CN111097993A - Signal isolation interface circuit and argon arc welding machine - Google Patents
Signal isolation interface circuit and argon arc welding machine Download PDFInfo
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- CN111097993A CN111097993A CN201911336514.3A CN201911336514A CN111097993A CN 111097993 A CN111097993 A CN 111097993A CN 201911336514 A CN201911336514 A CN 201911336514A CN 111097993 A CN111097993 A CN 111097993A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/095—Monitoring or automatic control of welding parameters
- B23K9/0953—Monitoring or automatic control of welding parameters using computing means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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Abstract
A connector transmits a control signal of an argon arc welding gun, a microcontroller samples the control signal, judges the type of the argon arc welding gun according to the physical parameters of the control signal and switches the function of a signal pin of the argon arc welding gun, so that the signal pin receives the control signal of the argon arc welding gun in real time, an optical coupling transmission circuit receives the control signal after signal processing by the microcontroller and outputs the control signal to a main control circuit, and the main control circuit correspondingly adjusts the working parameters of the argon arc welding gun according to the control signal. According to the signal isolation interface circuit and the argon arc welding machine, the type of the argon arc welding gun is identified through the microcontroller, and the function of the signal pin of the microcontroller is correspondingly adjusted so as to smoothly receive different types of control signals output by different argon arc welding guns, so that the same argon arc welding machine can be compatible with different types of argon arc welding guns, the cost for purchasing the argon arc welding machine is reduced, and the practicability is high; and a plurality of different function processing units are not required to be integrated, and the circuit structure is simple.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a signal isolation interface circuit and an argon arc welding machine.
Background
During welding, the argon arc welding machine and the argon arc welding gun must be matched for use. At present, in order to meet the requirement of a welder for performing remote control on various functions of an argon arc welding machine in the working process, such as parameter adjustment, parameter selection and the like, a plurality of argon arc welding gun manufacturers research and develop various argon arc welding guns with various multifunctional and different control modes, and two argon arc welding guns commonly used in the market are as follows: the argon arc welding gun comprises an argon arc welding gun with four functional keys and an argon arc welding gun with one functional key and one potentiometer adjusting knob. Therefore, it is necessary to improve the interface circuit of the argon arc welding machine so that the argon arc welding machine can be compatible with different types of argon arc welding guns. At present, the conventional interface circuit has the following problems: 1. because signal connector pins of different types of argon arc welding guns have different definitions, the number of the cores and the number of the pins of the interface cable used for designing the interface are large (see fig. 2) so as to be compatible with two types or even more of argon arc welding guns, and therefore the design cost of the interface is high and the assembly is complex; 2. in order to be compatible with argon arc welding guns with two functions, the traditional interface circuit needs to respectively design processing units with two functions (please refer to fig. 1), and the circuit design is complex, and the used devices are various and large in quantity; 3. because the types of signals output by different types of argon arc welding guns are different, the signals processed by the function processing unit are correspondingly different, for example, for the argon arc welding gun with the A function, the function processing unit processes the signals to obtain level signals, and for the argon arc welding gun with the B function, the function processing unit processes the signals to obtain analog signals, so that the types of the signals in the control circuit are multiple, the signal processing is complex, and the cost of the control circuit is higher; 4. the argon arc welding machine cannot automatically identify the type of the argon arc welding gun, so that a pin is required to be reserved in a signal interface, the type of the used argon arc welding gun is identified by connecting the pin corresponding to the control wire plug of the argon arc welding gun into the electric level, the connector plugs of the argon arc welding guns with different functions cannot be unified, the number of pins of the connector of the interface of the argon arc welding gun is large, and the cost is high.
Therefore, the conventional interface circuit scheme has the problems of complex circuit design and large number of used devices due to the need of integrating a plurality of different functional processing units in the interface circuit correspondingly for different types of argon arc welding guns.
Disclosure of Invention
In view of this, embodiments of the present invention provide a signal isolation interface circuit and an argon arc welding machine, which are intended to solve the problems of complicated circuit design and a large number of used devices caused by the need of integrating a plurality of different functional processing units in the interface circuit for different types of argon arc welding guns in the conventional interface circuit scheme.
