywheel series torque measurement equipment. 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.

[0096] 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.

[0097] In one implementation, Figure 7 As shown, the first voltage conversion module includes:

[0098] A first voltage input terminal connected to an eighteenth capacitor C39, a nineteenth capacitor C40, one end of a tenth resistor R29, and a pin 3 of the converter, namely a VIN (voltage input) pin;

[0099] The other ends of the eighteenth capacitor C39 and the nineteenth capacitor C40 are both grounded; the other end of the tenth resistor R29 is connected to one end of the eleventh 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 eleventh resistor R2 is grounded;

[0100] The first voltage output terminal is connected to the pin 6 of the converter, namely the VOUT (Voltage Output) pin, the twelfth resistor R30, the twentieth capacitor C41, and one end of the twenty-first capacitor C42;

[0101] The other ends of the twentieth capacitor C41 and the twenty-first capacitor C42 are both grounded; the other end of the twelfth resistor R30 is connected to the pin 7 of the converter, i.e., the FB (Feedback) pin, and one end of the thirteenth resistor R31; the other end of the thirteenth resistor R31 is grounded;

[0102] Pin 1 of the converter, ie, the GND (Ground) pin, and pin 11, ie, the PAD (Thermal Pad) pin, are grounded.

[0103] 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.

[0104] Among them, the eighteenth capacitor C39 is 10 microfarads; the nineteenth capacitor C40 is 100 nanofarads; the twentieth capacitor C41 is 22 microfarads; and the twenty-first capacitor C42 is 100 nanofarads.

[0105] The 18th capacitor C39, the 19th capacitor C40, the 20th capacitor C41, and the 21st 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 ability, and the larger the capacitance, the stronger the low-frequency filtering ability. The 18th capacitor C39 and the 20th capacitor C41 also have the function of energy storage.

[0106] The tenth resistor R29 is 220 kilo-ohms; the eleventh resistor R2 is 143 kilo-ohms; the twelfth resistor R30 is 33 kilo-ohms; and the thirteenth resistor R31 is 8.06 kilo-ohms.

[0107] The FB pin voltage is 1 V, so the 12th resistor R30 and the 13th 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.

[0108] In one implementation, Figure 8 As shown, the second voltage conversion module includes:

[0109] A second voltage input terminal is connected to a twenty-second capacitor C16, a twenty-third capacitor C17, one end of a fourteenth resistor R9, and a pin 10 of the voltage regulator, namely a VIN (Input, voltage input) pin, a pin 9, namely a VIN pin, and a pin 6, namely a SS_CTRL (soft start control) pin;

[0110] The other ends of the twenty-second capacitor C16 and the twenty-third capacitor C17 are grounded; the other end of the fourteenth resistor R9 is connected to the pin 7 of the voltage regulator, i.e., the EN (enable) pin;

[0111] Pin 8 of the voltage regulator, i.e., the NR / SS (noise reduction) pin, is connected to one end of the twenty-fourth capacitor C18; the other end of the twenty-fourth capacitor C18 is grounded;

[0112] Pin 1 and pin 2 of the voltage regulator, i.e., OUT (output) pins, are connected to one end of the fifteenth resistor R11, the twenty-fifth capacitor C19, the twenty-sixth capacitor C20, the twenty-seventh capacitor C21, the sixteenth resistor R12, and the seventeenth resistor R13;

[0113] The other end of the fifteenth resistor R11 is connected to the other end of the twenty-fifth capacitor C19, the pin 3 of the voltage regulator, i.e., the FB (FeedBack) pin, and one end of the eighteenth resistor R10; the other ends of the eighteenth resistor R10, the twenty-sixth capacitor C20, and the twenty-seventh capacitor C21 are all grounded; the other end of the sixteenth resistor R12 is connected to the pin 5 of the voltage regulator, i.e., the PG (power-good) pin; the other end of the seventeenth resistor R13 is connected to one end of the twenty-eighth capacitor C22 and the second voltage output terminal; the other end of the twenty-eighth capacitor C22 is grounded;

[0114] Pin 4 of the voltage regulator, ie, the GND (Ground) pin, is grounded.

