Multi-voltage input control device and welding machine

Abstract

The invention discloses a multi-voltage input control device and a welding machine, and the multi-voltage input control device comprises an input end group, an open-phase detection module, an inter-phase voltage detection module, a connection end switching module, an inter-phase voltage switching module and a voltage transformation module, the inter-phase voltage detection module is used for detecting inter-phase voltage information between electrified phase connection ends, and the connection end switching module is provided with a first electrified end and a second electrified end. The connecting end switching module is connected with the open-phase detection module so as to correspondingly connect each phase connecting end with a first electrified end and a second electrified end according to electrified phase information, and the interphase voltage switching module is connected with the first electrified end, the second electrified end and the primary winding; the interphase voltage switching module changes the number of winding turns of the first live-line end and the second live-line end connected to the primary winding according to the interphase voltage information, can be compatible with more voltage levels, prevents power supply faults caused by wiring errors of a user, and is convenient and reliable to use.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic equipment, and in particular to a multi-voltage input control device and a welding machine. Background Art

[0002] Welding machines are widely used in the metal processing industry. Due to the different power voltages supplied by power grids in different regions and countries, there is also a distinction between civil electricity and industrial electricity in different regions. For example, there are single-phase 220V, three-phase 110V, three-phase 220V, three-phase 380V and other power supplies. At present, the power drive device in the welding machine can only modulate a single input voltage, and the input voltage range is limited.

[0003] Moreover, in actual use, the user needs to connect the AC power supply to the input module of the power drive device. During the connection process, there are situations where the phases are misconnected or the single-phase power supply cannot be adapted to the three-phase input module, which is inconvenient to use and has great restrictions and limitations. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a multi-voltage input control device and a welding machine, which can be compatible with more voltage levels, automatically adjust the voltage, and is convenient and reliable to use.

[0005] A multi-voltage input control device according to an embodiment of the first aspect of the present invention comprises: an input terminal group, comprising a plurality of phase connection terminals, the plurality of phase connection terminals being used to be connected to at least two phases of an AC power supply; a phase loss detection module, connected to the input terminal group, the phase loss detection module being used to detect energized phase information, wherein the energized phase information is used to characterize which phase connection terminals of the plurality of phase connection terminals are energized; a phase-to-phase voltage detection module, connected to the input terminal group, the phase-to-phase voltage detection module being used to detect phase-to-phase voltage information between the energized phase connection terminals; and a connection terminal switching module, the connection terminal switching module having a first energized terminal and a second energized terminal. The connection end switching module is connected to each phase connection end, and the connection end switching module is connected to the phase loss detection module to connect at least two energized phase connection ends of each phase connection end to the first energized end and the second energized end respectively according to the energized phase information; an inter-phase voltage switching module and a transformer module, the transformer module includes a primary winding and a secondary winding coupled to each other, the inter-phase voltage switching module is respectively connected to the first energized end, the second energized end and the primary winding, and the inter-phase voltage switching module changes the number of winding turns of the first energized end and the second energized end connected to the primary winding according to the inter-phase voltage information.

[0006] A multi-voltage input control device according to an embodiment of the present invention has at least the following beneficial effects:

[0007] In the multi-voltage input control device of the present invention, the user connects the input terminal group to the AC power supply according to actual conditions, and multiple phase connection terminals are connected to multiple phases in the AC power supply. The phase loss detection module detects which phase connection terminals among the multiple phase connection terminals are energized to form energized phase information. The connection terminal switching module selects to connect the energized phase among the multiple phase connection terminals to the primary winding of the transformer module according to the energized phase information. In addition, the phase-to-phase voltage detection module detects the phase-to-phase voltage information between the energized phase connection terminals. The phase-to-phase voltage switching module changes the number of winding turns of the first energized terminal and the second energized terminal connected to the primary winding according to the magnitude of the phase-to-phase voltage. The change in the number of winding turns of the primary winding keeps the output voltage of the secondary winding within a certain range to supply power to the rear circuit module. The present design is compatible with more voltage levels and automatically adapts to the input of single-phase or three-phase AC power supply. It can also prevent power supply failures caused by user wiring errors. It is convenient and reliable to use.

[0008] According to some embodiments of the present invention, there are three phase connection terminals, which are respectively a first phase connection terminal, a second phase connection terminal and a third phase connection terminal, and the input terminal group is used to connect to a single-phase AC power supply or a three-phase AC power supply.

[0009] According to some embodiments of the present invention, the phase-to-phase voltage switching module includes a first switching switch and a first driving member, the primary winding includes a first transformer end and at least a second transformer end and a third transformer end, wherein the number of winding turns between the first transformer end and the second transformer end is less than the number of winding turns between the first transformer end and the third transformer end, the first live end is connected to the first transformer end, and the second live end is connected to the first switching switch, and the phase-to-phase voltage detection module is connected to the first driving member to control the first driving member to drive the first switching switch to switch between at least a first connection state and a second connection state according to the phase-to-phase voltage information, wherein, in the first connection state, the first switching switch is switched to connect to the second transformer end so that the second live end and the second transformer end are conductive, and in the second connection state, the first switching switch is switched to connect to the third transformer end so that the second live end and the third transformer end are conductive.

[0010] According to some embodiments of the present invention, the phase-to-phase voltage detection module includes a rectifier unit, a phase voltage identification unit and a first drive unit, the input end of the rectifier unit is respectively connected to each of the phase connection ends to process the AC phase-to-phase voltage into a DC phase-to-phase voltage signal, the input end of the phase voltage identification unit is connected to the output end of the rectifier unit to determine whether the phase-to-phase voltage is greater than a voltage threshold based on the phase voltage signal, the phase voltage identification unit forms a first trigger signal based on the judgment result, the controlled end of the first drive unit is connected to the output end of the phase voltage identification unit, and the first drive unit is connected to the first drive element to control the first drive element to switch between at least a first connection state and a second connection state based on the first trigger signal.

