Inverter welding machine powered by double power supplies

Abstract

The utility model discloses a dual-power-supply inverter welding machine. The solution relates to the field of welding, in particular to a welding machine which can be powered by a direct-current and alternating-current power supply. The inverter welding machine comprises a shell with a circuit, wherein an alternating current-direct current conversion circuit is contained in the shell; the welding mode switch can be provided with a power supply of the welding machine and is mounted on the shell; the battery pack power supply connector is installed on the shell and used for supplying power from an external battery pack, the power grid power supply connector is installed on the shell, the welding mode switch can be connected to a circuit of the welding machine, the power grid power supply connector is connected to the first position, and the battery pack power supply connector is connected to the second position. When the change-over switch is at the first position, the power grid power supply connector can be connected to the input end of the alternating current-direct current conversion circuit, and when the change-over switch is at the second position, the battery pack power supply connector can be connected to the output end of the alternating current-direct current conversion circuit.

Description

Technical Field

[0001] The solution relates to the field of welding, in particular to welding machines that can be powered by DC and AC power supplies. Background Art

[0002] There is a known inverter welding machine for manual welding using a rod electrode (published on December 20, 2012, RU 122931 U1). This known utility model aims to create a new improved welding machine that can meet the need to reduce equipment and consumable costs when connecting steel blanks with wall thicknesses in the range of 0.5 - 3.5 mm, compared with existing equipment for welding in protective gases and inert gases and for welding with flux-cored wires in air. To achieve the above technical effects, the inverter welding machine for manual welding of a rod electrode includes a power supply device with a high-frequency converter that converts network alternating current into rectified current, and two output terminals for outputting rectified current with positive and negative voltages; two power cables, one cable for connecting one terminal to the electrode holder and the other cable for connecting the other terminal to the workpiece, and a pulse generator connected to the high-frequency converter, which includes two input connectors for providing a control voltage to turn on the pulse generator and the high-frequency converter. When the control voltage is applied to its first input connector, the no-load voltage or the background current of the standby arc is maintained at the output of the welding machine. When the control voltage is applied to its second input connector, it can switch the welding machine current from the background current of the standby arc to the peak current of an adjustable value, a locking switch with a pair of normally open contacts, and a toggle switch accessible to the operator. An execution circuit for controlling the welding machine is connected to the pulse generator and includes a control voltage source, a return button switch with a pair of normally open contacts installed on the insulating handle of the electrode chuck; a welding machine output current relay sensor with a pair of normally open contacts; a relay timer with a pair of normally open contacts. Moreover, the relay timer is designed to close its contacts within a specified time interval when the control voltage is applied. The contacts of the locking switch are connected in the circuit, and the control voltage can be applied to the first input connector of the pulse generator through these contacts. The contacts of the current relay sensor and the contacts of the button switch are connected in series in a circuit, and the control voltage can be applied to the relay timer through this circuit. The contacts of the relay timer and the contacts of the above button switch are connected in series in a circuit, and the control voltage can be applied to the second input connector of the above pulse generator through this circuit.

[0003] However, this solution cannot use a battery to power the welding machine.

[0004] Known DC welding machine (RU2182060C1, published on May 10, 2002). This known solution relates to electrical engineering and can be used as a DC welding arc power source in various fields of the national economy. According to the first scheme, the instrument includes a power transformer, a main rectifier and an auxiliary rectifier, a power supply and a storage choke. The power transformer is designed as a saturable transformer. The power supply choke is connected in series with the primary winding of the power transformer. One lead of its auxiliary winding is connected to one input lead of the auxiliary rectifier and is electrically connected to the secondary winding. The second lead is connected to the other input lead of the auxiliary rectifier through the storage choke. Alternatively, one lead of the auxiliary winding is connected to one input lead of the auxiliary rectifier, electrically connected to the secondary winding through the storage choke and the second lead, and is connected to the other input lead of the auxiliary rectifier. According to the second embodiment, the instrument includes an auxiliary transformer, a power supply and a storage choke. The power transformer is designed as a saturable transformer. The power supply choke is connected in series with the primary winding of the power transformer. The primary winding of the auxiliary transformer is connected in parallel with its secondary winding. One lead of this winding is connected to one input lead of the auxiliary rectifier, either directly in series or in series with one lead of its secondary winding through the storage choke. The other lead of the secondary winding is connected to the other input lead of the auxiliary rectifier through the storage choke or directly. This design of the welding machine can reduce its size and improve the reliability of operation.