A first aspect of an embodiment of the present invention provides a signal isolation interface circuit, including:
the connector is connected with different types of argon arc welding guns and is configured to be connected with control signals of the argon arc welding guns;
the microcontroller is provided with a plurality of signal pins, is connected with the connector and is configured to judge the type of the argon arc welding gun according to the physical parameters of the control signals and correspondingly switch the functions of the signal pins so that the signal pins receive the control signals of the argon arc welding gun in real time and process the signals; and
and the optical coupling transmission circuit is connected with the microcontroller and is configured to transmit the control signal after signal processing to the main control circuit so that the main control circuit correspondingly adjusts the working parameters of the argon arc welding gun according to the control signal.
Further, the connector is a five-hole connector, a first hole site, a second hole site, a third hole site and a fourth hole site of the five-hole connector are used for accessing the control signal, and a fifth hole site of the five-hole connector is grounded.
Further, the signal lines corresponding to the first hole site, the second hole site, and the third hole site are all multiplexing signal lines, and the multiplexing signal lines are configured to transmit the control signal to the microcontroller, so that the microcontroller switches the functions of the signal pins according to the control signal.
Further, the optical coupling transmission circuit includes:
the circuit comprises an optical coupler, a first resistor and a second resistor;
the first end of the first resistor is connected with the microcontroller, the second end of the first resistor is connected with the signal input end of the optical coupler, the signal output end of the optical coupler and the first end of the second resistor are connected with the main control circuit after being connected in common, and the second end of the second resistor is grounded.
Further, the optical coupling transmission circuit includes:
the PNP triode comprises an optical coupler, a third resistor, a fourth resistor and a PNP triode;
the optical coupler comprises a light emitting diode and a phototriode;
the base electrode of the PNP triode is connected with the microcontroller, the first end of the third resistor and the first end of the fourth resistor are connected in common and connected with a first direct current power supply signal, the second end of the third resistor is connected with the anode of the light-emitting diode, and the second end of the fourth resistor is connected with the base electrode of the PNP triode;
the cathode of the light emitting diode is connected with the emitting electrode of the PNP triode, and the collector of the PNP triode is grounded; and the collector of the phototriode is connected with a second direct-current power supply signal, and the collector of the phototriode is connected with the main control circuit and is grounded.
Further, the signal isolation interface circuit further includes:
an interface protection circuit connected between the connector and the microcontroller and configured to perform anti-static protection and anti-surge protection.
Further, the signal isolation interface circuit further includes:
and the filter circuit is connected between the interface protection circuit and the microcontroller and is configured to filter the control signal and output the control signal to the microcontroller.
Furthermore, the functions of the signal pins include signal sampling, signal input and signal output.
Furthermore, the control mode of each argon arc welding gun is to adopt one function key and one potentiometer adjusting knob for control, or adopt one function key and one digital encoder adjusting knob for control, or adopt any one of a plurality of function keys for control.
A second aspect of an embodiment of the present invention provides an argon arc welding machine, including:
the signal isolation interface circuit described above; and
and the main control circuit is connected with the second connector and correspondingly adjusts working parameters of the argon arc welding gun according to the control signal.
According to the signal isolation interface circuit and the argon arc welding machine, the type of the argon arc welding gun is identified through the microcontroller, and the function of the signal pin of the microcontroller is correspondingly adjusted so as to smoothly receive control signals of different types output by different argon arc welding guns, so that the same argon arc welding machine can be compatible with argon arc welding guns of different types, the cost for purchasing the argon arc welding machine is reduced, and the practicability is high; and a plurality of different function processing units are not required to be integrated, and the circuit structure is simple.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a conventional interface circuit;
FIG. 2 is a block diagram of a connector in a conventional interface circuit;
fig. 3 is a schematic structural diagram of a signal isolation interface circuit according to a first embodiment of the present invention;
FIG. 4 is an exemplary circuit schematic of the signal isolation interface circuit shown in FIG. 3;
FIG. 5 is a block diagram of a connector in the signal isolation interface circuit shown in FIG. 3;
fig. 6 is a schematic structural diagram of a signal isolation interface circuit according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a signal isolation interface circuit according to a third embodiment of the present invention;
fig. 8 is a schematic structural diagram of a signal isolation interface circuit according to a fourth embodiment of the present invention;
FIG. 9 is an exemplary circuit schematic of the signal isolation interface circuit shown in FIG. 8;
FIG. 10 is an exemplary circuit schematic of an optocoupler transmission circuit in the signal isolation interface circuit shown in FIG. 1;
FIG. 11 is a schematic structural diagram of an argon arc welding machine according to a fifth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 3, a schematic structural diagram of a signal isolation interface circuit according to a first embodiment of the present invention is shown, for convenience of description, only the relevant portions of the signal isolation interface circuit are shown, and the following details are described:
a signal isolation interface circuit comprises a connector CN1, a microcontroller 10 and an optical coupling transmission circuit 20.