[0011] According to some embodiments of the present invention, the rectifier unit includes a first rectifier bridge and a second rectifier bridge, the first phase connection end is connected to the first input end of the first rectifier bridge, the second phase connection end is respectively connected to the second input end of the first rectifier bridge and the first input end of the second rectifier bridge, the third phase connection end is connected to the second input end of the second rectifier bridge, the output end of the first rectifier bridge and the output end of the second rectifier bridge are connected in parallel and connected to the input end of the phase voltage identification unit.

[0012] According to some embodiments of the present invention, the phase voltage identification unit includes a voltage regulator tube Z5, a resistor R3 and a diode D3, the first driving unit includes a photoelectric coupler N3, a semiconductor switch tube Q6, a resistor R13, a resistor R14, a resistor R15, a resistor R16 and a semiconductor switch tube Q7, the cathode of the voltage regulator tube Z5 is respectively connected to the positive output end of the first rectifier bridge and the positive output end of the second rectifier bridge, the anode of the voltage regulator tube Z5 is connected to the head end of the resistor R3, the tail end of the resistor R3 is connected to the anode of the light emitter of the photoelectric coupler N3, the cathode of the light emitter of the photoelectric coupler N3 is connected to the anode of the diode D3, the cathode of the diode D3 is respectively connected to the cathode output end of the first rectifier bridge and the cathode of the diode D3. The negative output end of the second rectifier bridge is connected, the input end of the light receiver of the photoelectric coupler N3 is connected to the head end of the resistor R13, the output end of the light receiver of the photoelectric coupler N3 is respectively connected to the head end of the resistor R5 and the controlled end of the switch tube Q6, the input end of the switch tube Q6 is respectively connected to the head end of the resistor R14, the head end of the resistor R16 and the controlled end of the switch tube Q7, the tail end of the resistor R13 and the tail end of the resistor R14 are both connected to the power supply, the tail end of the resistor R15, the tail end of the resistor R16 and the output end of the switch tube Q6 are all grounded, the switch tube Q7 and the first driving component are connected in series to form at least part of the first driving branch, and the first driving branch is connected to the power supply.

[0013] According to some embodiments of the present invention, the connection end switching module includes a second switching switch, a second driving member, a third switching switch and a third driving member, the second switching switch is connected to the second live end, the third switching switch is connected to the first live end, the phase loss detection module is connected to the second driving member and the third driving member respectively, and the phase loss detection module controls the second driving member to drive the second switching switch to switch between at least a third connection state and a fourth connection state according to the live phase information, wherein, in the third connection state, the second switching switch is connected to the second phase connection end so that the second phase connection end is connected to the second live phase The electrical end is connected, in the fourth connection state, the second switching switch is connected to the first phase connection end so that the first phase connection end is connected to the second energized end, and the phase loss detection module controls the third driving member according to the energized phase information to drive the third switching switch to switch between at least the fifth connection state and the sixth connection state, wherein, in the fifth connection state, the third switching switch is connected to the first phase connection end so that the first phase connection end is connected to the first energized end, and in the sixth connection state, the third switching switch is connected to the third phase connection end so that the third phase connection end is connected to the first energized end.

[0014] According to some embodiments of the present invention, the phase loss detection module includes a first charged detection unit, a second charged detection unit and a second driving unit, the first charged detection unit is respectively connected to the first phase connection end and the second phase connection end to form a second trigger signal according to the result of whether the first phase connection end and the second phase connection end are charged, the second charged detection unit is respectively connected to the second phase connection end and the third phase connection end to form a third trigger signal according to the result of whether the second phase connection end and the third phase connection end are charged, the input end of the second driving unit is respectively connected to the output end of the first charged detection unit and the output end of the second charged detection unit, the output end of the second driving unit is respectively connected to the second driving member and the third driving member, and the second driving unit controls the second driving member to switch between at least the third connection state and the fourth connection state according to the second trigger signal and the third trigger signal.

