CN103418892A - Welding source device with energy keeping loop and control method - Google Patents
Welding source device with energy keeping loop and control method Download PDFInfo
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- CN103418892A CN103418892A CN2013103039808A CN201310303980A CN103418892A CN 103418892 A CN103418892 A CN 103418892A CN 2013103039808 A CN2013103039808 A CN 2013103039808A CN 201310303980 A CN201310303980 A CN 201310303980A CN 103418892 A CN103418892 A CN 103418892A
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Abstract
The invention discloses a welding source device with an energy keeping loop and a control method. The welding source device with the energy keeping loop comprises a voltage output circuit, a power switch tube Q1 driving circuit, a current switching power switch tube Q2 driving circuit, a supply current feedback filter circuit, a supply voltage feedback filter circuit and a core control circuit, and further comprises a welding source main circuit with the energy keeping loop. The voltage output circuit supplies voltage to the welding source main circuit, and a power switch tube Q1 and a power switch tube Q2 of the welding source main circuit are controlled by the power switch tube Q1 driving circuit and the current switching power switch tube Q2 driving circuit respectively. The supply current feedback filter circuit is used for feeding signal filter back to a current flowing by an electric arc load. The supply voltage feedback filter circuit is used for feeding signal filter back to electric arc load voltage. The core control circuit is used for controlling power-on and power-off of the energy keeping power switch tube Q1 and the current switching power switch tube Q2 in the welding source main circuit 2.
Description
Technical field
The invention belongs to technical field of hot working, particularly a kind of gas metal-arc welding connects equipment.
Technical background
Gas metal-arc welding connects technique and mainly adopts two kinds of droplet transfer processes, and a kind of is short circuiting transfer technique, and another kind is pulse transition technique.Two kinds of processes generally all adopt constant speed to send welding wire to coordinate the work of the flat external characteristics electric source modes of direct current.In short circuiting arc welding technique, electric arc is in the intermittent combustion state, and heat is inputted less, and the volume in molten bath is also less, so especially significant in the all-position weldings such as pipeline.But it is poor that conventional short circuiting arc welding has appearance of weld, the shortcoming that spatter is large.
In order to suppress the short circuit generation, splash, at present the normal method that adopts Waveform Control.Fig. 1 a-Fig. 1 c is depicted as ideal current voltage waveform and the droplet transfer process of short circuiting transfer.At t1 constantly, electric arc is in fired state, and along with sending constantly into of welding wire, arc length is shorter and shorter, at t2 moment molten drop and molten bath, is short-circuited, and now voltage descends rapidly, because impedance after molten drop and molten bath short circuit is very little, so electric current starts to rise.When molten drop and molten bath just have been short-circuited, contact area is less, forms a little fluid column, and this fluid column is called short circuit initial stage foot bridge.Now electric arc is by short circuit, and all electric currents all will flow through short circuit initial stage foot bridge.If it is larger to flow through the electric current of short circuit initial stage foot bridge, easily cause quick-fried breaking, thereby produce, splash.So the t2 occurred in short circuit constantly, should reduce rapidly welding current, avoid short circuit initial stage foot bridge quick-fried disconnected, suppress to splash generation.Molten drop is sprawled and is come in molten bath gradually afterwards, and the diameter of fluid column increases, and the major part of molten drop is transferred among molten bath, as shown in t3 in figure.But because short circuit initial stage electric current reduces, cause the electromagnetic contractile force deficiency, so, after molten drop is sprawled in molten bath, should increase rapidly electric current, impel necking down to produce, prevent the appearance of solid short circuit.After necking down produces, can suitably reduce the rate of climb of electric current.Along with electric current is increasing, and the diameter of fluid column constantly dwindles.To t4 constantly, welding current rises to very high, and that the fluid column diameter is reduced to is very little, and this fluid column is called as short circuit later stage foot bridge.Now very large electric current flows through very thin fluid column, will cause short circuit later stage foot bridge to occur quick-fried disconnected, and generation is splashed.When short circuit later stage foot bridge being detected and produce, again reduce rapidly electric current, as shown in t4 in figure, also can avoid the generation of splashing.After short circuit later stage foot bridge is pulled off under capillary effect, electric arc is set up again, and now electric current is very little, but voltage rises rapidly, as shown in t5 in figure.Need afterwards to increase rapidly electric current, guarantee that electric arc has enough energy, as shown in t6 in figure.Start afterwards next shorted period.Can find out from Fig. 1 a-Fig. 1 c, in the stage of twice short circuit foot bridge formation, if electric current is larger, all easily produces and splash.
Proper timing in short circuit initial stage foot bridge and the foot bridge generation of short circuit later stage reduces rapidly welding current, can effectively reduce and splash theoretically, but realize that difficulty is larger.
This is due in the major loop of the source of welding current, and in order to suppress the big ups and downs of electric current, a filter inductance often needs to connect.In high frequency switch power, this inductance value is about tens of microhenrys, and, in the industrial frequency rectifying circuit, this inductance value is up to microhenrys up to a hundred or hundreds of.The structure chart that circuit is a kind of normal welding electric power main circuit as shown in Figure 2, filter inductance is connected in the output loop of direct voltage source.In welding process, when short circuit occurs, the equiva lent impedance of whole major loop is very little, is about 0.01-0.05 Europe.And the inductance value of output inductor is generally more than 30 microhenrys, so time constant is more than 600 microseconds.This time is a long time with respect to short circuiting transfer, under such major loop, the accurate control that realizes short circuit current be do not have possible.
Solve at present the major way of power supply dynamic property as shown in Figure 3.This is a kind of source of welding current main circuit that can change the loop time constant.The end of the positive output termination output inductor L of voltage follower circuit, the end of the two termination power resistor R of output inductor L and the colelctor electrode C utmost point of current switching power switch pipe Q2, the emitter E of two ends of power resistor R and power switched switching tube Q2 is connected as the positive output end of the source of welding current, external welding wire.The negative output terminal of voltage follower circuit is as the negative output terminal of power supply, external welding base metal.When arc burning, as shown in t1 in Fig. 1 a-Fig. 1 c, current switching power switch pipe Q2 conducting, power resistor R is by short circuit.After short circuit occurs, as the t2 moment in Fig. 1 a-Fig. 1 c, current switching power switch pipe Q2 turn-offs, the now impedance in loop is mainly determined by power resistor R, its resistance is generally more than 1 Europe, so the time constant in loop is reduced to tens of microseconds, power supply has enough dynamic response performances, electric current can be reduced to below about 40A very soon, and this electric current can be avoided the generation of splashing.After weld pool surface is sprawled, as shown in t3 in Fig. 1 a-Fig. 1 c, again open current switching power switch pipe Q2 when molten drop, now the output voltage of regulation voltage output circuit (1) can make short circuit current rise rapidly.When short circuit later stage foot bridge being detected, produce, when will be quick-fried disconnected, cut-off current power switched switching tube Q2 again, as shown in t4 in Fig. 1 a-Fig. 1 c, electric current descends rapidly again.When foot bridge is broken by surface tension, after electric arc is set up again, open current switching power switch pipe Q2, the output voltage of regulation voltage output circuit (1) can make electric current rise rapidly, for electric arc provides suitable energy, as shown in t6 in Fig. 1 a-Fig. 1 c, thereby start next cycle.In this circuit, due to the power resistor R that connected in loop, can significantly reduce the time constant of circuit, thereby realize the accurate control to electric current.But in this circuit,, when needs reduce electric current, the energy of filter inductance L almost all consumes on power resistor R, the power consumption of this resistance is very large.The more important thing is, because short circuit later stage electric current is very large, for example, while using diameter to be 1.2 millimeters solid core welding wires, short circuit peak is about the 550A left and right, what now power switched switching tube Q2 turn-offed is instantaneous, the resistance of power resistor R of take is calculated as 1 Europe, and its transient power reaches more than 300 kilowatts, and trouble free service can be very difficult.If the volume of undue increasing power resistance R, may cause again its equivalent inductive reactance excessive and affect the trouble free service of current switching power switch pipe Q2.And because the energy of filter inductance L almost completely consumes, when needs increase electric current rapidly, inductive current need to start from very low numerical value to rise, and may cause causing not in time current interruption because arc energy supplements.
