CN106825861B - A kind of the welding mode switching circuit and method of welding integrated power supply - Google Patents
A kind of the welding mode switching circuit and method of welding integrated power supply Download PDFInfo
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- CN106825861B CN106825861B CN201710155160.7A CN201710155160A CN106825861B CN 106825861 B CN106825861 B CN 106825861B CN 201710155160 A CN201710155160 A CN 201710155160A CN 106825861 B CN106825861 B CN 106825861B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
- B23K9/1043—Power supply characterised by the electric circuit
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Abstract
The invention discloses a kind of welding integrated power supply welding mode switching circuit and methods；Including welding relay group, relay group, transformer group, rectifier diode, filter inductance and phase-shifting full-bridge unit are cut；Phase-shifting full-bridge unit, transformer group, rectifier diode and filter inductance are sequentially connected, and when welding relay group closure and cutting relay group disconnects, the output of transformer group is parallel connection, and welding integrated power supply is bond pattern at this time, exports the source of welding current；When cutting relay group closure and welding relay group disconnects, the output of transformer group is parallel connection after first series connection, and welding integrated power supply is cut mode at this time, exports cutting power supply.The present invention welds and cut mode uses same group of transformer, reduces transformer total quantity, reduces weight, the volume of machine, disperses transformer heat.
Description
Technical field
The invention belongs to Arc Welding Power technical fields, are cut more particularly, to a kind of welding pattern of welding integrated power supply
Change circuit and method.
Background technology
In modern industry field, welding and cutting are two kinds of fundamental technologies of equal importance.Cutting metal material is weldering
The preceding working procedure connect.Since the nineties, modern times welding and cutting technique are equally constantly being mutually promoted and are being developed, with weldering
The raising of yield and quality and the degree of automation of delivering a child, the efficiency and quality of cutting will directly affect the efficiency and quality of welding production.
Wherein, for inverter type welding/cutting integrated power supply because its is small, efficient and cut quality is more excellent and has obtained quick and extensive
Development.
Existing welding integrated power supply, most of structure using single phase transformer, multiple transformers combination are often adopted
Different transformers is respectively adopted in the mode switched with primary side, arc-welding and cutting, and machine volume, weight is caused to increase.
Invention content
In view of the drawbacks of the prior art, the purpose of the present invention is to provide a kind of welding pattern switchings of welding integrated power supply
Circuit, it is intended to which it is complicated to solve the switching of existing welding/cutting power supply bond pattern/cut mode, and transformer redundancy is more, bulky problem.
The present invention provides a kind of welding mode switching circuits of welding integrated power supply, including：Weld relay group, cutting
Relay group, transformer group, rectifier diode, filter inductance and phase-shifting full-bridge unit；It is phase-shifting full-bridge unit, transformer group, whole
Stream diode and filter inductance are sequentially connected, and the input terminal of welding relay group is connected to the first output end of filter inductance, weldering
The output end of contact relay group is for exporting the source of welding current；The input terminal of cutting relay group is connected to the of the filter inductance
Two output ends, the output end of the cutting relay group is for exporting cutting power supply；When welding relay group be closed and cut after
When electric appliance group disconnects, the output of transformer group is parallel connection, and welding integrated power supply is bond pattern at this time, exports the source of welding current；
When cutting relay group closure and welding relay group disconnects, the output of transformer group is parallel connection after first series connection, is welded at this time
It is cut mode to cut integrated power supply, exports cutting power supply.
Further, transformer group includes：M transformer is connected to the phase shift after the primary side series connection of M transformer
The secondary side of the output end of full bridge unit, each transformer is connect with the input terminal of the rectifier diode, and each transformer
Output negative pole of the secondary side centre tap as the welding mode switching circuit of the welding integrated power supply；Wherein, M be more than or equal to
2 positive integer.
Further, welding relay group includes：(M+K) a welding relay, wherein M are transformer number, and K is to cut
Cut state parallel connection way.The connection of welding relay makes rectification branch anode be connected, and cathode is connected；I.e. rectification branch exports simultaneously
Connection.
Further, cutting relay group includes：(M-K) a cutting relay, wherein M are transformer number, and K is to cut
State parallel connection way is cut, the connection for cutting relay makes rectification branch positive electrode and negative electrode be sequentially connected.That is rectification branch is first gone here and there
Connection is in parallel again.
