Welding machine and its output power limiting method, device and storage medium

Abstract

The present invention discloses a welding machine and its output power limiting method, device and storage medium. The welding machine output power limiting method comprises: obtaining the current actual power and the current limited power of the welding machine; judging whether the current actual power is within a preset power range; if not, determining the setting signal of the welding machine at the current moment according to the current limited power; the setting signal comprises a setting voltage or a setting current; and determining the target output power of the welding machine according to the setting signal at the current moment. The present invention adjusts the setting voltage or setting current of the welding machine at the current moment so that the target output power of the welding machine is near the limited power, thereby improving the stability of the welding process of the welding machine. At the same time, it can prevent the actual power of the welding machine from being too large and damaging the welding machine components, thereby improving the service life of the welding machine.

Description

Technical Field

[0001] The present invention relates to the technical field of welding machine control, and in particular to a welding machine and an output power limiting method, device and storage medium thereof. Background Art

[0002] During the welding process, when the output power of the welding machine is constant, the lower the input voltage, the greater the input current will be. When the input current exceeds the allowable value of the power device in the welding machine, it is easy to damage the power device or reduce the service life of the power device.

[0003] In the prior art, the maximum current or the maximum voltage is generally limited by a hardware circuit to prevent the input current of the welding machine from exceeding the allowable value of the power device in the welding machine. However, the hardware circuit is often more complicated, which increases the cost of the welding machine. At the same time, this method can only limit one parameter of the maximum current or the maximum voltage, and the limited maximum current or the maximum voltage can only be a fixed value. Therefore, the target output power of the welding machine is unstable, which affects the stability of the welding process of the welding machine. Summary of the invention

[0004] The present invention provides a welding machine and an output power limiting method, device and storage medium thereof to solve the defects in the prior art. By adjusting the set voltage or set current of the welding machine at the current moment, the target output power of the welding machine is made near the limit power, thereby improving the stability of the welding process of the welding machine and increasing the service life of the welding machine.

[0005] In a first aspect, the present invention provides a method for limiting output power of a welding machine, comprising:

[0006] Get the current actual power and current limited power of the welding machine;

[0007] Determining whether the current actual power is within a preset power range;

[0008] If not, determining the setting signal of the welding machine at the current moment according to the current limited power; the setting signal includes a setting voltage or a setting current;

[0009] The target output power of the welding machine is determined according to the setting signal at the current moment.

[0010] Optionally, obtain the current actual power of the welding machine, including:

[0011] Obtaining instantaneous feedback current and instantaneous feedback voltage of the welding machine;

[0012] The current actual power of the welding machine is determined according to the product of the instantaneous feedback current and the instantaneous feedback voltage.

[0013] Optionally, when the setting signal includes the setting voltage, determining the setting signal of the welding machine at the current moment according to the current limit power includes:

[0014] Determining a power change according to a difference between the current actual power and the current limited power;

[0015] Determining a voltage change according to the power change and the instantaneous feedback current;

[0016] The set voltage at the current moment is determined according to the set voltage at the previous moment and the voltage change.

[0017] Optionally, determining the set voltage at the current moment according to the set voltage at the previous moment and the voltage change includes:

[0018] When the current actual power is greater than the current limited power, the set voltage at the current moment is:

[0019] MaxSetVolt [1] =MaxSetVolt [2] -△Volt; or,

[0020] MaxSetVolt [1] =MaxSetVolt [2] -△Volt / K1;

[0021] When the current actual power is less than the current limited power, the set voltage at the current moment is:

[0022] MaxSetVolt [1] =MaxSetVolt [2] +△Volt; or,

[0023] MaxSetVolt [1] =MaxSetVolt [2] +△Volt / K2;

[0024] Among them, MaxSetVolt [1] is the set voltage at the current moment, MaxSetVolt [2] is the set voltage at the previous moment, ΔVolt is the voltage change, K1 and K2 are voltage adjustment coefficients, K1>1, K2>1.

[0025] Optionally, when the setting signal includes the setting current, determining the setting signal of the welding machine at the current moment according to the current limiting power includes:

[0026] Determining a power change according to a difference between the current actual power and the current limited power;

[0027] Determining a current change amount according to the power change amount and the instantaneous feedback voltage;

[0028] The set current at the current moment is determined according to the set current at the previous moment and the current change.