[0005] However, this solution cannot use a battery to power the welding machine.

[0006] The known MicorStick 160 AccuReady battery welding machine (https: / / www.shtorm-its.ru / catalog / svarochnyie-apparatyi-serii-micorstick / ) has an external battery pack that is connected to the welding machine through a connector on the rear panel of the machine.

[0007] However, this solution cannot easily switch between grid and battery operation. When switching, the battery cable needs to be unplugged from the connector and then the grid power cord needs to be inserted, which takes a lot of time and effort.

[0008] The known battery welding machine LK-power ARC-140i with an integrated battery pack (https: / / linksvar.com / akkumulyatornyj-svarochnyj-apparat-lk-power-ars-140i-asa-hw-604 / ) has been selected as the prototype. This welding machine can use either the grid (if the grid is connected) or the battery (if the grid is not connected).

[0009] However, this solution cannot conveniently switch between grid and battery operations. The only way to switch is to unplug the plug from the socket or disconnect it from the connector on the rear panel, which takes a lot of time and effort.

[0010] The welding machine (US8759714B2, published on June 24, 2014) known to be selected as the prototype contains a changeover switch for power supply from two power sources, direct current and alternating current. However, in this solution, the welding machine contains a generator for forming alternating current, which greatly increases the weight of the welding machine and greatly reduces its convenience of use when the welding machine needs to be moved. When the alternating current power source is selected, the welding is alternating current welding, and when the battery power source is selected, the welding is direct current welding, which is very inconvenient because alternating current welding is only used for specific applications.

[0011] Therefore, in the known solution, the changeover switch switches the welding machine to the alternating current or direct current operation mode, and more often the direct current operation mode is required. That is to say, the known solution is not convenient to use in the alternating current operation mode. Summary of the Utility Model

[0012] In one aspect of the present utility model, an inverter welding machine powered by dual power sources is disclosed, including:

[0013] - A housing with a circuit, which contains an AC-DC conversion circuit;

[0014] - A welding mode switch capable of setting the power source of the welding machine, installed on the housing;

[0015] - A battery pack power connector installed on the housing for power supply from an external battery pack,

[0016] It is characterized in that it further includes

[0017] - A grid power connector installed on the housing,

[0018] Moreover, the welding mode switch can be connected to the circuit of the welding machine, connecting the grid power connector in the first position and the battery pack power connector in the second position,

[0019] When the changeover switch is in the first position, it can connect the grid power connector to the input end of the AC-DC conversion circuit, and when in the second position, it can connect the battery pack power connector to the output end of the AC-DC conversion circuit.

[0020] In other aspects, it is disclosed that the changeover switch is a three-position switch, where the first position of the switch corresponds to the grid power, the second position corresponds to the power of the battery pack, and the third position corresponds to the off state of the welding machine; the grid power connector and the battery pack power connector are installed on the same side of the welding machine; the grid power connector and the battery pack power connector are different.

[0021] The main task of the proposed solution is to create a welding machine that is convenient to use and can be powered either by the power grid or by an external battery pack.

[0022] The essence of the solution lies in that the welding machine includes two input connectors, one for supplying alternating current from the power grid power supply and the other for supplying direct current from an external battery pack. To select the power supply, a changeover switch is required to connect the welding machine circuit to different power supplies, and the connection points of different power supplies to the welding machine circuit are different.