The connector CN1 is connected to an argon arc welding gun, the microcontroller 10 is connected with the connector CN1 through a signal line, and the optical coupling transmission circuit 20 is connected with the microcontroller 10.
Connector CN1 is configured to receive a control signal from an argon arc welding gun.
The microcontroller 10 is provided with at least one sampling pin and a plurality of signal pins, wherein an outgoing line of the sampling pin is connected with an outgoing line of at least one of the signal pins in common and is used for sampling a voltage value of at least one point on the outgoing line of the signal pin connected in common, the sampling pin of the microcontroller 10 judges the type of the connected argon arc welding gun according to the level change of the sampled voltage value, and the voltage value is defined as a physical parameter of the control signal because the level change of the voltage value reflects the difference of the connected control signals. For example, when the sampled voltage values are 4.3V and 3V, the types of the argon arc welding guns respectively connected are different.
The microcontroller 10 is configured to determine the type of the argon arc welding gun according to the physical parameters of the control signal, and correspondingly switch the functions of the plurality of signal pins, so that the plurality of signal pins receive the control signal of the argon arc welding gun in real time, perform signal processing, and output the processed signal to the optical coupler transmission circuit 20.
The optical coupling transmission circuit 20 is configured to receive the control signal after signal processing, and output the control signal to the main control circuit 100 through the connector CN2, so that the main control circuit 100 correspondingly adjusts the working parameters of the argon arc welding gun according to the control signal.
Specifically, the signal isolation interface circuit is disposed in the argon arc welding machine, the argon arc welding gun is connected with the argon arc welding machine through the connector CN1, the operator operates the human-computer interaction module on the argon arc welding gun, so that the argon arc welding gun generates a control signal and transmits the control signal to the microcontroller 10 through the connector CN1, the microcontroller 10 first samples the control signal to identify the type of the argon arc welding gun, and then correspondingly switches the function of the signal pin thereof according to the type of the argon arc welding gun, so that the signal pins can receive the control signal of the argon arc welding gun in real time, the microcontroller 10 performs signal processing on the received control signal and outputs the signal to the optical coupling transmission circuit 20, the optical coupling transmission circuit 20 outputs the signal to the main control circuit 100 of the argon arc welding machine through the connector CN2, and the main control circuit 100 correspondingly adjusts the working parameters of the argon arc welding gun according to the control, finally, the effect that the working state of the argon arc welding gun is adjusted according to the actual working requirement of a worker is achieved. The operating parameters include, but are not limited to, any combination of operating current, operating duration, thrust current, ac frequency, pulse frequency, and pulse width.
The signal isolation interface circuit provided by the embodiment identifies the type of the argon arc welding gun through the microcontroller 10, and correspondingly adjusts the function of the signal pin so as to smoothly receive control signals of different types output by different argon arc welding guns, so that the same argon arc welding machine can be compatible with argon arc welding guns of different types, the cost for purchasing the argon arc welding machine is greatly reduced, and the practicability is high; and a plurality of different function processing units are not required to be integrated, and the circuit structure is simple.
When the physical parameters sampled by the sampling pin of the microcontroller 10 are in a first preset range, the microcontroller 10 judges that the argon arc welding gun is controlled by adopting a plurality of functional keys; when the physical parameter sampled by the sampling pin of the microcontroller 10 is within the second preset range, the microcontroller 10 determines that the argon arc welding gun is controlled by using a function key and a potentiometer adjusting knob.
Specifically, at present, there are a plurality of argon arc welding guns with different control modes on the market, the difference of the control modes is represented by the difference of human-computer interaction modules of the argon arc welding guns, and the difference of the control modes of the argon arc welding guns represents the difference of the types of the argon arc welding guns. Optionally, the argon arc welding gun in this embodiment is controlled by using one function button and one potentiometer adjusting knob (the human-computer interaction module is one function button and one potentiometer adjusting knob), or by using one function button and one digital encoder adjusting knob (the human-computer interaction module is one function button and one digital encoder adjusting knob), or by using any one of a plurality of function buttons (the human-computer interaction module is a plurality of function buttons), or by using other human-computer interaction modules.