Summary of the invention
The object of the invention is to: solve in the circuit time constant handoff procedure problem that the series resistance power consumption is excessive; Further improve the dynamic response performance of power supply.By changing on the electric power main circuit basis of loop time constant, increase an energy reserving loop, for the energy of filter inductance L provides a new flow cycle.When needs reduce electric power outputting current rapidly, the present invention does not need to reduce the electric current in inductance, but it is branched to other loop, so both can within the shortest time, reduce electric power outputting current, the power consumption that can reduce again to connect on power resistor R, the security of resistance R is improved significantly.Because the energy loss in filter inductance L is less, when power supply need to increase output current, by output loop impedance switching, can make the electric current of filter inductance L directly export from power supply, the rate of climb of electric power outputting current can reach 50 peaces/microsecond, has greatly improved dynamic response performance.
The present invention adopts following technological means to realize:
A kind of welding supply with energy reserving loop comprises: adjustable voltage output circuit (1), power switch pipe Q1 drive circuit (3), current switching power switch pipe Q2 drive circuit (4), source current feedback filtering circuit (6), supply voltage feedback filtering circuit (7), core control circuit (8), man-machine interaction circuit (9) is characterized in that also being provided with the source of welding current main circuit (2) with energy reserving loop, the described source of welding current main circuit (2) with energy reserving loop comprises energy reserving power switch pipe Q1, energy reserving diode D1, output inductor L, current switching power switch pipe Q2, with power resistor R, the end of output inductor L extremely is connected with the emitter E of energy reserving power switch pipe Q1, the colelctor electrode C utmost point of Q1 extremely is connected with the negative electrode K of energy reserving diode D1, the anode A utmost point of two ends of output inductor L and energy reserving diode D1, the end of power resistor R, and the colelctor electrode C of current switching power switch pipe Q2 is extremely connected, two ends of power resistor R extremely are connected with the emitter E of current switching power switch pipe Q2, this end is as the output of circuit (2), external welding wire, an output of described adjustable voltage output circuit (1) extremely is connected with the emitter E of the energy reserving power switch pipe Q1 of source of welding current main circuit (2), and another output connects mother metal, and welding arc builds between welding wire and mother metal.Adjustable voltage output circuit (1) provides adjustable voltage to source of welding current main circuit (2), the base stage of energy reserving power switch pipe Q1 in described source of welding current main circuit (2) is connected with power switch pipe Q1 drive circuit (3), controlled by power switch pipe Q1 drive circuit (3), the base stage of current switching power switch pipe Q2 is connected with current switching power switch pipe Q2 drive circuit (4), controlled by current switching power switch pipe Q2 drive circuit (4); Described source current feedback filtering circuit (6) is for to flowing through the current feedback signal filtering of arc load, and is sent to core control circuit (8); Described supply voltage feedback filtering circuit (7) is for to the filtering of arc load voltage feedback signal, and is sent to core control circuit (8); Energy reserving power switch pipe Q1 in core control circuit (8) control source of welding current main circuit (2) and the break-make of current switching power switch pipe Q2, described man-machine interaction circuit (9) is for setup parameter.
The output voltage range of described adjustable voltage output circuit (1) is 0V-85V, and output current scope is 10-650A.
A kind of source of welding current control method with energy reserving loop specifically comprises:
When short circuit later stage foot bridge forms, cut-off current power switched switching tube Q2 opens energy reserving power switch pipe Q1 simultaneously;
When the short circuit later stage, foot bridge was pulled off, open current switching power switch pipe Q2, turn-off energy reserving power switch pipe Q1.
When short circuit initial stage foot bridge forms, cut-off current power switched switching tube Q2 opens energy reserving power switch pipe Q1 simultaneously;
When the short circuit initial stage, foot bridge formed rear t millisecond, 0<t<1.5, open current switching power switch pipe Q2, turn-offs energy reserving power switch pipe Q1 simultaneously.
Welding process is a cyclic process be comprised of arc burning stage, short-circuit stage, arc burning stage.In the process of short-circuit stage, arranged two important moment by the arc burning stage, be exactly the formation of short circuit initial stage foot bridge constantly, and short circuit initial stage foot bridge forms t(ms constantly) after, 0<t<1.5.The moment formed at short circuit initial stage foot bridge, if it is larger to flow through the electric current of short circuit initial stage foot bridge, easily cause quick-fried breaking, thereby produce, splash, so need to constantly reduce rapidly welding current at this, avoid short circuit initial stage foot bridge quick-fried disconnected, suppress to splash generation.Because short circuit initial stage electric current reduces, cause the electromagnetic contractile force deficiency, so as short circuit initial stage foot bridge formation moment t(ms) after, after molten drop is sprawled in molten bath, should increase rapidly electric current, impel necking down to produce, prevent the appearance of solid short circuit.Also have two important moment by short-circuit stage in the process in arc burning stage, i.e. the formation of short circuit later stage foot bridge constantly, and moment of being pulled off of short circuit later stage foot bridge.When short circuit later stage foot bridge being detected and produce, reduce rapidly electric current, can avoid the generation of splashing.After short circuit later stage foot bridge is pulled off under capillary effect, electric arc is set up again, and now electric current is very little, needs to increase rapidly electric current, guarantees that electric arc has enough energy.
A kind of welding supply with energy reserving loop, comprise voltage follower circuit (11), power switch pipe Q1 drive circuit (3), current switching power switch pipe Q2 drive circuit (4), source current feedback filtering circuit (6), supply voltage feedback filtering circuit (7), core control circuit (8), man-machine interaction circuit (9), inductor current feedback filter circuit (10), characterized by further comprising the source of welding current main circuit (2) with energy reserving loop, the described source of welding current main circuit (2) with energy reserving loop comprises copped wave power switch pipe (Q1), fly-wheel diode (D2), energy reserving diode (D1), output inductor (L), current switching power switch pipe (Q2), with power resistor R.The colelctor electrode C of copped wave power switch pipe Q1 is connected with the negative electrode K of energy reserving diode D1, the emitter E of copped wave power switch pipe Q1 and the negative electrode K of sustained diode 2, and the end of output inductor L is connected, two ends of output inductor L and the end of power resistor R, the anode A of energy reserving diode D1, and the colelctor electrode C of current switching power switch pipe Q2 is connected, the other end of power resistor R is connected with the emitter E of current switching power switch pipe Q2, this end is as the positive output end of circuit (2), external welding wire; The negative output terminal of circuit (1) is connected with the anode A of sustained diode 2 in circuit (2), and this end while is as the output of circuit (2), external welding base metal; The colelctor electrode C of copped wave power switch pipe Q1 and the negative electrode K of energy reserving diode D1 in the positive output end connection circuit (2) of circuit (1); Source current feedback filtering circuit (6) is for to flowing through the current feedback signal filtering of arc load, and is sent to core control circuit (8); Supply voltage feedback filtering circuit (7) is for the output voltage feedback signal filtering to circuit (2), and is sent to core control circuit (8); Inductor current feedback filter circuit (10) is for to flowing through the current feedback signal filtering of output inductor (L), and is sent to core control circuit (8); Copped wave power switch pipe Q1 in core control circuit (8) control source of welding current main circuit (2) and the break-make of current switching power switch pipe Q2, described man-machine interaction circuit (9) is for setup parameter.
