Dual-power control output system

Abstract

The utility model discloses a dual power supply control output system, which comprises a power generation inversion unit, an output unit and a welding unit, and further comprises a multi-gear change-over switch, when the change-over switch is arranged at different gears, two paths of output of the power generation inversion unit are connected in parallel or in series to be used for full power output of the output unit, and the welding unit is used for welding. Or the two paths of outputs of the power generation inversion unit are connected in series and then together with the midpoint output, so that the output unit outputs two different powers, wherein one power is twice that of the other power. According to the utility model, the power generation inversion unit and the welding unit can be ensured to be in a balanced output state when different powers are output, circulation interference is avoided, mutual interference-free independent output of power generation and electric welding is realized, and normal use of the power generation inversion unit and the welding unit is ensured.

Description

Technical Field

[0001] The utility model relates to a dual - power control output system, in particular to a dual - power control output system for a generator - type welding machine. Background Art

[0002] A generator - type welding machine, also known as an engine - driven welding machine, is a machine integrating an engine and a welding machine. The generator generates current through rotation and directly drives the welding machine to work. Generally, there are two most commonly used types: gasoline - powered and diesel - powered, with a small - power auxiliary power supply that can drive small - power devices such as lighting.

[0003] Chinese patent document CN201839071U discloses a dual - power automatic switching control device for a welding machine, including: a control transformer coupled to the external voltage of the welding machine, an input voltage signal sampling unit connected to the voltage output end of the control transformer, a signal processing unit connected to the input voltage signal sampling unit, and an output control circuit connected to the signal processing unit; the signal processing unit includes: a microprocessor with executable code built - in, connected to the signal output end of the voltage - dividing circuit, a first opto - coupler connected to the microprocessor for signal interaction, a relay connected to the control signal output end of the first opto - coupler, and the normally - closed contact and the normally - open contact of the relay are respectively connected to the variable - voltage output end of the control transformer. The utility model has a simple structure and low implementation cost, realizes the automatic switching of dual - power, and through the implementation detection of the grid voltage, regardless of which voltage state the grid voltage is in, it can realize the real - time control of the relay and can achieve protection.

[0004] Although the automatic switching of dual - power is realized in the prior art, for a dual - voltage and dual - inverter generator - type welding machine, in order to obtain dual 120V, there are two sets of independent three - phase windings designed in the medium - frequency generator, which respectively supply power to two sets of 120V frequency - conversion units in the power - generation and inversion unit to invert and generate 120VAC with the same phase. For small - power generator - type welding machines, the AC auxiliary power supply allows 120V or 240V output modes; for power - generation systems with a power greater than 5kW, the auxiliary power supply requires 120V and 240V to be output simultaneously. However, there is a certain circulating - current interference when the existing - technology generator - type welding machine uses 120V and 240V outputs simultaneously, which causes the power - frequency power - generation and inversion system to enter the short - circuit protection program, and seriously, it will cause the rectification part of the power - generation unit or the welding unit to burn out. Summary of the Utility Model

[0005] The present utility model aims to solve the technical problem of current interference easily occurring when a dual power supply is simultaneously used in a power generation welding machine in the prior art, and provides a dual power supply control output system, which includes a power generation and inversion unit, an output unit, and a welding unit, wherein: it further includes a multi - gear change - over switch. When the change - over switch is placed in different gears, the two outputs of the power generation and inversion unit are connected in parallel or in series and then supplied to the output unit for full - power output, or the two outputs of the power generation and inversion unit are connected in series and then output together with the mid - point output to the output unit for outputting two different powers, one of which is twice the other.

[0006] Preferably, the output unit includes a plurality of sockets connected to output circuits of different gears.

[0007] Preferably, the change - over switch includes a three - pole double - throw change - over switch, which has two output gears. One gear outputs the two outputs of the power generation and inversion unit in parallel, and the other gear outputs the two outputs of the power generation and inversion unit in series.

