Circuit for robot controller to set current and voltage of welding machine

Abstract

The utility model provides a circuit for setting current and voltage of a welding machine for a robot controller, and the circuit comprises a main control module which is used for outputting a PWM signal; the input end of the optocoupler isolation module is connected with the output end of the main control module, and the optocoupler isolation module is used for isolating the PWM signals output by the optocoupler isolation module; the input end of the signal conversion module is connected with the output end of the optocoupler isolation module, and the signal conversion module is used for converting the PWM signal output by the optocoupler isolation module into an analog signal; the input end of the operational amplification module is connected with the output end of the signal conversion module, analog signals output by the signal conversion module enter the operational amplification module in a differential input mode, and the operational amplification module conducts buffering isolation and signal conditioning on the analog signals.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automatic welding, specifically to a circuit for robot controller setting welding machine current voltage. BACKGROUND

[0002] In the automatic welding system, the control voltage and current in the welding process are the key factors to ensure the welding quality and stability. At present, many welding robot systems use 0~10V analog signals to control the welding voltage and current of the welding machine. This control method is widely used in different types of welding processes due to its simplicity and adaptability. It can realize real-time control of current and voltage through simple voltage adjustment, thereby meeting the basic needs of most welding processes.

[0003] In related technologies, many controller CPUs do not directly support analog output, and need to realize analog signal conversion through SPI, I2C and other interfaces. These interface conversion chips are expensive and require supporting peripheral components, increasing the overall cost and software workload. In addition, the traditional technology also has deficiencies in anti-interference ability and response speed in complex electromagnetic environments, which is difficult to meet the welding requirements of high precision and high reliability SUMMARY

[0004] In view of the above problems, the utility model embodiment provides a circuit for robot controller setting welding machine current voltage, which comprises: a main control module, the main control module is used for outputting PWM signal;

[0005] An optical coupling isolation module, the input end of the optical coupling isolation module is connected with the output end of the main control module, and the optical coupling isolation module is used for isolating the PWM signal output by the optical coupling isolation module;

[0006] A signal conversion module, the input end of the signal conversion module is connected with the output end of the optical coupling isolation module, and the signal conversion module is used for converting the PWM signal output by the optical coupling isolation module into an analog signal;

[0007] An operational amplifier module, the input end of the operational amplifier module is connected with the output end of the signal conversion module, the analog signal output by the signal conversion module enters the operational amplifier module through differential input, and the operational amplifier module buffers and isolates the analog signal and signal conditioning.

[0008] In one embodiment, the optical coupling isolation module includes optical coupling U3 and optical coupling U5, and the input ends of the optical coupling U3 and the optical coupling U5 are respectively connected with two output ends of the main control module for outputting PWM signal.

[0009] In one of the embodiments, the optical coupler U3 and the optical coupler U5 are both of the model U5ELM611.

[0010] In one of the embodiments, the signal conversion module comprises a signal conversion chip U2 and a signal conversion chip U6, the input end of the signal conversion chip U2 is connected with the output end of the optical coupler U3, and the input end of the signal conversion chip U6 is connected with the output end of the optical coupler U5.

[0011] In one of the embodiments, the signal conversion chip U2 and the signal conversion chip U6 are both of the model GP8101.

[0012] In one of the embodiments, the operational amplifier module comprises an operational amplifier U4A and an operational amplifier U4B, the input end of the operational amplifier U4A is connected with the output end of the signal conversion chip U2, and the input end of the operational amplifier U4B is connected with the output end of the signal conversion chip U6.

[0013] In one of the embodiments, the circuit for setting the welding machine current and voltage by the robot controller further comprises a capacitor C13, a capacitor C25, a transient voltage suppression diode D2 and a transient voltage suppression diode D3, the capacitor C13 and the transient voltage suppression diode D2 are connected in parallel to the output end of the operational amplifier U4A, and the capacitor C25 and the transient voltage suppression diode D3 are connected in parallel to the output end of the operational amplifier U4B.

[0014] In one of the embodiments, the circuit for setting the welding machine current and voltage by the robot controller further comprises a power module, the power module is connected with the signal conversion module and the operational amplifier module respectively, and the power module is used for converting voltage and supplying power for the signal conversion module and the operational amplifier module.

[0015] In one of the embodiments, the power module comprises a DC-DC converter U1.

