Welding machine control circuit and lithium electric argon arc welding machine

Abstract

The utility model discloses a welding machine control circuit and a lithium electric argon arc welding machine, the lithium electric argon arc welding machine comprises a lithium battery, the welding machine control circuit is applied to the lithium electric argon arc welding machine, the welding machine control circuit comprises a main control circuit, the main control circuit comprises a first input end, a second input end, a first output end and a second output end, the first output end and the second output end are used for being electrically connected with a welding clamp and a workpiece to be welded respectively, the second input end is used for being electrically connected with a lithium battery, the voltage boosting and stabilizing circuit comprises a third input end and a third output end, the third output end is electrically connected with the first input end, and the voltage boosting and stabilizing circuit is used for inputting boosting voltage to the main control circuit. The main control circuit generates an arc striking voltage, superposes the arc striking voltage and the boost voltage, outputs the superposed voltage to the first output end, and switches the power output of the lithium battery to the first output end.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding machine technical field, especially a kind of welding machine control circuit and lithium electric argon arc welding machine. BACKGROUND

[0002] Argon arc welding technology is widely used in metal welding field, especially in pipeline, structural member and other occasions requiring high-quality welding is indispensable. The traditional argon arc welding machine usually uses mains power supply, which provides a safe and stable welding environment for industrial production. However, with the increasing demand for diversified production scenarios, some welding operations need to be carried out in the wild or in areas where power supply is not convenient. How to get rid of the dependence on mains power and obtain more convenient and efficient welding equipment has gradually become the focus of the industry.

[0003] The existing direct current argon arc welding machine is mainly divided into two types: the first type is based on silicon rectification, which requires the use of power frequency high-power transformer, resulting in large equipment size, heavy weight, inconvenient to move and carry, and low welding efficiency. At present, a few users still use it; the second type is an inverter type direct current argon arc welding machine, which is smaller, lighter and more efficient than the former, and is widely used in the market.

[0004] However, both types of welding machines need to be connected to mains power to work normally. Once welding operation is carried out in the wild or in areas where power supply is not convenient, the existing equipment has certain limitations in mobility and power supply demand. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a welding machine control circuit, which aims to solve the problem that the existing welding machine needs to be connected to mains power to work normally.

[0006] To achieve the above purpose, the utility model provides a welding machine control circuit applied to a lithium electric argon arc welding machine, which comprises:

[0007] A main control circuit, which comprises a first input end, a second input end and a first output end, a second output end, the first output end and the second output end are respectively used for electrically connecting welding tongs and a workpiece to be welded, and the second input end is used for electrically connecting the lithium battery;

[0008] A booster voltage stabilizing circuit, which comprises a third input end and a third output end, the third output end is electrically connected to the first input end, and the booster voltage stabilizing circuit is used for inputting booster voltage to the main control circuit;

[0009] Among them, the main control circuit generates an arc voltage and booster voltage superimposed output to the first output end, and switches the power output of the lithium battery to the first output end.

[0010] In some embodiments, the master control circuit comprises:

[0011] a switching module, which is electrically connected to the first input end and the second input end respectively, and comprises a first connecting end;

[0012] a switch control circuit, which comprises a second connecting end, a third connecting end and a fourth connecting end, the second connecting end is electrically connected to the first connecting end, the third connecting end and the fourth connecting end are electrically connected to the first output end and the second output end respectively;

[0013] an arc striking unit, which is electrically connected between the fourth connecting end and the second output end.

[0014] In some embodiments, the switching module comprises:

[0015] a first unidirectional conducting member, one end of which is electrically connected to the first input end, and the other end of which is electrically connected to the first connecting end;

[0016] a second unidirectional conducting member, one end of which is electrically connected to the second input end, and the other end of which is electrically connected to the first connecting end;

[0017] an energy storage module, one end of which is electrically connected to the first connecting end, and the other end of which is grounded.

[0018] In some embodiments, the switch control circuit comprises:

[0019] a power supply module, which comprises a first monitoring end and two first conducting ends, the first monitoring end is electrically connected to the third connecting end and the fourth connecting end, one of the first conducting ends is electrically connected to the second connecting end, and the other of the first conducting ends is electrically connected to the third connecting end;

[0020] a freewheeling module, which is electrically connected to the first conducting end, the third connecting end and the fourth connecting end respectively.

