CN102554441A - 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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- CN102554441A CN102554441A CN2011103978718A CN201110397871A CN102554441A CN 102554441 A CN102554441 A CN 102554441A CN 2011103978718 A CN2011103978718 A CN 2011103978718A CN 201110397871 A CN201110397871 A CN 201110397871A CN 102554441 A CN102554441 A CN 102554441A
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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 and control method thereof of the medium frequency inverter resistance welder source of welding current.
Background technology
Electric resistance welding is one of main welding method, uses very extensive in commercial production fields such as Aeronautics and Astronautics, automobile, engineering machinery; Resistance welder mainly is divided into single phase industrial frequence interchange, phase secondary rectification, capacitor discharge welding, medium frequency inverter weldering etc. by the form of its source of welding current.Wherein, the medium frequency inverter electric resistance welding can realize the welding of the precise treatment of weldment, meets the new demand that new material, development of new techniques propose welding, and is this efficient, light and handy, and the energy-conservation novel source of welding current is the developing direction of resistance welding power source from now on.
The medium frequency inverter electric resistance welding has the advantages that the electrical network three-phase is balanced, power factor is high, energy savings consumes.Reverse frequency is 1KHZ, and welding current secondary commutation output, constant current control, the adjustment of welding current are the intermediate frequency adjustment of per second 1000 times, are 1/20 of traditional SCR type resistance control, and control accuracy is high, and heating current density is big.Through practical application, it has the parameter adjustability of broad and the process advantage of 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 inverter resistance welder with high content of technology; The research and the commercialization of the inversion weldering that (mainly refers to the U.S., Japan, Germany) abroad are quite ripe, have successively released the inverter type resistance welding machine product, have got into practical stage widely.A lot of companies can produce accurate inverter resistance welder and supporting intermediate frequency welding transformer, and at home, and in recent years, the inversion resistance welding technology was also applied beginning; Abroad, in the domestic inversion weldering control, reverse frequency is between 1K～4K, wherein major part is 1K.
The quality control method of resistance welded: mainly contain constant voltage control, constant current control, permanent power control.But; In the constant voltage control mode welding process, the Current Control precision is relatively poor, and the stability of welding quality is not fine; Permanent power control can guarantee welding quality well; But the requirement to controller technology is high, like detection technique and control technology etc., uses seldom in the business-like at home and abroad electrical resistance weld controller; Prove in the long-term practice; 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 at uses the most extensively in the quality of resistance welds both domestic and external monitoring, but when concrete enforcement, then have the height of level technically, shows on constant-current control accuracy and the current compensation response speed; The intermediate frequency resistance welder 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 control more; Complicated circuit also makes its control system want much complicated with respect to common AC resistance welding machine, and the back maintenance difficult is out of order.
Resistance welding power source is because power output is big; So the major loop of its source of welding current nearly all is following circuit structure: the ac grid voltage of three-phase 50Hz is through being input to the 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 are formed, IGBT single-phase full bridge assembly is made up 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 1K Hz, through the intermediate-frequency transformer step-down, the welding current of direct current output low-voltage, high-current after excessive electric current, the full-wave rectification of low pressure drop power diode again; Size, the stability of welding current can be effectively controlled through turning on and off of inverter bridge at present, do not have the appropriate control device and be directed to medium frequency inverter resistance electric welding machine welding power source main loop at present.
Summary of the invention
The objective of the invention is to remedy the deficiency of prior art, a kind of precision height, dependable performance are provided, the constant-current control device that cost is low to medium frequency inverter resistance electric welding machine welding power source main loop.
The objective of the invention is to realize: the constant-current control device of the medium frequency inverter resistance electric welding machine source of welding current through following technical scheme; It comprises high-speed microprocessor, the elementary collecting unit of welding current, filter unit, IGBT driver element, comparator and the power subsystem of supplying power to single-chip microcomputer; High-speed microprocessor is provided with at least two signal input parts and four signal output parts; Signal input part comprises analog quantity input and hardware interrupts end; The IGBT driver element is made up of at least four IGBT driver modules, the elementary collecting unit of welding current be provided with signal output part A and signal output part B after filter unit is connected, wherein; Signal output part A is connected with the analog quantity input of high-speed microprocessor; Signal output part B is connected with the input of comparator, and the output of comparator is exported welding current TTL sequential square-wave signal and is connected with the hardware interrupts end of high-speed microprocessor, and four signal output parts of high-speed microprocessor are connected with four IGBT driver modules respectively.
