Multi-voltage input control device and welding machine

Abstract

The utility model 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 connecting 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 utility model relates to electronic equipment technical field, especially a kind of multi-voltage input control device and welding machine. BACKGROUND

[0002] Welding machine is widely used in metal processing industry, due to the different voltage of power supply in each region, each country power grid, each regional civil electricity and industrial electricity also have division, for example, there is single-phase 220V, three-phase 110V, three-phase 220V, three-phase 380V etc. power supply, at present, the power drive device in welding machine can only modulate single input voltage, and the input voltage range is limited.

[0003] And in actual use process, user needs to connect the power supply into the input module of power drive device, in the connection process, there is phase misconnection or single-phase power supply cannot be adapted to three-phase input module, inconvenient to use, there is greater constraint limitation. UTILITY MODEL CONTENT

[0004] The utility model at least solves one of the technical problems in the prior art. To this end, the utility model provides a multi-voltage input control device and welding machine, which can be compatible with more voltage grades, automatically regulate voltage and be convenient and reliable to use.

[0005] According to the first aspect embodiment of the utility model, a kind of multi-voltage input control device, comprising: input terminal group, including multiple phase connection ends, multiple phase connection ends are used to connect with at least two phases in alternating current power supply;Phase detection module is connected with the input terminal group, and the phase detection module is used to detect live phase information, wherein, live phase information is used to show which phase connection end in multiple phase connection ends is live;Interphase voltage detection module is connected with the input terminal group, and the interphase voltage detection module is used to detect the interphase voltage information between live phase connection end;Connection end switching module, the connection end switching module has first live end and second live end, the connection end switching module is connected with each phase connection end, the connection end switching module is connected with the phase detection module to according to the live phase information at least two live phase connection ends in each phase connection end is respectively connected with first live end and second live end corresponding;Interphase voltage switching module and voltage transformation module, the voltage transformation module includes mutually coupled primary winding and secondary winding, the interphase voltage switching module is connected with the first live end, the second live end and the primary winding respectively, and the interphase voltage switching module changes the winding turn number of primary winding that the first live end and the second live end access according to the interphase voltage information.

[0006] According to the utility model embodiment, a kind of multi-voltage input control device has at least the following beneficial effects:

[0007] The utility model discloses a multi -voltage input control device, and user according to actual situation will input end group access AC power supply, and multiple phase connection end is connected with the multi -phase in AC power supply, and the lack phase detection module detects which phase connection end in multiple phase connection end is electrified and forms electrified phase information, and the connection end switching module selects the electrified phase in multiple phase connection end and access to the primary winding of the voltage transformation module according to electrified phase information, in addition, the interphase voltage detection module detects the interphase voltage information between electrified phase connection end, and the interphase voltage switching module changes the winding turn number of primary winding that first electrified end and second electrified end access according to the size of interphase voltage, and the winding turn number of primary winding changes, makes the output voltage of secondary winding keep in certain range, and supplies power for the circuit module behind, and the design can be compatible with more voltage grade, and automatically adapt to the input of single -phase or three -phase AC power supply, can also prevent user wiring error and lead to power failure, convenient and reliable to use.

[0008] According to some embodiments of the utility model, the phase connection end has three, three phase connection end is first phase connection end, second phase connection end and third phase connection end respectively, and the input end group is used to be connected with single -phase AC power supply or three -phase AC power supply.

[0009] According to some embodiments of the utility model, the interphase voltage switching module includes first switch and first drive piece, and the primary winding includes first voltage transformation end and at least including second voltage transformation end and third voltage transformation end, wherein the winding turn number between first voltage transformation end and second voltage transformation end is less than the winding turn number between first voltage transformation end and third voltage transformation end, first electrified end is connected with first voltage transformation end, second electrified end is connected with first switch, and the interphase voltage detection module is connected with first drive piece to control first drive piece to drive first switch to switch at least between first connection state and second connection state according to interphase voltage information, wherein in first connection state, first switch switches to be connected with second voltage transformation end to make second electrified end and second voltage transformation end conductive, and in second connection state, first switch switches to be connected with third voltage transformation end to make second electrified end and third voltage transformation end conductive.

