CN103182596B - Adaptive variable polarity plasma arc welding power supply - Google Patents
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- CN103182596B CN103182596B CN201310088763.1A CN201310088763A CN103182596B CN 103182596 B CN103182596 B CN 103182596B CN 201310088763 A CN201310088763 A CN 201310088763A CN 103182596 B CN103182596 B CN 103182596B
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Abstract
The invention discloses a variable polarity plasma arc welding power supply which can adapt to different voltage requirements of a direct current straight polarity arc and a direct current reverse polarity arc, and belongs to the field of material processing. Three-phase alternating current is input to a dual-output direct-current constant current power supply part; an output end of the dual-output direct-current constant current power supply part passes through a current transformer used for acquiring a current signal; an output end, subjected to sampling, of the current transformer is connected to a control unit; the control unit outputs a control signal to the dual-output direct-current constant current power supply part; an output end of the dual-output direct-current constant current power supply part is connected to a secondary inversion unit through coupling inductance; output of voltage, current and a temperature acquisition circuit in the secondary inversion unit is connected to the control unit, the control unit outputs a control signal, and the control signal is modulated through a secondary drive circuit to be conveyed to the secondary inversion unit. The variable polarity plasma arc welding power supply can be in operation in various modes, adapts to the different voltage requirements of the direct current straight polarity arc and the direct current reverse polarity arc, and meets the different welding process requirements.
Description
Technical field
The present invention is that one can adapt to straight polarity direct current (DCEN) and the variable polarity plasma arc welding power source of the different voltage requirements of DC reverse connection (DCEP) electric arc, belongs to material processing field.
Background technology
Plasma arc welding with adjustable polarity parameters (Variable polarity plasma arc welding is called for short VPPAW) i.e. asymmetrical square wave AC plasma arc welding is a kind of new and effective welding technique for Aluminum-aluminum alloy exploitation.It combine variable polarity TIG welding and plasma weldering advantage feature parameter can according to technological requirement flexibly, independently regulate the characteristic of the high-energy-density effectively utilizing plasma beam to have, high effluxvelocity, hard arc power, realize Aluminum Alloy Plate one side and once weld two-sided free forming; Because welding deformation is little, productivity ratio is high, as compared to other high energy beam current welding procedure (electron beam welding and Laser Welding), equipment is simple, cost is low and the defect such as pore, slag inclusion is few, be called as abroad " zero-fault " welding method, be successfully applied on the welding production of the products such as space shuttle external tank, be counted as the welding method in 21 century extensive application prospect simultaneously.
At present, variable-polarity plasma welding technology reaches its maturity, but still there is a lot of deficiency.As: variable-polarity plasma welding power supply is when Variable Polarity (interchange) is welded, requirement voltage when welding procedure works to straight polarity direct current (DCEN) is lower, requirement voltage when welding procedure works to DC reverse connection (DCEP) is higher, according to the method for traditional single power supply, when power supply secondary inverting switches between DC reverse connection (DCEP) and straight polarity direct current (DCEN) state, the dutycycle of the trigger impulse of front level power supply needs very large adjustment, this just requires that prime power supply has larger voltage regulation factor, but, general when Power Management Design, often can not take into account the operating voltage requirement of straight polarity direct current (DCEN) and DC reverse connection (DCEP), if requirement voltage design when working by straight polarity direct current (DCEN), when DC reverse connection (DCEP) works, supply voltage can be too little and do not meet the demands, if requirement voltage design when working by DC reverse connection (DCEP), when straight polarity direct current (DCEN) works, the trigger impulse of front level power supply can be very narrow, power source performance may be caused unstable.
To solve the problem, method the most traditional is the DC constant flowing power of employing two different performances, respectively as the power supply of straight polarity direct current (DCEN) and DC reverse connection (DCEP), electrical schematic diagram as shown in Figure 1, can solve the problem though this design allows, but prime needs the DC constant flowing power of two different performances, what secondary inverting adopted again is full bridge inverter, and cost is higher.
For above-mentioned technical problem, the present invention also been proposed the variable polarity plasma arc welding power source that one can adapt to straight polarity direct current (DCEN) and the different voltage requirements of DC reverse connection (DCEP) electric arc.