[0015] According to some embodiments of the present invention, the first charged detection unit includes a voltage regulator tube Z1, a resistor R1 and a diode D1, the second charged detection unit includes a voltage regulator tube Z3, a resistor R2 and a diode D2, the second driving unit includes a photoelectric coupler N1, a photoelectric coupler N2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a semiconductor switch tube Q1, a semiconductor switch tube Q4, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a semiconductor switch tube Q2, a semiconductor switch tube Q3 and a semiconductor switch tube Q5; the first phase connection end is connected to the negative electrode of the voltage regulator tube Z1, and the positive electrode of the voltage regulator tube Z1 is connected to the first end of the resistor R1. The tail end of the resistor R1 is connected to the positive electrode of the light emitter of the photoelectric coupler N1, the negative electrode of the light emitter of the photoelectric coupler N1 is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is respectively connected to the second phase connection end and the negative electrode of the voltage regulator tube Z3, the positive electrode of the voltage regulator tube Z3 is connected to the head end of the resistor R2, the tail end of the resistor R2 is connected to the positive electrode of the light emitter of the photoelectric coupler N2, the negative electrode of the light emitter of the photoelectric coupler N2 is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is respectively connected to the third phase connection end, the input end of the light receiver of the photoelectric coupler N1 is connected to the head end of the resistor R3, the photoelectric coupler The output end of the light receiver of the photocoupler N1 is respectively connected to the head end of the resistor R5, the controlled end of the switch tube Q1, the head end of the resistor R10 and the controlled end of the switch tube Q3, the input end of the switch tube Q1 is respectively connected to the head end of the resistor R4, the head end of the resistor R6, the input end of the switch tube Q2 and the controlled end of the switch tube Q4, the switch tube Q4 and the second driving member are connected in series to form at least part of the second driving branch, the second driving branch is connected to the power supply, the input end of the light receiver of the photocoupler N2 is connected to the head end of the resistor R7, the output end of the light receiver of the photocoupler N2 is respectively connected to the head end of the resistor R9 and the controlled end of the switch tube Q2 The input end of the switch tube Q3 is respectively connected to the head end of the resistor R8, the head end of the resistor R11 and the controlled end of the switch tube Q5, the switch tube Q5 and the third driving member are connected in series to form at least part of a third driving branch, the third driving branch is connected to a power supply, the tail end of the resistor R3, the tail end of the resistor R4, the tail end of the resistor R7 and the tail end of the resistor R8 are all connected to the power supply, the tail end of the resistor R5, the output end of the switch tube Q1, the tail end of the resistor R6, the tail end of the resistor R9, the output end of the switch tube Q2, the tail end of the resistor R10, the output end of the switch tube Q2 and the tail end of the resistor R11 are all grounded.

[0016] A welding machine according to an embodiment of the second aspect of the present invention comprises the multi-voltage input control device disclosed in any one of the above embodiments.

[0017] The welding machine according to the embodiment of the present invention has at least the following beneficial effects:

[0018] The welding machine of the present invention applies the multi-voltage input control device disclosed in any of the above embodiments, can be compatible with more voltage levels, automatically adapt to the input of single-phase or three-phase AC power supply, and can also prevent power supply failure caused by user wiring errors. It is easy and reliable to use.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 It is a principle structure block diagram of one embodiment of the multi-voltage input control device of the present invention;

[0022] Figure 2 A circuit diagram of a phase-to-phase voltage detection module of one embodiment of a multi-voltage input control device of the present invention;

[0023] Figure 3 A circuit diagram of a phase loss detection module of one embodiment of a multi-voltage input control device of the present invention;

[0024] Figure 4 It is a circuit diagram of a connection terminal switching module, an inter-phase voltage switching module and a voltage transformation module of one embodiment of a multi-voltage input control device of the present invention.

[0025] Reference numerals:

[0026] Input terminal group 100; first phase connection terminal 110; second phase connection terminal 120; third phase connection terminal 130; phase loss detection module 200; first live detection unit 210; second live detection unit 220; second drive unit 230; phase-to-phase voltage detection module 300; rectifier unit 310; first rectifier bridge 311; second rectifier bridge 312; phase voltage identification unit 320; first drive unit 330; connection terminal switching module 400; first live terminal 410; second live terminal 420; second switching switch 430; second drive element 440; third switching switch 450; third drive element 460; phase-to-phase voltage switching module 500; first switching switch 510; first drive element 520; transformer module 600; primary winding 610; first transformer terminal 611; second transformer terminal 612; third transformer terminal 613; secondary winding 620. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] like Figures 1 to 4 As shown, according to a first aspect of an embodiment of the present invention, a multi-voltage input control device includes an input terminal group 100, a phase loss detection module 200, a phase-to-phase voltage detection module 300, a connection terminal switching module 400, a phase-to-phase voltage switching module 500 and a transformer module 600, wherein the input terminal group 100 includes multiple phase connection terminals, and the multiple phase connection terminals are used to be connected to at least two phases of an AC power supply, the phase loss detection module 200 is connected to the input terminal group 100, and the phase loss detection module 200 is used to detect energized phase information, wherein the energized phase information is used to characterize which phase connection terminals of the multiple phase connection terminals are energized, the phase-to-phase voltage detection module 300 is connected to the input terminal group 100, and the phase-to-phase voltage detection module 300 is used to detect the phase-to-phase voltage information between the energized phase connection terminals, and the connection terminal switching module 400 The module 400 has a first live end 410 and a second live end 420, the connection end switching module 400 is connected to each phase connection end, the connection end switching module 400 is connected to the phase loss detection module 200 to connect at least two live phase connection ends of each phase connection end to the first live end 410 and the second live end 420 respectively according to the live phase information, the transformer module 600 includes a primary winding 610 and a secondary winding 620 coupled to each other, the phase-to-phase voltage switching module 500 is respectively connected to the first live end 410, the second live end 420 and the primary winding 610, and the phase-to-phase voltage switching module 500 changes the number of winding turns of the first live end 410 and the second live end 420 connected to the primary winding 610 according to the phase-to-phase voltage information.

[0032] The input terminal group 100 may be a port for connecting to an AC power source, such as a three-pin socket, etc. The phase connection terminal may be a connection contact in the input terminal group 100. Taking single-phase and three-phase as examples, a single-phase AC power source may be connected to two phase connection terminals in the input terminal group 100, while other connection terminals in the input terminal group 100 are in an idle state, and a three-phase AC power source may be connected to three phase connection terminals in the input terminal group 100. As for which phase connection terminal the AC power source is connected to, it is necessary to use the phase loss detection module 200 to detect which phase connection terminals are energized to determine, and after the determination, control the connection terminal switching module 400 to connect the energized phase connection terminal to the In the rear circuit, the voltage level of the AC power supply needs to be detected by the phase-to-phase voltage detection module 300, and the voltage level is constrained within a suitable range by connecting the corresponding number of winding turns of the primary winding 610. It can be understood that the number of winding turns of the secondary winding 620 remains unchanged. For example, the power supply level required by the rear circuit is 110V. When the voltage of the AC power supply is higher, such as 380V, the number of winding turns of the primary winding 610 is reduced. After the coupling transformation of the transformer module 600, the secondary winding 620 can output an output voltage approximately around 110V. Of course, the specific output voltage will fluctuate within the range acceptable to the rear circuit.

