CN110879113A - 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 strain sensor interface is connected with a second voltage output end of the second voltage conversion module; the interface connected with the strain sensor is connected with an analog-to-digital converter ISL 28533; the single-ended output pin of the analog-to-digital converter is connected with the single chip microcomputer and used for sending the processed data to the single chip microcomputer; 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 efficiency of torque measurement can be improved.

Description

A torque measuring device

technical field

The present 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. The process of extracting the output voltage signal by mechanical means such as slip rings and brushes is relatively time-consuming, resulting in low efficiency of the torque measurement process.

SUMMARY OF THE INVENTION

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

A torque measuring device, characterized in that it 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 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 ninth capacitor and a tenth capacitor connected to the second voltage output terminal, and a positive pin of the feedback signal connected to the interface of the strain sensor; the ninth capacitor and the tenth capacitor, and the other end of the are grounded; the power supply positive pin connected to the strain sensor interface is grounded; the feedback signal negative pin connected to the strain sensor interface is connected to one end of the first resistor; the other end of the first resistor is connected to the eleventh capacitor, One end of the twelfth capacitor is connected to the positive differential input pin of the analog-to-digital converter ISL28533; the other end of the eleventh capacitor is grounded; the other end of the twelfth capacitor is connected to one end of the second resistor and the thirteenth capacitor. , and the negative differential input pin of the analog-to-digital converter; the other end of the second resistor is connected to the negative pole of the power supply connected to the interface of the strain sensor; the thirteenth capacitor, the other end is grounded; the analog The negative voltage input ground pin of the digital converter is grounded; the fourteenth capacitor, the fifteenth capacitor, the third resistor, and one end of the fourth resistor connected to the third voltage input terminal, and the positive terminal of the analog-to-digital converter Voltage input pin; the other ends of the fourteenth capacitor and the fifteenth capacitor are grounded; the other end of the third resistor is connected to one end of the fifth resistor and the sixth resistor; the other end of the fourth resistor is connected to The seventh resistor and the eighth resistor are connected at one end; the fifth resistor and the seventh resistor are grounded at the other end; the sixth resistor is connected at the other end with the first gain control logic input pin of the analog-to-digital converter ; The eighth resistor, the other end is connected with the second gain control logic input pin of the analog-to-digital converter; the non-inverting operational amplifier input pin of the analog-to-digital converter, the auxiliary amplifier output pin, and The output reference pins are all connected to one end of the sixteenth capacitor, and the other end of the sixteenth capacitor is grounded; the single-ended output pin of the analog-to-digital converter is connected to one end of the ninth resistor; the ninth resistor , the other end is connected to one end of the seventeenth capacitor, and the other end of the seventeenth capacitor is grounded; the single-ended output pin of the analog-to-digital converter is connected to the single-chip microcomputer for processing the data sent to the single-chip microcomputer; the connection to the strain sensor interface is used to send the voltage difference generated by the strain gauge to the analog-to-digital converter;

The single-chip microcomputer is used 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 eighteenth capacitor, the nineteenth capacitor, the tenth resistor, and the voltage input pin of the converter;

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

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

The other ends of the twentieth capacitor and the twenty-first capacitor are both grounded; the other end of the twelfth resistor is connected to the feedback pin of the converter and one end of the thirteenth resistor; the other end of the thirteenth resistor is connected to the ground. One end is grounded;

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

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

The tenth resistance is 220 kiloohms; the eleventh resistance is 143 kiloohms; the twelfth resistance is 33 kiloohms; and the thirteenth resistance is 8.06 kiloohms.

Optionally, the second voltage conversion module includes:

The second voltage input end, one end of the twenty-second capacitor, the twenty-third capacitor, the fourteenth resistor, and the first voltage input pin, the second voltage input pin of the voltage regulator, and the soft-start control pins are connected;

The other end of the twenty-second capacitor and the twenty-third capacitor is grounded; the other end of the fourteenth resistor is connected to the enabling pin of the voltage regulator;

The noise reduction pin of the voltage stabilizer is connected to one end of the twenty-fourth capacitor; the other end of the twenty-fourth capacitor is grounded;

The first output pin and the second output pin of the voltage stabilizer, and the fifteenth resistor, the twenty-fifth capacitor, the twenty-sixth capacitor, the twenty-seventh capacitor, the sixteenth resistor, the seventeenth One end of the resistor is connected;

The other end of the fifteenth resistor is connected to the other end of the twenty-fifth capacitor, the feedback pin of the voltage regulator, and one end of the eighteenth resistor; the eighteenth resistor, the twenty-sixth resistor The other end of the capacitor and the twenty-seventh capacitor are grounded; the other end of the sixteenth resistor is connected to the power good indicator pin of the voltage stabilizer; the other end of the seventeenth resistor is connected to the twentieth One end of the eighth capacitor is connected to the second voltage output end; the other end of the twenty-eighth capacitor is grounded;

The ground pin of the voltage regulator is grounded.