[0021] In some embodiments, the voltage boosting and stabilizing circuit comprises:

[0022] a pulse generation module, which comprises a fifth connecting end;

[0023] a switch module, which comprises a trigger end and two second conducting ends, the trigger end of the switch module is electrically connected to the fifth connecting end;

[0024] a voltage boosting unit, which comprises a control end and a fourth output end, one of the second conducting ends is electrically connected to the control end, the other of the second conducting ends is grounded, and the fourth output end is electrically connected to the third output end.

[0025] In some embodiments, further comprising a master control chip, the master control chip is electrically connected to the third input end, the master control chip is used for controlling the pulse generation module work.

[0026] In some embodiments, the voltage boosting and stabilizing circuit further comprises:

[0027] A rectifier filter circuit is electrically connected between the third output end and the fourth output end, and the rectifier filter circuit is used for rectifying and filtering the power supply input by the voltage boosting unit.

[0028] In some embodiments, the voltage boosting and stabilizing circuit further comprises:

[0029] A voltage feedback module comprises a second monitoring end and a feedback end, the second monitoring end is electrically connected between the rectifier filter circuit and the third output end, and the feedback end is electrically connected to the third input end.

[0030] In some embodiments, the voltage feedback module comprises an optical coupler and a plurality of Zener diodes, the optical coupler comprises two third conduction ends and two fourth conduction ends, one of the third conduction ends is electrically connected to a power supply, the other third conduction end is electrically connected to the feedback end, one of the fourth conduction ends is electrically connected to the third output end through a plurality of Zener diodes, and the other fourth conduction end is grounded.

[0031] The utility model further proposes a lithium electric argon arc welding machine, including electric lithium battery and the welding machine control circuit of preceding embodiment.

[0032] The utility model technical scheme has the advantages that: by setting the master control circuit and the voltage boosting and stabilizing circuit cooperate and work, high voltage is output at the same time and air gap is instantaneously broken down when arc striking, and arc is quickly established; in the welding stage, it is switched to low voltage direct current output powered by lithium battery, and the stable and continuous arc is realized. Therefore, on the one hand, the arc striking and welding process can be completed without connecting to the mains, which is suitable for the argon arc welding process requirement in the field operation scene; on the other hand, with the help of the voltage boosting and stabilizing circuit, the required high voltage or stable voltage can be flexibly and efficiently output, and the master control circuit is provided with the energy reserve for quickly establishing arc, thereby effectively solving the power supply problem of field direct current argon arc welding operation. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is the module electric connection schematic drawing of the welding machine control circuit in an embodiment of the utility model;

[0034] Figure 2 It is the partial circuit diagram of the welding machine control circuit in an embodiment of the utility model;

[0035] Figure 3The output waveform schematic diagram of the welding machine control circuit in an embodiment of the utility model is shown.

[0036] Figure 4 Part of the circuit diagram of the welding machine control circuit in an embodiment of the utility model is shown.

[0037] Explanation of reference numerals:

[0038] 10, main control circuit; A1, first input end; A2, second input end; B1, first output end; B2, second output end;

[0039] 100, switching module; E1, first connection end; D1, first unidirectional conducting part; D2, second unidirectional conducting part; 100a, energy storage module;

[0040] 110, switch control circuit; E2, second connection end; E3, third connection end; E4, fourth connection end;

[0041] 111, power-on module; B3, first monitoring end; B4, first conducting end;

[0042] 112, freewheeling module;

[0043] 120, arc striking unit;

[0044] 20, voltage boosting and stabilizing circuit; A3, third input end; A4, third output end;

[0045] 200, pulse generation module; E5, fifth connection end;

[0046] 210, switch module; A5, trigger end; B5, second conducting end;

[0047] 220, voltage boosting unit; B6, control end; B7, fourth output end;

[0048] 230, rectification and filtering circuit;

[0049] 240, voltage feedback module; A6, second monitoring end; A8, feedback end; U3, optocoupler; B8, third conducting end; B9, fourth conducting end; Z1, Zener diode;

[0050] U2, main control chip;

[0051] 300, lithium battery;

[0052] 400, welding tongs; 402, workpiece to be welded.

[0053] The utility model realizes the purpose, functional characteristics and advantages, which will be further explained in combination with embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0054] The schemes in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0055] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0056] It should also be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or can have a middle element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or can have a middle element.