[0033] In the multi-voltage input control device of the present invention, the user connects the input terminal group 100 to the AC power supply according to actual conditions, and multiple phase connection terminals are connected to multiple phases in the AC power supply. The phase loss detection module 200 detects which phase connection terminals among the multiple phase connection terminals are energized to form energized phase information. The connection terminal switching module 400 selects to connect the energized phase among the multiple phase connection terminals to the primary winding 610 of the transformer module 600 according to the energized phase information. In addition, the phase-to-phase voltage detection module 300 detects the phase-to-phase voltage information between the energized phase connection terminals. The phase-to-phase voltage switching module 500 changes the number of winding turns of the first energized terminal 410 and the second energized terminal 420 connected to the primary winding 610 according to the magnitude of the phase-to-phase voltage. The change in the number of winding turns of the primary winding 610 keeps the output voltage of the secondary winding 620 within a certain range to supply power to the rear circuit module. The present design is compatible with more voltage levels and automatically adapts to the input of single-phase or three-phase AC power supply. It can also prevent power supply failures caused by user wiring errors. It is convenient and reliable to use.

[0034] Specifically, there are three phase connection terminals, which are respectively a first phase connection terminal 110, a second phase connection terminal 120 and a third phase connection terminal 130. The input terminal group 100 is used to connect to a single-phase AC power supply or a three-phase AC power supply. The following is an explanation of how the multi-voltage input control device of the present design automatically adapts in three situations in which the user may connect the input terminal group 100 to an AC220V single-phase AC power supply, an AC220V three-phase AC power supply and an AC380V three-phase AC power supply in some application situations. According to actual conditions, designers can adjust component parameters on the circuit architecture of the present design, without being limited to these three AC power supplies.

[0035] In some embodiments of the present invention, Figure 2 , 4 As shown, the interphase voltage switching module 500 includes a first switch 510 and a first driving member 520, the primary winding 610 includes a first transformer end 611 and at least a second transformer end 612 and a third transformer end 613, wherein the number of winding turns between the first transformer end 611 and the second transformer end 612 is less than the number of winding turns between the first transformer end 611 and the third transformer end 613, the first live end 410 is connected to the first transformer end 611, the second live end 420 is connected to the first switch 510, and the interphase voltage detection The measuring module 300 is connected to the first driving member 520 to control the first driving member 520 to drive the first switching switch 510 to switch between at least a first connection state and a second connection state according to the phase-to-phase voltage information, wherein, in the first connection state, the first switching switch 510 is switched to be connected to the second transformer terminal 612 so that the second live terminal 420 and the second transformer terminal 612 are conductive, and in the second connection state, the first switching switch 510 is switched to be connected to the third transformer terminal 613 so that the second live terminal 420 and the third transformer terminal 613 are conductive.

[0036] Among them, the first driving member 520 can be a relay coil, a motor or an electric push rod, etc., which can drive the first switching switch 510 to move and connect with different contacts. For example, one end of the first switching switch 510 is connected to the second energized end 420, and the other end of the first switching switch 510 can move in the second transformer end 612 and the third transformer end 613 and connect with the second transformer end 612 or the third transformer end 613 according to the phase-to-phase voltage information. Specifically, according to the voltage level of the actual connected AC power supply, a fourth transformer end, a fifth transformer end, etc. can be added to the primary winding 610. The first switching switch 510 selectively connects to the appropriate transformer end according to the phase-to-phase voltage information, thereby achieving voltage regulation.

[0037] In some embodiments of the present invention, Figure 2 As shown, the phase-to-phase voltage detection module 300 includes a rectifier unit 310, a phase voltage identification unit 320 and a first drive unit 330. The input end of the rectifier unit 310 is respectively connected to each of the phase connection ends to process the AC phase-to-phase voltage into a DC phase-to-phase voltage signal. The input end of the phase voltage identification unit 320 is connected to the output end of the rectifier unit 310 to determine whether the phase voltage is greater than a voltage threshold according to the phase voltage signal. The phase voltage identification unit 320 forms a first trigger signal according to the judgment result. The controlled end of the first drive unit 330 is connected to the output end of the phase voltage identification unit 320. The first drive unit 330 is connected to the first drive member 520 to control the first drive member 520 to switch between at least a first connection state and a second connection state according to the first trigger signal.

[0038] The rectifier unit 310 rectifies the AC power supply to form a DC phase-to-phase voltage signal. The phase-to-phase voltage signal represents the magnitude of the output voltage of the rectifier unit 310. Taking the voltage levels of 220V and 380V as an example, a voltage threshold is set based on the voltage levels of 220V and 380V. The phase voltage identification unit 320 determines whether the phase-to-phase voltage is greater than the voltage threshold based on the phase-to-phase voltage signal. If it is greater, it proves that the phase-to-phase voltage is 380V. If it is less than, it proves that the phase-to-phase voltage is 220V, and forms a first trigger signal accordingly. The first drive unit 330 controls the first drive member 520 to switch between at least the first connection state and the second connection state according to the first trigger signal. For example, when the phase-to-phase voltage is 380V, the first switching switch 510 is controlled to switch to the second connection state.