[0115] 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.

[0116] 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.

[0117] The above-mentioned twenty-second capacitor C16 is 10 microfarads; the twenty-third capacitor C17 is 100 nanofarads; the twenty-fourth capacitor C18 is 100 nanofarads; the twenty-fifth capacitor C19 is 10 nanofarads; the twenty-sixth capacitor C20 is 10 microfarads; the twenty-seventh capacitor C21 is 100 nanofarads; and the twenty-eighth capacitor C22 is 100 nanofarads.

[0118] The function of the 22nd capacitor C16, the 23rd capacitor C17, the 26th capacitor C20, and the 28th capacitor C22 is filtering to obtain a more accurate and stable voltage. The smaller the capacitance, the stronger the high-frequency filtering ability, and the larger the capacitance, the stronger the low-frequency filtering ability. The 22nd capacitor C16 and the 26th capacitor C20 also have the function of energy storage. The function of the 25th capacitor C19 is to clip the wave.

[0119] The fourteenth resistor R9 is 100 kilo-ohms; the fifteenth resistor R11 is 10.5 kilo-ohms; the sixteenth resistor R12 is 20 kilo-ohms; the seventeenth resistor R13 is 1-2 ohms; and the eighteenth resistor R10 is 2 kilo-ohms.

[0120] In one implementation, Fig. 9 As shown, the third voltage conversion module includes:

[0121] A third voltage input terminal is connected to the twenty-ninth capacitor C35, the thirtieth capacitor C36, one end of the nineteenth resistor R029, and the pin 3 of the switching regulator, namely the VIN (Voltage Input) pin;

[0122] The other ends of the 29th capacitor C35 and the 30th capacitor C36 are both grounded; the other end of the 19th resistor R029 is connected to the pin 6 of the switching regulator, i.e., the EN (enable) pin;

[0123] Pin 5 of the switching regulator, namely the VSEL / MODE pin, is connected to one end of the twentieth resistor R32; the other end of the twentieth resistor R32 is grounded;

[0124] The third voltage output terminal is connected to the first inductor L1, the thirty-first capacitor C37, one end of the thirty-second 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-first capacitor C37 and the thirty-second capacitor C38 are both grounded;

[0125] Pin 1 of the switching regulator, ie, the GND (Ground) pin, is grounded.

[0126] 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.

[0127] The 29th capacitor C35 is 4.7 microfarads; the 30th capacitor C36 is 100 nanofarads; the 31st capacitor C37 is 10 microfarads; the 32nd capacitor C38 is 100 nanofarads. The 19th resistor R029 is 100 kilo-ohms; the 20th resistor R32 is 249 kilo-ohms. The first inductor L1 is 470 nanohenry.

[0128] The function of the nineteenth 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.

[0129] The twenty-ninth capacitor C35, the thirtieth capacitor C36, the thirty-first capacitor C37, and the thirty-second capacitor C38 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; the larger the capacitance, the stronger the low-frequency filtering capability. The twenty-ninth capacitor C35 and the thirty-first capacitor C37 also have the function of energy storage.

[0130] The voltage conversion module can be used to convert a voltage value suitable for each device in the torque measuring device to ensure the normal operation of the torque measuring device.

[0131] In one implementation, Fig.10 As shown, the wireless data transmitting device 150 includes:

[0132] 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 twenty-first resistor R20;

[0133] The other end of the twenty-first resistor R20 is connected to one end of the twenty-second resistor R19 and the pin 3 of the data transmission chip, namely the EN (enable) pin;

[0134] The other end of the twenty-second resistor R19 is connected to the pin 1 of the data transmission chip, namely the RST (RESET) pin;

[0135] A twenty-third 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 twenty-fourth resistor R22 and the third voltage output terminal, and the other end of the twenty-fourth resistor R22 is connected to the pin 11 of the data transmission chip, that is, the second input pin (IO2);

[0136] A twenty-fifth 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, the GND (Ground) pin, and is grounded;

[0137] 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;

