CN102785005A - MOSFET (metal-oxide-semiconductor field effect transistor)-based inverter type welding equipment by sdie inlet air - Google Patents
MOSFET (metal-oxide-semiconductor field effect transistor)-based inverter type welding equipment by sdie inlet air Download PDFInfo
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- CN102785005A CN102785005A CN2011101294901A CN201110129490A CN102785005A CN 102785005 A CN102785005 A CN 102785005A CN 2011101294901 A CN2011101294901 A CN 2011101294901A CN 201110129490 A CN201110129490 A CN 201110129490A CN 102785005 A CN102785005 A CN 102785005A
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Abstract
The invention discloses inverter type welding equipment by using side inlet air. The inverter type welding equipment comprises a front panel, a rear panel, a rectifier and filter circuit, a control module, a driver module, MOSFET (metal-oxide-semiconductor field effect transistor) devices, an inverter module, a rectifier module, a high-frequency transformer, a current regulating device, an input power line, an output port, a fan, a rack and the like. The inverter type welding equipment is chracterized in that the fan is installed at the side of the rack, air outlets are arranged on the front panel and the rear panel, heat-transfer surfaces of the MOSFET devices are arranged on an identical plane which keeps close thermal contact with one same plane of E-shaped heat sinks and forms the inverter module by being installed together with a driver plate, a rectification module and the heat sinks are installed together to form the rectifier module, the fan is arranged above fins of the E-shaped heat sinks of the inverter module, airstream flows vertically to the fins of the heat sinks and flows along a flow channel formed by the fins of the heat sinks so as to continue to cool the rectification module and a main transformer; the airstream is discharged out of the rack from the air outlets on the front panel and the rear panel, so as to form the inverter type welding equipment which has high heat dissipation efficiency, high load rate and simple structure, and is stable and reliable.
Description
Technical field
The present invention relates to a kind of employing MOSFET (field-effect transistor) and be the contravariant welding equipment of driving element; This kind welding equipment can be used for the welding of metal material; Compare with general MOSFET welding equipment, the present invention simplifies the structure, has alleviated weight, has improved cyclic duration factor, reduced manufacturing cost.That the welding equipment that adopts technology of the present invention to form has is light, energy-conservation, diverse in function, characteristics safe and reliable, with low cost.
Background technology
Conventional inversion formula welding equipment is divided into IGBT modular and MOSFET discrete component formula, and the former advantage is simple in structure, and heat radiation is evenly convenient, but because operating frequency is low, volume is big, cost is high; The latter's advantage is that operating frequency is high, the cost of material is low, volume is little, in light weight, light, but circuit and structure more complicated.
Existing MOSFET welding equipment adopts the method for placing fan behind the place ahead usually; The gas channel that connects before and after forming; For MOSFET device, main transformer, rectifying device provide radiating condition, like State Intellectual Property Office's patent No. 200820105122.7 the structure that patent adopted.
The shortcoming of the inverter type welder of traditional MOSFET device is:
1, operating frequency is too high, and various devices are all had higher requirement, and circuit is subject to disturb.
2, be resistive during the switching tube conducting, the big more heating of electric current is big more, and heat is difficult for scattering.
3, secondary rectification circuit adopts a plurality of associations of fast recovery diode and since the bad need of the related uniformity of multitube to electrical quantity strictness select, mate and very easily damage when bad.
4, the bad cyclic duration factor that causes of radiating effect is low, and the work period of permission is short, inefficiency.
5, because the MOSFET number of devices is many, be distributed in the bigger scope, generally adopt the mode of front air intake to cool off, air flow path is long, and exchange capability of heat is poor, is prone to cause the MOSFET heat radiation uneven, and the heat radiation of parts such as high frequency transformer, rectifier is bad.
6, will need to adopt the radiator and the Metal Structural Parts of larger volume usually, structure is single, weight is heavier, and manufacturing cost is higher.
