CN110873618A

CN110873618A - Torque measuring equipment

Info

Publication number: CN110873618A
Application number: CN201911337065.4A
Authority: CN
Inventors: 龙小波; 桂凌云
Original assignee: Beijing Bailian Changtong Technology Co Ltd
Current assignee: Beijing Bailian Changtong Technology Co Ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-03-10

Abstract

The embodiment of the invention discloses torque measuring equipment. The apparatus comprises: the device 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; the wireless power supply device is connected with the voltage conversion device; the voltage conversion device includes: the device comprises a first voltage conversion module, a second voltage conversion module and a third voltage conversion module; the analog-to-digital conversion apparatus includes: the analog-to-digital converter AD7190 is connected with a second voltage output end of the second voltage conversion module, and is connected with a strain sensor interface; a serial data output/data ready output pin of the analog-to-digital converter is connected with the singlechip and used for sending the processed data to the singlechip; the strain sensor interface is connected and used for sending the voltage difference generated by the strain gauge to the analog-to-digital converter; and the singlechip is used for sending the data to the wireless data sending device. By applying the scheme provided by the embodiment of the invention, the accuracy of the torque measurement result can be improved.

Description

Torque measuring equipment

Technical Field

The invention relates to the technical field of torque measurement, in particular to torque measurement equipment.

Background

With the development of the domestic automobile industry, new models come to the fore, and automobile bench and road tests become more and more important. Modern engines need to increase the rotating speed to improve the mechanical performance and efficiency, and the torque is an important index of the performance of the motor and the engine, so that high-precision and high-reliability torque measurement is needed.

The existing torque measuring method mainly comprises a resistance strain gauge type transmission measuring method. The torque can cause a product to be detected to generate certain strain, and the strain and the torque have a proportional relation, so that the corresponding torque can be detected through the resistance strain gauge which can be subjected to torsional deformation. When a product to be tested is subjected to torque action, the maximum strain is generated in the direction forming an angle of 45 degrees with the axis, and therefore the resistance strain gauge is pasted in the direction, so that the torque applied to the transmission shaft can be detected.

In the known method, the output voltage signal of the measuring bridge is tapped off primarily via slip rings and brushes. The slip ring is generally made of copper, and the brushes are classified into carbon brushes and metal brushes. Because 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 electric brush is required to be very stable. In practical applications, the contact resistance between the slip ring and the brush is unreliable, which causes signal fluctuation, and thus results in inaccurate torque measurement results.

Disclosure of Invention

The invention provides a torque measuring device, which aims to improve the accuracy of a torque measuring result. The specific technical scheme is as follows.

A torque measurement device comprising: the device 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;

the wireless power supply device includes: the power transmission module is used for generating a first alternating voltage; the transmitting coil is connected with the power transmission transmitting module and used for receiving the first alternating voltage; a receiving coil arranged in parallel with the transmitting coil for generating a second alternating voltage; the input interface is connected with the receiving coil, is connected with a first pin of the rectifier bridge through a first voltage input pin, and is connected with a second pin of the rectifier bridge through a second voltage input pin; for sending the second alternating voltage to the rectifier bridge; the third pin of the rectifier bridge is connected with the anode of the first diode; the fourth pin of the rectifier bridge is connected with the negative electrode of the first diode; the cathode of the first diode is also connected with one end of a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor and an eighth capacitor; the anode of the first diode is grounded and is connected with 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 apparatus includes: the device comprises a first voltage conversion module, a second voltage conversion module and a third voltage conversion module; a first voltage input end of the first voltage conversion module is connected with a cathode of the first diode; a first voltage output end of the first voltage conversion module is connected with a second voltage input end of the second voltage conversion module and a third voltage input end of the third voltage conversion module;

the analog-to-digital conversion apparatus includes: a first voltage input pin, a ninth capacitor, a tenth capacitor, one end of an eleventh capacitor, a feedback signal positive pin connected with a strain sensor interface, and a positive reference input pin of the analog-to-digital converter AD7190, which are connected with a second voltage output end of the second voltage conversion module; the other ends of the ninth capacitor, the tenth capacitor and the eleventh capacitor are all grounded; a second voltage input pin of the analog-to-digital converter connected with a third voltage output end of the third voltage conversion module, a twelfth capacitor and one end of a thirteenth capacitor are connected; the other ends of the twelfth capacitor and the thirteenth capacitor are grounded; the power supply positive pin connected with the strain sensor interface is connected with one end of a fourteenth capacitor, one end of a first resistor, one end of a fifteenth capacitor, a negative reference input pin of the analog-to-digital converter and a ground pin for converting bridge low voltage; the fourteenth capacitor, the first resistor and the other end of the first resistor are grounded; the other end of the fifteenth capacitor is connected with one end of a sixteenth capacitor and a positive reference input pin of the analog-to-digital converter; the other end of the sixteenth capacitor is grounded; the negative electrode pin of the feedback signal connected with the interface of the strain sensor is connected with one end of a second resistor; the other end of the second resistor is connected with one end of a seventeenth capacitor, one end of an eighteenth capacitor and a 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 with the third resistor, one end of the nineteenth capacitor and a second analog input pin of the analog-to-digital converter; the other end of the third resistor is connected with a power supply negative pin of the interface of the strain sensor; 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 with the singlechip and used for sending the processed data to the singlechip; the strain sensor interface is used for sending the voltage difference generated by the strain gauge to the analog-to-digital converter;

and the singlechip is used for sending the data to the wireless data sending device.

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

the voltage of a first voltage output end of the first voltage conversion module is 5.1V;

the voltage of a second voltage output end of the second voltage conversion module is 5V;

and the voltage of a third voltage output end of the third voltage conversion module is 3.3V.

Optionally, the first voltage conversion module includes:

the first voltage input end is connected with the twentieth capacitor, the twenty-first capacitor, one end of the fourth resistor and a voltage input pin of the converter;

the other ends of the twentieth capacitor and the twenty-first capacitor are grounded; the other end of the fourth resistor is connected with one end of a fifth resistor and an enabling pin of the converter; the mode/sync pin of the converter is grounded; the other end of the fifth resistor is grounded;

the first voltage output end is connected with one end of a voltage output pin of the converter, one end of a sixth resistor, one end of a twenty-second capacitor and one end of a twenty-third capacitor;

the other ends of the twenty-second capacitor and the twenty-third capacitor are grounded; the other end of the sixth resistor is connected with a feedback pin of the converter and one end of a seventh resistor; the other end of the seventh resistor is grounded;

and the ground pin and the heat conducting pad pin of the converter are grounded.