Summary of the invention
The present invention is directed to deficiency and the defect of prior art existence, propose variable polarity plasma arc welding power source main circuit topological structure and current control method that one can adapt to straight polarity direct current (DCEN) and the different voltage requirements of DC reverse connection (DCEP) electric arc, can require to carry out adaptivity adjustment according to power work positive-negative half-cycle welding procedure difference to straight polarity direct current during power solder (DCEN) and DC reverse connection (DCEP) operating voltage requirements under Variable Polarity pattern, thus reach better welding quality, that power supply has the voltage regulation factor more optimized, and when straight polarity direct current (DCEN) and DC reverse connection (DCEP) switch, the pulse width variations scope of trigger impulse is little, make the control system of power supply closer to small signal system, power source performance is more stable, the pulsewidth avoiding trigger impulse wide variation and the problem of the systematic function instability caused continually.The present invention is in order to adapt to straight polarity direct current (DCEN) and the different voltage requirements of DC reverse connection (DCEP) electric arc, it is the input of the secondary inverting changed by the switching of transformer, instead of significantly revise dutycycle, be easy to design on control circuit, and the problem avoiding the mistake zero velocity that causes because control circuit dynamic property is not enough excessively slow.The present invention can realize CONSTANT CURRENT WELDING, can when DC reverse connection (DCEP) works, control the high-frequency impulse forming certain frequency, to be used for improving arc stiffness, by the control of control unit, under the present invention can be operated in DC mode, Variable Polarity (interchange) pattern and Variable Polarity (interchange) pattern adding high frequency.
As long as the present invention is realized by following technical measures:
Adaptivity variable polarity plasma arc welding power source is a kind of novel variable-polarity plasma welding power supply, comprises control unit, the DC constant flowing power part of dual output, current transformer, coupling inductance, secondary inverting unit, secondary drive circuit.Three-phase alternating current inputs to the DC constant flowing power part of dual output, the current transformer of current signal is gathered through being used at the output of the DC constant flowing power part of dual output, the output of current transformer after sampling processing is connected to control unit, control unit outputs control signals to the DC constant flowing power part of dual output, the output of the DC constant flowing power part of dual output is connected to secondary inverting unit through coupling inductance, voltage in secondary inverting unit, the output of output after signal transacting of electric current and temperature collection circuit is connected to control unit, control unit exports control signal, the trigger end of the semiconductor switch in secondary inverting unit is delivered to through the modulation of secondary inverting control circuit.
The DC constant flowing power part of dual output comprises current rectifying and wave filtering circuit, bridge inverter main circuit, the multitap high frequency transformer of secondary, commutation diode D1, D2, D3 and D4; The three-phase alternating current of 380V inputs to the current rectifying and wave filtering circuit of the DC constant flowing power of dual output, the output of current rectifying and wave filtering circuit is connected to the input of bridge inverter main circuit, the high frequency square wave alternating current obtained through inversion is connected to the former limit of the multitap high frequency transformer of secondary, through the multitap high frequency transformer of secondary, obtain the different two-way of voltage swing at secondary to export, two-way exports respectively through commutation diode D1, D2, D3 and D4, obtains the different direct current of two-way performance and exports.The secondary of the multitap high frequency transformer of secondary of Dual module part has the node of 5 taps formation: its limit, Central Plains number of turn is Np, secondary is extracted tap out by node 1 and is formed node 2 after Ns1 circle, after Ns2 circle, extracted out tap by node 2 form node 3 along equidirectional, after Ns2 circle, extracted out tap by node 3 form node 4 along equidirectional, after Ns1 circle, extracted out tap by node 4 form node 5 along equidirectional.When power work is in Variable Polarity state, when straight polarity direct current (DCEN) works, the former secondary no-load voltage ratio of voltage is Np:Ns2, when DC reverse connection (DCEP) works, the former secondary no-load voltage ratio of voltage is Np:(Ns1+Ns2), thus straight polarity direct current (DCEN) and the different voltage requirements of DC reverse connection (DCEP) electric arc can be adapted to.The node 1 of the multitap high frequency transformer of above-mentioned secondary is