Summary of the invention
Side air inlet formula contravariant welding equipment of the present invention comprises shell, pedestal, front and back panel, power supply input lead, input rectifying filter circuit, welding output, switch, adjusting knob, ammeter, control circuit board, MOSFET device, rectifier module, high frequency transformer, E type radiator, fan, and it is characterized in that: the hole of power input line on rear board is connected to the input rectifying filter circuit; Drive circuit board, switch, ammeter, adjusting knob, welding output are installed on the front panel, and dividing plate is connected with support; Support connects on the fixed pedestal, and front panel, rear board and base connect as one, and shell and pedestal, front panel, rear board constitute the space with corresponding volume; Placing rack, dividing plate, control circuit board, drive circuit board, radiator, rectifier, high frequency transformer, fan in this space; Its medium-height trestle and dividing plate constitute two spaces up and down, and upper space is placed control circuit board, power panel, and lower space is placed drive plate, radiator, high frequency transformer, secondary rectification module; There is fresh air inlet one side of shell and the corresponding position of fan; Air outlet is arranged on the front and back panel, and E type radiator, secondary rectifier module, high frequency transformer are installed on the pedestal, and more than one MOSFET device uses in groups; Arrange in order along the edge of circuit board and welded and installed on the pad on the same surface of circuit board; Its radiating surface is positioned at the circuit board downside, is on the same plane, and keeps close thermal to contact with the same flat surface of E type radiator; On the radiator relative direction fin is arranged; Fin forms the runner of both sides perforation forwards, backwards, and fan is equipped with in the fin top, and fan is connected on the radiator; The fan airstream direction flows to the direction of radiator; And the runner continuous-flow that can form along fin, on the air path that the runner of radiator forms, rectifier, high frequency transformer are installed; Described element, parts, part are pressed functional sequence and are formed electric connecting relation, form the contravariant welding equipment welding accomplished function, side air inlet with direct current output.
E type radiator material is generally metal material, adopts the good metal material of thermal conductivity, forms with the method processing and manufacturing that stretches and extrude like copper, aluminium and alloy material thereof.
Described contravariant welding equipment, its characteristic also is: the secondary rectifier is a rectification module, and the high frequency transformer output is gone ahead of the rest to be connected with the rectification module input after the parallel connection again and is carried out rectification, and the frequency of rectification module input current can reach 100KHz.
In the past, be to realize purpose that the electric current of high-frequency high-power is carried out rectification, parallel connection is same output output welding current to need to adopt alternating current to each high frequency transformer output to carry out after the rectification more respectively; Need to adopt a plurality of high-frequency rectification devices (fast recovery diode); Each device need be installed in independently on the circuit board and radiator, need connect with heavy in section lead, and not only circuit structure is complicated to adopt this method; Installation and maintenance process property are poor, and reliability is low.Though and the general rectification module circuit that adopts of IGBT formula inversion welding equipment is simple, operating frequency is lower, only can reach 20KHz.The present invention adopts special-purpose power rectifier module, and frequency is high, and electric current is big, has simplified circuit structure greatly, has improved reliability, has reduced manufacturing and maintenance cost.
Described contravariant welding equipment, its characteristic also is: described contravariant welding machine, its control circuit board can be common linearity or pulse control mode, also can be the control mode of the numeral output of adopting MCU driving.
Described contravariant welding equipment, its characteristic also is: its shell can form through panel beating for metal material, also can adopt resin material, forms through injection moulding processing.
Described contravariant welding equipment, its characteristic also is: can adopt the MOSFET device and the corresponding parts of varying number, constitute the contravariant welding equipment of different capacity grade.
Described contravariant welding equipment, its characteristic also is: can match with air valve, high frequency arc starter, formation can be carried out the contravariant welding equipment of gas shielded arc welding connection function.
Described contravariant welding equipment, its characteristic also is: can castor be installed on base and constitute movably welding equipment, also handle and braces can be installed on shell, constitute portable set.
Described contravariant welding equipment, its characteristic also is: install with panel on ammeter, can be for pointer-type, also can be for digital.
The problem that the present invention solves is: adopted side-mounted fan, and MOSFET is installed on the same module, its radiating surface is on the same plane; And keep close thermal to contact with the same plane of radiator; Same radiator capable of using dispels the heat, and fan directly is installed on the fin top of radiator, makes the radiating surface of fan and MOSFET keep nearest distance; The heat that produces in the time of can MOSFET being worked is taken away rapidly, and keeps all MOSFET to be in identical radiating state.And high frequency transformer, rectification module also are on the air flow channel that heat radiator fin forms, and can also obtain good heat radiation.
Rectification module separates each self-rectifying mode owing to changed the output of general each transformer of MOSFET contravariant welding machine; Rectifier is processed rectification module, not only reduced the volume of rectifier, and improved heat dissipating state; Lower the complexity of circuit, reduced cost.
