CN117870750A - Sensor calibration equipment precision improvement circuit - Google Patents

Abstract

The invention provides a sensor calibration equipment precision improving circuit, comprising: the sensor comprises a power conditioning circuit, a voltage dividing circuit, a sensor bridge stack, an amplifying circuit and an analog-to-digital conversion module; the sensor calibration equipment precision improving circuit takes a battery direct-current power supply as a power supply, and the battery direct-current power supply is connected with the power supply conditioning circuit. The circuit of the invention uses the battery direct current power supply as the power supply, instead of the traditional commercial power alternating current power supply, can avoid the unstable problem of the commercial power alternating current power supply, does not have larger ripple wave input into the sensor calibration equipment, avoids the reduction of the accuracy of the sensor calibration equipment caused by the ripple wave of the power supply to a large extent, and: the power supply voltage after the voltage division is regulated is used as the reference voltage of the analog-digital conversion module; or the power supply voltage after the voltage division is conditioned is used as the other input of the analog-digital conversion module; the reduction of the power supply to the precision is reduced, the precision of the sensor calibration equipment is improved, and the technical requirement of the sensor calibration equipment for improving the calibration precision is met.

Description

Sensor calibration equipment precision improvement circuit

Technical Field

The invention relates to a precision improving circuit of sensor calibration equipment, in particular to a precision improving circuit of calibration equipment for an intelligent assembly press-fit control sensor.

Background

The force sensor in the intelligent assembly press-fit control can be calibrated or calibrated before the product leaves the factory and after the sensor leaves the factory for a period of time, and input and output and performance indexes are regulated and calibrated; if the environmental condition of the sensor is severe, the requirement of the calibration equipment is larger, and the traditional calibration equipment has larger volume and heavy operation, so that the efficiency of the calibration task is reduced; developing a high-precision, portable, efficient sensor calibration device can solve the above-mentioned problems, and in particular, how to improve the precision of the calibration device is a key technology in development.

In a hardware circuit of the calibration equipment, the stability of power supply input has an important influence on the circuit, the power supply of the traditional sensor calibration equipment is a commercial power alternating current power supply, the power is larger, the stability of the power supply input is insufficient, the ripple wave of the power supply input is larger, and the influence on the circuit can reduce the precision of the calibration equipment; the reference voltage accessed by an analog-to-digital conversion module in a circuit of the traditional sensor calibration equipment is generated by a standard voltage generation module, is irrelevant to the power supply voltage of the sensor calibration equipment, and cannot reduce the influence of the power supply on the accuracy of the calibration equipment; in the software of the conventional sensor calibration device, the solution to the power supply problem is also insufficient.

Disclosure of Invention

The invention aims to overcome the defects that in the prior art, the power supply of a sensor calibration device is a commercial power alternating current power supply, the power is larger, the stability of power supply input is insufficient, the ripple wave of the power supply input is larger, the influence on a circuit can reduce the precision of the calibration device, and the solutions in the circuit and software are insufficient.

The invention solves the technical problems through the following technical scheme:

the invention provides a sensor calibration device precision improving circuit, which comprises: the sensor comprises a power conditioning circuit, a voltage dividing circuit, a sensor bridge stack, an amplifying circuit and an analog-to-digital conversion module;

the sensor calibration equipment precision improving circuit takes a battery direct-current power supply as a power supply, and the battery direct-current power supply is connected with the power supply conditioning circuit;

the first voltage output by the battery direct-current power supply is conditioned by the power conditioning circuit and then output, the third voltage obtained by dividing the output second voltage by the voltage dividing circuit is input into the analog-to-digital conversion module to serve as a reference voltage, the second voltage is also connected into the input end of the sensor bridge stack to serve as the input voltage of the sensor bridge stack, the output end of the sensor bridge stack is connected with the amplifying circuit, the fourth voltage output by the output end of the sensor bridge stack is amplified by the amplifying circuit and then input into the analog-to-digital conversion module, and the output end of the analog-to-digital conversion module outputs a sensor monitoring voltage when the third voltage is the reference voltage and is in direct proportion to the pressure monitored by the sensor.