[0016] In one of the embodiments, the DC-DC converter U1 is of the model B2415LS.

[0017] The one or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:

[0018] The utility model provides a kind of circuit for robot controller sets welding machine current voltage, including main control module, opto-coupler isolation module, signal conversion module and operational amplifier module, main control module outputs two-way PWM signal, carries out isolation by opto-coupler isolation module, opto-coupler isolation module can keep the waveform and frequency characteristic of PWM signal, effectively isolate the electrical connection between input and output circuit, prevent interference and noise propagation, while, opto-coupler isolation module carries out isolation to PWM signal, avoid the influence of electromagnetic interference to PWM signal, ensure the integrity of signal in transmission process;Signal conversion module converts the PWM signal after isolation into analog signal, analog signal enters operational amplifier module by the way of differential input, operational amplifier module carries out buffering isolation to signal, signal conditioning, so that signal driving capacity is enhanced, there is good inhibitory effect for long distance signal attenuation problem, differential input can effectively reduce the error of signal source itself, when analog signal exists tiny voltage fluctuation, differential input can eliminate the influence caused by this fluctuation, to improve the precision and stability of signal, the output stage of operational amplifier module can provide larger current output, greatly enhanced the driving capacity to capacitor load. To realize the accurate setting of welding machine current voltage. The hardware connection of the scheme is simple, main control module only needs to output PWM signal to realize analog voltage signal conversion, without occupying SPI, I2C and other interfaces, save cost and software workload, the duty ratio of PWM signal can be quickly changed in main control module, compared with SPI or I2C and other communication interfaces based on complex protocol, data processing is simpler, and response is more rapid.

[0019] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, can be implemented according to the content of the specification, and in order to let the above and other purposes, characteristics and advantages of the utility model can be more obvious and easy to understand, the specific embodiment of the utility model is described below. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below, obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0021] Figure 1 It is the circuit module schematic diagram for the circuit for robot controller sets welding machine current voltage in the embodiment of the utility model;

[0022] Figure 2 It is the circuit principle schematic diagram for the circuit for robot controller sets welding machine current voltage in the embodiment of the utility model.

[0023] Figure 3 The utility model discloses a power module circuit principle schematic drawing for the circuit for robot controller sets up the welding machine current voltage of embodiment in the utility model.

[0024] Mark explanation: 100, main control module;200, optical coupling isolation module;300, signal conversion module;400, operational amplifier module;500, welding machine. Specific implementation

[0025] The utility model provides a technical scheme general idea as follows:

[0026] Please refer to Figure 1 The circuit for robot controller sets up the welding machine current voltage includes:

[0027] Main control module 100, main control module 100 is used to output PWM signal, specifically, the main function of main control module 100 is to generate PWM (pulse width modulation) signal, is used to control the current and voltage of welding machine 500, and main control module 100 calculates the duty ratio of corresponding PWM signal according to the voltage value of user input, and generates two-way PWM signal, can understand, and main control module 100 is usually composed of microcontroller (such as STM32 series single-chip microcomputer) or PLC (programmable logic controller), and the PWM signal generated by main control module 100 is output through the output end of main control module 100, and then is transmitted to optical coupling isolation module 200 to carry out isolation.

[0028] Optical coupling isolation module 200, the input end of optical coupling isolation module 200 is connected with the output end of main control module 100, and optical coupling isolation module 200 is used to isolate the PWM signal output by optical coupling isolation module 200, can understand, and optical coupling isolation module 200 is an electronic element that realizes electrical isolation using optical signal, and its main principle is to realize the signal isolation between input end and output end through the photoelectric conversion between light emitting diode (LED) and phototransistor (phototransistor), when input signal is added to LED, LED will emit optical signal, and the optical signal is received by phototransistor after isolation and is converted into electrical signal output, since there is no direct electrical connection between light emitting diode and phototransistor, therefore, electrical isolation between circuits can be realized, and interference and noise propagation are prevented.Optical coupling isolation module 200 can well maintain the waveform and frequency characteristics of PWM signal, and ensure the integrity of signal in the transmission process, and optical coupling isolation module 200 has higher common-mode rejection ratio, can effectively suppress common-mode interference signal, and optical coupling isolation module 200 uses optical signal for transmission, is not disturbed by electromagnetic field and electromagnetic wave, and has strong anti-interference ability.