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

The fourteenth resistance is 100 kiloohms; the fifteenth resistance is 10.5 kiloohms; the sixteenth resistance is 20 kiloohms; the seventeenth resistance is 1-2 ohms; the eighteenth resistance The resistance is 2 kohms.

Optionally, the third voltage conversion module includes:

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

The other ends of the twenty-ninth capacitor and the thirtieth capacitor are grounded; the other end of the nineteenth 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 twentieth resistor; the other end of the twentieth resistor is grounded;

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

the ground pin of the switching regulator is grounded;

The twenty-ninth capacitor is 4.7 microfarads; the thirty-first capacitor is 100 nanofarads; the thirty-first capacitor is 10 microfarads; the thirty-second capacitor is 100 nanofarads; The nineteenth resistance is 100 kiloohms; the twentieth resistance is 249 kiloohms; the 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 twenty-first resistor;

The twenty-first resistor, the other end is connected to one end of the twenty-second resistor and the enable pin of the data sending chip;

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

The twenty-third 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 twenty-fourth resistor and the third voltage output end, the other end of the twenty-fourth resistor is connected connected with the second input pin of the data sending chip;

A twenty-fifth 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 twenty-first resistor, the twenty-third resistor, the twenty-fourth resistor, and the twenty-fifth 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 100 nanofarad; the tenth capacitance is 4.7 microfarads; the eleventh capacitance is 10 nanofarads; the twelfth capacitance is 1 microfarad; the thirteenth capacitance is 10 nanofarads; the tenth capacitance is 10 nanofarads; The fourth capacitor is 4.7 microfarads; the fifteenth capacitor is 100 nanofarads; the sixteenth capacitor is 100 picofarads; the seventeenth capacitor is 10 nanofarads;

The first resistance is 100 ohms; the second resistance is 100 ohms; the third resistance is 100 kiloohms; the fourth resistance is 100 kiloohms; the fifth resistance is 100 kiloohms; the The sixth resistance is 100 ohms; the seventh resistance is 100 kohms; the eighth resistance is 100 ohms; the ninth resistance is 100 ohms.

Optionally, the power transmission and transmission module includes:

The DC input terminal is connected to the thirty-third capacitor, the thirty-fourth capacitor, one end of the second inductor, and the voltage input pin and the enabling pin of the voltage stabilizer; the thirty-third capacitor, the thirty-fourth 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-fifth capacitor, one end of the thirty-sixth capacitor, and the first switch node pin and the second switch node pin of the voltage regulator;

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

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

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-third capacitor is 220 microfarads; the thirty-fourth capacitor is 1 microfarad; the thirty-fifth capacitor is 10 microfarads; the thirty-sixth capacitor is 22 microfarads; the The thirty-seventh capacitor is 100 microfarads; the thirty-eighth capacitor is 100 microfarads; the thirty-ninth capacitor is 1 microfarad;

The twenty-sixth resistor is 7.15 kΩ; the twenty-seventh resistor is 1 kΩ; and the twenty-eighth resistor is 4.99 kΩ.