[0023] Due to the convenient connection of different power supplies, the technical effect achieved by this solution is to improve the usability of the welding machine under various conditions. Description of the Drawings

[0024] Figure 1 Shows the appearance of the front panel of the welding machine with a changeover switch.

[0025] Figure 2 Shows the appearance of the rear panel of the welding machine with two connectors.

[0026] Figure 3 Shows a partial circuit diagram connecting two power supplies. Detailed Description of the Invention

[0027] The proposed welding machine is an improved version of an inverter welding machine, with the added ability to operate using an external battery pack.

[0028] The working principle of the inverter is as follows. Alternating current with a voltage of 220 volts is supplied from the power grid to the circuit of the welding machine and is converted into direct current by the first converter of the inverter circuit. The resulting direct current is converted into high-frequency alternating current by the second converter of the inverter circuit. Then the high-frequency alternating voltage is reduced, thereby greatly increasing the current intensity. The resulting high-amperage and low-voltage high-frequency current is converted into direct current by the third AC-DC converter and delivered to the output terminal of the welding machine.

[0029] This kind of machine is lightweight and powerful, but its mobility is limited by the length of the wire, and there will be some fluctuations in the output current, which is crucial for welding complex objects (such as thin plates, etc.).

[0030] If the voltage level is unstable and periodically drops, then working from the power grid will become inconvenient, and the unstable current parameters on the electrodes must be adjusted, which will cause difficulties in welding and may result in unqualified products. If it is necessary to regularly go to places where the power cord cannot reach, then the welding machine can be conveniently connected to an external battery pack to perform the required work without extending the wire, moving the generator, etc.

[0031] To address these deficiencies, the inventor proposes to provide the function of selecting a power source: the power grid or an external battery pack. For this purpose, a battery pack power connector and a power conversion switch are installed on the welding machine housing ( Figure 1 ).

[0032] Figure 1 The following components are shown:

[0033] 100 – Welding machine housing,

[0034] 101 – Output connector of the welding machine,

[0035] 102 – Output current regulator,

[0036] 103 – Output current indicator,

[0037] 104 – Power conversion switch.

[0038] The battery pack is connected to the welding machine via a power cord. At the same time, the welder can select the power source through the conversion switch 104 on the welding machine housing.

[0039] The conversion switch 104 is preferably installed on the front panel, in the same position as the regulator 102, because it is much more convenient to install the control components on the front panel than on the rear panel or side panels or scattered at different parts of the housing 100.

[0040] Figure 2 is a simplified view of the rear panel of the welding machine, showing the housing 100, the mains power connector 201 and the battery pack power connector 202. Both connectors 201 and 202 are preferably located on the rear panel, because this can improve the convenience of using the welding machine compared to dispersing the connectors at different parts of the housing 100. In addition, the shapes of the connectors 201 and 202 are preferably different, so that the welder will not insert the plug into the wrong connector, thus improving the convenience of using the welding machine.

[0041] The proposed welding machine is a single device both structurally and functionally, and all its components are interconnected at the manufacturing plant through assembly operations. The output connector 101, the regulator 102, the indicator 103, the conversion switch 104, the connector 201 and the connector 202 are installed in the housing 100 by means of clamps, threaded connections or other suitable means to be firmly fixed in the housing 100.

[0042] The only function of the proposed welding machine is to weld metal objects.

[0043] Figure 3 The proposed welding machine is shown, together with a circuit diagram:

[0044] 301 – Circuit diagram block,

[0045] 302 - AC / DC converter block.

[0046] Block 302 is part of block 301 and is crucial for the welding machine's circuit. Since the DC current from the external battery pack bypasses block 302 through connector 202 and transfer switch 104 as it doesn't require conversion, and the AC power from the power grid enters the input of block 302 through connector 201 and transfer switch 104 and is converted to DC power.

[0047] Since the inverter welding machine includes two AC / DC converters 302, the current from the external battery pack can be directed to the output of the first or second converter 302 according to the output parameters of the external battery pack. This is not the subject of this solution as a technician in this field can assemble the battery pack and connect it to the appropriate location of the welding machine circuit block 301 without much effort.

