CN110880936B - Analog-to-digital conversion device for torque measurement equipment - Google Patents
Analog-to-digital conversion device for torque measurement equipment Download PDFInfo
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- CN110880936B CN110880936B CN201911337038.7A CN201911337038A CN110880936B CN 110880936 B CN110880936 B CN 110880936B CN 201911337038 A CN201911337038 A CN 201911337038A CN 110880936 B CN110880936 B CN 110880936B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 84
- 238000005259 measurement Methods 0.000 title claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims abstract description 246
- 239000003381 stabilizer Substances 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 10
- 238000001914 filtration Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/16—Rotary-absorption dynamometers, e.g. of brake type
- G01L3/22—Rotary-absorption dynamometers, e.g. of brake type electrically or magnetically actuated
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Abstract
The embodiment of the invention discloses an analog-to-digital conversion device for torque measuring equipment, which comprises: the first voltage input end is connected with a first voltage input pin of the analog-to-digital converter, the first capacitor, the second capacitor, one end of the third capacitor, a feedback signal positive electrode connected with the strain sensor interface and a positive reference input pin of the analog-to-digital converter; the second voltage input end is connected with one end of a second voltage input pin, a fourth capacitor and a fifth capacitor of the analog-to-digital converter; the power supply positive electrode pin connected with the strain sensor interface is connected with one end of the sixth capacitor, the first resistor and the seventh capacitor, the negative reference input pin of the analog-to-digital converter and the bridging low voltage conversion to ground pin; a feedback signal negative electrode pin connected with a strain sensor interface is connected with one end of a second resistor; a tenth capacitor, the other end of which is connected with one end of the third resistor; the other end of the third resistor is connected with a power supply negative electrode pin connected with the strain sensor interface; the embodiment of the invention can improve the accuracy of torque measurement.
Description
Technical Field
The invention relates to the technical field of data processing, in particular to an analog-to-digital conversion device for torque measuring equipment.
Background
With the development of the domestic automobile industry, new automobile types are endlessly layered, and automobile bench and road tests are more and more important. Modern engines require increased rotational speed to improve mechanical performance and efficiency, while torque is an important indicator of motor and engine performance, thus requiring high accuracy, high reliability torque measurements.
The existing torque measurement method mainly comprises a transmission measurement method of a resistance strain gauge. The torque can lead the product to be tested to generate certain strain, and the proportional relation exists between the strain and the torque, so that the corresponding torque can be detected through the resistance strain gauge which can generate torsional deformation. When the product to be tested is subjected to torque, the maximum strain is generated in the direction forming an angle of 45 degrees with the axis, so that the resistance strain gauge is stuck in the direction, and the torque applied to the transmission shaft can be detected.
In the known method, the output voltage signal of the measuring bridge is led out mainly by slip rings and brushes. Slip rings are typically made of copper and brushes are divided into carbon brushes and metal brushes. Since the voltage signal output by the measuring bridge is very weak, in order to ensure the accuracy of the output signal, the contact resistance between the slip ring and the brush is required to be very stable. In practical applications, the contact resistance between the slip ring and the brush is unreliable, which causes signal fluctuations, resulting in inaccurate torque measurements.
Disclosure of Invention
The invention provides an analog-to-digital conversion device for torque measurement equipment, which is used for improving the accuracy of a torque measurement result. The specific technical scheme is as follows.
An analog-to-digital conversion apparatus for a torque measurement device, comprising:
The first voltage input end is connected with a first voltage input pin of the AD7190, one end of the first capacitor, one end of the second capacitor and one end of the third capacitor, a feedback signal positive electrode pin connected with the strain sensor interface and a positive reference input pin of the AD 7190;
The other ends of the first capacitor, the second capacitor and the third capacitor are grounded;
the second voltage input end is connected with one end of a second voltage input pin, one end of a fourth capacitor and one end of a fifth capacitor of the analog-to-digital converter; the other ends of the fourth capacitor and the fifth capacitor are grounded;
The power supply positive electrode pin connected with the strain sensor interface is connected with one end of a sixth capacitor, a first resistor and a seventh capacitor, and a negative reference input pin of the analog-to-digital converter and a bridging low voltage conversion to ground pin;
The other ends of the sixth capacitor and the first resistor are grounded; the other end of the seventh capacitor is connected with one end of the eighth capacitor and the positive reference input pin of the analog-to-digital converter; the other end of the eighth capacitor is grounded;
the feedback signal negative electrode pin connected with the strain sensor interface is connected with one end of the second resistor; the other end of the second resistor is connected with one end of the ninth capacitor and one end of the tenth capacitor and a first analog input pin of the analog-to-digital converter;
The other end of the ninth capacitor is grounded; the other end of the tenth capacitor is connected with the third resistor, one end of the eleventh capacitor and a second analog input pin of the analog-to-digital converter; the other end of the third resistor is connected with a power supply negative electrode pin connected with the strain sensor interface; the other end of the eleventh capacitor is grounded;
The strain sensor interface is used for sending the voltage difference generated by the strain gauge to the analog-to-digital converter.