Described high-speed microprocessor adopts the 80F330 high-speed microprocessor.
It is the Hall current sensor of 2US that the elementary collecting unit of described welding current adopts maximum response time.
It also is provided with hot guard signal input, detection signal input and communication output unit; Described hot guard signal input be connected by the synthetic hot guard signal of the temperature switch on hydraulic pressure switch and intermediate-frequency transformer that is contained in medium frequency inverter resistance welded power supply and the IGBT single-phase full bridge assembly; The detection signal input is connected with the welding starting switch, and the communication output unit comprises the communication interface circuit and the output port of communicating by letter.
Described power subsystem comprises three terminal regulator, and its input power supply is+5V that the input power supply is+3.3V.
The hardware interrupts end of described high-speed microprocessor is set to trigger interruptive port by the decline of welding current TTL sequential square-wave signal level.
Described four IGBT driver modules are M57962AL, and are connected respectively on the base stage of four power switch components in the IGBT single-phase full bridge formula assembly.
The signal output part of described high-speed microprocessor respectively and be provided with between the IGBT driver module with the door buffer.
The constant current control method of medium frequency inverter resistance welded power supply, it comprises following steps:
A. under the state of medium frequency inverter welding machine open loop, measure and calculate the I of IGBT under the pulse width condition between the 50-480US in the inverter bridge
RMS/ I
MAXPercentage of current I%, and the formation of this percentage of current with form is stored in the high-speed microprocessor, wherein, I
MAXFor IGBT conducting pulse width is the current value of 480US, I
RMSCurrent value during for the pulse width between the 50-480US;
B. weld starting switch and depress, high-speed microprocessor gets into 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, obtain 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;
C. the elementary collecting unit of welding current is gathered above-mentioned welding current;, exports filter unit the analog signals of a 0-5V and the welding current TTL sequential square-wave signal of exporting once comparator after filtering the noise jamming signal; When the welding current TTL sequential square-wave signal of output caused the high-speed microprocessor interruption, the analog signals of importing is carried out the high-speed a/d conversion with 10us to high-speed microprocessor at interval and storage obtains i
1, i
2, i
3... i
nCurrent instantaneous value;
D. when the ac square-wave voltage end of output, detect the welding current TTL sequential square-wave signal of output again, measure the duration of weld interval, obtain the conduction angle of IGBT;
E. to obtaining i
1, i
2, i
3... i
nCurrent instantaneous value carry out digital filtering after, according to formula
Calculate the real effective I of current welding current
RMS
F. check in current percentage of current I% according to the form in the high-speed microprocessor, 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, try to achieve the conducting width t of next weld pulse again according to the current relationship table
2
G. 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 near current value I is set
SET
H. repeating step B～G constantly transfers wide control with corrected current value to IGBT single-phase full bridge formula assembly, makes actual current value effectively more near current value I is set
SET
It is wide that the wide control of described accent adopts solid frequency to transfer, and fixed frequency is 1000Hz.
The invention has the beneficial effects as follows: the 80F330 high-speed microprocessor is applied in welding process, adopt the constant current control technology of percentage of current formula in the control of inversion electric resistance welding; The Hall current sensor that is 2US with the response time to the maximum is in the elementary collection welding current of intermediate-frequency transformer value; Through the 80F330 single-chip microcomputer current signal real time high-speed A/D is changed, every separated 10US changes once and stores, and the real effective floating point arithmetic goes out the virtual value of welding current again; With settings relatively after; The IGBT full-bridge is realized the pulsewidth regulation and control, and welding current of every 1MS regulation and control makes constant current control reach optimum efficiency.The advantage that the present invention had: 1, the hardware configuration of control device is more succinct than similar, and cost is low, and the control function is 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 response speed is fast, and every 1MS regulation and control are once.3, need on hardware, all not go to adjust its control parameter to every welding machine, artificial factor does not have influence to it, the no any parameter that need regulate on the circuit board.4, control circuit board is general, changes the welding quality that circuit board does not influence the welding machine past, the maintenance of butt welding machine and manage useful.