[0048] Working description

[0049] When using the proposed welding machine, the welder connects it to the power grid and the battery pack, turns on the power grid using transfer switch 104 and starts working. If power grid problems affect the welding quality and convenience, the welder can turn on the battery pack power through transfer switch 104. Since the operating time of the battery pack is limited by the battery charge, some solutions implement the function of charging the battery pack when the power grid power is selected using transfer switch 104. For this purpose, the housing 100 also includes a battery pack charging device that is powered by the power grid power and then supplies the charging current to the battery pack.

[0050] In this solution, the power grid power also means the power from a generator, and the output parameters of the generator may be less stable compared to the city power grid.

[0051] Using an external battery pack instead of an internal battery pack reduces the weight of the welding machine and makes it more convenient to use.

[0052] Embodiment 1

[0053] In one of the solutions, transfer switch 104 is a three - position transfer switch 104, where the first position corresponds to the power grid power, the second position of transfer switch 104 corresponds to the power of the battery pack, and the third position of transfer switch 104 corresponds to the off state of the welding machine.

[0054] The terms "first", "second", "third" are only used to distinguish the positions of the transfer switch and do not indicate their mutual arrangement.

[0055] In the third position of the changeover switch 104, the welding machine is in the off state and there is no voltage at its output terminals, which is convenient for the welder as he does not have to unplug the plug from the connector and does not have to use the following two control components: the three-position changeover switch 104 and the on / off switch.

[0056] Furthermore, in the third position of the changeover switch 104, the machine is in the off state, which improves the safety of using the welding machine as there is no current flowing to the electrode in this position and the welder cannot get an electric shock by accident.

[0057] The possibility of battery pack power supply increases the safety of working under complex conditions (at height, in spaces where the power supply line may be damaged due to the handling of the welding machine, etc.) as a long power supply line may get caught on something, may pull the welding machine, may pass under the welder's feet, etc.

[0058] The embodiments are not limited to the above examples, and other embodiments of the solution will be apparent to the expert in the art from the information in the description and the knowledge of the prior art, without departing from the essence and scope of the solution.

[0059] Unless otherwise stated, a singular reference to a component does not exclude a plurality of components.

[0060] Although the exemplary embodiments have been described and shown in detail in the drawings, it should be understood that these embodiments are merely illustrative and are not intended to limit the broader solution, and the solution should not be limited to the specific arrangements and structures shown and described, as various other modifications may be apparent to those skilled in the relevant art.

[0061] The features mentioned in the different dependent claims of the claims, and the embodiments disclosed in the respective parts of the description, may be combined to achieve a useful effect, even if the possibility of such combination is not explicitly disclosed.

Claims

1. Inverter welding machine powered by dual power supplies, comprising: - A housing with a circuit, which includes an AC-DC conversion circuit; - A welding mode switch capable of setting the power supply of the welding machine, installed on the housing; - A battery pack power connector installed on the housing for power supply from an external battery pack, - A mains power connector installed on the housing, The welding mode switch can be connected to the circuit of the welding machine, connecting to the mains power connector in the first position and connecting to the battery pack power connector in the second position, When the changeover switch is in the first position, it can connect the mains power connector to the input end of the AC-DC conversion circuit, and when in the second position, it can connect the battery pack power connector to the output end of the AC-DC conversion circuit.

2. The inverter welding machine according to claim 1, wherein the changeover switch is a three-position changeover switch, and the first position of the changeover switch corresponds to the mains power, the second position corresponds to the power supply of the battery pack, and the third position corresponds to the off state of the welding machine.

3. The inverter welding machine according to claim 1, wherein the mains power connector and the battery pack power connector are installed on the same side of the welding machine.

4. The inverter welding machine according to claim 1, wherein the mains power connector and the battery pack power connector are different.

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