[0008] Preferably, the change - over switch includes a seven - pole triple - throw switch, which has three output gears. One gear outputs the two outputs of the power generation and inversion unit in parallel, one gear outputs the two outputs of the power generation and inversion unit in series, and the remaining gear outputs the two outputs of the power generation and inversion unit in series and connects the mid - point output to the GND position of the socket in the corresponding circuit, and at the same time cuts off the input of the three - phase windings of a set of welding power supply.

[0009] The present utility model has the following beneficial effects:

[0010] 1. The present utility model can ensure that both the power generation and inversion unit and the welding unit are in a balanced output state when outputting different powers, avoid current interference, realize the independent output of power generation and electric welding without interference with each other, and ensure the normal use of the power generation and inversion unit and the welding unit.

[0011] 2. The present utility model has a socket self - locking function. Only when the socket corresponds to the gear of the change - over switch can the corresponding voltage be obtained. When a socket that does not match the gear currently set by the change - over switch is inserted, there is no power and no output, thus effectively avoiding unnecessary harm caused by incorrect socket insertion. Brief Description of the Drawings

[0012] Figure 1 It is a schematic diagram of Embodiment 1 of a dual power supply control output system of the present utility model;

[0013] Figure 2 It is a schematic diagram of Embodiment 2 of a dual power supply control output system of the present utility model. Detailed Description of the Specific Embodiment

[0014] The following is a further detailed description through specific embodiments.

[0015] A dual-power control output system includes a power generation and inversion unit, an output unit, and a welding unit, and further includes a multi-gear changeover switch. The output unit includes multiple sockets connected to output circuits of different gears, and protection units are provided on the output circuits of different gears. The protection unit includes an overload protector and a circuit breaker. When the changeover switch is placed in different gears, the two outputs of the power generation and inversion unit are connected in parallel or in series and then supplied to the output unit to fully power the welding unit, or the two outputs of the power generation and inversion unit are connected in series and then supplied together with the midpoint output to the output unit to output two different powers to the welding unit, where one power is twice the other power.

[0016] Embodiment 1

[0017] Appendix Figure 1 Description of the attached drawings: The three-pole double-throw changeover switch SW1 includes a first pole SW1-1, a second pole SW1-2, and a third pole SW1-3.

[0018] RC1: 240V socket.

[0019] RC2, RC3: 120V sockets.

[0020] CB1, CB2, CB3: Overload protectors.

[0021] M1: Voltage display meter.

[0022] In this embodiment, taking a small-power generator welding machine as an example, the small-power generator welding machine only requires 120V or 240V output. Therefore, the changeover switch adopts a two-gear three-pole double-throw changeover switch, with two gears of output, as Figure 1 shown.

[0023] In the power generation and inversion unit, the inverter P1 outputs single-phase 120V, and the output terminals are points A and B. The inverter P2 outputs single-phase 120V, and the output terminals are points C and D, where BC is the same-name terminal. As Figure 1 shown, the inverter P1-B is connected to the 1-1 position of the changeover switch SW1-1, the inverter P1-A is connected to the 3-1 position of the changeover switch SW1-3, the inverter P2-C is connected to the 2-1 position of the changeover switch SW1-2, and the inverter P2-D is connected to the 1-3 position of the changeover switch SW1-1 and the 3-2 position of the changeover switch SW1-3.

[0024] (1)Switch the switch SW1 to position 1 (1 - 120V). The 1-1 and 1-2 points of the switch SW1-1 are connected, so the inverter P1-B and C’’ are conducting; the 2-1 and 2-2 points of the SW1-2 are connected, then P2-C and C’’ are conducting, so P1-B and P2-C are conducting and connected to the same point. And the 3-1 and 3-2 points of the SW1-3 are connected, then P1-A and P2-D are conducting and connected to the same point. Since the inverter P1-B and the inverter P2-C are conducting, and the inverter P1-A and the inverter P2-D are conducting, the 1 - 120V of P1 and the 1 - 120V of P2 are in-phase and equipotential in parallel at this time, that is, a 1 - 120V voltage is obtained between C’’ and D. C’’ is input to the socket RC2 and the socket RC3 through the overload protector CB1 and the overload protector CB2. Since D is directly connected to the socket RC2 and the socket RC3, the socket RC2 and the socket RC3 output the AC full power of 1 - 120V.

