CN110064817A - Fast frequency pulse TIG welding connects power supply low-and high-frequency energy conversion and compound circuit - Google Patents
Fast frequency pulse TIG welding connects power supply low-and high-frequency energy conversion and compound circuit Download PDFInfo
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- CN110064817A CN110064817A CN201910455627.9A CN201910455627A CN110064817A CN 110064817 A CN110064817 A CN 110064817A CN 201910455627 A CN201910455627 A CN 201910455627A CN 110064817 A CN110064817 A CN 110064817A
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- 238000003466 welding Methods 0.000 title claims abstract description 52
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 22
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- 230000008859 change Effects 0.000 claims abstract description 27
- 238000010891 electric arc Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 41
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- 230000009466 transformation Effects 0.000 claims description 15
- 230000000694 effects Effects 0.000 abstract description 8
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- 230000008569 process Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
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- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
- B23K9/091—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
- B23K9/1043—Power supply characterised by the electric circuit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
Abstract
The present invention provides a kind of fast frequency pulse TIG weldings to connect power supply low-and high-frequency energy conversion and compound circuit, it is characterised in that: including industrial frequency rectifying filter circuit, pulse current main circuit, background current main circuit, high-frequency current modulation circuit and control circuit；Pulse current main circuit includes sequentially connected SiC full-bridge inverting change of current module one, high frequency voltage changing module one and SiC rectification Leveling Block one；Background current main circuit includes sequentially connected SiC full-bridge inverting change of current module two, high frequency voltage changing module two and SiC rectification Leveling Block two；Industrial frequency rectifying filter circuit is connect with SiC full-bridge inverting change of current module one and SiC full-bridge inverting change of current module two respectively.Circuit reverse frequency is high, is lost low, can stablize the output regular fast frequency pulse current waveform of 20kHz or more, be conducive to improve electric arc control effect, make waveform it is regular stablize it is undistorted.
Description
Technical field
The present invention relates to technical field of welding equipment, connect power supply height more specifically to a kind of fast frequency pulse TIG welding
Frequency energy conversion and compound circuit.
Background technique
Pulse TIG welding connects with the wide advantage of arc stability, zero splashing, welding quality height, solderable metal range by extensive
Using, but traditional pulse TIG weld, since pulse frequency is lower, arc energy is not concentrated, and heat input is larger, result in compared with
Big heat affected area and coarse weld grain reduce weld properties.For existing for traditional pulse TIG weld these ask
Topic is currently suggested a kind of more advanced fast frequency pulse TIG welding and connects method.Since fast frequency pulse TIG welding joined high frequency arteries and veins
The modulation of electric current (20kHz or more) is rushed, the electromagnetic field that fast frequency electric current generates can shrink electric arc, formation and plasma arc
Similar contraction arc column shape electric arc.Therefore fast frequency pulse TIG welding can be improved the arc constriction degree of pulse TIG welding, improve electricity
Arc energy density and raising arc stiffness.
In recent years, fast frequency pulse TIG welding connection technology becomes the research emphasis that domestic pulse TIG welding connects field.In fast frequency arteries and veins
It rushes in TIG weld system, fast frequency pulse TIG welding connects power supply and provides energy for electric arc, and the performance of the source of welding current is most important.So
And the industrialized level of domestic TIG weld power-supply device is between developed country that there is also biggish gap, the power of power supply
Device mostly uses greatly IGBT, but since the factor of IGBT self structure causes to generate tail currents after shut-off, switching loss
It is larger, the reverse frequency of circuit, generally 20kHz are constrained, this makes package size excessive and control precision is lower.Another party
Face, modulation of the fast frequency pulse TIG welding technology due to joined high-frequency current can interfere the intense electromagnetic that the source of welding current generates,
Especially more very to the influence of power semiconductor, to unstable irregular, the high band electric arc of welding current easily occur
The problem of control effect difference.Therefore, factors limit the popularization and application of fast frequency pulse TIG welding connection technology at home.
Summary of the invention
To overcome shortcoming and deficiency of the prior art, high, loss that the purpose of the present invention is to provide a kind of reverse frequencies
It is low, the regular fast frequency pulse current waveform of output 20kHz or more can be stablized, be conducive to improve electric arc control effect, advise waveform
It is whole to stablize distortionless fast frequency pulse TIG welding and connect power supply low-and high-frequency energy conversion and compound circuit.