Optionally, the method further comprises:
a first voltage conversion device, a second voltage conversion device, and a third voltage conversion device;
The first voltage output end of the first voltage conversion device is connected with the third voltage input end of the second voltage conversion device and the fourth voltage input end of the third voltage conversion device, the second voltage output end of the second voltage conversion device is connected with the first voltage input end, and the third voltage output end of the third voltage conversion device is connected with the second voltage input end;
the voltage of the third voltage input end of the first voltage conversion device is 35V, the voltage of the first voltage output end is 5.1V, the voltage of the second voltage output end is 5V, and the voltage of the third voltage output end is 3.3V.
Optionally, the first voltage conversion device includes:
The third voltage input end is connected with one end of the twelfth capacitor, one end of the thirteenth capacitor and one end of the fourth resistor and a voltage input pin of the converter;
The other ends of the twelfth capacitor and the thirteenth capacitor are grounded; the other end of the fourth resistor is connected with one end of the fifth resistor and an enabling pin of the converter; the mode/sync pin of the converter is grounded; the other end of the fifth resistor is grounded;
the first voltage output end is connected with one end of a voltage output pin, a sixth resistor, a fourteenth capacitor and a fifteenth capacitor of the converter;
The other ends of the fourteenth capacitor and the fifteenth capacitor are grounded; the other end of the sixth resistor is connected with a feedback pin of the converter and one end of the seventh resistor; the other end of the seventh resistor is grounded;
The ground pin and the heat conducting pad pin of the converter are grounded.
Optionally, the twelfth capacitance is 10 microfarads; the thirteenth capacitance is 100 nanofarads; the fourteenth capacitor is 22 microfarads; the fifteenth capacitor is 100 nanofarads;
The fourth resistor is 220 kiloohms; the fifth resistor is 143 kilo ohms; the sixth resistance is 33 kiloohms; the seventh resistance is 8.06 kilo-ohms.
Optionally, the second voltage conversion device includes:
The third voltage input end is connected with one end of the sixteenth capacitor, one end of the seventeenth capacitor and one end of the eighth resistor, the first voltage input pin, the second voltage input pin and the soft start control pin of the voltage stabilizer;
The sixteenth capacitor and the seventeenth capacitor are grounded at the other end; the other end of the eighth resistor is connected with an enabling pin of the voltage stabilizer;
The noise reduction pin of the voltage stabilizer is connected with one end of the eighteenth capacitor; the other end of the eighteenth capacitor is grounded;
The first output pin and the second output pin of the voltage stabilizer are connected with one end of a ninth resistor, a nineteenth capacitor, a twentieth capacitor, a twenty first capacitor, a tenth resistor and an eleventh resistor;
The other end of the ninth resistor is connected with the other end of the nineteenth capacitor, the feedback pin of the voltage stabilizer and one end of the twelfth resistor; the twelfth resistor, the twentieth capacitor and the twenty-first capacitor are grounded at the other ends; the tenth resistor is connected with the power supply good indicator pin of the voltage stabilizer at the other end; the other end of the eleventh resistor is connected with one end of the twenty-second capacitor and the second voltage output end; the other end of the twenty-second capacitor is grounded;
The ground pin of the voltage stabilizer is grounded.
Optionally, the sixteenth capacitance is 10 microfarads; the seventeenth capacitance is 100 nanofarads; the eighteenth capacitance is 100 nano-farads; the nineteenth capacitance is 10 nanofarads; the twentieth capacitance is 10 microfarads; the twenty-first capacitance is 100 nanofarads; the twenty-second capacitance is 100 nanofarads;
The eighth resistor is 100 kilo ohms; the ninth resistance is 10.5 kilo ohms; the tenth resistor is 20 kiloohms; the eleventh resistor is 1-2 ohms; the twelfth resistor is 2 kilo ohms.
Optionally, the third voltage conversion device includes:
the fourth voltage input end is connected with one end of the twenty-third capacitor, one end of the twenty-fourth capacitor and one end of the thirteenth resistor and a voltage input pin of the switching regulator;
The other ends of the twenty-third capacitor and the twenty-fourth capacitor are grounded; the thirteenth resistor is connected with the enabling pin of the switching regulator at the other end;
The voltage selection pin of the switching regulator is connected with one end of a fourteenth resistor; the other end of the fourteenth resistor is grounded;
The second voltage output end is connected with one end of the inductor, one end of the twenty-fifth capacitor and one end of the twenty-sixth capacitor and a detection pin of the switching regulator; the other end of the inductor is connected with a switch pin of the switching regulator; the other ends of the twenty-fifth capacitor and the twenty-sixth capacitor are grounded;
the ground pin of the switching regulator is grounded.
Optionally, the twenty-third capacitance is 4.7 microfarads; the twenty-fourth capacitance is 100 nanofarads; the twenty-fifth capacitance is 10 microfarads; the twenty-sixth capacitance is 100 nanofarads;
The thirteenth resistance is 100 kilo ohms; the fourteenth resistor is 249 kilo ohms;
the inductance is 470 nanohenry.