[0025] The 2-1 and 2-3 points of the switch SW1-2 are disconnected, and the 3-1 and 3-3 points of the switch SW1-3 are disconnected. There is no voltage input between A’C’, and there is no voltage on the socket RC1.

[0026] The input of the voltage display meter is DC’’, 1 - 120V, and the input of the voltage display meter realizes adaptive switching input.

[0027] Therefore, when the switch SW1 is switched to position 1 (1 - 120V), the socket RC2 and the socket RC3 output the 1 - 120V voltage at full power, and there is no voltage on the socket RC1. At this time, inserting into the socket RC2 and the socket RC3 can obtain a 120V voltage, and inserting into the socket RC1 has no output. The gear shift automatically realizes the socket output self-locking. When the two sets of three-phase windings are normally input to the welding unit and there is no AC output, the welding unit can output at full power.

[0028] (2)Switch the three-pole double-throw switch SW1 to position 2 (1 - 240V). The 1-1 and 1-3 points of the switch SW1-1 are connected, so the inverter P1-B and P2-D are conducting; the 2-1 and 2-3 points of the switch SW1-2 are connected, then P2-C and C’ are conducting, the 3-1 and 3-2 points of the switch SW1-3 are connected, then P1-A and A’ are conducting, so P1-B and P2-D are conducting, the two windings of P1 and P2 are connected end to end, and the 1 - 120V of P1 and the 1 - 120V of P2 are in series at this time, that is, a voltage of 120V + 120V = 240V is obtained at A’C’. A’ is directly connected to the socket RC1, and C’ is connected to the socket RC1 through the overload protector CB3. The socket RC1 obtains a 1 - 240V voltage output.

[0029] The 1-1 and 1-2 points of the changeover switch SW1-1 are disconnected, and there is no power input to C''; the 2-1 and 2-2 points of SW1-2 are disconnected; the 3-1 and 3-2 points of SW1-3 are disconnected. Therefore, there is no voltage between C'' and D, and there is no voltage on the sockets RC2 and RC3.

[0030] The input of the voltage display meter is A'C', 1~240V, and the input of the voltage display meter realizes adaptive switching input.

[0031] Therefore, when the changeover switch SW1 is thrown to the 2nd gear, the socket RC1 outputs a full power of 1~240V voltage, and there is no voltage on the sockets RC2 and RC3. At this time, there is no output when inserted into the sockets RC2 and RC3, and 240V voltage can be obtained when inserted into the socket RC1, and the socket output is automatically locked when the gear is switched. Two sets of three-phase windings are normally input to the welding unit, and the welding unit can output full power in the case of no AC output.

[0032] In this embodiment, when the changeover switch SW1 is thrown to the 1st gear, the 120VAC output by the power generation and inversion unit is paralleled, and 120VAC is output at full power; when the changeover switch SW1 is thrown to the 2nd gear, the 120VAC output by the power generation and inversion unit is in series, and 240VAC is output at full power; in the above two cases, 120VAC or 240VAC can be output at full power, and both the power generation unit and the welding unit are in a balanced output state, there is no circulating current interference, and power generation and electric welding can achieve interference-free independent output.

[0033] Embodiment 2

[0034] Appendix Figure 2 Description of the accompanying drawings: The seven-knife three-position changeover switch SW0: includes the first knife SW0-1, the second knife SW0-2, the third knife SW0-3, the fourth knife SW0-4, the fifth knife SW0-5, the sixth knife SW0-6, and the seventh knife SW0-7.

[0035] RC6: 120 / 240V socket.

[0036] RC4, RC5: 120V sockets.

[0037] CB4, CB5: Overload protectors.

[0038] CB6: Circuit breaker.

[0039] U1, V1, W1: Generator three-phase winding A.

[0040] BR1: Welding unit three-phase rectifier bridge.

[0041] Voltage detection circuit: includes R1, C1, ZD1, IC1, R2.

