CN110873618A - A torque measuring device - Google Patents

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

A torque measuring device

technical field

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

Background technique

With the development of the domestic automobile industry, new models emerge in an endless stream, and automobile bench and road tests 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.

The existing torque measurement methods mainly include the transmission measurement method of resistance strain gauge type. Torque will produce a certain strain on the product to be tested, and this strain has a proportional relationship with the magnitude of the torque, so 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, pasting the resistance strain gauge in this direction can detect the torque on the drive shaft.

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

SUMMARY OF THE INVENTION

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

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

The wireless power supply device includes: a power transmission and transmission module for generating a first AC voltage; a transmission coil, connected to the power transmission and transmission module, for receiving the first AC voltage; a receiving coil arranged in parallel with the transmission coil , used to generate the second AC voltage; the input interface connected to the receiving coil is connected to the first pin of the rectifier bridge through the first voltage input pin, and is connected to the first pin of the rectifier bridge through the second voltage input pin The two pins are connected; it is used to send the second AC voltage to the rectifier bridge; the third pin of the rectifier bridge is connected to the anode of the first diode; the fourth pin of the rectifier bridge , connected to the negative electrode of the first diode; the negative electrode of the first diode is also connected to the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the third capacitor The seventh capacitor and the eighth capacitor are connected to one end; the anode of the first diode is grounded, and is connected to the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor The capacitor and the other end of the eighth capacitor are connected;

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 negative electrode of the first diode ; the first voltage output terminal of the first voltage conversion module is connected to the second voltage input terminal of the second voltage conversion module and the third voltage input terminal of the third voltage conversion module;

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

The single-chip microcomputer is used for sending the data to the wireless data sending device.

Optionally, the cathode of the first diode has a voltage of 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.

Optionally, the first voltage conversion module includes:

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

The other ends of the twentieth capacitor and the twenty-first capacitor are both grounded; the other end of the fourth resistor is connected to one end of the fifth resistor and the enable pin of the converter; the mode/ The synchronization pin is grounded; the other end of the fifth resistor is grounded;

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

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

The ground pins and thermal pad pins of the converter are grounded.

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

The fourth resistance is 220 kiloohms; the fifth resistance is 143 kiloohms; the sixth resistance is 33 kiloohms; and the seventh resistance is 8.06 kiloohms.

Optionally, the second voltage conversion module includes:

The second voltage input end, one end of the twenty-fourth capacitor, the twenty-fifth capacitor, the eighth resistor, and the first voltage input pin, the second voltage input pin, and the soft-start control tube of the regulator feet connected

The other end of the twenty-fourth capacitor and the twenty-fifth capacitor is grounded; the other end of the eighth resistor is connected to the enable pin of the voltage regulator;

The noise reduction pin of the voltage stabilizer is connected to one end of the 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 to one end of the ninth resistor, the twenty-seventh capacitor, the twenty-eighth capacitor, the twenty-ninth capacitor, the tenth resistor and the eleventh resistor. connected;

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

The ground pin of the voltage regulator is grounded.

Optionally, the twenty-fourth capacitor is 10 microfarads; the twenty-fifth capacitor is 100 nanofarads; the twenty-sixth capacitor is 100 nanofarads; the twenty-seventh capacitor is 10 nanofarads method; 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 kiloohms; the ninth resistance is 10.5 kiloohms; the tenth resistance is 20 kiloohms; the eleventh resistance is 1-2 ohms; the twelfth resistance is 2 k ohms.

Optionally, the third voltage conversion module includes:

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

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

The third voltage output terminal is connected to the first inductor, one end of the thirty-third capacitor, the thirty-fourth capacitor, and the detection pin of the switching regulator; the other end of the first inductor is connected to the switching regulator. The switch pins of the voltage regulator are connected; 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 capacitor is 4.7 microfarads; the thirty-second capacitor is 100 nanofarads; the thirty-third capacitor is 10 microfarads; the thirty-fourth capacitor is 100 nanofarads; the The thirteenth resistance is 100 kiloohms; the fourteenth resistance is 249 kiloohms; the first inductance is 470 nanohenries.

