High-voltage discharge equipment for welding equipment

Abstract

The present application relates to a high-voltage discharge device for a welding device. It includes a square wave generating circuit, a voltage conversion circuit, a high-voltage discharge circuit, and a switch circuit; the input end of the voltage conversion circuit is used to connect the negative and positive poles of the inverter power supply respectively, and the output end supplies power to the outside; one end of the switch circuit is connected to the output end of the voltage conversion circuit, and the other end is connected to the input end of the square wave generating circuit; the first input end of the high-voltage discharge circuit is connected to the output end of the square wave generating circuit, the second input end is used to connect the positive pole of the inverter power supply, and the output end is used to connect the welding gun. The above-mentioned switch circuit can instruct the high-voltage discharge circuit to output a corresponding voltage according to the voltage output by the inverter power supply of the welding device, without the need for an external control signal to assist in operation (such as a control signal output by a processor). In addition, when the welding device is in the state of long pressing the empty gun, the high-voltage discharge circuit can be automatically controlled to stop running, which increases the durability of the high-voltage discharge equipment.

Description

Technical Field

[0001] The present application relates to the technical field of welding machines, and in particular to a high-voltage discharge device for a welding device. Background Art

[0002] The high-voltage generating equipment is an important component of the argon arc welding machine. It enables the argon arc welding machine to achieve non-contact arc ignition (i.e. high-voltage arc ignition). Compared with the original scraping arc ignition, the non-contact arc ignition has the advantages of high efficiency and high welding quality.

[0003] During the implementation process, the inventors found that there are at least the following problems in the conventional technology: the conventional high voltage generating equipment has the problem of poor adaptability. Summary of the invention

[0004] Based on this, it is necessary to provide a high-voltage discharge device for a welding device with high adaptability in order to solve the above technical problems.

[0005] In order to achieve the above-mentioned object, on the one hand, an embodiment of the present invention provides a high-voltage discharge device of a welding device, comprising:

[0006] Square wave generating circuit;

[0007] Voltage conversion circuit; the input end of the voltage conversion circuit is used to connect the negative electrode and the positive electrode of the inverter power supply respectively, and the output end supplies power to the outside;

[0008] A switch circuit; one end of the switch circuit is connected to the output end of the voltage conversion circuit, and the other end is connected to the input end of the square wave generating circuit;

[0009] High voltage discharge circuit; the first input end of the high voltage discharge circuit is connected to the output end of the square wave generating circuit, the second input end is used to connect to the positive pole of the inverter power supply, and the output end is used to connect to the welding gun.

[0010] In one of the embodiments, it also includes an output duration control circuit;

[0011] One end of the output duration control circuit is connected to the output end of the voltage conversion circuit, and the other end is connected to the output end of the square wave generating circuit.

[0012] In one embodiment, the output duration control circuit includes a capacitor C1, a resistor R1, a Schmitt trigger IC1 and a diode D1;

[0013] One end of the capacitor C1 is grounded, and the other end is connected to one end of the resistor R1; the other end of the resistor R1 is connected to the output end of the voltage conversion circuit; the input end of the Schmitt trigger IC1 is connected between the capacitor C1 and the resistor R1, and the output end is connected to the input end of the square wave generating circuit through the diode D1.

[0014] In one embodiment, the output duration control circuit further includes a diode D2;

[0015] The anode of the diode D2 is connected between the capacitor C1 and the resistor R1 , and the cathode of the diode D2 is connected to the output end of the voltage conversion circuit.

[0016] In one embodiment, the voltage conversion circuit includes a resistor R2, a voltage regulator tube ZD1, a voltage regulator tube ZD2, a capacitor C2, a capacitor C3 and a capacitor C4;

[0017] One end of the capacitor C2 is connected to one end of the resistor R2 and is used to connect to the positive electrode of the inverter power supply, and the other end is connected to the negative electrode of the inverter power supply and is used to connect to the positive electrode of the voltage regulator ZD1; the positive electrode of the voltage regulator ZD1 is respectively connected to one end of the capacitor C3 and one end of the capacitor C4 and is grounded, and the negative electrode is respectively connected to the other end of the capacitor C3, the other end of the capacitor C4, one end of the switch circuit and the positive electrode of the voltage regulator ZD2; the negative electrode of the voltage regulator ZD2 is connected to the other end of the resistor R2.

[0018] In one of the embodiments, it also includes a signal amplification circuit;

[0019] The input end of the signal amplifying circuit is connected to the output end of the square wave generating circuit, and the output end is connected to the first input end of the high voltage discharge circuit.