[0042] In this embodiment, taking a high-power welding generator as an example, the high-power welding generator needs to output 120V and 240V simultaneously. Therefore, a seven-pole triple-throw switch is adopted as the changeover switch. Through three-gear switching control, it can achieve full-power 120V output, full-power 240V output, and 120 / 240V simultaneous output. In all three modes, welding and power generation can be independently output without interference.

[0043] In the power generation and inversion unit, the inverter P3 outputs single-phase 120V, and the output ports are points A1 and B1; the inverter P4 outputs single-phase 120V, and the output ports are points C1 and D1, where B1 and C1 are the same-name terminals.

[0044] SW0: A seven-pole triple-throw switch, including the first pole SW0-1, the second pole SW0-2, the third pole SW0-3, the fourth pole SW0-4, the fifth pole SW0-5, the sixth pole SW0-6, and the seventh pole SW0-7. The connection between the inverter P3-A1 and the 3-1 position of the changeover switch SW0-3, and the connection between the inverter P3-B1 and the 1-1 position of the changeover switch SW0-1; the connection between the inverter P4-C1 and the 2-1 position of the changeover switch SW0-2, and the connection between the inverter P4-D1 and the 1-3 position of the changeover switch SW0-1, the 1-4 position of the changeover switch SW0-1, the 3-2 position of the changeover switch SW0-3, and the 4-1 position of the changeover switch SW0-4.

[0045] (1) When the changeover switch SW0 is thrown to the first gear (1 - 120V), the sockets RC4 and RC5 output 1 - 120V voltage at full power, and the socket RC6 has no voltage. When the two sets of three-phase windings are normally input to the welding unit and there is no AC output, the welding unit can output at full power.

[0046] Specifically, when the changeover switch SW0 is thrown to the first gear, the 1-1 position and 1-2 of the changeover switch SW0-1 are conducted, and the inverter P3-B1 and C’’ are connected; the 2-1 position and 2-2 of the changeover switch SW0-2 are conducted, and the inverter P4-C1 and C’’ are connected; the 3-1 position and 3-2 of the changeover switch SW0-3 are conducted, and P3-A1 and D1 are connected. Thus, the inverter P3-B1 and the inverter P4-C1 are conducted, the inverter P3-A1 and the inverter P4-D1 are conducted, the 1 - 120V of the inverter P3 and the 1 - 120V of the inverter P4 are connected in the same phase and in parallel, and a voltage of 1 - 120V is obtained between C’’D1. C’’ is connected to the socket RC4 and the socket RC5 through the overload protectors CB4 and CB5 respectively, and D1 is directly connected to the socket RC4 and the socket RC5.

[0047] The 2-1 and 2-3, 2-4 positions of the changeover switch SW0-2 are disconnected, and there is no power at point C'; the 3-1 and 3-3, 3-4 positions of the changeover switch SW0-3 are disconnected, and there is no power at point A'; the 4-1 and 4-3, 4-4 positions of the changeover switch SW0-4 are disconnected, and there is no power at point D'. Thus, there is no power at the socket RC6. Therefore, when the changeover switch SW0 is set to the 1st gear, the sockets RC4 and RC5 output 1 - 120V, and there is no power at the socket RC6. At this time, inserting into the sockets RC4 and RC5 can obtain 120V voltage, while inserting into the socket RC6 has no output, and the gear switching automatically realizes the self-locking of the socket output.

[0048] (2)When the changeover switch SW0 is set to the 2nd gear (1 - 240V), there is no voltage at the sockets RC4 and RC5, and the socket RC6 outputs 1 - 240V voltage at full power. The gear switching automatically realizes the self-locking of the socket output. For the two sets of three-phase windings normally input to the welding unit, in the case of no AC output, the welding unit can output at full power.

[0049] Specifically, when the changeover switch SW0 is set to the 2nd gear, the 1-1 and 1-3 positions of the changeover switch SW0-1 are conducted, and the inverter P3-B1 and the inverter P4-D1 are connected; the 2-1 and 2-3 positions of the changeover switch SW0-2 are conducted, and the inverter P4-C1 and C' are connected; the 3-1 and 3-3 positions of the changeover switch SW0-3 are conducted, and the inverter P3-A1 and A' are connected. The changeover switch P3-B1 and the changeover switch P4-D1 are conducted, and the 1 - 120V of the inverter P3 and the 1 - 120V of the inverter P4 are connected end to end in series, and 1 - 240V voltage is obtained between C'A'. C'A' is connected to the socket RC6 through the circuit breaker CB6, and the socket RC6 obtains 1 - 240V voltage.

