CN110879113A

CN110879113A - Torque measuring equipment

Info

Publication number: CN110879113A
Application number: CN201911337021.1A
Authority: CN
Inventors: 龙小波; 桂凌云
Original assignee: Beijing Bailian Changtong Technology Co Ltd
Current assignee: Beijing Bailian Changtong Technology Co Ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-03-13

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

Torque measuring equipment

Technical Field

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

Background

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

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

In the known method, the output voltage signal of the measuring bridge is tapped off primarily via slip rings and brushes. The slip ring is generally made of copper, and the brushes are classified into carbon brushes and metal brushes. The process of mechanically extracting the output voltage signal via the slip ring and the brush is time consuming, resulting in a less efficient torque measurement process.

Disclosure of Invention

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

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; the input interface is connected with the receiving coil, is connected with a first pin of the rectifier bridge through a first voltage input pin, and is connected with a second pin of the rectifier bridge through a second voltage input pin; for sending the second alternating voltage to the rectifier bridge; the third pin of the rectifier bridge is connected with the anode of the first diode; the fourth pin of the rectifier bridge is connected with the negative electrode of the first diode; the cathode of the first diode is also connected with one end of a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor and an eighth capacitor; the anode of the first diode is grounded and is connected with the other ends of the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor and the eighth capacitor;

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

the analog-to-digital conversion apparatus includes: the ninth capacitor and the tenth capacitor are connected with the second voltage output end, and the feedback signal positive pin is connected with the strain sensor interface; the other ends of the ninth capacitor and the tenth capacitor are grounded; the power supply positive pin connected with the interface of the strain sensor is grounded; the negative electrode pin of the feedback signal connected with the interface of the strain sensor is connected with one end of the first resistor; the other end of the first resistor is connected with the eleventh capacitor, one end of the twelfth capacitor and a positive differential input pin of the analog-to-digital converter ISL 28533; the other end of the eleventh capacitor is grounded; the other end of the twelfth capacitor is connected with the second resistor, one end of the thirteenth capacitor and a negative differential input pin of the analog-to-digital converter; the other end of the second resistor is connected with the negative electrode of the power supply connected with the interface of the strain sensor; the other end of the thirteenth capacitor is grounded; the negative voltage input grounding pin of the analog-to-digital converter is grounded; one end of a fourteenth capacitor, one end of a fifteenth capacitor, one end of a third resistor, one end of a fourth resistor and a 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 and the fifteenth capacitor are grounded; the other end of the third resistor is connected with one end of a fifth resistor and one end of a sixth resistor; the other end of the fourth resistor is connected with one end of the seventh resistor and one end of the eighth resistor; the other ends of the fifth resistor and the seventh resistor are grounded; the other end of the sixth resistor is connected with a first gain control logic input pin of the analog-to-digital converter; the other end of the eighth resistor 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, and the other end of the sixteenth capacitor is grounded; the single-ended output pin of the analog-to-digital converter is connected with one end of a ninth resistor; the other end of the ninth resistor is connected with one end of a 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 with the single chip microcomputer and used for sending the processed data to the single chip microcomputer; the strain sensor interface is used for sending the voltage difference generated by the strain gauge to the analog-to-digital converter;

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

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

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

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

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

Optionally, the first voltage conversion module includes:

the first voltage input end is connected with the eighteenth capacitor, the nineteenth capacitor, one end of the tenth resistor and a voltage input pin of the converter;

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

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

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

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

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

the tenth resistance is 220 kilo-ohms; the eleventh resistance is 143 kilo-ohms; the twelfth resistance is 33 kilo-ohms; the thirteenth resistance is 8.06 kilo-ohms.

Optionally, the second voltage conversion module includes:

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

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

the noise reduction pin of the voltage stabilizer is connected with one end of a twenty-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 are connected with one end of a fifteenth resistor, a twenty-fifth capacitor, a twenty-sixth capacitor, a twenty-seventh capacitor, a sixteenth resistor and a seventeenth resistor;

the other end of the fifteenth resistor is connected with the other end of the twenty-fifth capacitor, a feedback pin of the voltage stabilizer and one end of an eighteenth resistor; the other ends of the eighteenth resistor, the twenty-sixth capacitor and the twenty-seventh capacitor are all grounded; the other end of the sixteenth resistor is connected with a power good indicator pin of the voltage stabilizer; the other end of the seventeenth resistor is connected with one end of a twenty-eighth capacitor and the second voltage output end; the other end of the twenty-eighth capacitor is grounded;

and the ground pin of the voltage stabilizer is grounded.