The output voltage range of described voltage follower circuit (11) is 14V-85V, and output current scope is 10-650A.
A kind of source of welding current control method with energy reserving loop specifically comprises:
When short circuit later stage foot bridge forms, cut-off current power switched switching tube Q2, copped wave power switch pipe Q1 controls the electric current that flows through filter inductance L;
When short circuit later stage foot bridge is stretch-broken between short circuit initial stage foot bridge forms again, open current switching power switch pipe Q2, copped wave power switch pipe Q1 controls the decrease speed of arcing current.
When short circuit initial stage foot bridge forms, cut-off current power switched switching tube Q2 opens copped wave power switch pipe Q1 simultaneously;
T millisecond after the short circuit initial stage, foot bridge formed, 0<t<1.5, between forming to short circuit later stage foot bridge, open current switching power switch pipe Q2, and copped wave power switch pipe Q1 controls the rate of climb of short circuit current.
In the present invention, when current switching power switch pipe Q2 opens or turn-offs, the rising of load current and decrease speed are all much larger than conventional variable time constant chopper circuit.
Beneficial effect
Supply unit of the present invention, when needs reduce output current rapidly, electric current in output inductor L is bypassed to other loop, rather than as conventional variable time constant electric power main circuit, inductance energy consumption on series connection power resistor R, so the loss of power resistor R significantly reduces, the voltage peak on current switching power switch pipe Q2 also reduces thereupon, has improved the reliability of series connection power resistor R and current switching power switch pipe Q2.In addition, because rapid rising and the decline of load current are switched realization by circuit, so speed is very fast, this time is equal to the switching speed of power switched switching tube Q2 substantially, so the dynamic property of power supply increases substantially.The curent change speed of conventional variable time constant electric power main circuit is in 10 peaces/microsecond left and right, and curent change speed of the present invention can reach 50 peaces/more than microsecond.
The accompanying drawing explanation
Fig. 1 a-c is desirable short circuit current voltage waveform and droplet transfer process schematic diagram
The desired voltage waveform that wherein Fig. 1 a is short circuiting transfer,
The ideal current waveform that Fig. 1 b is short circuiting transfer,
Fig. 1 c is desirable short circuit transition droplet transfer process schematic diagram.
Fig. 2 is the normal welding electric power main circuit;
Fig. 3 is for changing the source of welding current main circuit of loop time constant;
The entire system structure chart that Fig. 4 is the first embodiment;
The fundamental diagram that Fig. 5 a-f is the first embodiment
Wherein Fig. 5 a is power switch pipe Q2 conducting, and Q1 turn-offs, Q3, Q5 conducting, Q4, current loop when Q6 turn-offs
Fig. 5 b is power switch pipe Q2 conducting, and Q1 turn-offs, Q3, Q5, Q4, current loop when Q6 turn-offs
Fig. 5 c is power switch pipe Q2 conducting, and Q1 turn-offs, Q3, and Q5 turn-offs, Q4, the current loop during Q6 conducting
Fig. 5 d is that inductive current is larger, and Q2 turn-offs, the Q1 conducting, and Q3, Q5 turn-offs, Q4, current loop during the Q6 conducting
Fig. 5 e is that inductive current is less, and Q2 turn-offs, the Q1 conducting, and Q3, Q5 turn-offs, Q4, current loop during the Q6 conducting
Fig. 5 f is that power switch pipe Q2 turn-offs, Q1 conducting, Q3, Q5, Q4, current loop when Q6 turn-offs
Fig. 6 is a kind of chopper-type adjustable voltage output circuit based on Industrial Frequency Transformer
Fig. 7 is a kind of chopper-type adjustable voltage output circuit based on generator
Fig. 8 is a kind of adjustable voltage output circuit based on the thyristor rectifier rectifier
Fig. 9 is a kind of adjustable voltage output circuit based on generator
Figure 10 is a kind of adjustable voltage output circuit based on the tap Industrial Frequency Transformer
The entire system mechanism map that Figure 11 is the second embodiment
The fundamental diagram that Figure 12 a-d is the second embodiment
Wherein Figure 12 a is power switch pipe Q2 conducting, and Q1 is the current loop of conducting also
Figure 12 b is power switch pipe Q2 conducting, the current loop that Q1 turn-offs
Figure 12 c is that power switch pipe Q2 turn-offs, the current loop of Q1 conducting
Figure 12 d is that power switch pipe Q2 turn-offs, the current loop that Q1 also turn-offs
Figure 13 is the first technical scheme theory diagram of the present invention.
Fig. 2, in 3,4,5,7,8,9,10,11,12,13: Q1, Q2, Q3, Q4, Q5, Q6---power switch pipe, D1, D2, D3---diode, L---filter inductance, R---power resistor.TR---Industrial Frequency Transformer, TRH---intermediate-frequency transformer, Fig. 4, in 12: LEM1---voltage sensor, LEM2, LEM3---current sensor, (1) adjustable voltage output circuit, (2) there is the source of welding current main circuit in energy reserving loop, (3) power switch pipe Q1 drive circuit, (4) current switching power switch pipe Q2 drive circuit, (5) voltage follower circuit power switch tube drives circuit, (6) source current feedback filtering circuit, (7) supply voltage feedback filtering circuit, (8) core control circuit, (9) man-machine interaction circuit, (10) inductor current feedback filter circuit, (11) voltage follower circuit.
The specific embodiment
Embodiment one:
Be illustrated in figure 4 the system construction drawing of embodiment of the present invention one, below in conjunction with accompanying drawing and specific embodiments, the present invention is described in further detail: adjustable voltage output circuit (1), power switch pipe Q1 drive circuit (3), current switching power switch pipe Q2 drive circuit (4), voltage follower circuit power switch tube drives circuit (5), source current feedback filtering circuit (6) in the present invention, supply voltage feedback filtering circuit (7), core control circuit (8), man-machine interaction circuit (9) belong to prior art.Described adjustable voltage output circuit (1) is by three-phase commutation bridge BR, input filter capacitor C, and voltage follower circuit power switch pipe Q3, Q4, Q5, Q6, intermediate-frequency transformer TRH, commutation diode D2, D3 forms.Adjustable voltage output circuit (1) be as long as can export the DC voltage of 0-85V, according to the requirement difference of welder power, and the maximum 650A of output current capacity.This circuit can pass through the acquisitions such as half-bridge inversion circuit, push-pull inverter circuit, or single-ended inverter circuit equally; Also can adopt the voltage follower circuit of chopper-type voltage follower circuit, the chopper-type voltage follower circuit based on generator, the voltage follower circuit based on silicon controlled rectifier, the voltage follower circuit based on generator or the Industrial Frequency Transformer based on tap based on Industrial Frequency Transformer etc.
The described source of welding current main circuit (2) with energy reserving loop is by energy reserving power switch pipe Q1, energy reserving diode D1, and output inductor L, power resistor R, current switching power switch pipe Q2 forms.Because energy reserving power switch pipe Q1 generally adopts high-power insulated gate gate pole bipolar transistor (IGBT), diode of this kind of general inner reverse parallel connection of device, so need an energy reserving diode D1 of series connection in circuit, its effect is to prevent the reverse flow mistake of electric current from energy reserving power switch pipe Q1.If energy reserving power switch pipe Q1 adopts other high power device, can avoid reverse-conducting, herein can be without energy reserving diode D1.
