CN102554441B - Constant-current control device for welding power source of medium-frequency inverter resistance electric welding machine and control method for welding power source - Google Patents
Constant-current control device for welding power source of medium-frequency inverter resistance electric welding machine and control method for welding power source Download PDFInfo
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- CN102554441B CN102554441B CN201110397871.8A CN201110397871A CN102554441B CN 102554441 B CN102554441 B CN 102554441B CN 201110397871 A CN201110397871 A CN 201110397871A CN 102554441 B CN102554441 B CN 102554441B
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Abstract
The invention discloses a constant-current control device for a welding power source of a medium-frequency inverter resistance electric welding machine and a control method for the welding power source. The constant-current control device comprises a high-speed single chip microcomputer (6), a primary welding current acquisition unit (7), a filter unit (8), an IGBT (insulated gate bipolar transistor) driving unit, a comparator (10) and a power unit (11) for supplying power to the single chip microcomputer. At least two signal input ends and four signal output ends are arranged on the high-speed single chip microcomputer (6), an output end of the comparator (10) outputs welding current TTL (transistor-transistor logic) time sequence square-wave signals and is connected with an interrupt end of hardware of the high-speed single chip microcomputer (6), and the four signal output ends of the high-speed single chip microcomputer (6) are connected with four IGBT driving modules. The constant-current control device has the advantages that the hardware structure of the control device is simpler than that of a similar control device, the cost is low, the control function is strong, constant-current control precision is high and is less than or equal to 3%, constant-current compensation response speed is high, and the welding power source is regulated and controlled once per MS (time of response).
Description
Technical field
The present invention relates to electric resistance welding control appliance field, particularly a kind of control device of the medium-frequency inverting resistance welding machine source of welding current and control method thereof.
Background technology
Electric resistance welding is one of main welding method, very extensive in field of industrial production application such as Aeronautics and Astronautics, automobile, engineering machinery; Resistance welder is mainly divided into single phase industrial frequence by the form of its source of welding current and exchanges, phase secondary rectification, capacitor discharge welding, medium frequency inverter weldering etc.Wherein, medium frequency inverter electric resistance welding can be realized the precise treatment welding of butt-welding fitting, meets the new demand that new material, development of new techniques propose welding, this efficient, light and handy, and energy-conservation Novel welding power supply is the developing direction of resistance welding power source from now on.
Medium frequency inverter electric resistance welding has the advantages that electrical network three-phase is balanced, power factor is high, save energy resource consumption.Reverse frequency is 1KHZ, the output of welding current secondary commutation, and constant current is controlled, and the adjustment of welding current is the intermediate frequency adjustment of 1000 times per second, is 1/20 of traditional SCR type resistance control, and control accuracy is high, and heating current density is large.Through practical application, the process advantage that it has wider parameter adjustability and direct current welding, is easy to obtain reliable in quality, surface aesthetic, nugget size, the satisfactory solder joint of solder joint pulling force.
In the product structure of resistance welder production industry, medium-frequency inverting resistance welding machine with high content of technology, research and the commercialization of the inversion weldering that (mainly refers to the U.S., Japan, Germany) are abroad quite ripe, successively release inverter type resistance welding machine product, entered widely practical stage.A lot of companies can produce accurate inverter resistance welder and supporting intermediate frequency welding transformer, and at home, and in recent years, inversion resistance welding technology was also applied starting; Abroad, domestic inversion weldering controls above, reverse frequency is between 1K～4K, wherein major part is 1K.
The quality control method of resistance welded: mainly contain constant voltage and control, constant current is controlled, and permanent power is controlled.But, in constant voltage control mode welding process, Current Control precision is poor, the stability of welding quality is not fine, permanent power is controlled and can have been guaranteed well welding quality, but to controller technology require high, as detection technique and control technology etc., at home and abroad in business-like electrical resistance weld controller application seldom; In long-term practice, prove, in welding process, the stability of welding current controlled well both can be controlled welding quality well, so, up to the present, constant current is controlled in quality of resistance welds monitoring both domestic and external and is most widely used, but has technically the height of level when concrete enforcement, shows in constant-current control accuracy and current compensation response speed; The medium-frequency resistance welding machine of external a lot of welding machine production company has nearly all adopted constant current control, but the hardware circuit of welding current modulation adopts analog quantity to control more, circuit is complicated, also makes its control system more complex with respect to common AC Resistance Welding machine, maintenance difficult after being out of order.