In order to achieve the above object, the technical scheme is that: a kind of fast frequency pulse TIG welding connects electricity
Source low-and high-frequency energy conversion and compound circuit, it is characterised in that: including industrial frequency rectifying filter circuit, pulse current main circuit, base
It is worth electric current main circuit, high-frequency current modulation circuit and control circuit；Industrial frequency rectifying filter circuit and three-phase alternating current input power connect
It connects；
The pulse current main circuit includes sequentially connected SiC full-bridge inverting change of current module one, high frequency voltage changing module one
Leveling Block one is rectified with SiC；The background current main circuit includes sequentially connected SiC full-bridge inverting change of current module two, height
Frequency voltage changing module two and SiC rectify Leveling Block two；Industrial frequency rectifying filter circuit respectively with SiC full-bridge inverting change of current module one and
SiC full-bridge inverting change of current module two connects；
The high-frequency current modulation circuit includes that sequentially connected high frequency modulation module and counnter attack fill module；Wherein, high frequency
Modulation module is connect with SiC rectification Leveling Block one, and counnter attack fills module and connect with external arc load；The SiC rectification
Leveling Block two is connect with external arc load.
Preferably, the SiC full-bridge inverting change of current module one includes SiC power switch tube M101, SiC power switch tube
M102, SiC power switch tube M103 and SiC power switch tube M104；The high frequency voltage changing module one includes high frequency transformer one
T101；SiC power switch tube M101, SiC power switch tube M102, SiC power switch tube M103 and the SiC power switch tube
M104 forms full bridge inverter, is connect later by capacitance C109 with the primary of one T101 of high frequency transformer；The SiC
Power switch tube M101, SiC power switch tube M102, SiC power switch tube M103 and SiC power switch tube M104 is in parallel respectively
There is RC absorbing circuit one；
The SiC rectification Leveling Block one includes rectifier diode VD101, rectifier diode VD102 and inductance L101；It is high
The first output end of secondary of one T101 of frequency power transformer passes through sequentially connected rectifier diode VD101 and rectifier diode VD102
It is connect with the secondary third output end of one T101 of high frequency transformer；The connection of rectifier diode VD101 and rectifier diode VD102
Place is connect with one end of inductance L101；The other end of inductance L101 and the secondary second output terminal of one T101 of high frequency transformer are distinguished
Output end as pulse current main circuit to connect with high frequency modulation module.
In pulse current main circuit, alternating current input power supplying access industrial frequency rectifying filter circuit is converted into smooth direct current
Electricity；Direct current is opened via SiC power switch tube M101, SiC power switch tube M102, SiC power switch tube M103 and SiC power
Close the full bridge inverter that pipe M104 is constituted, two diagonal SiC power switch tubes of pwm signal control of the two-way complementation with dead zone
High frequency is opened or is turned off simultaneously, and direct current is converted to high-frequency alternating current；Electricity is carried out by one T101 of high frequency transformer later
Air bound is from, transformation and power transfer；It is transformed into the smooth direct current of low pressure by SiC rectification Leveling Block one and is output to high-frequency electrical
Flow modulation circuit.
Preferably, SiC power switch tube M101, SiC power switch tube M102, the SiC power switch tube M103 and
SiC power switch tube M104 forms full bridge inverter, passes through the primary of capacitance C109 and high frequency voltage changing module one later
Connection；SiC power switch tube M101, SiC power switch tube M102, SiC power switch tube M103 and the SiC power switch tube
M104 is parallel with RC absorbing circuit one respectively, refers to:
Further include capacitor C101, capacitor C102, capacitor C103, capacitor C104, capacitor C109, resistance R101, resistance R102,
Resistance R103 and resistance R104；
After SiC power switch tube M101 and SiC power switch tube M103 series connection, with SiC power switch tube M102 and SiC function
The rate switching tube M104 circuit to be formed of connecting is parallel to together on industrial frequency rectifying filter circuit；Capacitor C101 and resistance R101 series connection
After be parallel on SiC power switch tube M101；SiC power switch tube M102 is parallel to after capacitor C102 and resistance R102 series connection
On；It is parallel on SiC power switch tube M103 after capacitor C103 and resistance R103 series connection；After capacitor C104 and resistance R104 series connection
It is parallel on SiC power switch tube M104；The junction of the SiC power switch tube M101 and SiC power switch tube M103 with
It is connect after capacitor C109 series connection with the primary first input end of high frequency voltage changing module one；SiC the power switch tube M102 and SiC
The junction of power switch tube M104 is connect with the second input terminal of primary of high frequency voltage changing module one.
Preferably, the SiC power switch tube M101 is also parallel with diode D101；SiC power switch tube M102 is also simultaneously
It is associated with diode D102；SiC power switch tube M103 is also parallel with diode D103；SiC power switch tube M104 is also parallel with
Diode D104.