connected with the negative electrode of diode D1, node 5 is connected with the negative electrode of diode D4, the anode of diode D1 and D4 is connected to form the negative pole of DC reverse connection (DCEP), node 2 is connected with the anode of diode D2, node 4 is connected with the anode of diode D3, the negative electrode of diode D2 and D2 is connected to form the positive pole of straight polarity direct current (DCEN), node 3 when straight polarity direct current (DCEN) works as the negative pole of straight polarity direct current (DCEN), when DC reverse connection (DCEP) works as the positive pole of DC reverse connection (DCEP), secondary inverting unit has three terminals upper arm terminals, underarm terminals and intermediate connection ends, has the control signal modulation circuit of peak value saturated circuit, over-current signal testing circuit and secondary inverting, coupling inductance is connected with in the middle of the DC constant flowing power part of dual output and secondary inverting unit, coupling inductance is made up of the coil that two numbers of turn are identical, there are 4 terminals: wherein terminal 1 and terminal 2 belong to same coil, terminal 3 and terminal 4 belong to same coil, terminal 1 and terminal 3 are Same Name of Ends, terminal 2 is Same Name of Ends with terminal 4. the negative pole of DC reverse connection (DCEP) of the DC constant flowing power part of dual output is connected with the terminal 2 of coupling inductance, the positive pole of straight polarity direct current (DCEN) is connected with the terminal 3 of coupling inductance, the terminal 1 of coupling inductance is connected with the underarm terminals of secondary inverting unit, the terminal 4 of coupling inductance is connected with the upper arm terminals of secondary inverting unit respectively, current transformer is put in the DC constant flowing power part of dual output and the junction of mutual coupling inductance, sample rate current value of feedback.Modulation circuit and Isolation input are to control unit after filtering for the current feedback signal of sampling, and control unit receives sampled signal, carry out the turning on and off of switching tube of full bridge inverter in DC constant flowing power that treatment and analysis controls dual output; The node 3 of the multitap high frequency transformer of secondary in the DC constant flowing power part of dual output is connected to the tungsten electrode output of plasma gun, and the intermediate connection that the E pole of the VT1 of secondary inverting unit and the C pole of VT2 are connected to form is connected to welding work pieces and exports.
Secondary inverting unit is by half-bridge inversion circuit, over-voltage and over-current temperature protection signal generating circuit, peak value protection circuit forms, alternating current 220V is through over commutation, positive pole is connected to the negative electrode of diode D5, the anode of diode D6, the positive pole of polar capacitor C1, 1 end of power resistor R2, negative pole is connected to the negative pole of polar capacitor C1, 2 ends of power resistor R2, the E pole of switching tube VT2, the negative electrode of diode D6 is connected to 1 end of power resistor R1, the anode of diode D5 is connected to the C pole of switching tube VT1, 2 ends of resistance R1 are connected to the tap 3 of the multitap high frequency transformer of secondary in the DC constant flowing power part of dual output, they constitute peak value protection circuit jointly.Half-bridge inversion circuit is wherein made up of two switching tube VT1 and VT2.Over-voltage and over-current temperature protection signal generating circuit is by gathering the electric current in secondary inverter circuit, voltage and temperature signal, the over-voltage and over-current temperature protection signal produced exports control unit to, control unit exports a road control signal, modulation through elementary modulation circuit produces the contrary drive singal of two-way phase place, two paths of signals is respectively through monostable circuit, what the present invention adopted is two monostable circuit CD4098 chips, electric capacity C2 is connected between 1 pin of CD4098 chip and 2 pin, one end of 2 pin connecting resistance R10 of CD4098 chip, another termination power supply 15V of R10, electric capacity C1 is connected between 14 pin of CD4098 chip and 15 pin, one end of 14 pin connecting resistance R8 of CD4098 chip, another termination power supply 15V of R10, by regulating or change the value of electric capacity C1 and resistance R8, make the size of C2 equal with C1 again, make the size of R10 equal with R8 again, the level of two paths of signals is made to have the high level of 2us-10us overlapping in the redirect conversion moment.The PWM that the satisfactory phase place of two-way produced is contrary exports the trigger end of the switching tube be connected in secondary inverter circuit, control opening and shutoff of secondary inverter circuit breaker in middle pipe, make straight polarity direct current (DCEN) and DC reverse connection (DCEP) alternation, power work is under Variable Polarity pattern.