[0029] The signal conversion module 300, the input end of the signal conversion module 300 is connected with the output end of the opto-isolator module 200, and the signal conversion module 300 is used for converting the PWM signal output by the opto-isolator module 200 into an analog signal; the core function of the signal conversion module 300 is to linearly convert the PWM (pulse width modulation) signal into a corresponding analog voltage signal. Specifically, the signal conversion module 300 converts the duty cycle of the input PWM signal into an analog voltage signal in a linear relationship with the duty cycle. For example, the signal conversion module 300 first detects the duty cycle of the input PWM signal, and then linearly converts the detected duty cycle into a corresponding analog voltage signal, for example, a PWM signal with a duty cycle of 50% will be converted into a 5V analog voltage signal

[0030] The operational amplifier module 400, the input end of the operational amplifier module 400 is connected with the output end of the signal conversion module 300, the analog signal output by the signal conversion module 300 enters the operational amplifier module 400 through differential input, and the operational amplifier module 400 buffers and isolates the analog signal and processes the signal. Specifically, the differential input method amplifies the signal by comparing the difference between two input signals (positive input and negative input) instead of directly amplifying a single signal, which can effectively reduce the error of the signal source itself, such as noise, drift and common-mode interference. The operational amplifier module 400 has the characteristics of high input impedance and low output impedance, can realize the buffering and isolation of the signal, and thus enhance the driving ability of the signal, prevent the signal from being affected by the load during transmission.

[0031] In summary, the circuit for setting current and voltage of a welding machine by a robot controller provided in the application comprises a master control module 100, an optical coupling isolation module 200, a signal conversion module 300 and an operational amplification module 400. The master control module 100 outputs two-way PWM signals, which are isolated by the optical coupling isolation module 200. The optical coupling isolation module 200 can maintain the waveform and frequency characteristics of the PWM signals, effectively isolate the electrical connection between the input and output circuits, prevent interference and noise propagation, and at the same time, isolate the PWM signals by the optical coupling isolation module 200, avoid the influence of electromagnetic interference on the PWM signals, and ensure the integrity of the signals in the transmission process. The signal conversion module 300 converts the isolated PWM signals into analog signals, which enter the operational amplification module 400 in the form of differential input. The operational amplification module 400 buffers and isolates the signals, signal conditioning, so that the signal driving capacity is enhanced, and has good inhibitory effect on the signal attenuation problem in long distance. Differential input can effectively reduce the error of the signal source itself. When there is a slight voltage fluctuation in the analog signal, differential input can eliminate the influence of such fluctuation, thereby improving the precision and stability of the signal. The output stage of the operational amplification module 400 can provide a large current output, greatly enhancing the driving capacity of the capacitive load. Thus, the current and voltage of the welding machine 500 are accurately set. The hardware connection of the scheme is simple. The master control module 100 only needs to output PWM signals to realize analog voltage signal conversion, without occupying SPI, I2C and other interfaces, saving cost and software workload. The duty ratio of the PWM signal can be quickly changed in the master control module 100. Compared with SPI or I2C and other communication interfaces based on complex protocols, data processing is simpler and response is more rapid.

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0033] Please refer to Figure 2The opto-coupling isolation module 200 includes opto-coupling U3 and opto-coupling U5, and the input ends of the opto-coupling U3 and the opto-coupling U5 are connected with two output ends of the master control module 100 for outputting PWM signals. Specifically, the master control module 100 generates two PWM signals, which are transmitted by the opto-coupling U3 and the opto-coupling U5 respectively. The opto-coupling U3 and the opto-coupling U5 are core elements of the opto-coupling isolation module 200, which are responsible for realizing electrical isolation and transmission of signals. The opto-coupling U3 and the opto-coupling U5 can usually adopt high-speed opto-couplings, such as the opto-coupling with the model number of ELM611, which has a response time of nanoseconds, can respond to changes in the input PWM signal faster, has high transmission rate, strong anti-interference ability, high common-mode rejection ratio, can effectively suppress common-mode interference signals, and can guarantee the stability and reliability of signal transmission and ensure the use in the complex electromagnetic environment of welding.