It can be seen from the above that the torque measuring device provided by the embodiment of the present invention includes: a wireless power supply device, a voltage conversion device, an analog-to-digital conversion device, a single-chip microcomputer, and a wireless data transmission device; the wireless power supply device includes: a power transmission 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: a ninth capacitor and a tenth capacitor connected to the second voltage output end, and a positive pin of the feedback signal connected to the interface of the strain sensor; the other ends of the ninth capacitor and the tenth capacitor are grounded; and the power supply of the interface of the strain sensor is connected The positive pin is grounded; the negative pin of the feedback signal of the strain sensor interface is connected to one end of the first resistor; the other end of the first resistor is connected to the eleventh capacitor, one end of the twelfth capacitor, and the positive differential of the analog-to-digital converter ISL28533 The input pin is connected; the eleventh capacitor, the other end is grounded; the twelfth capacitor, the other end is connected with the second resistor, one end of the thirteenth capacitor, and the negative differential input pin of the analog-to-digital converter; the second resistor, the other One end is connected to the negative pole of the power supply connected to the interface of the strain sensor; the thirteenth capacitor, the other end is grounded; the negative voltage input ground pin of the analog-to-digital converter is grounded; the fourteenth capacitor and the fifteenth capacitor connected to the third voltage input end , one end of the third resistor, the fourth resistor, and the positive voltage input pin of the analog-to-digital converter; the fourteenth capacitor, the fifteenth capacitor, the other ends are grounded; the third resistor, the other end is connected to the fifth resistor, the sixth One end of the resistor is connected to one end; the other end of the fourth resistor is connected to one end of the seventh resistor and the eighth resistor; the other end of the fifth resistor and the seventh resistor is grounded; the sixth resistor, the other end is connected to the first gain control of the analog-to-digital converter the logic input pin is connected; the eighth resistor, the other end of which is connected with the second gain control logic input pin of the analog-to-digital converter; the non-inverting operational amplifier input pin of the analog-to-digital converter, the auxiliary amplifier output pin, and the output pin Reference pins, all connected to one end of the sixteenth capacitor , the sixteenth capacitor, the other end is grounded; the single-ended output pin of the analog-to-digital converter is connected to one end of the ninth resistor; the other end of the ninth resistor is connected to one end of the seventeenth capacitor, and the other end of the seventeenth capacitor is grounded ; The single-ended output pin of the analog-to-digital converter is connected to the single-chip microcomputer to send the processed data to the single-chip microcomputer; it is connected to the strain sensor interface to send the voltage difference generated by the strain gauge to the analog-to-digital converter; the single-chip microcomputer, It is used to send 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. The process of extracting the voltage signal is an electrical signal transmission method, which is more efficient than the mechanical method. , which can improve the efficiency of torque measurement. Moreover, the process of extracting the voltage signal will not cause any signal fluctuation, so that the accuracy of the torque measurement result can be improved. The analog-to-digital converter ISL28533 has a high calculation rate. The analog-to-digital converter converts the voltage signal generated by the strain gauge into a digital signal output, which can further improve the efficiency of torque measurement. By supplying power to the torque measuring device through the wireless power supply device, compared with the known wired power supply method, the signal fluctuation can be reduced, 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 is an electrical signal transmission method, which is more efficient than the mechanical method, thereby improving the efficiency of torque measurement. Moreover, the process of extracting the voltage signal will not cause any signal fluctuation, so that the accuracy of the torque measurement result can be improved. The analog-to-digital converter ISL28533 has a high calculation rate. The analog-to-digital converter converts the voltage signal generated by the strain gauge into a digital signal output, which can further improve the efficiency of torque measurement. By supplying power to the torque measuring device through the wireless power supply device, compared with the known wired power supply method, the signal fluctuation can be reduced, 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 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 device;

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 measuring device, which can improve the efficiency of torque measurement.

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 improve the efficiency of torque measurement, the voltage signal generated by the strain gauge can be drawn out in a non-mechanical way by connecting to the strain sensor interface. The power supply can also be carried out in a wireless manner, so as to reduce the influence of the wired power supply process on the torque measurement result and improve the accuracy of the torque measurement result. The 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 measuring device may include: a wireless power supply device 110 , a voltage conversion device 120 , an analog-to-digital conversion device 130 , a microcontroller 140 , and a wireless data transmission device 150 .

