CN203292680U - Self-adaptive polarity-variable plasma arc welding power source - Google Patents
Self-adaptive polarity-variable plasma arc welding power source Download PDFInfo
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- CN203292680U CN203292680U CN2013201263664U CN201320126366U CN203292680U CN 203292680 U CN203292680 U CN 203292680U CN 2013201263664 U CN2013201263664 U CN 2013201263664U CN 201320126366 U CN201320126366 U CN 201320126366U CN 203292680 U CN203292680 U CN 203292680U
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Abstract
The utility model relates to a polarity-variable plasma arc welding power source adaptive to different voltage requirements of direct current straight polarity arc and direct current reverse polarity arc, and belongs to the field of material machining. Three-phase alternating current is input to a double-output direct current constant current power source part, the output end of the double-output direct current constant current power source par penetrates a current transformer used for collecting current signals, the output end, processed in a sampling mode, of the current transformer is connected to a control unit, the control unit outputs control signals to the double-output direct current constant current power source part, the output end of the double-output direct current constant current power source part is connected to a secondary converting unit through a coupling inducer, the output of a voltage, current and temperature collection circuit in the secondary converting unit is connected to the control unit through the output end processed in a signal mode, the control unit outputs control signals, and the control signals are modulated through a secondary driving circuit and then are transmitted to the secondary converting unit. The self-adaptive polarity-variable plasma arc welding power source can work under various work modes and meets the different voltage requirements of the direct current straight polarity arc and direct current reverse polarity arc, and meets the requirements of different welding processes.
Description
Technical field
The utility model is a kind of variable polarity plasma arc welding power source that can adapt to straight polarity direct current (DCEN) and 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) is the asymmetrical square wave AC plasma arc welding, is a kind of new and effective welding technique for aluminium and alloy exploitation thereof.It combine Variable Polarity TIG weldering and plasma weldering the advantage feature parameter can according to technological requirement flexibly, independent adjusting effectively utilizes the characteristic of the high-energy-density that plasma beam has, high effluxvelocity, hard arc power, realizes that the Aluminum Alloy Plate single face once welds two-sided free forming; Because welding deformation is little, productivity ratio is high, compare with other high energy beam current welding procedure (electron beam welding and Laser Welding), equipment is simple, the defects such as the low and pore of cost, slag inclusion are few, be called as abroad " zero-fault " welding method, the welding that has been successfully applied to the products such as space shuttle external tank is produced, and is counted as simultaneously the welding method in 21 century extensive application prospect.
At present, the variable-polarity plasma welding technology reaches its maturity, but still exists a lot of deficiencies.as: when the variable-polarity plasma welding power supply welds in Variable Polarity (interchange), when working to straight polarity direct current (DCEN), welding procedure require voltage lower, when working to dc reverse connection (DCEP), welding procedure require voltage higher, if adopt the method for traditional single power supply, when the 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 the prime power supply that larger voltage regulation factor is arranged, yet, general in Power Management Design, operating voltage to straight polarity direct current (DCEN) and dc reverse connection (DCEP) requires often can not take into account, if the design of the requirement voltage while by straight polarity direct current (DCEN), working, supply voltage can be too little and meet the demands when dc reverse connection (DCEP) is worked, if the design of the requirement voltage while by dc reverse connection (DCEP), working, before when straight polarity direct current (DCEN) is worked, the trigger impulse of level power supply can be very narrow, may cause power source performance unstable.
If address the above problem, the most traditional method is to adopt the dc constant flowing power of 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, though allowing, this design can address the above problem, but prime needs the dc constant flowing power of two different performances, and what secondary inverting adopted again is full bridge inverter, and cost is higher.
For above-mentioned technical problem, the utility model has proposed again a kind of variable polarity plasma arc welding power source that can adapt to straight polarity direct current (DCEN) and the different voltage requirements of dc reverse connection (DCEP) electric arc.