[0034] Please refer to Figure 2 The signal conversion module 300 includes signal conversion chips U2 and U6. The input end of the signal conversion chip U2 is connected with the output end of the opto-coupling U3, and the input end of the signal conversion chip U6 is connected with the output end of the opto-coupling U5. For example, the signal conversion chips U2 and U6 can adopt signal conversion chips with the model number of GP8101, which is a high-performance PWM signal conversion chip with high precision, fast response and wide applicability. The PWM signals isolated by the opto-coupling U3 and the opto-coupling U5 are input to the input ends of the signal conversion chips U2 and U6 respectively. According to the duty cycle of the detected PWM signal, the signal conversion chips U2 and U6 linearly convert it into a corresponding analog voltage signal.

[0035] Please refer to Figure 2, the operational amplification module 400 includes an operational amplifier U4A and an operational amplifier U4B, the input end of the operational amplifier U4A is connected with the output end of the signal conversion chip U2, and the input end of the operational amplifier U4B is connected with the output end of the signal conversion chip U6. The operational amplifier U4A and the operational amplifier U4B are the core elements of the operational amplification module 400, responsible for buffering and isolating the input analog signal, signal conditioning and amplification. The operational amplifier U4A and the operational amplifier U4B usually adopt high-precision operational amplifiers, such as TI's OPA series, Analog Devices' AD series, etc. The analog voltage signal converted by the signal conversion chip U2 and the signal conversion chip U6 is input to the input end of the operational amplifier U4A and the operational amplifier U4B respectively. The voltage range of the analog voltage signal is usually 0V to 5V or 0V to 10V, depending on the design of the signal conversion module 300. The output ends of the operational amplifier U4A and U4B are connected with two input ends of the control circuit of the welding machine 500 respectively, and the processed analog voltage signal is output to the control circuit of the welding machine 500 for controlling the current and voltage of the welding machine 500.

[0036] Please refer to Figure 2 , the circuit for setting the welding machine current and voltage of the robot controller further includes a capacitor C13, a capacitor C25, a transient voltage suppression diode D2, a transient voltage suppression diode D3, the capacitor C13 and the transient voltage suppression diode D2 are connected in parallel to the output end of the operational amplifier U4A, and the capacitor C25 and the transient voltage suppression diode D3 are connected in parallel to the output end of the operational amplifier U4B. Specifically, the capacitor C13 and the capacitor C25 have low impedance characteristics to high-frequency noise and ripple, which can effectively filter out these unwanted signal components. Through filtering, the output voltage fluctuation is reduced, and the signal is more stable, which is very important for precision control applications. When a transient voltage spike occurs at the output end, the transient voltage suppression diodes D2 and D3 will quickly conduct, clamping the overvoltage to a safe level (e.g., the breakdown voltage of the transient voltage suppression diode), which can prevent damage to the operational amplification module 400 and other sensitive circuits caused by transient voltage spikes.

[0037] Further, the circuit for setting the welding machine current and voltage of the robot controller further includes a power supply module, the power supply module is connected with the signal conversion module 300 and the operational amplification module 400 respectively, and the power supply module is used for converting voltage and supplying power to the signal conversion module 300 and the operational amplification module 400. Specifically, the main function of the power supply module is to convert the input power voltage into the voltage level required by the signal conversion module 300 and the operational amplification module 400, for example, converting the input 12V or 24V power into 5V or ±15V voltage, to meet the working voltage requirements of different modules.

[0038] Please refer to Figure 3 The power module includes a DC-DC converter U1 for converting an input DC voltage into a DC voltage required by the signal conversion module 300 and the operational amplification module 400, and the DC-DC converter U1 can adopt a DC-DC converter of a B2415LS series, the DC-DC converter module of the B2415LS series having the characteristics of high efficiency, isolation voltage and non-regulated output, and being suitable for a distributed power supply system requiring isolation voltage. The power module realizes voltage conversion and voltage stabilization filtering through the DC-DC converter U1 of the B2415LS series, and provides stable power supply for the signal conversion module 300 and the operational amplification module 400.

[0039] The utility model embodiment further provides a method for robot controller setting welding machine current voltage, and the method specifically comprises the following steps:

[0040] Receiving the voltage value input by the user;

[0041] According to the received input voltage value, the corresponding PWM signal duty cycle is calculated, and the PWM signal is generated;

[0042] The generated PWM signal is transmitted to the signal conversion module 300 through the optocoupler isolation module 200, and the signal conversion module 300 generates the corresponding analog voltage signal according to the received PWM signal;

[0043] The analog voltage signal output by the signal conversion module 300 is buffered and isolated through the operational amplification module 400, and the stable analog voltage signal is output.