Optionally, the wireless data sending device includes:

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

the fifteenth resistor, the other end is connected to one end of the sixteenth resistor and the enable pin of the data sending chip;

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

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

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

Both the data receiving pin and the data sending pin of the data sending chip are connected to the single chip microcomputer, and are used for receiving the data sent by the single chip computer;

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

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 capacitance is 100 nanofarads; the tenth capacitance is 100 nanofarads; The fourth capacitor is 10 nanofarads; the fifteenth capacitor is 1 microfarad; the sixteenth capacitor is 10 nanofarads; the seventeenth capacitor is 10 nanofarads; the eighteenth capacitor is 1 microfarad ; The nineteenth capacitor is 10 nanofarads;

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

Optionally, the power transmission and transmission module includes:

The DC input terminal is connected to the thirty-fifth capacitor, the thirty-sixth capacitor, one end of the second inductor, and the voltage input pin and the enabling pin of the voltage regulator; the thirty-fifth capacitor, the thirty-sixth capacitor capacitor, the other end is grounded; the ground pin of the voltage stabilizer is grounded;

The other end of the second inductor is connected to the thirty-seventh capacitor, one end of the thirty-eighth capacitor, and the first switch node pin and the second switch node pin of the voltage regulator;

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

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

The first pin of the DC-to-AC module is grounded; the third and fourth pins of the DC-to-AC module are both connected to 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 capacitor is 22 microfarads; the The thirty-ninth capacitor is 100 microfarads; the fortieth capacitor is 100 microfarads; the forty-first capacitor is 1 microfarad; the twentieth resistor is 7.15 kΩ; the twenty-first The resistance was 1 kiloohm; the twenty-second resistance was 4.99 kiloohms.

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

The innovative points of the embodiments of the present invention include:

1. By connecting the strain sensor interface, the voltage signal generated by the strain gauge can be directly extracted. The process of extracting the voltage signal will not cause any signal fluctuation, thus improving the accuracy of the torque measurement result. In addition, the AD7190 analog-to-digital converter has high calculation accuracy. The analog-to-digital converter converts the voltage signal generated by the strain gauge into a digital signal for output, which can further improve the accuracy of the final torque measurement result. Compared with the known wired power supply mode, the signal fluctuation can be reduced by using the wireless power supply device to supply power to the torque measurement device, thereby improving the accuracy of the torque measurement result. The wireless data transmission device can realize the wireless data transmission. Compared with the known method of wired data transmission through the conductive slip ring, the signal fluctuation caused by the frictional contact of the slip ring can be reduced, thereby improving the accuracy of the torque measurement result. .

2. The voltage value suitable for the work of each device in the torque measuring device can be converted through the voltage conversion module, so as to ensure the normal operation of the torque measuring device.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural 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 present invention;

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

Fig. 4 is a kind of installation appearance schematic diagram of each device in the shaft torque measuring equipment;

Figure 5 is a schematic diagram of an actual installation effect of each device in the shaft torque measuring equipment;

Figure 6(a) and Figure 6(b) are schematic diagrams of an actual installation effect of each device in the flywheel series torque measuring equipment;

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

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

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

10 is a schematic structural diagram of a wireless data sending apparatus according to an embodiment of the present invention;

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

Detailed ways

The technical solutions 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. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

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

The embodiment of the present invention discloses a torque measurement device, which can improve the accuracy of torque measurement results.

In the embodiment of the present invention, the magnitude of the torque received by the transmission shaft can be measured by pasting a resistance strain gauge on the transmission shaft. In addition, in order to ensure the accuracy of the torque measurement results 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 results, the power supply can be supplied wirelessly, and the strain gauge can be directly connected to the strain gauge by connecting the strain sensor interface. The generated voltage signal is extracted. The embodiments of the present invention will be described in detail below.

FIG. 1 is a schematic structural diagram of a torque measuring device provided by an embodiment of the present invention. The torque measurement 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 .

The wireless power supply device 110 may wirelessly power the torque measuring device. After the wireless power supply device 110 supplies power, since the voltage values required by each device in the torque measuring device are different, the voltage generated by the wireless power supply device 110 can be converted into different voltage values through 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 the digital signal 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 .

Specifically, as shown in FIG. 2 , the wireless power supply device 110 may include: a power transmission and transmission module for generating a first AC voltage; a transmission coil, connected to the power transmission and transmission module for receiving the first AC voltage; and arranged in parallel with the transmission coil The receiving coil is used to generate the second AC voltage; the input interface P3 connected to the receiving coil is connected to the first pin of the rectifier bridge D2 through the first voltage input pin, and is connected to the rectifier bridge D2 through the second voltage input pin It is used to send the second AC voltage to the rectifier bridge D2; the third pin of the rectifier bridge D2 is connected to the anode of the first diode D4; the fourth pin of the rectifier bridge D2 is connected to the The cathode of the first diode D4 is connected; the cathode of the first diode D4 is also connected to the first capacitor C8, the second capacitor C9, the third capacitor C10, the fourth capacitor C11, the fifth capacitor C12, and the sixth capacitor C13 , the seventh capacitor C14 and the eighth capacitor C15 are connected to one end; the anode of the first diode D4 is grounded, and is connected to the first capacitor C8, the second capacitor C9, the third capacitor C10, the fourth capacitor C11, the fifth capacitor C12, The other ends of the sixth capacitor C13, the seventh capacitor C14, and the eighth capacitor C15 are connected to each other.