The utility model content
deficiency and defect that the utility model exists for prior art, a kind of variable polarity plasma arc welding power source main circuit topological structure and current control method that can adapt to straight polarity direct current (DCEN) and the different voltage requirements of dc reverse connection (DCEP) electric arc proposed, in the time of can the positive-negative half-cycle welding procedure is welded power supply under the Variable Polarity pattern according to power work, the difference of straight polarity direct current (DCEN) and dc reverse connection (DCEP) operating voltage demand requires to carry out the adaptivity adjustment, thereby reach better welding quality, that power supply has the voltage regulation factor of more optimizing, and when straight polarity direct current (DCEN) and dc reverse connection (DCEP) switching, 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 of having avoided trigger impulse is wide variation and the unsettled problem of systematic function that causes continually.The utility model 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 that changes of the switching by transformer, rather than significantly revise dutycycle, be easy to the control circuit design, and avoid the excessively slow problem of mistake zero velocity that causes because the control circuit dynamic property is not enough.The utility model can be realized CONSTANT CURRENT WELDING, can be when dc reverse connection (DCEP) be worked, control the high-frequency impulse that forms certain frequency, to be used for improving arc stiffness, by the control of control module, the utility model can be operated under DC mode, Variable Polarity (interchange) pattern and the Variable Polarity that adds high frequency (interchange) pattern.
The utility model is so long as realize by following technical measures:
the adaptivity variable polarity plasma arc welding power source, comprise dc constant flowing power part, current transformer, coupling inductance L, secondary inverting unit, the secondary drive circuit of control module, dual output, three-phase alternating current inputs to the dc constant flowing power part of dual output, need pass to gather the current transformer of current signal at the dc constant flowing power output partly of dual output, the output of current transformer after sampling processing is connected to control module, control module 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 the secondary inverting unit through coupling inductance, voltage in the secondary inverting unit, the output of the output of electric current and temperature collection circuit after signal is processed is connected to control module, control module output control signal, be delivered to the trigger end of the semiconductor switch in the secondary inverting unit through the modulation of secondary drive circuit.
the dc constant flowing power of described dual output partly comprises current rectifying and wave filtering circuit, bridge inverter main circuit, the multitap high frequency transformer of secondary, commutation diode D1, commutation diode D2, commutation diode D3 and commutation diode 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 that the process inversion obtains 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 outputs of voltage swing at secondary, commutation diode D1, commutation diode D2, commutation diode D3 and commutation diode D4 are passed through respectively in two-way output, obtain the different direct current output of two-way performance, the multitap high frequency transformer of secondary is adopted in the output of the dc constant flowing power part of dual output, the secondary of the multitap high frequency transformer of secondary has the node that 5 taps form: its limit, Central Plains number of turn is Np, secondary is extracted out tap and is formed node 2 after the Ns1 circle by node 1, extract tap out form node 3 after the Ns2 circle along equidirectional by node 2, extract tap out forms node 4 after the Ns2 circle along equidirectional by node 3, by node 4 along equidirectional after the Ns1 circle extraction tap form node 5, during at the Variable Polarity state, during straight polarity direct current (DCEN) work, the former secondary no-load voltage ratio of voltage is Np:Ns2 when power work, and during dc reverse connection (DCEP) work, 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 commutation diode D1, node 5 is connected with the negative electrode of commutation diode D4, the anode of commutation diode D1 and commutation diode D4 is connected to form the negative pole of dc reverse connection (DCEP), node 2 is connected with the anode of commutation diode D2, node 4 is connected with the anode of commutation diode D3, the negative electrode of commutation 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) is worked as the negative pole of straight polarity direct current (DCEN), when dc reverse connection (DCEP) is worked 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 the 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 utmost point of the switching tube VT1 of secondary inverting unit and the C utmost point of switching tube VT2 are connected to form is connected to welding work pieces output.
be connected with coupling inductance L in the middle of the dc constant flowing power part of described dual output and secondary inverting unit, this coupling inductance L is the two born of the same parents' inductance of coupling, that is: coupling inductance is comprised of two identical coils of the number of turn, have 4 terminals: wherein terminal 1 and terminal 2 belong to same coil, terminal 3 and terminal 4 belong to same coil, terminal 1 is Same Name of Ends with terminal 3, terminal 2 is Same Name of Ends with terminal 4. the negative pole of the 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 the underarm terminals and is connected with the secondary inverting unit, the terminal 4 of coupling inductance is connected with the upper arm terminals of secondary inverting unit respectively.