[0010] According to some embodiments of the utility model, the phase-to-phase voltage detection module includes rectifying unit, phase voltage identification unit and first drive unit, the input of rectifying unit is connected with each phase connection end respectively to handle the phase-to-phase voltage of alternating current into the phase-to-phase voltage signal of direct current, the input of phase voltage identification unit is connected with the output of rectifying unit to judge whether the phase-to-phase voltage is greater than voltage threshold according to phase-to-phase voltage signal, phase voltage identification unit forms first trigger signal according to the result of judgment, the controlled end of first drive unit is connected with the output of phase voltage identification unit, first drive unit is connected with first drive piece to control first drive piece to switch at least between first connection state and second connection state according to first trigger signal.

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

[0012] According to some embodiments of the utility model, the phase voltage identification unit includes voltage stabilizing tube Z5, resistance R3 and diode D3, the first drive unit includes photoelectric coupler N3, semiconductor switch tube Q6, resistance R13, resistance R14, resistance R15, resistance R16 and semiconductor switch tube Q7, the negative pole of voltage stabilizing tube Z5 is connected with the positive output of first rectifier bridge and the positive output of second rectifier bridge respectively, the positive pole of voltage stabilizing tube Z5 is connected with the first end of resistance R3, the tail end of resistance R3 is connected with the positive pole of the light emitter of photoelectric coupler N3, the negative pole of the light emitter of photoelectric coupler N3 is connected with the positive pole of diode D3, the negative pole of diode D3 is connected with the negative output of first rectifier bridge and the negative output of second rectifier bridge respectively, the input of the light receiver of photoelectric coupler N3 is connected with the first end of resistance R13, the output of the light receiver of photoelectric coupler N3 is connected with the first end of resistance R5 and the controlled end of switch tube Q6 respectively, the input of switch tube Q6 is connected with the first end of resistance R14, the first end of resistance R16 and the controlled end of switch tube Q7 respectively, the tail end of resistance R13 and the tail end of resistance R14 are connected with power supply, the tail end of resistance R15, the tail end of resistance R16 and the output of switch tube Q6 are grounded, switch tube Q7 and first drive piece are connected in series to constitute at least part of first drive branch, and the first drive branch is connected with power supply.

[0013] According to some embodiments of the present application, the connection end switching module comprises a second switching switch, a second driving member, a third switching switch and a third driving member, the second switching switch is connected with the second live end, the third switching switch is connected with the first live end, the open-phase detection module is connected with the second driving member and the third driving member respectively, the open-phase detection module controls the second driving member to drive the second switching switch to switch between at least the third connection state and the fourth connection state according to the live phase information, wherein in the third connection state, the second switching switch is connected with the second phase connection end to make the second phase connection end connected with the second live end, in the fourth connection state, the second switching switch is connected with the first phase connection end to make the first phase connection end connected with the second live end, the open-phase detection module controls the third driving member to drive the third switching switch to switch between at least the fifth connection state and the sixth connection state according to the live phase information, wherein in the fifth connection state, the third switching switch is connected with the first phase connection end to make the first phase connection end connected with the first live end, in the sixth connection state, the third switching switch is connected with the third phase connection end to make the third phase connection end connected with the first live end.

[0014] According to some embodiments of the present application, the open-phase detection module comprises a first live detection unit, a second live detection unit and a second driving unit, the first live detection unit is connected with the first phase connection end and the second phase connection end respectively to form a second trigger signal according to whether the first phase connection end and the second phase connection end are live, the second live detection unit is connected with the second phase connection end and the third phase connection end respectively to form a third trigger signal according to whether the second phase connection end and the third phase connection end are live, the input end of the second driving unit is connected with the output end of the first live detection unit and the output end of the second live detection unit respectively, the output end of the second driving unit is connected with the second driving member and the third driving member respectively, the second driving unit controls the second driving member to switch between at least the third connection state and the fourth connection state and controls the third driving member 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.