The wireless power supply 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 equipment 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 a rectifier bridge, diodes and various capacitors, which can supply power to the torque measuring device. 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: a ninth capacitor C26, a tenth capacitor C27 connected to the second voltage output terminal, and a pin 3 connected to the strain sensor interface P2, that is, the positive pin of the feedback signal; The other ends of the ninth capacitor C26 and the tenth capacitor C27 are grounded; connected to the pin 4 of the strain sensor interface P2, that is, the positive power supply pin is grounded; connected to the pin 2 of the strain sensor interface P2, that is, the negative pin of the feedback signal, and One end of the first resistor R15 is connected to one end; the other end of the first resistor R15 is connected to one end of the eleventh capacitor C24, one end of the twelfth capacitor C30, and the pin 4 of the analog-to-digital converter ISL28533, namely the INA+ (Positive Differential Input, positive differential input) tube The pins are connected; the eleventh capacitor C24, the other end is grounded; the twelfth capacitor C30, the other end is connected to the second resistor R16, one end of the thirteenth capacitor C31, and the pin 5 of the analog-to-digital converter, namely INA-(Negative Differential Input, negative differential input) pin is connected; the other end of the second resistor R16 is connected to the pin 1 of the strain sensor interface P2, that is, the negative pin of the power supply; the thirteenth capacitor C31, the other end is grounded; Pin 7, namely V- (Negative supply, negative voltage input ground) pin, grounded; the fourteenth capacitor C32, the fifteenth capacitor C28, the third resistor R25, and the fourth resistor R17 connected to the third voltage input terminal One end is connected to the pin 14 of the analog-to-digital converter, that is, the V+ (Positive supply, positive voltage input) pin; the fourteenth capacitor C32 and the fifteenth capacitor C28, the other ends are grounded; the third resistor R25, the other end One end of the fifth resistor R26 and the sixth resistor R33 are connected; the other end of the fourth resistor R17 is connected to one end of the seventh resistor R27 and the eighth resistor R34; the other ends of the fifth resistor R26 and the seventh resistor R27 are grounded; The other end of the resistor R33 is connected to the pin 2 of the analog-to-digital converter, that is, the G1 (Gain Control Logic Input, gain control logic input) pin; the eighth resistor R34, the other end is connected to the pin 1 of the analog-to-digital converter, that is G0 (Gain Control Logic Input, gain control logic input) pin is connected; pin 9 of the analog-to-digital converter, namely IN- (Non-Inverting Op Amp Input, non-inverting operational amplifier input) pin, pin 10, That is, the OUT (Auxiliary Amplifier OUT, auxiliary amplifier output) pin and pin 11, that is, the REF (INA Output Reference, output reference) pin, are connected to one end of the sixteenth capacitor C33, and the other end of the sixteenth capacitor C33. Ground; pin 12 of the analog-to-digital converter, namely OUTA (Single EndedOutput, single-ended output OUT) pin, which is connected to one end of the ninth resistor R28; the other end of the ninth resistor R28 is connected to one end of the seventeenth capacitor C43, and the other end of the seventeenth capacitor C43 is grounded; the OUTA pin of the analog-to-digital converter is connected to the microcontroller 140 is connected to send the processed data to the single chip microcomputer 140; connected to the strain sensor interface P2, 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 ISL28533 through P2, and the analog-to-digital converter ISL28533 can also be called an amplifier.

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

In this embodiment of the present invention, the magnification can be selected as 500 or 300 times (ie, the state of G1 is 1, and the state of G0 is 0 or Z). Specifically, the amplification factor can be configured by changing the voltages of G0 and G1 through the resistance values of the resistors R25, R26, R17, and R27, and by connecting with the power supply ground to configure the amplification factor of the amplifier. The chip can work in the range of minus 40 degrees to 105 degrees.

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

The first resistor R15 is 100 ohms; the second resistor R16 is 100 ohms; the third resistor R25 is 100 k ohms; the fourth resistor R17 is 100 k ohms; the fifth resistor R26 is 100 k ohms; the sixth resistor R33 is 100 ohms ohm; the seventh resistor R27 is 100 kiloohms; the eighth resistor R34 is 100 ohms; the ninth resistor R28 is 100 ohms.

The function of each capacitor is to filter out clutter, and the function of the first resistor R15 and the second resistor R16 is to filter common mode clutter to ensure the accuracy of the analog-to-digital conversion result, thereby improving the accuracy of the torque measurement result. The functions of the sixth resistor R33 and the eighth resistor R34 are current limiting.

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 that the torque measuring device provided by the embodiment of the present invention can directly extract the voltage signal generated by the strain gauge by connecting the strain sensor interface. The process of extracting the voltage signal is an electrical signal transmission method, which is more efficient than the mechanical method. higher, which can improve the efficiency of torque measurement. Moreover, the process of extracting the voltage signal will not cause any signal fluctuation, so that the accuracy of the torque measurement result can be improved. The analog-to-digital converter ISL28533 has a high calculation rate. The analog-to-digital converter converts the voltage signal generated by the strain gauge into a digital signal output, which can further improve the efficiency of torque measurement. By supplying power to the torque measuring device through the wireless power supply device, compared with the known wired power supply method, the signal fluctuation can be reduced, 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 one end of the eighteenth capacitor C39, the nineteenth capacitor C40, the tenth resistor R29, and the pin 3 of the converter, that is, the VIN (Voltage Input, voltage input) pin;

The other ends of the eighteenth capacitor C39 and the nineteenth capacitor C40 are both grounded; the other end of the tenth resistor R29 is connected to one end of the eleventh resistor R2 and the pin 4 of the converter, namely the EN (enable) pin ; Pin 2 of the converter, that is, the MODE/SYNC (mode/synchronization) pin is grounded; the other end of the eleventh 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 twelfth resistor R30, the twentieth capacitor C41, and one end of the twenty-first capacitor C42;