[0039] In some embodiments of the present invention, Figure 1 As shown, the rectifier unit 310 includes a first rectifier bridge 311 and a second rectifier bridge 312, the first phase connection terminal 110 is connected to the first input terminal of the first rectifier bridge 311, the second phase connection terminal 120 is respectively connected to the second input terminal of the first rectifier bridge 311 and the first input terminal of the second rectifier bridge 312, the third phase connection terminal 130 is connected to the second input terminal of the second rectifier bridge 312, the output terminal of the first rectifier bridge 311 and the output terminal of the second rectifier bridge 312 are connected in parallel and connected to the input terminal of the phase voltage identification unit 320.

[0040] The first rectifier bridge 311 and the second rectifier bridge 312 can both be full-wave rectifier bridges or full-bridge rectifier bridges. Specifically, the first rectifier bridge 311 and the second rectifier bridge 312 are both full-bridge rectifier bridges composed of four diodes, thereby being able to rectify the AC phase-to-phase voltage of the first phase connection terminal 110 and the second phase connection terminal 120, the AC phase-to-phase voltage of the first phase connection terminal 110 and the third phase connection terminal 130, and the AC phase-to-phase voltage of the second phase connection terminal 120 and the third phase connection terminal 130.

[0041] In some embodiments of the present invention, the phase voltage identification unit 320 includes a voltage regulator tube Z5, a resistor R3 and a diode D3, the first driving unit 330 includes a photoelectric coupler N3, a semiconductor switch tube Q6, a resistor R13, a resistor R14, a resistor R15, a resistor R16 and a semiconductor switch tube Q7, the cathode of the voltage regulator tube Z5 is respectively connected to the positive output end of the first rectifier bridge 311 and the positive output end of the second rectifier bridge 312, the anode of the voltage regulator tube Z5 is connected to the head end of the resistor R3, the tail end of the resistor R3 is connected to the anode of the light emitter of the photoelectric coupler N3, the cathode of the light emitter of the photoelectric coupler N3 is connected to the anode of the diode D3, and the cathode of the diode D3 is respectively connected to the cathode output end of the first rectifier bridge 311. The output end is connected to the negative output end of the second rectifier bridge 312, the input end of the light receiver of the photoelectric coupler N3 is connected to the head end of the resistor R13, the output end of the light receiver of the photoelectric coupler N3 is respectively connected to the head end of the resistor R5 and the controlled end of the switch tube Q6, the input end of the switch tube Q6 is respectively connected to the head end of the resistor R14, the head end of the resistor R16 and the controlled end of the switch tube Q7, the tail end of the resistor R13 and the tail end of the resistor R14 are both connected to the power supply, the tail end of the resistor R15, the tail end of the resistor R16 and the output end of the switch tube Q6 are all grounded, the switch tube Q7 and the first driving member 520 are connected in series to form at least part of the first driving branch, and the first driving branch is connected to the power supply.

[0042] The phase voltage identification unit 320 uses the Zener tube Z5 to set the voltage threshold for judging the phase-to-phase voltage. When the phase-to-phase voltage is less than the breakdown voltage of the Zener tube Z5, the Zener tube Z5 is not turned on, the light emitter of the photocoupler N3 is not lit, the light receiver of the photocoupler N3 is not turned on, the switch tube Q6 is not turned on, the switch tube Q7 is turned on, and the first driving component 520 is energized to drive the first switching switch 510 to the first connection state. When the phase-to-phase voltage is greater than the breakdown voltage of the Zener tube Z5, the Zener tube Z5 is turned on, the light emitter of the photocoupler N3 is lit, the light receiver of the photocoupler N3 is turned on, the switch tube Q6 is turned on, the switch tube Q7 is turned off, and the first driving component 520 is energized to drive the first switching switch 510 to the second connection state.

[0043] Specifically, the switch tube Q6 and the switch tube Q7 can both be triodes, MOS tubes or thyristors.

[0044] In some embodiments of the present invention, Figure 4 As shown, the connection end switching module 400 includes a second switching switch 430, a second driving member 440, a third switching switch 450 and a third driving member 460, the second switching switch 430 is connected to the second live end 420, the third switching switch 450 is connected to the first live end 410, the phase loss detection module 200 is respectively connected to the second driving member 440 and the third driving member 460, the phase loss detection module 200 controls the second driving member 440 according to the live phase information to drive the second switching switch 430 to switch between at least the third connection state and the fourth connection state, wherein in the third connection state, the second switching switch 430 is connected to the second phase connection end 120 so that the second phase connection end 120 is connected to the second live end 420 is connected, in the fourth connection state, the second switching switch 430 is connected to the first phase connection end 110 so that the first phase connection end 110 is connected to the second energized end 420, and the phase loss detection module 200 controls the third driving member 460 according to the energized phase information to drive the third switching switch 450 to switch between at least the fifth connection state and the sixth connection state, wherein, in the fifth connection state, the third switching switch 450 is connected to the first phase connection end 110 so that the first phase connection end 110 is connected to the first energized end 410, and in the sixth connection state, the third switching switch 450 is connected to the third phase connection end 130 so that the third phase connection end 130 is connected to the first energized end 410.

[0045] The phase loss detection module 200 is respectively connected to the first phase connection terminal 110, the second phase connection terminal 120 and the third phase connection terminal 130. Taking the single-phase or three-phase AC power supply connection as an example, for example, when only a single-phase AC power supply is connected and connected to the first phase connection terminal 110 and the second phase connection terminal 120, the phase loss detection module 200 controls the second drive component 440 to drive the second switching switch 430 to switch to the third connection state, and controls the third drive component 460 to drive the third switching switch 450 to switch to the fifth connection state; for example, when only a single-phase AC power supply is connected and connected to the second phase connection terminal 120 and the third phase connection terminal 130, the phase loss detection module 200 controls the second drive component 440 to drive the second switching switch 430 to switch to the third connection state, and controls the third drive component 460 to drive the third switching switch 450 to switch to the sixth connection state.