The present invention mainly passes through the output of the bridge inverter main circuit in DC constant flowing power through the multitap high frequency transformer of secondary, obtain the different two-way of voltage swing at secondary to export, thus two groups of direct currents that when obtaining same output current size, voltage performance is different export, thus meet the different voltage requirements of welding procedure to straight polarity direct current (DCEN) and DC reverse connection (DCEP) electric arc, while reaching higher welding quality, solve because trigger impulse dutycycle produce when straight polarity direct current (DCEN) and DC reverse connection (DCEP) switch wide variation time control circuit dynamic property deficiency and the excessively slow problem of the mistake zero velocity brought and the large problem of mains voltage variations rate, voltage regulation factor is changed in the scope more optimized, and the excursion of the dutycycle of trigger impulse also reduces greatly, make power source performance more stable.The mode that the present invention is combined by algorithm design and design on control circuit, improve current over-zero speed during secondary inverting Variable Polarity, improve the stability of electric arc during Variable Polarity, adopt new algorithm, in the current half wave that straight polarity direct current (DCEN) works, add high-frequency impulse, improve arc stiffness.
Accompanying drawing explanation
Fig. 1 is for one according to an embodiment of the invention can adapt to a kind of electrical schematic diagram of straight polarity direct current (DCEN) and the variable polarity plasma arc welding power source device of employing two prime dc sources of the different voltage requirements of DC reverse connection (DCEP) electric arc.
Fig. 2 is employing prime dc source that can adapt to straight polarity direct current (DCEN) and the different voltage requirements of DC reverse connection (DCEP) electric arc of a kind of improvement and output adopts a kind of electrical schematic diagram of the variable polarity plasma arc welding power source device of the multitap high frequency transformer of secondary.
Fig. 3 is the modulation circuit of secondary inverting triggering signal.
Detailed description of the invention
The present invention should be specified be not limited in application in its structure detail that is that illustrate in following introduction or that show in accompanying drawing and arrangements of elements before in detail explaining at least one example of the present invention.The present invention can have other embodiments or realize in many ways or practice.The term that also should adopt clearly below and buzz word are only limitted to task of explanation and should be considered to a kind of restriction.
Figure 2 shows that a kind of electrical schematic diagram according to a kind of according to an embodiment of the invention adaptivity variable polarity plasma arc welding power source device.Comprise control unit 3, current rectifying and wave filtering circuit 1, bridge inverter main circuit 2, secondary multitap high frequency transformer T1(main transformer) and commutation diode D1, D2, D3, D4 form the DC constant flowing power that two-way exports, coupling inductance L, secondary inverting unit 4, the current detecting of current transformer composition and feedback circuit 5, secondary drive circuit 6.
The control core chip that control unit of the present invention adopts is a interconnection type microcontroller STM32F107 that STMicw Electronics releases, and control core chip also can adopt other can complete the chip of corresponding function.
Current rectifying and wave filtering circuit 1, full bridge inverter 2, secondary multitap high frequency transformer T1(main transformer), with commutation diode D1, D2, D3, D4 forms a DC constant flowing power, the secondary multitap high frequency transformer T1(main transformer of Dual module part) secondary there is the node that 5 taps are formed: its limit, Central Plains number of turn is Np, secondary is extracted tap out by node 1 and is formed node 2 after Ns1 circle, after Ns2 circle, extracted out tap by node 2 form node 3 along equidirectional, after Ns2 circle, extracted out tap by node 3 form node 4 along equidirectional, after Ns1 circle, extracted out tap by node 4 form node 5 along equidirectional.After Ns1 circle, extract tap out by node 1 and form node 2, after Ns2 circle, extracted out tap by node 2 form node 3 along equidirectional, after Ns2 circle, extracted out tap by node 3 form node 4 along equidirectional, after Ns1 circle, extracted out tap by node 4 form node 5 along equidirectional.Secondary node 2 is connected with the anode of diode D2, node 4 is connected with the anode of diode D3, the negative electrode of diode D2 and D3 is connected to form the positive pole of straight polarity direct current (DCEN), through current transformer 5, to carry out current detecting and feedback, then be connected to the terminal 3 of coupling inductance L, export from 4 ends of coupling inductance L the C pole being connected to switching device VT1; Node 1 is connected with the negative electrode of diode D1, and node 5 is connected with the negative electrode of diode D4, and the anode of diode D1 and D4 is connected to form the negative pole of DC reverse connection (DCEP), is connected to the terminal 2 of coupling inductance L; The E pole of switching device VT2 is passed through through current transformer 5, to carry out current detecting and feedback, then the terminal 1 of coupling inductance L is connected to, multi-coil high frequency transformer T1(main transformer) secondary node 3 be connected to the tungsten electrode of plasma gun, the E pole of VT1 is connected with the C pole of VT2, and common output is connected to workpiece.