Further, when work, when power supply switchs to welded condition by standby mode, control welding relay group is closed
It closes, when welding relay group closure, control phase-shifting full-bridge switching tube is in running order, and out-put supply is as welding electricity at this time
Source；When power supply switchs to standby mode by welded condition, control phase-shifting full-bridge switching tube is closed, when welding relay
When group no current, control welding relay group disconnects；When power supply switchs to cut state by standby mode, control cutting relay
Group is closed, and when cutting relay group and being closed, control phase-shifting full-bridge switching tube is in running order, and out-put supply is as cutting at this time
Cut power supply；When power supply switchs to standby mode by cut state, control phase-shifting full-bridge switching tube be closed, when cutting after
When electric appliance group no current, control cutting relay group disconnects；When power supply switchs to welded condition by cut state, control phase shift is complete
Bridge switch pipe is closed, and when cutting relay group no current, control cutting relay group disconnects, and welding relay group is closed
It closes；When welding relay closure, control phase-shifting full-bridge switching tube is in running order, and out-put supply is as welding electricity at this time
Source；When power supply switchs to cut state by welded condition, control phase-shifting full-bridge switching tube is closed, when welding relay group no current
When, control welding relay group disconnects, and cutting relay group is closed；When cutting relay closure, phase-shifting full-bridge is controlled
Switching tube is in running order, and out-put supply is as cutting power supply at this time.
The present invention provides a kind of methods of the welding mode switching circuit based on above-mentioned welding integrated power supply, including under
State step：When power supply switchs to welded condition by standby mode, control welding relay group is closed, when welding relay group is closed
When, control phase-shifting full-bridge switching tube is in running order, and out-put supply is as the source of welding current at this time；When power supply is turned by welded condition
For standby mode when, control phase-shifting full-bridge switching tube be closed, when weld relay group no current, control weld after
Electric appliance group disconnects；Or when power supply switchs to cut state by standby mode, control cutting relay group is closed, when cutting relay
When device group is closed, control phase-shifting full-bridge switching tube is in running order, and out-put supply is as cutting power supply at this time；When power supply is by cutting
When the state of cutting switchs to standby mode, control phase-shifting full-bridge switching tube is closed, when cutting relay group no current, control
System cutting relay group disconnects.
Further, when power supply switchs to welded condition by cut state, control phase-shifting full-bridge switching tube is closed, when cutting
When cutting relay group no current, control cutting relay group disconnects, and welding relay group is closed；When welding relay is closed
When, control phase-shifting full-bridge switching tube is in running order, and out-put supply is as the source of welding current at this time.
Further, when power supply switchs to cut state by welded condition, control phase-shifting full-bridge switching tube is closed, and weldering is worked as
When contact relay group no current, control welding relay group disconnects, and cutting relay group is closed；When cutting relay is closed
When, control phase-shifting full-bridge switching tube is in running order, and out-put supply is as cutting power supply at this time.
Contemplated above technical scheme through the invention, compared with prior art, due to using transformer with split winding and leading to
It crosses relay and carries out connection in series-parallel combination in a manner of changing the total no-load voltage ratio of transformer, can obtain and reduce single transformer volume, excellent
Change heat dissipation, optimization structure, utilization rate, the simple advantageous effect of welding pattern switching for increasing transformer.
Description of the drawings
Fig. 1 is the functional block diagram of welding integrated power supply welding mode switching circuit provided by the invention.
Fig. 2 is the circuit diagram of welding integrated power supply welding mode switching circuit provided by the invention.
Fig. 3 is the electricity for the welding integrated power supply welding mode switching circuit that the embodiment of the present invention provides (by taking M is equal to 6 as an example)
Road schematic diagram.
Fig. 4 is the relay group structural schematic diagram in welding integrated power supply welding mode switching circuit provided by the invention.
Fig. 5 is the flow realization figure of welding integrated power supply welding mode switching method provided by the invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention welds and cut mode uses same group of transformer, is switched over by relay on secondary side.Compared to
Welding and cutting use the design of two groups of transformers respectively, can reduce the quantity of transformer half, reduce machine volume, improve
Power density.