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

The above-mentioned first diode D4, namely the transient voltage suppression tube SMAJ33A, has a working 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 to filter and also to store energy. The role of D2 is the role of the rectifier bridge, which is AC to DC. D4 is a transient suppression diode, which clamps the voltage at 33V and also acts as a 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 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 negative electrode of the first diode D4; the first voltage conversion module The first voltage output terminal of the 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.

That is to say, 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 the voltages generated by the first voltage conversion module, the second voltage conversion module, and the third voltage conversion module are respectively converted to obtain the voltage. different voltage values.

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

In the embodiment of the present invention, the voltage difference generated by the deformation of the strain gauge can be sent to the analog-to-digital converter AD7190 through P2, and the analog-to-digital converter AD7190 can also be called an amplifier. The single chip 140 can control its magnification by sending commands to the G1 and G0 ports of the amplifier through the SPI.

The AD7190 is a low noise, complete analog front end amplifier for high end precision measurement applications. AD7190 also has zero delay function, it outputs the data rate range of 4.7Hz-4.8kHz. The chip can work in the range of minus 40 degrees to 105 degrees.

When pin AIN3 is used together with pin AIN4, pin AIN3 can be configured as the positive input of a fully differential input pair, and pin AIN4 can be configured as the negative input of 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; the seventeenth capacitor C24 is 10 nanofarads; the eighteenth capacitor C30 is 1 microfarad; The nineteenth capacitor C31 is 10 nanofarads; the second resistor R15 is 100 ohms; the third resistor R16 is 100 ohms.

The functions of each capacitor in the analog-to-digital conversion device 130 are to filter out clutter, and the functions of the second resistor R15 and the third resistor R16 are to filter common-mode clutter to ensure the accuracy of the analog-to-digital conversion result, thereby improving the accuracy of the torque measurement result. accuracy.

The single chip 140 is used for sending 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 .

It can be seen from the above content that the torque measurement device provided by the embodiment of the present invention can directly extract the voltage signal generated by the strain gauge through the interface of the strain sensor, and the process of extracting the voltage signal will not cause any signal fluctuation, so that the torque measurement can be improved. accuracy of results. In addition, the AD7190 analog-to-digital converter has high calculation accuracy. The analog-to-digital converter converts the voltage signal generated by the strain gauge into a digital signal for output, which can further improve the accuracy of the final torque measurement result. Compared with the known wired power supply mode, the signal fluctuation can be reduced by using the wireless power supply device to supply power to the torque measurement device, thereby improving the accuracy of the torque measurement result. The wireless data transmission device can realize the wireless data transmission. Compared with the known method of wired data transmission through the conductive slip ring, the signal fluctuation caused by the frictional contact of the slip ring can be reduced, thereby improving the accuracy of the torque measurement result. .

In a specific embodiment, as shown in FIG. 4 , it shows a schematic diagram of the installation appearance of each device in the shaft torque measuring device. Correspondingly, FIG. 5 is a schematic diagram of an actual installation effect of each device in the shaft torque measuring device. The installation position of the collection 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.

Figures 6(a) and 6(b) are schematic diagrams of an actual installation effect of each device in the flywheel series torque measuring equipment. The installation position of the collection 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.

As an implementation of the embodiment of the present invention, the voltage of the negative electrode 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.

In an implementation manner, as shown in FIG. 7 , the first voltage conversion module includes:

The first voltage input terminal is connected to the twentieth capacitor C39, the twenty-first capacitor C40, one end of the fourth resistor R29, and the pin 3 of the converter, that is, the VIN (Voltage Input, voltage input) pin;

The other ends of the twentieth capacitor C39 and the twenty-first capacitor C40 are both grounded; the other end of the fourth resistor R29 is connected to one end of the fifth resistor R2 and the pin 4 of the converter, that is, the EN (enable) pin ; Pin 2 of the converter, that is, the MODE/SYNC (mode/synchronization) pin is grounded; the other end of the fifth resistor R2 is grounded;

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

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

The pin 1 of the converter, that is, the GND (Ground, ground) pin, and the pin 11, that is, the PAD (Thermal Pad, thermal pad) pin, are grounded.