Preferably, the circuit structure of the SiC full-bridge inverting change of current module two and one phase of SiC full-bridge inverting change of current module
Together；The circuit structure of high frequency voltage changing module two is identical as high frequency voltage changing module one；SiC rectify Leveling Block two circuit structure with
It is identical that SiC rectifies Leveling Block one.The structure and principle of background current main circuit are identical as pulse current main circuit, only controlling party
Formula is different, and existing way can be used in control mode.
Preferably, the high frequency modulation module includes modulation switch pipe IGBT Q202 and modulation switch pipe IGBT Q201；
It includes rectifier diode VD201 that the counnter attack, which fills module,；It is flat that the modulation switch pipe IGBT Q201 is connected in parallel on the SiC rectification
On sliding formwork block one；SiC rectifies Leveling Block one and passes through sequentially connected modulation switch pipe IGBT Q202 and rectifier diode
VD201 is connect with external arc load；The modulation switch pipe IGBT Q202 is parallel with peak voltage absorption module one；Modulation
Switching tube IGBT Q201 is parallel with peak voltage absorption module two.
Preferably, the peak voltage absorption module one includes capacitor C202, resistance R202, diode D204 and diode
D203；The circuit in parallel to be formed is connected after resistance R202 and capacitor C202 is in parallel with diode D204 to modulation switch pipe IGBT
On Q202；Diode D203 is connected in parallel on modulation switch pipe IGBT Q202；
The peak voltage absorption module two includes capacitor C201, resistance R201, diode D202 and diode D201；Electricity
It is connected on the circuit in parallel to be formed to modulation switch pipe IGBT Q201 after resistance R201 and diode D202 are in parallel with capacitor C201；
Diode D201 is connected in parallel on modulation switch pipe IGBT Q201.
In high-frequency current modulation circuit, modulation switch pipe is input to by the low-voltage DC that pulse current main circuit exports
The high frequency modulation module that IGBT Q201 and modulation switch pipe IGBT Q202 is constituted, two-way complementation are controlled without the pwm signal in dead zone
Modulation switch pipe IGBT Q201, which is replaced with modulation switch pipe IGBT Q202 with 20kHz or higher frequency, opens shutdown, will be straight
Galvanic electricity is converted to high-frequency current, is superimposed, is superimposed with the low-voltage DC of background current main circuit output after counnter attack fills module
The fast frequency pulse current generated is output to external arc load；Peak voltage absorption module one and peak voltage absorption module two are right
The peak voltage that modulation high-frequency current process generates is absorbed；Rectifier diode VD201 prevents background current main circuit from exporting
Direct current fill reversion pulse electric current main circuit by the way that the internal resistance of high-frequency current modulation circuit is counter, avoid the accurate output for influencing power supply from controlling
System.
The present invention is that contravariant direct current, pulse TIG welding connect power supply energy transformation and compound circuit, output electric current either
Fast frequency pulse current, is also possible to normal pulse current flow and DC current.SiC power switch tube is quickly led according to preset timing
High-frequency direct-current exchange transformation is realized in logical and closing；Two modulation switch pipe IGBT of high frequency modulation module are with 20kHz or higher
Frequency alternation switch realizes the modulation of high-frequency pulse current；It is connect in power supply in fast frequency pulse TIG welding, the pulse electricity of two-way parallel connection
The output voltage current sample for flowing main circuit and background current main circuit feeds back independent control；By in pulse current main circuit and
The output end of background current main circuit acquires output Current Voltage respectively and carries out signal condition, is compared it with preset value
Afterwards, it conducting and the turn-off time for changing SiC power switch tube, realizes duty cycle adjustment, obtains required waveform output, complete to close
Ring control.
Compared to existing fast frequency TIG weld power technology, the present invention uses the electric and electronic power device of new generation based on SiC
Part improves reverse frequency to 200kHz, improves welding current control precision, reinforce high band electric arc control effect, stablize output
Regular fast frequency pulse current.In addition, the fast frequency pulse TIG welding using SiC power switch tube development connects power supply, since superelevation is inverse
Frequency, so that the volume and quality of transformer are substantially reduced；Simultaneously as SiC power switch tube switching speed is fast, open
It is extremely low to close loss, realizes the work of hyperfrequency switch state, using the minimum core material of iron loss, transformation can be further reduced
The volume and weight of the magnetic devices such as device reduces magnetic losses, improves energy conversion efficiency.On the other hand, due to reverse frequency
It improves, loop time becomes smaller, and can be realized the high speed to output Current Voltage, precise treatment regulation, improves in fast frequency pulse TIG
In welding process to the control effect of high band electric arc, control welding current waveform it is regular stablize it is undistorted.