[0029] Optionally, determining the set current at the current moment according to the set current at the previous moment and the current change includes:

[0030] When the current actual power is greater than the current limited power, the set current at the current moment is:

[0031] MaxSetCurr [1] =MaxSetCurr [2] -△Curr; or

[0032] MaxSetCurr [1] =MaxSetCurr [2] -△Curr / K3;

[0033] When the current actual power is less than the current limited power, the set current at the current moment is:

[0034] MaxSetCurr [1] =MaxSetCurr [2] +△Curr; or,

[0035] MaxSetCurr [1] =MaxSetCurr [2] +△Curr / K4;

[0036] Among them, MaxSetCurr [1] is the set current at the current moment, MaxSetCurr [2] is the set current at the previous moment, △Curr is the current change, K3 and K4 are current adjustment coefficients, K3>1, K4>1.

[0037] Optionally, when the setting signal includes a setting voltage, obtaining the current actual power of the welding machine includes:

[0038] Acquiring the set voltage at the previous moment and the instantaneous feedback current of the welding machine;

[0039] The current actual power of the welding machine is determined according to the product of the instantaneous feedback current and the set voltage at the previous moment.

[0040] Optionally, determining a setting signal of the welding machine at a current moment according to the current limited power includes:

[0041] The quotient of the current limited power and the instantaneous feedback current is determined as the set voltage at the current moment.

[0042] Optionally, when the setting signal includes a setting current, obtaining the current actual power of the welding machine includes:

[0043] Acquiring the set current at the previous moment and the instantaneous feedback voltage of the welding machine;

[0044] The current actual power of the welding machine is determined according to the product of the instantaneous feedback voltage and the set current at the previous moment.

[0045] Optionally, determining a setting signal of the welding machine at a current moment according to the current limited power includes:

[0046] The quotient of the current limited power and the instantaneous feedback voltage is determined as the set current at the current moment.

[0047] Optionally, the welding machine output power limiting method further includes:

[0048] If the current actual power is within the preset power range, the setting signal at the previous moment is determined as the setting signal at the current moment.

[0049] In a second aspect, the present invention further provides a welding machine output power limiting device, comprising:

[0050] A power acquisition module is used to obtain the current actual power and current limited power of the welding machine;

[0051] A judging module, used to judge whether the current actual power is within a preset power range;

[0052] A setting signal determination module, used to determine the setting signal of the welding machine at the current moment according to the current limited power; the setting signal includes a setting voltage or a setting current;

[0053] The target output power determination module is used to determine the target output power of the welding machine according to the setting signal at the current moment.

[0054] In a third aspect, the present invention further provides a welding machine, comprising at least a controller;

[0055] The controller is used to execute any one of the above-mentioned methods for limiting the output power of a welding machine.

[0056] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to implement any of the above-mentioned welding machine output power limiting methods when executed by a processor.

[0057] The technical solution of the present invention determines the setting signal of the welding machine at the current moment according to the current limiting power when the actual power is not within the preset power range, thereby determining the target output power of the welding machine according to the setting signal at the current moment, so that the target output power of the welding machine is near the limiting power, thereby improving the stability of the welding process of the welding machine, and at the same time, preventing the actual power of the welding machine from being too large to damage the welding machine components, thereby increasing the service life of the welding machine.

[0058] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0060] Figure 1 A flowchart of a welding machine output power limiting method provided in Embodiment 1 of the present invention;

[0061] Figure 2 A flowchart of a welding machine output power limiting method provided in Embodiment 2 of the present invention;

[0062] Figure 3 A flowchart of a method for limiting output power of a welding machine provided in Embodiment 3 of the present invention;

[0063] Figure 4 A flowchart of a welding machine output power limiting method provided in Embodiment 4 of the present invention;

[0064] Figure 5 A flowchart of a method for limiting output power of a welding machine provided in Embodiment 5 of the present invention;

[0065] Figure 6 A schematic diagram of the structure of a welding machine output power limiting device provided in Embodiment 6 of the present invention;

[0066] Figure 7 A structural block diagram of a welding machine is provided for Embodiment 7 of the present invention. DETAILED DESCRIPTION

[0067] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0068] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0069] Embodiment 1

[0070] An embodiment of the present invention provides a method for limiting the output power of a welding machine, which can be used to control the output power of a welding machine. The limiting method can be executed by a limiting device provided by an embodiment of the present invention. The limiting device is implemented in the form of hardware and / or software, and the limiting device can be integrated into a controller of the welding machine. Figure 1 This is a flowchart of a welding machine output power limiting method provided in Embodiment 1 of the present invention, referring to Figure 1 As shown, the welding machine output power limiting method includes:

[0071] S110, obtaining the current actual power and the current limited power of the welding machine.