As depicted in figs. 1 and 2, the present invention provides a kind of welding mode switching circuits of welding integrated power supply, including：Weldering
Contact relay group 1, cutting relay group 2, transformer group 3, rectifier diode 4, filter inductance 5 and phase-shifting full-bridge unit 6；Its
In, transformer group 3 is welding, cutting shares；Transformer group 3 includes M transformer, and (M is the positive integer more than or equal to 2, M's
Value is related with structure with output power, and the value of M is bigger, and the volume of required single transformer is smaller)；M transformer primary side string
Connection is followed by 6 output end of phase-shifting full-bridge unit.Transformer secondary uses full-wave rectification, full-wave rectification output cathode to connect filter inductance
5.Each transformer secondary centre tap is cathode.Relay group carries out bond pattern, cut mode switching, welds relay
Number be M+2, cut relay quantity be M-2.It welds when relay group is closed, cutting relay group disconnects as welding mould
Formula can be used as the source of welding current at this point, the output of transformer group is parallel connection.It is disconnected to cut relay group closure, welding relay group
It is that cut mode can be used as cutting power supply at this point, the output of transformer group is parallel connection again of first connecting when opening.
As shown in figure 3, by taking M is equal to 6 as an example, details are as follows：Transformer group 3 includes six transformers being sequentially connected in series
T1, T2, T3, T4, T5, T6, transformer T1-T6 primary sides are sequentially connected in series, i.e. transformer T1 second output terminals connection transformer T2's
First output end, the first output end of the second output terminal connection transformer T3 of transformer T2, transformer T3 second output terminals connect
Connect the first output end of transformer T4, transformer T4 second output terminals connect the first output end of transformer T5, transformer T5 the
Two output ends connect the first output end of transformer T6.The midpoint of the first output end connection phase-shifting full-bridge bridge arm 1 of transformer T1,
The midpoint of the second output terminal connection phase-shifting full-bridge bridge arm 2 of transformer T6, resonant inductance LrFirst output end connects phase-shifting full-bridge
The midpoint of bridge arm 2, resonant inductance Lr second output terminals connect phase-shifting full-bridge clamper arm midpoint.
Transformer T1-T6 pairs side is combined by welding relay group 1 and cutting relay group 2, when welding, welding after
Electric appliance is closed, cutting relay disconnects, and transformer T1-T6 pairs side is in parallel.When cutting, welding relay group disconnects, cuts relay
Device group is closed, transformer T1-T3 series connection, T4-T6 series connection, and two groups of transformer secondaries are in parallel again.Using six transformers be due to
In case study on implementation welding/cutting power supply output power be 12KW, and select magnetic core of transformer transimission power be 2KW when, effect is most
It is good, therefore selected transformer is 12 ÷ 2=6.
Rectifier diode 4 includes six rectifier diodes D1, D2, D3, D4, D5, D6；Filter inductance 5 includes six filtering
Inductance L1, L2, L3, L4, L5, L6；Transformer T1 pairs side is connected to rectifier diode D1, and rectifier diode D1 is connected to filtered electrical
Feel L1, the filter inductance L1 other ends are connected to output cathode, and transformer T1 centre taps are connected to relay 21 and 11.Transformer
T2 pairs side is connected to rectifier diode D2, and rectifier diode is connected to filter inductance L2, the filter inductance L2 other ends be connected to after
Electric appliance 21 and 12, transformer T2 centre taps are connected to relay 22 and 13.Transformer T3 pairs side is connected to rectifier diode D3,
Rectifier diode is connected to filter inductance L3, and the filter inductance L3 other ends are connected to relay 22 and 14, are taken out among transformer T3
Head is connected to output negative pole.Transformer T4 pairs side is connected to rectifier diode D4, and rectifier diode is connected to filter inductance L4, filter
The wave inductance L4 other ends are connected to output cathode, and transformer T4 centre taps are connected to relay 23 and 15.Transformer T5 pairs side
It is connected to rectifier diode D5, rectifier diode is connected to filter inductance L5, and the filter inductance L5 other ends are connected to relay 23
With 16, transformer T5 centre taps are connected to relay 24 and 17.Transformer T6 pairs side is connected to rectifier diode D6, rectification two
Pole pipe is connected to filter inductance L6, and the filter inductance L6 other ends are connected to relay 24 and 18, the connection of transformer T6 centre taps
To output negative pole.