One of the key that the fast frequency pulse TIG welding of the present invention connects power supply low-and high-frequency energy conversion and compound circuit is high-frequency electrical
Flow modulation circuit.The topology that existing pulse current modulation circuit is connected in parallel on power output end frequently with single power switch tube is tied
Structure, since the impedance of source of welding current arc load is less than the internal resistance of parallel IGBT, while parallel IGBT conducting still
Some output electric current flows into arc load, can not export regular fast frequency pulse current waveform.For this problem, this hair
High-frequency current modulation circuit in bright uses interlock type topological structure, when modulation switch pipe IGBT Q201 is connected, on output loop
Concatenated modulation switch pipe IGBT Q202 shutdown, cutting output electric current flow into the path of arc load.Modulation switch pipe IGBT
Q201 is mutually restricted with modulation switch pipe IGBT Q202, alternation switch, it is ensured that pulse current main circuit export electric current all via
Modulation switch pipe IGBT Q201 flows back to cathode by positive pole.The modulation switch pipe IGBT Q201 of interlock type topology is opened with modulation
Pipe IGBT Q202 is closed with 20kHz or higher frequency alternation switch, realizes the modulation of high-frequency pulse current.
Compared with prior art, the invention has the advantages that with the utility model has the advantages that
1, the device for power switching of circuit of the present invention is all using power electronic devices SiC power device of new generation, switch
Frequency is higher, has preferable dynamic responding speed, and the dynamic response capability of 20kHz frequency pulse electric current can achieve 4.7 μ s；
High-efficient, efficiency is up to 90.6%, and efficiency is able to maintain 90% or so when power reaches 3500W or more；
2, circuit of the present invention is conducive to reinforce high band electric arc control effect, stablizes the regular fast of output 20kHz or more
Frequency pulse current waveform, in welding process waveform it is regular stablize it is undistorted；
3, circuit of the present invention, high-frequency current modulation circuit can either effectively absorb the generation of high-frequency pulse current modulated process
Sharp pulse overvoltage, and fast frequency pulse current basic waveform will not be destroyed, structure is simple, at low cost, high reliablity.
Detailed description of the invention
Fig. 1 is the circuit block diagram that fast frequency pulse TIG welding of the invention connects power supply low-and high-frequency energy conversion and compound circuit；
Fig. 2 is the overall topology that fast frequency pulse TIG welding of the invention connects power supply low-and high-frequency energy conversion and compound circuit
Circuit diagram；
Fig. 3 is that fast frequency pulse TIG welding of the invention connects the main electricity of pulse current in power supply low-and high-frequency energy conversion and compound circuit
The circuit diagram on road；
Fig. 4 is that fast frequency pulse TIG welding of the invention connects power supply low-and high-frequency energy conversion and compound circuit high-frequency current is modulated
The circuit diagram of circuit.
Specific embodiment
The present invention is described in further detail with specific embodiment with reference to the accompanying drawing.
Embodiment
A kind of fast frequency pulse TIG welding of the present embodiment connects power supply low-and high-frequency energy conversion and compound circuit, and structure such as Fig. 1 is extremely
Shown in Fig. 4；Including industrial frequency rectifying filter circuit, pulse current main circuit, background current main circuit, high-frequency current modulation circuit and
Control circuit；Industrial frequency rectifying filter circuit is connect with three-phase alternating current input power.
Pulse current main circuit includes sequentially connected SiC full-bridge inverting change of current module one, high frequency voltage changing module one and SiC
Rectify Leveling Block one；The background current main circuit includes sequentially connected SiC full-bridge inverting change of current module two, high frequency transformation
Module two and SiC rectify Leveling Block two；Industrial frequency rectifying filter circuit is complete with SiC full-bridge inverting change of current module one and SiC respectively
Bridge inverse transformation flow module two connects.
High-frequency current modulation circuit includes that sequentially connected high frequency modulation module and counnter attack fill module；Wherein, high frequency modulated
Module is connect with SiC rectification Leveling Block one, and counnter attack fills module and connect with external arc load；The SiC rectification is smooth
Module two is connect with external arc load.