[0020] In one embodiment, the signal amplification circuit includes a resistor R3, a capacitor C5, a Schmitt trigger IC2, a Schmitt trigger IC3 and a Schmitt trigger IC4;

[0021] The input end of the Schmitt trigger IC2 is respectively connected to one end of the capacitor C5, one end of the resistor R3, the input end of the Schmitt trigger IC3 and the input end of the Schmitt trigger IC4, and the output end is respectively connected to the output end of the Schmitt trigger IC3, the output end of the Schmitt trigger IC4 and the first input end of the high-voltage discharge circuit; the other end of the capacitor C5 is connected to the output end of the square wave generating circuit; the other end of the resistor R3 is used to connect to an external power supply.

[0022] In one embodiment, the switch circuit includes a resistor R4, a capacitor C6, a voltage regulator ZD3, a Schmitt trigger IC5 and a diode D3;

[0023] One end of the resistor R4 is connected to the output end of the voltage conversion circuit, and the other end is respectively connected to the input end of the Schmitt trigger IC5 and the negative electrode of the voltage regulator ZD3 and is grounded through the capacitor C6; the cathode of the diode D3 is respectively connected to the output end of the Schmitt trigger IC5, and the anode is connected to the input end of the square wave generating circuit.

[0024] In one embodiment, the square wave generating circuit includes a resistor R5, a capacitor C7 and a Schmitt trigger IC6;

[0025] One end of capacitor C7 is respectively connected to the output end of the switch circuit, one end of resistor R5 and the input end of Schmitt trigger IC6, and the other end is grounded; the output end of Schmitt trigger IC6 is respectively connected to the other end of resistor R5 and the first input end of the high voltage discharge circuit.

[0026] In one embodiment, the high-voltage discharge circuit includes a resistor R6, a resistor R7, a transformer T1, a MOS tube Q1, a capacitor C8, an arc-starting coil and a discharge column;

[0027] One end of the resistor R6 is connected to the output end of the square wave generating circuit, and the other end is connected to the gate of the MOS tube Q1 and grounded through the resistor R7; the source of the MOS tube Q1 is grounded, and the drain is connected to one end of the primary end of the transformer T1; the other end of the primary end of the transformer T1 is connected to the positive electrode of the inverter power supply, one end of the secondary end of the transformer T1 is respectively connected to one end of the discharge column and one end of the capacitor C8, and the other end of the secondary end of the transformer T1 is respectively connected to the other end of the capacitor C8 and one end of the primary end of the arc starting coil; the other end of the primary end of the arc starting coil is connected to the other end of the discharge column, and the secondary end of the arc starting coil is used to connect the welding gun.

[0028] One of the above technical solutions has the following advantages and beneficial effects:

[0029] The high-voltage discharge device of the welding device provided in the present application includes a square wave generating circuit, a voltage conversion circuit, a high-voltage discharge circuit, and a switch circuit; the input end of the voltage conversion circuit is used to connect the negative and positive poles of the inverter power supply respectively, and the output end supplies power to the outside; one end of the switch circuit is connected to the output end of the voltage conversion circuit, and the other end is connected to the input end of the square wave generating circuit; the first input end of the high-voltage discharge circuit is connected to the output end of the square wave generating circuit, the second input end is used to connect the positive pole of the inverter power supply, and the output end is used to connect the welding gun. The above-mentioned switch circuit can instruct the high-voltage discharge circuit to output the corresponding voltage according to the voltage output by the inverter power supply of the welding device, without the need for an external control signal to assist in operation (such as a control signal output by a processor). In addition, when the welding device is in the state of long-pressing the empty gun, the high-voltage discharge circuit can be automatically controlled to stop running, thereby avoiding damage to components and the like caused by the welding device continuously outputting high voltage for too long, and increasing the durability of the high-voltage discharge equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other purposes, features and advantages of the present application will become clearer through a more specific description of the preferred embodiments of the present application shown in the accompanying drawings. The same reference numerals indicate the same parts in all the accompanying drawings, and the drawings are not deliberately scaled to the actual size, and the focus is on illustrating the subject matter of the present application.

[0031] Figure 1is a first schematic structural block diagram of a high-voltage discharge device of a welding device in one embodiment;

[0032] Figure 2 is a second schematic structural block diagram of a high-voltage discharge device of a welding device in one embodiment;

[0033] Figure 3 is a structural block diagram of an output duration control circuit in one embodiment;

[0034] Figure 4 is a structural block diagram of a voltage conversion circuit in one embodiment;

[0035] Figure 5 is a third schematic structural block diagram of a high-voltage discharge device of a welding device in one embodiment;

[0036] Figure 6 is a structural block diagram of a signal amplification circuit in one embodiment;

[0037] Figure 7 is a structural block diagram of a switch circuit in one embodiment;

[0038] Figure 8 is a structural block diagram of a square wave generating circuit in one embodiment;