The other ends of the twentieth capacitor C41 and the twenty-first capacitor C42 are both grounded; the other end of the twelfth resistor R30 is connected to the pin 7 of the converter, namely the FB (Feedback, feedback) pin, and one end of the thirteenth resistor R31 ;The other end of the thirteenth 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 eighteenth capacitor C39 is 10 microfarads; the nineteenth capacitor C40 is 100 nanofarads; the twentieth capacitor C41 is 22 microfarads; and the twenty-first capacitor C42 is 100 nanofarads.

The functions of the eighteenth capacitor C39, the nineteenth capacitor C40, the twentieth capacitor C41, and the twenty-first 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 eighteenth capacitor C39 and the twentieth capacitor C41 also function as energy storage.

The tenth resistor R29 is 220 kΩ; the eleventh resistor R2 is 143 kΩ; the twelfth resistor R30 is 33 kΩ; the thirteenth resistor R31 is 8.06 kΩ.

The voltage of the FB pin is 1V, so the twelfth resistor R30 and the thirteenth 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-second capacitor C16, the twenty-third capacitor C17, one end of the fourteenth resistor R9, and the pin 10 of the voltage regulator, that is, the VIN (Input, voltage input) pin, pin 9, that is, the VIN pin, and the pin 6, that is, the SS_CTRL (soft start control) pin is connected;

The other end of the twenty-second capacitor C16 and the twenty-third capacitor C17 is grounded; the other end of the fourteenth resistor R9 is connected to the pin 7 of the 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-fourth capacitor C18; the other end of the twenty-fourth capacitor C18 is grounded;

The pin 1 and pin 2 of the regulator, that is, the OUT (output) pin, are connected with the fifteenth resistor R11, the twenty-fifth capacitor C19, the twenty-sixth capacitor C20, the twenty-seventh capacitor C21, the tenth One end of the sixth resistor R12 and the seventeenth resistor R13 are connected;

The other end of the fifteenth resistor R11 is connected to the other end of the twenty-fifth capacitor C19, the pin 3 of the regulator, namely the FB (FeedBack, feedback) pin, and one end of the eighteenth resistor R10; the eighteenth resistor R10, The other end of the twenty-sixth capacitor C20 and the twenty-seventh capacitor C21 are grounded; the other end of the sixteenth resistor R12 is connected to the pin 5 of the voltage regulator, that is, the PG (power-good, power good indicator) pin connected; the other end of the seventeenth resistor R13 is connected to one end of the twenty-eighth capacitor C22 and the second voltage output end; the other end of the twenty-eighth 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-second capacitor C16 is 10 microfarads; the twenty-third capacitor C17 is 100 nanofarads; the twenty-fourth capacitor C18 is 100 nanofarads; the twenty-fifth capacitor C19 is 10 nanofarads; the twenty-sixth capacitor C19 is 10 nanofarads; C20 is 10 microfarads; the twenty-seventh capacitor C21 is 100 nanofarads; the twenty-eighth capacitor C22 is 100 nanofarads.

The functions of the twenty-second capacitor C16, the twenty-third capacitor C17, the twenty-sixth capacitor C20, and the twenty-eighth capacitor C22 are to filter 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-second capacitor C16 and the twenty-sixth capacitor C20 also function as energy storage. The function of the twenty-fifth capacitor C19 is to sharpen the wave.

The fourteenth resistor R9 is 100kΩ; the fifteenth resistor R11 is 10.5kΩ; the sixteenth resistor R12 is 20kΩ; the seventeenth resistor R13 is 1-2Ω; the eighteenth 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 twenty-ninth capacitor C35, the thirtieth capacitor C36, one end of the nineteenth resistor R029, and the pin 3 of the switching regulator, that is, the VIN (Voltage Input, voltage input) pin;

The other ends of the twenty-ninth capacitor C35 and the thirtieth capacitor C36 are grounded; the other end of the nineteenth resistor R029 is connected to the pin 6 of the switching regulator, that is, the EN (enable) pin;

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

The third voltage output terminal is connected to the first inductor L1, one end of the thirty-first capacitor C37, the thirty-second 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-first capacitor C37, the thirty-second 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 twenty-ninth capacitor C35 is 4.7 microfarads; the thirtieth capacitor C36 is 100 nanofarads; the thirty-first capacitor C37 is 10 microfarads; and the thirty-second capacitor C38 is 100 nanofarads. The nineteenth resistor R029 is 100 kΩ; the twentieth resistor R32 is 249 kΩ. The first inductance L1 is 470 nanohenries.