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

the fourteenth resistance is 100 kilo-ohms; the fifteenth resistance is 10.5 kilo-ohms; the sixteenth resistance is 20 kilo-ohms; the seventeenth resistor is 1-2 ohms; the eighteenth resistor is 2 kilo ohms.

Optionally, the third voltage conversion module includes:

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

the other ends of the twenty-ninth capacitor and the thirty-eighth capacitor are grounded; the other end of the nineteenth resistor is connected with an enabling pin of the switching regulator;

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

the third voltage output end is connected with one end of the first inductor, one end of the thirty-first capacitor, one end of the thirty-second capacitor and a detection pin of the switching regulator; the other end of the first inductor is connected with a switch pin of the switching regulator; the other ends of the thirty-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 thirtieth capacitor is 100 nanofarads; the thirty-first capacitor is 10 microfarads; the thirty-second capacitance is 100 nanofarads; the nineteenth resistance is 100 kilo-ohms; the twentieth resistance is 249 kilo-ohms; the inductance is 470 nanohenries.

Optionally, the wireless data transmitting apparatus includes:

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

the other end of the twenty-first resistor is connected with one end of a twenty-second resistor and an enabling pin of the data sending chip;

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

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

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

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

the twenty-first resistor, the twenty-third resistor, the twenty-fourth resistor and the twenty-fifth resistor are all 1 megaohm.

Optionally, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, and the eighth capacitor are all 10 microfarads; the ninth capacitor is 100 nanofarads; the tenth capacitance is 4.7 microfarads; the eleventh capacitor is 10 nanofarads; the twelfth capacitor is 1 microfarad; the thirteenth capacitor is 10 nanofarads; the fourteenth capacitance is 4.7 microfarads; the fifteenth capacitance 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 kilo-ohms; the fourth resistance is 100 kilo-ohms; the fifth resistance is 100 kilo-ohms; the sixth resistance is 100 ohms; the seventh resistance is 100 kilo-ohms; the eighth resistor is 100 ohms; the ninth resistance is 100 ohms.

Optionally, the power transmission module includes:

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

the other end of the second inductor is connected with one end of a thirty-fifth capacitor, one end of a thirty-sixth capacitor, 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 and the thirty-sixth capacitor is connected with one end of the third inductor and the anode of the second diode; the other end of the third inductor is grounded; the cathode of the second diode is connected with one end of a twenty-sixth resistor, one end of a thirty-seventh capacitor, one end of a thirty-eighth capacitor, one end of a thirty-ninth capacitor and a second pin of the direct current to alternating current 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 with one end of a twenty-seventh resistor, one end of a twenty-eighth resistor and a feedback pin of the voltage stabilizer; the other end of the twenty-seventh resistor is grounded; the other end of the twenty-eighth resistor is connected with a third pin of the transistor; the second pin of the transistor is grounded;

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

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

the twenty-sixth resistance is 7.15 kilo-ohms; the twenty-seventh resistor is 1 kilo-ohm; the twenty-eighth resistance is 4.99 kilo-ohms.