There is welding supply embodiment mono-system in energy reserving loop as shown in Figure 4.The U of three-phase alternating current, V, the W three-phase is connected to respectively three input one ends, two ends of three-phase commutation bridge BR, and three ends.The colelctor electrode C end of an end, adjustable voltage output circuit (1) power switch pipe Q3 and the Q6 of the positive output end four termination input filter capacitor C of three-phase commutation bridge BR.The negative output terminal five terminal of three-phase commutation bridge BR connects the emitter E utmost point of two ends, adjustable voltage output circuit (1) power switch pipe Q4 and the Q5 of filter capacitor C.Input one end of the emitter E utmost point of adjustable voltage output circuit (1) power switch pipe Q3 and the colelctor electrode C utmost point of Q4, intermediate-frequency transformer TRH is connected.Input two ends of the colelctor electrode C utmost point of adjustable voltage output circuit (1) power switch pipe Q5 and the emitter E utmost point of Q6, intermediate-frequency transformer TRH are connected.Output three ends of intermediate-frequency transformer TRH extremely are connected with the anode A of commutation diode D2, the output five terminal of intermediate-frequency transformer TRH extremely is connected with the anode A of commutation diode D3, the negative electrode of commutation diode D2 and D3 is connected, this terminal, as the positive output end of adjustable voltage output circuit (1), connects the end of the output inductor L in the source of welding current main circuit (2) with energy reserving loop and the emitter E utmost point of energy reserving power switch pipe Q1.The colelctor electrode C utmost point of energy reserving power switch pipe Q1 extremely is connected with the negative electrode K of energy reserving diode D1.The anode A utmost point of two ends of output inductor L and energy reserving diode D1, the end of power resistor R extremely is connected with the colelctor electrode C of current switching power switch pipe Q2.Two ends of power resistor R extremely are connected with the emitter E of current switching power switch pipe Q2, and this end is as the positive output end of circuit (2), external welding wire.Centre cap output four ends of intermediate-frequency transformer secondary are as the negative output terminal of circuit (1), simultaneously also as the negative output terminal of circuit (2), and external welding base metal.An end and three ends of intermediate-frequency transformer TRH are Same Name of Ends.
Power switch pipe Q1 drive circuit (3) is comprised of IGBT special driving chip M57962, current switching power switch pipe Q2 drive circuit (4) is comprised of IGBT special driving chip M57962, source current feedback filtering circuit (6) is comprised of low pass filter, supply voltage feedback filtering circuit (7) is comprised of low pass filter, core control circuit (8) is comprised of PIC30f2020 etc., and man-machine interaction circuit (9) is by display circuit and the electric circuit constitutes such as keyboard, encoder such as conventional LED or LCD.Below in conjunction with the droplet transfer process of short circuit transition, the course of work of power supply is described.
In adjustable voltage output circuit (1), power switch pipe Q3, Q5 conducting simultaneously, power switch pipe Q4, Q6 conducting simultaneously.The conducting of Q3, Q5 and Q4, Q6 is constantly anti-phase, phase phasic difference 180 degree.By controlling the turn-on and turn-off of adjustable voltage output circuit (1) power switch pipe, regulate the output voltage of adjustable voltage output circuit (1), thereby the size of regulating load electric current makes it according to desirable wave form varies.In short circuit transition, load voltage is judgement short circuit whether key index.Generally, when load voltage is greater than certain critical value, think that welding process is in the arcing state, when load voltage is worth lower than this, think that welding process is in short-circuit condition.According to the difference of welding average current, the critical value of judgement short-circuit voltage is generally between 10-20V.
When welding process, during in the arcing state, now arc voltage judges critical voltage higher than short circuit.Welding process is in arc stage, and now energy reserving power switch pipe Q1 turn-offs, current switching power switch pipe Q2 conducting.Because the conduction voltage drop of current switching power switch pipe Q2 is lower, can ignore, so now the operation principle of power supply is identical with the conventional full bridge inverter circuit.
During the arcing state, as adjustable voltage output circuit (1) switching tube Q3, the Q5 conducting, Q4, when Q6 turn-offs, as shown in Fig. 5 (a).Intermediate-frequency transformer TRH primary current flows out from positive output end four ends of three-phase commutation bridge BR, through power switch pipe Q3, from former limit one end of intermediate-frequency transformer TRH, flow into, from former limit two ends, flow out, through power switch pipe Q5, finally from the negative terminal five terminal of three-phase commutation bridge BR, flow back to.The secondary current of intermediate-frequency transformer TRH flows out from three ends, through commutation diode D2, and output inductor L, current switching power switch pipe Q2, through the welding arc load, finally enter centre cap four ends of intermediate-frequency transformer TRH.
When adjustable voltage output circuit (1) switching tube all turn-offs, as shown in Fig. 5 (b).Intermediate-frequency transformer TRH primary current is zero, the output inductor L output energy of secondary, electric current flows out from two ends of output inductor L, through current switching power switch pipe Q2, through arc load, enter the centre cap of intermediate-frequency transformer TRH secondary, through commutation diode D2 and D3 afterflow, finally flow back to the end of filter inductance L.
As adjustable voltage output circuit (1) switching tube Q4, the Q6 conducting, Q3, when Q5 turn-offs, as shown in Fig. 5 (c).Intermediate-frequency transformer TRH primary current flows out from positive output end four ends of three-phase commutation bridge BR, through power switch pipe Q6, from former limit two ends of intermediate-frequency transformer TRH, flow into, from former limit one end, flow out, through power switch pipe Q4, finally from the negative terminal five terminal of three-phase commutation bridge BR, flow back to.The secondary current of intermediate-frequency transformer TRH flows out from five terminal, through commutation diode D3, and filter inductance L, current switching power switch pipe Q2, through the welding arc load, finally enter centre cap four ends of intermediate-frequency transformer TRH.
From above process, can find out, when energy reserving power switch pipe Q1 turn-offs, current switching power switch pipe Q2 conducting phase, the operation principle of the operation principle of this circuit and conventional full bridge inverter is identical.If the crest voltage of intermediate-frequency transformer TRH secondary is US, when the power switch pipe conducting on former limit, adjustable voltage output circuit (1) output dc voltage US, when former limit power switch pipe turn-offs, adjustable voltage output circuit (1) output voltage is zero.
When molten drop and molten bath are short-circuited, load voltage sharply descends, and lower than short circuit judgement critical value, thinks that short circuit initial stage foot bridge forms, and now cut-off current power switched switching tube Q2 opens energy reserving power switch pipe Q1 simultaneously.When adjustable voltage output circuit (1) power switch pipe conducting, the voltage that adjustable voltage output circuit (1) output amplitude is US, there is an electric current part in the source of welding current main circuit (2) in the energy reserving loop power resistor R that flows through, its current amplitude is US/R, remainder flows through energy reserving diode D1 and energy reserving power switch pipe Q1, and its current loop is as shown in Fig. 5 (d).Because the pressure drop of energy reserving diode D1 and energy reserving power switch pipe Q1 is lower, so in filter inductance, the energy of L is kept, rather than consume by power resistor R.If it is less now to flow through the electric current of inductance, be less than US/R, current loop is as shown in Figure 5 (e) shows.When adjustable voltage output circuit (1) power switch pipe turn-offs, intermediate-frequency transformer TRH and filter inductance L can not export energy, and the output current of power supply is zero.Its current loop is as Fig. 5 (f).