Optionally, the twentieth capacitance is 10 microfarads; the twenty-first capacitance is 100 nanofarads; the twenty-second capacitance is 22 microfarads; the twenty-third capacitance is 100 nanofarads;

the fourth resistance is 220 kilo-ohms; the fifth resistance is 143 kilo-ohms; the sixth resistance is 33 kilo-ohms; the seventh resistance is 8.06 kilo-ohms.

Optionally, the second voltage conversion module includes:

the second voltage input end is connected with one end of a twenty-fourth capacitor, one end of a twenty-fifth capacitor, one end of an eighth resistor, a first voltage input pin, a second voltage input pin and a soft start control pin of the voltage stabilizer;

the other ends of the twenty-fourth capacitor and the twenty-fifth capacitor are grounded; the other end of the eighth resistor is connected with an enabling pin of the voltage stabilizer;

the noise reduction pin of the voltage stabilizer is connected with one end of a twenty-sixth capacitor; the other end of the twenty-sixth capacitor is grounded;

the first output pin and the second output pin of the voltage stabilizer are connected with one end of a ninth resistor, a twenty-seventh capacitor, a twenty-eighth capacitor, a twenty-ninth capacitor, a tenth resistor and an eleventh resistor;

the other end of the ninth resistor is connected with the other end of the twenty-seventh capacitor, a feedback pin of the voltage stabilizer 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 with a power good indicator pin of the voltage stabilizer; the other end of the eleventh resistor is connected with one end of a thirtieth capacitor and the second voltage output end; the other end of the thirtieth capacitor is grounded;

and the ground pin of the voltage stabilizer is grounded.

Optionally, the twenty-fourth capacitance is 10 microfarads; the twenty-fifth capacitance is 100 nanofarads; the twenty-sixth capacitance 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;

the eighth resistance is 100 kilo-ohms; the ninth resistance is 10.5 kilo-ohms; the tenth resistance is 20 kilo-ohms; the eleventh resistance is 1-2 ohms; the twelfth resistance is 2 kilo-ohms.

Optionally, the third voltage conversion module includes:

the third voltage input end is connected with the thirty-first capacitor, the thirty-second capacitor, one end of the thirteenth resistor and a voltage input pin of the switching regulator;

the other ends of the thirty-first capacitor and the thirty-second capacitor are grounded; the other end of the thirteenth resistor is connected with an enabling pin of the switching regulator;

a voltage selection pin of the switching regulator is connected with one end of a fourteenth resistor; the other end of the fourteenth resistor is grounded;

the third voltage output end is connected with one end of the first inductor, one end of the thirty-third capacitor, one end of the thirty-fourth capacitor and a detection pin of the switching regulator; the other end of the first inductor is connected with a switch pin of the switching regulator; the other ends of the thirty-third capacitor and the thirty-fourth capacitor are grounded;

the ground pin of the switching regulator is grounded;

the thirty-first capacitance is 4.7 microfarads; the thirty-second capacitance is 100 nanofarads; the thirty-third capacitance is 10 microfarads; the thirty-fourth capacitance is 100 nanofarads; the thirteenth resistance is 100 kilo-ohms; the fourteenth resistance is 249 kilo-ohms; the first inductance is 470 nanohenries.

Optionally, the wireless data transmitting apparatus includes:

a chip power supply voltage pin of the data sending chip connected with the third voltage output end and one end of a fifteenth resistor;

the other end of the fifteenth resistor is connected with one end of a sixteenth resistor and an enabling pin of the data sending chip;

the other end of the sixteenth resistor is connected with a reset pin of the data sending chip;

a seventeenth resistor, one end of which is connected to the first input pin of the data sending chip, the other end of which is connected to one end of an eighteenth resistor and the third voltage output terminal, and the other end of which is connected to the second input pin of the data sending chip;

one end of the nineteenth resistor is connected with the third input pin of the data sending chip, and the other end of the nineteenth resistor is connected with the ground pin of the data sending chip and grounded;

the data receiving pin and the data sending pin of the data sending chip are both connected with the single chip microcomputer and used for receiving data sent by the single chip microcomputer;

and the fifteenth resistor, the seventeenth resistor, the eighteenth resistor and the nineteenth resistor are all 1 megaohm.

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 capacitance is 100 nanofarads; the eleventh capacitance is 100 nanofarads; the twelfth capacitance is 4.7 microfarads; the thirteenth capacitor is 100 nanofarads; the fourteenth capacitance is 10 nanofarads; the fifteenth capacitance is 1 microfarad; the sixteenth capacitor is 10 nanofarads; the seventeenth capacitor is 10 nanofarads; the eighteenth capacitor is 1 microfarad; the nineteenth capacitor is 10 nanofarads;

the second resistance is 100 ohms; the third resistance is 100 ohms.

Optionally, the power transmission module includes:

the direct current input end is connected with the thirty-fifth capacitor, the thirty-sixth capacitor, one end of the second inductor, and a voltage input pin and an enabling pin of the voltage stabilizer; the other ends of the thirty-fifth capacitor and the thirty-sixth capacitor are grounded; the ground pin of the voltage stabilizer is grounded;

the other end of the second inductor is connected with one end of a thirty-seventh capacitor, one end of a thirty-eighth capacitor, and a first switch node pin and a second switch node pin of the voltage stabilizer;

the other end of each of the thirty-seventh capacitor and the thirty-eighth capacitor is connected with 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 with one end of a twentieth resistor, one end of a thirty-ninth capacitor, one end of a forty-first capacitor and a second pin of the direct current-to-alternating current module;

the other ends of the thirty-ninth capacitor, the forty-first capacitor and the forty-first capacitor are grounded; the other end of the twentieth resistor is connected with the twenty-first resistor, one end of the twenty-second resistor and a feedback pin of the voltage stabilizer; the other end of the twenty-first resistor is grounded; the other end of the twenty-second resistor is connected with a third pin of the transistor; the second pin of the transistor is grounded;

a first pin of the direct current-to-alternating current module is grounded; the third pin and the fourth pin of the direct current-to-alternating current module are both connected with the sending coil;

the thirty-fifth capacitor is 220 microfarads; the thirty-sixth capacitor is 1 microfarad; the thirty-seventh capacitor is 10 microfarads; the thirty-eighth capacitance is 22 microfarads; the thirty-ninth capacitor is 100 microfarads; the forty th capacitor is 100 microfarads; the forty-first capacitor is 1 microfarad; the twentieth resistance is 7.15 kilo-ohms; the twenty-first resistance is 1 kilo-ohm; the twenty-second resistance is 4.99 kilo-ohms.

