CN103586564A - MIG welding power supply system based on STM32 - Google Patents

MIG welding power supply system based on STM32 Download PDF

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Publication number
CN103586564A
CN103586564A CN201310516396.0A CN201310516396A CN103586564A CN 103586564 A CN103586564 A CN 103586564A CN 201310516396 A CN201310516396 A CN 201310516396A CN 103586564 A CN103586564 A CN 103586564A
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module
diode
stm32
output
electric capacity
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CN103586564B (en
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董重里
吴开源
李顺华
李华佳
胡平
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South China University of Technology SCUT
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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South China University of Technology SCUT
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/10Other electric circuits therefor; Protective circuits; Remote controls
    • B23K9/1006Power supply
    • B23K9/1043Power supply characterised by the electric circuit
    • B23K9/1056Power supply characterised by the electric circuit by using digital means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/095Monitoring or automatic control of welding parameters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/16Arc welding or cutting making use of shielding gas
    • B23K9/173Arc welding or cutting making use of shielding gas and of a consumable electrode

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses an MIG welding power supply system based on STM32. The MIG welding power supply system comprises an inversion main circuit and a control circuit. The inversion main circuit comprises an input rectifying filter module, a high-frequency inverting module, a power transformation module and an output rectifying filter module which are sequentially and electrically connected. The control circuit comprises an SMT32 digital control module, a voltage-current detecting module, a fault protecting module, a man-machine interface module and a high-frequency drive module. The man-machine interface module realizes welding parameter giving through a digital pulse encoder. The MIG welding power supply system has the advantages that an STM32 chip is used to control the pulse MIG welding power supply system, system structure is simple, the control function is achieved through software, high anti-interference capability is achieved, and the problems that traditional pulse MIG welding power supply system is complex in structure, large in size, and inaccurate in parameter giving, and the like are solved.

Description

Pulse MIG Welding Power Source system based on STM32
Technical field
The present invention relates to a kind of Pulse MIG Welding Power Source system based on STM32.
Background technology
Pulse MIC welding technology is used for high performance automatic welding occasion, it integrates high-efficiency high-quality and automation, its outstanding process characteristic is: zone of welding current is wider, be that pulse MIC welding can obtain spray transfer under average current is less than the condition of critical electric current value, comprise that short circuiting transfer is to all galvanic areas of spray transfer; Molten bath volume is little, and the heating of droplet transfer and molten pool metal is intermittent, and the difficult stream that drops down can complete horizontal position welding, vertical position welding smoothly, is conducive to realize all position welding; Droplet transfer process controllability is more intense, both can obtain larger fusion penetration (because of pulse current amplitude large), can control again total average welding current in lower level, can effectively control heat input.
Being growing more intense along with market competition in recent years, improve welding productivity, guarantee product quality, realize automation, the intelligent attention that more and more obtains welding manufacturing enterprise that welding is produced, particularly the higher occasion of welding quality and required precision is all the more so during robot welding.Add incorporating of the new and high technologies such as modern artificial intelligence technology, digital information treatment technology, computer vision technique, also impel pulse MIC welding technology just towards welding high-speed and high-efficiency, welding digital control, the development of control system intelligent direction.
Existing pulse MIC welding technology mainly contains the shortcoming of the following aspects:
(1) complex structure.Tradition Pulse MIG Welding Power Source is to adopt analog control system to realize to control, and component number is many, and complex structure is bulky.
(2) control underaction, accurately.Traditional analog control system carries out the limited in one's ability of complex process, and component number is many, and the parameter of control system determines by the parameter of the discrete components such as resistance, electric capacity, and control system debugging is complicated, very flexible; The parameter distribution of resistance, electric capacity affects the uniformity of control system simultaneously, and the poor stability of parameter, as the stability of temperature drift effects control system.
Summary of the invention
Technical problem to be solved by this invention, is just to provide a kind of Pulse MIG Welding Power Source system based on STM32, and its component number is few, simple in structure, volume is little, simple and flexible is debugged in control and parameter accurate stable is good.
