CN115097196A - Output voltage acquisition method and analog-to-digital conversion circuit of digital arc welding power supply - Google Patents
Output voltage acquisition method and analog-to-digital conversion circuit of digital arc welding power supply Download PDFInfo
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- CN115097196A CN115097196A CN202210725601.3A CN202210725601A CN115097196A CN 115097196 A CN115097196 A CN 115097196A CN 202210725601 A CN202210725601 A CN 202210725601A CN 115097196 A CN115097196 A CN 115097196A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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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
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
Abstract
The invention discloses an output voltage acquisition method of a digital arc welding power supply and an analog-digital conversion circuit, wherein the analog-digital conversion circuit comprises an output voltage sampling conversion module, a threshold comparison module, a difference value calculation module and a control module, the input end of the threshold comparison module and the input end of the difference value calculation module are respectively connected with the output of the output voltage sampling conversion module, and the output end of the threshold comparison module and the output end of the difference value calculation module are respectively connected with the input end of the control module; the input of the difference value calculation module is also connected with the output of the threshold value comparison module; collecting output voltage analog quantity, and calculating sampling feedback quantity; comparing the sampling feedback quantity with the analog threshold voltage to obtain a comparison result, and assigning a value to the correction voltage according to the comparison result; calculating the difference value of the sampling feedback quantity and the correction voltage to obtain an analog conversion voltage; and calculating an analog-to-digital conversion value of the output voltage according to the comparison result and the analog conversion voltage. The acquisition precision is improved by adopting one path of A/D conversion, and the MCU overhead is saved.
Description
Technical Field
The invention relates to the technical field of digital arc welding power supplies, in particular to an output voltage acquisition method and an analog-to-digital conversion circuit of a digital arc welding power supply.
Background
At present, digital arc welding power supply equipment, particularly digital gas metal arc welding equipment, collects output voltage of a welding power supply in real time and performs corresponding operation, adjustment and time-sharing control according to the output voltage, namely the collection precision of the output voltage directly influences the real-time control of the output voltage of the welding power supply.
The actual welding voltage of the arc welding power supply is greatly different from the no-load voltage, and in order to realize the display of the output voltage, the margin is reserved during the design, and the acquisition processing circuit is designed according to the voltage larger than the no-load voltage. For this purpose, the methods adopted in the prior art include:
the method comprises the following steps: the analog sampling voltage range is designed according to the value larger than the no-load voltage value, the output voltage is adjusted and then input to an A/D port of the MCU, and in the actual welding process, the sampling precision of the welding voltage obtained by the method is low;
and secondly, selecting two A/D ports of the MCU, wherein the sampling voltage range of one port is designed according to the actual welding voltage, the sampling voltage range of the other port is designed according to the voltage larger than the no-load voltage, the output voltage is divided into two paths, and the two paths of the output voltage are input into the two A/D ports of the MCU after being adjusted.
Therefore, how to sample the output voltage of the digital arc welding power supply and simplify the processing process is a problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide an output voltage acquisition method and an analog-to-digital conversion circuit of a digital arc welding power supply, wherein the output voltage is compared with an analog threshold voltage, when the output voltage is greater than the analog threshold voltage, only the part greater than the analog threshold voltage is subjected to analog-to-digital conversion to obtain a first conversion value, and in addition, the analog-to-digital conversion second conversion value of the analog threshold voltage is added to obtain an output voltage digital quantity, when the output voltage is less than or equal to the analog threshold voltage, the analog-to-digital conversion is directly carried out, the output voltage is subjected to range division, corresponding calculation is carried out according to the range, the calculation process and the circuit are simplified, and the conversion precision is improved.
In a first aspect, the above object of the present invention is achieved by the following technical solutions:
a digital arc welding power supply output voltage acquisition method, collect the output voltage and compare with analog threshold voltage, obtain the value range of the output voltage, after the analog-to-digital conversion to the output voltage less than or equal to analog threshold voltage, obtain the analog-to-digital conversion value of the output voltage; and performing analog-to-digital conversion on the part of the output voltage higher than the analog threshold voltage, and combining the analog-to-digital conversion result with the analog threshold voltage to obtain an analog-to-digital conversion value of the output voltage.