As can be seen from the above, the torque measuring apparatus provided by the embodiment of the present invention includes: the device 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; the wireless power supply device includes: the power transmission module is used for generating a first alternating voltage; the transmitting coil is connected with the power transmission transmitting module and used for receiving the first alternating voltage; a receiving coil arranged in parallel with the transmitting coil for generating a second alternating voltage; the input interface is connected with the receiving coil, is connected with a first pin of the rectifier bridge through a first voltage input pin, and is connected with a second pin of the rectifier bridge through a second voltage input pin; for sending the second alternating voltage to the rectifier bridge; the third pin of the rectifier bridge is connected with the anode of the first diode; the fourth pin of the rectifier bridge is connected with the negative electrode of the first diode; the cathode of the first diode is also connected with one end of a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor and an eighth capacitor; the anode of the first diode is grounded and is connected with 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: the device comprises a first voltage conversion module, a second voltage conversion module and a third voltage conversion module; a first voltage input end of the first voltage conversion module is connected with a cathode of the diode; a first voltage output end of the first voltage conversion module is connected with a second voltage input end of the second voltage conversion module and a third voltage input end of the third voltage conversion module; the analog-to-digital conversion apparatus includes: the first voltage input pin, the ninth capacitor, the tenth capacitor and one end of the eleventh capacitor of the analog-to-digital converter AD7190 are connected with the second voltage output end of the second voltage conversion module, the positive pin of a feedback signal of the strain sensor interface is connected with the 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; a second voltage input pin of the analog-to-digital converter connected with a third voltage output end of the third voltage conversion module, a twelfth capacitor and one end of a thirteenth capacitor are connected; the other ends of the twelfth capacitor and the thirteenth capacitor are grounded; the power supply positive pin of the strain sensor interface is connected with the fourteenth capacitor, one end of the first resistor, one end of the fifteenth capacitor, the negative reference input pin of the analog-to-digital converter and the ground pin for converting the bridge low voltage into the ground pin; the other ends of the fourteenth capacitor and the first resistor are grounded; the other end of the fifteenth capacitor is connected with one end of the sixteenth capacitor and a positive reference input pin of the analog-to-digital converter; a sixteenth capacitor, the other end of which is grounded; a negative electrode pin of a feedback signal of the strain sensor interface is connected with one end of the second resistor; the other end of the second resistor is connected with the seventeenth capacitor, one end of the eighteenth capacitor and a first analog input pin of the analog-to-digital converter; a seventeenth capacitor, the other end of which is grounded; the other end of the eighteenth capacitor is connected with the third resistor, one end of the nineteenth capacitor and a second analog input pin of the analog-to-digital converter; the other end of the third resistor is connected with a power supply negative pin connected with the interface of the strain sensor; a nineteenth capacitor, the other end of which is grounded; the serial data output/data ready output pin of the analog-to-digital converter is connected with the singlechip and used for sending the processed data to the singlechip; the strain sensor interface is connected and used for sending the voltage difference generated by the strain gauge to the analog-to-digital converter; the single chip microcomputer is used for sending data to the wireless data sending device, so that a voltage signal generated by the strain gauge can be directly led out through the strain sensor interface, and the process of leading out the voltage signal cannot cause any signal fluctuation, so that the accuracy of a torque measuring result can be improved. Moreover, the analog-to-digital converter AD7190 has high calculation precision, and the voltage signal generated by the strain gauge is converted into a digital signal through the analog-to-digital converter for output, so that the accuracy of the finally obtained torque measurement result can be further improved. Compared with the known wired power supply mode, the wireless power supply device can reduce signal fluctuation, thereby improving the accuracy of a torque measurement result. The wireless data transmission device can realize wireless data transmission, and compared with the known mode of carrying out wired data transmission through the conductive slip ring, the wireless data transmission device can reduce signal fluctuation caused by frictional contact of the slip ring, thereby improving the accuracy of a torque measurement result. Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.

The innovation points of the embodiment of the invention comprise:

1. by connecting with the strain sensor interface, the voltage signal generated by the strain gauge is directly led out, and the process of leading out the voltage signal cannot cause any signal fluctuation, so that the accuracy of the torque measurement result can be improved. Moreover, the analog-to-digital converter AD7190 has high calculation precision, and the voltage signal generated by the strain gauge is converted into a digital signal through the analog-to-digital converter for output, so that the accuracy of the finally obtained torque measurement result can be further improved. Compared with the known wired power supply mode, the wireless power supply device can reduce signal fluctuation, thereby improving the accuracy of a torque measurement result. The wireless data transmission device can realize wireless data transmission, and compared with the known mode of carrying out wired data transmission through the conductive slip ring, the wireless data transmission device can reduce signal fluctuation caused by frictional contact of the slip ring, thereby improving the accuracy of a torque measurement result.

2. The voltage value suitable for the working of each device in the torque measuring equipment can be obtained through conversion by the voltage conversion module, and the normal working of the torque measuring equipment is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is to be understood that the drawings in the following description are merely exemplary of some embodiments of the invention. For a person skilled in the art, without inventive effort, further figures can be obtained from these figures.

