CN202894546U - Wide-voltage-input electric welder circuit based on single-phase power-factor correction technology - Google Patents
Wide-voltage-input electric welder circuit based on single-phase power-factor correction technology Download PDFInfo
- Publication number
- CN202894546U CN202894546U CN 201220651118 CN201220651118U CN202894546U CN 202894546 U CN202894546 U CN 202894546U CN 201220651118 CN201220651118 CN 201220651118 CN 201220651118 U CN201220651118 U CN 201220651118U CN 202894546 U CN202894546 U CN 202894546U
- Authority
- CN
- China
- Prior art keywords
- circuit
- capacitor
- welding machine
- rectification
- switching tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Generation Of Surge Voltage And Current (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
The utility model discloses a wide-voltage-input electric welder circuit based on a single-phase power-factor correction technology, relating to an electric welder circuit. The wide-voltage-input electric welder circuit comprises a power conversion circuit and an electric welder control unit, wherein the power conversion circuit comprises a rectifying circuit, a direct-current chopping conversion circuit, a half-bridge isolation conversion circuit and a high-frequency rectifying circuit. Due to the adoption of a high-frequency and soft-switching technology, the electric welder has the advantages of small size, light weight, high efficiency, high power factor, small influence to a power grid and the like. The intelligent and high-quality welding of the electric welder is realized, and the wide-voltage-input electric welder circuit can normally work within the voltage range of 85Vac-264Vac, can meet the requirement of a high-power-factor inverter type direct-current electric welder which is applied globally, can automatically realize welding processes capable of meeting the requirements of different working conditions, and has a complete protection function and a fault alarming and processing function.
Description
Technical field
The utility model relates to a kind of electric welding machine circuit, particularly a kind of wide voltage input electric welding machine circuit of single-phase power factor correcting technology.
Background technology
Since the reform and opening-up, the national economy rapid growth, " scientific and technical innovation, autonomous innovation " become the main flow of present domestic industry development, and China's industry is just progressively to the future development of intensive style, energy-saving and emission-reduction, low-carbon (LC).Electric welding machine is low voltage equipment commonly used in building, manufacturing, the mechanical processing industry, and it is widely used as welding jig indispensable in the industrial production.Along with the process of industrial expansion and internationalizationof of market, China's electric welding machine is accepted by numerous countries.The operation principle of welding transformer is similar to transformer, it is a step-down transformer, the two ends of its primary coil are connected with AC power, the two ends of its secondary coil are welded part and the welding rod that is clipped on the welding clamp, by the electric arc that between welded part and welding rod, ignites, the high temperature that utilizes electric arc is fused into the slit of workpiece and welding rod and is integrated, and realizes welding.At present, the IGBT direct-current inverter welding machine is widely used, and its good electric property and significant energy-saving effect have all obtained sufficient embodiment in various capital construction industries.The most of PWM technology that adopts of China IGBT direct-current inverter welding machine by the SG3525PWM control integration circuit of specialty, is regulated the dutycycle of IGBT power switch pipe, thereby is reached the adjusting of output current size.Existing electric welding machine mainly is made of the cable of shell, welding transformer and its input, output wiring terminal and connection electrode holders and welding machine, usually on the former limit of welding transformer different coil taps is set, above-mentioned tap is caused the binding post that is arranged on the shell of electric welding machine, to adapt to different operating voltages.According to the investigation statistics, the electric welding machine of single-phase 85Vac-264Vac scope input voltage can satisfy the requirement of whole world power supply fully, but the electric welding machine of producing at present all can not satisfy the application of this range of voltages fully.The technical staff of R﹠D institution and enterprise is constantly exploring, is studying, wish to develop a kind of electric welding machine of superior performance, to satisfy the requirement of High Power Factor and wide-range input voltage, although make some progress, in practice, still exist the technical barrier that not yet overcomes.
Summary of the invention
The purpose of this utility model is to overcome above deficiency, a kind of wide voltage input electric welding machine circuit of single-phase power factor correcting technology is provided, this circuit adopts high frequency technique, soft switch technique and digital control technology, can in the 85Vac-264Vac voltage range, work, satisfy the requirement of High Power Factor and wide-range input voltage, realize intellectuality, the high-quality welding of electric welding machine.