When the short circuit initial stage, foot bridge formed rear t millisecond, 0<t<1.5ms.Molten drop is sprawled at weld pool surface, needs rapid increase of weld current.Now open current switching power switch pipe Q2, turn-off energy reserving power switch pipe Q1.By controlling the turn-on and turn-off of power switch pipe in adjustable voltage output circuit (1), can control the rate of climb of short circuit current.The power work principle in this stage is with the operation principle of conventional full bridge inverter.Its current loop is as (a) in Fig. 5, (b), or (c).
When short circuit later stage foot bridge forms, now short-circuit process closes to an end.The detection of this state adopts prior art, can, by the differential signal judgement of test weld load voltage, also can pass through the differential signal judgement of test load impedance.For fear of the generation of splashing greatly, should reduce rapidly short circuit current.Now cut-off current power switched switching tube Q2, open energy reserving power switch pipe Q1.Because short circuit later stage electric current is larger, when adjustable voltage output circuit (1) power switch pipe conducting, the voltage that adjustable voltage output circuit (1) output amplitude is US, an electric current part in the output inductor L power resistor R that flows through, its current amplitude is US/R, remainder flows through energy reserving diode D1 and energy reserving power switch pipe Q1, and its current loop is as shown in Fig. 5 (d).Because the pressure drop of energy reserving diode D1 and energy reserving power switch pipe Q1 is lower, so the energy in filter inductance L is kept, rather than by power resistor R, consume fully.When adjustable voltage output circuit (1) power switch pipe turn-offs, intermediate-frequency transformer TRH and filter inductance L can not export energy, and the output current of power supply is zero.Its current loop is as Fig. 5 (f).
When the short circuit foot bridge is pulled off under capillary effect, the Rule of judgment of this state is that load voltage is greater than short circuit judgement critical voltage, turn-offs energy reserving power switch pipe Q1, opens current switching power switch pipe Q2.Then start a new cycle.
In the present invention, when current switching power switch pipe Q2 opens or turn-offs, the rising of the output current of supply unit of the present invention and decrease speed are all much larger than conventional variable time constant chopper circuit
The output voltage range of adjustable voltage output circuit (1) is 0V-85V, and the average voltage scope is 0-45V, and output current scope is 10-650A.The resistance of power resistor R is 1-3 Europe.
As shown in Figure 4, LEM1 is isolated voltage sensor, is parallel to the output of circuit (2), for detection of the output voltage values of circuit (2).If the length of outside weldings cable is very long, this sensor can directly be parallel on the welding circuit parts nearest apart from welding arc.Supply voltage feedback filtering circuit (7) is positioned between LEM1 and core control circuit (8).LEM2 is isolated current sensor, for detection of electric power outputting current.Source current feedback filtering circuit (6) is positioned between LEM2 and core control circuit (8).Power switch pipe Q1 drive circuit (3) is positioned between core control circuit (8) and energy reserving power switch pipe Q1, and current switching power switch pipe Q2 drive circuit (4) is positioned between core control circuit (8) and current switching power switch pipe Q2.Core control circuit (8) is connected with man-machine interaction circuit (9), for the output parameter of power supply is set.
Adopt pulse width modulation (Pluse Width Modulation in the present embodiment, be called for short PWM) control technology, control adjustable voltage output circuit (1) power switch pipe Q3, Q4 by voltage follower circuit power switch tube drives circuit (5), Q5, the conducting of Q6 and shutoff.By adjusting pulse duty factor, can control the output current in welding process.Control conducting and the shutoff of current switching power switch pipe Q2 and energy reserving power switch pipe Q1, impedance that can the Switching power loop, reach the purpose that changes the power supply dynamic property.
In the course of the work, voltage sensor LEM1 is sampled to the output voltage of circuit (2), and current sensor LEM2 is sampled to the output current of circuit (2).Give core control circuit (8) by sampled result, core control circuit (8) compares respectively computing by the parameter of sampled result and man-machine interaction circuit (9) setting, transmission of signal is to voltage follower circuit power switch tube drives circuit (5), power switch pipe Q1 drive circuit (3), current switching power switch pipe Q2 drive circuit (4), the turn-on and turn-off of regulating power switching tube Q1, Q2, Q3, Q4, Q5, Q6, finally realize that output current and voltage parameter equate with man-machine switched circuit (9) setting value respectively respectively.
In overall structure figure shown in Fig. 4, adjustable voltage output circuit (1) also can adopt the chopper-type circuit based on Industrial Frequency Transformer as shown in Figure 6.The U of three-phase electricity, V, W connects respectively three input one ends of three-phase main-frequency transformer TR, two ends, and three ends.Three output four ends of three-phase main-frequency transformer TR, five terminal, and six ends connect respectively three input one ends of three-phase commutation bridge BR, two ends, and three ends.The end of the positive output end four termination filter capacitor C of three-phase commutation bridge BR and the colelctor electrode C of power switch pipe Q3 end.Power switch pipe Q3 now plays the effect that copped wave is controlled.The emitter E end of power switch pipe Q3 is connected with the negative electrode K of sustained diode 2 end.This end is as the positive output end of adjustable voltage output circuit (1), with the emitter E of energy reserving power switch pipe Q1 in the source of welding current main circuit (2) that has the energy reserving loop in Fig. 4 and the end of filter inductance L, is connected.Two ends of the negative output terminal of three-phase commutation bridge BR and filter capacitor C, the anode A of sustained diode 2 is extremely connected, and this end is as the negative output terminal of adjustable voltage output circuit (1), and the while is as the negative output terminal of circuit in Fig. 4 (2).The function of the adjustable voltage output circuit (1) shown in the adjustable voltage output circuit shown in Fig. 6 and Fig. 4 is identical, the output current that is control circuit in Fig. 4 (2) is distinguished in its control need to control power switch pipe Q3 in adjustable voltage output circuit (1), Q4, the turn-on and turn-off of Q5 and Q6.And, in Fig. 6, only need the turn-on and turn-off of power ratio control switching tube Q3 to get final product.
In overall structure figure shown in Fig. 4, adjustable voltage output circuit (1) also can adopt the chopper-type voltage follower circuit based on generator as shown in Figure 7.Three output one ends of generator MOTO, two ends, and three ends connect respectively three input one ends of three-phase commutation bridge BR, two ends, and three ends.The end of the positive output end four termination filter capacitor C of three-phase commutation bridge BR and the colelctor electrode C of power switch pipe Q3 end, power switch pipe Q3 now plays the effect that copped wave is controlled.The emitter E end of power switch pipe Q3 is connected with the negative electrode K of sustained diode 2 end, this end is as the positive output end of adjustable voltage output circuit (1), with the emitter E utmost point of energy reserving power switch pipe Q1 in the electric power main circuit that has the energy reserving loop in Fig. 4 (2) and an end of filter inductance, is connected.Two ends of the negative output terminal of three-phase commutation bridge BR and filter capacitor C, the anode A of sustained diode 2 is extremely connected, and this end is as the negative output terminal of adjustable voltage output circuit (1), and the while is as the negative output terminal of circuit in Fig. 4 (2).The effect of the adjustable voltage output circuit (1) shown in the adjustable voltage output circuit shown in Fig. 7 and Fig. 4 is identical, the difference of its control is that the output current of control circuit in Fig. 4 (2) need to control power switch pipe Q3 in adjustable voltage output circuit (1), Q4, the turn-on and turn-off of Q5 and Q6.And, in Fig. 7, only need the turn-on and turn-off of power ratio control switching tube Q3 to get final product.