[0072] The current actual power of the welding machine may be the power actually output by the current welding machine, which may be determined by the current current and voltage of the welding machine. The current limited power may be the maximum output power allowed by the current welding machine.

[0073] S120, determine whether the current actual power is within a preset power range; if so, execute S130; if not, execute S140.

[0074] Among them, the preset power range can be a preset output power allowed by the welding machine. In an exemplary embodiment, the preset power range can be the current power limit of the welding machine; in another exemplary embodiment, the preset power range can also be less than or equal to the current power limit of the welding machine.

[0075] S130: Determine the setting signal at the previous moment as the setting signal at the current moment.

[0076] The setting signal at the previous moment may be a setting signal determined according to the last power limitation.

[0077] Specifically, when the welding machine is working, if the current actual power of the welding machine obtained in real time is within the preset power range, the setting signal at the previous moment is determined as the setting signal at the current moment, that is, the setting signal at the current moment is maintained as the setting signal at the previous moment, so as to improve the welding stability of the welding machine.

[0078] S140: Determine the setting signal of the welding machine at the current moment according to the current limited power.

[0079] The setting signal includes a setting voltage or a setting current; the setting voltage may be a maximum voltage allowed to be output by the welding machine, and the setting current may be a maximum current allowed to be output by the welding machine.

[0080] Specifically, when the welder is working, the current actual power and the current limited power of the welder are obtained in real time. When the current actual power is not within the preset power range, the set current or set voltage of the welder at the current moment is determined according to the current limited power of the welder. For example, when the welder is in manual welding or argon arc welding mode, if the current actual power of the welder is not within the preset power range, the set current of the welder at the current moment is determined according to the current limited power of the welder; when the welder is in gas shielded welding mode, if the current actual power of the welder is not within the preset power range, the set voltage of the welder at the current moment is determined according to the current limited power of the welder.

[0081] S150: Determine the target output power of the welding machine according to the setting signal at the current moment.

[0082] Among them, the target output power of the welding machine can be the adjusted output power determined according to the set voltage and actual current of the welding machine at the current moment when the current actual output power of the welding machine is greater than the current limited power of the welding machine, or the adjusted output power determined according to the set current and actual voltage of the welding machine at the current moment.

[0083] In an exemplary embodiment, when the welder is in manual welding or argon arc welding mode, if the current actual power of the welder is not within the preset power range, after determining the current set current of the welder according to the current power limit of the welder, the target output power of the welder is determined according to the product of the current set current and the current actual voltage; when the welder is in gas shielded welding mode, if the current actual power of the welder is not within the preset power range, the current set voltage of the welder is determined according to the current power limit of the welder, and then the target output power of the welder is determined according to the product of the current set voltage and the current actual current.

[0084] In this embodiment, when the actual power is not within the preset power range, the setting signal of the welding machine at the current moment is determined according to the current limit power, so that the target output power of the welding machine is determined according to the setting signal at the current moment, so that the target output power of the welding machine is near the limit power, thereby improving the stability of the welding process of the welding machine. At the same time, it can prevent the actual power of the welding machine from being too large to damage the welding machine components, thereby increasing the service life of the welding machine.

[0085] Embodiment 2

[0086] Figure 2 This is a flow chart of a method for limiting the output power of a welding machine provided in the second embodiment of the present invention. Based on the above embodiment, when the setting signal includes a setting voltage, the embodiment of the present invention further adds steps of how to obtain the current actual power of the welding machine and how to determine the setting signal of the welding machine at the current moment according to the current limit power. This embodiment is applicable to the power limitation of the welding machine when it is working in the gas shielded welding mode. Figure 2 As shown, the welding machine output power limiting method specifically includes:

[0087] S210, obtaining the instantaneous feedback current and instantaneous feedback voltage of the welding machine.