The weak point that exists based on two types of welding equipments of IGBT and MOSFET as previously mentioned; The present invention has combined all advantages of above-mentioned two styles; Existing IGBT contravariant welding equipment characteristic simple in structure; Have also that MOSFET contravariant welding equipment operating frequency is high, the characteristics of small volume and less weight, the contravariant welding equipment that forms possesses the reliability height, volume is little, efficient is high, cyclic duration factor is high, low cost of manufacture, keeps in repair the advantage of each side such as easy.What need special instruction is that the present invention has also significantly reduced material cost and manufacturing cost to control inversion rectification three parts modularization.
Welding machine belongs to special installation, is easy to produce shock hazard, and the national requirements user of institute will hold " welder's card " " job qualification certificate " could operate electric welding machine.Raising by present living standards of the people.Electric welding machine becomes the everyday tools that average family uses gradually, and its security is had higher requirement.The present invention also is provided with the electrocution-proof protection circuit.
Description of drawings
Below with the diagram the present invention is further explained.
Fig. 1-1 is the basic structure sketch map of side-looking of the contravariant welding equipment of side air inlet.
Fig. 1-2 is the sketch map of main heating parts of the present invention installation site relation and inlet air flow path.
Fig. 2-1 and Fig. 2-2 is the circuit theory diagrams of the main circuit that the present invention adopted.
Fig. 3 is an each several part circuit connecting relation sketch map of the present invention.
Fig. 4 is the each several part assembling sketch map of inversion assembly of the present invention.
Fig. 5 is the each several part assembling sketch map of rectification module of the present invention.
Fig. 6 is the rectifying and wave-filtering on dividing plate and top, the assembling signal of control panel.
Fig. 7-1 is the view of basic structure one side of first kind of embodiment of the present invention.
Fig. 7-2 is the view of the basic structure opposite side of first kind of embodiment of the present invention.
The specific embodiment
Fig. 1-1 is the side view of basic structure sketch map of the contravariant welding equipment of side air inlet, Fig. 1-2 be the radiating subassembly in the following space of dividing plate distribute vertical view.The direction of arrow among Fig. 1-2 is the direction that cooling blast flows.
101 is control circuit board among the figure, and 102 is control handle, and 103 is front panel, and 104 is air outlet; 105 are the welding output, and 106 is high frequency transformer, and 107 is the rectification module radiator, and 108 is fan; 109 is the inversion module radiator, and 110 is rear board, and 111 is dividing plate; 112 is drive plate, and 113 is the MOSFET device, and 114 is rectification module, and 115 is air inlet.
Wherein MOSFET device 113 is installed on the circuit board in groups; Be fixed on plane one side of E type radiator 109 again; The radiating surface of MOSFET device is positioned on the same plane; Its radiating surface and radiator constitute the relation of insulation and thermo-contact, and its pin is welded on the circuit board, and constitute drive circuit through circuit board and other elements.Fan 118 is installed on the top of the fin of radiator 109 opposite sides, and its airflow direction blows to the fin direction of radiator 109.Rectification module 114 is installed together with radiator 107, and its radiating surface keeps closely contacting with the plane of radiator, and the fin orientation of radiator 107 is identical with 109, constitutes air flow channel; High frequency transformer 106 is installed on the circuit board, and constitutes corresponding annexation through the circuit on the circuit board, and circuit board is installed on the radiator 107, high frequency transformer 106 be positioned at that fin by radiator 109,107 constitutes air flow channel on.Current adjusting knob 102 and welding output 105 are housed on panel, all have air outlet 104 on the front and back panel.
When contravariant welding equipment of the present invention is worked; Fan energising work blows to the fin of radiator 109 with air-flow, the heat that produces during main power device MOSFET work through its radiating surface to radiator 109 conduction; Because fan 108 is near apart from the distance of radiator 109; Current rate is big, can heat be with discrete heat device 109 rapidly, makes radiator 109 and MOSFET device 113 keep lower temperature.The fin that air communication is crossed radiator 109 flows to radiator 107; Take away the heat that rectification module 114 produces, pass through high frequency transformer 106 again, take away the heat that it distributes; Be discharged to the machine exterior space from air outlet 104 at last, just reached purpose for the heat radiation of main heating parts.
Fig. 2 is the circuit theory diagrams that an embodiment of the present invention adopted.
The present invention includes main circuit and control circuit, main circuit is followed successively by input switch, input rectifying filtering, inverter circuit, main transformer T1, T2, T3, output rectification circuit.Main circuit becomes high direct voltage after with the filtering of 50HZ commercial power rectification, and become high frequency square wave through inverter circuit again and exchange 100KHZ, through T1, T2, T3 supplies welding to use after secondary commutation is filtered into DC current source.