[0138] The resistances of the twenty-first resistor R20 , the twenty-third resistor R21 , the twenty-fourth resistor R22 , and the twenty-fifth resistor R23 are all 1 megohm.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] In one implementation, Fig.11 As shown, the power transmission module includes:

[0143] A DC input terminal is connected to the 33rd capacitor C29, the 34th capacitor C70, one end of the second inductor L5, and the pin 4 of the voltage regulator, namely the VIN (Voltage Input) pin, and the pin 2, namely the EN (enable) pin; the other ends of the 33rd capacitor C29 and the 34th capacitor C70 are grounded; and the ground pin of the voltage regulator is grounded;

[0144] The other end of the second inductor L5 is connected to the thirty-fifth capacitor C80, one end of the thirty-sixth capacitor C1, and pins 3 and 6 of the regulator, i.e., the SW (switch node) pin;

[0145] The other ends of the thirty-fifth capacitor C80 and the thirty-sixth 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 twenty-sixth resistor R6, the thirty-seventh capacitor C51, the thirty-eighth capacitor C91, one end of the thirty-ninth capacitor C92, and the second pin of the DC-AC converter module;

[0146] The other ends of the thirty-seventh capacitor C51, the thirty-eighth capacitor C91, and the thirty-ninth capacitor C92 are all grounded; the other end of the twenty-sixth resistor R6 is connected to the twenty-seventh resistor R60, one end of the twenty-eighth resistor R50, and the pin 5 of the regulator, i.e., the FB (FeedBack) pin; the other end of the twenty-seventh resistor R60 is grounded; the other end of the twenty-eighth resistor R50 is connected to the third pin of the transistor Q2; the second pin of the transistor Q2 is grounded;

[0147] 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.

[0148] 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.

[0149] The above-mentioned thirty-third capacitor C29 is 220 microfarads; the thirty-fourth capacitor C70 is 1 microfarad; the thirty-fifth capacitor C80 is 10 microfarads; the thirty-sixth capacitor C1 is 22 microfarads; the thirty-seventh capacitor C51 is 100 microfarads; the thirty-eighth capacitor C91 is 100 microfarads; the thirty-ninth capacitor C92 is 1 microfarad; the twenty-sixth resistor R6 is 7.15 kilohms; the twenty-seventh resistor R60 is 1 kilohm; and the twenty-eighth resistor R50 is 4.99 kilohms.

[0150] The third inductor L4, the second inductor L5, and the thirty-sixth capacitor C1 are used to store energy. The twenty-sixth resistor R6, the twenty-seventh resistor R60, the twenty-eighth resistor R50, and the transistor Q2 are used to adjust the amplitude of the voltage output.

[0151] 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.