[0039] Fig. 9 FIG. 4 is a structural block diagram of a high voltage discharge circuit in one embodiment. DETAILED DESCRIPTION

[0040] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0041] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and combined with it as a whole, or there may be an intermediate element at the same time. The terms "input end", "output end", "one end", "the other end" and similar expressions used in this article are for illustrative purposes only.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0043] In one embodiment, Figure 1 As shown, a high-voltage discharge device of a welding device is provided, comprising:

[0044] Square wave generating circuit 10;

[0045] Voltage conversion circuit 20; the input end of the voltage conversion circuit 20 is used to connect the negative electrode and the positive electrode of the inverter power supply respectively, and the output end supplies power to the outside;

[0046] A switch circuit 30; one end of the switch circuit 30 is connected to the output end of the voltage conversion circuit 20, and the other end is connected to the input end of the square wave generating circuit 10;

[0047] High voltage discharge circuit 40; the first input end of the high voltage discharge circuit 40 is connected to the output end of the square wave generating circuit 10, the second input end is used to connect the positive electrode of the inverter power supply, and the output end is used to connect the welding gun.

[0048] Among them, the square wave generating circuit can be any circuit in the art that generates a square wave signal, and is used in the present application to generate a driving signal for driving a high-voltage discharge circuit. The voltage conversion circuit is used to convert the output voltage of the inverter power supply of the welding device into a power supply circuit, and to supply power to the high-voltage discharge circuit and the switching circuit. The switching circuit is used to control the square wave generating circuit to generate a driving signal and thereby control the high-voltage discharge circuit according to the power supply voltage obtained by converting the output voltage of the inverter power supply. The high-voltage discharge circuit can be any high-voltage discharge circuit in the art, and is used in the welding device to realize non-contact arc ignition (i.e., high-voltage arc ignition).

[0049] Specifically, after the welding device outputs no-load, the output voltage of the inverter power supply will change, so that the power supply voltage converted from the output voltage will change. The switch circuit can output the corresponding high / low voltage level to the square wave generating circuit according to the change of the power supply voltage value. The square wave generating circuit outputs the corresponding drive signal to the high-voltage discharge circuit according to the received high / low voltage level, thereby achieving the effect of controlling the high-voltage arc ignition.

[0050] The above-mentioned high-voltage discharge device only needs to be connected to the output voltage of the inverter power supply of the argon arc welding machine as power supply, and the wiring is simple. Because the output voltage of the welding device generally ranges from 0 volts to 70 volts, and the above-mentioned high-voltage discharge device does not need to be connected to other external power supplies or control signals, it has advantages in power supply isolation and power device compatibility, and solves the problem of circuit damage caused by high-voltage creepage in high-voltage generating equipment from the source. At the same time, the high-voltage discharge device of the present application does not require an external control signal, and the switching circuit can instruct the high-voltage discharge circuit to output a corresponding voltage according to the voltage output by the inverter power supply of the welding device. It only needs to correctly connect the high-voltage discharge device to the ordinary welding device, and the welding device equipped with the above-mentioned high-voltage discharge device can adjust the output state of the high voltage according to the output voltage state of the inverter power supply, reducing complex external wiring, simple installation and low hardware cost.

[0051] In one embodiment, Figure 2 As shown, a high-voltage discharge device of a welding device is provided, comprising:

[0052] Square wave generating circuit 10;

[0053] Voltage conversion circuit 20; the input end of the voltage conversion circuit 20 is used to connect the negative electrode and the positive electrode of the inverter power supply respectively, and the output end supplies power to the outside;

[0054] A switch circuit 30; one end of the switch circuit 30 is connected to the output end of the voltage conversion circuit 20, and the other end is connected to the input end of the square wave generating circuit 10;

[0055] High voltage discharge circuit 40; the first input end of the high voltage discharge circuit 40 is connected to the output end of the square wave generating circuit 10, the second input end is used to connect the positive electrode of the inverter power supply, and the output end is used to connect the welding gun.

[0056] Also includes an output duration control circuit 50;

[0057] One end of the output duration control circuit 50 is connected to the output end of the voltage conversion circuit 10 , and the other end is connected to the output end of the square wave generation circuit 10 .

[0058] The output time control circuit is used to automatically stop the operation of the high-voltage discharge circuit after the normal arcing state of the welding device is maintained for a fixed time. In a specific example, the fixed time is 1 second.

[0059] In a specific example, the output market control circuit can obtain the welding gun output voltage through the sampling circuit and transmit the welding gun output voltage signal to the controller. After the fixed time, the controller outputs a control signal to the high-voltage discharge circuit, so that the high-voltage discharge circuit disconnects the power supply voltage connected to the voltage conversion circuit.