The invention is further configured to: comparing the output voltage sampling feedback quantity with the analog threshold voltage to obtain a comparison result, assigning a value to the correction voltage according to the comparison result, carrying out difference operation on the feedback voltage and the correction voltage to obtain an analog conversion voltage, carrying out AD conversion on the analog conversion voltage to obtain a first conversion value, converting the analog threshold voltage to obtain a second conversion value, and determining whether the first conversion value and the second conversion value are added to obtain an analog-to-digital conversion value of the output voltage according to the comparison result.
The invention is further configured to: when the sampling feedback quantity of the output voltage is greater than the analog threshold voltage, assigning the analog threshold voltage to a correction voltage; and when the sampling feedback quantity of the output voltage is less than or equal to the analog threshold voltage, assigning the value of the correction voltage to be zero.
The invention is further configured to: when the sampling feedback quantity of the output voltage is larger than the analog threshold voltage, obtaining a first comparison result, and adding the first conversion value and the second conversion value to obtain an operation result as an analog-to-digital conversion value of the sampling feedback quantity; when the output voltage sampling feedback quantity is less than or equal to the analog threshold voltage, obtaining a second comparison result; and taking the first conversion value as an analog-to-digital conversion value of the sampling feedback quantity.
In a second aspect, the above object of the present invention is achieved by the following technical solutions:
an output voltage acquisition analog-to-digital conversion circuit of a digital arc welding power supply comprises an output voltage sampling conversion module, a threshold comparison module, a difference value calculation module and a control module, wherein the input end of the threshold comparison module and the input end of the difference value calculation module are respectively connected with the output of the output voltage sampling conversion module, and the output end of the threshold comparison module and the output end of the difference value calculation module are respectively connected with the input end of the control module; the input of the difference value calculation module is also connected with the output of the threshold value comparison module; the output voltage sampling conversion module is used for collecting output voltage analog quantity, calculating sampling feedback quantity and respectively transmitting the sampling feedback quantity to the difference value calculation module and the threshold value comparison module; the threshold comparison module is used for comparing the sampling feedback quantity with the analog threshold voltage, obtaining a comparison result and transmitting the comparison result to the control module, assigning a value for the correction voltage according to the comparison result and transmitting the value to the difference value calculation module; the difference value calculation module is used for calculating the difference value between the sampling feedback quantity and the correction voltage to obtain an analog conversion voltage; and the control module calculates an output voltage analog-to-digital conversion value according to the comparison result and the analog conversion voltage.
The invention is further configured to: the input of the feedback voltage following module is connected with the output voltage sampling conversion module, the output of the feedback voltage following module is connected with the difference value calculation module, the input of the level following module is connected with the output of the threshold comparison module, and the output of the level following module is connected with the control module.
The invention is further configured to: the control module comprises analog-to-digital conversion and is used for converting the analog quantity output by the difference value calculation module into a first conversion value and calculating an output voltage analog-to-digital conversion value by combining a comparison result and a second conversion value corresponding to the threshold voltage.
The invention is further configured to: the difference value calculation module comprises a difference value calculation circuit, the difference value calculation circuit comprises an amplifier and a peripheral circuit, a sampling feedback voltage output by the output voltage sampling conversion module is input to the positive input end of the amplifier after being subjected to voltage division, the output of the threshold value comparison module is connected with one end of the connecting resistor and the negative input end of the amplifier, the negative input end of the amplifier is connected to the output end of the amplifier through the first resistor, the difference value operation of the feedback voltage and the threshold value comparison module is realized, and the analog conversion voltage is obtained.
The invention is further configured to: the threshold comparison module comprises a comparator, the feedback voltage following module comprises a first voltage following circuit, and the level following module comprises a second voltage following circuit.
In a third aspect, the above object of the present invention is achieved by the following technical solutions:
an output voltage acquisition analog-to-digital conversion terminal of a digital arc welding power supply comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein when the processor executes the computer program, analog-to-digital conversion is carried out on analog conversion voltage to obtain a first conversion value, analog threshold voltage is converted to obtain a second conversion value, whether the first conversion value and the second conversion value are added or not is determined according to a comparison result of output voltage sampling feedback quantity and the analog threshold voltage, and the analog-to-digital conversion value of the output voltage is obtained according to an operation result.