Secondary inverting unit 4 is made up of half-bridge inversion circuit and peak value protection circuit, alternating current 220V is through rectifier bridge, positive pole exports the negative electrode being connected to diode D5, the anode of diode D6, the positive pole of polar capacitor C1, 1 end of power resistor R2, negative pole exports the negative pole being connected to polar capacitor C1, 2 ends of power resistor R2, the E pole of switching tube VT2, the negative electrode of diode D6 is connected to 1 end of power resistor R1, the anode of diode D5 is connected to the C pole of switching tube VT1, 2 ends of resistance R1 are connected to multi-coil high frequency transformer T1(main transformer) secondary node 3, they constitute peak value protection circuit jointly.Half-bridge inversion circuit is wherein made up of two switching tube VT1 and VT2.
Control unit exports a road control signal, be delivered to secondary drive circuit 6, modulation through elementary modulation circuit produces the contrary drive singal of two-way phase place, two paths of signals is respectively through monostable circuit, what the present invention adopted is two monostable circuit CD4098 chips, electric capacity C2 is connected between 1 pin of CD4098 chip and 2 pin, one end of 2 pin connecting resistance R10 of CD4098 chip, another termination power supply 15V of R10, electric capacity C1 is connected between 14 pin of CD4098 chip and 15 pin, one end of 14 pin connecting resistance R8 of CD4098 chip, another termination power supply 15V of R10, by regulating or change the value of electric capacity C1 and resistance R8, make the size of C2 equal with C1 again, make the size of R10 equal with R8 again, the level of two paths of signals is made to have the high level of 2us-10us overlapping in the redirect conversion moment.The PWM that the satisfactory phase place of two-way produced is contrary exports the trigger end of the switching tube be connected in secondary inverter circuit, control opening and shutoff of secondary inverter circuit breaker in middle pipe, make straight polarity direct current (DCEN) and DC reverse connection (DCEP) alternation, power work is under Variable Polarity pattern.
In foregoing circuit, when straight polarity direct current (DCEN) works, multi-coil high frequency transformer T1(main transformer) in no-load voltage ratio be Np:Ns1, when DC reverse connection (DCEP) works, multi-coil high frequency transformer T1(main transformer) in no-load voltage ratio be N1:Ns2, adopt different no-load voltage ratios, the voltage requirements that during to adapt to variable polarity welding, welding procedure is different with DC reverse connection (DCEP) electric arc to straight polarity direct current (DCEN), coupling inductance L is divided into L1 and L2 two turn ratioes to be the coil of 1:1, wherein the terminal 1 of L1 and the terminal 3 of L2 are Same Name of Ends, in like manner, the terminal 2 of L1 and the terminal 4 of L2 are also Same Name of Ends.The sample rate current that control unit 3 receives current transformer 5 through light-coupled isolation to drive the switching tube of full bridge inverter 2.