As can be seen from the above, the torque measuring apparatus according to the embodiment of the present invention includes: the device comprises a wireless power supply device, a voltage conversion device, an analog-to-digital conversion device, a single chip microcomputer and a wireless data transmission device; the wireless power supply device includes: the power transmission module is used for generating a first alternating voltage; the transmitting coil is connected with the power transmission transmitting module and used for receiving the first alternating voltage; a receiving coil arranged in parallel with the transmitting coil for generating a second alternating voltage; the input interface is connected with the receiving coil, is connected with a first pin of the rectifier bridge through a first voltage input pin, and is connected with a second pin of the rectifier bridge through a second voltage input pin; for sending the second alternating voltage to the rectifier bridge; the third pin of the rectifier bridge is connected with the anode of the first diode; the fourth pin of the rectifier bridge is connected with the negative electrode of the first diode; the cathode of the first diode is also connected with one end of a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor and an eighth capacitor; the anode of the first diode is grounded and is connected with the other ends of the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor and the eighth capacitor; the voltage conversion device includes: the device comprises a first voltage conversion module, a second voltage conversion module and a third voltage conversion module; a first voltage input end of the first voltage conversion module is connected with a cathode of the diode; a first voltage output end of the first voltage conversion module is connected with a second voltage input end of the second voltage conversion module and a third voltage input end of the third voltage conversion module; the analog-to-digital conversion apparatus includes: the ninth capacitor and the tenth capacitor are connected with the second voltage output end, and the feedback signal positive pin is connected with the strain sensor interface; the other ends of the ninth capacitor and the tenth capacitor are grounded; the positive pin of the power supply connected with the interface of the strain sensor is grounded; a negative electrode pin of a feedback signal of the strain sensor interface is connected with one end of the first resistor; the other end of the first resistor is connected with the eleventh capacitor, one end of the twelfth capacitor and a positive differential input pin of the analog-to-digital converter ISL 28533; the other end of the eleventh capacitor is grounded; the other end of the twelfth capacitor is connected with the second resistor, one end of the thirteenth capacitor and a negative differential input pin of the analog-to-digital converter; the other end of the second resistor is connected with the negative electrode of the power supply connected with the interface of the strain sensor; the other end of the thirteenth capacitor is grounded; the negative voltage input grounding pin of the analog-to-digital converter is grounded; one end of a fourteenth capacitor, one end of a fifteenth capacitor, one end of a third resistor, one end of a fourth resistor and a positive voltage input pin of the analog-to-digital converter are connected with a third voltage input end; the other ends of the fourteenth capacitor and the fifteenth capacitor are grounded; the other end of the third resistor is connected with one ends of the fifth resistor and the sixth resistor; the other end of the fourth resistor is connected with one end of the seventh resistor and one end of the eighth resistor; the other ends of the fifth resistor and the seventh resistor are grounded; the other end of the sixth resistor is connected with a first gain control logic input pin of the analog-to-digital converter; the other end of the eighth resistor 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, and the other end of the sixteenth capacitor is grounded; the single-ended output pin of the analog-to-digital converter is connected with one end of the ninth resistor; the other end of the ninth resistor is connected with one end of a 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 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; the single chip microcomputer is used for sending data to the wireless data sending device, therefore, voltage signals generated by the strain gauge can be directly led out by connecting the strain sensor interface, the process of leading out the voltage signals is in an electric signal transmission mode, the efficiency is higher compared with a mechanical mode, and the torque measuring efficiency can be improved. In addition, the process of leading out the voltage signal does 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, and the analog-to-digital converter converts the voltage signal generated by the strain gauge into a digital signal to be output, so that the efficiency of torque measurement can be further improved. Compared with the known wired power supply mode, the wireless power supply device can reduce signal fluctuation, thereby improving the accuracy of a torque measurement result. The wireless data transmission device can realize wireless data transmission, and compared with the known mode of carrying out wired data transmission through the conductive slip ring, the wireless data transmission device can reduce signal fluctuation caused by frictional contact of the slip ring, thereby improving the accuracy of a torque measurement result. Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.

The innovation points of the embodiment of the invention comprise:

1. through connecting strain transducer interface, directly draw out the voltage signal that foil gage produced, the process of this drawing out voltage signal is signal transmission mode, compares efficiency higher with mechanical system to can improve torque measurement's efficiency. In addition, the process of leading out the voltage signal does 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, and the analog-to-digital converter converts the voltage signal generated by the strain gauge into a digital signal to be output, so that the efficiency of torque measurement can be further improved. Compared with the known wired power supply mode, the wireless power supply device can reduce signal fluctuation, thereby improving the accuracy of a torque measurement result. The wireless data transmission device can realize wireless data transmission, and compared with the known mode of carrying out wired data transmission through the conductive slip ring, the wireless data transmission device can reduce signal fluctuation caused by frictional contact of the slip ring, thereby improving the accuracy of a torque measurement result.

2. The voltage conversion module can convert voltage values suitable for the working of all devices in the torque measurement equipment, and the normal working of the torque measurement equipment is ensured.