[0057] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0058] With reference to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the embodiment of the present application proposes a welding machine control circuit, which is applied to a lithium electric argon arc welding machine. The lithium electric argon arc welding machine comprises a lithium battery 300, and the welding machine control circuit comprises:

[0059] a main control circuit 10, which comprises a first input end A1, a second input end A2, a first output end B1 and a second output end B2. The first output end B1 and the second output end B2 are respectively used for electrically connecting a welding clamp 400 and a workpiece to be welded 402. The second input end A2 is used for electrically connecting the lithium battery 300;

[0060] a supercharging voltage stabilizing circuit 20, which comprises a third input end A3 and a third output end A4. The third output end A4 is electrically connected to the first input end A1. The supercharging voltage stabilizing circuit 20 is used for inputting a supercharging voltage to the main control circuit 10;

[0061] Wherein, the master control circuit 10 generates the arc striking voltage and the supercharged voltage superimposed output to the first output terminal B1, and switches the power output of the lithium battery 300 to the first output terminal B1.

[0062] In the embodiment, the master control circuit 10 is mainly used to generate the arc striking voltage required by the welding machine, and control the output mode of the welding power supply in different time periods. Specifically, in the first time period, the master control circuit 10 can generate a higher arc striking voltage according to the pre-set arc striking parameters, and combine the supercharged voltage provided by the supercharged voltage stabilizing circuit 20 to output to the first output terminal B1, so as to quickly break the air gap between the electrode and the workpiece and achieve rapid arc striking. Then, in the second time period, the master control circuit 10 switches the power input, changes the welding power supply to be powered by the lithium battery 300 to output to the first output terminal B1, so as to realize the stable arc energy supply for the welding process.

[0063] In addition, the supercharged voltage stabilizing circuit 20 is mainly used to charge the switching module 100 in the master control circuit 10 in the embodiment. For example, the switching module 100 has an energy storage module 100a inside, and the supercharged voltage stabilizing circuit 20 establishes a voltage of about 100V to provide high-voltage arc striking power for subsequent arc striking work. The supercharged voltage stabilizing circuit 20 can be composed of high-frequency switch tube, boost inductor, rectifier diode and filter capacitor, and the specific implementation mode is to use high-frequency pulse switch mode boost, accumulate continuous or pulse current in the boost inductor, and then output stable high-voltage power through rectification and filtering link to charge the energy storage module 100a inside the master control circuit 10.

[0064] In the working process of the embodiment, first, the arc striking stage is entered, and the master control circuit 10 can output high-frequency or high-voltage arc striking voltage to the first output terminal B1 according to the pre-set arc striking program; at this time, the supercharged voltage stabilizing circuit 20 also provides supercharged voltage (about 100V) to the master control circuit 10, and the two are superimposed and jointly act on the welding tongs 400 and the workpiece to be welded 402 to quickly break the air gap and generate the initial arc. As the arc is formed and tends to be stable, the master control circuit 10 cuts off the connection with the supercharged voltage stabilizing circuit 20 in the second time period, and switches the main power output of the lithium battery 300 to the first output terminal B1 to provide stable and continuous arc energy for the subsequent welding process. The molten pool formed between the welding rod and the workpiece is continuously heated by the direct current power output by the lithium battery 300, so as to realize continuous welding and ensure the stability of the welding seam and the arc.

[0065] The beneficial effects of the technical scheme of the utility model lie in: through setting the main control circuit 10 and the pressure boosting and voltage stabilizing circuit 20 cooperating, high voltage is outputted at the same time and the air gap is instantaneously broken down when the arc is drawn, and the electric arc is quickly established; in the welding stage, the low voltage direct current output is switched to the power supply of the lithium battery 300, and the stable and continuous electric arc is realized. Thus, on the one hand, the electric arc drawing and welding process can be completed without connecting to the commercial power, and the argon arc welding process requirement under the field operation scene is suitable; on the other hand, with the high frequency switch tube, the boost inductor, the rectifier diode and the filter capacitor and other devices in the pressure boosting and voltage stabilizing circuit 20, the required high voltage or stable voltage can be flexibly and efficiently outputted, the energy reserve for the main control circuit 10 to quickly establish the electric arc is provided, and thus the problem of difficult power supply for the field direct current argon arc welding operation is effectively solved.

[0066] Continuing to refer to Figure 2 In the embodiment, the main control circuit 10 comprises:

[0067] The switching module 100 is electrically connected with the first input end A1 and the second input end A2 respectively, and comprises the first connecting end E1.