The technical scheme that its technical problem that solves the utility model adopts is: comprise power conversion circuit and electric welding machine control module, described power conversion circuit comprises rectification circuit, the DC chopped-wave translation circuit, half-bridge isolated variable circuit, high-frequency rectification circuit, described rectification circuit is uncontrollable rectification circuit, this circuit is by input switch QF1, electromagnetic interface filter, resistance R 1 powers on, the relay R that powers on Y1, upper relay control unit, and rectification module BRI consists of, described rectification module BRI is single-phase uncontrollable rectification module, electromagnetic interface filter input termination capacitor C 1, output termination capacitor C 2, and by capacitor C 3, C4 ground connection, electromagnetic interface filter meets rectification module BRI, connect resistance R 1 between electromagnetic interface filter and the rectification module BRI, be parallel with switch on the resistance R that powers on 1, switch connects the relay R Y1 that powers on, the upper parallel diode D1 of the relay R that powers on Y1, the relay R that powers on Y1 is connected with upper relay control unit; Described DC chopped-wave translation circuit is non-isolation boosting inverter of chopping, this circuit is by IGBT switching tube Q1, diode M1, boost inductance L1, the PFC control circuit, equalizing resistance R2-R6 and filter capacitor C5, C6 consists of, the rectification module output head anode is by resistance R 2, R3 connects the PFC control circuit, the rectification module negative pole of output end is by resistance R s, R4 connects the PFC control circuit, R3 one termination PFC control circuit, another termination boost inductance L1, the PFC control circuit connects IGBT switching tube Q1 base stage, IGBT switching tube Q1 colelctor electrode is connected between boost inductance L1 and the diode M1, IGBT switching tube Q1 emitter stage connects capacitor C 6, another termination capacitor C 5 of diode M1; Described half-bridge isolated variable circuit is made of IGBT switching tube Q2, Q3, capacitor C 7, C8, DC chopped-wave translation circuit output connecting resistance R7, R8, capacitor C 7, C8, capacitor C 7 another termination IGBT switching tube Q2 colelctor electrodes, IGBT switching tube Q2 base stage connects the IGBT drive circuit, IGBT switching tube Q2 emitter stage connects the former limit of high frequency transformer T1, IGBT switching tube Q3 emitter stage connects capacitor C 8 other ends, and colelctor electrode connects the former limit of high frequency transformer T1, and base stage connects the IGBT drive circuit; Described high-frequency rectification circuit is made of high frequency transformer T1, diode M2, M3, filter inductance L2, tapped output centered by the high frequency transformer T1 secondary, high frequency transformer T1 meets diode M2, M3, diode M2, M3 connect filter inductance L2, the end of filter inductance L2 and high frequency transformer T1 secondary centre cap connect the electric welding machine output electrode, and rectification circuit is by capacitor C 9, C10 ground connection; Connect the IGBT drive circuit before the electric welding machine output electrode, output voltage detecting circuit, temperature sensing circuit, temperature and resistance, the electric welding machine control module is by the control of pwm signal output realization to the IGBT drive circuit, described electric welding machine control module and the relay control unit that powers on, the IGBT drive circuit, output voltage detecting circuit, temperature sensing circuit, temperature and resistance, the cooling blower control module, Switching Power Supply all realizes related control, the cooling blower control module connects cooling blower, and described electric welding machine control module has liquid crystal display, the man-machine interface of keyboard and button is at interior demonstration and operating unit.
The know-why that its technical problem that solves the utility model adopts is: this electric welding machine is directly powered by the 85Vac-264Vac single phase alternating current power supply, produces electric current and the voltage that is used for welding through rectification circuit, DC chopped-wave translation circuit, half-bridge isolated variable circuit, high-frequency rectification circuit.Single phase ac input voltage (85Vac-264Vac) is connected to power on resistance R 1 and the relay R Y1 that powers on through input switch QF1, electromagnetic interface filter, obtain again the DC voltage of full-wave rectification through single-phase uncontrollable rectification module BRI, the DC chopped-wave translation circuit of this full-wave direct current voltage through being made of boost inductance L1, IGBT switching tube Q1, diode M1 and filter capacitor C5, C6 obtains pressing than galvanic current of nearly 380Vdc.The half-bridge isolated variable circuit that this DC voltage consists of via IGBT switching tube Q2, Q3 and capacitor C 7, C8 is reverse into the high frequency voltage of alternation.High frequency voltage is input to the former limit of high frequency transformer T1, tapped output centered by the secondary, and via the high-frequency rectification circuit that diode M2, M3, filter inductance L2 consist of, obtain the controlled DC voltage about DC0-100V, and output to the outside, be used for welding.