Only be connected with a current transformer module in the middle of the dc constant flowing power part of described dual output and secondary inverting unit, the positive pole of straight polarity direct current (DCEN) passes current transformer module and is connected with the terminal 3 of coupling inductance, and the E utmost point of the lower brachium pontis switching tube VT2 of secondary inverting unit passes same current transformer module through wire and straight polarity direct current (DCEN) anodal equidirectional and is connected with the terminal 1 of coupling inductance.
described secondary inverting unit has the peak value holding circuit, alternating current 220V is through over commutation, positive pole is connected to the negative electrode of commutation diode D5, the anode of commutation diode D6, the positive pole of polar capacitor C1, the 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 utmost point of switching tube VT2, the negative electrode of commutation diode D6 is connected to the end of power resistor R1, the anodic bonding of commutation diode D5 is to the C utmost point of switching tube VT1, the other end of resistance R 1 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 have formed the peak value holding circuit jointly.
one tunnel control signal of control module output, produce the driving signal of two-way single spin-echo through the modulation of elementary modulation circuit, two paths of signals passes through respectively the monostable chip, what described monostable chip adopted is two monostable circuit CD4098 chips, be connected to capacitor C 2 between 1 pin of CD4098 chip and 2 pin, the end of 2 pin connecting resistance R10 of CD4098 chip, another termination power supply 15V of R10, be connected to capacitor C 1 between 14 pin of CD4098 chip and 15 pin, the end of 14 pin connecting resistance R8 of CD4098 chip, another termination power supply 15V of R10, by regulating or change the value of capacitor C 1 and resistance R 8, make again the size of C2 equate with C1, make again the size of R10 equate with R8, make the level of two paths of signals constantly have the high level of 2us-10us overlapping in the redirect conversion.
the utility model is mainly the multitap high frequency transformer of output process secondary by the bridge inverter main circuit with in dc constant flowing power, obtain the different two-way outputs of voltage swing at secondary, thereby two groups of different direct current outputs of voltage performance while obtaining same output current size, thereby the different voltage requirements of welding procedure to straight polarity direct current (DCEN) and dc reverse connection (DCEP) electric arc have been met, when reaching higher welding quality, solved because trigger impulse dutycycle control circuit dynamic property deficiency and excessively slow problem and large problem of mains voltage variations rate of mistake zero velocity of bringing when straight polarity direct current (DCEN) and dc reverse connection (DCEP) switching and during the wide variation that produces, voltage regulation factor is changed in the scope of more optimizing, and the excursion of the dutycycle of trigger impulse also reduces greatly, make power source performance more stable.The utility model is by the mode of algorithm design and control circuit design combination, current over-zero speed while improving the secondary inverting Variable Polarity, the stability of electric arc while having improved Variable Polarity, adopt new algorithm, add high-frequency impulse in the electric current half-wave of straight polarity direct current (DCEN) work, improve arc stiffness.
Description of drawings
Fig. 1 is a kind of a kind of electrical schematic diagram that can adapt to straight polarity direct current (DCEN) and the variable polarity plasma arc welding power source device of two prime dc sources of employing of the different voltage requirements of dc reverse connection (DCEP) electric arc according to the utility model one embodiment.
Fig. 2 is a kind of electrical schematic diagram that a kind of improved prime dc source of employing that can adapt to straight polarity direct current (DCEN) and the different voltage requirements of dc reverse connection (DCEP) electric arc and output adopt 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.
The specific embodiment
Should clear and definite the utility model before in detail explaining at least one example of the present utility model be not limited in illustrate in following introduction or accompanying drawing in its structure detail of showing and the application on arrangements of elements.The utility model can have other embodiment or realize in many ways or practice.Term and the buzz word that also should clearly adopt below only limit to task of explanation and should not be considered to a kind of restriction.