Optionally, the first capacitance is 4.7 microfarads; the second capacitance is 100 nanofarads; the third capacitance is 100 nanofarads; the fourth capacitance is 4.7 microfarads; the fifth capacitance is 100 nanofarads; the sixth capacitance is 10 nanofarads; the seventh capacitance is 1 microfarad; the eighth capacitance is 10 nanofarads; the ninth capacitance is 10 nanofarads; the tenth capacitance is 1 microfarad; the eleventh capacitance is 10 nanofarads.
Optionally, the second resistor is 100 ohms; the third resistance is 100 ohms.
As can be seen from the foregoing, the analog-to-digital conversion apparatus for a torque measurement device according to the embodiment of the present invention may include: the first voltage input end is connected with a first voltage input pin of the AD7190, one end of the first capacitor, one end of the second capacitor and one end of the third capacitor, a feedback signal positive electrode pin connected with the strain sensor interface and a positive reference input pin of the AD 7190; the other ends of the first capacitor, the second capacitor and the third capacitor are grounded; the second voltage input end is connected with one end of a second voltage input pin, one end of a fourth capacitor and one end of a fifth capacitor of the analog-to-digital converter; the other ends of the fourth capacitor and the fifth capacitor are grounded; the power supply positive electrode pin connected with the strain sensor interface is connected with one end of a sixth capacitor, a first resistor and a seventh capacitor, and a negative reference input pin of the analog-to-digital converter and a bridging low voltage conversion to ground pin; the other ends of the sixth capacitor and the first resistor are grounded; the other end of the seventh capacitor is connected with one end of the eighth capacitor and the positive reference input pin of the analog-to-digital converter; the other end of the eighth capacitor is grounded; the feedback signal negative electrode pin connected with the strain sensor interface is connected with one end of the second resistor; the other end of the second resistor is connected with one end of the ninth capacitor and one end of the tenth capacitor and a first analog input pin of the analog-to-digital converter; the other end of the ninth capacitor is grounded; the other end of the tenth capacitor is connected with the third resistor, one end of the eleventh capacitor and a second analog input pin of the analog-to-digital converter; the other end of the third resistor is connected with a power supply negative electrode pin connected with the strain sensor interface; the other end of the eleventh capacitor is grounded; the strain sensor interface is used for sending the voltage difference generated by the strain gauge to the analog-to-digital converter, so that the voltage signal generated by the strain gauge can be directly led out through the strain sensor interface, and the voltage signal leading-out process can not cause any signal fluctuation, so that the accuracy of a torque measurement result can be improved. In addition, the analog-to-digital converter AD7190 has higher calculation accuracy, and the accuracy of the finally obtained torque measurement result can be further improved by converting the voltage signal generated by the strain gauge into a digital signal and outputting the digital signal through the analog-to-digital converter. Of course, it is not necessary for any one product or method of practicing the invention to achieve all of the advantages set forth above at the same time.
The innovation points of the embodiment of the invention include:
1. The voltage signal generated by the strain gauge is directly led out through the strain sensor interface, and the voltage signal leading-out process can not cause any signal fluctuation, so that the accuracy of a torque measurement result can be improved. In addition, the analog-to-digital converter AD7190 has higher calculation accuracy, and the accuracy of the finally obtained torque measurement result can be further improved by converting the voltage signal generated by the strain gauge into a digital signal and outputting the digital signal through the analog-to-digital converter.
2. The voltage value suitable for the operation of the analog-to-digital conversion device can be obtained through conversion of the voltage conversion device, and the normal operation of the analog-to-digital conversion device 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 apparent that the drawings in the following description are only some embodiments of the invention. Other figures may be derived from these figures without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of an analog-to-digital conversion apparatus for a torque measurement device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a voltage conversion device according to an embodiment of the invention;
FIG. 3 is a schematic diagram of another voltage converting apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another voltage conversion device according to an embodiment of the invention.
Detailed Description
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. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "comprising" and "having" and any variations thereof in the embodiments of the present invention and the accompanying drawings are intended to cover non-exclusive inclusions. A process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those 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 an analog-to-digital conversion device for torque measurement equipment, which can improve the accuracy of a torque measurement result.
In the embodiment of the invention, in order to avoid signal fluctuation caused when the voltage signal of the strain gauge is led out through the slip ring and the electric brush, the voltage signal of the strain gauge can be led out in a non-mechanical mode. Specifically, the voltage signal of the strain gauge can be led out through a strain sensor interface, so that signal fluctuation can be avoided, and the accuracy of a torque measurement result is improved. The following describes embodiments of the present invention in detail.