FIG. 1 is a schematic diagram of a torque measuring device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a wireless power supply device according to an embodiment of the invention;

fig. 3 is a schematic structural diagram of an analog-to-digital conversion apparatus according to an embodiment of the present invention;

FIG. 4 is a schematic view of an installation appearance of devices in the shaft-type torque measuring apparatus;

FIG. 5 is a schematic diagram of an actual installation effect of devices in the shaft-type torque measuring apparatus;

FIGS. 6(a) and 6(b) are schematic diagrams showing the effect of actual installation of the devices in the flywheel-based torque measuring apparatus;

fig. 7 is a schematic structural diagram of a voltage conversion module according to an embodiment of the invention;

fig. 8 is a schematic structural diagram of another voltage conversion module according to an embodiment of the present invention;

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

fig. 10 is a schematic structural diagram of a wireless data transmission device according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a power transmission module according to an embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

It is to be noted that the terms "comprises" and "comprising" and any variations thereof in the embodiments and drawings of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The embodiment of the invention discloses torque measuring equipment which can improve the accuracy of a torque measuring result.

In the embodiment of the invention, the torque borne by the transmission shaft can be measured by sticking the resistance strain gauge on 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 can be supplied in a wireless mode, and the voltage signal generated by the strain gauge is directly led out by connecting with a strain sensor interface. The following provides a detailed description of embodiments of the invention.

Fig. 1 is a schematic structural diagram of a torque measuring apparatus according to an embodiment of the present invention. The torque measuring apparatus may include: the wireless power supply device 110, the voltage conversion device 120, the analog-to-digital conversion device 130, the single chip microcomputer 140 and the wireless data transmission device 150.

The wireless power supply 110 may wirelessly supply power to the torque measuring device. After the wireless power supply device 110 supplies power, since the voltage values required by the devices in the torque measuring apparatus 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, transmit the digital signal to the wireless data transmitting device 150 through the single chip microcomputer 140, and transmit the digital signal to the signal receiving end through the wireless data transmitting device 150.

Specifically, as shown in fig. 2, the wireless power supply device 110 may include: the power transmission module is used for generating a first alternating voltage; the transmitting coil is connected with the power transmission transmitting module and used for receiving the first alternating voltage; a receiving coil arranged in parallel with the transmitting coil for generating a second alternating voltage; the input interface P3 connected with the receiving coil is connected with a first pin of the rectifier bridge D2 through a first voltage input pin and is connected with a second pin of the rectifier bridge D2 through a second voltage input pin; for sending the second alternating voltage to rectifier bridge D2; a third pin of the rectifier bridge D2 is connected to the anode of the first diode D4; a fourth pin of the rectifier bridge D2 is connected with the negative electrode of the first diode D4; the cathode of the first diode D4 is further connected with one end of a first capacitor C8, a second capacitor C9, a third capacitor C10, a fourth capacitor C11, a fifth capacitor C12, a sixth capacitor C13, a seventh capacitor C14 and an eighth capacitor C15; the positive electrode of the first diode D4 is grounded, and is 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 power transmission transmitting module converts direct current into alternating current to supply power to the transmitting coil, and the receiving coil can generate alternating current according to an electromagnetic theory. The alternating voltage generated by the receiving coil is changed into 35V direct voltage through the rectifier bridge, the first diode and each capacitor, and then the power supply can be supplied to the torque measuring equipment. The power supply device belongs to a wireless power supply device because the transmitting coil and the receiving coil are in wireless connection.

The first diode D4, i.e., the tvs SMAJ33A, has an operating peak reverse voltage of 33V, a breakdown voltage of 36.7V or less, and a breakdown voltage of 40.6V or less. The capacitors are used for filtering and also can play a role in storing energy. D2 functions as a rectifier bridge and converts alternating current to direct current. D4 is a transient suppressor diode that clamps the voltage at 33V and also enables the protection device.

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 voltage conversion apparatus 120 may include: the device comprises a first voltage conversion module, a second voltage conversion module and a third voltage conversion module; a first voltage input end of the first voltage conversion module is connected with the cathode of a first diode D4; the first voltage output end of the first voltage conversion module is connected with the second voltage input end of the second voltage conversion module and the third voltage input end of the third voltage conversion module.

That is to say, the first voltage conversion module is connected to the wireless power supply device 110, the voltage generated by the wireless power supply module 110 is obtained, and different voltage values are obtained through conversion by the first voltage conversion module, the second voltage conversion module and the third voltage conversion module.

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

In the embodiment of the 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 as an amplifier, and the amplifier amplifies the signal and then sends the amplified signal to the single chip microcomputer 140. The single chip microcomputer 140 can send commands to G1 and G0 ports of the amplifier through the SPI to control the amplification factor of the amplifier.

The AD7190 is a low-noise amplifier capable of completely simulating the front end, and is suitable for high-end precision measurement application. The AD7190 also had a zero delay function, which output data at a rate in the range of 4.7Hz to 4.8 kHz. The chip can operate in the range of-40 degrees to 105 degrees.

When pin AIN3 is used with pin AIN4, pin AIN3 may be configured as the positive input and pin AIN4 may be configured as the negative input of a fully differential input pair.

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; a seventeenth capacitor C24 of 10 nanofarads; the eighteenth capacitor C30 is 1 microfarad; the nineteenth capacitor C31 is 10 nanofarads; the second resistor R15 is 100 ohms; the third resistor R16 is 100 ohms.

The capacitors in the analog-to-digital conversion device 130 are used for filtering noise waves, and the second resistor R15 and the third resistor R16 are used for filtering common-mode noise waves, so that the accuracy of an analog-to-digital conversion result is ensured, and the accuracy of a torque measurement result is further improved.

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

As can be seen from the above, the torque measuring device provided by the embodiment of the present invention can directly extract the voltage signal generated by the strain gauge through the connection with the strain sensor interface, and the process of extracting the voltage signal does not cause any signal fluctuation, so that the accuracy of the torque measuring result can be improved. Moreover, the analog-to-digital converter AD7190 has high calculation precision, and the voltage signal generated by the strain gauge is converted into a digital signal through the analog-to-digital converter for output, so that the accuracy of the finally obtained torque measurement result can be further improved. Compared with the known wired power supply mode, the wireless power supply device can reduce signal fluctuation, thereby improving the accuracy of a torque measurement result. The wireless data transmission device can realize wireless data transmission, and compared with the known mode of carrying out wired data transmission through the conductive slip ring, the wireless data transmission device can reduce signal fluctuation caused by frictional contact of the slip ring, thereby improving the accuracy of a torque measurement result.