[0068] The switch control circuit 110 comprises the second connecting end E2, the third connecting end E3 and the fourth connecting end E4, the second connecting end E2 is electrically connected with the first connecting end E1, and the third connecting end E3 and the fourth connecting end E4 are electrically connected with the first output end B1 and the second output end B2 respectively.

[0069] The arc drawing unit 120 is electrically connected between the fourth connecting end E4 and the second output end B2.

[0070] In the embodiment, the main control circuit 10 is composed of the switching module 100, the switch control circuit 110 and the arc drawing unit 120. Specifically, the switching module 100 is electrically connected with the first input end A1 and the second input end A2 respectively and comprises the first connecting end E1; the switch control circuit 110 comprises the second connecting end E2, the third connecting end E3 and the fourth connecting end E4, the second connecting end E2 is electrically connected with the first connecting end E1 of the switching module 100, and the third connecting end E3 and the fourth connecting end E4 are electrically connected with the first output end B1 and the second output end B2 respectively; and the arc drawing unit 120 is arranged between the fourth connecting end E4 and the second output end B2, and realizes the voltage and current regulation in the arc drawing and welding process through the synergistic effect with the switch control circuit 110.

[0071] The switching module 100 mainly serves as a power switching function in this embodiment: in the arc starting stage, the switching module 100 switches the boost voltage from the first input terminal A1 (connected to the boost stabilizing circuit 20) to the switching control circuit 110, which can output a preset frequency and duty cycle to the first output terminal B1, and superimposes the arc starting voltage provided by the arc starting unit 120, so as to achieve rapid breakdown of the air gap; in the welding stage, the switching module 100 switches to the second input terminal A2 (connected to the lithium battery 300), and provides the DC voltage of the lithium battery 300 to the switching control circuit 110, so that the subsequent welding process can obtain stable and continuous energy supply.

[0072] When the welding operation needs to be started, the boost stabilizing circuit 20 first charges the energy storage unit in the switching module 100 through the first input terminal A1 to establish the required high voltage. When the predetermined condition is met, the switching module 100 connects the first input terminal A1 (output of the boost stabilizing circuit 20) to the first connection terminal E1, and outputs a pulse high voltage with a certain frequency and duty cycle to the first output terminal B1 through the switching control circuit 110. At the same time, the arc starting unit 120 also outputs an arc starting voltage from the fourth connection terminal E4 to the second output terminal B2, so that the two are superimposed and applied between the welding clamp 400 (first output terminal B1) and the workpiece (second output terminal B2). Through the joint action of the pulse high voltage and the arc starting voltage, the air gap between the workpiece and the electrode (or welding wire) is rapidly broken down, and the arc starting is successfully established.

[0073] After the arc starting is completed and stabilized, the main control circuit 10 determines that it needs to provide continuous welding energy, at which time the switching module 100 disconnects the first input terminal A1 and connects the lithium battery 300 (second input terminal A2) to the first connection terminal E1. Then, the DC voltage output by the lithium battery 300 is output to the first output terminal B1 through the switching control circuit 110, to provide smooth energy for the welding arc. The switching control circuit 110 can continue to work in a preset switching mode in this stage, to ensure the smoothness and controllability of the output current and voltage, so as to maintain the stable combustion of the arc and meet the requirements of various welding processes.

[0074] In order to improve the starting efficiency and output stability, the switching control circuit 110 can be combined with a high-frequency switching device and a suitable driving circuit, and can be combined with a filter inductor or a filter capacitor, to respectively realize rapid arc starting and smooth welding in different working stages.

[0075] The arc starting unit 120 in this embodiment can include a high-frequency oscillator, a high-voltage coupling capacitor, etc., which is used to apply a high-frequency or high-voltage electrical signal to the arc gap in the initial stage of arc starting, to improve the arc starting success rate and shorten the arc starting time.

[0076] The switching module 100 can be equipped with dedicated energy storage or protection components (such as energy storage capacitors, MOSFETs or IGBTs) to improve the utilization efficiency of the boost and voltage regulation circuit 20 during the charging phase and to prevent current overshoot from damaging the components during the switching phase.

[0077] Through the modular design described above, this embodiment can efficiently complete the entire process from arc ignition to welding in outdoor environments without mains power, meeting the comprehensive requirements of portable welding equipment for portability, stability, and efficiency. Therefore, while ensuring the performance of traditional arc welding, this embodiment significantly improves adaptability to the power supply environment, effectively solving the power supply problem during outdoor DC TIG welding operations.