In overall structure figure shown in Fig. 4, adjustable voltage output circuit (1) also can adopt the voltage follower circuit based on silicon controlled rectifier as shown in Figure 8.The U of three-phase electricity, V, W connects respectively three input one ends of three-phase main-frequency transformer TR, two ends, and three ends.Three output four ends of three-phase main-frequency transformer TR, five terminal, and six ends connect respectively three input one ends of three-phase controlled thyristor rectifier bridge BR, two ends, and three ends.The end of the positive output end four termination filter capacitor C of three-phase controlled thyristor rectifier bridge BR is connected.This end is as the positive output end of adjustable voltage output circuit (1), with the emitter E utmost point of energy reserving power switch pipe Q1 in the electric power main circuit that has the energy reserving loop in Fig. 4 (2) and an end of filter inductance, is connected.The negative output terminal of three-phase controlled thyristor rectifier bridge BR and two ends of filter capacitor C are connected, and this end is as the negative output terminal of adjustable voltage output circuit (1), and the while is as the negative output terminal of circuit in Fig. 4 (2).The effect of the adjustable voltage output circuit (1) shown in the adjustable voltage output circuit shown in Fig. 8 and Fig. 4 is basic identical, the difference of its control is that the output current of control circuit in Fig. 4 (2) need to control power switch pipe Q3 in adjustable voltage output circuit (1), Q4, the turn-on and turn-off of Q5 and Q6.And, in Fig. 8, control the output voltage of voltage follower circuit by the angle of flow of controlling IGCT, this voltage is the average voltage of electric arc in welding process.Current rise decrease speed in welding process is determined by the induction reactance value of filter inductance L.Identical in the control of energy reserving power switch pipe Q1 and current switching power switch pipe Q2 and Fig. 4.
In overall structure figure shown in Fig. 4, adjustable voltage output circuit (1) also can adopt the voltage follower circuit based on generator as shown in Figure 9.Three output one ends of generator MOTO, two ends, and three ends connect respectively three input one ends of three-phase commutation bridge BR, two ends, and three ends.The end of the positive output end four termination filter capacitor C of three-phase commutation bridge BR is connected.This end is as the positive output end of adjustable voltage output circuit, with the long-pending E utmost point of emission of energy reserving power switch pipe Q1 in the electric power main circuit that has the energy reserving loop in Fig. 4 (2) and the end of filter inductance L, is connected.Two ends of the negative output terminal of three-phase commutation bridge BR and filter capacitor C are connected, and this end is as the negative output terminal of adjustable voltage output circuit (1), and the while is as the negative output terminal of circuit in Fig. 4 (2).The effect of the adjustable voltage output circuit (1) shown in the adjustable voltage output circuit shown in Fig. 9 and Fig. 4 is basic identical, the difference of its control is that the output current of control circuit in Fig. 4 (2) need to control power switch pipe Q3 in adjustable voltage output circuit (1), Q4, the turn-on and turn-off of Q5 and Q6.And, in Fig. 9, by the output voltage of adjusting generator MOTO, realize.Current rise decrease speed in welding process is determined by the induction reactance value of filter inductance L.Identical in the control of energy reserving power switch pipe Q1 and current switching power switch pipe Q2 and Fig. 4.
In overall structure figure shown in Fig. 4, adjustable voltage output circuit (1) also can adopt the voltage follower circuit of the Industrial Frequency Transformer based on tap as shown in figure 10.The U of three-phase electricity, V, W is connected to respectively three input one ends of three-phase main-frequency transformer TR, two ends, and three ends.Three output four ends of three-phase main-frequency transformer TR, five terminal, and six ends connect respectively three input one ends of three-phase commutation bridge BR, two ends, and three ends.The end of the positive output end four termination filter capacitor C of three-phase commutation bridge BR is connected.This end is as the positive output end of adjustable voltage output circuit (1), with the emitter E utmost point of energy reserving power switch pipe Q1 in the electric power main circuit that has the energy reserving loop in Fig. 4 (2) and the end of filter inductance L, is connected.Two ends of the negative output terminal of three-phase commutation bridge BR and filter capacitor C are connected, and this end is as the negative output terminal of adjustable voltage output circuit (1), and the while is as the negative output terminal of circuit in Fig. 4 (2).
The effect of the adjustable voltage output circuit (1) shown in the adjustable voltage output circuit shown in Figure 10 and Fig. 4 is basic identical, the difference of its control is in Fig. 4 that the output current of controlling power supply need to control power switch pipe Q3 in adjustable voltage output circuit (1), Q4, the turn-on and turn-off of Q5 and Q6.And, in Figure 10, by the former limit number of turn of regulating three-phase transformer TR, realize.Current rise decrease speed in welding process is determined by the induction reactance value of filter inductance L.Identical in the control of energy reserving power switch pipe Q1 and current switching power switch pipe Q2 and Fig. 4.
Embodiment two:
A kind of welding supply with energy reserving function, its embodiment two system structure as shown in figure 11.This device comprises voltage follower circuit (11), power switch pipe Q1 drive circuit (3), current switching power switch pipe Q2 drive circuit (4), source current feedback filtering circuit (6), supply voltage feedback filtering circuit (7), core control circuit (8), man-machine interaction circuit (9), inductor current feedback filter circuit (10), also comprise the source of welding current main circuit (2) with energy reserving loop, the described source of welding current main circuit (2) with energy reserving loop comprises copped wave power switch pipe (Q1), fly-wheel diode (D2), energy reserving diode (D1), output inductor (L), current switching power switch pipe (Q2), with power resistor R.The colelctor electrode C of copped wave power switch pipe Q1 is connected with the negative electrode K of energy reserving diode D1, the emitter E of copped wave power switch pipe Q1 and the negative electrode K of sustained diode 2, and the end of output inductor L is connected, two ends of output inductor L and the end of power resistor R, the anode A of energy reserving diode D1, and the colelctor electrode C of current switching power switch pipe Q2 is connected, the other end of power resistor R is connected with the emitter E of current switching power switch pipe Q2, this end is as the positive output end of circuit (2), external welding wire; The negative output terminal of circuit (1) is connected with the anode A of sustained diode 2 in circuit (2), and this end while is as the negative output terminal of circuit (2), external welding base metal; The colelctor electrode C of copped wave power switch pipe Q1 in the positive output end connection circuit (2) of voltage follower circuit (11); Source current feedback filtering circuit (6) is for to flowing through the current feedback signal filtering of arc load, and is sent to core control circuit (8); Supply voltage feedback filtering circuit (7) is for the output voltage feedback signal filtering to circuit (2), and is sent to core control circuit (8); Inductor current feedback filter circuit (10) is for to flowing through the current feedback signal filtering on output inductor L, and is sent to core control circuit (8); Copped wave power switch pipe Q1 in core control circuit (8) control source of welding current main circuit (2) and the break-make of current switching power switch pipe Q2, described man-machine interaction circuit (9) is for setup parameter.
LEM1 is isolated voltage sensor, for detection of the magnitude of voltage of circuit (2) output.LEM1 detects the voltage feedback signal obtained and is input in core control circuit (8) after supply voltage feedback filtering circuit (7) is processed.LEM2 is isolated current sensor, for detection of the current value of circuit (2) output, flows through the current value of arc load.The current feedback signal that LEM2 detects enters in core control circuit (8) after source current feedback filtering circuit (6) is processed.LEM3 is isolated current sensor, for detection of flowing through current value in output inductor L.LEM3 detects the current feedback signal obtained and is input in core control circuit (8) after inductor current feedback filter circuit (10) is processed.Core control circuit (8) is controlled the turn-on and turn-off of copped wave power switch pipe Q1 by power switch pipe Q1 drive circuit (3), core control circuit (8) is controlled the turn-on and turn-off of power switched switching tube Q2 by current switching power switch pipe Q2 drive circuit (4).Core control circuit (8) is connected with man-machine interaction circuit (9), for the output parameter of power supply is set.