[0088] The instantaneous feedback current may be the actual current of the welding machine at the current moment; the instantaneous feedback voltage may be the actual voltage of the welding machine at the current moment. In an optional embodiment, the instantaneous feedback current of the welding machine may be the current after filtering the actual current of the welding machine at the current moment, and the instantaneous feedback voltage of the welding machine may be the voltage after filtering the actual voltage of the welding machine at the current moment.

[0089] S220. Determine the current actual power of the welding machine according to the product of the instantaneous feedback current and the instantaneous feedback voltage.

[0090] In an exemplary embodiment, the instantaneous feedback current of the welding machine is recorded as FdbCurr, and the instantaneous feedback voltage of the welding machine is recorded as FdbVolt, then the current actual power of the welding machine Power=FdbVolt*FdbCurr.

[0091] S230: Obtain the current power limit of the welding machine.

[0092] S240, determining whether the current actual power is within a preset power range; if not, executing S250.

[0093] The preset power range may be equal to the current power limit of the welding machine.

[0094] S250: Determine a power change according to a difference between the current actual power and the current limited power.

[0095] Exemplarily, the current actual power is recorded as Power, and the current limited power is recorded as MaxPower, then the power change ΔP=|Power-MaxPower|.

[0096] S260: Determine a voltage change according to the power change and the instantaneous feedback current.

[0097] Exemplarily, the voltage change ΔVolt=ΔP / FdbCurr.

[0098] S270: Determine the set voltage at the current moment according to the set voltage at the previous moment and the voltage change.

[0099] In an optional embodiment, if the current actual power is greater than the current limit power, the set voltage at the current moment is: MaxSetVolt [1] =MaxSetVolt [2] -△Volt, where MaxSetVolt [1] is the set voltage at the current moment, MaxSetVolt [2] is the set voltage at the previous moment, △Volt is the voltage change, so that the target output power of the welder can be adjusted to the vicinity of the limit power by adjusting the set voltage of the welder at the current moment, preventing the actual power of the welder from being too large and damaging the welder components.

[0100] In another optional embodiment, if the current actual power is greater than the current limit power, the set voltage at the current moment is: MaxSetVolt [1] =MaxSetVolt [2] -△Volt / K1, where K1 is the voltage adjustment coefficient, and K1>1, so that the set voltage can be smoothly reduced under the premise that the target output power of the welding machine is close to the limit power, and the problem of unstable welding caused by too fast adjustment of the set voltage of the welding machine resulting in too fast change of the target output power of the welding machine can be further prevented.

[0101] In an optional embodiment, if the current actual power is less than the current limited power, the set voltage at the current moment is: MaxSetVolt[1] =MaxSetVolt [2] +△Volt, that is, in the process of adjusting the set voltage at the current moment according to the set voltage and voltage change at the previous moment, if the current actual power is less than the current limit power, the set voltage is increased in time to make the actual power of the welding machine close to the limit power to meet user needs.

[0102] In another optional embodiment, if the current actual power is less than the current limit power, the set voltage at the current moment is: MaxSetVolt [1] =MaxSetVolt [2] +△Volt / K2, where K2 is the voltage adjustment coefficient, and K2>1, that is, in the process of adjusting the set voltage at the current moment according to the set voltage and voltage change at the previous moment, if the current actual power is less than the current limit power, the set voltage is increased smoothly in time, so that the actual power of the welder is close to the limit power, and the problem of welding instability caused by too fast adjustment of the set voltage of the welder resulting in too fast change of the target output power of the welder is further prevented, so as to meet the needs of users. It can be understood that K1 and K2 can be the same or different, and the embodiment of the present invention does not make specific limitations on this.

[0103] It should be noted that, when the current actual power of the welding machine is greater than the limited power for the first time, the set voltage at the previous moment is equal to the voltage value set by the user.

[0104] S280: Determine the target output power of the welding machine according to the current set voltage.