Fig. 1 is a schematic structural diagram of an analog-to-digital conversion device for a torque measurement apparatus according to an embodiment of the present invention. The analog-to-digital conversion apparatus for a torque measurement device may include:
the first voltage input end is connected with a pin 20 of the analog-to-digital converter AD7190, namely a first voltage input pin, a first capacitor C26, a second capacitor C27, a third capacitor C23 end, a pin 3 connected with the strain sensor interface P2, namely a feedback signal positive pin, and a pin 15 of the analog-to-digital converter, namely a REFIN1 (+) (REFERENCE INPUT, positive reference input) pin;
the other ends of the first capacitor C26, the second capacitor C27 and the third capacitor C23 are grounded;
The second voltage input end is connected with one end of a pin 21 of the analog-to-digital converter, namely a second voltage input pin, a fourth capacitor C28 and a fifth capacitor C29; the other ends of the fourth capacitor C28 and the fifth capacitor C29 are grounded;
Pin 4, the supply positive pin, of the strain sensor interface P2 is connected to the sixth capacitor C33, the first resistor R17, one end of the seventh capacitor C32, and pin 16 of the analog-to-digital converter, the REFIN1 (-) (REFERENCE INPUT, negative reference input) pin, pin 17, the BPDSW (Bridge Power-Down Switch to AGND, bridge Low Voltage to ground) pin;
The other ends of the sixth capacitor C33 and the first resistor R17 are grounded; a seventh capacitor C32, the other end of which is connected to one end of the eighth capacitor C25 and to pin 15 of the analog-to-digital converter, i.e. the REFIN1 (+) (REFERENCE INPUT, positive reference input) pin; an eighth capacitor C25, the other end of which is grounded;
Pin 2 connected with the strain sensor interface P2, namely a feedback signal negative electrode pin, is connected with one end of a second resistor R15; a second resistor R15, the other end of which is connected to a ninth capacitor C24, one end of a tenth capacitor C30, and a pin 13 of the Analog-to-digital converter, i.e., an AIN3 (Analog Input) pin;
A ninth capacitor C24, the other end of which is grounded; a tenth capacitor C30, the other end of which is connected to the third resistor R16, one end of the eleventh capacitor C31, and the pin 14 of the analog-to-digital converter, i.e., AIN4 pin; the other end of the third resistor R16 is connected with a pin 1 connected with the strain sensor interface P2, namely a power supply negative electrode pin; an eleventh capacitor C31, the other end of which is grounded;
the strain sensor interface P2 is connected to send 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 deformation of the strain gauge can be sent to the analog-to-digital converter AD7190 through P2, the analog-to-digital converter AD7190 can also be called an amplifier, and the signal is amplified by the amplifier and then sent to the singlechip. The singlechip sends commands to the G1 and G0 ports of the amplifier through the SPI to control the amplification factor of the amplifier.
AD7190 is a low-noise amplifier capable of completely simulating the front end, and is suitable for high-end precise measurement application. The AD7190 also has a zero delay function, which outputs data at a rate ranging from 4.7Hz to 4.8kHz. The chip may operate in the range of-40 degrees to 105 degrees.
When pin AIN3 is used with pin AIN4, pin AIN3 may be configured as the positive input of the fully differential input pair and pin AIN4 may be configured as the negative input of the fully differential input pair.
The first capacitance C26 is 4.7 microfarads; the second capacitor C27 is 100 nanofarads; the third capacitor C23 is 100 nanofarads; the fourth capacitance C28 is 4.7 microfarads; the fifth capacitor C29 is 100 nanofarads; the sixth capacitance C33 is 10 nanofarads; the seventh capacitance C32 is 1 microfarad; the eighth capacitor C25 is 10 nanofarads; the ninth capacitor C24 is 10 nanofarads; the tenth capacitance C30 is 1 microfarad; the eleventh capacitance C31 is 10 nanofarads.
The second resistor R15 is 100 ohms; the third resistor R16 is 100 ohms.
The effect of each capacitor is to filter clutter, the effect of the second resistor R15 and the third resistor R16 is to filter common mode clutter, the accuracy of the analog-to-digital conversion result is guaranteed, and the accuracy of the torque measurement result is further improved.