[0015] According to some embodiments of the utility model, first electrified detection unit includes stabilivolt Z1, resistance R1 and diode D1, second electrified detection unit includes stabilivolt Z3, resistance R2 and diode D2, second drive unit includes photoelectric coupler N1, photoelectric coupler N2, resistance R3, resistance R4, resistance R5, resistance R6, semiconductor switch tube Q1, semiconductor switch tube Q4, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, semiconductor switch tube Q2, semiconductor switch tube Q3 and semiconductor switch tube Q5, first phase connection end is connected with stabilivolt Z1's negative pole, stabilivolt Z1's positive pole is connected with resistance R1's first end, resistance R1's tail end is connected with photoelectric coupler N1's luminous ware's positive pole, photoelectric coupler N1's luminous ware's negative pole is connected with diode D1's positive pole, diode D1's negative pole is connected with second phase connection end and stabilivolt Z3's negative pole respectively, stabilivolt Z3's positive pole is connected with resistance R2's first end, resistance R2's tail end is connected with photoelectric coupler N2's luminous ware's positive pole, photoelectric coupler N2's luminous ware's negative pole is connected with diode D2's positive pole, diode D2's negative pole is connected with third phase connection end respectively, photoelectric coupler N1's light receiver's input end is connected with resistance R3's first end, photoelectric coupler N1's light receiver's output end is connected with resistance R5's first end, switch tube Q1's controlled end, resistance R10's first end and switch tube Q3's controlled end respectively, switch tube Q1's input end is connected with resistance R4's first end, resistance R6's first end, switch tube Q2's input end and switch tube Q4's controlled end respectively, switch tube Q4 and second drive piece are connected in series to constitute at least partial second drive branch, second drive branch is connected with power supply, photoelectric coupler N2's light receiver's input end is connected with resistance R7's first end, photoelectric coupler N2's light receiver's output end is connected with resistance R9's first end and switch tube Q2's controlled end respectively, switch tube Q3's input end is connected with resistance R8's first end, resistance R11's first end and switch tube Q5's controlled end respectively, switch tube Q5 and third drive piece are connected in series to constitute at least partial third drive branch, third drive branch is connected with power supply, resistance R3's tail end, resistance R4's tail end, resistance R7's tail end and resistance R8's tail end are all connected with power supply, resistance R5's tail end, switch tube Q1's output end, resistance R6's tail end, resistance R9's tail end, switch tube Q2's output end, resistance R10's tail end, switch tube Q2's output end and resistance R11's tail end are all grounded.

[0016] The welding machine according to the second aspect of the present application 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 application has at least the following beneficial effects:

[0018] The welding machine of the present application applies the multi-voltage input control device disclosed in any one of the above embodiments, can be compatible with more voltage grades, automatically adapt to the input of single-phase or three-phase alternating current power supply, and can also prevent power supply failure caused by user wiring error, and is convenient and reliable to use.

[0019] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the following drawings of which:

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

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

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

[0024] Figure 4 It is a circuit schematic diagram of the connection end switching module, the phase-to-phase voltage switching module and the voltage conversion module of one embodiment of the multi-voltage input control device of the present application.

[0025] REFERENCE NUMERALS:

[0026] Input terminal group 100; first phase connection terminal 110; second phase connection terminal 120; third phase connection terminal 130; open-phase detection module 200; first live detection unit 210; second live detection unit 220; second drive unit 230; inter-phase voltage detection module 300; rectification unit 310; first rectification bridge 311; second rectification 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 member 440; third switching switch 450; third drive member 460; inter-phase voltage switching module 500; first switching switch 510; first drive member 520; voltage transformation module 600; primary winding 610; first voltage transformation terminal 611; second voltage transformation terminal 612; third voltage transformation terminal 613; secondary winding 620. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0028] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0029] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only used for distinguishing the technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0030] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected; can be mechanical connection, also can be electrical connection; can be direct connection, also can through intermediate medium indirectly connect, can be two element internal communication. For ordinary skilled in the art, can understand the specific meaning of the above terms in the utility model according to specific circumstances.