The present invention produces certain control signal by control unit 3, satisfactory switching signal is produced through secondary drive circuit 6, and control opening and shutoff of two switching tubes through light-coupled isolation, power work can be made at direct current bond pattern and Variable Polarity (interchange) bond pattern.When the present invention is operated in Variable Polarity (interchange) bond pattern, control unit 3 is when DC reverse connection (DCEP) works, periodic regularity ground changes the set-point of output current, thus obtain the high-frequency impulse with certain frequency when DC reverse connection (DCEP) exports at output, to be used for improving arc stiffness, obtain high frequency mode.The feedback of voltage and current that secondary inverter circuit 4 produces, with guard signal, is connected to control unit 3, if power work is in abnormal condition, then blocks each road triggering signal, with protection power source.
The control unit of system can also according to actual welding demand, regulation output welding current, current peak-peak value when regulating DC reverse connection (DCEP) under high frequency mode to work, regulates the welding parameter such as working time, ion-gas flow of alternate current operation cycle and straight polarity direct current (DCEN), DC reverse connection (DCEP).
Claims (6)
1. adaptivity variable polarity plasma arc welding power source, is characterized in that: comprise control unit, the DC constant flowing power part of dual output, current transformer, coupling inductance L, secondary inverting unit, secondary drive circuit, three-phase alternating current inputs to the DC constant flowing power part of dual output, the current transformer of current signal need be gathered through being used at the output of the DC constant flowing power part of dual output, the output of current transformer after sampling processing is connected to control unit, control unit outputs control signals to the DC constant flowing power part of dual output, the output of the DC constant flowing power part of dual output is connected to secondary inverting unit through coupling inductance, voltage in secondary inverting unit, the output of output after signal transacting of electric current and temperature collection circuit is connected to control unit, control unit exports control signal, the trigger end of the semiconductor switch in secondary inverting unit is delivered to through the modulation of secondary drive circuit.
2. adaptivity variable polarity plasma arc welding power source according to claim 1, is characterized in that: the DC constant flowing power part of described dual output comprises current rectifying and wave filtering circuit, bridge inverter main circuit, the multitap high frequency transformer of secondary, commutation diode D1, D2, D3 and D4, the three-phase alternating current of 380V inputs to the current rectifying and wave filtering circuit of the DC constant flowing power of dual output, the output of current rectifying and wave filtering circuit is connected to the input of bridge inverter main circuit, the high frequency square wave alternating current obtained through inversion is connected to the former limit of the multitap high frequency transformer of secondary, through the multitap high frequency transformer of secondary, obtain the different two-way of voltage swing at secondary to export, two-way exports respectively through commutation diode D1, D2, D3 and D4, obtains the different direct current of two-way performance and exports, the output of the DC constant flowing power part of dual output adopts the multitap high frequency transformer of secondary, the secondary of the multitap high frequency transformer of secondary has the node of 5 taps formation: its limit, Central Plains number of turn is Np, secondary is extracted tap out by node 1 and is formed node 2 after Ns1 circle, after Ns2 circle, extracted out tap by node 2 form node 3 along equidirectional, after Ns2 circle, extracted out tap by node 3 form node 4 along equidirectional, after Ns1 circle, extracted out tap by node 4 form node 5 along equidirectional, when power work is in Variable Polarity state, when straight polarity direct current (DCEN) works, the former secondary no-load voltage ratio of voltage is Np:Ns2, and when DC reverse connection (DCEP) works, the former secondary no-load voltage ratio of voltage is Np:(Ns1+Ns2), the node 1 of the multitap high frequency transformer of above-mentioned secondary is connected with the negative electrode of diode D1, node 5 is connected with the negative electrode of diode D4, the anode of diode D1 and D4 is connected to form the negative pole of DC reverse connection (DCEP), node 2 is connected with the anode of diode D2, node 4 is connected with the anode of diode D3, the negative electrode of diode D2 and D2 is connected to form the positive pole of straight polarity direct current (DCEN), node 3 when straight polarity direct current (DCEN) works as the negative pole of straight polarity direct current (DCEN), when DC reverse connection (DCEP) works as the positive pole of DC reverse connection (DCEP), the positive pole of straight polarity direct current (DCEN) is connected with the upper arm terminals of secondary inverting unit through a coil of coupling inductance L, the negative pole of DC reverse connection (DCEP) is connected with the underarm terminals of secondary inverting unit through another coil of coupling inductance L, the node 3 of high frequency transformer is connected to the tungsten electrode output of plasma gun, and the intermediate connection that the E pole of the VT1 of secondary inverting unit and the C pole of VT2 are connected to form is connected to welding work pieces and exports.