Described electric welding machine control module refers to electric welding machine process intelligent control module, half-bridge isolated variable circuit is carried out control by the semi-bridge alternation control module, the electric welding machine control module is carried out centralized Control to copped wave conversion control module, semi-bridge alternation control module, upper relay control unit and cooling blower control module, this control module has the man-machine interfaces such as liquid crystal display, keyboard and button, can control multiple welding manner, this control is realized under the software program of working out by microprocessor, can finish various welding control modes according to program.This electric welding machine adopts single-chip microcomputer and high-performance power management chip as control core, realizes the intellectuality control of Current Control and the welding process of electric welding machine.The electric welding machine control module is control core, by parameter and the welding manner of setting, can automatically realize the control to various bond patterns, satisfies the input voltage range of 85Vac-264Vac, adapts to the power supply form of global range.
The beneficial effects of the utility model: this electric welding machine adopts high frequency, soft switch technique, thus have that volume is little, lightweight, efficient is high, power factor is high, to advantages such as electric network influencing are little.Intellectuality, the high-quality welding of electric welding machine have been realized; can in the 85Vac-264Vac voltage range, work; can satisfy the High Power Factor inverse type dc welding machine that global range is used; can automatically realize the welding procedure of different working condition requirements, have perfect defencive function, fault alarm and processing capacity.
Description of drawings
The below further describes the utility model in conjunction with the accompanying drawings and embodiments:
It is the wide voltage input electric welding machine circuit schematic diagram of single-phase power factor correcting technology among the figure.
In the drawings, the 1.PFC control circuit, 2. electric welding machine output electrode, 3.IGBT drive circuit, 4. output voltage detecting circuit, 5. temperature sensing circuit, 6. temperature and resistance, the output of 7.PWM signal, 8. Switching Power Supply, 9. the electric welding machine control module, 10. go up relay control unit, 11. demonstrations and operating unit, 12. cooling blower control modules, 13. cooling blowers.
The specific embodiment
This circuit comprises power conversion circuit and electric welding machine control module, described power conversion circuit comprises rectification circuit, the DC chopped-wave translation circuit, half-bridge isolated variable circuit, high-frequency rectification circuit, described rectification circuit is uncontrollable rectification circuit, this circuit is by input switch QF1, electromagnetic interface filter, resistance R 1 powers on, the relay R that powers on Y1, upper relay control unit 10, and rectification module BRI consists of, described rectification module BRI is single-phase uncontrollable rectification module BRI, electromagnetic interface filter input termination capacitor C 1, output termination capacitor C 2, and by capacitor C 3, C4 ground connection, electromagnetic interface filter meets rectification module BRI, connect resistance R 1 between electromagnetic interface filter and the rectification module BRI, be parallel with switch on the resistance R that powers on 1, switch connects the relay R Y1 that powers on, the upper parallel diode D1 of the relay R that powers on Y1, the relay R that powers on Y1 is connected with upper relay control unit 10; Described DC chopped-wave translation circuit is non-isolation boosting inverter of chopping, this circuit is by IGBT switching tube Q1, diode M1, boost inductance L1, PFC control circuit 1, equalizing resistance R2-R6 and filter capacitor C5, C6 consists of, rectification module BRI output head anode is by resistance R 2, R3 connects PFC control circuit 1, rectification module BRI negative pole of output end is by resistance R s, R4 connects PFC control circuit 1, R3 one termination PFC control circuit 1, another termination boost inductance L1, PFC control circuit 1 connects IGBT switching tube Q1 base stage, IGBT switching tube Q1 colelctor electrode is connected between boost inductance L1 and the diode M1, IGBT switching tube Q1 emitter stage connects capacitor C 6, another termination