Solve the problems of the technologies described above, the present invention adopts following technical scheme:
A Pulse MIG Welding Power Source system of STM32, comprises inverter main circuit and control circuit; Described inverter main circuit comprises input rectifying filtration module, high-frequency inversion module, power voltage changing module and the output rectification filter module of electrical connection successively; The input of input rectifying filtration module is connected with three-phase alternating current input electrical network, the output of output rectification filter module is connected with arc load;
Described control circuit comprises STM32 Digital Control module, electric current and voltage detection module, error protection module, human-computer interface module and high-frequency drive module; Electric current and voltage detection module is inputted arc load, is exported STM32 Digital Control module to; error protection module input three-phase alternating current, export STM32 Digital Control module to, STM32 Digital Control module except with the interconnected communication of human-computer interface module also through high-frequency drive module, be connected to high-frequency inversion module.
Described STM32 Digital Control module is for adopting control chip STM32F103ZET6, the feedback voltage current parameters and the given voltage and current parameter of human-computer interface module that according to electric current and voltage detection module, detect arc load carry out PI computing, issue the embedded phase-shift PWM module control signal of STM32, phase-shift PWM module produces four tunnel phase-shift PWM signals, and by high-frequency drive module, amplify switching tube IGBT the turning on and off under no-voltage of going to control high-frequency inversion module, carry out Pulse MIG Welding Power Source output pulse current and Control of Voltage; Described human-computer interface module adopts digital pulse coding device to realize the accurately given of welding parameter, and human-computer interface module shows welding parameter in real time.
Described error protection module comprises interconnective over-voltage detection circuit, undervoltage detection circuit, over-current detection circuit and excess temperature testing circuit, AND circuit and peripheral circuit.
It is to strengthen driving force by high-frequency drive module that described PWM drives signal.
A kind of inverter main circuit for the Pulse MIG Welding Power Source system based on STM32, comprise input rectifying bridge (BR1), first to fourth IGBT switching tube (VT1~VT4), on each switching tube with parasitic diode and parasitic capacitance (C9~C12), first is connected successively respectively with the 4th switching tube (VT2 and VT4) with the 3rd switching tube (VT1 and VT3), second after parallel connection again, separately there are the first electric capacity and the 3rd electric capacity (C1 and C3), the second electric capacity and the 4th electric capacity (C2 and C4) after parallel connection, to connect again respectively, the forward output of input rectifying bridge (BR1) after inductance (L1), be added in anodal and the 3rd electric capacity (C3) of the first electric capacity (C1) one end, oppositely export one end of the second electric capacity (C2) negative pole and the 4th electric capacity (C4) to, output between the first switching tube and the 3rd switching tube (VT1 and VT3) or input are through the 5th electric capacity capacitance (C5) of parallel connection, after the 6th electric capacity capacitance (C6) again through last tremendously high frequency isolating transformer (T1) input of the second inductance resonant inductance (L2), output between second switch pipe and the 4th switching tube (VT2 and VT4) or input to another input of high-frequency isolation transformer (T1), the brachium pontis that the first and the 3rd switching tube (VT1 and VT3) forms is leading-bridge, the brachium pontis that the second and the 4th switching tube (VT2 and VT4) forms is lagging leg, 2 IGBT switching tubes of each brachium pontis become 180 ° of complementary conductings, the angle of flow between two brachium pontis differs a phase place,
Output rectifier and filter: the 5th diode and the 6th diode (V5 and V6), the 7th diode and the 8th diode (V7 and V8) are in parallel respectively, the 5th diode in parallel and the positive pole of the 6th diode (V5 and V6) connect an output of high-frequency isolation transformer (T1), the 7th diode in parallel and the positive pole of the 8th diode (V7 and V8) connect another output of high-frequency isolation transformer (T1), on the 5th diode in parallel and the 6th diode (V5 and V6), be also parallel with the first absorption resistance and the 7th electric capacity (C7), the first absorption resistance is the 5th resistance and the 6th resistance (R5 and R6) in parallel, equally, on the 7th diode in parallel and the 8th diode (V7 and V8), be also parallel with the second absorption resistance and the 8th electric capacity (C8), the second absorption resistance is the 7th resistance and the 8th resistance (R7 and R8) in parallel, the negative pole of the 5th diode to the eight diodes (V5~V8) is that one end of output, the other end of output are the centre tap of high-frequency isolation transformer (T1) after the 3rd inductance (L3).