Drawings

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

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

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

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

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

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

FIGS. 6(a) and 6(b) are schematic diagrams showing an effect of actually mounting respective devices in a flywheel-series torque measuring apparatus;

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

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

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

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

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

Detailed Description

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

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

The embodiment of the invention discloses torque measurement equipment which can improve the efficiency of torque measurement.

In the embodiment of the invention, the torque borne by the transmission shaft can be measured by sticking the resistance strain gauge on the transmission shaft. In order to improve the efficiency of torque measurement, a voltage signal generated by the strain gauge can be led out in a non-mechanical manner such as by connecting a strain sensor interface. The power supply can be carried out in a wireless mode, the influence of a wired power supply process on a torque measurement result is reduced, and the accuracy of the torque measurement result is improved. The following provides a detailed description of embodiments of the invention.

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

The wireless power supply 110 may wirelessly supply power to the torque measuring device. After the wireless power feeding device 110 is powered, since the voltage values required by the respective devices in the torque measuring apparatus are different, the voltage generated by the wireless power feeding device 110 can be converted into different voltage values by the voltage converting device 120 to power the corresponding devices. The analog-to-digital conversion device 130 can convert the voltage difference generated by the strain gauge into a digital signal, transmit the digital signal to the wireless data transmitting device 150 through the single chip microcomputer 140, and transmit the digital signal to the signal receiving end through the wireless data transmitting device 150.

Specifically, as shown in fig. 2, the wireless power supply device 110 may include: the power transmission module is used for generating a first alternating voltage; the transmitting coil is connected with the power transmission transmitting module and used for receiving the first alternating voltage; a receiving coil arranged in parallel with the transmitting coil for generating a second alternating voltage; the input interface P3 connected with the receiving coil is connected with a first pin of the rectifier bridge D2 through a first voltage input pin and is connected with a second pin of the rectifier bridge D2 through a second voltage input pin; for sending the second alternating voltage to rectifier bridge D2; a third pin of the rectifier bridge D2 is connected to the anode of the first diode D4; a fourth pin of the rectifier bridge D2 is connected with the negative electrode of the first diode D4; the cathode of the first diode D4 is further connected with one end of a first capacitor C8, a second capacitor C9, a third capacitor C10, a fourth capacitor C11, a fifth capacitor C12, a sixth capacitor C13, a seventh capacitor C14 and an eighth capacitor C15; the positive electrode of the first diode D4 is grounded, and is connected to the other ends of the first capacitor C8, the second capacitor C9, the third capacitor C10, the fourth capacitor C11, the fifth capacitor C12, the sixth capacitor C13, the seventh capacitor C14, and the eighth capacitor C15.

The power transmission transmitting module converts direct current into alternating current to supply power to the transmitting coil, and the receiving coil can generate alternating current according to an electromagnetic theory. The alternating voltage generated by the receiving coil is changed into 35V direct voltage through the rectifier bridge, the diode and each capacitor, and then the power supply can be provided for the torque measuring equipment. The power supply device belongs to a wireless power supply device because the transmitting coil and the receiving coil are in wireless connection.