The above converter can be the LMZM23601SILR. The 35V voltage is converted to 5.1V by a non-isolated DC/DC converter LMZM23601SILR. The chip LMZM23601SILR has a wide operating input voltage from 1.4V to 36V, and the output voltage is adjustable from 2.5V to 15V.

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 capacitor C42 is 100 nanofarads.

The functions of the twentieth capacitor C39, the twenty-first capacitor C40, the twenty-second capacitor C41, and the twenty-third capacitor C42 are all filtering to obtain a more accurate and stable voltage. The smaller the capacitance, the stronger the ability to filter high frequencies, and the larger the capacitance, the stronger the ability to filter low frequencies. The twentieth capacitor C39 and the twenty-second capacitor C41 also function as energy storage.

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

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

In an implementation manner, as shown in FIG. 8 , the second voltage conversion module includes:

The second voltage input terminal is connected with the twenty-fourth capacitor C16, the twenty-fifth capacitor C17, one end of the eighth resistor R9, and the pin 10 of the voltage regulator, namely the VIN (Input, voltage input) pin and pin 9 , that is, the VIN pin and pin 6, that is, the SS_CTRL (soft start control) pin is connected;

The other end of the twenty-fourth capacitor C16 and the twenty-fifth capacitor C17 is grounded; the other end of the eighth resistor R9 is connected to the pin 7 of the voltage regulator, that is, the EN (enable) pin;

The pin 8 of the voltage regulator, the NR/SS (noise reduction) pin, is connected to one end of the twenty-sixth capacitor C18; the other end of the twenty-sixth capacitor C18 is grounded;

The pin 1 and pin 2 of the regulator, that is, the OUT (output) pin, are connected with the ninth resistor R11, the twenty-seventh capacitor C19, the twenty-eighth capacitor C20, the twenty-ninth capacitor C21, and the tenth resistor. R12, one end of the eleventh resistor R13 is connected;

The other end of the ninth resistor R11 is connected to the other end of the twenty-seventh capacitor C19, the pin 3 of the regulator, namely the FB (FeedBack, feedback) pin, and one end of the twelfth resistor R10; the twelfth resistor R10, the first The other ends of the twenty-eighth capacitor C20 and the twenty-ninth capacitor C21 are grounded; the other end of the tenth resistor R12 is connected to the pin 5 of the voltage regulator, that is, the PG (power-good, power good indicator) pin; The other end of the eleventh resistor R13 is connected to one end of the thirtieth capacitor C22 and the second voltage output end; the other end of the thirtieth capacitor C22 is grounded;

The pin 4 of the voltage regulator, that is, the GND (Ground, ground) pin is grounded.

FB pin, used to set the output voltage of the device. PG pin, open drain for 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 noise generated by the internal bandgap reference. External capacitors reduce output noise to very low levels and set the output slope to limit inrush current.

The above voltage regulator can be TPS7A9001DSKR. The TPS7A9001DSKR chip is a low noise (4.7μVRMS), low dropout (LDO) regulator capable of delivering 500mA with a maximum dropout of only 100mV to 5V and 200mV to 5.7V. Its output is adjustable with 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 features 1% output voltage accuracy (overline, load and temperature) and soft-start capability. It is ideal for supply-sensitive analog low-voltage devices.

The twenty-fourth capacitor C16 above 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 functions of the twenty-fourth capacitor C16, the twenty-fifth capacitor C17, the twenty-eighth capacitor C20, and the thirtieth capacitor C22 are filtering to obtain a more accurate and stable voltage. The smaller the capacitance, the stronger the ability to filter high frequencies, and the larger the capacitance, the stronger the ability to filter low frequencies. The twenty-fourth capacitor C16 and the twenty-eighth capacitor C20 also function as energy storage. The function of the twenty-seventh capacitor C19 is to sharpen the wave.

The eighth resistor R9 is 100kΩ; the ninth resistor R11 is 10.5kΩ; the tenth resistor R12 is 20kΩ; the eleventh resistor R13 is 1-2Ω; the twelfth resistor R10 is 2kΩ.

In an implementation manner, as shown in FIG. 9 , the third voltage conversion module includes:

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

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 to the pin 6 of the switching regulator, that is, the EN (enable) pin;

Pin 5 of the switching regulator, that is, the VSEL/MODE pin is connected to one end of the fourteenth resistor R32; the other end of the fourteenth resistor R32 is grounded;

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

Pin 1 of the switching regulator, that is, the GND (Ground, ground) pin is grounded.