capacitor C 5 of diode M1; Described half-bridge isolated variable circuit is made of IGBT switching tube Q2, Q3, capacitor C 7, C8, DC chopped-wave translation circuit output connecting resistance R7, R8, capacitor C 7, C8, capacitor C 7 another termination IGBT switching tube Q2 colelctor electrodes, IGBT switching tube Q2 base stage connects the IGBT drive circuit, IGBT switching tube Q2 emitter stage connects the former limit of high frequency transformer T1, IGBT switching tube Q3 emitter stage connects capacitor C 8 other ends, and colelctor electrode connects the former limit of high frequency transformer T1, and base stage connects the IGBT drive circuit; Described high-frequency rectification circuit is made of high frequency transformer T1, diode M2, M3, filter inductance L2, tapped output centered by the high frequency transformer T1 secondary, high frequency transformer T1 meets diode M2, M3, diode M2, M3 connect filter inductance L2, the end of filter inductance L2 and high frequency transformer T1 secondary centre cap connect the electric welding machine output electrode, and rectification circuit is by capacitor C 9, C10 ground connection; Meet IGBT before the electric welding machine output electrode and drive electricity, 3, output voltage detecting circuit 4, temperature sensing circuit 5, temperature and resistance 6, the control that electric welding machine control module 9 is realized IGBT drive circuit 3 by pwm signal output 7, described electric welding machine control module 9 and the relay control unit 10 that powers on, IGBT drive circuit 3, output voltage detecting circuit 4, temperature sensing circuit 5, temperature and resistance 6, cooling blower control module 12, Switching Power Supply 8 all realizes related control, cooling blower control module 12 connects cooling blower 13, and described electric welding machine control module 9 has liquid crystal display, the man-machine interface of keyboard and button is at interior demonstration and operating unit 11.
This electric welding machine is directly powered by the 85Vac-264Vac single phase alternating current power supply, produces electric current and the voltage that is used for welding through rectification circuit, DC chopped-wave translation circuit, half-bridge isolated variable circuit, high-frequency rectification circuit.Single phase ac input voltage (85Vac-264Vac) is connected to power on resistance R 1 and the relay R Y1 that powers on through input switch QF1, electromagnetic interface filter, obtain again the DC voltage of full-wave rectification through single-phase uncontrollable rectification module BRI, the DC chopped-wave translation circuit of this full-wave direct current voltage through being made of boost inductance L1, IGBT switching tube Q1, diode M1 and filter capacitor C5, C6 obtains pressing than galvanic current of nearly 380Vdc.The half-bridge isolated variable circuit that this DC voltage consists of via IGBT switching tube Q2, Q3 and capacitor C 7, C8 is reverse into the high frequency voltage of alternation.High frequency voltage is input to the former limit of high frequency transformer T1, tapped output centered by the secondary, and via the high-frequency rectification circuit that diode M2, M3, filter inductance L2 consist of, obtain the controlled DC voltage of 0-200VDC, and output to the outside, be used for welding.
Described electric welding machine control module 9 refers to electric welding machine process intelligent control module, half-bridge isolated variable circuit is carried out control by the semi-bridge alternation control module, 9 pairs of copped wave conversion of electric welding machine control module control module, the semi-bridge alternation control module, upper relay control unit 10 and cooling blower control module 12 are carried out centralized Control, this control module has liquid crystal display, the man-machine interface such as keyboard and button, can control multiple welding manner, this control is realized under the software program of working out by microprocessor, can finish various welding control modes according to program.This electric welding machine adopts single-chip microcomputer and high-performance power management chip as control core, realizes the intellectuality control of Current Control and the welding process of electric welding machine.Electric welding machine control module 9 is control cores, by parameter and the welding manner of setting, can automatically realize the control to various bond patterns, satisfies the input voltage range of 85Vac-264Vac, adapts to the power supply form of global range.