As can be seen from the foregoing, the analog-to-digital conversion apparatus for a torque measurement device according to the embodiment of the present invention may include: the first voltage input end is connected with a first voltage input pin of the AD7190, one end of the first capacitor, one end of the second capacitor and one end of the third capacitor, a feedback signal positive electrode pin connected with the strain sensor interface and a positive reference input pin of the AD 7190; the other ends of the first capacitor, the second capacitor and the third capacitor are grounded; the second voltage input end is connected with one end of a second voltage input pin, one end of a fourth capacitor and one end of a fifth capacitor of the analog-to-digital converter; the other ends of the fourth capacitor and the fifth capacitor are grounded; the power supply positive electrode pin connected with the strain sensor interface is connected with one end of a sixth capacitor, a first resistor and a seventh capacitor, and a negative reference input pin of the analog-to-digital converter and a bridging low voltage conversion to ground pin; the other ends of the sixth capacitor and the first resistor are grounded; the other end of the seventh capacitor is connected with one end of the eighth capacitor and the positive reference input pin of the analog-to-digital converter; the other end of the eighth capacitor is grounded; the feedback signal negative electrode pin connected with the strain sensor interface is connected with one end of the second resistor; the other end of the second resistor is connected with one end of the ninth capacitor and one end of the tenth capacitor and a first analog input pin of the analog-to-digital converter; the other end of the ninth capacitor is grounded; the other end of the tenth capacitor is connected with the third resistor, one end of the eleventh capacitor and a second analog input pin of the analog-to-digital converter; the other end of the third resistor is connected with a power supply negative electrode pin connected with the strain sensor interface; the other end of the eleventh capacitor is grounded; the strain sensor interface is used for sending the voltage difference generated by the strain gauge to the analog-to-digital converter, so that the voltage signal generated by the strain gauge can be directly led out through the strain sensor interface, and the voltage signal leading-out process can not cause any signal fluctuation, so that the accuracy of a torque measurement result can be improved. In addition, the analog-to-digital converter AD7190 has higher calculation accuracy, and the accuracy of the finally obtained torque measurement result can be further improved by converting the voltage signal generated by the strain gauge into a digital signal and outputting the digital signal through the analog-to-digital converter.
As an implementation manner of the embodiment of the present invention, the above analog-to-digital conversion apparatus may further include: a first voltage conversion device, a second voltage conversion device, and a third voltage conversion device.
The first voltage output end of the first voltage conversion device is connected with the third voltage input end of the second voltage conversion device and the fourth voltage input end of the third voltage conversion device, the second voltage output end of the second voltage conversion device is connected with the first voltage input end, and the third voltage output end of the third voltage conversion device is connected with the second voltage input end. The third voltage input end voltage of the first voltage conversion device is 35V, the first voltage output end voltage is 5.1V, the second voltage output end voltage is 5V, and the third voltage output end voltage is 3.3V.
That is, the first voltage conversion device and the second voltage conversion device may be sequentially connected to obtain a voltage value satisfying the first voltage input terminal of the analog-to-digital conversion device through the first voltage conversion device and the second voltage conversion device; the first voltage conversion device is connected with the third voltage conversion device so as to obtain the voltage value meeting the second voltage input end of the analog-to-digital conversion device through the first voltage conversion device and the third voltage conversion device.
In one implementation, as shown in fig. 2, the first voltage conversion device includes:
A third Voltage Input terminal connected to a twelfth capacitor C39, a thirteenth capacitor C40, one end of a fourth resistor R29, and a pin 3 of the converter, i.e., a VIN (Voltage Input) pin;
the other ends of the twelfth capacitor C39 and the thirteenth capacitor C40 are grounded; a fourth resistor R29, the other end of which is connected to one end of the fifth resistor R2 and to pin 4 of the converter, i.e., EN (enable) pin; pin 2 of the converter, the MODE/SYNC pin, is grounded; the other end of the fifth resistor R2 is grounded;
the first Voltage Output end is connected with one end of a pin 6 of the converter, namely a VOUT (Voltage Output) pin, a sixth resistor R30, a fourteenth capacitor C41 and a fifteenth capacitor C42;
The other ends of the fourteenth capacitor C41 and the fifteenth capacitor C42 are grounded; the other end of the sixth resistor R30 is connected with the pin 7 of the converter, namely the FB (Feedback) pin and one end of the seventh resistor R31; the other end of the seventh resistor R31 is grounded;
pin 1 of the converter, i.e., the GND (Ground) pin, and pin 11, i.e., the PAD (THERMAL PAD) pin, are grounded.
The converter may be LMZM23601SILR. The 35V voltage is converted to a voltage of 5.1V by a non-isolated DC/DC converter LMZM23601SILR. The chip LMZM23601SILR has a wide operating input voltage of 1.4V to 36V and an output voltage of 2.5V to 15V which is adjustable.
Wherein the twelfth capacitance C39 is 10 microfarads; the thirteenth capacitance C40 is 100 nanofarads; the fourteenth capacitance C41 is 22 microfarads; the fifteenth capacitor C42 is 100 nanofarads.
The twelfth capacitor C39, the thirteenth capacitor C40, the fourteenth capacitor C41 and the fifteenth capacitor C42 function as filtering to obtain more accurate and stable voltages. The smaller the capacitance, the stronger the high frequency filtering capability, and the larger the capacitance, the stronger the low frequency filtering capability. The twelfth capacitor C39 and the fourteenth capacitor C41 also have the function of energy storage.
The fourth resistor R29 is 220 kilo-ohms; the fifth resistor R2 is 143 kilo ohms; the sixth resistor R30 is 33 kilo ohms; the seventh resistor R31 is 8.06 kilo-ohms.
Since the FB pin voltage is 1V, a voltage of 5.1V can be output by the sixth resistor R30 and the seventh resistor R31. The enable voltage of LMZM23601SILR chip is 1.8V, and the external voltage divider is added to set the input voltage of the voltage stabilizer to start voltage conversion.