In an embodiment of the present invention, can all circuit be processed 4 wiring boards, interchangeability is high; PCB is compatible strong; Not only greatly facilitate the after-sale service problem, when can also be in implementation process needing to make the machine of different capacity, can realize the power wanted through changing main circuit parameter.
The present invention feeds back in the control circuit after utilizing machine output voltage feedback circuit with the coupling of high accuracy optocoupler; Make machine wait standby state output voltage low (output voltage has only direct current 9-12V) can also further not play energy-conservation effect to people's electric shock.
Control circuit comprises the MOSFET drive circuit, PWM regulating circuit, control circuit and control power supply thereof.The grid of the G1G2G3G4 4.7-10R fixed carbon resister of all connecting among the PCB3, preventing to drive overshoot, and protection drive circuit PCB1 does not receive because MOSFET punctures and passes the voltage of coming and damage.
Electric current is given, overcurrent and indication, PWM drive preposition amplification, feedback processing circuit.Electric current is given, the given set-point that is user's setting of thrust; The given current feedback signal after mutual inductor sample is handled of two-way is sent into error amplifier and is compared; Obtain error voltage, error voltage control PWM regulating circuit produces the pulse signal of certain width, and this pulse is sent into driving transformer T4 through preposition amplification; Again through certain MOSFET that handles on the rear drive main circuit, to obtain welding current.
Inverter circuit adopts full-bridge hard switching structure, and switching tube is by MOSFET G1, G4 and G2, and G3 constitutes the brachium pontis of alternate conduction, produces the high-frequency and high-voltage square wave alternating-current, through T1, T2, T3 main transformer step-down rectifier is filtered into the low voltage direct current source.Resistance capacitance between the MOSFET collector emitter is that spike absorbs circuit.
T1, T2, T3 play power coupling and electrical isolation effect in circuit, this high frequency transformer adopts high accuracy high-frequency magnetic material to make, and is provided with high pressure resistant, high temperature resistant insulating barrier between the primary and secondary coil.
The PWM regulating circuit adopts both-end output current control type pulse width modulator chip 3525.
The MOSFET drive circuit adopts pulse transformer to drive, to realize isolation and to drive.
The present invention's inverter circuit has adopted full-bridge hard switching circuit, by MOSFET G1, and G4 and G2, G3 alternate conduction.The MOSFET power device has that capacity is big, switching loss is little, withstand voltage height, Heat stability is good, driving is simple, frequency is high, high conformity, low cost and other advantages.Just because of this, machine power greatly then can use the multitube association to get final product, because caloric value is low, need not very big blower fan and radiator, has dwindled the volume of complete machine greatly.The high frequency transformer that the present invention adopted has used microcrystallizing alloy unshakable in one's determination, has big, the advantages such as making things convenient for, be easy to installation of dispelling the heat of power density.
Be instant inversion because direct current becomes to exchange, the frequency that in this process, exchanges is very high, and 100-200KHZ is generally arranged.Because frequency is very high, make the few iron core of the main transformer number of turn also very little, and then can make machine volume little, in light weight, main transformer can improve overall efficiency because loss is little simultaneously.Characteristic of the present invention is being; Because both-end output current control type pulse width modulator chip 3525, employing be peak point current control method, its advantage is: soft start function, dynamic response is good, output accuracy is high, good stability; Two have the transient protective function; Can effectively prevent the MOSFET overcurrent, the 3rd, can prevent the generation of main transformer magnetic bias, if the serious magnetic bias of main transformer can make MOSFET and main transformer damage.
Fig. 3 is the block diagram that is electrically connected of contravariant welding equipment of the present invention, and wherein 301 is current rectifying and wave filtering circuit, and 302 is the inverter circuit that is made up of the MOSFET set of devices; 303 is high frequency transformer, and 304 is secondary rectification circuit, and 305 is the electrocution-proof protection circuit; 306 is control module, and 307 is inverse changing driving circuit, and 308 is auxiliary power circuit; 309 is fan, and 310 is power input, and 311 are the welding output.