In a specific embodiment, as shown in fig. 4, a schematic view of an installation appearance of each device in the shaft-type torque measuring device is shown. Correspondingly, fig. 5 is a schematic diagram of an actual installation effect of each device in the shaft-type torque measuring apparatus. The installation positions of the acquisition board are the installation positions of the voltage conversion device, the single chip microcomputer and the wireless data sending device in the embodiment of the invention.

Fig. 6(a) and 6(b) are schematic diagrams showing an effect of actually mounting each device in the flywheel-series torque measuring apparatus. The installation positions of the acquisition board are the installation positions of the voltage conversion device, the single chip microcomputer and the wireless data sending device in the embodiment of the invention.

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

In one implementation, as shown in fig. 7, the first voltage conversion module includes:

a first Voltage Input end, which is connected to one end of the twentieth capacitor C39, one end of the twenty-first capacitor C40, one end of the fourth resistor R29, and a pin 3 of the converter, i.e., a VIN (Voltage Input) pin;

the other ends of the twentieth capacitor C39 and the twenty-first capacitor C40 are grounded; a fourth resistor R29, the other end of which is connected to one end of the fifth resistor R2 and pin 4 of the converter, i.e., the EN (enable) pin; pin 2 of the converter, i.e., the MODE/SYNC pin, is grounded; the other end of the fifth resistor R2 is grounded;

the first Voltage Output end is connected with one end of a pin 6 of the converter, namely a VOUT (Voltage Output) pin, a sixth resistor R30, a twenty-second capacitor C41 and a twenty-third capacitor C42;

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

pin 1 of the converter, i.e. the GND (Ground) pin, and pin 11, i.e. the PAD (Thermal PAD) pin, are grounded.

The transducer may be an LMZM23601 SILR. The 35V voltage is converted to a voltage of 5.1V by a non-isolated DC/DC converter LMZM23601 SILR. The chip LMZM23601SILR has a wide working input voltage of 1.4V to 36V, and an adjustable output voltage of 2.5V to 15V.

Wherein the twentieth capacitor C39 is 10 microfarads; the twenty-first capacitor C40 is 100 nanofarads; the twenty-second capacitor C41 is 22 microfarads; the twenty-third capacitance C42 is 100 nanofarads.

The twentieth capacitor C39, the twenty-first capacitor C40, the twenty-second capacitor C41 and the twenty-third capacitor C42 all have filtering functions, and more accurate and stable voltage is obtained. The smaller the capacitance, the stronger the high-frequency filtering capability, and the larger the capacitance, the stronger the low-frequency filtering capability. Wherein the twentieth capacitor C39 and the twenty-second capacitor C41 also have the function of energy storage.

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

The FB pin voltage is 1V, so that a voltage of 5.1V can be proportionally output by using two resistors, namely a sixth resistor R30 and a seventh resistor R31. The enabling voltage of the LMZM23601SILR chip is 1.8V, and the external voltage divider is added to set the input voltage of the voltage stabilizer for starting voltage conversion.

In one implementation, as shown in fig. 8, the second voltage conversion module includes:

a second voltage Input terminal, which is connected to one end of a twenty-fourth capacitor C16, a twenty-fifth capacitor C17, an eighth resistor R9, and a pin 10 of the voltage regulator, i.e., a VIN (Input) pin, a pin 9, i.e., a VIN pin, and a pin 6, i.e., an SS _ CTRL (soft start control) pin;

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

pin 8 of the voltage stabilizer, namely an NR/SS (noise reduction) pin, is connected with one end of a twenty-sixth capacitor C18; a twenty-sixth capacitor C18, the other end of which is grounded;

pin 1 and pin 2 of the voltage regulator, namely an OUT (output) pin, are connected with one ends of a ninth resistor R11, a twenty-seventh capacitor C19, a twenty-eighth capacitor C20, a twenty-ninth capacitor C21, a tenth resistor R12 and an eleventh resistor R13;

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

pin 4 of the regulator, i.e., the GND (Ground) pin, is grounded.

And the FB pin is used for setting the output voltage of the device. And the PG pin is used for opening the drain of the LDO output voltage. And the SS _ CTRL pin is connected to GND or IN to change the charging current of the NR/SS capacitor. And an NR/SS pin which is connected to an external capacitor to reduce noise generated by the internal band-gap reference. The external capacitance reduces the output noise to a very low level and sets the output slope to limit the inrush current.

The voltage regulator may be TPS7a9001 DSKR. The TPS7A9001DSKR chip is a low noise (4.7 μ VRMS), Low Dropout (LDO) regulator capable of providing 500mA current with maximum dropout of only 100mV to 5V and 200mV to 5.7V. Its output can be regulated by an external resistor of 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 an output voltage accuracy (over-line, load and temperature) of 1% and soft start functionality. It is well suited for analog low voltage devices that are power sensitive.

The 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; the thirtieth capacitor C22 is 100 nanofarads.

The twenty-fourth capacitor C16, the twenty-fifth capacitor C17, the twenty-eighth capacitor C20 and the thirty-third capacitor C22 are used for filtering, and more accurate and stable voltage is obtained. 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 sharpen the wave.

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

In one implementation, as shown in fig. 9, the third voltage conversion module includes:

a third Voltage Input end, which 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, i.e., a VIN (Voltage Input) pin;

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

pin 5 of the switching regulator, namely a VSEL/MODE pin, is connected with one end of a fourteenth resistor R32; the other end of the fourteenth resistor R32 is grounded;

the third voltage output end is connected with one end of a first inductor L1, one end of a thirty-third capacitor C37, one end of a thirty-fourth capacitor C38 and a pin 2 of the switching regulator, namely a VOS (voltage induced output) pin; the other end of the first inductor L1 is connected to pin 4 of the switching regulator, i.e., a SW (switch) pin; the other ends of the thirty-third capacitor C37 and the thirty-fourth capacitor C38 are grounded;

pin 1, i.e., the GND (Ground) pin, of the switching regulator is grounded.

The switching regulator may be TPS62802 YKAR. The 5.1V voltage is converted to 3.3V voltage by the switching regulator TPS62802 YKAR. The VOS pin is the output voltage detection pin of the internal feedback voltage divider network and the regulation loop.