In one implementation, as shown in fig. 3, the second voltage conversion device includes:
The third voltage Input terminal is connected to the sixteenth capacitor C16, the seventeenth capacitor C17, one end of the eighth resistor R9, and the pin 10 of the voltage regulator, i.e., the VIN (Input) pin, the pin 9, i.e., the VIN pin, and the pin 6, i.e., the ss_ctrl (soft start control) pin;
a sixteenth capacitor C16 and a seventeenth capacitor C17, the other ends of which are grounded; an eighth resistor R9, the other end of which is connected with a pin 7 of the voltage stabilizer, namely an EN (enable) pin;
pin 8 of the voltage stabilizer, namely NR/SS (noise reduction) pin, is connected with one end of an eighteenth capacitor C18; an eighteenth capacitor C18, the other end of which is grounded;
pin 1 and pin 2 of the voltage stabilizer, namely OUT (output) pin, are connected with one end of a ninth resistor R11, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty first capacitor C21, a tenth resistor R12 and an eleventh resistor R13;
the other end of the ninth resistor R11 is connected with the other end of the nineteenth capacitor C19 and one end of a pin 3 of the voltage stabilizer, namely a Feedback (FB) pin and a twelfth resistor R10; the twelfth resistor R10, the twentieth capacitor C20 and the twenty-first capacitor C21 are grounded at the other ends; a tenth resistor R12, the other end of which is connected with pin 5 of the voltage regulator, i.e., pin PG (power-good indicator); an eleventh resistor R13, the other end of which is connected with one end of a twenty-second capacitor C22 and a second voltage output end; a twenty-second capacitor C22, the other end of which is grounded;
the pin 4 of the voltage regulator, i.e. the GND (Ground) pin, is grounded.
FB pin for setting the output voltage of the device. PG pin, which is used for drain open circuit of LDO output voltage. The ss_ctrl pin is connected to GND or IN to modify the NR/SS capacitor charging current. NR/SS pin, which is connected to an external capacitor to reduce noise generated by the internal bandgap 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 stabilizer may be TPS7a9001DSKR. The TPS7A9001DSKR chip is a low noise (4.7 μVRMS), low Dropout (LDO) regulator capable of providing 500mA current with a maximum voltage differential 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 1% output voltage accuracy (extra line, load and temperature) and soft start functions. It is well suited for power sensitive analog low voltage devices.
The sixteenth capacitor C16 is 10 microfarads; seventeenth capacitance C17 is 100 nanofarads; the eighteenth capacitor C18 is 100 nanofarads; nineteenth capacitance C19 is 10 nanofarads; the twentieth capacitance C20 is 10 microfarads; the twenty-first capacitor C21 is 100 nanofarads; the twenty-second capacitance C22 is 100 nanofarads.
The sixteenth capacitor C16, the seventeenth capacitor C17, the twentieth capacitor C20 and the twenty second capacitor C22 function as filtering to obtain more accurate and stable voltages. The smaller the capacitance, the stronger the high frequency filtering capability, and the larger the capacitance, the stronger the low frequency filtering capability. The sixteenth capacitor C16 and the twentieth capacitor C20 also have the function of energy storage. The nineteenth capacitor C19 functions as a sharpening wave.
The eighth resistor R9 is 100 kilo-ohms; the ninth resistor R11 is 10.5 kilo-ohms; the tenth resistor R12 is 20 kilo ohms; the eleventh resistor R13 is 1-2 ohms; the twelfth resistor R10 is 2 kilo-ohms.
In one implementation, as shown in fig. 4, the third voltage conversion device includes:
a fourth Voltage Input terminal connected to the twenty-third capacitor C35, the twenty-fourth capacitor C36, one terminal of the thirteenth resistor R029, and pin 3 of the switching regulator, i.e., the VIN (Voltage Input) pin;
The other ends of the twenty-third capacitor C35 and the twenty-fourth capacitor C36 are grounded; a thirteenth resistor R029, the other end of which is connected with pin 6 of the switching regulator, namely an EN (enable) pin;
Pin 5 of the switching regulator, namely the VSEL/MODE pin, is connected with one end of a fourteenth resistor R32; the other end of the fourteenth resistor R32 is grounded;
The second voltage output end is connected with one end of an inductor L1, a twenty-fifth capacitor C37 and a twenty-sixth capacitor C38 and a pin 2 of the switching regulator, namely a VOS (detection) pin; the other end of the inductor L1 is connected with a pin 4 of the switching regulator, namely a SW (switch) pin; the other ends of the twenty-fifth capacitor C37 and the twenty-sixth capacitor C38 are grounded;
Pin 1 of the switching regulator, i.e., GND (Ground) pin, is grounded.
The switching regulator may be TPS62802YKAR. The 5.1V voltage is converted to a 3.3V voltage by switching regulator TPS62802YKAR to power the analog to digital converter. The VOS pin is an output voltage detection pin of the internal feedback voltage divider network and the regulation loop.