Its basic functional principle is: outside power frequency ac voltage is input to current rectifying and wave filtering circuit 301 from input 310, changes dc high voltage into, and accessory power supply output DC low-voltage is for individual partial circuit provides stable working power.Control module 306 provides control signal, amplifies MOSFET group on the back control inverter circuit 302 by the rule conducting through drive plate 307, converts high voltage direct current the pulse power of high frequency into, and owing to the good characteristic of MOSFET, frequency can be up to 100KHz.This high frequency pulse power supply becomes the dc source of the welding usefulness with welding characteristic again through high frequency transformer 303 step-downs through rectification module 304 secondary rectifications.305 is the electrocution-proof protection circuit, and its effect is to make the welding output when zero load, keep a low-voltage state, thereby ensures user's safety.
Fig. 4 is the sketch map of the concrete structure of MOSFET inversion module.Wherein 401 is the MOSFET device, and 402 is capacitance, and 403 is driving transformer, and 404 is filter capacitor, and 405 is the drive controlling plate, and 406 is the inversion control plate, and 407 is deep bead.Wherein the radiating surface of MOSFET set of devices 401 all is positioned on the plane; And keep thermo-contact closely with the same plane of radiator 408; And adopt the securing member fixed connection on radiator 408; 402,403,404 be installed on the circuit board 405, drive controlling plate 405 is fixing again and be connected on the inversion control plate 406 range upon range of functional unit of radiator 408 formation.407 is deep bead, has air vent on it, its role is to and can fan be installed on it, and can keep air-flow in the runner of the fin formation of E type radiator 408, to flow during work.
Fig. 5 is the concrete structure sketch map of rectification module group.Wherein 501 is the main transformer group, and 502 is rectification module, and 503 is radiator.Main transformer is installed on the circuit board, and keeps corresponding annexation through circuit connection, and transformer body is positioned on the runner that the fin of radiator 503 forms.Rectification module 502 keeps close thermal to contact with the plane of radiator 503, and the heat that rectification module 502 produces during work is transmitted on the radiator 503, reaches the purpose of heat radiation through the air-flow of the fin of flowing through.Air-flow is taken away the heat that the main transformer main body is distributed simultaneously, reaches cooling purpose.
Fig. 6 is the installation concrete structure sketch map of dividing plate and cowling panel control panel, and wherein 601 is control module, and 602 is filter capacitor, and 603 are master board, and 604 is dividing plate.601,602 be installed on 603,603 are fixed on the dividing plate 604 through supporting the connecting piece connection again.
Fig. 7-1 and Fig. 7-2 is the structural representation of a kind of embodiment of the present invention, and wherein 701 are the welding output, and 702 is current adjusting knob, and 703 is control module; 704 is 24VDC accessory power supply module, and 705 is secondary rectification output module, and 706 is secondary rectification baffle, and 707 is filter capacitor; 708 is the MOSFET device, and 709 is CBB electric capacity, and 710 is the MOSFET driver module; 711 is isolation capacitance, and 712 is cabinet, and 713 is the rectification module radiator; 714 is main transformer, and 715 is the MOSFET radiator, and 716 is blower fan.Wherein figure below is the view of opposite side.
Wherein casing 712 can adopt the metal sheet metal component, also can adopt working of plastics; Accessory power outlet is installed on the panel, and the two poles of the earth are vertically mounted on the straight line, and the panel part is the inclined-plane, install adjustment knob and ammeter etc. on it.
Claims (7)
1. a contravariant welding equipment comprises shell, pedestal, front and back panel, power supply input lead, input rectifying filter circuit, welding output, switch, adjusting knob, ammeter, control circuit board, MOSFET device, rectifier module, high frequency transformer, E type radiator, fan; It is characterized in that: the hole of power input line on rear board is connected to the input rectifying filter circuit, drive circuit board, and switch, ammeter, adjusting knob, welding output are installed on the front panel; Dividing plate is connected with support, and support connects on the fixed pedestal, and front panel, rear board and base connect as one; Shell and pedestal, front panel, rear board constitute the space with corresponding volume, and placing rack, dividing plate, control circuit board, drive circuit board, radiator, rectifier, high frequency transformer, reactor, fan in this space, its medium-height trestle and dividing plate constitute two spaces up and down; Upper space prevents control circuit board; Lower space is placed drive plate, radiator, high frequency transformer, secondary rectification module, and there is fresh air inlet a side of shell and the corresponding position of fan, and air outlet is arranged on the front and back panel; E type radiator, secondary rectifier module, high frequency transformer are installed on the pedestal; More than one MOSFET device uses in groups, arrange in order along the edge of circuit board and welded and installed on the pad on the same surface of circuit board, its radiating surface is positioned at the circuit board downside; Be on the same plane; And keep close thermal contact with the same flat surface of E type radiator, and on the radiator relative direction fin being arranged, fin forms the runner of both sides perforation forwards, backwards; Fan is equipped with in the fin top; Fan is connected on the radiator, and the fan airstream direction flows to the direction of radiator, and can be along the runner continuous-flow of fin formation; On the air path that the runner of radiator forms; Rectifier, high frequency transformer are installed, and described element, parts, part are pressed functional sequence and are formed electric connecting relation, form the contravariant welding equipment welding accomplished function, side air inlet with direct current output.