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. A thirteenth resistor R029 of 100 kilo ohms; the fourteenth resistor R32 is 249 kilo-ohms. The first inductance L1 is 470 nanohenries.

The thirteenth resistor R029 is used for limiting current and ensuring that the chip is not burnt out. The first inductor L1 functions as an energy storage.

The thirty-first capacitor C35, the thirty-second capacitor C36, the thirty-third capacitor C37 and the thirty-fourth capacitor C38 all have filtering functions, and more accurate and stable voltage is obtained. The smaller the capacitance is, the stronger the high-frequency filtering capability is; the larger the capacitance, the stronger the low frequency filtering capability. The thirty-first capacitor C35 and the thirty-third capacitor C37 also have the function of energy storage.

The voltage value suitable for the working of each device in the torque measuring equipment can be obtained through conversion by the voltage conversion module, and the normal working of the torque measuring equipment is ensured.

In one implementation, as shown in fig. 10, the wireless data transmission apparatus 150 includes:

pin 8 of the data transmitting chip, which is a VCC (voltage supply) pin, connected to the third voltage output terminal, and one end of a fifteenth resistor R20;

a fifteenth resistor R20, the other end of which is connected to one end of the sixteenth resistor R19 and to pin 3 of the data transmitting chip, i.e., the EN (enable) pin;

a sixteenth resistor R19, the other end of which is connected to pin 1 of the data transmitting chip, i.e., the RST (RESET) pin;

a seventeenth resistor R21, one end of which is connected to the pin 12 of the data transmitting chip, i.e., the first input pin (IO0), the other end of which is connected to one end of an eighteenth resistor R22 and the third voltage output terminal, and the other end of the eighteenth resistor R22 is connected to the pin 11 of the data transmitting chip, i.e., the second input pin (IO 2);

a nineteenth resistor R23, one end of which is connected to pin 10 of the data transmitting chip, i.e., the third input pin (IO15), and the other end of which is connected to pin 9 of the data transmitting chip, i.e., GND (Ground), and is grounded;

a data receiving pin 15 of the data transmitting chip, namely an RXD0 pin, and a data transmitting pin 16, namely a TXD0 pin, are connected with the singlechip 140 and used for receiving data transmitted by the singlechip 140;

the fifteenth resistor R20, the seventeenth resistor R21, the eighteenth resistor R22 and the nineteenth resistor R23 are all 1 megaohm.

The wireless data transmitting device 150 may also be referred to as a WIFI module. The data sending chip can be ESP-07S, and the ESP-07S includes a plurality of sub-chips, most importantly, an ESP8266 chip. ESP8266 chip serial ports WIFI _ IN _ TX and WIFI _ IN _ RX are connected with single-chip microcomputer serial ports UART2_ RX and UART2_ TX, the single-chip microcomputer sends data to a WIFI module through the serial ports, the WIFI module sends the data to a receiver for receiving WIFI signals, and then measured torque values are displayed.

The operating temperature of the ESP8266 chip ranges from 45 to 80 degrees below zero. The functions of R21, R22, and R23 are mode selection. In the embodiment of the present invention, a data transmission mode is used.

Pins

10, 11, and 12 are GPIO15, GPIO0, and GPIO2, respectively. These three pins are used for setting up different modes, and wherein, the serial ports mode corresponds to and is: GPIO15, GPIO0 are set low and GPIO2 is set high; the flash memory startup corresponds to: GPIO15 is set low and GPIO2, GPIO0 are set high.

In one implementation, as shown in fig. 11, a power transmission module includes:

a direct current Input end connected to one end of a thirty-fifth capacitor C29, one end of a thirty-sixth capacitor C30, one end of a second inductor L5, a pin 4 of the Voltage regulator, namely a VIN (Voltage Input) pin, and a pin 2, namely an EN (enable) pin; a thirty-fifth capacitor C29 and a thirty-sixth capacitor C30, and the other end of the capacitors is grounded; pin 1 of the voltage regulator, namely, a GND (Ground) pin is grounded;

a second inductor L5, the other end of which is connected to a thirty-seventh capacitor C40, one end of a thirty-eighth capacitor C1, and pins 3 and 6 of the regulator, i.e., SW (switch node) pins;

the other ends of the thirty-seventh capacitor C40 and the thirty-eighth capacitor C1 are connected with one end of a third inductor L4 and the anode of a second diode D2; a third inductor L4, the other end of which is grounded; the cathode of the second diode D2 is connected with one end of a twentieth resistor R6, a thirty-ninth capacitor C31, a forty-fourth capacitor C91, one end of a forty-first capacitor C92 and a second pin of the direct current-to-alternating current module;

a thirty-ninth capacitor C31, a forty-first capacitor C91 and a forty-first capacitor C92, the other ends of which are all grounded; a twentieth resistor R6, the other end of which is connected to the twenty-first resistor R60, one end of the twenty-second resistor R10, and a pin 5 of the regulator, i.e., a FB (FeedBack) pin; a twenty-first resistor R60, the other end of which is grounded; a twenty-second resistor R10, the other end of which is connected with the third pin of the transistor Q2; a transistor Q2, the second pin being connected to ground;

a first pin of the direct current-to-alternating current module is grounded; and the third pin and the fourth pin of the direct current-to-alternating current module are both connected with the sending coil.

The voltage regulator may be XL6009E 1. The input direct current voltage passes through an XL6009E1 voltage regulator, which is a voltage regulator with wide input range and capable of generating positive and negative voltages, and the voltage required by the coil is output.

The thirty-fifth capacitor C29 is 220 microfarads; a thirty-sixth capacitor C30 is 1 microfarad; a thirty-seventh capacitor C40 of 10 microfarads; a thirty-eighth capacitor C1 of 22 microfarads; a thirty-ninth capacitor C31 of 100 microfarads; a forty-th capacitor C91 of 100 microfarads; a forty-first capacitance C92 of 1 microfarad; the twentieth resistor R6 is 7.15 kilo-ohms; the twenty-first resistor R60 is 1 kilo-ohm; the twenty-second resistor R10 is 4.99 kohms.