[0044] Specifically, the user can input the corresponding voltage value through the man-machine interface (such as touch screen, keyboard or control software), according to the voltage value input by the user, the main control module 100 calculates the corresponding PWM signal duty cycle through the internal algorithm, and generates the corresponding PWM signal, the generated PWM signal is electrically isolated through the optocoupler isolation module 200, to prevent the electrical interference and noise propagation between the main control module 100 and the subsequent circuit, improve the stability and reliability of the system, the signal conversion chip (such as PWM to analog voltage chip) in the signal conversion module 300 converts the PWM signal duty cycle into an analog voltage signal linearly, the analog voltage signal output by the signal conversion module 300 is buffered and isolated through the operational amplification module 400, to enhance the driving ability of the signal, prevent the signal from being affected by the load in the transmission process. The operational amplification module 400 filters, amplifies and stabilizes the signal.

[0045] Further, the method further comprises:

[0046] The analog voltage signal output by the operational amplifier module 400 is transmitted to the input end of the welding machine 500, and is used as a current or voltage setting signal of the welding machine 500;

[0047] After receiving the current or voltage setting signal, the welding machine 500 sets the corresponding welding current or voltage and performs welding.

[0048] Specifically, the analog voltage signal is used as a current or voltage setting signal of the welding machine 500, and is used to set the specific working parameters of the welding machine. By changing the voltage value of the analog voltage signal, the different current or voltage outputs of the welding machine 500 can be adjusted, and the welding process can be accurately controlled. For example, there is a linear relationship between the voltage value of the analog voltage signal and the current or voltage setting value of the welding machine 500, for example: 0V corresponds to the minimum current or voltage, 10V corresponds to the maximum current or voltage, and the intermediate voltage value corresponds to the corresponding intermediate current or voltage value. When the analog voltage signal is used to control the current of the welding machine 500, the change of the voltage value will directly lead to the change of the output current of the welding machine 500, and when the analog voltage signal is used to control the voltage of the welding machine 500, the change of the voltage value will directly lead to the change of the output voltage of the welding machine 500. The analog voltage signal is a voltage signal, and its voltage value changes within a certain range, which is used to control the current or voltage of the welding machine.

[0049] Further, the method further comprises:

[0050] After receiving the current or voltage setting signal, the welding machine 500 displays the current welding current or voltage on the LED panel of the welding machine 500. Specifically, the welding machine 500 is usually equipped with a current sensor inside, which is used to monitor the actual welding current in real time. Similarly, the welding machine 500 is equipped with a voltage sensor inside, which is used to monitor the actual welding voltage in real time. The current and voltage sensors transmit the collected data to the control system of the welding machine 500, and the control system processes the collected data to convert it into a displayable value. The control system of the welding machine 500 sends the processed current or voltage value to the display driving circuit of the LED panel, and the LED panel displays the current welding current or voltage value in real time according to the received data. The operator can monitor the welding current and voltage in real time through the LED panel, and ensure that the welding process meets the expectations.

[0051] Further, the frequency of the PWM signal is fixed at 1KHz, and the duty cycle has a linear relationship with the input voltage. The input voltage range is 0V to 10V, and the duty cycle range is 0% to 100%. Specifically, there is a linear proportional relationship between the duty cycle and the input voltage, i.e. the change of the input voltage directly leads to the change of the duty cycle. The formula can be expressed as: duty cycle = (input voltage / maximum input voltage) x 100%. For example, when the input voltage is 5V, the duty cycle is 50%; when the input voltage is 10V, the duty cycle is 100%. The PWM signal realizes accurate and fast control through fixed frequency and linear relationship between duty cycle and input voltage. The input voltage range of 0V to 10V and the duty cycle range of 0% to 100% provide high-resolution control capability.

[0052] The following is an example analysis of the welding machine 500 voltage setting process, which aims to realize accurate setting of the welding machine 500 voltage through the teach pendant, the main control module 100, the opto-isolating module 200, the signal conversion module 300, and the operational amplifier module 400.