Figure 2 shows that a kind of electrical schematic diagram according to a kind of adaptivity variable polarity plasma arc welding power source device according to the utility model one embodiment.Comprise control module 3, current rectifying and wave filtering circuit 1, bridge inverter main circuit 2, the multitap high frequency transformer T1(of secondary main transformer) and commutation diode D1, D2, D3, D4 form the dc constant flowing power of a two-way output, coupling inductance L, secondary inverting unit 4, current detecting and feedback circuit 5 that current transformer forms, secondary drive circuit 6.
The control core chip that control module of the present utility model adopts is a interconnection type microcontroller STM32F107 that STMicw Electronics releases, and the 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, the multitap high frequency transformer T1(of secondary main transformer), with commutation diode D1, D2, D3, D4 forms a dc constant flowing power, the multitap high frequency transformer T1(of the secondary main transformer of Dual module part) secondary has the node that 5 taps form: its limit, Central Plains number of turn is Np, secondary is extracted out tap and is formed node 2 after the Ns1 circle by node 1, extract tap out form node 3 after the Ns2 circle along equidirectional by node 2, extract tap out form node 4 after the Ns2 circle along equidirectional by node 3, extract tap out form node 5 after the Ns1 circle along equidirectional by node 4.Extracted out tap by node 1 and form node 2 after the Ns1 circle, extract tap out form node 3 after the Ns2 circle along equidirectional by node 2, extract tap out forms node 4 after the Ns2 circle along equidirectional by node 3, by node 4 along equidirectional after the Ns1 circle extraction tap form node 5.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), pass current transformer 5, to carry out current detecting and feedback, then be connected to the terminal 3 of coupling inductance L, be connected to the C utmost point of switching device VT1 from the 4 end outputs of coupling inductance L; 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 utmost point of switching device VT2 is through passing current transformer 5, to carry out current detecting and feedback, then be connected to the terminal 1 of coupling inductance L, multi-coil high frequency transformer T1(main transformer) secondary node 3 is connected to the tungsten electrode of plasma gun, the E utmost point of VT1 is connected with the C utmost point of VT2, and common output is connected to workpiece.
control module output one tunnel control signal, be delivered to secondary drive circuit 6, produce the driving signal of two-way single spin-echo through the modulation of elementary modulation circuit, two paths of signals passes through respectively monostable circuit, what the utility model adopted is two monostable circuit CD4098 chips, be connected to capacitor C 2 between 1 pin of CD4098 chip and 2 pin, the end of 2 pin connecting resistance R10 of CD4098 chip, another termination power supply 15V of R10, be connected to capacitor C 1 between 14 pin of CD4098 chip and 15 pin, the end of 14 pin connecting resistance R8 of CD4098 chip, another termination power supply 15V of R10, by regulating or change the value of capacitor C 1 and resistance R 8, make again the size of C2 equate with C1, make again the size of R10 equate with R8, make the level of two paths of signals constantly have the high level of 2us-10us overlapping in the redirect conversion.The PWM output of the satisfactory single spin-echo of two-way that produces is connected to the trigger end of the switching tube in secondary inverter circuit, control opening and turn-offing of switching tube in secondary inverter circuit, make straight polarity direct current (DCEN) and dc reverse connection (DCEP) alternation, power work is under the Variable Polarity pattern.
in foregoing circuit, when straight polarity direct current (DCEN) is worked, multi-coil high frequency transformer T1(main transformer) in, no-load voltage ratio is Np:Ns1, when dc reverse connection (DCEP) is worked, multi-coil high frequency transformer T1(main transformer) in, no-load voltage ratio is N1:Ns2, adopt different no-load voltage ratios, while to adapt to Variable Polarity, welding, welding procedure is to straight polarity direct current (DCEN) and the different voltage requirements of dc reverse connection (DCEP) electric arc, coupling inductance L is divided into the coil that L1 and two turn ratioes of L2 are 1:1, wherein the terminal 3 of the terminal 1 of L1 and L2 is 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 module 3 receives current transformer 5 drives the switching tube of full bridge inverter 2 through light-coupled isolation.