The third inductor L4, the second inductor L5, and the thirty-eighth capacitor C1 function as energy storage. The twentieth resistor R6, the twenty-first resistor R60, the twenty-second resistor R10, and the transistor Q2 function to regulate the magnitude of the voltage output.

Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A torque measurement device, comprising: the device 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;

the wireless power supply device includes: the power transmission module is used for generating a first alternating voltage; the transmitting coil is connected with the power transmission transmitting module and used for receiving the first alternating voltage; a receiving coil arranged in parallel with the transmitting coil for generating a second alternating voltage; an input interface (P3) connected with the receiving coil, connected with a first pin of a rectifier bridge (D2) through a first voltage input pin, and connected with a second pin of the rectifier bridge (D2) through a second voltage input pin; for sending the second alternating voltage to the rectifier bridge (D2); the third pin of the rectifier bridge (D2) is connected with the anode of a first diode (D4); a fourth pin of the rectifier bridge (D2) is connected with the negative electrode of the first diode (D4); the negative electrode of the first diode (D4) is also connected with one end of a first capacitor (C8), a second capacitor (C9), a third capacitor (C10), a fourth capacitor (C11), a fifth capacitor (C12), a sixth capacitor (C13), a seventh capacitor (C14) and an eighth capacitor (C15); the anode of the first diode (D4) is grounded and is connected with 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 apparatus includes: the device comprises a first voltage conversion module, a second voltage conversion module and a third voltage conversion module; a first voltage input end of the first voltage conversion module is connected with a negative electrode of the first diode (D4); a first voltage output end of the first voltage conversion module is connected with a second voltage input end of the second voltage conversion module and a third voltage input end of the third voltage conversion module;

the analog-to-digital conversion apparatus includes: the first voltage input pin of the analog-to-digital converter AD7190, the ninth capacitor (C26), the tenth capacitor (C27), one end of the eleventh capacitor (C23), the positive pin of a feedback signal of a strain sensor interface (P2) and the positive reference input pin of the analog-to-digital converter are connected with the second voltage output end of the second voltage conversion module; the other ends of the ninth capacitor (C26), the tenth capacitor (C27) and the eleventh capacitor (C23) are all grounded; the second voltage input pin of the analog-to-digital converter connected with the third voltage output end of the third voltage conversion module, one end of a twelfth capacitor (C28) and one end of a thirteenth capacitor (C29) are connected; the other ends of the twelfth capacitor (C28) and the thirteenth capacitor (C29) are grounded; the power supply positive pin of the strain sensor interface (P2) is connected with a fourteenth capacitor (C33), one end of a first resistor (R17), one end of a fifteenth capacitor (C32) and a negative reference input pin of the analog-to-digital converter, and a bridge low-voltage conversion ground pin; the fourteenth capacitor (C33) and the first resistor (R17) are grounded at the other end; the other end of the fifteenth capacitor (C32) is connected with one end of a sixteenth capacitor (C25) and a positive reference input pin of the analog-to-digital converter; the sixteenth capacitor (C25), the other end is grounded; the negative pin of the feedback signal of the strain sensor interface (P2) is connected with one end of a second resistor (R15); the other end of the second resistor (R15) is connected with a seventeenth capacitor (C24), one end of an eighteenth capacitor (C30) and a first analog input pin of the analog-to-digital converter; the seventeenth capacitor (C24), the other end is grounded; the other end of the eighteenth capacitor (C30) is connected with the third resistor (R16), one end of a 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 with a power supply negative pin of the strain sensor interface (P2); the nineteenth capacitor (C31) has the other end grounded; the serial data output/data ready output pin of the analog-to-digital converter is connected with the singlechip and used for sending the processed data to the singlechip; the strain sensor interface (P2) is used for sending the voltage difference generated by the strain gauge to the analog-to-digital converter;

2. The apparatus of claim 1,

the negative pole of the first diode (D4) has the voltage of 35V;

3. The apparatus of claim 2, wherein the first voltage conversion module comprises:

the first voltage input end is connected with one end of a twentieth capacitor (C39), one end of a twenty-first capacitor (C40), one end of a fourth resistor (R29) and a voltage input pin of the converter;

the other ends of the twentieth capacitor (C39) and the twenty-first capacitor (C40) are grounded; the other end of the fourth resistor (R29) is connected with one end of a fifth resistor (R2) and an enabling pin of the converter; the mode/sync pin of the converter is grounded; the other end of the fifth resistor (R2) is grounded;

the first voltage output end is connected with one end of a voltage output pin of the converter, a sixth resistor (R30), a twenty-second capacitor (C41) and a twenty-third capacitor (C42);

the other ends of the twenty-second capacitor (C41) and the twenty-third capacitor (C42) are grounded; the other end of the sixth resistor (R30) is connected with a feedback pin of the converter and one end of a seventh resistor (R31); the other end of the seventh resistor (R31) is grounded;

4. The apparatus of claim 3,

the twentieth capacitance (C39) is 10 microfarads; the twenty-first capacitance (C40) is 100 nanofarads; the twenty-second capacitance (C41) is 22 microfarads; said twenty-third capacitance (C42) is 100 nanofarads;

the fourth resistance (R29) is 220 kilo-ohms; the fifth resistance (R2) is 143 kilo-ohms; the sixth resistance (R30) is 33 kilo-ohms; the seventh resistance (R31) is 8.06 kilo-ohms.

5. The wireless power supply apparatus according to claim 2, wherein the second voltage conversion module comprises:

the second voltage input end is connected with one end of a twenty-fourth capacitor (C16), one end of a twenty-fifth capacitor (C17) and one end of an eighth resistor (R9), and a first voltage input pin, a second voltage input pin and a soft start control pin of the voltage stabilizer;

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 with an enabling pin of the voltage stabilizer;

the noise reduction pin of the voltage stabilizer is connected with one end of a 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 stabilizer are connected with one end of a ninth resistor (R11), a twenty-seventh capacitor (C19), a twenty-eighth capacitor (C20), a twenty-ninth capacitor (C21), a tenth resistor (R12) and an eleventh resistor (R13);

the other end of the ninth resistor (R11) is connected with the other end of the twenty-seventh capacitor (C19), a feedback pin of the voltage stabilizer and one end of a twelfth resistor (R10); the twelfth resistor (R10), the twenty-eighth capacitor (C20) and the twenty-ninth capacitor (C21) are all grounded at the other end; the tenth resistor (R12) is connected with the other end of the tenth resistor and the power good indicator pin of the voltage stabilizer; the other end of the eleventh resistor (R13) is connected with one end of a thirtieth capacitor (C22) and the second voltage output end; the thirtieth capacitor (C22) and the other end of the thirtieth capacitor are grounded;

and the ground pin of the voltage stabilizer is grounded.