Resistance welding power source is because power output is large, so the major loop of its source of welding current is nearly all following circuit structure: the ac grid voltage of three-phase 50Hz is through being input to three-phase bridge rectifier rectification, large value capacitor 3 is filtered into direct current, offer the if inverter that IGBT single-phase full bridge assembly and intermediate-frequency transformer form, IGBT single-phase full bridge assembly consists of four high power switch element IGBT, under the control of drive circuit, four inverter bridge alternate conduction and shutoffs that IGBT forms, become the high pressure intermediate frequency square-wave voltage of 1KHz, through intermediate-frequency transformer step-down, again through super-high-current, the welding current of direct current output low-voltage, high-current after the full-wave rectification of low pressure drop power diode, the size of current welding current, stability can be effectively controlled by turning on and off of inverter bridge, and be directed at present medium frequency inverter electric resistance electric arc welder welding power source main loop, there is no suitable control device.
Summary of the invention
The object of the invention is to make up the deficiencies in the prior art, provide that a kind of precision is high, dependable performance, the constant-current control device for medium frequency inverter electric resistance electric arc welder welding power source main loop that cost is low.
The object of the invention is to be achieved through the following technical solutions: the constant-current control device of the medium frequency inverter electric resistance electric arc welder source of welding current, it comprises high-speed microprocessor, the elementary collecting unit of welding current, filter unit, IGBT driver element, comparator and the power subsystem of powering to single-chip microcomputer, on high-speed microprocessor, be provided with at least two signal input parts and four signal output parts, signal input part comprises analog input end and hardware interrupts end, IGBT driver element is comprised of at least four IGBT driver modules, after being connected with filter unit, the elementary collecting unit of welding current is provided with signal output part A and signal output part B, wherein, signal output part A is connected with the analog input end of high-speed microprocessor, signal output part B is connected with the input of comparator, the output output welding current TTL sequential square-wave signal of comparator is also connected with the hardware interrupts end of high-speed microprocessor, four signal output parts of high-speed microprocessor are connected with four IGBT driver modules respectively.
Described high-speed microprocessor adopts 80F330 high-speed microprocessor.
It is the Hall current sensor of 2 μ s that the elementary collecting unit of described welding current adopts maximum response time.
It is also provided with hot guard signal input, detection signal input and communication output unit; described hot guard signal input with by the hydraulic pressure switch hot guard signal synthetic with being contained in the intermediate-frequency transformer of medium frequency inverter resistance welded power supply and the temperature switch on IGBT single-phase full bridge assembly, be connected; detection signal input is connected with welding starting switch, and communication output unit comprises communication interface circuit and the output port of communicating by letter.
Described power subsystem comprises three terminal regulator, and its input power is+5V that out-put supply is+3.3V.
The hardware interrupts end of described high-speed microprocessor is set to be declined and triggered interruptive port by welding current TTL sequential square-wave signal level.
Four described IGBT driver modules are M57962AL, and are connected respectively in the base stage of four power switch components in IGBT single-phase full bridge formula assembly.
The signal output part of described high-speed microprocessor respectively and between IGBT driver module, be provided with and door buffer.
