Pulse interface circuit between PLC and TIG welding power source

Abstract

The utility model belongs to the technical field of welding power supply interface circuits, and particularly discloses a pulse interface circuit between a PLC (Programmable Logic Controller) and a TIG (Tungsten Inert Gas) welding power supply, which is characterized in that a pin 1 of an analog switch chip accesses a peak welding current input signal through a terminal 3 of a wiring terminal; a pin 5 of the analog switch chip is connected to a base value welding current input signal through a terminal 4 of the wiring terminal, a pin 10 of the analog switch chip is connected to a pulse width modulation signal through a terminal 1 of the wiring terminal, a pin 3 of the analog switch chip is electrically connected with one end of a voltage-regulator tube D4, and the other end of the voltage-regulator tube D4 is connected to a negative electrode of the power supply. According to the utility model, a pulse interface circuit is formed through the connection relation among the analog switch chip, the voltage-regulator tube, the resistor, the capacitor and the wiring terminal, so that a pulse width modulation signal PWM and an analog quantity signal of the PLC controller are converted into a pulse signal of a TIG welding power supply.

Description

Technical Field

[0001] The utility model relates to the technical field of welding power supply interface circuits, in particular to a pulse interface circuit between a PLC and a TIG welding power supply. Background Art

[0002] Automatic welding machine control systems typically use a PLC as the main controller. The TIG welding power supply receives analog signals from the PLC as the current reference signal. For ease of control and the needs of the welding process, the power supply's own parameter adjustment function is generally not used. To improve welding quality, pulsed current is often used during welding.

[0003] Currently, these automatic welding machine control systems either lack pulse current welding functionality or rely on analog conversion software to implement the pulse function. The first approach results in the welder lacking pulse welding functionality, impacting weld quality; the second approach, on the other hand, suffers from poor frequency and duty cycle accuracy, insufficiently steep pulse rise and fall edges, and complex programming. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problems existing in the background technology, and to this end, a pulse interface circuit between a PLC and a TIG welding power supply is provided.

[0005] In order to achieve the above purpose, the technical solutions adopted by this utility model are as follows:

[0006] A pulse interface circuit between a PLC and a TIG welding power source, comprising an analog switch chip and wiring terminals;

[0007] Pin 1 of the analog switch chip is electrically connected to terminal 3 of the wiring terminal, and terminal 3 of the wiring terminal is connected to the peak welding current input signal;

[0008] Pin 5 of the analog switch chip is electrically connected to terminal 4 of the wiring terminal, and terminal 4 of the wiring terminal is connected to the base value welding current input signal;

[0009] Pin 10 of the analog switch chip is electrically connected to terminal 1 of the wiring terminal, and terminal 1 of the wiring terminal is connected to the pulse width modulation signal;

[0010] Pin 3 of the analog switch chip is electrically connected to one end of the voltage regulator tube D4, and the other end of the voltage regulator tube D4 is connected to the negative electrode of the power supply.

[0011] The following is a technical solution further defined by the present invention: the pin 3 of the analog switch chip is electrically connected to the terminal 2 of the wiring terminal, and the terminal 2 of the wiring terminal is electrically connected to the input end of the TIG welding power supply as an output port.

[0012] The following is a technical solution further defined by the present invention, in which terminal 7, pin 6, and pin 5 of the wiring terminal are all connected to the negative pole of the power supply, and terminal 8 of the wiring terminal is connected to the positive pole of the power supply; a diode and a Zener diode D1 are connected between terminal 7 and pin 8 of the wiring terminal, and the diode and the Zener diode D1 are connected in parallel.

[0013] The following is a technical solution further defined by the present invention: the pin 10 of the analog switch chip is electrically connected to one end of the resistor, and the other end of the resistor is electrically connected to the positive electrode of the power supply.

[0014] The following is a technical solution further defined by the present invention: Pin 1 of the analog switch chip is electrically connected to one end of the voltage regulator tube D3, and the other end of the voltage regulator tube D3 is connected to the negative electrode of the power supply.

[0015] The following is a technical solution further defined by the present invention: the pin 5 of the analog switch chip is electrically connected to one end of the voltage regulator tube D2, and the other end of the voltage regulator tube D2 is connected to the negative electrode of the power supply.