[0060] In another embodiment, Figure 3 As shown, the output duration control circuit includes a capacitor C1, a resistor R1, a Schmitt trigger IC1 and a diode D1; one end of the capacitor C1 is grounded, and the other end is connected to one end of the resistor R1; the other end of the resistor R1 is connected to the output end of the voltage conversion circuit; the input end of the Schmitt trigger IC1 is connected between the capacitor C1 and the resistor R1, and the output end is connected to the input end of the square wave generating circuit through the diode D1.

[0061] Specifically, after pressing the welding gun, the welding device outputs a no-load voltage, and the supply voltage VCC of the Schmitt trigger IC1 changes from 0V to +15V. The +15V supply voltage charges the capacitor C1 through the resistor R1. When the voltage of the capacitor C1 exceeds 8.8V, the output of the Schmitt trigger IC1 will become a low level, and the output state of the square wave generating circuit is limited by the diode D1, so that the output is always high, achieving the effect of stopping the output of the high-voltage discharge circuit. In this process, the time for the voltage on the capacitor C1 to charge from 0V to 8.8V is the maximum time that the high-voltage discharge circuit can continue to discharge.

[0062] In one embodiment, the output duration control circuit includes a capacitor C1, a resistor R1, a Schmitt trigger IC1 and a diode D1; one end of the capacitor C1 is grounded, and the other end is connected to one end of the resistor R1; the other end of the resistor R1 is connected to the output end of the voltage conversion circuit; the input end of the Schmitt trigger IC1 is connected between the capacitor C1 and the resistor R1, and the output end is connected to the input end of the square wave generating circuit through the diode D1.

[0063] The output duration control circuit further includes a diode D2; an anode of the diode D2 is connected between the capacitor C1 and the resistor R1, and a cathode of the diode D2 is connected to the output end of the voltage conversion circuit.

[0064] Specifically, the role of the diode D2 in the circuit is to provide a fast discharge channel for the capacitor C1, thereby increasing the corresponding efficiency of continuous arc starting.

[0065] In one embodiment, if Figure 4 As shown, the voltage conversion circuit includes a resistor R2, a voltage regulator tube ZD1, a voltage regulator tube ZD2, a capacitor C2, a capacitor C3 and a capacitor C4;

[0066] One end of the capacitor C2 is connected to one end of the resistor R2 and is used to connect to the positive electrode of the inverter power supply, and the other end is connected to the negative electrode of the inverter power supply and is used to connect to the positive electrode of the voltage regulator ZD1; the positive electrode of the voltage regulator ZD1 is respectively connected to one end of the capacitor C3 and one end of the capacitor C4 and is grounded, and the negative electrode is respectively connected to the other end of the capacitor C3, the other end of the capacitor C4, one end of the switch circuit and the positive electrode of the voltage regulator ZD2; the negative electrode of the voltage regulator ZD2 is connected to the other end of the resistor R2.

[0067] Specifically, the voltage conversion circuit is used to convert the output voltage of the inverter power supply into a power supply voltage VCC and supply power to the outside.

[0068] Among them, R2 is a power resistor, C2 is a filter capacitor, ZD2 can be a 24V voltage regulator, ZD1 can be a 15V voltage regulator, C3 is an electrolytic capacitor, and C4 is a filter capacitor.

[0069] It should be noted that one end of the resistor R8 is connected to the positive electrode of the inverter power supply (ie, the ground clamp), and the capacitor C2, the voltage regulator tube ZD1, the capacitor C3 and the capacitor C4 are connected to the negative electrode of the output voltage of the welding machine (ie, the argon arc welding gun).

[0070] The voltage regulator ZD1 (15V voltage regulator) ensures that the power supply voltage output by the voltage conversion circuit does not exceed 15V, ensuring the safety of the upper voltage limit; the placement of the voltage regulator ZD2 (24V voltage regulator) makes the output voltage of the inverter power supply greater than 27V to work normally.

[0071] R2 is a power limiting resistor to ensure that ZD1 and ZD2 operate at a safe power level; capacitors C2, C3 and C4 act as filters to reduce power supply interference.

[0072] In one embodiment, Figure 5 As shown, a high-voltage discharge device of a welding device is provided, comprising:

[0073] Square wave generating circuit 10;

[0074] Voltage conversion circuit 20; the input end of the voltage conversion circuit 20 is used to connect the negative electrode and the positive electrode of the inverter power supply respectively, and the output end supplies power to the outside;

[0075] A switch circuit 30; one end of the switch circuit 30 is connected to the output end of the voltage conversion circuit 20, and the other end is connected to the input end of the square wave generating circuit 10;

[0076] High voltage discharge circuit 40; the first input end of the high voltage discharge circuit 40 is connected to the output end of the square wave generating circuit 10, the second input end is used to connect the positive electrode of the inverter power supply, and the output end is used to connect the welding gun.