SiC full-bridge inverting change of current module one includes SiC power switch tube M101, SiC power switch tube M102, SiC power
Switching tube M103 and SiC power switch tube M104；The high frequency voltage changing module one includes one T101 of high frequency transformer；The SiC
Power switch tube M101, SiC power switch tube M102, SiC power switch tube M103 and SiC power switch tube M104 forms full-bridge
Inverter circuit is connect by capacitance C109 with the primary of one T101 of high frequency transformer later；The SiC power switch tube
M101, SiC power switch tube M102, SiC power switch tube M103 and SiC power switch tube M104 are parallel with RC respectively and absorb electricity
Lu Yi；
It includes rectifier diode VD101, rectifier diode VD102 and inductance L101 that SiC, which rectifies Leveling Block one,；High frequency becomes
The first output end of secondary of one T101 of depressor passes through sequentially connected rectifier diode VD101 and rectifier diode VD102 and height
The secondary third output end of one T101 of frequency power transformer connects；The junction of rectifier diode VD101 and rectifier diode VD102 with
One end of inductance L101 connects；The secondary second output terminal of the other end of inductance L101 and one T101 of high frequency transformer respectively as
The output end of pulse current main circuit to connect with high frequency modulation module.
Specifically, SiC full-bridge inverting change of current module one further includes capacitor C101, capacitor C102, capacitor C103, capacitor
C104, capacitor C109, resistance R101, resistance R102, resistance R103 and resistance R104；
After SiC power switch tube M101 and SiC power switch tube M103 series connection, with SiC power switch tube M102 and SiC function
The rate switching tube M104 circuit to be formed of connecting is parallel to together on industrial frequency rectifying filter circuit；Capacitor C101 and resistance R101 series connection
After be parallel on SiC power switch tube M101；SiC power switch tube M102 is parallel to after capacitor C102 and resistance R102 series connection
On；It is parallel on SiC power switch tube M103 after capacitor C103 and resistance R103 series connection；After capacitor C104 and resistance R104 series connection
It is parallel on SiC power switch tube M104；The junction of the SiC power switch tube M101 and SiC power switch tube M103 with
It is connect after capacitor C109 series connection with the primary first input end of high frequency voltage changing module one；SiC the power switch tube M102 and SiC
The junction of power switch tube M104 is connect with the second input terminal of primary of high frequency voltage changing module one.
SiC power switch tube M101 is also parallel with diode D101；SiC power switch tube M102 is also parallel with diode
D102；SiC power switch tube M103 is also parallel with diode D103；SiC power switch tube M104 is also parallel with diode D104.
In pulse current main circuit, alternating current input power supplying access industrial frequency rectifying filter circuit is converted into smooth direct current
Electricity；Direct current is opened via SiC power switch tube M101, SiC power switch tube M102, SiC power switch tube M103 and SiC power
Close the full bridge inverter that pipe M104 is constituted, two diagonal SiC power switch tubes of pwm signal control of the two-way complementation with dead zone
High frequency is opened or is turned off simultaneously, and direct current is converted to high-frequency alternating current；Electricity is carried out by one T101 of high frequency transformer later
Air bound is from, transformation and power transfer；It is transformed into the smooth direct current of low pressure by SiC rectification Leveling Block one and is output to high-frequency electrical
Flow modulation circuit.
SiC power switch tube M101, SiC power switch tube M102, SiC power in SiC full-bridge inverting change of current module one
Switching tube M103 and SiC power switch tube M104 is connect with SiC drive module respectively, and SiC drive module is connect with control module,
To realize SiC power switch tube M101, SiC power switch tube M102, SiC power switch tube M103 and SiC power switch tube
M104 presses default timing respectively and realizes fast conducting and close.The prior art can be used in SiC drive module and control module, such as
SiC drive module is (public using Chinese invention patent application " the digital SiC contravariant Multifunctional argon arc welding power supply based on DSC "
The number of opening: 106392262B) in be disclosed in detail SiC high-frequency drive module.
The circuit structure of SiC full-bridge inverting change of current module two is identical as SiC full-bridge inverting change of current module one；High frequency transformation mould
The circuit structure of block two is identical as high frequency voltage changing module one；SiC rectifies the circuit structure of Leveling Block two and SiC rectifies smooth mould
Block one is identical.The structure and principle of background current main circuit are identical as pulse current main circuit.
For drive SiC power switch tube in SiC full-bridge inverting change of current module two SiC drive module can also with for driving
The SiC drive module of SiC power switch tube is identical in dynamic SiC full-bridge inverting change of current module one；Between two drive modules only
It is output driving waveform and timing difference；Existing way can be used in drive waveforms and timing.
High frequency modulation module includes modulation switch pipe IGBT Q202 and modulation switch pipe IGBT Q201；The counnter attack fills mould
Block includes rectifier diode VD201；The modulation switch pipe IGBT Q201 is connected in parallel on the SiC rectification Leveling Block one；
SiC rectifies Leveling Block one and passes through sequentially connected modulation switch pipe IGBT Q202 and rectifier diode VD201 and external electric arc
Load connection；The modulation switch pipe IGBT Q202 is parallel with peak voltage absorption module one；Modulation switch pipe IGBT Q201
It is parallel with peak voltage absorption module two.