[0046] In some embodiments of the present invention, Figure 3 As shown, the phase loss detection module 200 includes a first charged detection unit 210, a second charged detection unit 220 and a second driving unit 230, the first charged detection unit 210 is respectively connected to the first phase connection end 110 and the second phase connection end 120 to form a second trigger signal according to the result of whether the first phase connection end 110 and the second phase connection end 120 are charged, and the second charged detection unit 220 is respectively connected to the second phase connection end 120 and the third phase connection end 130 to form a second trigger signal according to the result of whether the second phase connection end 120 and the third phase connection end 130 are charged. The result of determining whether the second charging detection unit 210 is charged or not forms a third trigger signal, the input end of the second driving unit 230 is respectively connected to the output end of the first charging detection unit 210 and the output end of the second charging detection unit 220, the output end of the second driving unit 230 is respectively connected to the second driving member 440 and the third driving member 460, the second driving unit 230 controls the second driving member 440 to switch between at least the third connection state and the fourth connection state and controls the third driving member 460 to switch between at least the fifth connection state and the sixth connection state according to the second trigger signal and the third trigger signal.

[0047] The first charged detection unit 210 detects whether there is power between the first phase connection terminal 110 and the second phase connection terminal 120, and the second charged detection unit 220 detects whether there is power between the second phase connection terminal 120 and the third phase connection terminal 130. The second driving unit 230 then controls the second driving member 440 to switch between the third connection state and the fourth connection state and controls the third driving member 460 to switch between the fifth connection state and the sixth connection state according to the second trigger signal and the third trigger signal.

[0048] Specifically, the first charged detection unit 210 includes a voltage regulator tube Z1, a resistor R1 and a diode D1, the second charged detection unit 220 includes a voltage regulator tube Z3, a resistor R2 and a diode D2, the second driving unit 230 includes a photoelectric coupler N1, a photoelectric coupler N2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a semiconductor switch tube Q1, a semiconductor switch tube Q4, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a semiconductor switch tube Q2, a semiconductor switch tube Q3 and a semiconductor switch tube Q5; the first phase connection end 110 is connected to the negative electrode of the voltage regulator tube Z1, and the positive electrode of the voltage regulator tube Z1 is connected to the first end of the resistor R1. The tail end of the resistor R1 is connected to the positive electrode of the light emitter of the photoelectric coupler N1, the negative electrode of the light emitter of the photoelectric coupler N1 is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is respectively connected to the second phase connection end 120 and the negative electrode of the voltage regulator tube Z3, the positive electrode of the voltage regulator tube Z3 is connected to the head end of the resistor R2, the tail end of the resistor R2 is connected to the positive electrode of the light emitter of the photoelectric coupler N2, the negative electrode of the light emitter of the photoelectric coupler N2 is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is respectively connected to the third phase connection end 130, the input end of the light receiver of the photoelectric coupler N1 is connected to the head end of the resistor R3, the photoelectric The output end of the light receiver of the coupler N1 is respectively connected to the head end of the resistor R5, the controlled end of the switch tube Q1, the head end of the resistor R10 and the controlled end of the switch tube Q3, the input end of the switch tube Q1 is respectively connected to the head end of the resistor R4, the head end of the resistor R6, the input end of the switch tube Q2 and the controlled end of the switch tube Q4, the switch tube Q4 and the second driving member 440 are connected in series to form at least part of the second driving branch, the second driving branch is connected to the power supply, the input end of the light receiver of the photoelectric coupler N2 is connected to the head end of the resistor R7, the output end of the light receiver of the photoelectric coupler N2 is respectively connected to the head end of the resistor R9 and the controlled end of the switch tube Q2 The input end of the switch tube Q3 is connected to the head end of the resistor R8, the head end of the resistor R11 and the controlled end of the switch tube Q5 respectively; the switch tube Q5 and the third driving member 460 are connected in series to form at least part of a third driving branch; the third driving branch is connected to a power supply; the tail end of the resistor R3, the tail end of the resistor R4, the tail end of the resistor R7 and the tail end of the resistor R8 are all connected to the power supply; the tail end of the resistor R5, the output end of the switch tube Q1, the tail end of the resistor R6, the tail end of the resistor R9, the output end of the switch tube Q2, the tail end of the resistor R10, the output end of the switch tube Q2 and the tail end of the resistor R11 are all grounded.

[0049] When a single-phase AC power supply is connected and there is power between the first phase connection terminal 110 and the second phase connection terminal 120, the Zener diode Z1 is broken down and turned on, the light emitter of the photocoupler N1 is lit, the light receiver of the photocoupler N1 is turned on, the switch tube Q1 and the switch tube Q3 are both turned on, regardless of whether there is power between the second phase connection terminal 120 and the third phase connection terminal 130 at this time, the switch tube Q4 is turned off, the switch tube Q5 is also hung up, the second switching switch 430 is switched to the third connection state, and the third switching switch 450 is switched to the fifth connection state.

[0050] When a three-phase AC power source is connected, the first phase connection terminal 110, the second phase connection terminal 120, and the third phase connection terminal 130 are all energized. Similarly, the second switch 430 is switched to the third connection state, and the third switch 450 is switched to the fifth connection state.