[0078] Furthermore, the switching module 100 includes:

[0079] The first unidirectional conductor D1 has one end electrically connected to the first input terminal A1 and the other end electrically connected to the first connection terminal E1.

[0080] The second unidirectional conductor D2 has one end electrically connected to the second input terminal A2 and the other end electrically connected to the first connection terminal E1.

[0081] Energy storage module 100a, one end of which is electrically connected to the first connection terminal E1, and the other end is grounded.

[0082] In this embodiment, the switching module 100 includes a first unidirectional conducting element D1, a second unidirectional conducting element, and an energy storage module 100a. Both the first unidirectional conducting element D1 and the second unidirectional conducting element can be implemented using diodes (e.g., ...). Figure 2 As shown in the diagram, its input terminals are respectively connected to the first input terminal A1 and the second input terminal A2, and its output terminals are all connected to the first connection terminal E1. This allows it to supply power from the booster / regulator circuit 20 or the lithium battery 300 to the switch control circuit 110 at different operating stages. Furthermore, the energy storage module 100a can consist of two capacitors, exemplarily C1 (a large-capacity electrolytic capacitor used for low-frequency filtering and energy storage) and C2 (a high-frequency filtering capacitor used to suppress high-frequency ripple). One end of each capacitor is connected to the first connection terminal E1, and the other end is grounded. Through this structural design, the switching module 100 can complete power switching and charging energy storage during the arc ignition and welding stages, thereby providing necessary and stable power support for subsequent switch control and arc ignition processes.

[0083] Furthermore, the switch control circuit 110 includes:

[0084] The power-on module 111 includes a first monitoring terminal B3 and two first conduction terminals B4. The first monitoring terminal B3 is electrically connected to the third connection terminal E3 and the fourth connection terminal E4. One of the first conduction terminals B4 is electrically connected to the second connection terminal E2, and the other first conduction terminal B4 is electrically connected to the third connection terminal E3.

[0085] The freewheeling module 112 is electrically connected to the first conduction terminal B4, the third connection terminal E3 and the fourth connection terminal E4 respectively.

[0086] In this embodiment, the switch control circuit 110 includes the power-on module 111 and the freewheeling module 112. The power-on module 111 can be composed of a triode Q1, a matching power device driving circuit, a PWM control circuit and a shunt FLQ, etc. The freewheeling module 112 is electrically connected to the relevant terminals and output terminals of the power-on module 111 respectively, and is used to provide a continuous path for the current when the switching device is turned off.

[0087] Specifically, the power-on module 111 includes a first monitoring terminal B3 and two first conduction terminals B4. The first monitoring terminal B3 is electrically connected to the third connection terminal E3 and the fourth connection terminal E4. The two first conduction terminals B4 are connected to the second connection terminal E2 and the third connection terminal E3 respectively. When the triode Q1 receives the power device driving and PWM control signals, the on-off frequency and duty cycle of the triode Q1 will change according to the system settings, thereby realizing pulse output control of the boost voltage or the lithium battery 300 power supply. In order to monitor the output in real time, the shunt FLQ is arranged at the first monitoring terminal B3, which is used to collect the output voltage or current signal and feed back to the PWM control circuit. If the voltage of the first output terminal B1 is lower than the expected value, the PWM control circuit will increase the on-duty of the triode Q1 accordingly, and increase the output power. If the voltage of the first output terminal B1 is higher than the expected value, the on-duty of the triode Q1 will be reduced, and the output power will be reduced, so as to realize accurate control of the welding arc energy.

[0088] The freewheeling module 112 cooperates with the power-on module 111 to provide a current freewheeling path during the triode Q1 is turned off, thereby ensuring the smooth transition of the load (welding end) current and voltage, and reducing the fluctuation of the output waveform. At the same time, by means of the organic combination of the power-on module 111 and the freewheeling module 112, in the process of realizing fast arc striking and stable welding, the output voltage and current can be efficiently adjusted according to the feedback data, and the voltage peak and current overshoot can be effectively suppressed in different working stages, thereby improving the safety and stability of the system as a whole.

[0089] Referring to Figure 4 In this embodiment, the boost voltage stabilizing circuit 20 includes:

[0090] The pulse generation module 200 includes a fifth connection terminal E5.

[0091] The switch module 210 includes a trigger terminal A5 and two second conduction terminals B5. The trigger terminal A5 of the switch module 210 is electrically connected to the fifth connection terminal E5.