The above switching regulator can be TPS62802YKAR. The 5.1V voltage is converted to 3.3V voltage by the switching regulator TPS62802YKAR. The VOS pin is the output voltage sense pin for the internal feedback divider network and 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; and the thirty-fourth capacitor C38 is 100 nanofarads. The thirteenth resistor R029 is 100 kΩ; the fourteenth resistor R32 is 249 kΩ. The first inductance L1 is 470 nanohenries.

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

The functions of the thirty-first capacitor C35, the thirty-second capacitor C36, the thirty-third capacitor C37, and the thirty-fourth capacitor C38 are all filtering to obtain a more accurate and stable voltage. The smaller the capacitance, the stronger the ability to filter high frequencies; the larger the capacitance, the stronger the ability to filter low frequencies. The thirty-first capacitor C35 and the thirty-third capacitor C37 also function as energy storage.

The voltage value suitable for the work of each device in the torque measuring device can be converted through the voltage conversion module, so as to ensure the normal operation of the torque measuring device.

In an implementation manner, as shown in FIG. 10 , the wireless data sending apparatus 150 includes:

The pin 8 of the data sending chip connected to the third voltage output terminal, namely the VCC (Volt CurrentCondenser, chip supply voltage) pin and one end of the fifteenth resistor R20;

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

The other end of the sixteenth resistor R19 is connected to the pin 1 of the data transmission chip, that is, the RST (RESET, reset) pin;

One end of the seventeenth resistor R21 is connected to the pin 12 of the data sending chip, that is, the first input pin (IO0), and the other end is connected to one end of the eighteenth resistor R22 and the third voltage output end. The other end is connected to the pin 11 of the data sending chip, that is, the second input pin (IO2);

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

The data receiving pin 15 of the data sending chip, namely the RXD0 pin, and the data sending pin 16, namely the TXD0 pin, are both connected to the single-chip microcomputer 140, and are used to receive the data sent by the single-chip computer 140;

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

The above-mentioned wireless data transmitting apparatus 150 may also be referred to as a WIFI module. Among them, the data sending chip can be ESP-07S, ESP-07S includes multiple sub-chips, the most important one is 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 accepts the WIFI signal, and then displays the measured torque value.

The operating temperature range of the ESP8266 chip is minus 45 to 80 degrees. The functions of the above R21, R22, and R23 are mode selection. In this 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 to set different modes. The serial port mode corresponds to: GPIO15 and GPIO0 are set to low, and GPIO2 is set to high; the corresponding flash memory boot is: GPIO15 is set to low, and GPIO2 and GPIO0 are set to high.

In an implementation manner, as shown in Figure 11, the power transmission and transmission module includes:

The DC input end is connected with the thirty-fifth capacitor C29, the thirty-sixth capacitor C30, one end of the second inductor L5, and the pin 4 of the voltage regulator, namely the VIN (Voltage Input, voltage input) pin, and the pin 2 , that is, the EN (enable, enable) pin is connected; the thirty-fifth capacitor C29, the thirty-sixth capacitor C30, the other end is grounded; the pin 1 of the voltage regulator, that is, the GND (Ground, ground) pin is grounded;

The other end of the second inductor L5 is connected to the thirty-seventh capacitor C40, one end of the thirty-eighth capacitor C1, and the pins 3 and 6 of the voltage regulator, that is, the SW (switch node) pins;

The other ends of the thirty-seventh capacitor C40 and the thirty-eighth capacitor C1 are both connected to one end of the third inductor L4 and the anode of the second diode D2; the other end of the third inductor L4 is grounded; the cathode of the second diode D2 It is connected to one end of the twentieth resistor R6, the thirty-ninth capacitor C31, the fortieth capacitor C91, the forty-first capacitor C92, and the second pin of the DC to AC module;

The other ends of the thirty-ninth capacitor C31, the fortieth capacitor C91, and the forty-first capacitor C92 are all grounded; the other end of the twentieth resistor R6 is connected to one end of the twenty-first resistor R60, one end of the twenty-second resistor R10, and The pin 5 of the voltage regulator, that is, the FB (FeedBack, feedback) pin is connected; the twenty-first resistor R60, the other end is grounded; the twenty-second resistor R10, the other end is connected to the third pin of the transistor Q2; the transistor Q2 , the second pin is grounded;

The first pin of the DC-to-AC module is grounded; the third and fourth pins of the DC-to-AC module are both connected to the sending coil.

The aforementioned voltage regulator may be an XL6009E1. The input DC voltage passes the voltage required by the output coil of the XL6009E1 voltage stabilizer. This voltage stabilizer is a voltage stabilizer with a wide input range and can generate positive and negative voltages.