Claims (1)
1. the wide voltage of single-phase power factor correcting technology is inputted electric welding machine circuit, comprise power conversion circuit and electric welding machine control module, it is characterized in that: described power conversion circuit comprises rectification circuit, the DC chopped-wave translation circuit, half-bridge isolated variable circuit, high-frequency rectification circuit, described rectification circuit is uncontrollable rectification circuit, this circuit is by input switch QF1, electromagnetic interface filter, resistance R 1 powers on, the relay R that powers on Y1, upper relay control unit, and rectification module BRI consists of, described rectification module BRI is single-phase uncontrollable rectification module, electromagnetic interface filter input termination capacitor C 1, output termination capacitor C 2, and by capacitor C 3, C4 ground connection, electromagnetic interface filter meets rectification module BRI, connect resistance R 1 between electromagnetic interface filter and the rectification module BRI, be parallel with switch on the resistance R that powers on 1, switch connects the relay R Y1 that powers on, the upper parallel diode D1 of the relay R that powers on Y1, and the relay R that powers on Y1 is connected with upper relay control unit; Described DC chopped-wave translation circuit is non-isolation boosting inverter of chopping, this circuit is by IGBT switching tube Q1, diode M1, boost inductance L1, the PFC control circuit, equalizing resistance R2-R6 and filter capacitor C5, C6 consists of, the rectification module output head anode is by resistance R 2, R3 connects the PFC control circuit, the rectification module negative pole of output end is by resistance R s, R4 connects the PFC control circuit, R3 one termination PFC control circuit, another termination boost inductance L1, the PFC control circuit connects IGBT switching tube Q1 base stage, IGBT switching tube Q1 colelctor electrode is connected between boost inductance L1 and the diode M1, IGBT switching tube Q1 emitter stage connects capacitor C 6, another termination capacitor C 5 of diode M1; Described half-bridge isolated variable circuit is made of IGBT switching tube Q2, Q3, capacitor C 7, C8, DC chopped-wave translation circuit output connecting resistance R7, R8, capacitor C 7, C8, capacitor C 7 another termination IGBT switching tube Q2 colelctor electrodes, IGBT switching tube Q2 base stage connects the IGBT drive circuit, IGBT switching tube Q2 emitter stage connects the former limit of high frequency transformer T1, IGBT switching tube Q3 emitter stage connects capacitor C 8 other ends, and colelctor electrode connects the former limit of high frequency transformer T1, and base stage connects the IGBT drive circuit; Described high-frequency rectification circuit is made of high frequency transformer T1, diode M2, M3, filter inductance L2, tapped output centered by the high frequency transformer T1 secondary, high frequency transformer T1 meets diode M2, M3, diode M2, M3 connect filter inductance L2, the end of filter inductance L2 and high frequency transformer T1 secondary centre cap connect the electric welding machine output electrode, and rectification circuit is by capacitor C 9, C10 ground connection; Connect the IGBT drive circuit before the electric welding machine output electrode, output voltage detecting circuit, temperature sensing circuit, temperature and resistance, the electric welding machine control module is by the control of pwm signal output realization to the IGBT drive circuit, described electric welding machine control module and the relay control unit that powers on, the IGBT drive circuit, output voltage detecting circuit, temperature sensing circuit, temperature and resistance, the cooling blower control module, Switching Power Supply all realizes related control, the cooling blower control module connects cooling blower, and described electric welding machine control module has liquid crystal display, the man-machine interface of keyboard and button is at interior demonstration and operating unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220651118 CN202894546U (en) | 2012-11-18 | 2012-11-18 | Wide-voltage-input electric welder circuit based on single-phase power-factor correction technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220651118 CN202894546U (en) | 2012-11-18 | 2012-11-18 | Wide-voltage-input electric welder circuit based on single-phase power-factor correction technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202894546U true CN202894546U (en) | 2013-04-24 |
Family