[0105] In this embodiment, the current actual power of the welding machine is determined according to the product of the instantaneous feedback current and the instantaneous feedback voltage, so that the current actual power of the welding machine obtained is more accurate; when the current actual power of the welding machine is not within the preset power range, the power change is determined according to the difference between the current actual power and the current limit power, and then the voltage change is determined according to the power change and the instantaneous feedback current, and then the set voltage at the current moment is determined according to the set voltage at the previous moment and the voltage change, wherein the set voltage at the current moment can be MaxSetVolt [1] =MaxSetVolt [2] -△Volt, or, MaxSetVolt [1] =MaxSetVolt [2]-△Volt / K1, by adjusting the set voltage of the welding machine at the current moment so that the target output power of the welding machine is close to the limit power, it can prevent the actual power of the welding machine from being too large and damaging the welding machine components. At the same time, it can make the set voltage drop smoothly under the premise that the target output power of the welding machine is close to the limit power, further preventing the set voltage of the welding machine from being adjusted too quickly, resulting in too fast changes in the target output power of the welding machine and causing unstable welding.

[0106] Embodiment 3

[0107] Figure 3 This is a flow chart of a method for limiting the output power of a welding machine provided in the third embodiment of the present invention. Based on the above embodiments, when the setting signal includes a setting current, the embodiment of the present invention further adds steps of how to obtain the current actual power of the welding machine and how to determine the setting signal of the welding machine at the current moment according to the current limit power. This embodiment is applicable to the power limitation of the welding machine when it is working in manual welding or argon arc welding mode. Figure 3 As shown, the welding machine output power limiting method specifically includes:

[0108] S310, obtaining the instantaneous feedback current and instantaneous feedback voltage of the welding machine.

[0109] S320: Determine the current actual power of the welding machine according to the product of the instantaneous feedback current and the instantaneous feedback voltage.

[0110] S330: Obtain the current power limit of the welding machine.

[0111] S340, determine whether the current actual power is within a preset power range; if not, execute S350.

[0112] The preset power range may be equal to the current power limit of the welding machine.

[0113] S350: Determine a power change according to a difference between the current actual power and the current limited power.

[0114] S360: Determine the current change according to the power change and the instantaneous feedback voltage.

[0115] Exemplarily, the current change ΔCurr=ΔP / FdbVolt.

[0116] S370: Determine the current setting at the current moment according to the current setting at the previous moment and the current change.

[0117] In an optional embodiment, if the current actual power is greater than the current limit power, the set current at the current moment is: MaxSetCurr [1] =MaxSetCurr [2]-△Curr, where MaxSetCurr [1] is the set current at the current moment, MaxSetCurr [2] is the set current at the previous moment, △Curr is the current change, so that the target output power of the welder can be adjusted near the limit power by adjusting the set current of the welder at the current moment, preventing the actual power of the welder from being too large and damaging the welder components.

[0118] In another optional embodiment, if the current actual power is greater than the current limit power, the set current at the current moment is: MaxSetCurr [1] =MaxSetCurr [2] -△Curr / K3, where K3 is the current adjustment coefficient, and K3>1, so as to achieve the goal of the welding machine output power near the limit power, so that the set current is smoothly reduced, and further prevent the welding machine from being unstable due to the target output power of the welding machine changing too fast due to the set current adjustment of the welding machine too fast.

[0119] In an optional embodiment, if the current actual power is less than the current limit power, the current setting current at the current moment is: MaxSetCurr [1] =MaxSetCurr [2] +△Curr, that is, in the process of adjusting the set current at the current moment according to the set current and current change at the previous moment, if the current actual power is less than the current limit power, the set current is increased in time to make the actual power of the welding machine close to the limit power to meet user needs.

[0120] In an optional embodiment, if the current actual power is less than the current limit power, the current setting current at the current moment is: MaxSetCurr [1] =MaxSetCurr [2] +△Curr / K4, where K4 is the current adjustment coefficient, and K4>1, that is, in the process of adjusting the current setting at the current moment according to the current setting and current change at the previous moment, if the current actual power is less than the current limit power, the set current is increased smoothly, so that the actual power of the welding machine is close to the limit power, and the problem of welding instability caused by too fast adjustment of the set current of the welding machine resulting in too fast change of the target output power of the welding machine is further prevented, so as to meet the needs of users. It can be understood that K3 and K4 can be the same or different, and the embodiment of the present invention does not make specific limitations on this.

[0121] It should be noted that, when the current actual power of the welding machine is greater than the limited power for the first time, the set current at the previous moment is equal to the current value set by the user.