Peak voltage absorption module one includes capacitor C202, resistance R202, diode D204 and diode D203；Resistance
It is connected on the circuit in parallel to be formed to modulation switch pipe IGBT Q202 after R202 and capacitor C202 are in parallel with diode D204；Two
Pole pipe D203 is connected in parallel on modulation switch pipe IGBT Q202；
The peak voltage absorption module two includes capacitor C201, resistance R201, diode D202 and diode D201；Electricity
It is connected on the circuit in parallel to be formed to modulation switch pipe IGBT Q201 after resistance R201 and diode D202 are in parallel with capacitor C201；
Diode D201 is connected in parallel on modulation switch pipe IGBT Q201.
Modulation switch pipe IGBT Q202 and modulation switch pipe the IGBT Q201 of high frequency modulation module drive with IGBT respectively
Module connection, IGBT drive module is connect with control module, to realize modulation switch pipe IGBT Q202 and modulation switch pipe IGBT
Q201 presses default timing conducting respectively and closes.The prior art can be used in IGBT drive module, for example, by using Chinese invention patent
Apply for that the high-frequency inversion being disclosed in detail in " multifunctional digital wave control arc welding inverter " (publication number: 103692056B) drives mould
Block.
In high-frequency current modulation circuit, modulation switch pipe is input to by the low-voltage DC that pulse current main circuit exports
The high frequency modulation module that IGBT Q201 and modulation switch pipe IGBT Q202 is constituted, two-way complementation are controlled without the pwm signal in dead zone
Modulation switch pipe IGBT Q201, which is replaced with modulation switch pipe IGBT Q202 with 20kHz or higher frequency, opens shutdown, will be straight
Galvanic electricity is converted to high-frequency current, is superimposed, is superimposed with the low-voltage DC of background current main circuit output after counnter attack fills module
The fast frequency pulse current generated is output to external arc load；Peak voltage absorption module one and peak voltage absorption module two are right
The peak voltage that modulation high-frequency current process generates is absorbed；Rectifier diode VD201 prevents background current main circuit from exporting
Direct current fill reversion pulse electric current main circuit by the way that the internal resistance of high-frequency current modulation circuit is counter, avoid the accurate output for influencing power supply from controlling
System.
The present invention is that contravariant direct current, pulse TIG welding connect power supply energy transformation and compound circuit, output electric current either
Fast frequency pulse current, is also possible to normal pulse current flow and DC current.SiC power switch tube is quickly led according to preset timing
High-frequency direct-current exchange transformation is realized in logical and closing；Two modulation switch pipe IGBT of high frequency modulation module are with 20kHz or higher
Frequency alternation switch realizes the modulation of high-frequency pulse current；It is connect in power supply in fast frequency pulse TIG welding, the pulse electricity of two-way parallel connection
The output voltage current sample for flowing main circuit and background current main circuit feeds back independent control；By in pulse current main circuit and
The output end of background current main circuit acquires output Current Voltage respectively and carries out signal condition, is compared it with preset value
Afterwards, it conducting and the turn-off time for changing SiC power switch tube, realizes duty cycle adjustment, obtains required waveform output, complete to close
Ring control.
Compared to existing fast frequency TIG weld power technology, the present invention uses the electric and electronic power device of new generation based on SiC
Part improves reverse frequency to 200kHz, improves welding current control precision, reinforce high band electric arc control effect, stablize output
Regular fast frequency pulse current.In addition, the fast frequency pulse TIG welding using SiC power switch tube development connects power supply, since superelevation is inverse
Frequency, so that the volume and quality of transformer are substantially reduced；Simultaneously as SiC power switch tube switching speed is fast, open
It is extremely low to close loss, realizes the work of hyperfrequency switch state, using the minimum core material of iron loss, transformation can be further reduced
The volume and weight of the magnetic devices such as device reduces magnetic losses, improves energy conversion efficiency.On the other hand, due to reverse frequency
It improves, loop time becomes smaller, and can be realized the high speed to output Current Voltage, precise treatment regulation, improves in fast frequency pulse TIG
In welding process to the control effect of high band electric arc, control welding current waveform it is regular stablize it is undistorted.