In other optional embodiments, the physical parameter may also be a type of the control signal, that is, the sampling pin is used for analyzing whether the control signal is an analog signal or a digital signal through the sampling control signal, and the microcontroller 10 determines the type of the argon arc welding gun, and when the control signal is analyzed to be the digital signal, the microcontroller 10 determines that the connected argon arc welding gun is the argon arc welding gun which is numerically controlled through the display screen.
The signal isolation interface circuit provided by the embodiment is arranged in the argon arc welding machine, so that the argon arc welding machine can be respectively matched with argon arc welding guns of various types for use, the cost for purchasing the argon arc welding machines is greatly reduced, and the practicability is high; the signal isolation interface circuit realizes automatic identification of the type of the argon arc welding machine through sampling and analyzing the control signal, automatically switches the function of the signal pin of the microcontroller 10, does not need manual switching, and is convenient and quick.
Referring to fig. 4, a schematic diagram of an exemplary circuit of the signal isolation interface circuit shown in fig. 3 is shown, for convenience of description, only the parts related to the present embodiment are shown, and the details are as follows:
in an optional embodiment, the microcontroller 10 is implemented by a single chip microcomputer U1, and further includes a decoupling capacitor C1. The singlechip U1 has eight pins, wherein the 2 nd pin, the 4 th pin, the 5 th pin and the 6 th pin are signal pins, and the 7 th pin is a sampling pin; the 1 st pin is grounded, and the 8 th pin is a power supply pin and is connected with a +5V power supply; the 3 rd pin is a signal output pin and is connected with the optical coupling transmission circuit 20, and the 3 rd pin is used for outputting a control signal subjected to signal processing by the microcontroller 10 to the optical coupling transmission circuit 20.
The microcontroller 10 performs signal processing on the control signals, specifically, the control signals received by the plurality of signal pins are converted into digital signals and packaged, and then the digital signals are sent to the optocoupler transmission circuit 20 through the 3 rd pin in the form of information frames. The microcontroller 10 has an analog-to-digital conversion circuit therein.
Specifically, a sampling pin and a plurality of signal pins of the singlechip U1 are I/O pins, and have the functions of signal sampling, signal input and signal output. The microcontroller 10 switches the functions of the signal pins according to the type of the connected argon arc welding gun. In this embodiment, the function of the 7 th pin is fixed to signal sampling.
The argon arc welding gun can output various control signals which are respectively output to the No. 2 pin, the No. 4 pin, the No. 5 pin, the No. 6 pin and the No. 7 pin of the microcontroller 10 through the connector CN 1.
The control signal, either alone or in combination, may be used for a variety of welding parameter selection and adjustment, welding process control, with the optional parameters including, but not limited to, one or more of pre-blow time, start current, rise time, welding current, decay time, arc discharge current, post-blow time, ac frequency, cleaning width, pulse frequency, and pulse width, and the control effects of the control signal including, but not limited to, welding process start or stop, welding process state switching, changing the magnitude of the welding parameters.
The types of control signals output by the argon arc welding guns adopting different control modes are different. The 7 th pin through singlechip U1 samples control signal with the type of automatic identification argon arc welder to the function of automatic switch 2 nd pin, 4 th pin, 5 th pin and 7 th pin, thereby make foretell several signal pins receive the control signal by the argon arc welder output of access smoothly, need not the manual work and switch, convenient and practical, built-in this signal isolation interface circuit's argon arc welding machine commonality is strong.
In an alternative embodiment, the optical coupler transmission circuit 20 includes an optical coupler UA1, a first resistor R6, and a second resistor R12.
The first end of the first resistor R6 is connected to the microcontroller 10, the second end of the first resistor R6 is connected to the signal input end of the optical coupler UA1, the signal output end of the optical coupler UA1 and the first end of the second resistor R12 are connected to the main control circuit 100, and the second end of the second resistor R12 is grounded.
The optical coupler UA1 is formed by encapsulating a light emitting diode and a phototransistor, wherein the anode of the light emitting diode is used as the signal input end of the optical coupler UA1, and the emitter of the phototransistor is used as the signal output end of the optical coupler UA 1. After the control signal is input into the optical coupler UA1, the control signal is converted into an optical signal for transmission and then converted into an electrical signal for output, so that signal isolation is realized, phase-comparison mutual interference between the load and the back-end circuit and the main control circuit 100 at the front end is avoided, and stability is high.