The present invention also provides a kind of welding mode switching methods of welding integrated power supply, including phase-shifting full-bridge unit to export
Sequential, relay disconnect, are closed sequential.Arc-welding cuts integrated power supply altogether there are three types of working condition, respectively standby, weld, cut
It cuts.When power supply is in standby, phase-shifting full-bridge switching tube is not exported without driving.It is equal to weld relay group, cutting relay group
It is off.Output voltage is 0V.When power supply is in welded condition, phase-shifting full-bridge switching tube is in running order, welding
Relay group is closed, and cutting relay group disconnects.When power supply is in cut state, phase-shifting full-bridge switching tube has a driving, welding after
Electric appliance group disconnects, and cutting relay group is closed.
In embodiments of the present invention, when power supply switchs to welded condition by standby mode, control welding relay group is closed,
When welding relay group closure, control phase-shifting full-bridge switching tube is in running order, and out-put supply is as the source of welding current at this time.
When power supply switchs to standby mode by welded condition, control phase-shifting full-bridge switching tube is closed, when welding relay group
When no current, control welding relay group disconnects.When power supply switchs to cut state by standby mode, control cutting relay group
It is closed, when cutting relay group closure, control phase-shifting full-bridge switching tube is in running order, and out-put supply is as cutting at this time
Power supply.When power supply switchs to standby mode by cut state, control phase-shifting full-bridge switching tube is closed, when cutting relay
When device group no current, control cutting relay group disconnects.
When power supply switchs to welded condition by cut state, control phase-shifting full-bridge switching tube is closed, when cutting relay group
When no current, control cutting relay group disconnects, and welding relay group is closed；When welding relay closure, control moves
Phase full-bridge switch pipe is in running order, and out-put supply is as the source of welding current at this time.When power supply switchs to cutting shape by welded condition
When state, control phase-shifting full-bridge switching tube is closed, and when welding relay group no current, control welding relay group disconnects, and will
Relay group is cut to be closed；When cutting relay closure, control phase-shifting full-bridge switching tube is in running order, at this time output electricity
Source is as cutting power supply.
The present invention proposes a kind of arc-welding cutting integrated power supply main circuit switching circuit and switching method, arc-welding cutting power supply
Welding cutting shares one group of transformer, and connection in series-parallel combination is carried out with relay in secondary lateral dominance.The series-parallel structure disperses of transformer
Transformer heat reduces power transformer sum, reduces power volume, weight.
As shown in figure 3, in embodiments of the present invention, transformer T1 pairs side is connected to rectifier diode D1, rectifier diode
It is connected to filter inductance L1, the filter inductance L1 other ends are connected to output cathode, and transformer T1 centre taps are connected to relay
21 and 11.Transformer T2 pairs side is connected to rectifier diode D2, and rectifier diode is connected to filter inductance L2, and filter inductance L2 is another
One end is connected to relay 21 and 12, and transformer T2 centre taps are connected to relay 22 and 13.Transformer T3 pairs side is connected to
Rectifier diode D3, rectifier diode are connected to filter inductance L3, and the filter inductance L3 other ends are connected to relay 22 and 14, become
Depressor T3 centre taps are connected to output negative pole.Transformer T4 pairs side is connected to rectifier diode D4, and rectifier diode is connected to
Filter inductance L4, the filter inductance L4 other ends are connected to output cathode, and transformer T4 centre taps are connected to relay 23 and 15.
Transformer T5 pairs side is connected to rectifier diode D5, and rectifier diode is connected to filter inductance L5, and the filter inductance L5 other ends connect
It is connected to relay 23 and 16, transformer T5 centre taps are connected to relay 24 and 17.Transformer T6 pairs side is connected to rectification two
Pole pipe D6, rectifier diode are connected to filter inductance L6, and the filter inductance L6 other ends are connected to relay 24 and 18, transformer T6
Centre tap is connected to output negative pole.
Single transformer no-load voltage ratio is N, and in welding, total no-load voltage ratio is M*N, wherein M is transformer sum.Total no-load voltage ratio when cutting
For M*N/m, wherein M is transformer sum, and m is the transformer number of secondary side parallel connection.In this instance, transformer sum M is 6, is become
Transformer voltage ratio N is 5:3, the transformer number m of secondary side parallel connection are 3, and when welding, total no-load voltage ratio was 10:1, when cutting, total no-load voltage ratio was 10:
3。
Integrated power supply main circuit switching method is cut in arc-welding, when the advantage is that carrying out welding cut mode switches, relay
Attonity electric current in device increases the working life and reliability of switching relay.