The twenty-third capacitance C35 is 4.7 microfarads; the twenty-fourth capacitance C36 is 100 nanofarads; the twenty-fifth capacitance C37 is 10 microfarads; the twenty-sixth capacitance C38 is 100 nanofarads. Thirteenth resistor R029 is 100 kohms; the fourteenth resistor R32 is 249 kilo ohms. Inductance L1 is 470 nanohenry.
The thirteenth resistor R029 acts as a current limiter to ensure that the chip is not burned out. The inductor L1 functions as an energy storage.
The twenty-third capacitor C35, the twenty-fourth capacitor C36, the twenty-fifth capacitor C37 and the twenty-sixth capacitor C38 all have the functions of filtering, so that 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 more the low frequency filtering capability. The twenty-third capacitor C35 and the twenty-fifth capacitor C37 also have the function of energy storage.
The voltage value suitable for the wireless data transmission device to work can be obtained through conversion of the voltage conversion device, and the wireless data transmission device is ensured to work normally.
Those of ordinary skill in the art will appreciate that: the drawing is a schematic diagram of one embodiment and the modules or flows in the drawing are not necessarily required to practice the invention.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An analog-to-digital conversion apparatus for a torque measurement device, comprising:
The first voltage input end is connected with a first voltage input pin of the analog-to-digital converter AD7190, a first capacitor (C26), a second capacitor (C27), one end of a third capacitor (C23), a feedback signal positive electrode pin connected with the strain sensor interface (P2) and a positive reference input pin of the analog-to-digital converter;
the first capacitor (C26), the second capacitor (C27) and the third capacitor (C23) are grounded at the other ends;
A second voltage input end connected with one end of a second voltage input pin, a fourth capacitor (C28) and a fifth capacitor (C29) of the analog-to-digital converter; the other ends of the fourth capacitor (C28) and the fifth capacitor (C29) are grounded;
The power supply positive electrode pin of the strain sensor interface (P2) is connected with one end of a sixth capacitor (C33), a first resistor (R17) and a seventh capacitor (C32), and the negative reference input pin of the analog-to-digital converter is connected with the bridging low voltage conversion to the ground pin;
The other ends of the sixth capacitor (C33) and the first resistor (R17) are grounded; the other end of the seventh capacitor (C32) is connected with one end of the eighth capacitor (C25) and the positive reference input pin of the analog-to-digital converter; the eighth capacitor (C25) is grounded at the other end;
The feedback signal negative electrode pin connected with the strain sensor interface (P2) is connected with one end of a second resistor (R15); the second resistor (R15) is connected with one end of a ninth capacitor (C24), one end of a tenth capacitor (C30) and a first analog input pin of the analog-to-digital converter at the other end;
The ninth capacitor (C24) is grounded at the other end; the tenth capacitor (C30) is connected with one end of the third resistor (R16), one end of the eleventh capacitor (C31) and a second analog input pin of the analog-to-digital converter; the other end of the third resistor (R16) is connected with a power supply negative electrode pin of the strain sensor interface (P2); the eleventh capacitor (C31) is grounded at the other end;
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 analog-to-digital conversion apparatus according to claim 1, further comprising:
a first voltage conversion device, a second voltage conversion device, and a third voltage conversion device;
The first voltage output end of the first voltage conversion device is connected with the third voltage input end of the second voltage conversion device and the fourth voltage input end of the third voltage conversion device, the second voltage output end of the second voltage conversion device is connected with the first voltage input end, and the third voltage output end of the third voltage conversion device is connected with the second voltage input end;
the voltage of the third voltage input end of the first voltage conversion device is 35V, the voltage of the first voltage output end is 5.1V, the voltage of the second voltage output end is 5V, and the voltage of the third voltage output end is 3.3V.
3. The analog-to-digital conversion apparatus according to claim 2, wherein the first voltage conversion apparatus comprises:
The third voltage input end is connected with one end of a twelfth capacitor (C39), a thirteenth capacitor (C40) and a fourth resistor (R29) and a voltage input pin of the converter;
the other ends of the twelfth capacitor (C39) and the thirteenth capacitor (C40) are grounded; the other end of the fourth resistor (R29) is connected with one end of the fifth resistor (R2) and an enabling pin of the converter; the mode/sync pin of the converter is grounded; the other end of the fifth resistor (R2) is grounded;
The first voltage output end is connected with one end of a voltage output pin, a sixth resistor (R30), a fourteenth capacitor (C41) and a fifteenth capacitor (C42) of the converter;
The other ends of the fourteenth capacitor (C41) and the fifteenth capacitor (C42) are grounded; the other end of the sixth resistor (R30) is connected with a feedback pin of the converter and one end of a seventh resistor (R31); the other end of the seventh resistor (R31) is grounded;
The ground pin and the heat conducting pad pin of the converter are grounded.