Voltage follower circuit in the present invention (11), power switch pipe Q1 drive circuit (3), current switching power switch pipe Q2 drive circuit (4), source current feedback filtering circuit (6), supply voltage feedback filtering circuit (7), core control circuit (8), man-machine interaction circuit (9), inductor current feedback filter circuit (10), belong to prior art.Wherein voltage follower circuit (11) needs only the energy output dc voltage, and guarantees that its voltage magnitude gets final product between 14-85V, according to the requirement difference of welder power, and the maximum 650A of output current capacity.This circuit can adopt AC transformer, after single-phase or the electric transformation of three-phase main-frequency, then exports after rectifying and wave-filtering; Also can pass through conventional inverter circuit, as full bridge inverter, half-bridge inversion circuit, single-ended inverter circuit etc., single-phase or the electric low-voltage DC that converts to of three-phase main-frequency be obtained; Can also adopt generator output AC electricity, export after rectifying and wave-filtering; Can also adopt powerful constant current or constant voltage source, output is set and is adjusted to maximum, then at output, coordinate capacitor filtering.Source current feedback filtering circuit (6) is comprised of low pass filter, power switch pipe Q1 drive circuit (3) is comprised of IGBT special driving chip M57962, inductor current feedback filter circuit (10) is comprised of low pass filter, current switching power switch pipe Q2 drive circuit (4) is comprised of IGBT special driving chip M57962, supply voltage feedback filtering circuit (7) is comprised of low pass filter, core control circuit (8) is comprised of PIC30f2020, man-machine interaction circuit (9) is by display circuit and keyboards such as conventional LED or LCD, the electric circuit constitutes such as encoder.
Operation principle of the present invention please refer to Figure 12 a-d.The operation principle of voltage follower circuit (11) is well-known, in order to express easily, in Figure 12 a-d, with " voltage source ", means voltage follower circuit (11).
In embodiment mono-, said, in short circuit transition, load voltage is judgement short circuit whether key index.Generally, when load voltage is greater than certain critical value, think that welding process is in the arcing state, when load voltage is worth lower than this, think that welding process is in short-circuit condition.According to the difference of welding average current, the critical value of judgement short-circuit voltage is generally between 10-20V.
When welding process, during in the arcing state, now arc voltage judges critical voltage higher than short circuit.Current switching power switch pipe Q2 keeps conducting.By controlling the turn-on and turn-off of copped wave power switch pipe Q1, size that can control circuit (2) output current.During due to the electric arc normal combustion, arc voltage generally can be higher than the output voltage of voltage source, so energy reserving diode D1 does not possess turn-on condition, power work principle now and conventional chopper circuit are identical.When Q1 pipe turn-on and turn-off, the current loop of circuit is respectively as Figure 12 a, shown in Figure 12 b.
When short circuit initial stage foot bridge forms, now molten drop and molten bath are short-circuited, and the output voltage of supply unit of the present invention is dragged down rapidly, lower than the critical voltage of short circuit judgement.In order to guarantee that molten drop can smoothly transit, current switching power switch pipe Q2 turn-offs, and copped wave power switch pipe Q1 conducting, make electric current remain on a lower value, and test shows can not produce and splash if electric current is less than 40A.Power resistor R is sealed in the major loop of power supply, and in inductance L, the part electric current flows through energy reserving diode D1.Because the adjustment of load current realizes by current switching, so its pace of change is very fast, the highest 50 peaces/more than microsecond of can reaching.
After short circuit initial stage foot bridge forms the t millisecond, 0<t<1.5, between forming to short circuit later stage foot bridge, open current switching power switch pipe Q2, and copped wave power switch pipe Q1 controls the rate of climb of short circuit current.This stage, molten drop is sprawled at weld pool surface, needs rapid increase of weld current, to promote necking down, produces, therefore current switching power switch pipe Q2 conducting, in addition by controlling the rate of climb of controlling short circuit current that turns on and off of copped wave power switch pipe Q1.Current loop is as shown in Figure 12 a and Figure 12 b.
When short circuit later stage foot bridge forms, short circuit current rises to a higher value.For fear of the generation of splashing, should reduce rapidly short circuit current.The detection that short circuit later stage foot bridge forms state adopts prior art, can judge by the differential signal of test weld load voltage, also can be by the differential signal judgement of test load impedance.Now turn-off power switched switch Q2, power resistor R is sealed in the power supply major loop.Copped wave power switch pipe Q1 controls the electric current that flows through filter inductance L.Because short circuit later stage electric current is larger, the current segment in inductance flows through power resistor R, and remainder flows through energy reserving diode D1.When copped wave power switch pipe Q1 opens, this electric current will flow back to inductance through copped wave power switch pipe Q1, and electric current remains unchanged substantially; When copped wave power switch pipe Q1 pipe closes, this electric current will flow back to inductance through voltage source and sustained diode 2, and now inductive current will descend.Current loop is as shown in Figure 12 c and Figure 12 d.
When short circuit later stage foot bridge is pulled off under capillary effect, electric arc re-establishes, and the relative short-circuit voltage of load voltage has obvious rising, higher than short circuit judgement critical voltage.Be stretch-broken between short circuit initial stage foot bridge forms again at short circuit later stage foot bridge, open current switching power switch pipe Q2, copped wave power switch pipe Q1 controls the decrease speed of arcing current.Enter afterwards next cycle period.
In the present embodiment, when current switching power switch pipe Q2 opens or turn-offs, flow through the rising of electric current of load and decrease speed all much larger than conventional variable time constant chopper circuit, maximum speed can reach 50 peaces/microsecond.
In the present embodiment, the output voltage range of voltage follower circuit is 14-85V.The resistance of series connection power resistor R is 1-3 Europe.The output current scope of power supply is 10-650A.
The present invention adopts pulse width modulation (Pluse Width Modulation is called for short PWM) control technology, controls conducting and the shutoff of copped wave power switch pipe Q1.Adjust dutycycle, can control the output current in welding process.Control conducting and the shutoff of current switching power switch pipe Q2, can change the time constant of electric power loop, reach the purpose that changes the power supply dynamic property.
In the course of the work, supply voltage sensor LEM1 is for the output voltage of feedback circuit (2), and source current sensor LEM2 is for the output current of feedback circuit (2), and inductive current sensor LEM3 crosses the electric current of inductance for feedback flow.After giving core control circuit (8) by feedback result, core control circuit (8) compares respectively computing by the parameter of feedback result and man-machine interaction circuit (9) setting, transmission of signal is to copped wave power switch pipe Q1 drive circuit (3) and current switching power switch pipe Q2 drive circuit (4), the turn-on and turn-off of regulating power switching tube Q1, Q2, finally realize that output current and voltage parameter equate with man-machine interaction circuit (9) setting value respectively respectively.