One of the key that the fast frequency pulse TIG welding of the present invention connects power supply low-and high-frequency energy conversion and compound circuit is high-frequency electrical
Flow modulation circuit.The topology that existing pulse current modulation circuit is connected in parallel on power output end frequently with single power switch tube is tied
Structure, since the impedance of source of welding current arc load is less than the internal resistance of parallel IGBT, while parallel IGBT conducting still
Some output electric current flows into arc load, can not export regular fast frequency pulse current waveform.For this problem, this hair
High-frequency current modulation circuit in bright uses interlock type topological structure, when modulation switch pipe IGBT Q201 is connected, on output loop
Concatenated modulation switch pipe IGBT Q202 shutdown, cutting output electric current flow into the path of arc load.Modulation switch pipe IGBT
Q201 is mutually restricted with modulation switch pipe IGBT Q202, alternation switch, it is ensured that pulse current main circuit export electric current all via
Modulation switch pipe IGBT Q201 flows back to cathode by positive pole.The modulation switch pipe IGBT Q201 of interlock type topology is opened with modulation
Pipe IGBT Q202 is closed with 20kHz or higher frequency alternation switch, realizes the modulation of high-frequency pulse current.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (7)
1. a kind of fast frequency pulse TIG welding connects power supply low-and high-frequency energy conversion and compound circuit, it is characterised in that: including industrial frequency rectifying
Filter circuit, pulse current main circuit, background current main circuit, high-frequency current modulation circuit and control circuit；Industrial frequency rectifying filter
Wave circuit is connect with three-phase alternating current input power；
The pulse current main circuit includes sequentially connected SiC full-bridge inverting change of current module one, high frequency voltage changing module one and SiC
Rectify Leveling Block one；The background current main circuit includes sequentially connected SiC full-bridge inverting change of current module two, high frequency transformation
Module two and SiC rectify Leveling Block two；Industrial frequency rectifying filter circuit is complete with SiC full-bridge inverting change of current module one and SiC respectively
Bridge inverse transformation flow module two connects；
The high-frequency current modulation circuit includes that sequentially connected high frequency modulation module and counnter attack fill module；Wherein, high frequency modulated
Module is connect with SiC rectification Leveling Block one, and counnter attack fills module and connect with external arc load；The SiC rectification is smooth
Module two is connect with external arc load.
2. fast frequency pulse TIG welding according to claim 1 connects power supply low-and high-frequency energy conversion and compound circuit, feature exists
In: the SiC full-bridge inverting change of current module one includes that SiC power switch tube M101, SiC power switch tube M102, SiC power is opened
Close pipe M103 and SiC power switch tube M104；The high frequency voltage changing module one includes one T101 of high frequency transformer；The SiC function
It is inverse that rate switching tube M101, SiC power switch tube M102, SiC power switch tube M103 and SiC power switch tube M104 forms full-bridge
Power transformation road is connect by capacitance C109 with the primary of one T101 of high frequency transformer later；The SiC power switch tube
M101, SiC power switch tube M102, SiC power switch tube M103 and SiC power switch tube M104 are parallel with RC respectively and absorb electricity
Lu Yi；
The SiC rectification Leveling Block one includes rectifier diode VD101, rectifier diode VD102 and inductance L101；High frequency becomes
The first output end of secondary of one T101 of depressor passes through sequentially connected rectifier diode VD101 and rectifier diode VD102 and height
The secondary third output end of one T101 of frequency power transformer connects；The junction of rectifier diode VD101 and rectifier diode VD102 with
One end of inductance L101 connects；The secondary second output terminal of the other end of inductance L101 and one T101 of high frequency transformer respectively as
The output end of pulse current main circuit to connect with high frequency modulation module.
3. fast frequency pulse TIG welding according to claim 2 connects power supply low-and high-frequency energy conversion and compound circuit, feature exists
In: SiC power switch tube M101, SiC power switch tube M102, SiC power switch tube M103 and the SiC power switch tube
M104 forms full bridge inverter, is connect later by capacitance C109 with the primary of high frequency voltage changing module one；The SiC function
Rate switching tube M101, SiC power switch tube M102, SiC power switch tube M103 and SiC power switch tube M104 is parallel with respectively
RC absorbing circuit one, refers to:
It further include capacitor C101, capacitor C102, capacitor C103, capacitor C104, capacitor C109, resistance R101, resistance R102, resistance
R103 and resistance R104；
After SiC power switch tube M101 and SiC power switch tube M103 series connection, opened with SiC power switch tube M102 and SiC power
The pipe M104 circuit to be formed of connecting is closed to be parallel to together on industrial frequency rectifying filter circuit；After capacitor C101 and resistance R101 series connection simultaneously
It is linked on SiC power switch tube M101；It is parallel on SiC power switch tube M102 after capacitor C102 and resistance R102 series connection；Electricity
It is parallel on SiC power switch tube M103 after holding C103 and resistance R103 series connection；It is in parallel after capacitor C104 and resistance R104 series connection
Onto SiC power switch tube M104；The junction of the SiC power switch tube M101 and SiC power switch tube M103 and capacitor
It is connect after C109 series connection with the primary first input end of high frequency voltage changing module one；The SiC power switch tube M102 and SiC power
The junction of switching tube M104 is connect with the second input terminal of primary of high frequency voltage changing module one.