The thirty-fifth capacitor C29 is 220 microfarads; the thirty-sixth capacitor C30 is 1 microfarad; the thirty-seventh capacitor C40 is 10 microfarads; the thirty-eighth capacitor C1 is 22 microfarads; the thirty-ninth capacitor C1 is 22 microfarads; C31 is 100 microfarads; the fortieth capacitor C91 is 100 microfarads; the forty-first capacitor C92 is 1 microfarad; the twentieth resistor R6 is 7.15 kΩ; the twenty-first resistor R60 is 1 kΩ; Twelve resistors R10 are 4.99 kohms.

The functions of the third inductor L4, the second inductor L5, and the thirty-eighth capacitor C1 are to store energy. The functions of the twentieth resistor R6, the twenty-first resistor R60, the twenty-second resistor R10, and the transistor Q2 are to adjust the amplitude of the voltage output.

Those of ordinary skill in the art can understand that the accompanying drawing is only a schematic diagram of an embodiment, and the modules or processes in the accompanying drawing are not necessarily necessary to implement the present invention.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions in the embodiments of the present invention.

Claims (10)

1. A torque measuring device, comprising: a wireless power supply device, a voltage conversion device, an analog-to-digital conversion device, a single-chip microcomputer, and a wireless data transmission device; The wireless power supply device includes: a power transmission and transmission module for generating a first AC voltage; a transmission coil, connected to the power transmission and transmission module, for receiving the first AC voltage; a receiving coil arranged in parallel with the transmission coil , used to generate the second AC voltage; the input interface (P3) connected to the receiving coil is connected to the first pin of the rectifier bridge (D2) through the first voltage input pin, and is connected to the second voltage input pin through the first pin of the rectifier bridge (D2). The second pin of the rectifier bridge (D2) is connected; used to send the second alternating current voltage to the rectifier bridge (D2); the third pin of the rectifier bridge (D2) is connected to the first and second pins The anode of the pole tube (D4) is connected to the anode; 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), Also connected with the first capacitor (C8), the second capacitor (C9), the third capacitor (C10), the fourth capacitor (C11), the fifth capacitor (C12), the sixth capacitor (C13), and the seventh capacitor (C14) , one end of the eighth capacitor (C15) is connected; the anode of the first diode (D4) is grounded, and is connected to the first capacitor (C8), the second capacitor (C9), the third capacitor (C10), the The other ends of the fourth capacitor (C11), the fifth capacitor (C12), the sixth capacitor (C13), the seventh capacitor (C14), and the eighth capacitor (C15) are connected; The voltage conversion device includes: 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 and the first diode (D4) The negative 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 includes: a first voltage input pin of the analog-to-digital converter AD7190 connected to the second voltage output end of the second voltage conversion module, a ninth capacitor (C26), and a tenth capacitor (C27) , one end of the eleventh capacitor (C23), the positive pin of the feedback signal connected to the strain sensor interface (P2), and the positive reference input pin of the analog-to-digital converter; the ninth capacitor (C26), the tenth capacitor (C27), the eleventh capacitor (C23), the other ends of which are both grounded; the second voltage input pin of the analog-to-digital converter connected to the third voltage output end of the third voltage conversion module, the twelfth voltage input pin One end of the capacitor (C28) and the thirteenth capacitor (C29) are connected; the other ends of the twelfth capacitor (C28) and the thirteenth capacitor (C29) are grounded; the positive electrode of the power supply connected to the strain sensor interface (P2) Pin, with the fourteenth capacitor (C33), the first resistor (R17), one end of the fifteenth capacitor (C32), and the negative reference input pin of the analog-to-digital converter, bridge the low voltage conversion to the ground pin Connected; the other end of the fourteenth capacitor (C33) and the first resistor (R17) are grounded; the other end of the fifteenth capacitor (C32) is connected to one end of the sixteenth capacitor (C25) and the module The positive reference input pin of the digital converter is connected; the other end of the sixteenth capacitor (C25) is grounded; the negative pin of the feedback signal connected to the strain sensor interface (P2) is connected to one end of the second resistor (R15) ; The second resistor (R15), the other end is connected with the seventeenth capacitor (C24), one end of the eighteenth capacitor (C30), and the first analog input pin of the analog-to-digital converter; the tenth Seventh capacitor (C24), the other end is grounded; the other end of the eighteenth capacitor (C30) is connected to the third resistor (R16), one end of the nineteenth capacitor (C31), and the second analog of the analog-to-digital converter the input pin is connected; the other end of the third resistor (R16) is connected to the negative pin of the power supply connected to the strain sensor interface (P2); the other end of the nineteenth capacitor (C31) is grounded; The serial data output/data ready output pin of the digital converter is connected to the single-chip microcomputer for sending the processed data to the single-chip microcomputer; the connection to the strain sensor interface (P2) is used to generate the strain gauge The voltage difference is sent to the analog-to-digital converter; The single-chip microcomputer is used for sending the data to the wireless data sending device. 