[0077] Also includes an output duration control circuit 50;

[0078] One end of the output duration control circuit 50 is connected to the output end of the voltage conversion circuit 10 , and the other end is connected to the output end of the square wave generation circuit 10 .

[0079] Also includes a signal amplification circuit 60;

[0080] The input end of the signal amplifying circuit 60 is connected to the output end of the square wave generating circuit 10 , and the output end of the signal amplifying circuit 60 is connected to the first input end of the high voltage discharge circuit 40 .

[0081] Specifically, the signal amplification circuit can be any signal amplification circuit in the art, which is used to amplify the power of the square wave signal output by the square wave generating circuit, thereby driving the high-voltage discharge circuit. In one embodiment, Figure 6 As shown, the signal amplifying circuit includes a resistor R3, a capacitor C5, a Schmitt trigger IC2, a Schmitt trigger IC3 and a Schmitt trigger IC4;

[0082] The input end of the Schmitt trigger IC2 is respectively connected to one end of the capacitor C5, one end of the resistor R3, the input end of the Schmitt trigger IC3 and the input end of the Schmitt trigger IC4, and the output end is respectively connected to the output end of the Schmitt trigger IC3, the output end of the Schmitt trigger IC4 and the first input end of the high-voltage discharge circuit; the other end of the capacitor C5 is connected to the output end of the square wave generating circuit; the other end of the resistor R3 is used to connect to an external power supply.

[0083] It should be noted that the resistor R3 is a pull-up resistor used to determine the potential. The capacitor C5 is a pulse drive capacitor.

[0084] In one embodiment, if Figure 7 As shown, the switch circuit includes a resistor R4, a capacitor C6, a voltage regulator tube ZD3, a Schmitt trigger IC5 and a diode D3;

[0085] One end of the resistor R4 is connected to the output end of the voltage conversion circuit, and the other end is respectively connected to the input end of the Schmitt trigger IC5 and the negative electrode of the voltage regulator ZD3 and is grounded through the capacitor C6; the cathode of the diode D3 is respectively connected to the output end of the Schmitt trigger IC5, and the anode is connected to the input end of the square wave generating circuit.

[0086] The switch circuit is used to stop the high-voltage discharge output immediately after the welding machine starts arcing normally. The resistor R4 is a power resistor, the voltage regulator ZD3 can be a 3.9V voltage regulator, and the capacitor C6 is a filter capacitor.

[0087] Specifically, after the welding device outputs no-load, the power supply voltage VCC output by the voltage conversion circuit will change from 0V to +15V, and the voltage stabilizing circuit composed of resistor R4, voltage regulator ZD3, and capacitor C26 will stabilize the voltage of the input pin of the Schmitt trigger IC5 at 3.9V. According to the characteristics of the Schmitt trigger, when VCC is greater than 7V, the output pin of the Schmitt trigger IC5 outputs a high level, and the high-voltage discharge circuit operates normally; when VCC is less than 7V, the output pin of the Schmitt trigger IC5 outputs a low level, and the high-voltage output circuit stops operating.

[0088] Therefore, the above switch circuit can realize the following functions:

[0089] 1. During the rising edge of the power supply voltage VCC (from 0V to 15V), when VCC is greater than 10V, the high-voltage discharge circuit starts to work and outputs high voltage.

[0090] 2. During the falling edge phase of the power supply voltage VCC (from 15V to 0V), when VCC is less than 7V, the high-voltage discharge circuit stops working and no longer outputs high voltage.

[0091] According to the working characteristics of the voltage conversion circuit and the welding device, when the output voltage of the inverter power supply is greater than 34V, the high-voltage discharge circuit outputs high voltage; when the output voltage is less than 31V, the high-voltage discharge circuit stops outputting high voltage.

[0092] In a specific example, the no-load voltage of a welding device is generally between 50V and 70V. In the working state, the working voltage of the welding device is proportional to the working current, and the formula is Uo (volts) = 10 + 0.4I (amperes). In other words, the voltage of a welding device below 500 is less than 30V when working. This circuit determines that as long as the working voltage is less than 31V, the high-voltage circuit can stop outputting.

[0093] Through the above-mentioned switching circuit, the welding device can achieve the technical effect of high-voltage arc ignition when no-load and no high-voltage output when loaded.

[0094] It should be noted that according to the data sheet, the rising edge transition voltage point VP is 2.9V when the power supply is 5V, 5.9V when the power supply is 10V, and 8.8V when the power supply is 15V. The falling edge transition voltage point VN is 1.9V when the power supply is 5V, 3.9V when the power supply is 10V, and 5.8V when the power supply is 15V. The voltage values ​​mentioned above are all typical values.