2. contravariant welding equipment as claimed in claim 1; Its characteristic also is: the secondary rectifier is a rectification module; The high frequency transformer output is gone ahead of the rest to be connected with the rectification module input after the parallel connection again and is carried out rectification, and the frequency of rectification module input current can reach 100KHz.
3. contravariant welding equipment as claimed in claim 2, its characteristic also is: described contravariant welding machine, its control circuit board can be common linearity or pulse control mode, also can be the control mode of the numeral output of adopting MCU driving.
4. contravariant welding equipment as claimed in claim 3, its characteristic also is: its shell can form through panel beating for metal material, also can adopt resin material, forms through injection moulding processing.
5. contravariant welding equipment as claimed in claim 4, its characteristic also is: can adopt the MOSFET device and the corresponding parts of varying number, constitute the contravariant welding equipment of different capacity grade.
6. contravariant welding equipment as claimed in claim 5, its characteristic also is: can match with air valve, high frequency arc starter, formation can be carried out the contravariant welding equipment of gas shielded arc welding connection function.
7. contravariant welding equipment as claimed in claim 6, its characteristic also is: can castor be installed on base and constitute movably welding equipment, also handle and braces can be installed on shell, constitute portable set.
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|---|---|---|---|
| CN2011101294901A CN102785005A (en) | 2011-05-18 | 2011-05-18 | MOSFET (metal-oxide-semiconductor field effect transistor)-based inverter type welding equipment by sdie inlet air |
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| CN2011101294901A CN102785005A (en) | 2011-05-18 | 2011-05-18 | MOSFET (metal-oxide-semiconductor field effect transistor)-based inverter type welding equipment by sdie inlet air |
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| CN103394827A (en) * | 2013-07-17 | 2013-11-20 | 温州市小港电气有限公司 | Rectifier filter radiator unit for torch welder power supply |
| CN104439780A (en) * | 2014-11-14 | 2015-03-25 | 慈溪市鑫昶工业产品设计有限公司 | Hydraulic cylinder block weld joint welding device provided with fan for cooling |
| CN104734523A (en) * | 2014-12-31 | 2015-06-24 | 北京航天斯达科技有限公司 | Water cooling switch power amplifier structure |
| CN105356763A (en) * | 2014-08-24 | 2016-02-24 | 沈阳国建精材科技发展有限公司 | Electroosmosis large pulse-width-ratio positive-negative pulse osmosis-prevention and dehumidification power supply |
| WO2018040787A1 (en) * | 2016-08-31 | 2018-03-08 | 南通富力机电设备有限责任公司 | Digital inverter welder |
| CN109219499A (en) * | 2016-06-03 | 2019-01-15 | 自动化及焊接机股份有限公司 | Structure arrangement for plasma or the cooling system for being cut by laser bonding machine |
| CN109474165A (en) * | 2018-12-28 | 2019-03-15 | 中科新天地（合肥）环保科技有限公司 | A kind of novel low temperature plasma generation power supply |
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| CN104734523B (en) * | 2014-12-31 | 2017-06-23 | 北京航天斯达科技有限公司 | A kind of water-cooled close power amplifier structure |
| CN109219499A (en) * | 2016-06-03 | 2019-01-15 | 自动化及焊接机股份有限公司 | Structure arrangement for plasma or the cooling system for being cut by laser bonding machine |
| WO2018040787A1 (en) * | 2016-08-31 | 2018-03-08 | 南通富力机电设备有限责任公司 | Digital inverter welder |
| CN109834380A (en) * | 2017-11-27 | 2019-06-04 | 友力机电有限公司 | The radiator structure of inversion pulse argon arc welding machine |
| CN109474165A (en) * | 2018-12-28 | 2019-03-15 | 中科新天地（合肥）环保科技有限公司 | A kind of novel low temperature plasma generation power supply |
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Application publication date: 20121121 |