The invention also provides a sensor calibration device precision improving circuit, which comprises: the system comprises a power conditioning circuit, a voltage dividing circuit, a sensor bridge stack, an amplifying circuit, an analog-to-digital conversion module and a standard voltage generation module;

the sensor calibration equipment precision improving circuit takes a battery direct-current power supply as a power supply, and the battery direct-current power supply is connected with the power supply conditioning circuit;

the standard voltage generated by the standard voltage generating module is input into the analog-to-digital conversion module to serve as reference voltage, fifth voltage output by the battery direct-current power supply is conditioned by the power conditioning circuit and then output, the output sixth voltage is connected with the input end of the sensor bridge stack to serve as the input voltage of the sensor bridge stack, the output end of the sensor bridge stack is connected with the amplifying circuit, seventh voltage output by the output end of the sensor bridge stack is amplified by the amplifying circuit and then input into the first input end of the analog-to-digital conversion module, eighth voltage obtained by dividing the sixth voltage by the voltage dividing circuit is input into the second input end of the analog-to-digital conversion module, and the output end of the analog-to-digital conversion module outputs the ratio or time division of the ninth voltage after analog-to-digital conversion to the tenth voltage after analog-digital conversion when the standard voltage is the reference voltage.

On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.

The invention has the positive progress effects that: the sensor calibration equipment precision improving circuit of the invention uses the battery direct current power supply as the power supply, instead of the traditional commercial power alternating current power supply, can avoid the unstable problem of the power supply of the commercial power alternating current power supply, does not have larger ripple waves to be input into the sensor calibration equipment, avoids the reduction of the accuracy of the sensor calibration equipment caused by the ripple waves of the power supply to a large extent, and: the power supply voltage after the voltage division is regulated is used as the reference voltage of the analog-digital conversion module; or the power supply voltage after the voltage division is conditioned is used as the other input of the analog-digital conversion module; the reduction of the power supply to the precision is reduced, the precision of the sensor calibration equipment is improved, and the technical requirement of the sensor calibration equipment for improving the calibration precision is met.

Drawings

Fig. 1 is a circuit schematic diagram of a sensor calibration apparatus accuracy improvement circuit of embodiment 1 of the present invention.

Fig. 2 is a circuit schematic diagram of a sensor calibration apparatus accuracy improvement circuit of embodiment 2 of the present invention.

Detailed Description

The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown.

Example 1

Fig. 1 shows a sensor calibration device accuracy improvement circuit of the present embodiment. The sensor calibration device accuracy improvement circuit 100 includes: a power conditioning circuit 110, a voltage divider circuit 120, a sensor bridge stack 130, an amplifying circuit 140, and an analog to digital conversion module 150.

The sensor calibration device accuracy improving circuit 100 uses a battery dc power supply 160 as a power supply, and the battery dc power supply 160 is connected with the power conditioning circuit 110. The power supply of the sensor calibration device of the present embodiment is not the commercial ac power supply of the conventional sensor calibration device, but is the battery dc power supply 160; the battery direct current power supply 160 can avoid the problem of instability of the mains alternating current power supply, no larger ripple wave is input into the sensor calibration equipment, and the reduction of the accuracy of the sensor calibration equipment caused by the ripple wave of the power supply is avoided to a large extent.

The first voltage output by the battery dc power supply 160 is conditioned by the power conditioning circuit 110 and then output, the second voltage output is divided by the voltage dividing circuit 120 and then input into the analog-to-digital conversion module 150 as a reference voltage V, the second voltage is further connected to the input end of the sensor bridge stack 130 and used as the input voltage of the sensor bridge stack 130, the output end of the sensor bridge stack 130 is connected to the amplifying circuit 140, the fourth voltage output by the output end of the sensor bridge stack 130 is amplified by the amplifying circuit 140 and then input into the analog-to-digital conversion module 150 (i.e., vin1 in fig. 1), and the output end of the analog-to-digital conversion module 150 outputs a sensor monitoring voltage Vout when the third voltage is the reference voltage, where the sensor monitoring voltage is proportional to the pressure monitored by the sensor.

The fourth voltage is proportional to the pressure monitored by the sensor, the voltage amplified by the fourth voltage is input to the first input end of the analog-to-digital conversion module 150, and then the analog-to-digital conversion module 150 performs analog-to-digital conversion on the voltage input by the first input end to generate the sensor monitoring voltage, and the voltage is irrelevant to the voltage loaded at the input end of the sensor bridge stack 130, so that the reduction of the accuracy of the power supply is reduced, and the accuracy of the sensor calibration device is improved. Calibration of the sensor may be performed by monitoring the voltage through the sensor.

Example 2

Fig. 2 shows a sensor calibration device accuracy improvement circuit of the present embodiment. The sensor calibration device accuracy improvement circuit 200 includes: the power conditioning circuit 210, the voltage divider circuit 220, the sensor bridge stack 230, the amplifying circuit 240, the analog-to-digital conversion module 250, and the standard voltage generation module 260.