[0095] In one embodiment, if Figure 8 As shown, the square wave generating circuit includes a resistor R5, a capacitor C7 and a Schmitt trigger IC6;

[0096] One end of capacitor C7 is respectively connected to the output end of the switch circuit, one end of resistor R5 and the input end of Schmitt trigger IC6, and the other end is grounded; the output end of Schmitt trigger IC6 is respectively connected to the other end of resistor R5 and the first input end of the high voltage discharge circuit.

[0097] Specifically, the function of the above-mentioned square wave generating circuit is to generate a square wave with a duty cycle of 50% as a driving signal of the high voltage generating circuit, and the frequency of the output square wave is f=1 / (k*RC).

[0098] In one embodiment, if Fig. 9 As shown, the high-voltage discharge circuit includes a resistor R6, a resistor R7, a transformer T1, a MOS tube Q1, a capacitor C8, an arc-starting coil T10 and a discharge column FD1;

[0099] One end of the resistor R6 is connected to the output end of the square wave generating circuit, and the other end is connected to the gate of the MOS tube Q1 and grounded through the resistor R7; the source of the MOS tube Q1 is grounded, and the drain is connected to one end of the primary end of the transformer T1; the other end of the primary end of the transformer T1 is connected to the positive electrode of the inverter power supply, one end of the secondary end of the transformer T1 is respectively connected to one end of the discharge column and one end of the capacitor C8, and the other end of the secondary end of the transformer T1 is respectively connected to the other end of the capacitor C8 and one end of the primary end of the arc starting coil; the other end of the primary end of the arc starting coil is connected to the other end of the discharge column, and the secondary end of the arc starting coil is used to connect the welding gun.

[0100] Among them, resistors R6 and R7 are used as driving resistors of MOS tube Q1. T1 is a voltage amplifying transformer, also known as a high-voltage package, and C8 is a high-voltage capacitor.

[0101] The control signal is a square wave signal, which is input from the gate of MOS tube Q1.

[0102] The secondary end of TI is the boosted pulse voltage, which passes through the discharge column, discharge capacitor C8 and arc starting coil to produce a pulse discharge phenomenon, which is used to ignite the arc (also known as non-contact arc starting for argon arc welding).

[0103] The arc starting coil is generally an unsaturated transformer. The primary end of the arc starting coil is connected to the high-voltage discharge circuit, forming a part of the discharge circuit, and the secondary end is connected in series to the output circuit of the welding device. The high-voltage energy coupled from the primary end is used to ignite the arc, allowing the welding device to achieve the function of non-contact arc starting.

[0104] In a specific example, a resistor R18 is further included, wherein the resistor R18 is a power limiting resistor, one end of which is used to connect to one end of the primary end of T1, and the other end of which is used to connect to the positive electrode of the inverter power supply.

[0105] In one embodiment, a high voltage discharge device of a welding device is provided, comprising:

[0106] Square wave generating circuit; the square wave generating circuit comprises a resistor R5, a capacitor C7 and a Schmitt trigger IC6;

[0107] One end of capacitor C7 is respectively connected to the output end of the switch circuit, one end of resistor R5 and the input end of Schmitt trigger IC6, and the other end is grounded; the output end of Schmitt trigger IC6 is respectively connected to the other end of resistor R5 and the first input end of the high voltage discharge circuit.

[0108] A voltage conversion circuit; the input end of the voltage conversion circuit is respectively used to connect the negative electrode and the positive electrode of the inverter power supply, and the output end supplies power to the outside; the voltage conversion circuit includes a resistor R2, a voltage regulator ZD1, a voltage regulator ZD2, a capacitor C2, a capacitor C3 and a capacitor C4; one end of the capacitor C2 is connected to one end of the resistor R2 and is used to connect the positive electrode of the inverter power supply, and the other end is connected to the negative electrode of the inverter power supply and is used to connect the positive electrode of the voltage regulator ZD1; the positive electrode of the voltage regulator ZD1 is respectively connected to one end of the capacitor C3 and one end of the capacitor C4 and is grounded, and the negative electrode is respectively connected to the other end of the capacitor C3, the other end of the capacitor C4, one end of the switch circuit and the positive electrode of the voltage regulator ZD2; the negative electrode of the voltage regulator ZD2 is connected to the other end of the resistor R2.

[0109] A switch circuit; one end of the switch circuit is connected to the output end of the voltage conversion circuit, and the other end is connected to the input end of the square wave generating circuit; the switch circuit comprises a resistor R4, a capacitor C6, a voltage regulator ZD3, a Schmitt trigger IC5 and a diode D3; one end of the resistor R4 is connected to the output end of the voltage conversion circuit, and the other end is respectively connected to the input end of the Schmitt trigger IC5 and the negative electrode of the voltage regulator ZD3 and is grounded through the capacitor C6; the cathode of the diode D3 is respectively connected to the output end of the Schmitt trigger IC5, and the anode is connected to the input end of the square wave generating circuit.