The optical coupler transmission circuit 20 provided by the embodiment performs signal transmission through the single optical coupler UA1, and does not need a plurality of optical couplers UA1 to transmit various control signals respectively, so that components in the circuit are reduced, the circuit structure is simple, the occupied space of a circuit board is reduced, and the cost is reduced.
As shown in fig. 4, the outgoing line of the 7 th pin of the single chip microcomputer U1 is connected in common with the outgoing line of the 6 th pin, so that the 7 th pin is used as a sampling pin, and the physical parameters corresponding to the control signal accessed at the 1 st hole site are sampled.
Please refer to fig. 5, which is a structural diagram of the connector CN1 in the signal isolation interface circuit shown in fig. 3, for convenience of description, only the parts related to the embodiment are shown, and the detailed description is as follows:
in an alternative embodiment, connector CN1 is a five-hole connector having five holes including a first hole, a second hole, a third hole, a fourth hole, and a fifth hole (these five holes are denoted by 1, 2, 3, 4, and 5 in connector CN1 shown in fig. 4, 5, and 8, respectively).
Referring to fig. 4 and 5, the first hole site is connected to the 6 th pin and the 7 th pin of the mcu U1, the second hole site is connected to the 5 th pin of the mcu U1, the third hole site is connected to the 4 th pin of the mcu U1, and the fourth hole site is connected to the 2 nd pin of the mcu U1. The first hole site, the second hole site, the third hole site and the fourth hole site of the five-hole connector are used for transmitting control signals, and the fifth hole site is grounded. The control signal sampled by the 7 th pin of the single chip microcomputer U1 is input by the first hole site, and in other optional embodiments, the control signal input by sampling any one of the second hole site, the third hole site, and the fourth hole site by the 7 th pin may also be set.
In order to identify different types of argon arc welding guns, the current solution is to reserve one more pin/hole position on a connector for connecting a hole position/pin corresponding to a control line plug of the argon arc welding gun, and identify the type of the connected argon arc welding gun by detecting the level of the pin/hole position, but the connector CN1 provided by the embodiment does not need to reserve a hole position for identifying the type of the argon arc welding gun, and the identification work is executed by the microcontroller 10, so that the cost is saved.
The five-hole connector adopted by the embodiment can be round or long-strip-shaped, five hole sites can be arranged into a pentagram shape and a row, or can be arranged into two rows, three rows or even four rows, and the arrangement mode of the five hole sites does not influence the functions of the five hole sites.
In an optional embodiment, the signal lines corresponding to the first hole site, the second hole site, and the third hole site are all multiplexing signal lines, and the multiplexing signal lines are configured to transmit a control signal to the microcontroller 10, so that the microcontroller 10 switches the functions of the plurality of signal pins according to the control signal.
The multiplexing function of multiplexing signal lines is embodied as: when the connector CN1 is connected with argon arc welding guns of different types successively, the control signals transmitted successively through the first hole site are different, the control signals transmitted successively through the second hole site are different, the control signals transmitted successively through the third hole site are different, but the multiplexing signal lines can respectively transmit the input control signals.
The multiplexing function of the multiplexed signal lines is illustrated below with respect to table 1:
TABLE 1
As shown in Table 1, the argon arc welding gun A adopts four functional keys for parameter selection and parameter adjustment, and the argon arc welding gun B adopts one functional key and one potentiometer adjusting knob for parameter adjustment.
When the connector CN1 is connected to the argon arc welding gun a, the first hole site, the second hole site, the third hole site and the multiplexing signal lines corresponding to the three hole sites are respectively used for transmitting the parameter + signal, the parameter selection signal and the parameter-signal to the 6 th pin, the 5 th pin and the 4 th pin of the microcontroller 10, the three signals are respectively generated and output by the three function keys of the argon arc welding gun a, and the fourth function key is used for generating and outputting a gun switch signal.