[0016] The following is a technical solution further defined by the present invention: the pin 10 of the analog switch chip is electrically connected to one end of the voltage regulator tube D5, and the other end of the voltage regulator tube D5 is connected to the negative electrode of the power supply.

[0017] The following is a technical solution further defined by the present invention: Pin 6, Pin 9, and Pin 7 of the analog switch chip are all connected to the negative pole of the power supply.

[0018] The following is a technical solution further defined by the present invention: the base welding current set value and the peak welding current set value output by the PLC controller through the D / A conversion module are used as the peak welding current input signal and the base welding current input signal respectively.

[0019] The following is a technical solution further defined by the present invention, wherein the pulse width modulation signal is output by a PLC controller.

[0020] Compared with the prior art, the present invention has the following technical effects:

[0021] The utility model forms a pulse interface circuit by simulating the connection relationship between a switch chip, a voltage regulator tube, a resistor, a capacitor and wiring terminals, thereby converting the pulse width modulation signal PWM of the PLC controller and the analog signal into a pulse signal of the TIG welding power supply.

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a connection diagram of circuit components of the present utility model. DETAILED DESCRIPTION

[0025] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] like Figure 1 As shown, this embodiment provides a pulse interface circuit between a PLC and a TIG welding power supply, which is mainly composed of an analog switch chip model UTC4052, five voltage regulator tubes, a resistor, a capacitor, and an 8-pin terminal JP1.

[0027] The terminal definitions of terminal block JP1 are shown in the following table:

[0028]

[0029] The pin definitions of the UTC4052 analog switch chip are shown in the following table:

[0030] Pin number code name Name and function 13，3 X,Y Input / output common terminal 6 INH Prohibited input 7 <![CDATA[V EE ]]> Supply voltage 8 <![CDATA[V SS ]]> Chip power supply negative voltage 10，9 A,B Switch control input 12，14，15，11 X0~X3 X channel input / output 1，5，2，4 Y0~Y3 Y channel input / output 16 <![CDATA[V DD ]]> Chip power supply positive voltage

[0031] The PLC controller outputs the base welding current setpoint and peak welding current setpoint via the D / A conversion module as the peak welding current input signal and base welding current input signal, respectively. A pulse-width modulation signal is output by the PLC controller. It should be noted that the three signals (peak welding current input signal, base welding current input signal, and pulse-width modulation signal PWM) directly or indirectly output by the PLC controller to the pulse interface circuit do not involve control algorithms or program code. This utility model is intended only to facilitate understanding by those skilled in the art of the sources of the three signals (peak welding current input signal, base welding current input signal, and pulse-width modulation signal PWM).

[0032] Pin 1 of the analog switch chip is electrically connected to terminal 3 of the wiring terminal block, which receives the peak welding current input signal. Pin 5 of the analog switch chip is electrically connected to terminal 4 of the wiring terminal block, which receives the base welding current input signal. Pin 10 of the analog switch chip is electrically connected to terminal 1 of the wiring terminal block, which receives the pulse-width modulation signal. Pin 3 of the analog switch chip is electrically connected to one end of a Zener diode D4, the other end of which is connected to the negative terminal of the power supply. Pin 3 of the analog switch chip is electrically connected to terminal 2 of the wiring terminal block, which serves as an output port and is electrically connected to the input of the TIG welding power supply. Terminals 7, 6, and 5 of the wiring terminal block are all connected to the negative terminal of the power supply, while terminal 8 of the wiring terminal block is connected to the positive terminal of the power supply. A diode and a Zener diode D1 are connected between terminal 7 and pin 8 of the wiring terminal block, with the diode and Zener diode D1 connected in parallel. Pin 10 of the analog switch chip is electrically connected to one end of a resistor, the other end of which is electrically connected to the positive terminal of the power supply. Pin 1 of the analog switch chip is electrically connected to one end of the voltage regulator D3, and the other end of the voltage regulator D3 is connected to the negative terminal of the power supply. Pin 5 of the analog switch chip is electrically connected to one end of the voltage regulator D2, and the other end of the voltage regulator D2 is connected to the negative terminal of the power supply. Pin 10 of the analog switch chip is electrically connected to one end of the voltage regulator D5, and the other end of the voltage regulator D5 is connected to the negative terminal of the power supply. Pins 6, 9, and 7 of the analog switch chip are all connected to the negative terminal of the power supply.