Compared with the prior art, the beneficial technical effects of this application do:
1. the output voltage is divided into different ranges by setting the analog threshold voltage; for output voltages in different ranges, a method of direct analog-to-digital conversion or addition operation after analog-to-digital conversion is adopted to obtain output voltage digital quantity, so that the calculation process is simplified, and the MCU overhead is saved;
2. furthermore, after the output voltage is compared with the analog threshold voltage, the correction voltage is set according to the comparison result, the difference value between the feedback quantity of the output voltage and the correction voltage is calculated to obtain the analog conversion voltage, only the analog conversion voltage is subjected to analog-to-digital conversion, and the expenditure of the MCU is reduced;
3. furthermore, the analog conversion voltage and the comparison result are combined, and one-way analog-to-digital conversion is used for realizing the analog-to-digital conversion within the full output voltage range, so that the circuit structure is simplified, and the cost is saved.
Drawings
FIG. 1 is a schematic diagram of an analog-to-digital conversion circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an analog-to-digital conversion circuit according to yet another embodiment of the present application;
FIG. 3 is a schematic diagram of the operational structure of a control circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of the control circuit operation according to an embodiment of the present application;
fig. 5 is a schematic diagram of an analog-to-digital conversion circuit according to still another embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The method comprises the steps of setting an analog threshold voltage, comparing an output voltage feedback quantity with the analog threshold voltage to obtain a comparison result, wherein the comparison result is used for showing the range of the output voltage; and when the output voltage feedback quantity is less than or equal to the analog threshold voltage, setting the correction voltage to be equal to zero, and performing analog-to-digital conversion on the output voltage feedback quantity to obtain an output voltage digital conversion result.
In one embodiment of the present application, the correction voltage is set according to the comparison result, and when the feedback amount of the output voltage is greater than the analog threshold voltage, the correction voltage value is set equal to the analog threshold voltage value.
The output voltage acquisition analog-to-digital conversion circuit of the digital arc welding power supply comprises an output voltage sampling conversion module, a threshold comparison module, a difference value calculation module and a control module, wherein the input end of the threshold comparison module and the input end of the difference value calculation module are respectively connected with the output of the output voltage sampling conversion module, and the output end of the threshold comparison module and the output end of the difference value calculation module are respectively connected with the input end of the control module, as shown in figure 1.
The output voltage sampling conversion module is used for collecting the output voltage analog quantity Uo and calculating the sampling feedback quantity V f And respectively transmitted to a difference value calculation module and a threshold value comparison module.
The threshold comparison module samples the feedback quantity V f And an analog threshold voltage V th Comparing to obtain a comparison result A according to the ratioThe comparison result is assigned to a correction voltage V k Will correct the voltage V k And transmitting the comparison result to a difference value calculation module and transmitting the comparison result to a control module.
The input of the difference value calculation module is also connected with the output of the threshold value comparison module and is used for sampling the feedback quantity V f And a correction voltage V k Performing difference operation to obtain analog conversion voltage V ad And output to the control module.
The control module compares the comparison result A with the analog conversion voltage V ad And calculating the analog-to-digital conversion value of the output voltage.
The control module calculates the digital quantity U of the output voltage dig Expressed by the following formula:
U dig ＝(V ad ×2 n /V DD )+(V th ×2 n /V DD )×K th (1)；
in the formula 2 n Representing the A/D sampling digital quantity range, and n represents the A/D sampling digit number;
V DD representing A/D sampling standard voltage value;
V th representing the analog threshold voltage, and presetting according to the acquisition voltage range;
K th the effective coefficient of the analog threshold voltage is represented, and the value of the effective coefficient is switching value and is 0 or 1.
The analog conversion voltage is the feedback voltage V after the output voltage of the arc welding power supply is adjusted f And its correction voltage V k And characterizing, wherein the expression is as follows:
V ad ＝V f -V k (2)；
wherein, V k The values of (A) are as follows:
feedback voltage V f Output voltage U from arc welding power supply O And its adjustment factor K u And (3) performing characterization, wherein the expression is as follows:
V f ＝K u ×U O (4)；
when the corrected voltage is equal to the analog threshold voltage, the digital value U of the output voltage under different conditions is analyzed according to the formula (3) dig The specific calculation formula of (2).