The parameter selection signal is used for selecting the working parameter to be adjusted, the selected parameter comprises one or more of front gas feeding time, initial current, rising time, welding current, decay time, arc-extinguishing current, back gas feeding time, alternating current frequency, cleaning width, pulse frequency and pulse width, and the control effect of the control signal comprises but is not limited to starting or stopping of the welding process, switching of the state of the welding process and changing the size of the welding parameter. After the operator selects the parameters through the function keys, the operator adjusts the size of the selected parameters through the other two function keys to generate a parameter + signal to increase the selected parameters or generate a parameter-signal to decrease the selected parameters. And a fourth functional key of the argon arc welding gun A outputs a gun switching signal to a fourth hole position, the gun switching signal is transmitted to a No. 2 pin of the microcontroller 10 through the connector CN1, and the gun switching signal is used for controlling the switching of various welding state modes in the welding process of the argon arc welding gun and is also used for controlling the starting or stopping of the welding process of the argon arc welding gun.
When connector CN1 connects B argon arc welder, first hole site, second hole site and third hole site and the multiplexing signal line that these three hole sites correspond are used for transmitting potentiometre high-end signal, potentiometre low-end signal and potentiometre tap signal respectively, microcontroller 10's 6 th pin receives the potentiometre high-end signal, 4 th pin receives potentiometre low-end signal, the signal that the potentiometre was tapped is sampled to the 5 th pin, potentiometre high-end signal, potentiometre low-end signal and potentiometre tap signal are voltage signal, their value is along with the corresponding emergence of changing of potentiometre adjust knob's rotation. And B, outputting a gun switching signal to a fourth hole position by a functional key of the argon arc welding gun, and transmitting the gun switching signal to a No. 2 pin of the microcontroller 10 by a connector CN1, wherein the gun switching signal is used for controlling the switching of various welding state modes in the welding process of the argon arc welding gun and is also used for controlling the starting or stopping of the welding process of the argon arc welding gun.
In the signal isolation interface circuit provided by the embodiment, the microcontroller 10 analyzes and identifies the types of the argon arc welding guns by sampling the control signals, correspondingly adjusts the functions of the signal pins, and transmits different control signals output by the argon arc welding guns of different types by multiplexing the signal lines, so that one argon arc welding machine can be compatible with the argon arc welding guns of different types, and at least half of the signal lines are reduced; and a single microcontroller 10 is used for signal sampling, type identification, signal receiving and signal processing, so that the material cost is saved.
Alternatively, connector CN1 may be an at least five pin connector having at least five pins.
Referring to fig. 6, a schematic structural diagram of a signal isolation interface circuit according to a second embodiment of the present invention is shown, for convenience of description, only the relevant portions of the signal isolation interface circuit are shown, and the following details are described:
in an alternative embodiment, the signal isolation interface circuit further includes an interface protection circuit 30. The interface protection circuit 30 is connected between the connector CN1 and the microcontroller 10, and is configured to perform electrostatic protection and surge protection.
Specifically, the interface protection circuit 30 is connected to the chassis ground to lead static electricity to the ground, so as to prevent the static electricity from damaging the circuit and the argon arc welding machine.
Referring to fig. 7, a schematic structural diagram of a signal isolation interface circuit according to a third embodiment of the present invention is shown, for convenience of description, only the relevant portions of the signal isolation interface circuit are shown, and the following details are described:
in an optional embodiment, the signal isolation interface circuit further includes a filter circuit 40, and the filter circuit 40 is connected between the interface protection circuit 30 and the microcontroller 10, and configured to filter the control signal and output the control signal to the microcontroller 10.
Specifically, the filter circuit 40 performs bypass anti-interference and low-pass filtering on the high-frequency high-voltage signal coupled in the make signal and outputs the signal to the microcontroller 10.
Referring to fig. 8, a schematic structural diagram of a signal isolation interface circuit according to a fourth embodiment of the present invention is shown, for convenience of description, only the parts related to this embodiment are shown, and the following details are described:
in an optional embodiment, the signal isolation interface circuit shown in fig. 3 further includes an interface protection circuit 30 and a filter circuit 40, where the interface protection circuit 30 and the filter circuit 40 are both connected between the microcontroller 10 and a signal line interconnecting the connector CN1, the interface protection circuit 30 is configured to perform anti-static protection and anti-surge protection, and the filter circuit 40 is configured to filter the control signal and output the control signal to the microcontroller 10.
Referring to fig. 9, a schematic diagram of an exemplary circuit of the signal isolation interface circuit shown in fig. 8 is shown, for convenience of description, only the parts related to the present embodiment are shown, and the details are as follows:
in an optional embodiment, the interface protection circuit 30 includes a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C11, a transient suppression diode Z1, a transient suppression diode Z2, a transient suppression diode Z3, and a transient suppression diode Z4.