Description of drawings
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 sketch map 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, the 10-comparator; The 11-power subsystem, 12-welds starting switch, 13-and a 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
Further describe technical scheme of the present invention below in conjunction with accompanying drawing, but require the scope of protection to be not limited to said.
Like Fig. 1, the ac grid voltage of three-phase 50Hz is through being input to three-phase bridge rectifier 1 rectification, and large value capacitor 3 is filtered into direct current; Offer the if inverter of IGBT single-phase full bridge assembly 4 and intermediate-frequency transformer 5 compositions; IGBT single-phase full bridge assembly 4 is made up of four high power switch element IGBT, under the control of drive circuit, and four inverter bridge alternate conduction and shutoffs that IGBT forms; Become the high pressure intermediate frequency square-wave voltage of 1K Hz; Through intermediate-frequency transformer 5 step-downs, the welding current of direct current output low-voltage, high-current after excessive electric current, the full-wave rectification of low pressure drop power diode again, size, the stability of welding current can be effectively controlled through turning on and off of inverter bridge at present; Wherein 2 is discharge resistance; After the welding machine shutdown, a discharge loop is provided for large value capacitor 3, the dc high-voltage on the large value capacitor 3 is bled off, with protection maintenance personal's safety.
Like Fig. 2; The constant-current control device of the medium frequency inverter resistance electric welding machine source of welding current; It comprises the elementary collecting unit of high-speed microprocessor 6, welding current 7, filter unit 8, IGBT driver element, comparator 10 and to the power subsystem 11 of single-chip microcomputer power supply; High-speed microprocessor 6 is provided with two signal input parts and four signal output parts, and signal input part comprises analog quantity input and hardware interrupts end, and the IGBT driver element is made up of four IGBT driver modules; The elementary collecting unit 7 of welding current be provided with signal output part A and signal output part B after filter unit 8 is connected; Wherein, signal output part A is connected with the analog quantity input of high-speed microprocessor 6, and signal output part B is connected with the input of comparator 10; The output of comparator 10 is exported welding current TTL sequential square-wave signal and is connected with the hardware interrupts end of high-speed microprocessor 6, and four signal output parts of high-speed microprocessor 6 are connected with four IGBT driver modules respectively.
Described high-speed microprocessor 6 adopts the 80F330 high-speed microprocessor.
It is the Hall current sensor of 2US that the elementary collecting unit 7 of described welding current adopts maximum response time.
It also is provided with hot guard signal input, detection signal input and communication output unit 9; Described hot guard signal input be connected by the synthetic hot guard signal 25 of the temperature switch on hydraulic pressure switch and intermediate-frequency transformer 5 that is contained in medium frequency inverter resistance welded power supply and the IGBT single-phase full bridge assembly 4; The detection signal input is connected with welding starting switch 12; Communication output unit 9 comprises the communication interface circuit 14 and the output port 15 of communicating by letter, and whether single-chip microcomputer 6 both can have been judged welding starting switch 12 through the voltage that detects input and depress, simultaneously in welding process; Single-chip microcomputer 6 will be judged the duty of hydraulic pressure switch and temperature switch; As improper, then will forbid sending of IGBT pulse, stop welding.
Like Fig. 3, described power subsystem 11 comprises three terminal regulator 18, and its input power supply is+5V that the input power supply is+3.3V, for control circuit provides power supply.
The hardware interrupts end of described high-speed microprocessor 6 is set to trigger interruptive port by the decline of welding current TTL sequential square-wave signal level.
Described four IGBT driver modules are M57962AL; And be connected respectively on the base stage of four power switch components in the IGBT single-phase full bridge formula assembly; Receive on the base stage of the T1 power switch component in the IGBT single-phase full bridge formula assembly 4 through port A17 like IGBT driver module A16 output drive signal; IGBT driver module B19 output drive signal is received on the base stage of the T2 power switch component in the IGBT single-phase full bridge formula assembly 4 through port B20; IGBT driver module C21 output drive signal is received through port C22 on the base stage of the T3 power switch component in the IGBT single-phase full bridge formula assembly 4, and IGBT driver module D23 output drive signal is received on the base stage of the T4 power switch component in the IGBT single-phase full bridge formula assembly 4 through port D24.