[0051] When a single-phase AC power supply is connected, and there is power between the second phase connection terminal 120 and the third phase connection terminal 130, and there is no power between the first phase connection terminal 110 and the second phase connection terminal 120, the Zener tube Z1 is not broken down, the light emitter of the photocoupler N1 is not lit, the light receiver of the photocoupler N1 is turned off, the switch tube Q1 and the switch tube Q3 are both turned off, the switch tube Q5 is turned on, the third switching switch 450 is switched to the sixth connection state, and the Zener tube Z3 is broken down and turned on, the light emitter of the photocoupler N2 is lit, the light receiver of the photocoupler N1 is turned on, and the switch tube Q2 is turned on, therefore, the switch tube Q4 is turned off, and the second switching switch 430 is switched to the third connection state.

[0052] A welding machine according to an embodiment of the second aspect of the present invention comprises the multi-voltage input control device disclosed in any one of the above embodiments.

[0053] The welding machine of the present invention applies the multi-voltage input control device disclosed in any of the above embodiments, can be compatible with more voltage levels, automatically adapt to the input of single-phase or three-phase AC power supply, and can also prevent power supply failure caused by user wiring errors. It is easy and reliable to use.

[0054] 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.

[0055] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A multi-voltage input control device, characterized in that: include: An input terminal group, comprising a plurality of phase connection terminals, wherein the plurality of phase connection terminals are used to be connected to at least two phases of an AC power supply; A phase loss detection module is connected to the input terminal group, and is used to detect energized phase information, wherein the energized phase information is used to indicate which phase connection terminals among the multiple phase connection terminals are energized; A phase-to-phase voltage detection module, connected to the input terminal group, and used for detecting phase-to-phase voltage information between the energized phase connection terminals; A connection end switching module, wherein the connection end switching module has a first live end and a second live end, the connection end switching module is connected to each phase connection end, and the connection end switching module is connected to the phase loss detection module to connect at least two live phase connection ends of each phase connection end to the first live end and the second live end respectively according to the live phase information; A phase-to-phase voltage switching module and a transformer module, wherein the transformer module includes a primary winding and a secondary winding coupled to each other, the phase-to-phase voltage switching module is respectively connected to the first live end, the second live end and the primary winding, and the phase-to-phase voltage switching module changes the number of winding turns of the first live end and the second live end connected to the primary winding according to the phase-to-phase voltage information.

2. A multi-voltage input control device according to claim 1, characterized in that: There are three phase connection terminals, which are respectively a first phase connection terminal, a second phase connection terminal and a third phase connection terminal. The input terminal group is used to connect to a single-phase AC power supply or a three-phase AC power supply.

3. A multi-voltage input control device according to claim 2, characterized in that: The phase-to-phase voltage switching module includes a first switching switch and a first driving member, the primary winding includes a first transformer end and at least a second transformer end and a third transformer end, wherein the number of winding turns between the first transformer end and the second transformer end is less than the number of winding turns between the first transformer end and the third transformer end, the first live end is connected to the first transformer end, and the second live end is connected to the first switching switch, and the phase-to-phase voltage detection module is connected to the first driving member to control the first driving member to drive the first switching switch to switch between at least a first connection state and a second connection state according to the phase-to-phase voltage information, wherein, in the first connection state, the first switching switch is switched to connect to the second transformer end so that the second live end and the second transformer end are conductive, and in the second connection state, the first switching switch is switched to connect to the third transformer end so that the second live end and the third transformer end are conductive.

4. The multi-voltage input control device according to claim 3, characterized in that: The phase-to-phase voltage detection module includes a rectifier unit, a phase voltage identification unit and a first drive unit. The input end of the rectifier unit is respectively connected to each of the phase connection ends to process the AC phase-to-phase voltage into a DC phase-to-phase voltage signal. The input end of the phase voltage identification unit is connected to the output end of the rectifier unit to determine whether the phase voltage is greater than a voltage threshold according to the phase voltage signal. The phase voltage identification unit forms a first trigger signal according to the judgment result. The controlled end of the first drive unit is connected to the output end of the phase voltage identification unit. The first drive unit is connected to the first drive element to control the first drive element to switch between at least a first connection state and a second connection state according to the first trigger signal.

5. The multi-voltage input control device according to claim 4, characterized in that: The rectifier unit includes a first rectifier bridge and a second rectifier bridge, the first phase connection end is connected to the first input end of the first rectifier bridge, the second phase connection end is respectively connected to the second input end of the first rectifier bridge and the first input end of the second rectifier bridge, the third phase connection end is connected to the second input end of the second rectifier bridge, the output end of the first rectifier bridge and the output end of the second rectifier bridge are connected in parallel and connected to the input end of the phase voltage identification unit.

6. The multi-voltage input control device according to claim 5, characterized in that: The phase voltage identification unit includes a voltage regulator tube Z5, a resistor R3 and a diode D3. The first driving unit includes a photoelectric coupler N3, a semiconductor switch tube Q6, a resistor R13, a resistor R14, a resistor R15, a resistor R16 and a semiconductor switch tube Q7. The cathode of the voltage regulator tube Z5 is respectively connected to the positive output end of the first rectifier bridge and the positive output end of the second rectifier bridge. The anode of the voltage regulator tube Z5 is connected to the head end of the resistor R3. The tail end of the resistor R3 is connected to the anode of the light emitter of the photoelectric coupler N3. The cathode of the light emitter of the photoelectric coupler N3 is connected to the anode of the diode D3. The cathode of the diode D3 is respectively connected to the cathode output end of the first rectifier bridge and the cathode output end of the second rectifier bridge. The negative output end of the photoelectric coupler N3 is connected, the input end of the photoreceiver of the photoelectric coupler N3 is connected to the head end of the resistor R13, the output end of the photoreceiver of the photoelectric coupler N3 is respectively connected to the head end of the resistor R5 and the controlled end of the switch tube Q6, the input end of the switch tube Q6 is respectively connected to the head end of the resistor R14, the head end of the resistor R16 and the controlled end of the switch tube Q7, the tail end of the resistor R13 and the tail end of the resistor R14 are both connected to the power supply, the tail end of the resistor R15, the tail end of the resistor R16 and the output end of the switch tube Q6 are all grounded, the switch tube Q7 and the first driving member are connected in series to form at least part of the first driving branch, and the first driving branch is connected to the power supply.