[0092] The boost unit 220 includes a control terminal B6 and a fourth output terminal B7. The control terminal B6 is electrically connected to a second conducting terminal B5, and the other second conducting terminal B5 is grounded. The fourth output terminal B7 is electrically connected to a third output terminal A4.

[0093] In this embodiment, the boosting and regulating circuit 20 consists of a pulse generation module 200, a switching module 210, and a boost unit 220. Specifically, the pulse generation module 200 includes a fifth connection terminal E5, which can be used to output high-level pulse control signals with different frequencies and duty cycles. The switching module 210 includes a trigger terminal A5 and two second conducting terminals B5, wherein the trigger terminal A5 is electrically connected to the fifth connection terminal E5. When it receives the control signal from the pulse generation module 200, it can turn on or off accordingly to drive the boost unit 220 to work. The boost unit 220 includes a control terminal B6 and a fourth output terminal B7. The control terminal B6 is connected to one of the second conducting terminals B5 of the switching module 210, and the other second conducting terminal B5 is grounded. The fourth output terminal B7 serves as the third output terminal A4 of the boosting and regulating circuit 20, used to output a stable boost voltage to charge the energy storage module 100a (or subsequent circuits).

[0094] In practical design, the switching module 210 can be selected from NMOS transistors ( Figure 4 The input power can be boosted and regulated using a transformer and a rectifier / filter, or other suitable power switching device (such as a PMOS transistor). The boost unit 220 can utilize a transformer in conjunction with a rectifier / filter to achieve this. The pulse generation module 200 can be based on a PWM chip, a microcontroller, or a dedicated pulse generator. By controlling the frequency and duty cycle of the pulse signal, the switching module 210 can be turned on or off under different operating conditions, allowing the transformer to output the target voltage under high-frequency pulse excitation, which is then rectified and filtered to generate stable high-voltage power. This boost and regulated circuit 20 effectively provides the required high-voltage power to the energy storage module 100a or the main control circuit 10, meeting the needs of rapid arc initiation and subsequent stable power supply.

[0095] Continue reading Figure 4 In this embodiment, a main control chip U2 is also included. The main control chip U2 is electrically connected to the third input terminal A3 and is used to control the pulse generation module 200 to work.

[0096] In the embodiment, the welding machine control circuit further comprises a master control chip U2, which is electrically connected to the third input end A3 and can send control instructions to the pulse generation module 200 according to the preset working mode of the system and the welding process requirements. Specifically, the master control chip U2 can be selected from a microcontroller (MCU), an FPGA or a special PWM controller, and the frequency, duty ratio and phase of the output pulse signal and other parameters can be set through the internal program. When arc striking or welding is needed, the master control chip U2 sends a control signal to the pulse generation module 200 through the third input end A3, instructing the pulse generation module 200 to output a high-level pulse signal, so as to periodically turn on or turn off the switch module 210 and realize effective control of the boost unit 220.

[0097] For example, when it is detected that a higher arc striking voltage is needed, the master control chip U2 can increase the duty ratio and increase the pulse frequency to improve the boost efficiency; if it is in the stable welding stage, the duty ratio or the pulse frequency can be appropriately reduced to make the output voltage and current stable and controllable. In this way, the master control chip U2 can flexibly adjust the output characteristics of the boost and voltage stabilization circuit 20, cooperate with the aforementioned energy storage module 100a and the master control circuit 10, and jointly complete the whole process from fast arc striking to stable welding.

[0098] Further, the boost and voltage stabilization circuit 20 further comprises a rectifier and filter circuit 230, which is electrically connected between the third output end A4 and the fourth output end B7, and is used for rectifying and filtering the power input by the multiple boost units 220.

[0099] Continuing to refer to Figure 4 In the embodiment, the boost and voltage stabilization circuit 20 further comprises:

[0100] A voltage feedback module 240, comprising a second monitoring end A6 and a feedback end A8, the second monitoring end A6 is electrically connected between the rectifier and filter circuit 230 and the third output end A4, and the feedback end A8 is electrically connected to the third input end A3.

[0101] In the embodiment, the boost and voltage stabilization circuit 20 further comprises a voltage feedback module 240, which comprises a second monitoring end A6 and a feedback end A8, the second monitoring end A6 is connected between the rectifier and filter circuit 230 and the third output end A4, for real-time detection of the output voltage of the third output end A4, and the feedback end A8 is connected with the third input end A3, so as to transmit the detected voltage information to the pulse generation module 200 (or the master control chip U2).