2. The device according to claim 1, characterized in that, The negative electrode of the first diode (D4) has a voltage of 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. 3. The device according to claim 2, wherein the first voltage conversion module comprises: the first voltage input terminal is connected to one end of the twentieth capacitor (C39), the twenty-first capacitor (C40), the fourth resistor (R29), and the voltage input pin of the converter; The other ends of the twentieth capacitor (C39) and the twenty-first capacitor (C40) are both grounded; the other end of the fourth resistor (R29) is connected to one end of the fifth resistor (R2), and the use of the converter. The energy pin is connected; the mode/synchronization pin of the converter is grounded; the other end of the fifth resistor (R2) is grounded; The first voltage output terminal is connected to the voltage output pin of the converter, the sixth resistor (R30), the twenty-second capacitor (C41), and one end of the twenty-third capacitor (C42); The other ends of the twenty-second capacitor (C41) and the twenty-third capacitor (C42) are both grounded; the other end of the sixth resistor (R30) is connected to the feedback pin of the converter and the seventh resistor (R31). ) is connected at one end; the other end of the seventh resistor (R31) is grounded; The ground pins and thermal pad pins of the converter are grounded. 4. The device of claim 3, wherein The twentieth capacitor (C39) is 10 microfarads; the twenty-first capacitor (C40) is 100 nanofarads; the twenty-second capacitor (C41) is 22 microfarads; Capacitance (C42) is 100 nanofarads; The fourth resistor (R29) is 220 kΩ; the fifth resistor (R2) is 143 kΩ; the sixth resistor (R30) is 33 kΩ; the seventh resistor (R31) is 8.06 kΩ Europe. 5. The wireless power supply device according to claim 2, wherein the second voltage conversion module comprises: The second voltage input end is connected with one end of the twenty-fourth capacitor (C16), the twenty-fifth capacitor (C17), the eighth resistor (R9), and the first voltage input pin of the regulator, the second voltage The input pin and the soft-start control pin are connected; The other end of the twenty-fourth capacitor (C16) and the twenty-fifth capacitor (C17) is grounded; the other end of the eighth resistor (R9) is connected to the enable pin of the voltage regulator; The noise reduction pin of the voltage stabilizer is connected to one end of the twenty-sixth capacitor (C18); the other end of the twenty-sixth capacitor (C18) is grounded; The first output pin and the second output pin of the voltage regulator are connected with the ninth resistor (R11), the twenty-seventh capacitor (C19), the twenty-eighth capacitor (C20), the twenty-ninth capacitor ( C21), the tenth resistor (R12), and the eleventh resistor (R13) are connected at one end; The other end of the ninth resistor (R11) is connected to the other end of the twenty-seventh capacitor (C19), the feedback pin of the voltage regulator, and one end of the twelfth resistor (R10); the twelfth resistor (R10) The other end of the resistor (R10), the twenty-eighth capacitor (C20), and the twenty-ninth capacitor (C21) are grounded; the other end of the tenth resistor (R12) has a good power supply with the voltage stabilizer The indicator pins are connected; the eleventh resistor (R13), the other end is connected to one end of the thirtieth capacitor (C22) and the second voltage output end; the thirtieth capacitor (C22), the other end ground; The ground pin of the voltage regulator is grounded. 6. The device of claim 5, wherein: 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 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 eighth resistance (R9) is 100 kiloohms; the ninth resistance (R11) is 10.5 kiloohms; the tenth resistance (R12) is 20 kiloohms; the eleventh resistance (R13) is 1 -2 ohms; the twelfth resistor (R10) is 2 kohms. 