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

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

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

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

As shown in fig. 3, the analog-to-digital conversion apparatus 130 may include: a ninth capacitor C26 and a tenth capacitor C27 connected to the second voltage output terminal, and a pin 3, namely a positive electrode pin of the feedback signal, connected to the strain sensor interface P2; the other ends of the ninth capacitor C26 and the tenth capacitor C27 are grounded; the pin 4 of the strain sensor interface P2 is connected, namely the power supply positive pin is grounded; the pin 2 connected with the strain sensor interface P2, namely the negative pin of the feedback signal, is connected with one end of a first resistor R15; a first resistor R15, the other end of which is connected to an eleventh capacitor C24, one end of a twelfth capacitor C30, and pin 4 of the analog-to-digital converter ISL28533, i.e., an INA + (positive differential Input) pin; an eleventh capacitor C24, the other end of which is grounded; a twelfth capacitor C30, the other end of which is connected to the second resistor R16, one end of the thirteenth capacitor C31, and pin 5 of the analog-to-digital converter, i.e., the INA- (Negative Differential Input) pin; the other end of the second resistor R16 is connected with a pin 1 of the strain sensor interface P2, namely a negative pin of a power supply; a thirteenth capacitor C31, the other end of which is grounded; pin 7 of the analog-to-digital converter, namely a V- (Negative voltage input ground) pin, is grounded; a fourteenth capacitor C32, a fifteenth capacitor C28, a third resistor R25, one end of a fourth resistor R17, and a pin 14 of the analog-to-digital converter, i.e., a V + (Positive voltage input) pin, which are connected to the third voltage input terminal; 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; a sixth resistor R33, the other end of which is connected to pin 2 of the analog-to-digital converter, i.e. G1(Gain Control Logic Input); an eighth resistor R34, the other end of which is connected to pin 1 of the analog-to-digital converter, i.e., G0(Gain Control Logic Input); a pin 9 of the analog-to-digital converter, i.e., an IN- (Non-Inverting Op Amp Input) pin, a pin 10 of the OUT (Auxiliary Amplifier OUT) pin, and a pin 11 of the REF (Input Reference) pin are connected to one end of a sixteenth capacitor C33, a sixteenth capacitor C33, and the other end is grounded; a pin 12 of the analog-to-digital converter, i.e., an OUTA (Single ended output) pin, is connected to 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 OUTA pin of the analog-to-digital converter is connected to the single chip microcomputer 140 and is used for sending the processed data to the single chip microcomputer 140; and the interface P2 of the strain sensor is used for sending the voltage difference generated by the strain gauge to the analog-to-digital converter.

In the embodiment of the invention, the voltage difference generated by the deformation of the strain gauge can be sent to the analog-to-digital converter ISL28533 through P2, the analog-to-digital converter ISL28533 can also be called as an amplifier, and the amplifier amplifies the signal and then sends the amplified signal to the single chip microcomputer 140 through the OUTA.

ISL28535 is a programmable gain instrument amplifier, has low offset, low noise, low gain error and high CMRR function, and is suitable for high-end precision measurement application. It adopts unique 2-bit and 3-state logic interface design to support 9 kinds of gain setting.

In the embodiment of the present invention, the magnification factor can be 500 or 300 times (i.e. G1 state is 1, G0 is 0 or Z). Specifically, the amplification factor of the amplifier can be configured by changing the voltages of G0 and G1 through the resistances of the resistors R25, R26, R17 and R27 and the connection with the power ground. The chip can operate in the range of-40 degrees to 105 degrees.

The ninth capacitor C26 is 100 nanofarads; the tenth capacitance 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 capacitance C32 is 4.7 microfarads; the fifteenth capacitor C28 is 100 nanofarads; the sixteenth capacitor C33 is 100 picofarads; a seventeenth capacitor C43 of 10 nanofarads;

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

Each capacitor is used for filtering noise waves, the first resistor R15 and the second resistor R16 are used for filtering common mode noise waves, the accuracy of an analog-to-digital conversion result is guaranteed, and the accuracy of a torque measurement result is further improved. The sixth resistor R33 and the eighth resistor R34 function as current limiting.

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

As can be seen from the above, the torque measuring device provided in the embodiments of the present invention can directly extract the voltage signal generated by the strain gauge through the strain sensor interface, and the process of extracting the voltage signal is an electrical signal transmission method, which has higher efficiency compared to a mechanical method, thereby improving the efficiency of torque measurement. In addition, the process of leading out the voltage signal does 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, and the analog-to-digital converter converts the voltage signal generated by the strain gauge into a digital signal to be output, so that the efficiency of torque measurement can be further improved. Compared with the known wired power supply mode, the wireless power supply device can reduce signal fluctuation, thereby improving the accuracy of a torque measurement result. The wireless data transmission device can realize wireless data transmission, and compared with the known mode of carrying out wired data transmission through the conductive slip ring, the wireless data transmission device can reduce signal fluctuation caused by frictional contact of the slip ring, thereby improving the accuracy of a torque measurement result.