4. An analog to digital conversion apparatus according to claim 3, wherein,
The twelfth capacitance (C39) is 10 microfarads; the thirteenth capacitance (C40) is 100 nanofarads; the fourteenth capacitance (C41) is 22 microfarads; the fifteenth capacitor (C42) is 100 nanofarads;
the fourth resistance (R29) is 220 kilo-ohms; -said fifth resistance (R2) is 143 kilo-ohms; -said sixth resistance (R30) is 33 kilo-ohms; the seventh resistor (R31) is 8.06 kilo-ohms.
5. The analog-to-digital conversion apparatus according to claim 2, wherein the second voltage conversion apparatus comprises:
The third voltage input end is connected with one end of a sixteenth capacitor (C16), a seventeenth capacitor (C17), an eighth resistor (R9), a first voltage input pin, a second voltage input pin and a soft start control pin of the voltage stabilizer;
the sixteenth capacitor (C16) and the seventeenth capacitor (C17) are connected with the other end of the capacitor to the ground; the eighth resistor (R9) is connected with an enabling pin of the voltage stabilizer at the other end;
The noise reduction pin of the voltage stabilizer is connected with one end of an eighteenth capacitor (C18); the eighteenth 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 ninth resistor (R11), a nineteenth capacitor (C19), a twentieth capacitor (C20), a twenty first capacitor (C21), a tenth resistor (R12) and an eleventh resistor (R13);
The other end of the ninth resistor (R11) is connected with the other end of the nineteenth capacitor (C19), the feedback pin of the voltage stabilizer and one end of the twelfth resistor (R10); the twelfth resistor (R10), the twentieth capacitor (C20) and the twenty-first capacitor (C21) are grounded at the other ends; the tenth resistor (R12) is connected with the power supply good indicator pin of the voltage stabilizer at the other end; the eleventh resistor (R13) is connected with one end of a twenty-second capacitor (C22) and the second voltage output end at the other end; the twenty-second capacitor (C22) is grounded at the other end;
The ground pin of the voltage stabilizer is grounded.
6. The analog-to-digital conversion apparatus of claim 5, wherein,
The sixteenth capacitance (C16) is 10 microfarads; the seventeenth capacitance (C17) is 100 nanofarads; the eighteenth capacitor (C18) is 100 nano-farads; the nineteenth capacitance (C19) is 10 nanofarads; the twentieth capacitance (C20) is 10 microfarads; the twenty-first capacitance (C21) is 100 nanofarads; the twenty-second capacitance (C22) is 100 nanofarads;
The eighth resistor (R9) is 100 kohms; -said ninth resistance (R11) is 10.5 kilo-ohms; the tenth resistor (R12) is 20 kilo-ohms; the eleventh resistor (R13) is 1-2 ohms; the twelfth resistor (R10) is 2 kilo-ohms.
7. The analog-to-digital conversion apparatus according to claim 2, wherein the third voltage conversion apparatus comprises:
The fourth voltage input end is connected with one end of a twenty-third capacitor (C35), a twenty-fourth capacitor (C36), a thirteenth resistor (R029) and a voltage input pin of the switching regulator;
The twenty-third capacitor (C35) and the twenty-fourth capacitor (C36) are grounded at the other ends; the thirteenth resistor (R029) is connected with the enabling pin of the switching regulator at the other end;
the voltage selection pin of the switching regulator is connected with one end of a fourteenth resistor (R32); the other end of the fourteenth resistor (R32) is grounded;
the second voltage output end is connected with one end of an inductor (L1), a twenty-fifth capacitor (C37) and a twenty-sixth capacitor (C38) and a detection pin of the switching regulator; the other end of the inductor (L1) is connected with a switch pin of the switching regulator; the twenty-fifth capacitor (C37) and the twenty-sixth capacitor (C38) are grounded at the other ends;
the ground pin of the switching regulator is grounded.
8. The analog-to-digital conversion apparatus of claim 7, wherein,
The twenty-third capacitance (C35) is 4.7 microfarads; the twenty-fourth capacitance (C36) is 100 nanofarads; the twenty-fifth capacitance (C37) is 10 microfarads; the twenty-sixth capacitance (C38) is 100 nanofarads;
the thirteenth resistance (R029) is 100 kilo-ohms; the fourteenth resistor (R32) is 249 kilo ohms;
the inductance (L1) is 470 nanohenry.
9. An analog to digital conversion apparatus according to any one of claims 1 to 8, wherein,
The first capacitance (C26) is 4.7 microfarads; the second capacitance (C27) is 100 nanofarads; the third capacitance (C23) is 100 nanofarads; the fourth capacitance (C28) is 4.7 microfarads; the fifth capacitance (C29) is 100 nanofarads; the sixth capacitance (C33) is 10 nanofarads; the seventh capacitance (C32) is 1 microfarad; the eighth capacitor (C25) is 10 nanofarads; the ninth capacitor (C24) is 10 nanofarads; the tenth capacitance (C30) is 1 microfarad; the eleventh capacitance (C31) is 10 nanofarads.
10. An analog to digital conversion apparatus according to any one of claims 1 to 8, wherein,
The second resistance (R15) is 100 ohms; the third resistor (R16) is 100 ohms.
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