[0031] As Figures 1 to 4 shown, according to the first aspect embodiment of the utility model a kind of multi-voltage input control device, including input terminal group 100, phase detection module 200, interphase voltage detection module 300, connection end switching module 400, interphase voltage switching module 500 and transformation module 600, input terminal group 100 includes multiple phase connection ends, multiple phase connection ends are used to connect with at least two phases in alternating current power supply, phase detection module 200 is connected with the input terminal group 100, the phase detection module 200 is used to detect live phase information, wherein, live phase information is used to show which phase connection end in multiple phase connection ends is live, interphase voltage detection module 300 is connected with the input terminal group 100, the interphase voltage detection module 300 is used to detect the interphase voltage information between live phase connection end, the connection end switching module 400 has first live end 410 and second live end 420, the connection end switching module 400 is connected with each phase connection end, the connection end switching module 400 is connected with the phase detection module 200 to according to the live phase information at least two live phase connection ends in each phase connection end is respectively corresponding with first live end 410 and second live end 420 connection, the transformation module 600 includes mutually coupled primary winding 610 and secondary winding 620, the interphase voltage switching module 500 is connected with first live end 410, second live end 420 and primary winding 610 respectively, the interphase voltage switching module 500 changes the winding turn number of primary winding 610 that first live end 410 and second live end 420 are accessed according to the interphase voltage information.

[0032] The input end group 100 can be a port member for accessing an alternating current power supply, for example, a three-pin socket, etc., and the phase connection end can be a connection contact in the input end group 100. Taking single-phase and three-phase as examples, a single-phase alternating current power supply can be connected to two phase connection ends in the input end group 100, and the other connection ends in the input end group 100 are in an idle state. A three-phase alternating current power supply can be connected to three phase connection ends in the input end group 100. As to which phase connection end the alternating current power supply is connected to, it needs to be detected by the phase absence detection module 200 to determine which phase connection end is live, and after the determination, the connection end switching module 400 is controlled to connect the live phase connection end to the rear circuit. As to what the voltage level of the alternating current power supply is, it needs to be detected by the inter-phase voltage detection module 300, and the voltage level is constrained in a suitable range by connecting the corresponding number of turns of the primary winding 610. It can be understood that the number of turns of the secondary winding 620 is unchanged. For example, the power supply level required by the rear circuit is 110V. When the voltage of the alternating current power supply is higher, for example, 380V, the number of turns of the primary winding 610 is reduced. After the coupling and transformation of the transformer module 600, the secondary winding 620 can output an output voltage of about 110V. Of course, the specific output voltage will exist within the acceptable range of the rear circuit.

[0033] The multi-voltage input control device can be connected to an alternating current power supply according to the actual situation by a user. A plurality of phase connection ends are connected to a plurality of phases in the alternating current power supply. The phase absence detection module 200 detects which phase connection ends in the plurality of phase connection ends are live to form live phase information. The connection end switching module 400 selects the live phase in the plurality of phase connection ends to be connected to the primary winding 610 of the transformer module 600 according to the live phase information. In addition, the inter-phase voltage detection module 300 detects the inter-phase voltage information between the live phase connection ends. The inter-phase voltage switching module 500 changes the number of turns of the primary winding 610 connected to the first live end 410 and the second live end 420 according to the size of the inter-phase voltage. The change in the number of turns of the primary winding 610 makes the output voltage of the secondary winding 620 remain within a certain range to supply power to the rear circuit module. The design can be compatible with more voltage levels and automatically adapt to the input of single-phase or three-phase alternating current power supply. At the same time, it can also prevent the user from making wiring errors and causing power supply failure. It is convenient and reliable to use.