One end of the capacitor C7, the capacitor C8, the capacitor C9, the capacitor C10 and the capacitor C11 is connected with the chassis ground, and static electricity is introduced into the ground; the transient suppression diode Z1, the transient suppression diode Z2, the transient suppression diode Z3, and the transient suppression diode Z4 are connected in reverse to each signal line, and are used for preventing transient current from damaging the microcontroller 10.
In an alternative embodiment, the filter circuit 40 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, and a capacitor C6. The resistor R1, the capacitor C2, the resistor R2, the capacitor C3, the resistor R3, the capacitor C4, the resistor R4, the capacitor C5, the resistor R5 and the capacitor C6 respectively form an RC filter circuit 40, and high-frequency high-voltage signals coupled in control signals on each signal line are subjected to bypass anti-interference and low-pass filtering.
As shown in fig. 9, a first end of the resistor R1 is connected to a 7 th pin, i.e., a sampling pin, of the single chip microcomputer U1; the second end of the resistor R1 is connected to the connection line of the resistor R2 and the resistor R7, therefore, the 7 th pin of the single chip microcomputer U1 samples the voltage value between the resistor R2 and the resistor R7, the types of the connected argon arc welding guns are different, the control signals connected to the first hole site are different, the voltage value at the connection point of the corresponding resistor R2 and the resistor R7 is subjected to level change, the 7 th pin of the single chip microcomputer U1 is used as a sampling pin to sample the voltage value at the connection point, and the types of the argon arc welding guns are correspondingly judged. In this embodiment, the voltage value at the connection point of the resistor R2 and the resistor R7 is used as one of the physical parameters related to the control signal, and is used for the single chip microcomputer U1 to determine the type of the argon arc welding gun.
Fig. 10 is a schematic circuit diagram of an exemplary optical coupler transmission circuit in the signal isolation interface circuit shown in fig. 1, which only shows a portion related to the present embodiment for convenience of description, and the detailed description is as follows:
in an alternative embodiment, the optocoupler transmission circuit 20 includes an optocoupler UA2, a third resistor R12, a fourth resistor R13, and a PNP transistor Q4.
The optocoupler UA2 includes a light emitting diode and a phototransistor.
The base of the PNP triode Q4 is connected to the microcontroller, the first end of the third resistor R12 and the first end of the fourth resistor R13 are connected to the first dc power signal, the second end of the third resistor R12 is connected to the anode of the led, and the second end of the fourth resistor R13 is connected to the base of the PNP triode Q4.
The cathode of the light-emitting diode is connected with the emitting electrode of the PNP triode Q4, and the collector electrode of the PNP triode Q4 is grounded; and the collector of the phototriode is connected with a second direct current power supply signal, and the collector of the phototriode is connected with the main control circuit and is grounded.
Specifically, the first dc power signal and the second dc power signal are both +5V dc electrical signals, and the first dc power signal and the second dc power signal may be provided by the same power source or different power sources.
The optical coupler transmission circuit 20 provided by the embodiment performs signal transmission through the single optical coupler UA2, and does not need a plurality of optical couplers UA2 to transmit various control signals respectively, so that components in the circuit are reduced, the circuit structure is simple, the occupied space of a circuit board is reduced, and the cost is reduced.
Referring to fig. 11, a schematic structural diagram of an argon arc welding machine according to a fifth embodiment of the present invention is shown, for convenience of illustration, only the parts related to the embodiment are shown, and the details are as follows:
the interface circuitry is isolated from the main control circuitry 100 as described above. Specifically, the main control circuit 100 is connected to the signal isolation interface circuit through the connector CN2, and the main control circuit 100 correspondingly adjusts the working parameters of the argon arc welding gun according to the control signal.
In summary, the embodiment of the present invention provides a signal isolation interface circuit, which uses a microcontroller to identify the type of an argon arc welding gun and correspondingly adjust the function of a signal pin of the signal isolation interface circuit to smoothly receive different types of control signals output by different argon arc welding guns, so that the same argon arc welding machine can be compatible with different types of argon arc welding guns, the cost for purchasing the argon arc welding machine is greatly reduced, and the practicability is high; and a plurality of different function processing units are not required to be integrated, and the circuit structure is simple.