[0122] S380: Determine the target output power of the welding machine according to the current setting.

[0123] In this embodiment, the current actual power of the welding machine is determined according to the product of the instantaneous feedback current and the instantaneous feedback voltage, so that the current actual power of the welding machine obtained is more accurate; when the current actual power of the welding machine is not within the preset power range, the power change is determined according to the difference between the current actual power and the current limit power, and then the current change is determined according to the power change and the instantaneous feedback voltage, and then the set current at the previous moment is determined according to the set current and the current change, wherein the set current at the current moment can be MaxSetCurr [1] =MaxSetCurr [2] -△Curr, or,MaxSetCurr [1] =MaxSetCurr [2] -△Curr / K3, by adjusting the current setting current of the welding machine at the current moment, the target output power of the welding machine is close to the limit power, preventing the actual power of the welding machine from being too large and damaging the welding machine components. At the same time, it realizes the premise that the target output power of the welding machine is close to the limit power, and the set current is smoothly reduced, further preventing the set current of the welding machine from being adjusted too quickly, resulting in too fast changes in the target output power of the welding machine and causing unstable welding.

[0124] Embodiment 4

[0125] Figure 4 This is a flowchart of a method for limiting the output power of a welding machine provided in the fourth embodiment of the present invention. Based on the above embodiments, the embodiment of the present invention further adds steps of how to obtain the current actual power of the welding machine when the setting signal includes a setting voltage, and how to determine the setting signal of the welding machine at the current moment according to the current limit power. This embodiment is applicable to the power limitation of the welding machine when it is working in the gas shielded welding mode. Figure 4 As shown, the welding machine output power limiting method specifically includes:

[0126] S410, obtaining the set voltage at the previous moment and the instantaneous feedback current of the welding machine.

[0127] The instantaneous feedback current may be the actual current of the welding machine at the current moment. In an optional embodiment, the instantaneous feedback current of the welding machine may be the current after filtering the actual current of the welding machine at the current moment.

[0128] S420, determining the current actual power of the welding machine according to the product of the instantaneous feedback current and the set voltage at the previous moment.

[0129] In an exemplary embodiment, the instantaneous feedback current of the welding machine is recorded as FdbCurr, and the set voltage at the previous moment is recorded as SetVolt, then the current actual power of the welding machine Power=SetVolt*FdbCurr.

[0130] S430: Obtain the current power limit of the welding machine.

[0131] S440, determine whether the current actual power is within a preset power range; if not, execute S450.

[0132] The preset power range may be less than or equal to the current power limit of the welding machine.

[0133] S450: Determine the quotient of the current limited power and the instantaneous feedback current as the set voltage at the current moment.

[0134] Exemplarily, the current limited power is recorded as MaxPower, and the set voltage at the current moment MaxSetVolt=MaxPower / FdbCurr.

[0135] In an optional embodiment, if the current actual power is within the preset power range, that is, the current actual power is less than or equal to the limited power of the welding machine, the set voltage of the welding machine at the current moment is determined as the user-set voltage value, thereby meeting the user's power demand for the welding machine.

[0136] S460: Determine the target output power of the welding machine according to the setting signal at the current moment.

[0137] In this embodiment, the current actual power of the welding machine is determined according to the product of the instantaneous feedback current and the set voltage at the previous moment. Therefore, when the current actual power of the welding machine is not within the preset power range, the quotient of the current limit power and the instantaneous feedback current is determined as the set voltage at the current moment. This achieves the goal of limiting the set voltage of the welding machine so that the target output power of the welding machine is within the limit power, preventing the actual power of the welding machine from being too large and damaging the welding machine components, thereby improving the service life of the welding machine.

[0138] Embodiment 5

[0139] Figure 5 This is a flowchart of a method for limiting the output power of a welding machine provided in Embodiment 5 of the present invention. Based on the above embodiments, the embodiment of the present invention further adds steps of how to obtain the current actual power of the welding machine when the setting signal includes the setting current, and how to determine the setting signal of the welding machine at the current moment according to the current limiting power. This embodiment is applicable to the power limitation of the welding machine when it is working in manual welding or argon arc welding mode, refer to Figure 5 As shown, the welding machine output power limiting method specifically includes:

[0140] S510, obtaining the set current at the previous moment and the instantaneous feedback voltage of the welding machine.