[0102] In a normal working condition, when the voltage feedback module 240 monitors that the voltage of the third output end A4 reaches or exceeds the preset threshold value, it will feed back a signal to the pulse generation module 200 through the third input end A3, so as to trigger the pulse generation module 200 to control the switch module 210 to be turned off, and stop the boost unit 220 from continuing to work, thereby avoiding damage to components or unstable performance caused by excessively high output voltage. At the same time, after the voltage drops to a safe range, the pulse generation module 200 can send a conduction signal again, so that the switch module 210 reworks and drives the boost unit 220 to output a boosted voltage. Through the above voltage feedback control mechanism, the boost and voltage stabilization circuit 20 of the embodiment can be maintained in an ideal working interval, achieving high-voltage output and effectively guaranteeing the reliability and safety of the system.

[0103] Specifically, the voltage feedback module 240 includes an optocoupler U3 and a plurality of Zener diodes Z1. The optocoupler U3 includes two third conducting ends B8 and two fourth conducting ends B9. One third conducting end B8 is electrically connected to a power supply, and the other third conducting end B8 is electrically connected to a feedback end A8. One fourth conducting end B9 is electrically connected to the third output end A4 through the plurality of Zener diodes Z1, and the other fourth conducting end B9 is grounded.

[0104] In the embodiment, in order to realize accurate monitoring of the boosted voltage and timely feedback to the control end B6, the voltage feedback module 240 adopts a structure combining an optocoupler U3 (optoelectronic coupler) and a plurality of Zener diodes Z1. The optocoupler U3 includes two third conducting ends B8 and two fourth conducting ends B9. One third conducting end B8 is connected to a system power supply, and the other third conducting end B8 is connected to a feedback end A8 (to feed back a signal at an output end of the optocoupler U3 to a main control chip U2 or a pulse generation module 200). Meanwhile, one fourth conducting end B9 is connected to a third output end A4 in a series or parallel connection mode of the plurality of Zener diodes Z1, and the other fourth conducting end B9 is directly grounded.

[0105] In actual work, when the boosted voltage of the third output end A4 is lower than the voltage stabilizing threshold of the Zener diode Z1, the Zener diode Z1 is in an off or low current conduction state, the light emitting diode (LED) inside the optocoupler U3 cannot obtain sufficient current, and then the light sensitive receiver (light sensitive triode or light sensitive diode) corresponding to the output end of the optocoupler U3 cannot be turned on, so that the signal received by the feedback end A8 is in a low level or non-triggering state. On the contrary, when the voltage of the third output end A4 reaches or exceeds the voltage stabilizing threshold formed by the series / parallel connection of the plurality of Zener diodes Z1, the Zener diode Z1 starts to be stably conducted, the current flows through the input end of the optocoupler U3, and the corresponding electrical signal is generated at the output end of the optocoupler U3. The signal is transmitted to the main control chip U2 or the pulse generation module 200 through the feedback end A8 and the third conduction end B8, indicates that the current voltage has exceeded the set range, and thus triggers the switch module 210 to be turned off in time, and the boosting unit 220 stops working.

[0106] Through the cooperative design of the optocoupler U3 and the Zener diode Z1, not only can the safe and reliable potential isolation be realized in the high voltage environment, but also the voltage threshold can be accurately set according to the selection and combination of the plurality of Zener diodes Z1, so that the boosting and voltage stabilizing circuit 20 automatically enters the voltage stabilizing or limiting state after reaching the required high voltage, and the overall working efficiency and safety are improved. Meanwhile, the optocoupler U3 can isolate the influence of the abnormal voltage on the subsequent devices of the third input end A3.

[0107] The utility model further proposes a kind of lithium electric argon arc welding machine, including electric lithium battery 300 and the welding machine control circuit as described in preceding embodiment. The specific structure of the welding machine control circuit refers to the above embodiment, since the lithium electric argon arc welding machine of the utility model adopts all technical solutions of all above embodiments, it at least has all technical effects brought by the technical solutions of above embodiments, which will not be repeated here. Among them, the welding machine control circuit realizes fast arc establishment and smooth power supply by boosting and voltage stabilizing circuit 20 and switching module 100 respectively in arc striking and welding stage, and can provide efficient and stable argon arc welding operation in field or no mains environment by combining the feedback regulation capability of switch control circuit 110. Therefore, by the high energy density and portable characteristics of lithium battery 300, the lithium electric argon arc welding machine can work normally without being connected to mains, which significantly improves the flexibility and convenience of outdoor welding operation, and has the advantages of fast arc striking, stable arc and energy control.