The signal output part of described high-speed microprocessor 6 respectively and be provided with between the IGBT driver module with the door buffer 13.
The constant current control method of medium frequency inverter resistance welded power supply, it comprises following steps:
A. under the state of medium frequency inverter welding machine open loop, measure and calculate the I of IGBT under the pulse width condition between the 50-480US in the inverter bridge
RMS/ I
MAXPercentage of current I%, and the formation of this percentage of current with form is stored in the high-speed microprocessor, wherein, I
MAXFor IGBT conducting pulse width is the current value of 480US, I
RMSCurrent value during for the pulse width between the 50-480US;
B. weld starting switch and depress, high-speed microprocessor gets into welding process, and electric current settings I is set
SET, and with an original width pulse t
1: 100US triggers IGBT single-phase full bridge formula assembly; Carry out in such a way: drive T1, T4 conducting simultaneously in the IGBT single-phase full bridge assembly 4, T2, T3 turn-off 180 ° simultaneously, and then drive T2, T3 conducting simultaneously in the 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;
C. the elementary collecting unit of welding current is gathered above-mentioned welding current;, exports filter unit the analog signals of a 0-5V and the welding current TTL sequential square-wave signal of exporting once comparator after filtering the noise jamming signal; When the welding current TTL sequential square-wave signal of output caused the high-speed microprocessor interruption, the analog signals of importing is carried out the high-speed a/d conversion with 10us to high-speed microprocessor at interval and storage obtains i
1, i
2, i
3... i
nCurrent instantaneous value;
D. when the ac square-wave voltage end of output, detect the welding current TTL sequential square-wave signal of output again, measure the duration of weld interval, obtain the conduction angle of IGBT;
E. to obtaining i
1, i
2, i
3... i
nCurrent instantaneous value carry out digital filtering after, according to formula
Calculate the real effective I of current welding current
RMS
F. check in current percentage of current I% according to the form in the high-speed microprocessor, 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, try to achieve the conducting width t of next weld pulse again according to the current relationship table
2
G. 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 near current value I is set
SET
H. repeating step B～G constantly transfers wide control with corrected current value to IGBT single-phase full bridge formula assembly, makes actual current value effectively more near current value I is set
SET
It is wide that the wide control of described accent adopts solid frequency to transfer, and fixed frequency is 1000Hz.
Claims (10)
1. the constant-current control device of the medium frequency inverter resistance electric welding machine 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 supplying power to single-chip microcomputer; High-speed microprocessor (6) is provided with at least two signal input parts and four signal output parts; Signal input part comprises analog quantity input and hardware interrupts end; The IGBT driver element is made up of at least four IGBT driver modules, the elementary collecting unit of welding current (7) be provided with signal output part A and signal output part B after filter unit (8) is connected, wherein; Signal output part A is connected with the analog quantity input of high-speed microprocessor (6); Signal output part B is connected with the input of comparator (10), and the output of comparator (10) is exported welding current TTL sequential square-wave signal and is connected with the hardware interrupts end of high-speed microprocessor (6), and 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 resistance electric welding machine source of welding current according to claim 1 is characterized in that: described high-speed microprocessor (6) adopts the 80F330 high-speed microprocessor.
3. the constant-current control device of the medium frequency inverter resistance electric welding machine source of welding current according to claim 1 is characterized in that: it is the Hall current sensor of 2US that the elementary collecting unit of described welding current (7) adopts maximum response time.
4. the constant-current control device of the medium frequency inverter resistance electric welding machine source of welding current according to claim 1; It is characterized in that: it also is provided with hot guard signal input, detection signal input and communication output unit (9); Described hot guard signal input be connected by the synthetic hot guard signal (25) of the temperature switch on hydraulic pressure switch and intermediate-frequency transformer that is contained in medium frequency inverter resistance welded power supply (5) and the IGBT single-phase full bridge assembly (4); The detection signal input is connected with welding starting switch (12), and communication output unit (9) comprises communication interface circuit (14) and the output port of communicating by letter (15).
5. the constant-current control device of the medium frequency inverter resistance electric welding machine 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 supply is+5V that the input power supply is+3.3V.