3. adaptivity variable polarity plasma arc welding power source according to claim 1, it is characterized in that: in the middle of the DC constant flowing power part of described dual output and secondary inverting unit, be connected with coupling inductance L, this coupling inductance L is the two born of the same parents' inductance of coupling, coupling inductance is made up of the coil that two numbers of turn are identical, there are 4 terminals: wherein terminal 1 and terminal 2 belong to same coil, terminal 3 and terminal 4 belong to same coil, and terminal 1 and terminal 3 are Same Name of Ends, and terminal 2 and terminal 4 are Same Name of Ends; The negative pole of DC reverse connection (DCEP) of the DC constant flowing power part of dual output is connected with the terminal 2 of coupling inductance, the positive pole of straight polarity direct current (DCEN) is connected with the terminal 3 of coupling inductance, the terminal 1 of coupling inductance is connected with the underarm terminals of secondary inverting unit, and the terminal 4 of coupling inductance is connected with the upper arm terminals of secondary inverting unit respectively.
4. the DC constant flowing power part of the dual output of adaptivity variable polarity plasma arc welding power source according to claim 3 and secondary inverting unit, it is characterized in that: in the middle of the DC constant flowing power part of described dual output and secondary inverting unit, be only connected with a current transformer module, the positive pole of straight polarity direct current (DCEN) is connected with the terminal 3 of coupling inductance through current transformer module, the E pole of the lower brachium pontis switching tube VT2 of secondary inverting unit is connected with the terminal 1 of coupling inductance through same current transformer module through wire and the positive pole of straight polarity direct current (DCEN) are equidirectional.
5. adaptivity variable polarity plasma arc welding power source according to claim 1, it is characterized in that: described secondary inverting unit has peak value protection circuit, alternating current 220V is through over commutation, positive pole is connected to the negative electrode of diode D5, the anode of diode D6, the positive pole of polar capacitor C1, one end of power resistor R2, negative pole is connected to the negative pole of polar capacitor C1, the other end of power resistor R2, the E pole of switching tube VT2, the negative electrode of diode D6 is connected to one end of power resistor R1, the anode of diode D5 is connected to the C pole of switching tube VT1, the other end of resistance R1 is connected to the tap 3 of the multitap high frequency transformer of secondary in the DC constant flowing power part of dual output, they constitute peak value protection circuit jointly.
6. adaptivity variable polarity plasma arc welding power source according to claim 1, it is characterized in that: in secondary drive circuit, the road control signal that control unit exports, modulation through elementary modulation circuit produces the contrary drive singal of two-way phase place, two paths of signals is respectively through monostable circuit, what the present invention adopted is two monostable circuit CD4098 chips, electric capacity C2 is connected between 1 pin of CD4098 chip and 2 pin, one end of 2 pin connecting resistance R10 of CD4098 chip, another termination power supply 15V of R10, electric capacity C1 is connected between 14 pin of CD4098 chip and 15 pin, one end of 14 pin connecting resistance R8 of CD4098 chip, another termination power supply 15V of R10, by regulating or change the value of electric capacity C1 and resistance R8, make the size of C2 equal with C1 again, make the size of R10 equal with R8 again, the level of two paths of signals is made to have the high level of 2us-10us overlapping in the redirect conversion moment.
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| CN104607779A (en) * | 2014-11-18 | 2015-05-13 | 内蒙古工业大学 | 7-series high-strength aluminum alloy variable polarity plasma arc welding method |
| CN107745174B (en) * | 2017-11-30 | 2023-08-18 | 华南理工大学 | Digital variable-polarity welding power supply based on SiC IGBT |
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| CN103182596A (en) | 2013-07-03 |
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Application publication date: 20130703 Assignee: Beijing Beigong University Science Park Co.,Ltd. Assignor: Beijing University of Technology Contract record no.: X2024980001854 Denomination of invention: Adaptive variable polarity plasma arc welding power source Granted publication date: 20150603 License type: Common License Record date: 20240201 |
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