At V f ≤V th When, V k ＝0，K th ＝0；
In combination with equation (2), then V ad ＝V f ；
Equation (1) becomes:
U dig ＝V f ×2 n /V DD (5)；
at V f >V th When the correction voltage is equal to the analog threshold voltage, V k ＝V th ，K th ＝1；
In combination with equation (2), then V ad ＝V f -V th ；
Equation (1) becomes:
U dig ＝V f ×2 n /V DD (6)；
it can be seen that V f ≤V th Or V f >V th While, U dig Indicating that only the feedback quantity V needs to be sampled f According to V, according to f And an analog threshold voltage V th As a result of comparison of (1), at V f >V th Will simulate a threshold voltage V th The digital value of the output voltage can be obtained by adding the AD conversion result of (2). According to the method, the acquisition precision of the output voltage of the digital arc welding power supply can be improved by only adopting one path of A/D conversion, the expense of MCU for A/D sampling is saved, the operation and adjustment precision of the MCU on the output voltage is improved, the fine control of the output voltage of the digital arc welding power supply is favorably promoted, and the improvement of the welding arc performance can be realized.
In a specific embodiment of the present application, as shown in fig. 2, in addition to the modules included in fig. 1, the present application further includes a feedback voltage following module and a level following module, wherein an input of the feedback voltage following module is connected to the output voltage sampling conversion module, and an output of the feedback voltage following module is connected to the difference value calculation module for pair samplingSample feedback quantity V f Carrying out voltage following; the input of the level following module is connected with the output of the threshold comparison module, the output of the level following module is connected with the control module, and the level following module is used for correcting the voltage V output by the threshold comparison module k Follow-up is performed.
The follower circuit is used for impedance isolation.
The signals received by the control circuit are the analog conversion voltage and the correction voltage, and are not changed.
As shown in FIG. 3, the control module includes an analog-to-digital converter AD for converting the analog conversion V output from the difference calculation module ad Is converted into a first conversion value V ad-dig Combining the comparison result with the analog threshold voltage V th Corresponding second conversion value V th-dig And calculating the analog-to-digital conversion value of the output voltage.
As shown in FIG. 4, when the sampled feedback value is greater than the analog threshold voltage, the comparison result is input from the I/O port of the control module, and when the corrected voltage V of the I/O port is greater than the analog threshold voltage k And when the voltage is at a high level, adding the first conversion value and the second conversion value to obtain an output voltage analog-to-digital conversion value.
When the sampling feedback value is larger than the analog threshold voltage, the corrected voltage V of the I/O port k And at a low level, taking the first conversion value as an output voltage analog-to-digital conversion value.
In an embodiment of the present application, as shown in fig. 5, the feedback voltage following module includes a first following circuit, the first following circuit includes an operational amplifier IC1A, a negative input terminal of the operational amplifier IC1A is connected to the output terminal of the output voltage sampling conversion module through a resistor R35, and a positive input terminal thereof is connected to the output terminal for following the output sampling feedback quantity at the output terminal of the output voltage sampling conversion module.
The threshold comparison module comprises a comparison circuit, the comparison circuit comprises a comparator IC2B, the positive input end of which is connected to the output end of the output voltage sampling conversion module through a resistor R37, the negative input end of which is connected to the threshold voltage end through a resistor R36, and the output end of which is output through a resistor R32.
The output of the threshold comparison module is connected to a correction voltage power supply end through a pull-up resistor R31, and outputs a correction voltage value when the threshold comparison module outputs a high level, and outputs zero when the threshold comparison module outputs a low level.
The difference value calculating module comprises a difference value calculating circuit, the difference value calculating circuit comprises an amplifier IC3B and a peripheral circuit, and the sampling feedback voltage is connected to the positive input end of the amplifier IC3B after being divided by resistors R30/R39. The negative input end of the amplifier IC3B is connected with the output of the threshold comparison module, the output end of the amplifier IC3 is connected with the output end through a resistor R25, and the output end of the amplifier IC3 is connected with the control module through a resistor R20 and used for carrying out difference operation on the sampling feedback quantity and the correction voltage to obtain the analog conversion voltage.