The function of the nineteenth 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 twenty-ninth capacitor C35, the thirtieth capacitor C36, the thirty-first capacitor C37, and the thirty-second 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 twenty-ninth capacitor C35 and the thirty-first capacitor C37 also function as energy storage.

Through the voltage conversion module, a voltage value suitable for the work of each device in the torque measuring device can be converted 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 twenty-first resistor R20;

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

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

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

The twenty-fifth resistor R23 has one end connected to the pin 10 of the data transmission chip, namely the third input pin (IO15), and the other end is connected to the pin 9 of the data transmission chip, that is, the GND (Ground, ground) pin, and 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 twenty-first resistor R20, the twenty-third resistor R21, the twenty-fourth resistor R22, and the twenty-fifth 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 terminal is connected with the thirty-third capacitor C29, the thirty-fourth capacitor C30, one end of the second inductor L5, and the pin 4 of the voltage regulator, that is, the VIN (Voltage Input, voltage input) pin, and the pin 2 , that is, the EN (enable, enable) pin is connected; the thirty-third capacitor C29, the thirty-fourth capacitor C30, the other end is grounded; the ground pin of the voltage stabilizer is grounded;

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

The other ends of the thirty-fifth capacitor C40 and the thirty-sixth capacitor C1 are 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 Connect to one end of the twenty-sixth resistor R6, the thirty-seventh capacitor C31, the thirty-eighth capacitor C91, the thirty-ninth capacitor C92, and the second pin of the DC-AC module;

The other ends of the thirty-seventh capacitor C31, the thirty-eighth capacitor C91, and the thirty-ninth capacitor C92 are grounded; the other end of the twenty-sixth resistor R6 is connected to one end of the twenty-seventh resistor R60 and the twenty-eighth resistor R10. , and the pin 5 of the regulator, that is, the FB (FeedBack, feedback) pin is connected; the twenty-seventh resistor R60, the other end is grounded; the twenty-eighth resistor R10, the other end is connected to the third pin of the transistor Q2; 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-third capacitor C29 is 220 microfarads; the thirty-fourth capacitor C30 is 1 microfarad; the thirty-fifth capacitor C40 is 10 microfarads; the thirty-sixth capacitor C1 is 22 microfarads; the thirty-seventh capacitor C1 is 22 microfarads; C31 is 100 microfarads; the thirty-eighth capacitor C91 is 100 microfarads; the thirty-ninth capacitor C92 is 1 microfarad; the twenty-sixth resistor R6 is 7.15 kΩ; the twenty-seventh resistor R60 is 1 kΩ; The twenty-eighth resistor R10 is 4.99 kΩ.

The functions of the third inductor L4, the second inductor L5, and the thirty-sixth capacitor C1 are energy storage. The functions of the twenty-sixth resistor R6, the twenty-seventh resistor R60, the twenty-eighth 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 apparatus, 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: a ninth capacitor (C26), a tenth capacitor (C27) and a feedback signal positive pin connected with a strain sensor interface (P2) are connected with the second voltage output end; the other ends of the ninth capacitor (C26) and the tenth capacitor (C27) are grounded; the power supply positive pin of the strain sensor interface (P2) is grounded; the negative pin of the feedback signal of the strain sensor interface (P2) is connected with one end of a first resistor (R15); the other end of the first resistor (R15) is connected with an eleventh capacitor (C24), one end of a twelfth capacitor (C30) and a positive differential input pin of an analog-to-digital converter ISL 28533; the eleventh capacitor (C24), the other end is grounded; the other end of the twelfth capacitor (C30) is connected with the second resistor (R16), one end of the thirteenth capacitor (C31) and a negative differential input pin of the analog-to-digital converter; the other end of the second resistor (R16) is connected with the negative electrode of the power supply of the strain sensor interface (P2); the thirteenth capacitor (C31) has the other end grounded; the negative voltage input grounding pin of the analog-to-digital converter is grounded; a fourteenth capacitor (C32), a fifteenth capacitor (C28), a third resistor (R25), one end of a fourth resistor (R17) and a positive voltage input pin of the analog-to-digital converter, wherein the fourteenth capacitor (C32), the fifteenth capacitor (C28), the third resistor (R25) and the positive voltage input pin of the analog-to-digital converter are connected with the third voltage input end; the other ends of the fourteenth capacitor (C32) and the fifteenth capacitor (C28) are grounded; the other end of the third resistor (R25) is connected with one ends of a fifth resistor (R26) and a sixth resistor (R33); the other end of the fourth resistor (R17) is connected with one ends of a seventh resistor (R27) and an eighth resistor (R34); the other ends of the fifth resistor (R26) and the seventh resistor (R27) are grounded; the other end of the sixth resistor (R33) is connected with a first gain control logic input pin of the analog-to-digital converter; the other end of the eighth resistor (R34) is connected with a second gain control logic input pin of the analog-to-digital converter; the non-inverting operational amplifier input pin, the auxiliary amplifier output pin and the output reference pin of the analog-to-digital converter are all connected with one end of a sixteenth capacitor (C33), and the other end of the sixteenth capacitor (C33) is grounded; the single-ended output pin of the analog-to-digital converter is connected with one end of a ninth resistor (R28); the other end of the ninth resistor (R28) is connected with one end of a seventeenth capacitor (C43), and the other end of the seventeenth capacitor (C43) is grounded; the single-ended output pin of the analog-to-digital converter is connected with the single chip microcomputer and used for sending the processed data to the single chip microcomputer; the strain sensor interface (P2) 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.