[0110] High-voltage discharge circuit; the first input end of the high-voltage discharge circuit is connected to the output end of the square wave generating circuit, the second input end is used to connect the positive electrode of the inverter power supply, and the output end is used to connect the welding gun. The high-voltage discharge circuit includes resistor R6, resistor R7, transformer T1, MOS tube Q1, capacitor C8, arc initiation coil and discharge column;

[0111] One end of the resistor R6 is connected to the output end of the square wave generating circuit, and the other end is connected to the gate of the MOS tube Q1 and grounded through the resistor R7; the source of the MOS tube Q1 is grounded, and the drain is connected to one end of the primary end of the transformer T1; the other end of the primary end of the transformer T1 is connected to the positive electrode of the inverter power supply, one end of the secondary end of the transformer T1 is respectively connected to one end of the discharge column and one end of the capacitor C8, and the other end of the secondary end of the transformer T1 is respectively connected to the other end of the capacitor C8 and one end of the primary end of the arc starting coil; the other end of the primary end of the arc starting coil is connected to the other end of the discharge column, and the secondary end of the arc starting coil is used to connect the welding gun.

[0112] It also includes an output time control circuit; one end of the output time control circuit is connected to the output end of the voltage conversion circuit, and the other end is connected to the output end of the square wave generating circuit. The output time control circuit includes a capacitor C1, a resistor R1, a Schmitt trigger IC1 and a diode D1; one end of the capacitor C1 is grounded, and the other end is connected to one end of the resistor R1; the other end of the resistor R1 is connected to the output end of the voltage conversion circuit; the input end of the Schmitt trigger IC1 is connected between the capacitor C1 and the resistor R1, and the output end is connected to the input end of the square wave generating circuit through the diode D1. In one embodiment, the output time control circuit also includes a diode D2; the anode of the diode D2 is connected between the capacitor C1 and the resistor R1, and the cathode is connected to the output end of the voltage conversion circuit.

[0113] It also includes a signal amplifying circuit; the signal amplifying circuit includes a resistor R3, a capacitor C5, a Schmitt trigger IC2, a Schmitt trigger IC3 and a Schmitt trigger IC4;

[0114] The input end of the Schmitt trigger IC2 is respectively connected to one end of the capacitor C5, one end of the resistor R3, the input end of the Schmitt trigger IC3 and the input end of the Schmitt trigger IC4, and the output end is respectively connected to the output end of the Schmitt trigger IC3, the output end of the Schmitt trigger IC4 and the first input end of the high-voltage discharge circuit; the other end of the capacitor C5 is connected to the output end of the square wave generating circuit; the other end of the resistor R3 is used to connect to an external power supply.

[0115] Specifically, the anodes of diodes D1 and D5 are connected between capacitor C7 and the input terminal of IC2.

[0116] It should be noted that the above-mentioned Schmitt triggers IC1, IC2, IC3, IC4, IC5 and IC6 can be replaced by the chip CD40106. Specifically, the functions of the above-mentioned triggers can be realized by providing this chip. According to the CD40106 data sheet, the rising edge conversion voltage point VP is 2.9V when the power supply is 5V, 5.9V when the power supply is 10V, and 8.8V when the power supply is 15V. The falling edge conversion voltage point VN is 1.9V when the power supply is 5V, 3.9V when the power supply is 10V, and 5.8V when the power supply is 15V. The power supply voltage range of CD40106 is between 3V and 18V.

[0117] In one embodiment, a welding device is provided, comprising the high voltage discharge device as described above.

[0118] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0119] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A high voltage discharge device for a welding device, characterized in that: include: Square wave generating circuit; Voltage conversion circuit; the input end of the voltage conversion circuit is used to connect the negative electrode and the positive electrode of the inverter power supply respectively, and the output end supplies power to the outside; Switching circuit; One end of the switch circuit is connected to the output end of the voltage conversion circuit, and the other end is connected to the input end of the square wave generating circuit; A high-voltage discharge circuit; a first input end of the high-voltage discharge circuit is connected to the output end of the square wave generating circuit, a second input end is used to connect to the positive electrode of the inverter power supply, and an output end is used to connect to a welding gun; Wherein, the switch circuit is used to control the square wave generating circuit to generate a driving signal according to the power supply voltage obtained by converting the output voltage of the inverter power supply, so as to control the high-voltage discharge circuit; Wherein, the switch circuit can output corresponding high / low voltage levels to the square wave generating circuit according to the change of the supply voltage value; the square wave generating circuit outputs corresponding driving signals to the high-voltage discharge circuit according to the received high / low voltage levels, thereby achieving the effect of controlling high-voltage arc ignition; An output duration control circuit; one end of the output duration control circuit is connected to the output end of the voltage conversion circuit, and the other end is connected to the output end of the square wave generating circuit; A signal amplifying circuit; the input end of the signal amplifying circuit is connected to the output end of the square wave generating circuit, and the output end is connected to the first input end of the high voltage discharge circuit.