The level follower circuit comprises a second follower circuit which comprises an operational amplifier IC1B and peripheral circuits thereof, wherein a negative input end of the IC1B is connected to an output end, a positive input end is connected to the output end of the threshold comparison module through a resistor R23, and an output end is connected to an I/O port of the control module and is grounded through a resistor R21.
The application discloses digital arc welding power supply's output voltage acquisition analog-to-digital conversion terminal, including memory, treater and storage in the memory and can be in the computer program of operation on the treater, the treater carries out during the computer program, carries out analog-to-digital conversion to analog conversion voltage, obtains first conversion value, converts analog threshold voltage, obtains second conversion value, according to the contrast result of output voltage sampling feedback quantity and analog threshold voltage, decides whether first conversion value adds the operation with second conversion value, obtains output voltage's analog-to-digital conversion value according to the operation result.
Specifically, when the comparison result is 1, adding the first conversion value and the second conversion value as the analog-to-digital conversion value of the output voltage; and when the comparison result is 0, taking the first conversion value as the analog-to-digital conversion value of the output voltage.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention. The one or more modules/units can be a series of instruction segments of a computer program capable of performing specific functions, and the instruction segments are used for describing the execution process of the computer program in the output voltage acquisition analog-to-digital conversion terminal equipment of the digital arc welding power supply. For example, the computer program may be divided into a plurality of modules, each module having the following specific functions:
1. the judging module is used for judging whether the comparison result is a high level or a low level;
2. and the calculating module is used for calculating the digital quantity of the output voltage.
The output voltage acquisition analog-to-digital conversion terminal equipment of the digital arc welding power supply can be computing equipment such as a desktop computer, a notebook computer, a palm computer and a cloud server. The output voltage acquisition analog-to-digital conversion terminal equipment of the digital arc welding power supply can comprise, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that the above examples are merely examples of the output voltage acquisition analog-to-digital conversion terminal device of the digital arc welding power supply, and do not constitute a limitation of the output voltage acquisition analog-to-digital conversion terminal device of the digital arc welding power supply, and may include more or less components than those shown, or combine certain components, or different components, for example, the output voltage acquisition analog-to-digital conversion terminal device of the digital arc welding power supply may further include an input-output device, a network access device, a bus, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. The general processor can be a microprocessor or the processor can be any conventional processor and the like, the processor is a control center of the output voltage acquisition analog-to-digital conversion terminal equipment of the digital arc welding power supply, and various interfaces and lines are utilized to connect various parts of the output voltage acquisition analog-to-digital conversion terminal equipment of the whole digital arc welding power supply.
The memory can be used for storing the computer program and/or the module, and the processor realizes various functions of the output voltage acquisition analog-to-digital conversion terminal equipment of the digital arc welding power supply by operating or executing the computer program and/or the module stored in the memory and calling the data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The embodiments of the present invention are all preferred embodiments of the present invention, and the scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The output voltage acquisition method of the digital arc welding power supply is characterized in that the output voltage is acquired and compared with an analog threshold voltage to obtain the value range of the output voltage, and the analog-to-digital conversion value of the output voltage is obtained after the analog-to-digital conversion is carried out on the output voltage lower than or equal to the analog threshold voltage; and performing analog-to-digital conversion on the part of the output voltage higher than the analog threshold voltage, and combining the analog-to-digital conversion result with the analog threshold voltage to obtain an analog-to-digital conversion value of the output voltage.
2. The output voltage collecting method of a digital arc welding power supply according to claim 1, wherein the sampled feedback quantity of the output voltage is compared with an analog threshold voltage to obtain a comparison result, the correction voltage is assigned according to the comparison result, the feedback voltage and the correction voltage are subjected to a difference operation to obtain an analog conversion voltage, the analog conversion voltage is subjected to an AD conversion to obtain a first conversion value, the analog threshold voltage is converted to obtain a second conversion value, and whether the first conversion value is added to the second conversion value is determined according to the comparison result to obtain an analog-to-digital conversion value of the output voltage.