[0053] Suppose the welding current of a welding machine 500 needs to be set. First, the user enters the current-voltage matching interface in the welding process setting of the teach pendant. In this interface, the user inputs the desired voltage value corresponding to the current in the "analog quantity AO0(V)" input box, for example, inputs "1.2" to represent setting the welding current to 66A. Then, the user clicks the "analog quantity test" button to trigger the teach pendant to issue the command to the main control module 100 through the wired network. After receiving the command, the main control module 100 generates a PWM signal with a frequency of 1KHz and sets the corresponding duty cycle according to the input voltage value. For example, 1.2V corresponds to a duty cycle of 12% (because 0-10V corresponds to a duty cycle of 0-100%). The PWM signal is first subjected to electrical isolation by the opto-isolating module 200 to prevent interference and noise propagation, and then transmitted to the input end of the signal conversion module 300. The signal conversion module 300 linearly converts the PWM signal to an analog voltage signal of 1.2V, and then buffers and isolates the signal through the operational amplifier module 400 to ensure the stability and accuracy of the signal. Finally, the stable 1.2V voltage is transmitted to the input end of the welding machine 500 through the cable as the current given signal of the welding machine 500. After receiving the signal, the welding machine 500 sets the welding current to 66A according to the process parameters and working conditions, and displays the current welding machine 500 current as 66A on the LED panel.

[0054] Similarly in the current-voltage matching interface, the user can input a higher voltage value, for example, input "10" represents the set welding current is 550A. Click the "analog quantity test" button, the host module 100 generates a PWM signal with a duty cycle of 100%, through the optocoupler isolation module 200 and the signal conversion module 300, finally output 10V voltage as the current given signal of the welding machine 500, the welding machine 500 receives the 10V signal, sets the welding current to 550A, and displays the current welding machine 500 current as 550A on the LED panel.

[0055] Suppose the current welding voltage of a welding machine 500 is to be set, first, input the desired voltage value in the "analog quantity AO0(V)" input box, for example, input "1.2" represents the set welding voltage is 14.8V. Then, click the "analog quantity test" button, trigger the programmer to issue commands to the host module 100 through the wired network. After receiving the command, the host module 100 generates a PWM signal with a frequency of 1KHz, and sets the corresponding duty cycle according to the input voltage value. For example, 1.2V corresponds to a duty cycle of 12%. The PWM signal passes through the optocoupler isolation module 200 and is input to the input end of the signal conversion module 300. The signal conversion module 300 linearly converts the PWM signal to an analog voltage signal of 1.2V, which is then processed by the operational amplifier module 400, and finally outputs a stable 1.2V voltage through the cable to the input end of the welding machine 500 as the voltage given signal of the welding machine 500. After receiving the signal, the welding machine 500 sets the welding voltage to 14.8V according to the process parameters and working conditions, and displays the current welding machine 500 voltage as 14.8V on the LED panel.

[0056] Similarly in the current-voltage matching interface, the user can input a higher voltage value, for example, input "9.5" represents the set welding voltage is 47.4V. Click the "analog quantity test" button, the host module 100 generates a PWM signal with a duty cycle of 95%, through the optocoupler isolation module 200 and the signal conversion module 300, finally output 9.5V voltage as the voltage given signal of the welding machine 500. The welding machine 500 receives the 9.5V signal, sets the welding voltage to 47.4V, and displays the current welding machine 500 voltage as 47.4V on the LED panel.

[0057] In the welding process settings, the precise control of the current and voltage is achieved through the current / voltage graph, the user first enters the voltage current matching interface. In this interface, the user needs to input the minimum and maximum welding current values of the welding machine 500, i.e. 66A and 550A, in the two check boxes corresponding to the X axis (welding current) of the current / voltage graph respectively. At the same time, the voltage values corresponding to these current values, i.e. 1.2V and 10V, are input in the corresponding check boxes of the Y axis (input analog voltage). These values represent that when the analog voltage signal of 1.2V is input, the welding machine 500 needs to output the welding current of 66A; when the analog voltage signal of 10V is input, the welding machine 500 needs to output the welding current of 550A. After the input is completed, the user clicks the "save" button, and the system saves the current settings. In this way, the current setting of the welding machine 500 is completed, and it is ensured that the robot outputs the analog voltage of 1.2V-10V through the PWM signal, corresponding to the welding current range of 66A-550A of the welding machine 500.