Various embodiments are described herein for various circuits and devices. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A signal isolation interface circuit, comprising:
the connector is connected with different types of argon arc welding guns and is configured to be connected with control signals of the argon arc welding guns;
the microcontroller is provided with a plurality of signal pins, is connected with the connector and is configured to judge the type of the argon arc welding gun according to the physical parameters of the control signals and correspondingly switch the functions of the signal pins so that the signal pins receive the control signals of the argon arc welding gun in real time and process the signals; and
and the optical coupling transmission circuit is connected with the microcontroller and is configured to transmit the control signal after signal processing to the main control circuit so that the main control circuit correspondingly adjusts the working parameters of the argon arc welding gun according to the control signal.
2. The signal isolation interface circuit of claim 1, wherein the connector is a five-hole connector, wherein a first hole site, a second hole site, a third hole site, and a fourth hole site of the five-hole connector are used for accessing the control signal, and a fifth hole site of the five-hole connector is grounded.
3. The signal isolation interface circuit of claim 2, wherein the signal lines corresponding to the first, second, and third holes are multiplexed signal lines configured to transmit the control signal to the microcontroller, such that the microcontroller switches the functions of the plurality of signal pins according to the control signal.
4. The signal isolation interface circuit of claim 1, wherein the optocoupler transmission circuit comprises:
the circuit comprises an optical coupler, a first resistor and a second resistor;
the first end of the first resistor is connected with the microcontroller, the second end of the first resistor is connected with the signal input end of the optical coupler, the signal output end of the optical coupler and the first end of the second resistor are connected with the main control circuit after being connected in common, and the second end of the second resistor is grounded.
5. The signal isolation interface circuit of claim 1, wherein the optocoupler transmission circuit comprises:
the PNP triode comprises an optical coupler, a third resistor, a fourth resistor and a PNP triode;
the optical coupler comprises a light emitting diode and a phototriode;
the base electrode of the PNP triode is connected with the microcontroller, the first end of the third resistor and the first end of the fourth resistor are connected in common and connected with a first direct current power supply signal, the second end of the third resistor is connected with the anode of the light-emitting diode, and the second end of the fourth resistor is connected with the base electrode of the PNP triode;
the cathode of the light emitting diode is connected with the emitting electrode of the PNP triode, and the collector of the PNP triode is grounded; and the collector of the phototriode is connected with a second direct-current power supply signal, and the collector of the phototriode is connected with the main control circuit and is grounded.
6. The signal isolation interface circuit of claim 1, further comprising:
an interface protection circuit connected between the connector and the microcontroller and configured to perform anti-static protection and anti-surge protection.
7. The signal isolation interface circuit of claim 6, further comprising:
and the filter circuit is connected between the interface protection circuit and the microcontroller and is configured to filter the control signal and output the control signal to the microcontroller.
8. The signal isolation interface circuit of claim 1, wherein the functions of the plurality of signal pins each include signal sampling, signal input, and signal output.
9. The signal isolation interface circuit according to claim 1, wherein each argon arc welding gun is controlled by one of a function key and a potentiometer adjusting knob, a digital encoder adjusting knob and a plurality of function keys.
10. An argon arc welding machine, characterized by comprising:
the signal isolation interface circuit of any one of claims 1 to 9; and
and the main control circuit is connected with the signal isolation interface circuit and correspondingly adjusts working parameters of the argon arc welding gun according to the control signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921987440 | 2019-11-18 | ||
| CN2019219874405 | 2019-11-18 |
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| CN111097993A true CN111097993A (en) | 2020-05-05 |
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| CN201922337557.5U Active CN211866833U (en) | 2019-11-18 | 2019-12-23 | Signal isolation interface circuit and argon arc welding machine |
| CN201911336514.3A Pending CN111097993A (en) | 2019-11-18 | 2019-12-23 | Signal isolation interface circuit and argon arc welding machine |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922337557.5U Active CN211866833U (en) | 2019-11-18 | 2019-12-23 | Signal isolation interface circuit and argon arc welding machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116075384A (en) * | 2022-10-25 | 2023-05-05 | 深圳市佳士科技股份有限公司 | Welding machine, welding gun, welding system and welding gun control method |
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2019
- 2019-12-23 CN CN201922337557.5U patent/CN211866833U/en active Active
- 2019-12-23 CN CN201911336514.3A patent/CN111097993A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116075384A (en) * | 2022-10-25 | 2023-05-05 | 深圳市佳士科技股份有限公司 | Welding machine, welding gun, welding system and welding gun control method |
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