[0108] The above only describes some or preferred embodiments of the utility model, neither the text nor the drawings can limit the scope of protection of the utility model, equivalent structural transformation using the contents of the utility model specification and drawings, or direct / indirect application in other related technical fields under the concept of the whole utility model are included in the scope of protection of the utility model.

Claims

1. A welding machine control circuit, applied to a lithium-ion battery argon arc welding machine, wherein the lithium-ion battery argon arc welding machine includes a lithium battery, characterized in that, The welding machine control circuit includes: The main control circuit includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first output terminal and the second output terminal are respectively used to electrically connect the welding clamp and the workpiece to be welded, and the second input terminal is used to electrically connect the lithium battery. A booster voltage regulator circuit includes a third input terminal and a third output terminal, wherein the third output terminal is electrically connected to the first input terminal, and the booster voltage regulator circuit is used to input a boosted voltage to the main control circuit. The main control circuit generates an arc-starting voltage and a boost voltage, which are then superimposed and output to the first output terminal. It also switches the power output of the lithium battery to the first output terminal.

2. The welding machine control circuit according to claim 1, characterized in that, The main control circuit includes: A switching module, wherein the switching module is electrically connected to the first input terminal and the second input terminal respectively, and the switching module includes a first connection terminal; A switch control circuit includes a second connection terminal, a third connection terminal, and a fourth connection terminal. The second connection terminal is electrically connected to the first connection terminal, and the third connection terminal and the fourth connection terminal are electrically connected to the first output terminal and the second output terminal, respectively. An arc-starting unit is electrically connected between the fourth connection terminal and the second output terminal.

3. The welding machine control circuit according to claim 2, characterized in that, The switching module includes: A first unidirectional conductor, one end of which is electrically connected to the first input terminal and the other end of which is electrically connected to the first connection terminal; The second unidirectional conductor has one end electrically connected to the second input terminal and the other end electrically connected to the first connection terminal. An energy storage module, one end of which is electrically connected to the first connection terminal, and the other end is grounded.

4. The welding machine control circuit according to claim 2 or 3, characterized in that, The switch control circuit includes: The power-on module includes a first monitoring terminal and two first conducting terminals. The first monitoring terminal is electrically connected to the third connecting terminal and the fourth connecting terminal. One of the first conducting terminals is electrically connected to the second connecting terminal, and the other first conducting terminal is electrically connected to the third connecting terminal. A freewheeling module is provided, which is electrically connected to the first conducting terminal, the third connecting terminal, and the fourth connecting terminal, respectively.

5. The welding machine control circuit according to claim 1, characterized in that, The booster and voltage regulator circuit includes: The pulse generation module includes a fifth connection terminal; The switch module includes a trigger terminal and two second conducting terminals, wherein the trigger terminal is electrically connected to the fifth connecting terminal; The boost unit includes a control terminal and a fourth output terminal. The control terminal is electrically connected to one of the second conducting terminals, and the other second conducting terminal is grounded. The fourth output terminal is electrically connected to the third output terminal.

6. The welding machine control circuit according to claim 5, characterized in that, It also includes a main control chip, which is electrically connected to the third input terminal and is used to control the pulse generation module to work.

7. The welding machine control circuit according to claim 5, characterized in that, The booster and voltage regulator circuit also includes: A rectifier and filter circuit is electrically connected between the third output terminal and the fourth output terminal. The rectifier and filter circuit is used to rectify and filter the power supply input to the boost unit.

8. The welding machine control circuit according to claim 7, characterized in that, The booster and voltage regulator circuit also includes: The voltage feedback module includes a second monitoring terminal and a feedback terminal. The second monitoring terminal is electrically connected between the rectifier filter circuit and the third output terminal, and the feedback terminal is electrically connected to the third input terminal.

9. The welding machine control circuit according to claim 8, characterized in that, The voltage feedback module includes an optocoupler and multiple Zener diodes. The optocoupler includes two third conducting terminals and two fourth conducting terminals. One of the third conducting terminals is electrically connected to the power supply, and the other of the third conducting terminals is electrically connected to the feedback terminal. One of the fourth conducting terminals is electrically connected to the third output terminal via the multiple Zener diodes, and the other of the fourth conducting terminals is grounded.

10. A lithium-ion battery argon arc welding machine, characterized in that, It includes a lithium battery and a welding machine control circuit as described in any one of claims 1 to 9.

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