ID=48115263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220651118 Expired - Lifetime CN202894546U (en) | 2012-11-18 | 2012-11-18 | Wide-voltage-input electric welder circuit based on single-phase power-factor correction technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202894546U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579112A (en) * | 2015-01-25 | 2015-04-29 | 襄阳绿控电气科技有限公司 | Auxiliary power controller used for electric automobile |
| CN105048605A (en) * | 2015-09-10 | 2015-11-11 | 重庆雅讯电源技术有限公司 | Online storage battery pack delayed battery emergency assistant system and working methods thereof |
| CN105186853A (en) * | 2015-08-17 | 2015-12-23 | 深圳华意隆电气股份有限公司 | Three-phase staggered active PFC welding and cutting machine power supply |
| CN112039337A (en) * | 2020-09-02 | 2020-12-04 | 重庆中车四方所科技有限公司 | Emergent ventilation power supply circuit system of air conditioner |
| CN112600425A (en) * | 2020-12-02 | 2021-04-02 | 南京民联仪器制造有限公司 | Low-current controllable rectifier working in ultralow-frequency dielectric loss measuring device and rectification control method thereof |
-
2012
- 2012-11-18 CN CN 201220651118 patent/CN202894546U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579112A (en) * | 2015-01-25 | 2015-04-29 | 襄阳绿控电气科技有限公司 | Auxiliary power controller used for electric automobile |
| CN105186853A (en) * | 2015-08-17 | 2015-12-23 | 深圳华意隆电气股份有限公司 | Three-phase staggered active PFC welding and cutting machine power supply |
| CN105186853B (en) * | 2015-08-17 | 2018-01-26 | 深圳华意隆电气股份有限公司 | A kind of active PFC weldings electromechanical source of three phase cross-over formulas |
| CN105048605A (en) * | 2015-09-10 | 2015-11-11 | 重庆雅讯电源技术有限公司 | Online storage battery pack delayed battery emergency assistant system and working methods thereof |
| CN105048605B (en) * | 2015-09-10 | 2017-12-19 | 重庆雅讯电源技术有限公司 | A kind of online batteries behindhand battery emergency response assistant system and its method of work |
| CN112039337A (en) * | 2020-09-02 | 2020-12-04 | 重庆中车四方所科技有限公司 | Emergent ventilation power supply circuit system of air conditioner |
| CN112600425A (en) * | 2020-12-02 | 2021-04-02 | 南京民联仪器制造有限公司 | Low-current controllable rectifier working in ultralow-frequency dielectric loss measuring device and rectification control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102593869B (en) | H full-bridge conversion type micro-inverter grid connecting device | |
| CN202894546U (en) | Wide-voltage-input electric welder circuit based on single-phase power-factor correction technology | |
| CN201792079U (en) | Multifunctional double-wire digital soft switching inverter welding power source system | |
| CN101791733A (en) | Aluminium alloy twin-wire dipulse welding method and welding power supply thereof | |
| CN201552368U (en) | A kind of aluminum alloy twin-wire double-pulse digital soft-switching inverter welding power supply | |
| CN103817402A (en) | Multifunctional high-frequency inversion direct-current electric welding machine realizing circuit | |
| CN202931222U (en) | Inverter power supply control device | |
| CN211018677U (en) | A Numerically Controlled Short Arc DC Superimposed Pulse Power Supply | |
| CN204843217U (en) | Multi -functional IGBT high frequency contravariant DC welding, dual -purpose machine charges | |
| CN204700414U (en) | A kind of electric welding machine circuit of APFC | |
| CN103706922B (en) | Visual efficient tube plate welding system | |
| CN203448847U (en) | High-power double-wire pulse MIG welding inverter power supply system | |
| CN201118463Y (en) | A high-power high-frequency soft-switching IGBT inverter sintered power supply | |
| CN201374647Y (en) | Forestage DC/DC converter of a fuel battery grid-connected inverter | |
| CN204442168U (en) | A kind of based on without bridge CUK isolated form Three Phase Power Factor Correction Converter | |
| CN208147104U (en) | A kind of welding machine control circuit and welding machine | |
| CN113732445B (en) | Auxiliary welding excitation power supply system and multi-mode current generation method | |
| CN213379952U (en) | Welding control system for cold welding machine and cold welding machine | |
| CN103862158A (en) | Manual intermediate frequency resistance welding control cabinet | |
| CN209267468U (en) | Step-up three-leg inverter | |
| CN104967304A (en) | An isolated three-phase power factor correction converter based on bridgeless CUK | |
| CN202106127U (en) | CPU-controlled high-power portable electric welding machine | |
| CN203434888U (en) | Inversion arc-welding power supply suitable to be AC/DC double voltage input | |
| CN2806037Y (en) | IGBT contravariant multifunctional welding and cutting machine | |
| CN103358004A (en) | High-frequency direct-current resistance seam welder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130424 |