[0034] Specifically, the phase connection ends are three, and the three phase connection ends are a first phase connection end 110, a second phase connection end 120, and a third phase connection end 130; the input end group 100 is used for being connected with a single-phase alternating current power supply or a three-phase alternating current power supply; in the following, in the case of some application, the user may connect the input end group 100 to three kinds of alternating current power supplies, i.e., an AC220V single-phase alternating current power supply, an AC220V three-phase alternating current power supply, and an AC380V three-phase alternating current power supply; how the multi-voltage input control device automatically adapts is described; and according to the actual situation, the designer can adjust the element parameters on the basis of the circuit architecture of the design, and is not limited to the three kinds of alternating current power supplies.

[0035] In some embodiments of the utility model, as shown in Figure 2 、 4 As shown in the figure, the inter-phase voltage switching module 500 includes a first switching switch 510 and a first driving member 520; the primary winding 610 includes a first voltage transformation end 611 and at least a second voltage transformation end 612 and a third voltage transformation end 613; the number of turns of the winding between the first voltage transformation end 611 and the second voltage transformation end 612 is less than the number of turns of the winding between the first voltage transformation end 611 and the third voltage transformation end 613; the first live end 410 is connected with the first voltage transformation end 611; the second live end 420 is connected with the first switching switch 510; the inter-phase voltage detection module 300 is connected with 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 inter-phase voltage information; in the first connection state, the first switching switch 510 is switched to be connected with the second voltage transformation end 612 to make the second live end 420 and the second voltage transformation end 612 conductive; in the second connection state, the first switching switch 510 is switched to be connected with the third voltage transformation end 613 to make the second live end 420 and the third voltage transformation end 613 conductive.

[0036] The first driving member 520 can be a relay coil, a motor, or an electric push rod, etc., and can drive the first switching switch 510 to be connected with different contacts; for example, one end of the first switching switch 510 is connected with the second live end 420, and the other end of the first switching switch 510 can move in the second voltage transformation end 612 and the third voltage transformation end 613 and be connected with the second voltage transformation end 612 or the third voltage transformation end 613 according to the inter-phase voltage information; specifically, according to the voltage level of the actually connected alternating current power supply, the primary winding 610 can further be provided with a fourth voltage transformation end, a fifth voltage transformation end, etc.; the first switching switch 510 is selectively connected with a suitable voltage transformation end according to the inter-phase voltage information, so as to realize voltage regulation.

[0037] In some embodiments of the utility model, such as Figure 2 As shown in the figure, the phase-to-phase voltage detection module 300 includes a rectifier unit 310, a phase voltage identification unit 320, and a first driving unit 330, the input end of the rectifier unit 310 is connected with each phase connection end to process the phase-to-phase voltage of alternating current into the phase-to-phase voltage signal of direct current, the input end of the phase voltage identification unit 320 is connected with the output end of the rectifier unit 310 to judge whether the phase-to-phase voltage is greater than the voltage threshold according to the phase-to-phase voltage signal, the phase voltage identification unit 320 forms the first trigger signal according to the judgment result, the controlled end of the first driving unit 330 is connected with the output end of the phase voltage identification unit 320, and the first driving unit 330 is connected with the first driving piece 520 to control the first driving piece 520 to switch between at least the first connection state and the second connection state according to the first trigger signal.

[0038] The rectifier unit 310 rectifies the alternating power supply, thereby forming the phase-to-phase voltage signal of direct current, and the phase-to-phase voltage signal represents the size of the output voltage of the rectifier unit 310, for example, taking the voltage levels of 220V and 380V as an example, the voltage threshold is formulated according to the interval of 220V and 380V, the phase voltage identification unit 320 judges whether the phase-to-phase voltage is greater than the voltage threshold according to the phase-to-phase voltage signal, if greater, it proves that the phase-to-phase voltage is 380V, if less, it proves that the phase-to-phase voltage is 220V, and the first trigger signal is formed accordingly, and the first driving unit 330 controls the first driving piece 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 utility model, such as Figure 1 As shown in the figure, the rectifier unit 310 includes a first rectifier bridge 311 and a second rectifier bridge 312, the first phase connection end 110 is connected with the first input end of the first rectifier bridge 311, the second phase connection end 120 is connected with the second input end of the first rectifier bridge 311 and the first input end of the second rectifier bridge 312 respectively, the third phase connection end 130 is connected with the second input end of the second rectifier bridge 312, and the output end of the first rectifier bridge 311 and the output end of the second rectifier bridge 312 are connected in parallel and connected with the input end of the phase voltage identification unit 320.