[0033] Therefore, a pulse interface circuit is formed by connecting a UTC4052 analog switch chip, five voltage regulator diodes, a resistor, a capacitor, and an 8-pin terminal block (JP1). This circuit converts the PLC controller's pulse-width modulation (PWM) signal and analog signals (peak welding current input and base welding current input) into pulse signals for the TIG welding power supply. The voltage regulator diodes, resistors, and capacitors protect the circuit.

[0034] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any person skilled in the art can, without departing from the scope of the present invention, utilize the methods and technical content disclosed above to make many possible variations and modifications to the present invention, or modify it into equivalent embodiments with equivalent variations. Therefore, any equivalent variations based on the shape, structure, and principle of the present invention that do not depart from the content of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A pulse interface circuit between a PLC and a TIG welding power supply, characterized in that: Including analog switch chip and wiring terminals; Pin 1 of the analog switch chip is electrically connected to terminal 3 of the wiring terminal, and terminal 3 of the wiring terminal is connected to the peak welding current input signal; Pin 5 of the analog switch chip is electrically connected to terminal 4 of the wiring terminal, and terminal 4 of the wiring terminal is connected to the base value welding current input signal; Pin 10 of the analog switch chip is electrically connected to terminal 1 of the wiring terminal, and terminal 1 of the wiring terminal is connected to the pulse width modulation signal; Pin 3 of the analog switch chip is electrically connected to one end of the voltage regulator tube D4, and the other end of the voltage regulator tube D4 is connected to the negative electrode of the power supply.

2. The pulse interface circuit between a PLC and a TIG welding power source according to claim 1, characterized in that: The pin 3 of the analog switch chip is electrically connected to the terminal 2 of the wiring terminal, and the terminal 2 of the wiring terminal is electrically connected to the input end of the TIG welding power supply as an output port.

3. The pulse interface circuit between a PLC and a TIG welding power source according to claim 1, characterized in that: Terminal 7, pin 6, and pin 5 of the wiring terminal are all connected to the negative pole of the power supply, and terminal 8 of the wiring terminal is connected to the positive pole of the power supply; a diode and a voltage regulator D1 are connected between terminal 7 and pin 8 of the wiring terminal, and the diode and the voltage regulator D1 are connected in parallel.

4. The pulse interface circuit between a PLC and a TIG welding power source according to claim 1, characterized in that: The pin 10 of the analog switch chip is electrically connected to one end of the resistor, and the other end of the resistor is electrically connected to the positive electrode of the power supply.

5. The pulse interface circuit between a PLC and a TIG welding power source as claimed in claim 1, characterized in that: Pin 1 of the analog switch chip is electrically connected to one end of the voltage regulator tube D3, and the other end of the voltage regulator tube D3 is connected to the negative electrode of the power supply.

6. The pulse interface circuit between a PLC and a TIG welding power source as claimed in claim 1, characterized in that: Pin 5 of the analog switch chip is electrically connected to one end of the voltage regulator tube D2, and the other end of the voltage regulator tube D2 is connected to the negative electrode of the power supply.

7. The pulse interface circuit between a PLC and a TIG welding power source as claimed in claim 1, characterized in that: The pin 10 of the analog switch chip is electrically connected to one end of the voltage regulator tube D5, and the other end of the voltage regulator tube D5 is connected to the negative electrode of the power supply.

8. The pulse interface circuit between a PLC and a TIG welding power source as claimed in claim 1, characterized in that: Pins 6, 9 and 7 of the analog switch chip are all connected to the negative pole of the power supply.

9. The pulse interface circuit between a PLC and a TIG welding power source according to claim 1, characterized in that: The base welding current given value and the peak welding current given value output by the PLC controller through the D / A conversion module are used as the peak welding current input signal and the base welding current input signal respectively.

10. The pulse interface circuit between a PLC and a TIG welding power source according to claim 1, characterized in that: The pulse width modulation signal is output by a PLC controller.

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