3. The output voltage collecting method of a digitized arc welding power supply according to claim 2, characterized in that when the output voltage sampling feedback amount is larger than the analog threshold voltage, the analog threshold voltage is assigned to the correction voltage; and when the sampling feedback quantity of the output voltage is less than or equal to the analog threshold voltage, assigning the value of the correction voltage to be zero.
4. The output voltage collecting method of a digitized arc welding power supply according to claim 2, wherein when the sampling feedback quantity of the output voltage is larger than the analog threshold voltage, a first comparison result is obtained, the first conversion value and the second conversion value are added, and the operation result is used as an analog-to-digital conversion value of the sampling feedback quantity; when the output voltage sampling feedback quantity is less than or equal to the analog threshold voltage, obtaining a second comparison result; and taking the first conversion value as an analog-to-digital conversion value of the sampling feedback quantity.
5. An output voltage acquisition analog-to-digital conversion circuit of a digital arc welding power supply is characterized by comprising an output voltage sampling conversion module, a threshold value comparison module, a difference value calculation module and a control module, wherein the input end of the threshold value comparison module and the input end of the difference value calculation module are respectively connected with the output of the output voltage sampling conversion module, and the output end of the threshold value comparison module and the output end of the difference value calculation module are respectively connected with the input end of the control module; the input of the difference value calculation module is also connected with the output of the threshold value comparison module; the output voltage sampling conversion module is used for collecting output voltage analog quantity, calculating sampling feedback quantity and respectively transmitting the sampling feedback quantity to the difference value calculation module and the threshold value comparison module; the threshold comparison module is used for comparing the sampling feedback quantity with the analog threshold voltage, obtaining a comparison result and transmitting the comparison result to the control module, assigning a value for the correction voltage according to the comparison result and transmitting the value to the difference value calculation module; the difference value calculation module is used for calculating the difference value between the sampling feedback quantity and the correction voltage to obtain an analog conversion voltage; and the control module calculates an output voltage analog-to-digital conversion value according to the comparison result and the analog conversion voltage.
6. The output voltage acquisition analog-to-digital conversion circuit of the digital arc welding power supply according to claim 5, characterized by further comprising a feedback voltage following module and a level following module, wherein the input of the feedback voltage following module is connected with the output voltage sampling conversion module, the output of the feedback voltage following module is connected with the difference value calculation module, the input of the level following module is connected with the output of the threshold comparison module, and the output of the level following module is connected with the control module.
7. The output voltage collecting analog-to-digital conversion circuit of the digitized arc welding power supply according to claim 6, wherein the control module includes an analog-to-digital converter for converting the analog quantity output by the difference calculation module into a first conversion value and calculating an output voltage analog-to-digital conversion value in combination with a second conversion value corresponding to the comparison result and the threshold voltage.
8. The output voltage acquisition analog-to-digital conversion circuit of the digital arc welding power supply according to claim 6, characterized in that the difference calculation module comprises a difference calculation circuit, the difference calculation circuit comprises an amplifier and a peripheral circuit, the sampled feedback voltage output by the output voltage sampling conversion module is divided and then input to the positive input end of the amplifier, the output of the threshold comparison module is connected with one end of an upper connecting resistor and the negative input end of the amplifier, the negative input end of the amplifier is connected to the output end of the amplifier through a first resistor, so as to realize the difference operation of the feedback voltage and the threshold comparison module, and obtain the analog conversion voltage.
9. The output voltage acquisition analog-to-digital conversion circuit of the digital arc welding power supply according to claim 6, wherein the threshold comparison module comprises a comparator, the feedback voltage follower module comprises a first voltage follower circuit, and the level follower module comprises a second voltage follower circuit.
10. An output voltage acquisition analog-to-digital conversion terminal of a digital arc welding power supply, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: when the processor executes the computer program, analog-to-digital conversion is carried out on the analog conversion voltage to obtain a first conversion value, the analog threshold voltage is converted to obtain a second conversion value, whether the first conversion value and the second conversion value are added or not is determined according to a comparison result of the output voltage sampling feedback quantity and the analog threshold voltage, and the analog-to-digital conversion value of the output voltage is obtained according to an operation result.
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