The sensor calibration device accuracy improvement circuit 200 uses a battery dc power supply 270 as a power supply, and the battery dc power supply 270 is connected to the power conditioning circuit 210. The power supply of the sensor calibration device of the present embodiment is not the commercial ac power supply of the conventional sensor calibration device, but is the battery dc power supply 270; the battery direct current power supply 270 can avoid the problem of instability of the mains alternating current power supply, no larger ripple wave is input into the sensor calibration equipment, and the reduction of the accuracy of the sensor calibration equipment caused by the ripple wave of the power supply is avoided to a large extent.

The standard voltage generated by the standard voltage generating module 260 is input to the analog-to-digital conversion module 250 as a reference voltage V, a fifth voltage output by the battery dc power supply 270 is conditioned by the power conditioning circuit 210 and then output, the output sixth voltage is connected to the input end of the sensor bridge stack 230 and is used as the input voltage of the sensor bridge stack 230, the output end of the sensor bridge stack 230 is connected to the amplifying circuit 240, a seventh voltage output by the output end of the sensor bridge stack 230 is amplified by the amplifying circuit 240 and then is input to the first input end Vin1 of the analog-to-digital conversion module 250, an eighth voltage obtained by dividing the sixth voltage by the voltage dividing circuit 220 is input to the second input end Vin2 of the analog-to-digital conversion module 250, and when the standard voltage is the reference voltage, the ratio of the voltage obtained by analog-to-digital conversion of the voltage at the first input end Vin1 to the voltage at the second input end Vin or the tenth voltage obtained by analog-to-digital conversion of the voltage at the second input end 2 is output.

The seventh voltage is proportional to the pressure monitored by the sensor, the voltage amplified by the seventh voltage is input to the first input terminal Vin1 of the analog-to-digital conversion module 250, and then the voltage input to the first input terminal Vin1 is analog-to-digital converted by the analog-to-digital conversion module 250 to generate the ninth voltage. In one embodiment, the analog-to-digital conversion module 250 may directly output the ratio of the ninth voltage to the tenth voltage, or the analog-to-digital conversion module 250 may output the ninth voltage to the tenth voltage in a time-sharing manner, and then calculate the ratio of the ninth voltage to the tenth voltage by using a calibration software, and perform calibration of the sensor by using the ratio. Because the output is the ratio of the voltages, the influence caused by the power supply voltage fluctuation is reduced, and the accuracy of the sensor calibration equipment is improved.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.

Claims (2)

1. A sensor calibration device accuracy improvement circuit, characterized in that the sensor calibration device accuracy improvement circuit comprises: the sensor comprises a power conditioning circuit, a voltage dividing circuit, a sensor bridge stack, an amplifying circuit and an analog-to-digital conversion module;

the sensor calibration equipment precision improving circuit takes a battery direct-current power supply as a power supply, and the battery direct-current power supply is connected with the power supply conditioning circuit;

the first voltage output by the battery direct-current power supply is conditioned by the power conditioning circuit and then output, the third voltage obtained by dividing the output second voltage by the voltage dividing circuit is input into the analog-to-digital conversion module to serve as a reference voltage, the second voltage is also connected into the input end of the sensor bridge stack to serve as the input voltage of the sensor bridge stack, the output end of the sensor bridge stack is connected with the amplifying circuit, the fourth voltage output by the output end of the sensor bridge stack is amplified by the amplifying circuit and then input into the analog-to-digital conversion module, and the output end of the analog-to-digital conversion module outputs a sensor monitoring voltage when the third voltage is the reference voltage and is in direct proportion to the pressure monitored by the sensor.

2. A sensor calibration device accuracy improvement circuit, characterized in that the sensor calibration device accuracy improvement circuit comprises: the system comprises a power conditioning circuit, a voltage dividing circuit, a sensor bridge stack, an amplifying circuit, an analog-to-digital conversion module and a standard voltage generation module;

the sensor calibration equipment precision improving circuit takes a battery direct-current power supply as a power supply, and the battery direct-current power supply is connected with the power supply conditioning circuit;

the standard voltage generated by the standard voltage generating module is input into the analog-to-digital conversion module to serve as reference voltage, fifth voltage output by the battery direct-current power supply is conditioned by the power conditioning circuit and then output, the output sixth voltage is connected with the input end of the sensor bridge stack to serve as the input voltage of the sensor bridge stack, the output end of the sensor bridge stack is connected with the amplifying circuit, seventh voltage output by the output end of the sensor bridge stack is amplified by the amplifying circuit and then input into the first input end of the analog-to-digital conversion module, eighth voltage obtained by dividing the sixth voltage by the voltage dividing circuit is input into the second input end of the analog-to-digital conversion module, and the output end of the analog-to-digital conversion module outputs the ratio or time division of the ninth voltage after analog-to-digital conversion to the tenth voltage after analog-digital conversion when the standard voltage is the reference voltage.