The constant current control method of medium frequency inverter resistance welded power supply, it comprises following steps:
(1), under the state of medium frequency inverter welding machine open loop, measure and calculate the I of IGBT under the pulse width condition between 50-480 μ s in inverter bridge
rMS/ I
mAXpercentage of current I%, and the formation with form is stored in high-speed microprocessor by this percentage of current, wherein, I
mAXfor IGBT conducting pulse width is the current value of 480 μ s, I
rMScurrent value during for pulse width between 50-480 μ s;
(2) welding starting switch is depressed, and high-speed microprocessor enters welding process, and electric current settings I is set
sET, and with an original width pulse t
1trigger IGBT single-phase full bridge formula assembly, at the bridge mid point of IGBT single-phase full bridge formula assembly, obtain an ac square-wave voltage, the secondary welding current that obtains of intermediate-frequency transformer;
(3) the elementary collecting unit of welding current gathers above-mentioned welding current, after filtering noise jamming signal, exports filter unit the analog signals of a 0-5V and the welding current TTL sequential square-wave signal of exporting once comparator, when the welding current TTL sequential square-wave signal of output causes high-speed microprocessor interruption, the analog signals of input is carried out to high-speed a/d conversion with 10 μ s intervals to high-speed microprocessor and storage obtains i
1, i
2, i
3i
ncurrent instantaneous value;
(4) when ac square-wave voltage end of output, then detect the welding current TTL sequential square-wave signal of exporting, measure the duration of weld interval, obtain the conduction angle of IGBT;
(5) to obtaining i
1, i
2, i
3i
ncurrent instantaneous value carry out after digital filtering, according to formula
calculate the real effective I of current welding current
rMS;
(6) according to the form in high-speed microprocessor, check in current percentage of current I%, by the real effective I of current welding current
rMS, electric current settings I
sETwith current percentage of current I%, calculate the percentage of current I% ' of next weld pulse, then according to current relationship table, try to achieve the conducting width t of next weld pulse
2;
(7) again with t
2conducting width regulation and control IGBT single-phase full bridge formula assembly, revise the actual current that flows through welding circuit, make actual current value effectively approach current value I is set
sET;
(8) repeating step (2)～(7), constantly adjust wide control by corrected current value to IGBT single-phase full bridge formula assembly, make actual current value effectively more approach current value I is set
sET.
The wide control of described tune adopts solid frequency modulation wide, and fixed frequency is 1000Hz.
The invention has the beneficial effects as follows: 80F330 high-speed microprocessor is applied in the control of inversion electric resistance welding, in welding process, adopted the constant current control technology of percentage of current formula, with the response time, be the Hall current sensor of 2 μ s to the maximum in the elementary collection welding current of intermediate-frequency transformer value, by 80F330 single-chip microcomputer, current signal real time high-speed A/D is changed again, every once also storage of 10 μ s conversions, and real effective floating point arithmetic goes out the virtual value of welding current, with settings relatively after, IGBT full-bridge is realized to pulsewidth regulation and control, a welding current of every 1MS regulation and control, constant current is controlled and reached optimum efficiency.The present invention has advantages of: 1, the hardware configuration of control device is more succinct than similar, and cost is low, controls function strong.2, can satisfy the demand precision resistance welding and have a large amount of solder joints to need energy-conservation occasion of control device, constant-current control accuracy is high≤and 3%, constant current compensation fast response time, every 1MS regulation and control are once.3, need to for every welding machine, on hardware, all not go to adjust it and control parameter, artificial factor on it without impact, on circuit board without any parameter that needs adjusting.4, control circuit board is general, changes the welding quality that circuit board does not affect the welding machine past, the maintenance of butt welding machine and manage useful.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of medium frequency inverter resistance welded power supply
Fig. 2 is the circuit diagram of constant-current control device of the present invention
Fig. 3 is the schematic diagram of power subsystem of the present invention
Wherein, 1-three-phase bridge rectifier, 2-discharge resistance, 3-large value capacitor, 4-IGBT single-phase full bridge assembly, 5-intermediate-frequency transformer, 6-high-speed microprocessor, the elementary collecting unit of 7-welding current, 8-filter unit, the 9-output unit of communicating by letter, 10-comparator, 11-power subsystem, 12-welds starting switch, 13-and door buffer, 14-communication interface circuit, the 15-output port of communicating by letter, 16-IGBT driver module A, 17-port A, 18-three terminal regulator, 19-IGBT driver module B, 20-port B, 21-IGBT driver module C, 22-port C, 23-IGBT driver module D, 24-port D, the hot guard signal of 25-.
The specific embodiment
Below in conjunction with accompanying drawing, further describe technical scheme of the present invention, but described in claimed scope is not limited to.
As Fig. 1, the ac grid voltage of three-phase 50Hz is through being input to three-phase bridge rectifier 1 rectification, large value capacitor 3 is filtered into direct current, offer the if inverter that IGBT single-phase full bridge assembly 4 and intermediate-frequency transformer 5 form, IGBT single-phase full bridge assembly 4 consists of four high power switch element IGBT, under the control of drive circuit, four inverter bridge alternate conduction and shutoffs that IGBT forms, become the high pressure intermediate frequency square-wave voltage of 1KHz, through intermediate-frequency transformer 5 step-downs, again through super-high-current, the welding current of direct current output low-voltage, high-current after the full-wave rectification of low pressure drop power diode, the size of current welding current, stability can be effectively controlled by turning on and off of inverter bridge, wherein 2 is discharge resistance, after welding machine shutdown, a discharge loop is provided to large value capacitor 3, DC high-voltage on large value capacitor 3 is bled off, safety with protection maintenance personal.