6. The apparatus of claim 5,

the twenty-fourth capacitance (C16) is 10 microfarads; the twenty-fifth capacitance (C17) is 100 nanofarads; the twenty-sixth capacitance (C18) is 100 nanofarads; the twenty-seventh capacitance (C19) is 10 nanofarads; the twenty-eighth capacitance (C20) is 10 microfarads; the twenty-ninth capacitance (C21) is 100 nanofarads; the thirtieth capacitor (C22) is 100 nanofarads;

-said eighth resistance (R9) is 100 kilo-ohms; the ninth resistance (R11) is 10.5 kilo-ohms; the tenth resistance (R12) is 20 kilo-ohms; the eleventh resistance (R13) is 1-2 ohms; the twelfth resistor (R10) is 2 kilo-ohms.

7. The apparatus of claim 2, wherein the third voltage conversion module comprises:

the third voltage input end is connected with 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 grounded; the other end of the thirteenth resistor (R029) is connected with an enabling pin of the switching regulator;

a voltage selection pin of the switching regulator is connected with one end of a fourteenth resistor (R32); the other end of the fourteenth resistor (R32) is grounded;

the third voltage output end is connected with one end of a first inductor (L1), one end of a thirty-third capacitor (C37), one end of a thirty-fourth capacitor (C38) and a detection pin of the switching regulator; the other end of the first inductor (L1) is connected with a switch pin of the switching regulator; the other ends of the thirty-third capacitor (C37) and the thirty-fourth capacitor (C38) are grounded;

the ground pin of the switching regulator is grounded;

the thirty-first capacitance (C35) is 4.7 microfarads; the thirty-second capacitance (C36) is 100 nanofarads; the thirty-third capacitance (C37) is 10 microfarads; the thirty-fourth capacitance (C38) is 100 nanofarads; said thirteenth resistance (R029) is 100 kilo-ohms; the fourteenth resistance (R32) is 249 kilo-ohms; the first inductance (L1) is 470 nanohenries.

8. The apparatus according to any one of claims 1 to 7, wherein the wireless data transmission means comprises:

a chip supply voltage pin of the data sending chip connected with the third voltage output end and one end of a fifteenth resistor (R20);

the other end of the fifteenth resistor (R20) is connected with one end of a sixteenth resistor (R19) and an enabling pin of the data sending chip;

the other end of the sixteenth resistor (R19) is connected with a 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 transmitting chip, the other end of which is connected to one end of an eighteenth resistor (R22) and the third voltage output terminal, the other end of the eighteenth resistor (R22) being connected to the second input pin of the data transmitting chip;

a nineteenth resistor (R23), one end of which is connected to the third input pin of the data transmitting chip and the other end of which is connected to the ground pin of the data transmitting chip and is grounded;

the fifteenth resistor (R20), the seventeenth resistor (R21), the eighteenth resistor (R22) and the nineteenth resistor (R23) are all 1 megaohm.

9. The apparatus according to any one of claims 1 to 7,

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 capacitance (C26) is 4.7 microfarads; the tenth capacitance (C27) is 100 nanofarads; the eleventh capacitance (C23) is 100 nanofarads; the twelfth capacitance (C28) is 4.7 microfarads; the thirteenth capacitor (C29) is 100 nanofarads; the fourteenth capacitance (C33) is 10 nanofarads; the fifteenth capacitance (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 resistance (R15) is 100 ohms; the third resistance (R16) is 100 ohms.

10. The apparatus of any of claims 1-7, wherein the power transmission module comprises:

the direct current input end is connected with one end of a thirty-fifth capacitor (C29), one end of a thirty-sixth capacitor (C30), one end of a second inductor (L5), and a voltage input pin and an enabling pin of the voltage stabilizer; the thirty-fifth capacitor (C29) and the thirty-sixth capacitor (C30) are connected with the other end of the capacitor to ground; the ground pin of the voltage stabilizer is grounded;

the other end of the second inductor (L5) is connected with one end of a thirty-seventh capacitor (C40), one end of a thirty-eighth capacitor (C1), and a first switching node pin and a second switching node pin of the voltage stabilizer;

the other end of each of the thirty-seventh capacitor (C40) and the thirty-eighth capacitor (C1) is connected with one end of a third inductor (L4) and the anode of a second diode (D2); the other end of the third inductor (L4) is grounded; the cathode of the second diode (D2) is connected with a twentieth resistor (R6), a thirty-ninth capacitor (C31), a forty-th capacitor (C91), one end of a forty-first capacitor (C92) and a second pin of the direct current-to-alternating current module;

the thirty-ninth capacitor (C31), the forty-first capacitor (C91) and the forty-first capacitor (C92) are all grounded at the other end; the other end of the twentieth resistor (R6) is connected with the twenty-first resistor (R60), one end of the twenty-second resistor (R10) and a feedback pin of the voltage stabilizer; the twenty-first resistor (R60) is grounded at the other end; the other end of the twenty-second resistor (R10) is connected with a third pin of a transistor (Q2); the transistor (Q2), the second pin is grounded;

the thirty-fifth capacitance (C29) is 220 microfarads; the thirty-sixth capacitance (C30) is 1 microfarad; the thirty-seventh capacitance (C40) is 10 microfarads; the thirty-eighth capacitance (C1) is 22 microfarads; the thirty ninth capacitance (C31) is 100 microfarads; said fortieth capacitance (C91) is 100 microfarads; said forty-first capacitance (C92) is 1 microfarad; the twentieth resistance (R6) is 7.15 kilo-ohms; the twenty-first resistance (R60) is 1 kilo-ohm; the twenty-second resistance (R10) is 4.99 kohms.