[0141] The instantaneous feedback voltage may be the actual voltage of the welding machine at the current moment. In an optional embodiment, the instantaneous feedback voltage of the welding machine may be a voltage after filtering the actual voltage of the welding machine at the current moment.

[0142] S520, determining the current actual power of the welding machine according to the product of the instantaneous feedback voltage and the set current at the previous moment.

[0143] In an exemplary embodiment, the instantaneous feedback voltage of the welding machine is recorded as FdbVolt, and the set current at the previous moment is recorded as SetCurr, then the current actual power of the welding machine Power=SetCurr*FdbVolt.

[0144] S530: Obtain the current power limit of the welding machine.

[0145] S540, determine whether the current actual power is within a preset power range; if not, execute S550.

[0146] The preset power range may be less than or equal to the current power limit of the welding machine.

[0147] S550: Determine the quotient of the current limited power and the instantaneous feedback voltage as the set current at the current moment.

[0148] Exemplarily, the current limited power is recorded as MaxPower, and the set current MaxSetCurr at the current moment = MaxPower / FdbVolt.

[0149] In an optional embodiment, if the current actual power is within the preset power range, that is, the current actual power is less than or equal to the limited power of the welding machine, the set current of the welding machine at the current moment is determined as the user-set current value, thereby meeting the user's power demand for the welding machine.

[0150] S560: Determine the target output power of the welding machine according to the current setting current.

[0151] In this embodiment, the current actual power of the welding machine is determined according to the product of the instantaneous feedback voltage and the set current at the previous moment. Therefore, when the current actual power of the welding machine is not within the preset power range, the quotient of the current limit power and the instantaneous feedback voltage is determined as the set current at the current moment. This achieves the goal of limiting the set voltage of the welding machine so that the target output power of the welding machine is within the limit power, preventing the actual power of the welding machine from being too large and damaging the welding machine components, thereby improving the service life of the welding machine.

[0152] Embodiment 6

[0153] This embodiment provides a device for limiting the output power of a welding machine. The device can be implemented in the form of hardware and / or software and can be integrated into a controller of the welding machine. Figure 6 This is a schematic diagram of the structure of the welding machine output power limiting device provided in the sixth embodiment of the present invention, as shown in FIG. Figure 6 As shown, the restriction device comprises:

[0154] The power acquisition module 610 is used to acquire the current actual power and the current limited power of the welding machine.

[0155] The determination module 620 is used to determine whether the current actual power is within a preset power range.

[0156] The setting signal determination module 630 is used to determine the setting signal of the welding machine at the current moment according to the current limited power; the setting signal includes a setting voltage or a setting current.

[0157] The target output power determination module 640 is used to determine the target output power of the welding machine according to the setting signal at the current moment.

[0158] The welding machine output power limiting device provided in the embodiment of the present invention can execute the welding machine output power limiting method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method. The similarities can be referred to the above description.

[0159] Embodiment 7

[0160] Figure 7 A structural block diagram of a welding machine is provided for the seventh embodiment of the present invention, as shown in FIG. Figure 7 As shown, the welding machine 1 at least includes a controller 2, and the controller 2 is used to execute the welding machine output power limiting method provided by any embodiment of the present invention.

[0161] The welder has the corresponding structure and features for executing the welder output power limiting method provided in any embodiment of the present invention, and can achieve the beneficial effects of the welder output power limiting method provided in the embodiment of the present invention. The similarities can be referred to the above description.

[0162] Embodiment 8

[0163] Based on the same concept, an embodiment of the present invention further provides a computer-readable storage medium, which stores computer instructions. The computer instructions are used to enable a processor to implement the restriction method provided in any of the above embodiments when executed.