As shown in figure 4, cutting the connection type of relay group for welding relay assembly.
As shown in figure 5, there are three types of switch modes, respectively standby mode, bond pattern, cutting for arc-welding cutting integrated power supply
Pattern.Without output under standby mode, the source of welding current is can be used as under bond pattern, can be used as cutting power supply under cut mode.
It is first block phase-shifting full-bridge driving to be switched to bond pattern by standby mode, recloses welding relay group, is closing
During closing relay, attonity electric current, relay is then turned on driving after being closed.
It is first block phase-shifting full-bridge driving to be switched to standby mode by bond pattern, then disconnects welding relay group, disconnected
During open relay, attonity electric current.
It is first block phase-shifting full-bridge driving to be switched to cut mode by standby mode, recloses cutting relay group, is closing
During closing relay, attonity electric current, relay is then turned on driving after being closed.
It is first block phase-shifting full-bridge driving to be switched to standby mode by cut mode, then disconnects cutting relay group, disconnected
During open relay, attonity electric current.
It is first block phase-shifting full-bridge driving to be switched to cut mode by bond pattern, then disconnects welding relay group, is closed
Relay group is cut, during the actuating of relay, attonity electric current, relay is then turned on driving after being closed.
It is first block phase-shifting full-bridge driving to be switched to bond pattern by cut mode, then disconnects cutting relay group, is closed
Relay group is welded, during the actuating of relay, attonity electric current, relay is then turned on driving after being closed.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should all include
Within protection scope of the present invention.
Claims (8)
1. a kind of welding mode switching circuit of welding integrated power supply, which is characterized in that including：Weld relay group (1), cutting
Relay group (2), transformer group (3), rectifier diode (4), filter inductance (5) and phase-shifting full-bridge unit (6)；
The phase-shifting full-bridge unit (6), the transformer group (3), the rectifier diode (4) and the filter inductance (5) according to
The input terminal of secondary connection, the welding relay group (1) is connected to the first output end and transformer group of the filter inductance (5)
(3) centre tap, the output end of the welding relay group (1) is for exporting the source of welding current；The cutting relay group (2)
Input terminal is connected to the first output end of the filter inductance (5), and the output end for cutting relay group (2) is connected to described
The centre tap of transformer group (3)；
When welding relay group (1) closure and cutting relay group (2) disconnects, transformer group (3) output is parallel connection, this
When welding integrated power supply be bond pattern, export the source of welding current；When cutting relay group (2) is closed and welds relay group (1)
When disconnection, transformer group (3) output is parallel connection again of first connecting, and welding integrated power supply is cut mode, output cutting at this time
Power supply.
2. welding mode switching circuit as described in claim 1, which is characterized in that the transformer group (3) includes：M change
Depressor is connected to the output end of the phase-shifting full-bridge unit (6), the secondary side of each transformer after the primary side series connection of M transformer
It is connect with the input terminal of the rectifier diode (4), and the secondary side centre tap of each transformer is as welding one electricity
The output negative pole of the welding mode switching circuit in source；Wherein, M is the positive integer more than or equal to 2.
3. welding mode switching circuit as described in claim 1, which is characterized in that the welding relay group (1) includes：(M
+ K) a welding relay, the connection for welding relay makes rectification branch anode be connected, and cathode is connected；Wherein M is transformer
Number, K are cut state parallel connection way.
4. welding mode switching circuit as described in any one of claims 1-3, which is characterized in that the cutting relay group
(2) include：(M-K) a cutting relay, the connection for cutting relay make rectification branch positive electrode and negative electrode be sequentially connected；Wherein
M is transformer number, and K is cut state parallel connection way.