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

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

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

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

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

the other ends of the eighteenth capacitor C39 and the nineteenth capacitor C40 are grounded; a tenth resistor R29, the other end of which is connected to one end of the eleventh resistor R2 and pin 4 of the converter, i.e., the EN (enable) pin; pin 2 of the converter, i.e., the MODE/SYNC pin, is grounded; the other end of the eleventh resistor R2 is grounded;

the first Voltage Output end is connected with one end of a pin 6 of the converter, namely a Voltage Output (VOUT) pin, 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 to pin 7, i.e., a Feedback (FB) pin, of the converter and one end of a thirteenth resistor R31; the other end of the thirteenth resistor R31 is grounded;

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

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

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

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

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

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

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

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

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

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

pin 1 and pin 2 of the voltage regulator, namely an OUT (output) pin, are connected with one ends of a 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;

a fifteenth resistor R11, the other end of which is connected to the other end of the twenty-fifth capacitor C19, pin 3 of the regulator, i.e., FB (FeedBack) pin, 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 end; a sixteenth resistor R12, the other end of which is connected to pin 5 of the regulator, namely, PG (power-good indicator); a seventeenth resistor R13, the other end of which is connected to one end of the twenty-eighth capacitor C22 and the second voltage output terminal; a twenty-eighth capacitor C22, the other end of which is grounded;

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

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

The voltage regulator may be TPS7a9001 DSKR. The TPS7A9001DSKR chip is a low noise (4.7 μ VRMS), Low Dropout (LDO) regulator capable of providing 500mA current with maximum dropout of only 100mV to 5V and 200mV to 5.7V. Its output can be regulated by an external resistor of 0.8V to 5.7V. Its input voltage range supports operating voltages as low as 1.4V and as high as 6.5V. It also has an output voltage accuracy (over-line, load and temperature) of 1% and soft start functionality. It is well suited for analog low voltage devices that are power sensitive.

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

The twenty-second capacitor C16, the twenty-third capacitor C17, the twenty-sixth capacitor C20 and the twenty-eighth capacitor C22 are used for filtering, and more accurate and stable voltage is obtained. The smaller the capacitance, the stronger the high-frequency filtering capability, and the larger the capacitance, the stronger the low-frequency filtering capability. The twenty-second capacitor C16 and the twenty-sixth capacitor C20 also have the function of energy storage. The function of the twenty-fifth capacitor C19 is to sharpen the wave.

A fourteenth resistance R9 of 100 kilo-ohms; the fifteenth resistor R11 is 10.5 kohms; a sixteenth resistor R12 of 20 kilo-ohms; a seventeenth resistor R13 of 1-2 ohms; the eighteenth resistor R10 is 2 kilo ohms.

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

a third Voltage Input end, which is connected to one end of a twenty-ninth capacitor C35, one end of a thirty-ninth capacitor C36, one end of a nineteenth resistor R029, and a pin 3 of the switching regulator, i.e., a VIN (Voltage Input) pin;

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

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

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

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

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

The twenty-ninth capacitor C35 is 4.7 microfarads; the thirtieth capacitor C36 is 100 nanofarads; the thirty-first capacitor C37 is 10 microfarads; the thirty-second capacitor C38 is 100 nanofarads. A nineteenth resistor R029 is 100 kilo-ohms; the twentieth resistor R32 is 249 kilo-ohms. The first inductance L1 is 470 nanohenries.

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

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

The voltage conversion module can convert voltage values suitable for the working of all devices in the torque measurement equipment, and the normal working of the torque measurement equipment is ensured.

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

a pin 8 of the data transmitting chip, i.e., a VCC (voltage supply) pin, connected to the third voltage output terminal, and one end of a twenty-first resistor R20;

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

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

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

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

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

the twenty-first resistor R20, the twenty-third resistor R21, the twenty-fourth resistor R22 and the twenty-fifth resistor R23 are all 1 megaohm.

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

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

Pins

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

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

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

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

the other ends of the thirty-fifth capacitor C40 and the thirty-sixth capacitor C1 are connected with one end of a third inductor L4 and the anode of a second diode D2; a third inductor L4, the other end of which is grounded; the cathode of the second diode D2 is connected with one end of a twenty-sixth resistor R6, a thirty-seventh capacitor C31, a thirty-eighth capacitor C91, one end of a thirty-ninth capacitor C92 and a second pin of the DC-AC module;

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

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

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

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

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

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

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

Claims

1. A torque 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;

2. The apparatus of claim 1,

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

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

the first voltage input end is connected with 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 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;

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.