6. the constant-current control device of the medium frequency inverter resistance electric welding machine 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 trigger interruptive port by the decline of welding current TTL sequential square-wave signal level.
7. the constant-current control device of the medium frequency inverter resistance electric welding machine source of welding current according to claim 1; It is characterized in that: described four IGBT driver modules are M57962AL, and are connected respectively on the base stage of four power switch components in the IGBT single-phase full bridge formula assembly (4).
8. the constant-current control device of the medium frequency inverter resistance electric welding machine source of welding current according to claim 1 is characterized in that: the signal output part of described high-speed microprocessor (6) respectively and be provided with between the IGBT driver module with the door buffer (13).
9. the constant current control method of medium frequency inverter resistance welded power supply, it is characterized in that: it comprises following steps:
A. under the state of medium frequency inverter welding machine open loop, measure and calculate the I of IGBT under the pulse width condition between the 50-480US in the inverter bridge
RMS/ I
MAXPercentage of current I%, and the formation of this percentage of current with form is stored in the high-speed microprocessor, wherein, I
MAXFor IGBT conducting pulse width is the current value of 480US, I
RMSCurrent value during for the pulse width between the 50-480US;
B. weld starting switch and depress, high-speed microprocessor gets into 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, obtain 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;
C. the elementary collecting unit of welding current is gathered above-mentioned welding current;, exports filter unit the analog signals of a 0-5V and the welding current TTL sequential square-wave signal of exporting once comparator after filtering the noise jamming signal; When the welding current TTL sequential square-wave signal of output caused the high-speed microprocessor interruption, the analog signals of importing is carried out the high-speed a/d conversion with 10us to high-speed microprocessor at interval and storage obtains i
1, i
2, i
3... i
nCurrent instantaneous value;
D. when the ac square-wave voltage end of output, detect the welding current TTL sequential square-wave signal of output again, measure the duration of weld interval, obtain the conduction angle of IGBT;
E. to obtaining i
1, i
2, i
3... i
nCurrent instantaneous value carry out digital filtering after, according to formula
Calculate the real effective I of current welding current
RMS
F. check in current percentage of current I% according to the form in the high-speed microprocessor, 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, try to achieve the conducting width t of next weld pulse again according to the current relationship table
2
G. 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 near current value I is set
SET
H. repeating step B～G constantly transfers wide control with corrected current value to IGBT single-phase full bridge formula assembly, makes actual current value effectively more near current value I is set
SET
10. the constant current control method of medium frequency inverter resistance welded power supply according to claim 9 is characterized in that: it is wide that the wide control of described accent adopts solid frequency to transfer, and fixed frequency is 1000Hz.
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|---|---|---|---|---|
| CN103934562A (en) * | 2014-04-23 | 2014-07-23 | 武汉大学 | Special power system for filament micro connection |
| 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 |
| CN108563191A (en) * | 2018-03-30 | 2018-09-21 | 南京绥德自动焊接装备有限公司 | Programmable device and its working method for medium frequency inverter electric resistance welding system |
| CN109093239A (en) * | 2018-11-07 | 2018-12-28 | 中正智控（江苏）智能科技有限公司 | Medium frequency inverter electrical resistance weld controller and its constant current control method |
| CN109317804A (en) * | 2018-12-07 | 2019-02-12 | 中正智控（江苏）智能科技有限公司 | In conjunction with the medium-frequency inverting resistance welding machine control device and control method of PLC |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103934562A (en) * | 2014-04-23 | 2014-07-23 | 武汉大学 | Special power system for filament micro connection |
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| CN108563191A (en) * | 2018-03-30 | 2018-09-21 | 南京绥德自动焊接装备有限公司 | Programmable device and its working method for medium frequency inverter electric resistance welding system |
| CN109093239A (en) * | 2018-11-07 | 2018-12-28 | 中正智控（江苏）智能科技有限公司 | Medium frequency inverter electrical resistance weld controller and its constant current control method |
| 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 |
| CN109317804A (en) * | 2018-12-07 | 2019-02-12 | 中正智控（江苏）智能科技有限公司 | In conjunction with the medium-frequency inverting resistance welding machine control device and control method of PLC |
| 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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