As Fig. 2, the constant-current control device of the medium frequency inverter electric resistance electric arc welder source of welding current, it comprises high-speed microprocessor 6, the elementary collecting unit 7 of welding current, filter unit 8, IGBT driver element, comparator 10 and the power subsystem 11 of powering to single-chip microcomputer, on high-speed microprocessor 6, be provided with two signal input parts and four signal output parts, signal input part comprises analog input end and hardware interrupts end, IGBT driver element is comprised of four IGBT driver modules, after being connected with filter unit 8, the elementary collecting unit 7 of welding current is provided with signal output part A and signal output part B, wherein, signal output part A is connected with the analog input end of high-speed microprocessor 6, signal output part B is connected with the input of comparator 10, the output output welding current TTL sequential square-wave signal of comparator 10 is also connected with the hardware interrupts end of high-speed microprocessor 6, four signal output parts of high-speed microprocessor 6 are connected with four IGBT driver modules respectively.
Described high-speed microprocessor 6 adopts 80F330 high-speed microprocessor.
It is the Hall current sensor of 2 μ s that the elementary collecting unit 7 of described welding current adopts maximum response time.
It is also provided with hot guard signal input, detection signal input and communication output unit 9, described hot guard signal input with by the hydraulic pressure switch hot guard signal 25 synthetic with being contained in the intermediate-frequency transformer 5 of medium frequency inverter resistance welded power supply and the temperature switch on IGBT single-phase full bridge assembly 4, be connected, detection signal input is connected with welding starting switch 12, communication output unit 9 comprises communication interface circuit 14 and the output port 15 of communicating by letter, whether single-chip microcomputer 6 both can have been judged welding starting switch 12 by the voltage of detection input and depress, simultaneously in welding process, single-chip microcomputer 6 is by the duty of judgement hydraulic pressure switch and temperature switch, as improper, sending of IGBT pulse will be forbidden, stop welding.
As Fig. 3, described power subsystem 11 comprises three terminal regulator 18, and its input power is+5V that out-put supply is+3.3V, for control circuit provides power supply.
The hardware interrupts end of described high-speed microprocessor 6 is set to be declined and triggered interruptive port by welding current TTL sequential square-wave signal level.
Four described IGBT driver modules are M57962AL, and be connected respectively in the base stage of four power switch components in IGBT single-phase full bridge formula assembly, as IGBT driver module A16 output drive signal is received in the base stage of the T1 power switch component in IGBT single-phase full bridge formula assembly 4 by port A17, IGBT driver module B19 output drive signal is received in the base stage of the T2 power switch component in IGBT single-phase full bridge formula assembly 4 by port B20, IGBT driver module C21 output drive signal is received in the base stage of the T3 power switch component in IGBT single-phase full bridge formula assembly 4 by port C22, IGBT driver module D23 output drive signal is received in the base stage of the T4 power switch component in IGBT single-phase full bridge formula assembly 4 by port D24.
The signal output part of described high-speed microprocessor 6 respectively and between IGBT driver module, be provided with and door buffer 13.