[0050] The 1-1 and 1-2 positions of the changeover switch SW0-1 are disconnected, and there is no power at point C''; the 2-1 and 2-2 positions of the changeover switch SW0-2 are disconnected, and there is no power at point C''; the 3-1 and 3-2 positions of the changeover switch SW0-3 are disconnected, and there is no power at point D1. There is no power at C''D1. Therefore, there is no power at the sockets RC4 and RC5.

[0051] There is no power at the sockets RC4 and RC5, and the socket RC6 outputs 1 - 240V. At this time, inserting into the sockets RC4 and RC5 has no output, while inserting into the socket RC6 can obtain 240V voltage, and the gear switching automatically realizes the self-locking of the socket output.

[0052] (3)When SW0 is set to the 3rd gear (120 / 240V), there is no power at the sockets RC4 and RC5, and the socket RC6 outputs 120 / 240V voltage. The gear switching realizes the self-locking of the socket output. For a single set of three-phase windings input to the welding unit, the welding unit outputs at a reduced load.

[0053] Specifically, the changeover switch SW0 is thrown to the 3rd gear. The 1-1 point and 1-4 of the changeover switch SW0-1 are conducted, and the inverter P3-B1 and the inverter P4-D1 are connected. The 2-1 point and 2-4 of the changeover switch SW0-2 are conducted, and the inverter P4-C1 and C’ are connected. The 3-1 point and 3-4 of the changeover switch SW0-3 are conducted, and the inverter P3-A1 and A’ are connected. The 4-1 point and 4-4 of the changeover switch SW0-4 are conducted, and the inverter P4-D1 and D are connected. Thus, the inverter P3-B1 and the inverter P4-D1 are conducted. The 1-120V of the inverter P3 and the 1-120V of the inverter P4 are connected end to end in series. A voltage of 1-240V is obtained between C’A’. The D’ connected end to end and C’A’ are connected to the socket RC6 through the circuit breaker CB6, and the socket RC6 obtains a voltage of 120 / 240V.

[0054] The changeover switch SW0 is thrown to the 3rd gear. The 1-1 point and 1-2 of the changeover switch SW0-1 are disconnected, and there is no power at the C’’ point. The 2-1 point and 2-2 of the changeover switch SW0-2 are disconnected, and there is no power at the C’’ point. The 3-1 point and 3-2 of the changeover switch SW0-3 are disconnected, and there is no power at the D1 point. There is no power at C’’D1, so there is no power at the socket RC4 and the socket RC5.

[0055] Therefore, when the changeover switch SW0 is thrown to the 3rd gear, there is no power at the socket RC4 and the socket RC5, and the socket RC6 outputs 120 / 240V. The gear shift realizes the self-locking function of the socket voltage output.

[0056] Moreover, the changeover switch SW0 is thrown to the 3rd gear. At this time, both the three-phase winding A and the BR1 rectifier bridge are in a disconnected state. The two sets of three-phase windings of the motor have no potential connection in the welding circuit, cutting off the short-circuit circulating current path generated by the two sets of windings in the power frequency inverter circuit, ensuring the normal output of the power frequency inverter 120 / 240V, and making the welding and power generation not interfere with each other and output independently.

[0057] At the same time, there is no voltage input to the voltage detection circuit. SW1 outputs a switching signal to act on the current switching control circuit of the welding power supply, and reduces the output in a derated manner.