Claims (8)
1. the welding supply with energy reserving loop comprises: adjustable voltage output circuit (1), power switch pipe Q1 drive circuit (3), current switching power switch pipe Q2 drive circuit (4), source current feedback filtering circuit (6), supply voltage feedback filtering circuit (7), core control circuit (8), man-machine interaction circuit (9) is characterized in that also being provided with the source of welding current main circuit (2) with energy reserving loop; The described source of welding current main circuit (2) with energy reserving loop comprises energy reserving power switch pipe Q1, energy reserving diode D1, output inductor L, current switching power switch pipe Q2, and power resistor R; The end of output inductor L extremely is connected with the emitter E of energy reserving power switch pipe Q1, the colelctor electrode C utmost point of Q1 extremely is connected with the negative electrode K of energy reserving diode D1, the colelctor electrode C of the anode A utmost point of two ends of filter inductance L and energy reserving diode D1, the end of power resistor R and current switching power switch pipe Q2 extremely is connected, two ends of power resistor R extremely are connected with the emitter E of current switching power switch pipe Q2, this end is as the positive output end of circuit (2), external welding wire; An output of described adjustable voltage output circuit (1) extremely is connected with the emitter E of the energy reserving power switch pipe Q1 of source of welding current main circuit (2), and another output connects mother metal, and welding arc builds between welding wire and mother metal; Adjustable voltage output circuit (1) provides adjustable voltage to source of welding current main circuit (2), the base stage of energy reserving power switch pipe Q1 in described source of welding current main circuit (2) is connected with power switch pipe Q1 drive circuit (3), controlled by power switch pipe Q1 drive circuit (3), the base stage of current switching power switch pipe Q2 is connected with current switching power switch pipe Q2 drive circuit (4), controlled by current switching power switch pipe Q2 drive circuit (4); Described source current feedback filtering circuit (6) is for to flowing through the current feedback signal filtering of arc load, and is sent to core control circuit (8); Described supply voltage feedback filtering circuit (7) is for to the filtering of arc load voltage feedback signal, and is sent to core control circuit (8); Energy reserving power switch pipe Q1 in core control circuit (8) control source of welding current main circuit (2) and the break-make of current switching power switch pipe Q2, described man-machine interaction circuit (9) is for setup parameter.
2. a kind of welding supply with energy reserving loop according to claim 1 is characterized in that:
When short circuit later stage foot bridge forms, cut-off current power switched switching tube Q2 opens energy reserving power switch pipe Q1 simultaneously; When the short circuit later stage, foot bridge was pulled off, open current switching power switch pipe Q2, turn-off energy reserving power switch pipe Q1.
3. a kind of welding supply with energy reserving loop according to claim 1 is characterized in that:
When short circuit initial stage foot bridge forms, cut-off current power switched switching tube Q2 opens energy reserving power switch pipe Q1 simultaneously; When the short circuit initial stage, foot bridge formed rear t millisecond, 0<t<1.5, open current switching power switch pipe Q2, turn-offs energy reserving power switch pipe Q1 simultaneously.
4. a kind of welding supply with energy reserving loop according to claim 1, it is characterized in that: the output voltage range of described adjustable voltage output circuit (1) is 0V-85V, output current scope is 10-650A.
5. the welding supply with energy reserving loop, comprise voltage follower circuit (11), power switch pipe Q1 drive circuit (3), current switching power switch pipe Q2 drive circuit (4), source current feedback filtering circuit (6), supply voltage feedback filtering circuit (7), core control circuit (8), man-machine interaction circuit (9), inductor current feedback filter circuit (10), characterized by further comprising the source of welding current main circuit (2) with energy reserving loop, the described source of welding current main circuit (2) with energy reserving loop comprises copped wave power switch pipe Q1, sustained diode 2, energy reserving diode D1, output inductor L, current switching power switch pipe Q2, with power resistor R.The colelctor electrode C of copped wave power switch pipe Q1 is connected with the negative electrode K of energy reserving diode D1, the emitter E of copped wave power switch pipe Q1 and the negative electrode K of sustained diode 2, and the end of output inductor L is connected, two ends of output inductor L and the end of power resistor R, the anode A of energy reserving diode D1, and the colelctor electrode C of current switching power switch pipe Q2 is connected, the other end of power resistor R is connected with the emitter E of current switching power switch pipe Q2, this end is as the positive output end of circuit (2), external welding wire; The negative output terminal of circuit (1) is connected with the anode A of sustained diode 2 in circuit (2), and this end while is as the negative output terminal of circuit (2), external welding base metal.The colelctor electrode C of copped wave power switch pipe Q1 in the positive output end connection circuit (2) of voltage follower circuit (11); Source current feedback filtering circuit (6) is for to flowing through the current feedback signal filtering of arc load, and is sent to core control circuit (8); Supply voltage feedback filtering circuit (7) is for the output voltage feedback signal filtering to circuit (2), and is sent to core control circuit (8); Inductor current feedback filter circuit (10) is for to flowing through the current feedback signal filtering on output inductor (L), and is sent to core control circuit (8); Copped wave power switch pipe Q1 in core control circuit (8) control source of welding current main circuit (2) and the break-make of current switching power switch pipe Q2, described man-machine interaction circuit (9) is for setup parameter.
6. a kind of welding supply with energy reserving loop according to claim 5 is characterized in that:
When short circuit later stage foot bridge forms, cut-off current power switched switching tube Q2, copped wave power switch pipe Q1 controls the electric current that flows through filter inductance L; When short circuit later stage foot bridge is stretch-broken between short circuit initial stage foot bridge forms again, open current switching power switch pipe Q2, copped wave power switch pipe Q1 controls the decrease speed of arcing current.
7. a kind of welding supply with energy reserving loop according to claim 5 is characterized in that:
When short circuit initial stage foot bridge forms, cut-off current power switched switching tube Q2 opens copped wave power switch pipe Q1 simultaneously;
T millisecond after the short circuit initial stage, foot bridge formed, 0<t<1.5, between forming to short circuit later stage foot bridge, open current switching power switch pipe Q2, and copped wave power switch pipe Q1 controls the rate of climb of short circuit current.
8. a kind of welding supply with energy reserving loop according to claim 5, it is characterized in that: the output area of described voltage follower circuit (11) is 14V-85V, output current scope is 10-650A.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105798428A (en) * | 2016-05-20 | 2016-07-27 | 柳州职业技术学院 | Welding power supply device with low impact load |
| CN106513935A (en) * | 2016-12-30 | 2017-03-22 | 唐山松下产业机器有限公司 | Arcing state judgment method and device and electric arc welding device |
| CN111001902A (en) * | 2020-03-09 | 2020-04-14 | 杭州凯尔达电焊机有限公司 | Welding control circuit and alternating current welding power supply |
| CN114160925A (en) * | 2021-12-07 | 2022-03-11 | 深圳市麦格米特焊接技术有限公司 | Current blocking method and device, welding system and welding machine |
| CN117983929A (en) * | 2024-04-02 | 2024-05-07 | 杭州凯尔达焊接机器人股份有限公司 | Welding control circuit and welding power supply based on energy recovery transfer |
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| CN105798428A (en) * | 2016-05-20 | 2016-07-27 | 柳州职业技术学院 | Welding power supply device with low impact load |
| CN106513935A (en) * | 2016-12-30 | 2017-03-22 | 唐山松下产业机器有限公司 | Arcing state judgment method and device and electric arc welding device |
| CN111001902A (en) * | 2020-03-09 | 2020-04-14 | 杭州凯尔达电焊机有限公司 | Welding control circuit and alternating current welding power supply |
| CN111001902B (en) * | 2020-03-09 | 2020-07-07 | 杭州凯尔达电焊机有限公司 | Welding control circuit and alternating current welding power supply |
| CN114160925A (en) * | 2021-12-07 | 2022-03-11 | 深圳市麦格米特焊接技术有限公司 | Current blocking method and device, welding system and welding machine |
| CN117983929A (en) * | 2024-04-02 | 2024-05-07 | 杭州凯尔达焊接机器人股份有限公司 | Welding control circuit and welding power supply based on energy recovery transfer |
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