Operation principle of the present invention:
The present invention adopts full-bridge phase-shift soft switch main circuit, by digital PI control algolithm and timer cycle interruption, realize output pulse current and Control of Voltage: three-phase main-frequency alternating current enters high-frequency inversion module become smooth direct current electricity after input rectifying filtration module after, then by power voltage changing module, output rectification filter module, enters arc load, meanwhile, feedback voltage current parameters and the given voltage and current parameter of human-computer interface module that STM32 Digital Control module detects arc load according to electric current and voltage detection module carry out after PI computing, issue control signal of the embedded phase-shift PWM module of STM32, make phase-shift PWM module produce four tunnel phase-shift PWM signals, and by high-frequency drive module, amplify switching tube IGBT the turning on and off under no-voltage go to control high-frequency inversion module, and obtain 20kHz high-frequency high-voltage, high-frequency high-voltage converts through overpower voltage changing module the low-voltage and high-current output that meets welding process requirement to again, through output rectification filter module, receive level and smooth welding current again, by this current impulse of process implementation source of welding current and Control of Voltage,
The overvoltage of error protection module, under-voltage, overcurrent and excess temperature testing circuit detect three-phase main-frequency voltage, primary current and radiator temperature; the electric current and voltage detecting and temperature signal, give error protection module; as there is the phenomenon of overvoltage, under-voltage, overcurrent and excess temperature; error protection module will give STM32 Digital Control module a low level fault guard signal; STM32 Digital Control module produces low level PWM by the switching tube of high-frequency drive module shuts down high-frequency inversion module, protection main circuit trouble free service.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
1. the present invention adopts STM32 chip to realize the Digital Control of Pulse MIG Welding Power Source, and simple in structure, system is flexible.
2. the present invention adopts pulse coder to realize the accurately given of welding parameter, has overcome traditional potentiometer and has realized the problems such as the given welding process not accurately causing of parameter is unstable.
3. the present invention adopts soft-switching inversion technology, has realized FR soft switch, has greatly reduced switching loss and the electric stress of power tube, has improved condition of work, has reduced electromagnetic interference, has improved overall efficiency.
Accompanying drawing explanation
Fig. 1 is overall structure block diagram of the present invention;
Fig. 2 is the circuit theory diagrams of inverter main circuit of the present invention;
Fig. 3 is the circuit theory diagrams of high-frequency drive module of the present invention;
Fig. 4 a is the voltage detecting circuit schematic diagram of electric current and voltage detection module of the present invention;
Fig. 4 b is the current detection circuit schematic diagram of electric current and voltage detection module of the present invention;
Fig. 5 is the circuit theory diagrams of error protection module of the present invention;
Fig. 6 is the structural representation of STM32 Digital Control module of the present invention;
Fig. 7 is the Pulse Electric flow graph of power-supply system of the present invention;
Fig. 8 is the program flow diagram of the control system based on STM32 of the present invention.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, the Pulse MIG Welding Power Source system embodiment based on STM32 of the present invention, comprises inverter main circuit and control circuit.
Inverter main circuit comprises input rectifying filtration module, high-frequency inversion module, power voltage changing module and the output rectification filter module of electrical connection successively; The input of input rectifying filtration module is connected with three-phase alternating current input electrical network, the output of output rectification filter module is connected with arc load.
Control circuit comprises STM32 Digital Control module, electric current and voltage detection module, error protection module, human-computer interface module and high-frequency drive module; Electric current and voltage detection module is inputted arc load, is exported STM32 Digital Control module to; error protection module input three-phase alternating current input voltage is conventional voltage check device, exports STM32 Digital Control module to, STM32 Digital Control module except with the interconnected communication of human-computer interface module also through high-frequency drive module, be connected to high-frequency inversion module.
STM32 Digital Control module adopts control chip STM32F103ZET6, the feedback voltage current parameters and the given voltage and current parameter of human-computer interface module that according to electric current and voltage detection module, detect arc load carry out after PI computing, issue control signal of the embedded phase-shift PWM module of STM32, make phase-shift PWM module produce four tunnel phase-shift PWM signals, and by high-frequency drive module, amplify switching tube IGBT the turning on and off under no-voltage go to control high-frequency inversion module, realize soft switch, realize the control of MIG weldering power supply output pulse current and voltage, described human-computer interface module adopts digital pulse coding device to realize the accurately given of welding parameter, and human-computer interface module shows welding parameter in real time.