[0058] Similarly, the user sets the voltage of the welding machine 500 in the current / voltage graph of the same interface. The user needs to input the minimum and maximum welding voltage values of the welding machine 500, i.e. 14.8V and 47.4V, in the two check boxes corresponding to the X axis (welding current). At the same time, the voltage values corresponding to these voltage values, i.e. 1.2V and 9.5V, are input in the corresponding check boxes of the Y axis (input analog voltage). These values represent that when the analog voltage signal of 1.2V is input, the welding machine 500 needs to output the welding voltage of 14.8V; when the analog voltage signal of 9.5V is input, the welding machine 500 needs to output the welding voltage of 47.4V. After the input is completed, the user clicks the "save" button, and the system saves the current settings. In this way, the voltage setting of the welding machine 500 is completed, and it is ensured that the robot outputs the analog voltage of 1.2V-9.5V through the PWM signal, corresponding to the welding voltage range of 14.8V-47.4V of the welding machine 500.

[0059] Through this precise setting process, the user can ensure that the welding machine 500 can work according to the expected current and voltage in different welding tasks, so as to ensure the welding quality and production efficiency.

[0060] Although the preferred embodiments of the present application have been described, those skilled in the art can make other changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including all changes and modifications falling within the scope of the present application.

[0061] Obviously, various modifications and variations of the present application embodiment can be made by those skilled in the art without departing from the spirit and scope of the present application embodiment. Thus, if these modifications and variations of the present application embodiment fall within the scope of the present application claims and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A circuit for a robot controller to set the current voltage of a welding machine, characterized by, include: The main control module is used to output PWM signals; An optocoupler isolation module is provided, wherein the input terminal of the optocoupler isolation module is connected to the output terminal of the main control module, and the optocoupler isolation module is used to isolate the PWM signal output by the optocoupler isolation module. A signal conversion module, wherein the input terminal of the signal conversion module is connected to the output terminal of the optocoupler isolation module, and the signal conversion module is used to convert the PWM signal output by the optocoupler isolation module into an analog signal; An operational amplifier module is provided, the input of which is connected to the output of the signal conversion module. The analog signal output by the signal conversion module enters the operational amplifier module through differential input. The operational amplifier module performs buffering, isolation, and signal conditioning on the analog signal.

2. The circuit for robot controller to set the welding machine current voltage of claim 1, wherein, The optocoupler isolation module includes optocoupler U3 and optocoupler U5, and the input terminals of optocoupler U3 and optocoupler U5 are respectively connected to the two output terminals of the main control module used to output PWM signals.

3. The circuit for a robot controller to set the welding machine current voltage of claim 2, wherein, The optocoupler U3 and the optocoupler U5 are model U5ELM611.

4. The circuit for robot controller to set the welding machine current voltage of claim 2, wherein, The signal conversion module includes signal conversion chip U2 and signal conversion chip U6. The input terminal of signal conversion chip U2 is connected to the output terminal of optocoupler U3, and the input terminal of signal conversion chip U6 is connected to the output terminal of optocoupler U5.

5. The circuit for a robot controller to set the welding machine current voltage of claim 4, wherein, The signal conversion chip U2 and the signal conversion chip U6 are model GP8101.

6. The circuit for robot controller to set the welding machine current voltage of claim 4, wherein, The operational amplifier module includes operational amplifier U4A and operational amplifier U4B. The input terminal of operational amplifier U4A is connected to the output terminal of signal conversion chip U2, and the input terminal of operational amplifier U4B is connected to the output terminal of signal conversion chip U6.

7. The circuit for robot controller to set the welding machine current voltage of claim 6, wherein, It also includes capacitor C13, capacitor C25, transient voltage suppression diode D2, and transient voltage suppression diode D3. The capacitor C13 and the transient voltage suppression diode D2 are connected in parallel to the output terminal of the operational amplifier U4A, and the capacitor C25 and the transient voltage suppression diode D3 are connected in parallel to the output terminal of the operational amplifier U4B.

8. The circuit for robot controller to set the welding machine current voltage of claim 1, wherein, Also includes: A power supply module is connected to both the signal conversion module and the operational amplifier module. The power supply module is used to convert voltage and provide power to the signal conversion module and the operational amplifier module.

9. The circuit for robot controller to set the welding machine current voltage of claim 8, wherein, The power module includes a DC-DC converter U1.

10. The circuit for a robot controller to set the welding machine current voltage of claim 9, wherein, The DC-DC converter U1 is model B2415LS.

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