The constant current control method of medium frequency inverter resistance welded power supply, it comprises following steps:
(1), under the state of medium frequency inverter welding machine open loop, measure and calculate the I of IGBT under the pulse width condition between 50-480 μ s in inverter bridge
rMS/ I
mAXpercentage of current I%, and the formation with form is stored in high-speed microprocessor by this percentage of current, wherein, I
mAXfor IGBT conducting pulse width is the current value of 480 μ s, I
rMScurrent value during for pulse width between 50-480 μ s;
(2) welding starting switch is depressed, and high-speed microprocessor enters welding process, and electric current settings I is set
sET, and with an original width pulse t
1: 100 μ s trigger IGBT single-phase full bridge formula assembly, carry out in such a way: drive T1, the T4 conducting simultaneously in IGBT single-phase full bridge assembly 4, T2, T3 turn-off 180 ° simultaneously, and then T2, the T3 conducting simultaneously in driving IGBT single-phase full bridge assembly 4, T1, T4 turn-off 180 ° simultaneously, so circulation, obtains an ac square-wave voltage, the secondary welding current that obtains of intermediate-frequency transformer at the bridge mid point of IGBT single-phase full bridge formula assembly;
(3) the elementary collecting unit of welding current gathers above-mentioned welding current, after filtering noise jamming signal, exports filter unit the analog signals of a 0-5V and the welding current TTL sequential square-wave signal of exporting once comparator, when the welding current TTL sequential square-wave signal of output causes high-speed microprocessor interruption, the analog signals of input is carried out to high-speed a/d conversion with 10 μ s intervals to high-speed microprocessor and storage obtains i
1, i
2, i
3i
ncurrent instantaneous value;
(4) when ac square-wave voltage end of output, then detect the welding current TTL sequential square-wave signal of exporting, measure the duration of weld interval, obtain the conduction angle of IGBT;
(5) to obtaining i
1, i
2, i
3i
ncurrent instantaneous value carry out after digital filtering, according to formula
calculate the real effective I of current welding current
rMS;
(6) according to the form in high-speed microprocessor, check in current percentage of current I%, by the real effective I of current welding current
rMS, electric current settings I
sETwith current percentage of current I%, calculate the percentage of current I% ' of next weld pulse, then according to current relationship table, try to achieve the conducting width t of next weld pulse
2;
(7) again with t
2conducting width regulation and control IGBT single-phase full bridge formula assembly, revise the actual current that flows through welding circuit, make actual current value effectively approach current value I is set
sET;
(8) repeating step (2)～(7), constantly adjust wide control by corrected current value to IGBT single-phase full bridge formula assembly, make actual current value effectively more approach current value I is set
sET.
The wide control of described tune adopts solid frequency modulation wide, and fixed frequency is 1000Hz.
Claims (9)
1. the constant-current control device of the medium frequency inverter electric resistance electric arc welder source of welding current, it is characterized in that: it comprises high-speed microprocessor (6), the elementary collecting unit of welding current (7), filter unit (8), IGBT driver element, comparator (10) and the power subsystem (11) of powering to single-chip microcomputer, on high-speed microprocessor (6), be provided with at least two signal input parts and four signal output parts, signal input part comprises analog input end and hardware interrupts end, IGBT driver element is comprised of at least four IGBT driver modules, the elementary collecting unit of welding current (7) is provided with signal output part A and signal output part B after being connected with filter unit (8), wherein, signal output part A is connected with the analog input end of high-speed microprocessor (6), signal output part B is connected with the input of comparator (10), the output output welding current TTL sequential square-wave signal of comparator (10) is also connected with the hardware interrupts end of high-speed microprocessor (6), four signal output parts of high-speed microprocessor (6) are connected with four IGBT driver modules respectively.
2. the constant-current control device of the medium frequency inverter electric resistance electric arc welder source of welding current according to claim 1, is characterized in that: it is the Hall current sensor of 2 μ s that the elementary collecting unit of described welding current (7) adopts maximum response time.
3. the constant-current control device of the medium frequency inverter electric resistance electric arc welder source of welding current according to claim 1, it is characterized in that: it is also provided with hot guard signal input, detection signal input and communication output unit (9), described hot guard signal input with by the hydraulic pressure switch hot guard signal (25) synthetic with being contained in the intermediate-frequency transformer (5) of medium frequency inverter resistance welded power supply and the temperature switch on IGBT single-phase full bridge assembly (4), be connected, detection signal input is connected with welding starting switch (12), communication output unit (9) comprises communication interface circuit (14) and the output port of communicating by letter (15).
4. the constant-current control device of the medium frequency inverter electric resistance electric arc welder source of welding current according to claim 1, is characterized in that: described power subsystem (11) comprises three terminal regulator (18), and its input power is+5V that out-put supply is+3.3V.
5. the constant-current control device of the medium frequency inverter electric resistance electric arc welder source of welding current according to claim 1, is characterized in that: the hardware interrupts end of described high-speed microprocessor (6) is set to be declined and triggered interruptive port by welding current TTL sequential square-wave signal level.
6. the constant-current control device of the medium frequency inverter electric resistance electric arc welder source of welding current according to claim 1, it is characterized in that: four described IGBT driver modules are M57962AL, and are connected respectively in the base stage of four power switch components in IGBT single-phase full bridge formula assembly (4).