[0040] The first rectifier bridge 311 and the second rectifier bridge 312 can be full-wave rectifier bridges or full-bridge rectifier bridges, and specifically, the first rectifier bridge 311 and the second rectifier bridge 312 are full-bridge rectifier bridges composed of four diodes, so that the alternating phase-to-phase voltage of the first phase connection end 110 and the second phase connection end 120, the alternating phase-to-phase voltage of the first phase connection end 110 and the third phase connection end 130, and the alternating phase-to-phase voltage of the second phase connection end 120 and the third phase connection end 130 can be rectified.

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

[0042] The phase voltage identification unit 320 uses the voltage stabilizing 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 voltage stabilizing tube Z5, the voltage stabilizing tube Z5 is not conductive, the light emitter of the photoelectric coupler N3 is not lit, the light receiver of the photoelectric coupler N3 is not conductive, the switch Q6 is not conductive, the switch Q7 is conductive, the first driving piece 520 is powered to drive the first switching switch 510 to the first connection state, and when the phase-to-phase voltage is greater than the breakdown voltage of the voltage stabilizing tube Z5, the voltage stabilizing tube Z5 is conductive, the light emitter of the photoelectric coupler N3 is lit, the light receiver of the photoelectric coupler N3 is conductive, the switch Q6 is conductive, the switch Q7 is off, and the first driving piece 520 is powered to drive the first switching switch 510 to the second connection state.

[0043] Specifically, the switch tube Q6 and the switch tube Q7 can be triodes, MOS tubes or silicon-controlled rectifiers.

[0044] In some embodiments of the utility model, as shown in Figure 4 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 with the second live end 420, the third switching switch 450 is connected with the first live end 410, the missing phase detection module 200 is connected with the second driving member 440 and the third driving member 460 respectively, the missing phase detection module 200 controls the second driving member 440 to drive the second switching switch 430 to switch at least between the third connection state and the fourth connection state according to the live phase information, wherein in the third connection state, the second switching switch 430 is connected with the second phase connection end 120 to make the second phase connection end 120 connected with the second live end 420, in the fourth connection state, the second switching switch 430 is connected with the first phase connection end 110 to make the first phase connection end 110 connected with the second live end 420, the missing phase detection module 200 controls the third driving member 460 to drive the third switching switch 450 to switch at least between the fifth connection state and the sixth connection state according to the live phase information, wherein in the fifth connection state, the third switching switch 450 is connected with the first phase connection end 110 to make the first phase connection end 110 connected with the first live end 410, in the sixth connection state, the third switching switch 450 is connected with the third phase connection end 130 to make the third phase connection end 130 connected with the first live end 410.

[0045] The missing phase detection module 200 is connected with the first phase connection end 110, the second phase connection end 120 and the third phase connection end 130 respectively, taking single-phase or three-phase ac power supply connection as an example, for example, when only single-phase ac power supply is connected, and is connected to the first phase connection end 110 and the second phase connection end 120, the missing phase detection module 200 controls the second driving member 440 to drive the second switching switch 430 to switch to the third connection state, and controls the third driving member 460 to drive the third switching switch 450 to switch to the fifth connection state, for example, when only single-phase ac power supply is connected, and is connected to the second phase connection end 120 and the third phase connection end 130, the missing phase detection module 200 controls the second driving member 440 to drive the second switching switch 430 to switch to the third connection state, and controls the third driving member 460 to drive the third switching switch 450 to switch to the sixth connection state.