5. welding mode switching circuit as described in any one of claims 1-3, which is characterized in that when work, when power supply is by waiting for
When machine state switchs to welded condition, control welding relay group is closed, and when welding relay group closure, control phase-shifting full-bridge is opened
Pass pipe is in running order, and out-put supply is as the source of welding current at this time；When power supply switchs to standby mode by welded condition, control
Phase-shifting full-bridge switching tube is closed, and when welding relay group no current, control welding relay group disconnects；
When power supply switchs to cut state by standby mode, control cutting relay group is closed, when cutting relay group closure,
Control phase-shifting full-bridge switching tube is in running order, and out-put supply is as cutting power supply at this time；When power supply is switched to by cut state
When standby mode, control phase-shifting full-bridge switching tube is closed, when cutting relay group no current, control cutting relay
Device group disconnects；
When power supply switchs to welded condition by cut state, control phase-shifting full-bridge switching tube is closed, when cutting relay group is without electricity
When stream, control cutting relay group disconnects, and welding relay group is closed；When welding relay closure, control phase shift is complete
Bridge switch pipe is in running order, and out-put supply is as the source of welding current at this time；
When power supply switchs to cut state by welded condition, control phase-shifting full-bridge switching tube is closed, when welding relay group is without electricity
When stream, control welding relay group disconnects, and cutting relay group is closed；When cutting relay closure, control phase shift is complete
Bridge switch pipe is in running order, and out-put supply is as cutting power supply at this time.
6. a kind of method of the welding mode switching circuit based on welding integrated power supply described in claim 1, which is characterized in that
Include the following steps：
When power supply switchs to welded condition by standby mode, control welding relay group is closed, when welding relay group closure,
Control phase-shifting full-bridge switching tube is in running order, and out-put supply is as the source of welding current at this time；When power supply is switched to by welded condition
When standby mode, control phase-shifting full-bridge switching tube is closed, when welding relay group no current, control welding relay
Device group disconnects；
When power supply switchs to cut state by standby mode, control cutting relay group is closed, when cutting relay group closure,
Control phase-shifting full-bridge switching tube is in running order, and out-put supply is as cutting power supply at this time；When power supply is switched to by cut state
When standby mode, control phase-shifting full-bridge switching tube is closed, when cutting relay group no current, control cutting relay
Device group disconnects.
7. method as claimed in claim 6, which is characterized in that when power supply switchs to welded condition by cut state, control moves
Phase full-bridge switch pipe is closed, and when cutting relay group no current, control cutting relay group disconnects, and will weld relay group
It is closed；When welding relay closure, control phase-shifting full-bridge switching tube is in running order, and out-put supply is as welding electricity at this time
Source.
8. method as claimed in claim 6, which is characterized in that when power supply switchs to cut state by welded condition, control moves
Phase full-bridge switch pipe is closed, and when welding relay group no current, control welding relay group disconnects, and will cut relay group
It is closed；When cutting relay closure, control phase-shifting full-bridge switching tube is in running order, and out-put supply is as cutting electricity at this time
Source.
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| CN110401358A (en) * | 2018-04-25 | 2019-11-01 | 马春辉 | Inverter component, welding/cutting power supply output device and welding and cutting device |
| CN110548965B (en) * | 2019-09-11 | 2021-09-28 | 上海沪工焊接集团股份有限公司 | Control circuit and method of inverter type multifunctional direct current arc welding machine |
| CN115365625B (en) * | 2022-08-31 | 2023-09-22 | 深圳市佳士科技股份有限公司 | Circuit and device for cutting and welding |
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| US6051804A (en) * | 1996-01-16 | 2000-04-18 | Illinois Tool Works Inc. | Plasma cutting or arc welding power supply with phase staggered secondary switchers |
| CN201076966Y (en) * | 2007-04-16 | 2008-06-25 | 邢宝祥 | Multifunctional welding machine |
| CN201183165Y (en) * | 2008-04-15 | 2009-01-21 | 深圳市佳士科技发展有限公司 | Four-function inversion type welding machine |
| CN201183164Y (en) * | 2008-04-16 | 2009-01-21 | 深圳市佳士科技发展有限公司 | Electric shock preventing multifunctional inversion type welding machine |
| CN201862897U (en) * | 2010-10-19 | 2011-06-15 | 深圳市华意隆实业发展有限公司 | Multifunctional inverter type welding and cutting machine |
| CN203621745U (en) * | 2013-12-16 | 2014-06-04 | 浙江金美电动工具有限公司 | Three-purpose inverter welder |
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| CN106825861A (en) | 2017-06-13 |
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