[0058] In this embodiment, when the changeover switch SW0 is thrown to the 1st gear, the 120V outputs of the two paths of the power generation and inversion unit with the same phase are paralleled, and 120V is output at full power; when the changeover switch SW0 is thrown to the 2nd gear, the 120V outputs of the two paths of the power generation and inversion unit with the same phase are connected end to end, and 240V is output at full power; when the changeover switch SW0 is thrown to the 3rd gear, the 120V outputs of the two paths of the power generation and inversion unit with the same phase are connected end to end, and the midpoint output is connected to the socket GND position. The socket can output 120 / 240V. At the same time, the three-phase windings of a set of welding power supply are cut off from the input, and the potential connection formed by the rectification and parallel connection of the two sets of three-phase windings inside the welding unit is disconnected, so as to avoid the possibility of forming a circulating current through the midpoint connection of the two sets of three-phase inputs of the power generation and inversion unit by the IGBT. The power generation and the electric welding can be independently output without interference with each other.

[0059] To sum up, in the present utility model, for a small-power dual-voltage generator welder, it is output in two gears through a three-pole double-throw changeover switch. When the changeover switch is thrown to the first gear (120V), the 120VAC output by the power generation and inversion unit is paralleled, and 120VAC is output at full power; when the changeover switch is thrown to the second gear (240V), the 120VAC output by the power generation and inversion unit is connected in series, and 240VAC is output at full power. In the above two cases, 120VAC or 240VAC can be output at full power. The power generation and inversion unit and the welding unit are both in a balanced output state, without circulating current interference, and the power generation and the electric welding can be independently output without interference with each other.

[0060] For a large-power dual-voltage generator welder, it is output in three gears through a seven-pole triple-throw switch. When the changeover switch is thrown to the 1st gear, the 120V outputs of the two paths of the power generation and inversion unit with the same phase are paralleled, and 120V is output at full power; when the changeover switch is thrown to the 2nd gear, the 120V outputs of the two paths of the power generation and inversion unit with the same phase are connected end to end, and 240V is output at full power; when the changeover switch is thrown to the 3rd gear, the 120V outputs of the two paths of the power generation and inversion unit with the same phase are connected end to end, and the midpoint output is connected to the socket GND position. The socket can output 120 / 240V. At the same time, the three-phase windings of a set of welding power supply are cut off from the input, and the potential connection formed by the rectification and parallel connection of the two sets of three-phase windings inside the welding unit is disconnected, so as to avoid the possibility of forming a circulating current through the midpoint connection of the two sets of three-phase inputs of the power generation and inversion unit by the IGBT. The power generation and the electric welding can be independently output without interference with each other.

[0061] The above are only the embodiments of the present utility model. Common knowledge such as the specific structures and characteristics known in the art is not described in detail herein. Those of ordinary skill in the art know all the common general technical knowledge in the technical field to which the utility model belongs before the application date or the priority date, can learn all the existing technologies in this field, and have the ability to apply the conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application, complete and implement this solution in combination with their own abilities. Some typical known structures or known methods should not become obstacles for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope required by this application should be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A dual-power control output system, comprising a power generation and inversion unit, an output unit, and a welding unit, characterized in that: It further includes a multi - gear change - over switch. When the change - over switch is placed in different gears, the two - way outputs of the power generation and inversion unit are connected in parallel or in series to supply full - power output to the output unit, or the two - way outputs of the power generation and inversion unit are connected in series and the mid - point output is also supplied to the output unit to output two different powers, where one power is twice that of the other.

2. The dual-power control output system according to claim 1, characterized in that: The output unit includes a plurality of sockets connected to output circuits of different gears.

3. The dual-power control output system according to claim 2, wherein: The change - over switch includes a three - pole double - throw change - over switch, which has two - gear outputs. In one gear, the two - way outputs of the power generation and inversion unit are connected in parallel, and in the other gear, the two - way outputs of the power generation and inversion unit are connected in series.

4. The dual-power control output system according to claim 2, wherein: The change - over switch includes a seven - pole three - throw switch, which has three - gear outputs. In one gear, the two - way outputs of the power generation and inversion unit are connected in parallel. In one gear, the two - way outputs of the power generation and inversion unit are connected in series. In the remaining gear, the two - way outputs of the power generation and inversion unit are connected in series and the mid - point output is connected to the GND position of the socket in the corresponding circuit, and at the same time, the three - phase windings of a set of welding power supply are cut off from the input.

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