7. The multi-voltage input control device according to claim 2, characterized in that: The connection end switching module includes a second switching switch, a second driving member, a third switching switch and a third driving member, the second switching switch is connected to the second live end, the third switching switch is connected to the first live end, the phase loss detection module is connected to the second driving member and the third driving member respectively, the phase loss detection module controls the second driving member to drive the second switching switch to switch between at least a third connection state and a fourth connection state according to the live phase information, wherein in the third connection state, the second switching switch is connected to the second phase connection end so that the second phase connection end is connected to the second live end, and in the fourth connection state, the second switching switch is connected to the first phase connection end so that the first phase connection end is connected to the second live end, and the phase loss detection module controls the third driving member to drive the third switching switch to switch between at least a fifth connection state and a sixth connection state according to the live phase information, wherein in the fifth connection state, the third switching switch is connected to the first phase connection end so that the first phase connection end is connected to the first live end, and in the sixth connection state, the third switching switch is connected to the third phase connection end so that the third phase connection end is connected to the first live end.

8. The multi-voltage input control device according to claim 7, characterized in that: The phase loss detection module includes a first charged detection unit, a second charged detection unit and a second driving unit. The first charged detection unit is respectively connected to the first phase connection end and the second phase connection end to form a second trigger signal according to whether the first phase connection end and the second phase connection end are charged. The second charged detection unit is respectively connected to the second phase connection end and the third phase connection end to form a third trigger signal according to whether the second phase connection end and the third phase connection end are charged. The input end of the second driving unit is respectively connected to the output end of the first charged detection unit and the output end of the second charged detection unit, and the output end of the second driving unit is respectively connected to the second driving member and the third driving member. The second driving unit controls the second driving member to switch between at least the third connection state and the fourth connection state according to the second trigger signal and the third trigger signal, and controls the third driving member to switch between at least the fifth connection state and the sixth connection state.

9. The multi-voltage input control device according to claim 8, characterized in that: The first charged detection unit includes a voltage regulator tube Z1, a resistor R1 and a diode D1, the second charged detection unit includes a voltage regulator tube Z3, a resistor R2 and a diode D2, the second driving unit includes a photoelectric coupler N1, a photoelectric coupler N2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a semiconductor switch tube Q1, a semiconductor switch tube Q4, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a semiconductor switch tube Q2, a semiconductor switch tube Q3 and a semiconductor switch tube Q5; the first phase connection end is connected to the negative electrode of the voltage regulator tube Z1, the positive electrode of the voltage regulator tube Z1 is connected to the head end of the resistor R1, and the positive electrode of the resistor R1 is connected to the positive electrode of the resistor R1. The tail end is connected to the positive electrode of the light emitter of the photoelectric coupler N1, the negative electrode of the light emitter of the photoelectric coupler N1 is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is respectively connected to the second phase connection end and the negative electrode of the voltage regulator tube Z3, the positive electrode of the voltage regulator tube Z3 is connected to the head end of the resistor R2, the tail end of the resistor R2 is connected to the positive electrode of the light emitter of the photoelectric coupler N2, the negative electrode of the light emitter of the photoelectric coupler N2 is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is respectively connected to the third phase connection end, the input end of the light receiver of the photoelectric coupler N1 is connected to the head end of the resistor R3, the light receiver of the photoelectric coupler N1 The output end of the device is respectively connected to the head end of the resistor R5, the controlled end of the switch tube Q1, the head end of the resistor R10 and the controlled end of the switch tube Q3, the input end of the switch tube Q1 is respectively connected to the head end of the resistor R4, the head end of the resistor R6, the input end of the switch tube Q2 and the controlled end of the switch tube Q4, the switch tube Q4 and the second driver are connected in series to form at least part of the second drive branch, the second drive branch is connected to the power supply, the input end of the light receiver of the photoelectric coupler N2 is connected to the head end of the resistor R7, the output end of the light receiver of the photoelectric coupler N2 is respectively connected to the head end of the resistor R9 and the controlled end of the switch tube Q2, The input end of the switch tube Q3 is respectively connected to the head end of the resistor R8, the head end of the resistor R11 and the controlled end of the switch tube Q5. The switch tube Q5 and the third driving member are connected in series to form at least part of a third driving branch. The third driving branch is connected to a power supply. The tail end of the resistor R3, the tail end of the resistor R4, the tail end of the resistor R7 and the tail end of the resistor R8 are all connected to the power supply. The tail end of the resistor R5, the output end of the switch tube Q1, the tail end of the resistor R6, the tail end of the resistor R9, the output end of the switch tube Q2, the tail end of the resistor R10, the output end of the switch tube Q2 and the tail end of the resistor R11 are all grounded.

10. A welding machine, characterized in that: It comprises the multi-voltage input control device as described in any one of claims 1 to 9.

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