7. The device according to claim 2, wherein the third voltage conversion module comprises: The third voltage input terminal is connected to one end of the thirty-first capacitor (C35), the thirty-second capacitor (C36), the thirteenth resistor (R029), and the 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 to the enable pin of the switching regulator ; The voltage selection pin of the switching regulator is connected to one end of the fourteenth resistor (R32); the other end of the fourteenth resistor (R32) is grounded; The third voltage output terminal is connected with one end of the first inductor (L1), the thirty-third capacitor (C37), the thirty-fourth capacitor (C38), and the detection pin of the switching regulator; the first The other end of an inductor (L1) is connected to the switch pin of the switching regulator; the other ends of the thirty-third capacitor (C37) and the thirty-fourth capacitor (C38) are grounded; the ground pin of the switching regulator is grounded; The thirty-first capacitor (C35) is 4.7 microfarads; the thirty-second capacitor (C36) is 100 nanofarads; the thirty-third capacitor (C37) is 10 microfarads; the thirty-second capacitor (C37) is 10 microfarads; The four capacitors (C38) are 100 nanofarads; the thirteenth resistor (R029) is 100 kohms; the fourteenth resistor (R32) is 249 kohms; the first inductance (L1) is 470 nanohenries . 8. The device according to any one of claims 1-7, wherein the wireless data sending device comprises: a chip power supply voltage pin of the data sending chip connected to the third voltage output end and one end of the fifteenth resistor (R20); the fifteenth resistor (R20), the other end is connected to one end of the sixteenth resistor (R19) and the enable pin of the data sending chip; The other end of the sixteenth resistor (R19) is connected to the reset pin of the data sending chip; The seventeenth resistor (R21), one end is connected to the first input pin of the data sending chip, the other end is connected to one end of the eighteenth resistor (R22) and the third voltage output end, the eighteenth resistor The other end of (R22) is connected to the second input pin of the data sending chip; A nineteenth resistor (R23), one end is connected to the third input pin of the data transmission chip, and the other end is connected to the ground pin of the data transmission chip, and is grounded; Both the data receiving pin and the data sending pin of the data sending chip are connected to the single chip microcomputer, and are used for receiving the data sent by the single chip computer; The fifteenth resistor (R20), the seventeenth resistor (R21), the eighteenth resistor (R22), and the nineteenth resistor (R23) are all 1 megohm. 9. The device according to any one of claims 1-7, 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), and the seventh capacitor (C14) , the eighth capacitor (C15) is 10 microfarads; the ninth capacitor (C26) is 4.7 microfarads; the tenth capacitor (C27) is 100 nanofarads; the eleventh capacitor (C23) is 100 nanofarads 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 (C33) is 10 nanofarads; The capacitance (C32) is 1 microfarad; the sixteenth capacitance (C25) is 10 nanofarads; the seventeenth capacitance (C24) is 10 nanofarads; the eighteenth capacitance (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. 10. The device according to any one of claims 1-7, wherein the power transmission and transmission module comprises: The DC input terminal is connected with the thirty-fifth capacitor (C29), the thirty-sixth capacitor (C30), one end of the second inductor (L5), and the voltage input pin and the enabling pin of the voltage regulator; the first Thirty-five capacitors (C29), thirty-sixth capacitors (C30), the other ends are grounded; the ground pins of the voltage stabilizer are grounded; The second inductor (L5), the other end is connected to the thirty-seventh capacitor (C40), one end of the thirty-eighth capacitor (C1), and the first switching node pin and the second switching node tube of the voltage regulator. feet connected The other ends of the thirty-seventh capacitor (C40) and the thirty-eighth capacitor (C1) are connected to one end of the third inductor (L4) and the anode of the second diode (D2); the third inductor (L4), the other end is grounded; the cathode of the second diode (D2) is connected to the twentieth resistor (R6), the thirty-ninth capacitor (C31), the fortieth capacitor (C91), the forty-first One end of the capacitor (C92) is connected with the second pin of the DC to AC module; The other ends of the thirty-ninth capacitor (C31), the fortieth capacitor (C91), and the forty-first capacitor (C92) are grounded; the other end of the twentieth resistor (R6) is connected to the twenty-first One end of the resistor (R60), the twenty-second resistor (R10), and the feedback pin of the voltage regulator are connected; the other end of the twenty-first resistor (R60) is grounded; the twenty-second resistor ( R10), the other end 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 and fourth pins of the DC-to-AC module are both connected to the sending coil; The thirty-fifth capacitor (C29) is 220 microfarads; the thirty-sixth capacitor (C30) is 1 microfarad; the thirty-seventh capacitor (C40) is 10 microfarads; the thirty-sixth capacitor (C40) is 10 microfarads; The eighth capacitor (C1) is 22 microfarads; the thirty-ninth capacitor (C31) is 100 microfarads; the fortieth capacitor (C91) is 100 microfarads; the forty-first capacitor (C92) is 1 microfarad; the twentieth resistor (R6) is 7.15 kohms; the twenty-first resistor (R60) is 1 kohm; the twenty-second resistor (R10) is 4.99 kohms.

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