[0164] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0165] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding machine output power limiting method, characterized in that: include: Get the current actual power and current limited power of the welding machine; Determining whether the current actual power is within a preset power range; If not, determining the setting signal of the welding machine at the current moment according to the current limited power; the setting signal includes a setting voltage or a setting current; Determining the target output power of the welding machine according to the setting signal at the current moment; Among them, obtaining the current actual power of the welding machine includes: Obtaining instantaneous feedback current and instantaneous feedback voltage of the welding machine; Determining the current actual power of the welding machine according to the product of the instantaneous feedback current and the instantaneous feedback voltage; When the setting signal includes the setting voltage, determining the setting signal of the welding machine at the current moment according to the current limit power includes: Determining a power change according to a difference between the current actual power and the current limited power; Determining a voltage change according to the power change and the instantaneous feedback current; When the current actual power is greater than the current limited power, the set voltage at the current moment is: MaxSetVolt [1] =MaxSetVolt [2] -△Volt; or, MaxSetVolt [1] =MaxSetVolt [2] -△Volt / K1; When the current actual power is less than the current limited power, the set voltage at the current moment is: MaxSetVolt [1] =MaxSetVolt [2] +△Volt; or, MaxSetVolt [1] =MaxSetVolt [2] +△Volt / K2; Among them, MaxSetVolt [1] is the set voltage at the current moment, MaxSetVolt [2] is the set voltage at the previous moment, △Volt is the voltage change, K1 and K2 are voltage adjustment coefficients, K1>1, K2>1.

2. The welding machine output power limiting method according to claim 1, characterized in that: When the setting signal includes the setting current, determining the setting signal of the welding machine at the current moment according to the current limiting power includes: Determining a power change according to a difference between the current actual power and the current limited power; Determining a current change amount according to the power change amount and the instantaneous feedback voltage; The set current at the current moment is determined according to the set current at the previous moment and the current change.

3. The welding machine output power limiting method according to claim 2, characterized in that: Determining the set current at the current moment according to the set current at the previous moment and the current change amount includes: When the current actual power is greater than the current limited power, the set current at the current moment is: MaxSetCurr [1] =MaxSetCurr [2] -△Curr; or MaxSetCurr [1] =MaxSetCurr [2] -△Curr / K3; When the current actual power is less than the current limited power, the set current at the current moment is: MaxSetCurr [1] =MaxSetCurr [2] +△Curr; or, MaxSetCurr [1] =MaxSetCurr [2] +△Curr / K4; Among them, MaxSetCurr [1] is the set current at the current moment, MaxSetCurr [2] is the set current at the previous moment, △Curr is the current change, K3 and K4 are current adjustment coefficients, K3>1, K4>1.

4. The welding machine output power limiting method according to claim 1, characterized in that: When the setting signal includes a setting voltage, obtaining the current actual power of the welding machine includes: Acquiring the set voltage at the previous moment and the instantaneous feedback current of the welding machine; The current actual power of the welding machine is determined according to the product of the instantaneous feedback current and the set voltage at the previous moment.

5. The welding machine output power limiting method according to claim 4, characterized in that: Determining the setting signal of the welding machine at the current moment according to the current limited power includes: The quotient of the current limited power and the instantaneous feedback current is determined as the set voltage at the current moment.

6. The welding machine output power limiting method according to claim 1, characterized in that: When the setting signal includes a setting current, obtaining the current actual power of the welding machine includes: Acquiring the set current at the previous moment and the instantaneous feedback voltage of the welding machine; The current actual power of the welding machine is determined according to the product of the instantaneous feedback voltage and the set current at the previous moment.

7. The welding machine output power limiting method according to claim 6, characterized in that: Determining the setting signal of the welding machine at the current moment according to the current limited power includes: The quotient of the current limited power and the instantaneous feedback voltage is determined as the set current at the current moment.

8. The welding machine output power limiting method according to claim 1, characterized in that: Also includes: If the current actual power is within the preset power range, the setting signal at the previous moment is determined as the setting signal at the current moment.

9. A welding machine output power limiting device, used to implement the welding machine output power limiting method according to any one of claims 1 to 8, characterized in that: include: A power acquisition module is used to obtain the current actual power and current limited power of the welding machine; A judging module, used to judge whether the current actual power is within a preset power range; A setting signal determination module, used to determine the setting signal of the welding machine at the current moment according to the current limited power; the setting signal includes a setting voltage or a setting current; The target output power determination module is used to determine the target output power of the welding machine according to the setting signal at the current moment.

10. A welding machine, characterized in that: At least a controller; The controller is used to execute the welding machine output power limiting method according to any one of claims 1-8.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the welding machine output power limiting method according to any one of claims 1 to 8 when executed.

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