The utility model produces certain control signal by control module 3, produce satisfactory switching signal through secondary drive circuit 6, and through light-coupled isolation, control opening and turn-offing of two switching tubes, can make power work at direct current bond pattern and Variable Polarity (interchange) bond pattern.When the utility model is operated in Variable Polarity (interchange) bond pattern, when control module 3 is worked at dc reverse connection (DCEP), periodic regularity ground changes the set-point of output current, thereby the high-frequency impulse with certain frequency when output obtains dc reverse connection (DCEP) 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 module 3, if power work, in abnormal condition, blocks each road triggering signal, with protection power source.
The control module of system can also be according to the actual welding demand, the welding parameters such as current peak-peak value, adjusting alternate current operation cycle and the straight polarity direct current (DCEN) when under regulation output welding current, adjusting high frequency mode, dc reverse connection (DCEP) is worked, the working time of dc reverse connection (DCEP), ion-gas flow.
Claims (6)
1. the adaptivity variable polarity plasma arc welding power source, is characterized in that: the dc constant flowing power part, current transformer, coupling inductance L, secondary inverting unit, the secondary drive circuit that comprise control module, dual output, three-phase alternating current inputs to the dc constant flowing power part of dual output, need pass to gather the current transformer of current signal at the dc constant flowing power output partly of dual output, the output of current transformer after sampling processing is connected to control module, control module 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 the secondary inverting unit through coupling inductance, voltage in the secondary inverting unit, the output of the output of electric current and temperature collection circuit after signal is processed is connected to control module, control module output control signal, be delivered to the trigger end of the semiconductor switch in the secondary inverting unit through the modulation of secondary drive circuit.
2. adaptivity variable polarity plasma arc welding power source according to claim 1, it is characterized in that: the dc constant flowing power of described dual output partly comprises current rectifying and wave filtering circuit, bridge inverter main circuit, the multitap high frequency transformer of secondary, commutation diode D1, commutation diode D2, commutation diode D3 and commutation diode 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 that the process inversion obtains 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 outputs of voltage swing at secondary, commutation diode D1, commutation diode D2, commutation diode D3 and commutation diode D4 are passed through respectively in two-way output, obtain the different direct current output of two-way performance, the multitap high frequency transformer of secondary is adopted in the output of the dc constant flowing power part of dual output, the secondary of the multitap high frequency transformer of secondary has the node that 5 taps form: its limit, Central Plains number of turn is Np, secondary is extracted out tap and is formed node 2 after the Ns1 circle by node 1, extract tap out form node 3 after the Ns2 circle along equidirectional by node 2, extract tap out forms node 4 after the Ns2 circle along equidirectional by node 3, by node 4 along equidirectional after the Ns1 circle extraction tap form node 5, during at the Variable Polarity state, during straight polarity direct current (DCEN) work, the former secondary no-load voltage ratio of voltage is Np:Ns2 when power work, and during dc reverse connection (DCEP) work, 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 commutation diode D1, node 5 is connected with the negative electrode of commutation diode D4, the anode of commutation diode D1 and commutation diode D4 is connected to form the negative pole of dc reverse connection (DCEP), node 2 is connected with the anode of commutation diode D2, node 4 is connected with the anode of commutation diode D3, the negative electrode of commutation 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) is worked as the negative pole of straight polarity direct current (DCEN), when dc reverse connection (DCEP) is worked 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 the 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 utmost point of the switching tube VT1 of secondary inverting unit and the C utmost point of switching tube VT2 are connected to form is connected to welding work pieces output.