4. fast frequency pulse TIG welding according to claim 2 connects power supply low-and high-frequency energy conversion and compound circuit, feature exists
In: the SiC power switch tube M101 is also parallel with diode D101；SiC power switch tube M102 is also parallel with diode
D102；SiC power switch tube M103 is also parallel with diode D103；SiC power switch tube M104 is also parallel with diode D104.
5. fast frequency pulse TIG welding according to claim 2 connects power supply low-and high-frequency energy conversion and compound circuit, feature exists
In: the circuit structure of the SiC full-bridge inverting change of current module two is identical as SiC full-bridge inverting change of current module one；High frequency transformation mould
The circuit structure of block two is identical as high frequency voltage changing module one；SiC rectifies the circuit structure of Leveling Block two and SiC rectifies smooth mould
Block one is identical.
6. fast frequency pulse TIG welding according to claim 2 connects power supply low-and high-frequency energy conversion and compound circuit, feature exists
In: the high frequency modulation module includes modulation switch pipe IGBT Q202 and modulation switch pipe IGBT Q201；The counnter attack fills mould
Block includes rectifier diode VD201；The modulation switch pipe IGBT Q201 is connected in parallel on the SiC rectification Leveling Block one；
SiC rectifies Leveling Block one and passes through sequentially connected modulation switch pipe IGBT Q202 and rectifier diode VD201 and external electric arc
Load connection；The modulation switch pipe IGBT Q202 is parallel with peak voltage absorption module one；Modulation switch pipe IGBT Q201
It is parallel with peak voltage absorption module two.
7. fast frequency pulse TIG welding according to claim 6 connects power supply low-and high-frequency energy conversion and compound circuit, feature exists
In: the peak voltage absorption module one includes capacitor C202, resistance R202, diode D204 and diode D203；Resistance
It is connected on the circuit in parallel to be formed to modulation switch pipe IGBT Q202 after R202 and capacitor C202 are in parallel with diode D204；Two
Pole pipe D203 is connected in parallel on modulation switch pipe IGBT Q202；
The peak voltage absorption module two includes capacitor C201, resistance R201, diode D202 and diode D201；Resistance
It is connected on the circuit in parallel to be formed to modulation switch pipe IGBT Q201 after R201 and diode D202 are in parallel with capacitor C201；Two
Pole pipe D201 is connected in parallel on modulation switch pipe IGBT Q201.
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| CN201910455627.9A CN110064817A (en) | 2019-05-29 | 2019-05-29 | Fast frequency pulse TIG welding connects power supply low-and high-frequency energy conversion and compound circuit |
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| CN110064822A (en) * | 2019-05-29 | 2019-07-30 | 华南理工大学 | A kind of fast frequency pulse TIG welding welding system |
| CN111181532A (en) * | 2019-12-30 | 2020-05-19 | 河北建材职业技术学院 | Blocking type high-frequency pulse current generating circuit |
| CN111545882A (en) * | 2020-05-19 | 2020-08-18 | 北京工业大学 | Arc energy adjusting device and method |
| CN111975178A (en) * | 2020-07-17 | 2020-11-24 | 华南理工大学 | Welding pool balanced oscillation pulse deep-melting lockhole TIG welding system and welding method thereof |
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| CN111975178A (en) * | 2020-07-17 | 2020-11-24 | 华南理工大学 | Welding pool balanced oscillation pulse deep-melting lockhole TIG welding system and welding method thereof |
| CN111975178B (en) * | 2020-07-17 | 2024-03-26 | 华南理工大学 | Molten pool balance oscillation pulse deep-melting locking hole TIG welding system and welding method thereof |
| CN113890408A (en) * | 2021-10-22 | 2022-01-04 | 南京工业大学 | Active oscillation pulse type micro-arc oxidation power supply system and discharge control method |
| CN114654049A (en) * | 2022-02-28 | 2022-06-24 | 华南理工大学 | SiC module-based fast frequency and polarity-variable TIG welding power supply and system |
| CN114654049B (en) * | 2022-02-28 | 2023-08-22 | 华南理工大学 | Quick-frequency-change polarity TIG welding power supply and system based on SiC module |
| CN115846822A (en) * | 2023-01-30 | 2023-03-28 | 华南理工大学 | All-position local dry-method underwater fast-frequency TIG welding system |
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