7. the constant-current control device of the medium frequency inverter electric resistance electric arc welder source of welding current according to claim 1, is characterized in that: the signal output part of described high-speed microprocessor (6) respectively and between IGBT driver module, be provided with and door buffer (13).
8. the constant current control method of medium frequency inverter resistance welded power supply, is characterized in that: it comprises following steps:
(1), under the state of medium frequency inverter welding machine open loop, measure and calculate the I of IGBT under the pulse width condition between 50-480 μ s in inverter bridge
rMS/ I
mAXpercentage of current I%, and the formation with form is stored in high-speed microprocessor by this percentage of current, wherein, I
mAXfor IGBT conducting pulse width is the current value of 480 μ s, I
rMScurrent value during for pulse width between 50-480 μ s;
(2) welding starting switch is depressed, and high-speed microprocessor enters welding process, and electric current settings I is set
sET, and with an original width pulse t
1trigger IGBT single-phase full bridge formula assembly, at the bridge mid point of IGBT single-phase full bridge formula assembly, obtain an ac square-wave voltage, the secondary welding current that obtains of intermediate-frequency transformer;
(3) the elementary collecting unit of welding current gathers above-mentioned welding current, after filtering noise jamming signal, exports filter unit the analog signals of a 0-5V and the welding current TTL sequential square-wave signal of exporting once comparator, when the welding current TTL sequential square-wave signal of output causes high-speed microprocessor interruption, the analog signals of input is carried out to high-speed a/d conversion with 10 μ s intervals to high-speed microprocessor and storage obtains i
1, i
2, i
3i
ncurrent instantaneous value;
(4) when ac square-wave voltage end of output, then detect the welding current TTL sequential square-wave signal of exporting, measure the duration of weld interval, obtain the conduction angle of IGBT;
(5) to obtaining i
1, i
2, i
3i
ncurrent instantaneous value carry out after digital filtering, according to formula
calculate the real effective I of current welding current
rMS;
(6) according to the form in high-speed microprocessor, check in current percentage of current I%, by the real effective I of current welding current
rMS, electric current settings I
sETwith current percentage of current I%, calculate the percentage of current I% ' of next weld pulse, then according to current relationship table, try to achieve the conducting width t of next weld pulse
2;
(7) again with t
2conducting width regulation and control IGBT single-phase full bridge formula assembly, revise the actual current that flows through welding circuit, make actual current value effectively approach current value I is set
sET;
(8) repeating step (2)～(7), constantly adjust wide control by corrected current value to IGBT single-phase full bridge formula assembly, make actual current value effectively more approach current value I is set
sET.
9. the constant current control method of medium frequency inverter resistance welded power supply according to claim 8, is characterized in that: the wide control of described tune adopts solid frequency modulation wide, and fixed frequency is 1000Hz.
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| CN103934562B (en) * | 2014-04-23 | 2016-05-25 | 武汉大学 | The micro-connection special power-supply system of a kind of filament |
| CN107717199A (en) * | 2017-10-31 | 2018-02-23 | 天津七所高科技有限公司 | A kind of medium frequency inverter electric resistance welding inverter constant current control method |
| CN108563191B (en) * | 2018-03-30 | 2023-08-04 | 南京绥德自动焊接装备有限公司 | Programmer for medium-frequency inversion resistance welding system and working method thereof |
| CN109093239B (en) * | 2018-11-07 | 2023-09-26 | 中正智控（江苏）智能科技有限公司 | Medium frequency inversion resistance welding controller and constant current control method thereof |
| CN109317804B (en) * | 2018-12-07 | 2023-09-26 | 中正智控（江苏）智能科技有限公司 | Control device and control method for medium-frequency inverter resistance welder combined with PLC |
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| CN201415310Y (en) * | 2009-06-30 | 2010-03-03 | 上海沪工电焊机制造有限公司 | Precision spot welder |
| CN102259233A (en) * | 2011-07-29 | 2011-11-30 | 广州市精源电子设备有限公司 | Intermediate-frequency inverter-resistance spot welding power-supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201415310Y (en) * | 2009-06-30 | 2010-03-03 | 上海沪工电焊机制造有限公司 | Precision spot welder |
| CN102259233A (en) * | 2011-07-29 | 2011-11-30 | 广州市精源电子设备有限公司 | Intermediate-frequency inverter-resistance spot welding power-supply system |
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