2. The apparatus of claim 1,

the negative pole of the first diode (D4) has the voltage of 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.

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

the first voltage input end is connected with an eighteenth capacitor (C39), a nineteenth capacitor (C40), one end of a tenth resistor (R29) and a voltage input pin of the converter;

the other ends of the eighteenth capacitor (C39) and the nineteenth capacitor (C40) are grounded; the other end of the tenth resistor (R29) is connected with one end of an eleventh resistor (R2) and an enabling pin of the converter; the mode/sync pin of the converter is grounded; the other end of the eleventh resistor (R2) is grounded;

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

the other ends of the twentieth capacitor (C41) and the twenty-first capacitor (C42) are grounded; the other end of the twelfth resistor (R30) is connected with a feedback pin of the converter and one end of a thirteenth resistor (R31); the other end of the thirteenth resistor (R31) is grounded;

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

4. The apparatus of claim 3,

the eighteenth capacitor (C39) is 10 microfarads; the nineteenth capacitor (C40) is 100 nanofarads; the twentieth capacitance (C41) is 22 microfarads; the twenty-first capacitance (C42) is 100 nanofarads;

the tenth resistance (R29) is 220 kilo-ohms; the eleventh resistance (R2) is 143 kilo-ohms; the twelfth resistance (R30) is 33 kilo-ohms; the thirteenth 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-second capacitor (C16), one end of a twenty-third capacitor (C17) and one end of a fourteenth resistor (R9), a first voltage input pin, a second voltage input pin and a soft start control pin of the voltage stabilizer;

the other ends of the twenty-second capacitor (C16) and the twenty-third capacitor (C17) are grounded; the fourteenth resistor (R9) is connected with the other end of the voltage stabilizer through an enabling pin;

the noise reduction pin of the voltage stabilizer is connected with one end of a twenty-fourth capacitor (C18); the twenty-fourth capacitor (C18), the other end of which is grounded;

the first output pin and the second output pin of the voltage stabilizer are connected with one end of a fifteenth resistor (R11), a twenty-fifth capacitor (C19), a twenty-sixth capacitor (C20), a twenty-seventh capacitor (C21), a sixteenth resistor (R12) and a seventeenth resistor (R13);

the other end of the fifteenth resistor (R11) is connected with the other end of the twenty-fifth capacitor (C19), a feedback pin of the voltage stabilizer and one end of an eighteenth resistor (R10); the eighteenth resistor (R10), the twenty-sixth capacitor (C20) and the twenty-seventh capacitor (C21) are all grounded at the other ends; the sixteenth resistor (R12) is connected with the other end of the sixteenth resistor (R12) and the power good indicator pin of the voltage stabilizer; the other end of the seventeenth resistor (R13) is connected with one end of a twenty-eighth capacitor (C22) and the second voltage output end; the twenty-eighth capacitor (C22), the other end of which is grounded;

and the ground pin of the voltage stabilizer is grounded.