[0152] 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 ninth capacitor (C26), a tenth capacitor (C27) connected to the second voltage output end of the second voltage conversion module, and a positive pin of a feedback signal connected to a strain sensor interface (P2); the other ends of the ninth capacitor (C26) and the tenth capacitor (C27) are both grounded; the positive power supply pin connected to the strain sensor interface (P2) is grounded; the negative pin of the feedback signal connected to the strain sensor interface (P2) is connected to one end of a first resistor (R15); the other end of the first resistor (R15) is connected to an eleventh capacitor (C24), one end of a twelfth capacitor (C30), and a positive differential input of an analog-to-digital converter ISL28533 The eleventh capacitor (C24) is connected to the pin; the other end of the twelfth capacitor (C30) is connected to the second resistor (R16), one end of the thirteenth capacitor (C31), and the negative differential input pin of the analog-to-digital converter; the other end of the second resistor (R16) is connected to the negative power supply of the strain sensor interface (P2); the other end of the thirteenth capacitor (C31) is grounded; the negative voltage input ground pin of the analog-to-digital converter is grounded; the fourteenth capacitor (C32), the fifteenth capacitor (C28), the third resistor (R25), one end of the fourth resistor (R17) connected to the third voltage input terminal, and the positive voltage input pin of the analog-to-digital converter are connected to the ground. The fourteenth capacitor (C32) and the fifteenth capacitor (C28) have their other ends connected to ground; the third resistor (R25) has its other end connected to one end of the fifth resistor (R26) and the sixth resistor (R33); the fourth resistor (R17) has its other end connected to one end of the seventh resistor (R27) and the eighth resistor (R34); the fifth resistor (R26) and the seventh resistor (R27) have their other ends connected to ground; the sixth resistor (R33) has its other end connected to the first gain control logic input pin of the analog-to-digital converter; the eighth resistor (R34) has its other end connected to the second gain control logic input pin of the analog-to-digital converter; the analog-to-digital converter The non-inverting operational amplifier input pin, the auxiliary amplifier output pin, and the output reference pin are all connected to one end of the sixteenth capacitor (C33), and the other end of the sixteenth capacitor (C33) is grounded; the single-ended output pin of the analog-to-digital converter is connected to one end of the ninth resistor (R28); the other end of the ninth resistor (R28) is connected to one end of the seventeenth capacitor (C43), and the other end of the seventeenth capacitor (C43) is grounded; the single-ended output pin of the analog-to-digital converter is connected to the single-chip microcomputer 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 an eighteenth capacitor (C39), a nineteenth capacitor (C40), one end of a tenth resistor (R29), and a voltage input pin of the converter; The other ends of the eighteenth capacitor (C39) and the nineteenth capacitor (C40) are both grounded; the other end of the tenth resistor (R29) is connected to one end of the eleventh resistor (R2) and the enable pin of the converter; the mode / synchronization pin of the converter is grounded; the other end of the eleventh resistor (R2) is grounded; The first voltage output terminal is connected to the voltage output pin of the converter, a twelfth resistor (R30), a twentieth capacitor (C41), and one end of a twenty-first capacitor (C42); The other ends of the 20th capacitor (C41) and the 21st capacitor (C42) are both grounded; the other end of the 12th resistor (R30) is connected to the feedback pin of the converter and one end of the 13th resistor (R31); the other end of the 13th 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 eighteenth capacitor (C39) is 10 microfarads; the nineteenth capacitor (C40) is 100 nanofarads; the twentieth capacitor (C41) is 22 microfarads; the twenty-first capacitor (C42) is 100 nanofarads; The tenth resistor (R29) is 220 kilo-ohms; the eleventh resistor (R2) is 143 kilo-ohms; the twelfth resistor (R30) is 33 kilo-ohms; and the thirteenth 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 a twenty-second capacitor (C16), a twenty-third capacitor (C17), one end of a fourteenth resistor (R9), a first voltage input pin, a second voltage input pin, and a soft start control pin of the voltage regulator; The other ends of the 22nd capacitor (C16) and the 23rd capacitor (C17) are grounded; the other end of the 14th 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-fourth capacitor (C18); the other end of the twenty-fourth capacitor (C18) is grounded; The first output pin and the second output pin of the voltage regulator are connected to the fifteenth resistor (R11), the twenty-fifth capacitor (C19), the twenty-sixth capacitor (C20), the twenty-seventh capacitor (C21), the sixteenth resistor (R12), and one end of the seventeenth resistor (R13); The other end of the fifteenth resistor (R11) is connected to the other end of the twenty-fifth capacitor (C19), the feedback pin of the voltage regulator, and one end of the eighteenth resistor (R10); the other ends of the eighteenth resistor (R10), the twenty-sixth capacitor (C20), and the twenty-seventh capacitor (C21) are all grounded; the other end of the sixteenth resistor (R12) is connected to the power good indicator pin of the voltage regulator; the other end of the seventeenth resistor (R13) is connected to one end of the twenty-eighth capacitor (C22) and the second voltage output terminal; the other end of the twenty-eighth 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 22nd capacitor (C16) is 10 microfarads; the 23rd capacitor (C17) is 100 nanofarads; the 24th capacitor (C18) is 100 nanofarads; the 25th capacitor (C19) is 10 nanofarads; the 26th capacitor (C20) is 10 microfarads; the 27th capacitor (C21) is 100 nanofarads; the 28th capacitor (C22) is 100 nanofarads; The fourteenth resistor (R9) is 100 kilo-ohms; the fifteenth resistor (R11) is 10.5 kilo-ohms; the sixteenth resistor (R12) is 20 kilo-ohms; the seventeenth resistor (R13) is 1-2 ohms; and the eighteenth 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 the twenty-ninth capacitor (C35), the thirtieth capacitor (C36), one end of the nineteenth resistor (R029), and the voltage input pin of the switching regulator; The other ends of the 29th capacitor (C35) and the 30th capacitor (C36) are both grounded; the other end of the 19th 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 the twentieth resistor (R32); the other end of the twentieth resistor (R32) is grounded; The third voltage output terminal is connected to the first inductor (L1), the thirty-first capacitor (C37), one end of the thirty-second 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-first capacitor (C37) and the thirty-second capacitor (C38) are both grounded; The ground pin of the switching regulator is grounded; The 29th capacitor (C35) is 4.7 microfarads; the 30th capacitor (C36) is 100 nanofarads; the 31st capacitor (C37) is 10 microfarads; the 32nd capacitor (C38) is 100 nanofarads; the 19th resistor (R029) is 100 kilo-ohms; the 20th resistor (R32) is 249 kilo-ohms; and the 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 twenty-first resistor (R20); The other end of the twenty-first resistor (R20) is connected to one end of the twenty-second resistor (R19) and the enable pin of the data transmission chip; The other end of the twenty-second resistor (R19) is connected to the reset pin of the data transmitting chip; a twenty-third 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 a twenty-fourth resistor (R22) and the third voltage output end, and the other end of the twenty-fourth resistor (R22) is connected to the second input pin of the data transmission chip; a twenty-fifth 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 21st resistor (R20), the 23rd resistor (R21), the 24th resistor (R22), and the 25th 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 100 nanofarads; the tenth capacitor (C27) is 4.7 microfarads; the eleventh capacitor (C24) is 10 nanofarads; the twelfth capacitor (C30) is 1 microfarad; the thirteenth capacitor (C31) is 10 nanofarads; the fourteenth capacitor (C32) is 4.7 microfarads; the fifteenth capacitor (C28) is 100 nanofarads; the sixteenth capacitor (C33) is 100 picofarads; and the seventeenth capacitor (C43) is 10 nanofarads; The first resistor (R15) is 100 ohms; the second resistor (R16) is 100 ohms; the third resistor (R25) is 100 kilo-ohms; the fourth resistor (R17) is 100 kilo-ohms; the fifth resistor (R26) is 100 kilo-ohms; the sixth resistor (R33) is 100 ohms; the seventh resistor (R27) is 100 kilo-ohms; the eighth resistor (R34) is 100 ohms; and the ninth resistor (R28) 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-third capacitor (C29), a thirty-fourth 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-third capacitor (C29) and the thirty-fourth 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-fifth capacitor (C80), one end of the thirty-sixth capacitor (C1), and the first switch node pin and the second switch node pin of the regulator; The other ends of the thirty-fifth capacitor (C80) and the thirty-sixth 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 twenty-sixth resistor (R6), the thirty-seventh capacitor (C51), the thirty-eighth capacitor (C91), one end of the thirty-ninth capacitor (C92), and the second pin of the DC-AC converter module; The other ends of the thirty-seventh capacitor (C51), the thirty-eighth capacitor (C91), and the thirty-ninth capacitor (C92) are all grounded; the other end of the twenty-sixth resistor (R6) is connected to the twenty-seventh resistor (R60), one end of the twenty-eighth resistor (R50), and the feedback pin of the voltage regulator; the other end of the twenty-seventh resistor (R60) is grounded; the other end of the twenty-eighth 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-third capacitor (C29) is 220 microfarads; the thirty-fourth capacitor (C70) is 1 microfarad; the thirty-fifth capacitor (C80) is 10 microfarads; the thirty-sixth capacitor (C1) is 22 microfarads; the thirty-seventh capacitor (C51) is 100 microfarads; the thirty-eighth capacitor (C91) is 100 microfarads; and the thirty-ninth capacitor (C92) is 1 microfarad; The 26th resistor (R6) is 7.15 kilo-ohms; the 27th resistor (R60) is 1 kilo-ohm; and the 28th resistor (R50) is 4.99 kilo-ohms.

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