2. The high voltage discharge device of the welding device according to claim 1, characterized in that: The output duration control circuit includes a capacitor C1, a resistor R1, a Schmitt trigger IC1 and a diode D1; One end of the capacitor C1 is grounded, and the other end is connected to one end of the resistor R1; the other end of the resistor R1 is connected to the output end of the voltage conversion circuit; the input end of the Schmitt trigger IC1 is connected between the capacitor C1 and the resistor R1, and the output end is connected to the input end of the square wave generating circuit through the diode D1.

3. The high voltage discharge device of the welding device according to claim 2, characterized in that: The output duration control circuit also includes a diode D2; The anode of the diode D2 is connected between the capacitor C1 and the resistor R1 , and the cathode is connected to the output end of the voltage conversion circuit.

4. The high voltage discharge device of the welding device according to claim 1, characterized in that: The voltage conversion circuit includes a resistor R2, a voltage regulator tube ZD1, a voltage regulator tube ZD2, a capacitor C2, a capacitor C3 and a capacitor C4; One end of the capacitor C2 is connected to one end of the resistor R2 and is used to connect to the positive electrode of the inverter power supply, and the other end is connected to the negative electrode of the inverter power supply and is used to connect to the positive electrode of the voltage regulator ZD1; the positive electrode of the voltage regulator ZD1 is respectively connected to one end of the capacitor C3 and one end of the capacitor C4 and is grounded, and the negative electrode is respectively connected to the other end of the capacitor C3, the other end of the capacitor C4, one end of the switch circuit and the positive electrode of the voltage regulator ZD2; the negative electrode of the voltage regulator ZD2 is connected to the other end of the resistor R2.

5. The high voltage discharge device of the welding device according to claim 1, characterized in that: The signal amplifying circuit includes a resistor R3, a capacitor C5, a Schmitt trigger IC2, a Schmitt trigger IC3 and a Schmitt trigger IC4; The input end of the Schmitt trigger IC2 is respectively connected to one end of the capacitor C5, one end of the resistor R3, the input end of the Schmitt trigger IC3 and the input end of the Schmitt trigger IC4, and the output end is respectively connected to the output end of the Schmitt trigger IC3, the output end of the Schmitt trigger IC4 and the first input end of the high-voltage discharge circuit; the other end of the capacitor C5 is connected to the output end of the square wave generating circuit; the other end of the resistor R3 is used to connect to an external power supply.

6. The high voltage discharge device of the welding device according to claim 1, characterized in that: The switch circuit includes a resistor R4, a capacitor C6, a voltage regulator tube ZD3, a Schmitt trigger IC5 and a diode D3; One end of the resistor R4 is connected to the output end of the voltage conversion circuit, and the other end is respectively connected to the input end of the Schmitt trigger IC5 and the negative electrode of the voltage regulator ZD3 and is grounded through the capacitor C6; the cathode of the diode D3 is respectively connected to the output end of the Schmitt trigger IC5, and the anode is connected to the input end of the square wave generating circuit.

7. The high voltage discharge device of the welding device according to claim 1, characterized in that: The square wave generating circuit comprises a resistor R5, a capacitor C7 and a Schmitt trigger IC6; One end of the capacitor C7 is respectively connected to the output end of the switch circuit, one end of the resistor R5 and the input end of the Schmitt trigger IC6, and the other end is grounded; the output end of the Schmitt trigger IC6 is respectively connected to the other end of the resistor R5 and the first input end of the high-voltage discharge circuit.

8. The high voltage discharge device of the welding device according to claim 1, characterized in that: The high-voltage discharge circuit includes a resistor R6, a resistor R7, a transformer T1, a MOS tube Q1, a capacitor C8, an arc-starting coil and a discharge column; One end of the resistor R6 is connected to the output end of the square wave generating circuit, and the other end is connected to the gate of the MOS tube Q1 and grounded through the resistor R7; the source of the MOS tube Q1 is grounded, and the drain is connected to one end of the primary end of the transformer T1; the other end of the primary end of the transformer T1 is connected to the positive electrode of the inverter power supply, one end of the secondary end of the transformer T1 is respectively connected to one end of the discharge column and one end of the capacitor C8, and the other end of the secondary end of the transformer T1 is respectively connected to the other end of the capacitor C8 and one end of the primary end of the arc starting coil; the other end of the primary end of the arc starting coil is connected to the other end of the discharge column, and the secondary end of the arc starting coil is used to connect the welding gun.

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