6. The apparatus of claim 5,

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

the fourteenth resistance (R9) is 100 kilo-ohms; the fifteenth resistance (R11) is 10.5 kilo-ohms; the sixteenth resistance (R12) is 20 kilo-ohms; the seventeenth resistor (R13) is 1-2 ohms; the eighteenth 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 twenty-ninth capacitor (C35), a thirty-ninth capacitor (C36), one end of a nineteenth resistor (R029) and a voltage input pin of the switching regulator;

the other ends of the twenty-ninth capacitor (C35) and the thirty-fifth capacitor (C36) are grounded; the nineteenth resistor (R029) is connected with the other end of the switch voltage stabilizer through an enable pin;

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

the third voltage output end is connected with one end of a first inductor (L1), one end of a thirty-first capacitor (C37), one end of a thirty-second 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-first capacitor (C37) and the thirty-second capacitor (C38) are grounded;

the ground pin of the switching regulator is grounded;

the twenty-ninth capacitance (C35) is 4.7 microfarads; the thirtieth capacitor (C36) is 100 nanofarads; the thirty-first capacitance (C37) is 10 microfarads; the thirty-second capacitance (C38) is 100 nanofarads; said nineteenth resistance (R029) is 100 kilo-ohms; the twentieth resistance (R32) is 249 kilo-ohms; the 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 transmitting chip connected to the third voltage output terminal and one end of a twenty-first resistor (R20);

the other end of the twenty-first resistor (R20) is connected with one end of a twenty-second resistor (R19) and an enabling pin of the data transmitting chip;

the other end of the twenty-second resistor (R19) is connected with a reset pin of the data sending chip;

a twenty-third resistor (R21) having one end connected to the first input pin of the data transmitting chip and the other end connected to one end of a twenty-fourth resistor (R22) and the third voltage output terminal, the other end of the twenty-fourth resistor (R22) being connected to the second input pin of the data transmitting chip;

a twenty-fifth 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 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;

the twenty-first resistor (R20), the twenty-third resistor (R21), the twenty-fourth resistor (R22) and the twenty-fifth 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 capacitor (C26) is 100 nanofarads; the tenth capacitance (C27) is 4.7 microfarads; the eleventh capacitance (C24) is 10 nanofarads; the twelfth capacitor (C30) is 1 microfarad; the thirteenth capacitor (C31) is 10 nanofarads; the fourteenth capacitance (C32) is 4.7 microfarads; the fifteenth capacitance (C28) is 100 nanofarads; the sixteenth capacitor (C33) is 100 picofarads; the seventeenth capacitor (C43) is 10 nanofarads;

the first resistance (R15) is 100 ohms; the second resistance (R16) is 100 ohms; the third resistance (R25) is 100 kilo-ohms; the fourth resistance (R17) is 100 kilo-ohms; the fifth resistance (R26) is 100 kilo-ohms; the sixth resistance (R33) is 100 ohms; the seventh resistance (R27) is 100 kilo-ohms; the eighth resistance (R34) is 100 ohms; the ninth resistance (R28) 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-third capacitor (C29), one end of a thirty-fourth capacitor (C30), one end of a second inductor (L5), and a voltage input pin and an enabling pin of the voltage stabilizer; the thirty-third capacitor (C29) and the thirty-fourth 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-fifth capacitor (C40), one end of a thirty-sixth 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-fifth capacitor (C40) and the thirty-sixth 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 one end of a twenty-sixth resistor (R6), one end of a thirty-seventh capacitor (C31), one end of a thirty-eighth capacitor (C91), one end of a thirty-ninth capacitor (C92) and a second pin of the direct current-to-alternating current module;

the thirty-seventh capacitor (C31), the thirty-eighth capacitor (C91) and the thirty-ninth capacitor (C92) are all grounded at the other end; the other end of the twenty-sixth resistor (R6) is connected with one end of a twenty-seventh resistor (R60), one end of a twenty-eighth resistor (R10) and a feedback pin of the voltage stabilizer; the twenty-seventh resistor (R60) is grounded at the other end; the twenty-eighth resistor (R10) is connected with the third pin of the transistor (Q2) at the other end; the transistor (Q2), the second pin 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-third capacitance (C29) is 220 microfarads; the thirty-fourth capacitance (C30) is 1 microfarad; the thirty-fifth capacitance (C40) is 10 microfarads; the thirty-sixth capacitance (C1) is 22 microfarads; the thirty-seventh capacitance (C31) is 100 microfarads; the thirty-eighth capacitance (C91) is 100 microfarads; the thirty ninth capacitance (C92) is 1 microfarad;

the twenty-sixth resistance (R6) is 7.15 kilo-ohms; the twenty-seventh resistance (R60) is 1 kilo-ohm; the twenty-eighth resistance (R10) is 4.99 kilo-ohms.

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