[0046] In some embodiments of the utility model, such as Figure 3 As shown in the figure, the phase absence detection module 200 includes a first electrification detection unit 210, a second electrification detection unit 220 and a second driving unit 230, the first electrification detection unit 210 is connected with the first phase connection end 110 and the second phase connection end 120 respectively to form a second trigger signal according to whether electrification between the first phase connection end 110 and the second phase connection end 120, the second electrification detection unit 220 is connected with the second phase connection end 120 and the third phase connection end 130 respectively to form a third trigger signal according to whether electrification between the second phase connection end 120 and the third phase connection end 130, the input end of the second driving unit 230 is connected with the output end of the first electrification detection unit 210 and the output end of the second electrification detection unit 220 respectively, the output end of the second driving unit 230 is connected with the second driving member 440 and the third driving member 460 respectively, 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 electrification detection unit 210 detects whether electrification between the first phase connection end 110 and the second phase connection end 120, the second electrification detection unit 220 detects whether electrification between the second phase connection end 120 and the third phase connection end 130, and the second driving unit 230 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 respectively.

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

[0049] When the single-phase AC power supply is accessed and the first phase connection end 110 and the second phase connection end 120 are electrified, the voltage stabilizing tube Z1 is broken down and turned on, the light emitter of the photoelectric coupler N1 is lighted, the light receiver of the photoelectric coupler N1 is turned on, the switch tube Q1 and the switch tube Q3 are both turned on, no matter whether the second phase connection end 120 and the third phase connection end 130 are electrified at this time, the switch tube Q4 is turned off, and the switch tube Q5 is also turned off, 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 the three-phase AC power supply is accessed, the first phase connection end 110, the second phase connection end 120 and the third phase connection end 130 are all electrified, and 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.

[0051] When the single-phase AC power supply is accessed and the second phase connection end 120 and the third phase connection end 130 are electrified, the first phase connection end 110 and the second phase connection end 120 are not electrified, the voltage stabilizing tube Z1 is not broken down, the light emitter of the photoelectric coupler N1 is not lighted, the light receiver of the photoelectric coupler 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, the voltage stabilizing tube Z3 is broken down and turned on, the light emitter of the photoelectric coupler N2 is lighted, the light receiver of the photoelectric coupler 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] The welding machine according to the second aspect of the present application comprises the multi-voltage input control device disclosed in any of the above embodiments.

[0053] The welding machine of the present application uses the multi-voltage input control device disclosed in any of the above embodiments, can be compatible with more voltage grades, is automatically adapted to the input of the single-phase or three-phase AC power supply, can also prevent the user from causing power supply failure due to wiring errors, and is convenient and reliable to use.

[0054] The technical features of the above embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0055] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application 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 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 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, the phase-to-phase voltage detection module being used to detect phase-to-phase voltage information between the energized phase connection terminals; A connection end switching module, the connection end switching module having a first energized end and a second energized end, the connection end switching module being connected to each phase connection end, the connection end switching module being 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, wherein 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 live end, the second live end and the primary winding, and the inter-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 inter-phase voltage information.

2. The 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. The 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 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. 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 negative output end of the first rectifier bridge and the negative output end of the second rectifier bridge. The negative output end of the photodetector of the photocoupler N3 is connected to the head end of the resistor R13, the output end of the photodetector of the photocoupler 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.

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

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 first 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 Z3, the positive electrode of the voltage regulator 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 first end of the resistor R5, the controlled end of the switch tube Q1, the first 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 first end of the resistor R4, the first 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 photocoupler N2 is connected to the first end of the resistor R7. The output end of the light receiver of the photocoupler N2 is respectively connected to the first 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 first end of the resistor R8, the first end of the resistor R11, and the controlled end of the switch tube Q5. The switch tube Q5 and the third driving element are connected in series to form at least part of a third driving branch. The third driving branch is connected to the power supply. The tail ends of the resistors R3, R4, R7, and 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: The device comprises a multi-voltage input control device as claimed in any one of claims 1 to 9.

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