3. adaptivity variable polarity plasma arc welding power source according to claim 1, it is characterized in that: be connected with coupling inductance L in the middle of the dc constant flowing power part of described dual output and secondary inverting unit, this coupling inductance L is the two born of the same parents' inductance of coupling, that is: coupling inductance is comprised of two identical coils of the number of turn, have 4 terminals: wherein terminal 1 and terminal 2 belong to same coil, terminal 3 and terminal 4 belong to same coil, terminal 1 is Same Name of Ends with terminal 3, terminal 2 is Same Name of Ends with terminal 4. the negative pole of the 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 the underarm terminals and is connected with the secondary inverting unit, the terminal 4 of coupling inductance is connected with the upper arm terminals of secondary inverting unit respectively.
4. adaptivity variable polarity plasma arc welding power source according to claim 3, it is characterized in that: only be connected with a current transformer module in the middle of the dc constant flowing power part of described dual output and secondary inverting unit, the positive pole of straight polarity direct current (DCEN) passes current transformer module and is connected with the terminal 3 of coupling inductance, and the E utmost point of the lower brachium pontis switching tube VT2 of secondary inverting unit passes same current transformer module through wire and straight polarity direct current (DCEN) anodal equidirectional and is connected with the terminal 1 of coupling inductance.
5. adaptivity variable polarity plasma arc welding power source according to claim 1, it is characterized in that: described secondary inverting unit has the peak value holding circuit, alternating current 220V is through over commutation, positive pole is connected to the negative electrode of commutation diode D5, the anode of commutation diode D6, the positive pole of polar capacitor C1, the 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 utmost point of switching tube VT2, the negative electrode of commutation diode D6 is connected to the end of power resistor R1, the anodic bonding of commutation diode D5 is to the C utmost point of switching tube VT1, the other end of resistance R 1 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 have formed the peak value holding circuit jointly.
6. adaptivity variable polarity plasma arc welding power source according to claim 1, it is characterized in that: a road control signal of control module output, produce the driving signal of two-way single spin-echo through the modulation of elementary modulation circuit, two paths of signals passes through respectively the monostable chip, what described monostable chip adopted is two monostable circuit CD4098 chips, be connected to capacitor C 2 between 1 pin of CD4098 chip and 2 pin, the end of 2 pin connecting resistance R10 of CD4098 chip, another termination power supply 15V of R10, be connected to capacitor C 1 between 14 pin of CD4098 chip and 15 pin, the end of 14 pin connecting resistance R8 of CD4098 chip, another termination power supply 15V of R10, by regulating or change the value of capacitor C 1 and resistance R 8, make again the size of C2 equate with C1, make again the size of R10 equate with R8, make the level of two paths of signals constantly have the high level of 2us-10us overlapping in the redirect conversion.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013201263664U CN203292680U (en) | 2013-03-19 | 2013-03-19 | Self-adaptive polarity-variable plasma arc welding power source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201263664U CN203292680U (en) | 2013-03-19 | 2013-03-19 | Self-adaptive polarity-variable plasma arc welding power source |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103182596A (en) * | 2013-03-19 | 2013-07-03 | 北京工业大学 | Adaptive variable polarity plasma arc welding power supply |
| CN110961771A (en) * | 2019-12-30 | 2020-04-07 | 忠旺(辽阳)铝模板制造有限公司 | Plasma welding method of aluminum alloy plate |
| CN117805690B (en) * | 2024-02-28 | 2024-05-03 | 西安为光能源科技有限公司 | Method for detecting polarity reversal of double-active-bridge topological isolation transformer |
-
2013
- 2013-03-19 CN CN2013201263664U patent/CN203292680U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103182596A (en) * | 2013-03-19 | 2013-07-03 | 北京工业大学 | Adaptive variable polarity plasma arc welding power supply |
| CN103182596B (en) * | 2013-03-19 | 2015-06-03 | 北京工业大学 | Adaptive variable polarity plasma arc welding power supply |
| CN110961771A (en) * | 2019-12-30 | 2020-04-07 | 忠旺(辽阳)铝模板制造有限公司 | Plasma welding method of aluminum alloy plate |
| CN117805690B (en) * | 2024-02-28 | 2024-05-03 | 西安为光能源科技有限公司 | Method for detecting polarity reversal of double-active-bridge topological isolation transformer |
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