Error protection module comprises interconnective over-voltage detection circuit, undervoltage detection circuit, over-current detection circuit and excess temperature testing circuit, AND circuit and peripheral circuit.Error protection module detects three-phase alternating current input voltage, is conventional voltage check device; Detecting excess temperature signal, is conventional temperature relay; Detection of primary over-current signal is conventional Hall current sensor.It is to strengthen driving force by high-frequency drive module that PWM drives signal.
Fig. 2 is the circuit theory diagrams of inverter main circuit of the present invention.Inverter main circuit adopts full-bridge phase-shifted soft switch converter, and its topological structure is comprised of input rectifying filter circuit, full bridge inverter, high-frequency isolation transformer, output rectifier and filter; Wherein BR1 is input rectifying bridge, and VT1~VT4 is 4 IGBT switching tubes, and on each switching tube, with parasitic diode and parasitic capacitance, L2 is resonant inductance, and C5, C6 are capacitances, and V5~V8 is output commutation diode, inductance L 3 composition output filter circuits.The brachium pontis that VT1 and VT3 form is leading-bridge, the brachium pontis that VT2 and VT4 form is lagging leg, 2 IGBT switching tubes of each brachium pontis become 180 ° of complementary conductings, the angle of flow between two brachium pontis differs a phase place, be phase shifting angle, by regulating this phase shifting angle just can regulation output voltage and current.In high-frequency converter loop, the parasitic capacitance of master power switch pipe and the stray inductance of isolating transformer, leakage inductance and resonant inductance etc. have formed a LC resonant tank, in device for power switching switching process, realize the change of current of no-voltage resonance, make it be operated in soft on off state, switching loss is low, and the electromagnetic stress of device significantly reduces.
A kind of inverter main circuit for the Pulse MIG Welding Power Source system based on STM32, comprise input rectifying bridge (BR1), first to fourth IGBT switching tube (VT1~VT4), on each switching tube with parasitic diode and parasitic capacitance (C9~C12), first is connected successively respectively with the 4th switching tube (VT2 and VT4) with the 3rd switching tube (VT1 and VT3), second after parallel connection again, separately there are the first electric capacity and the 3rd electric capacity (C1 and C3), the second electric capacity and the 4th electric capacity (C2 and C4) after parallel connection, to connect again respectively, the forward output of input rectifying bridge (BR1) after inductance (L1), be added in anodal and the 3rd electric capacity (C3) of the first electric capacity (C1) one end, oppositely export one end of the second electric capacity (C2) negative pole and the 4th electric capacity (C4) to, output between the first switching tube and the 3rd switching tube (VT1 and VT3) or input are through the 5th electric capacity capacitance (C5) of parallel connection, after the 6th electric capacity capacitance (C6) again through last tremendously high frequency isolating transformer (T1) input of the second inductance resonant inductance (L2), output between second switch pipe and the 4th switching tube (VT2 and VT4) or input to another input of high-frequency isolation transformer (T1), the brachium pontis that the first and the 3rd switching tube (VT1 and VT3) forms is leading-bridge, the brachium pontis that the second and the 4th switching tube (VT2 and VT4) forms is lagging leg, 2 IGBT switching tubes of each brachium pontis become 180 ° of complementary conductings, the angle of flow between two brachium pontis differs a phase place,
Output rectifier and filter: the 5th diode and the 6th diode (V5 and V6), the 7th diode and the 8th diode (V7 and V8) are in parallel respectively, the 5th diode in parallel and the positive pole of the 6th diode (V5 and V6) connect an output of high-frequency isolation transformer (T1), the 7th diode in parallel and the positive pole of the 8th diode (V7 and V8) connect another output of high-frequency isolation transformer (T1), on the 5th diode in parallel and the 6th diode (V5 and V6), be also parallel with the first absorption resistance and the 7th electric capacity (C7), the first absorption resistance is the 5th resistance and the 6th resistance (R5 and R6) in parallel, equally, on the 7th diode in parallel and the 8th diode (V7 and V8), be also parallel with the second absorption resistance and the 8th electric capacity (C8), the second absorption resistance is the 7th resistance and the 8th resistance (R7 and R8) in parallel, the negative pole of the 5th diode to the eight diodes (V5~V8) of output rectification is that one end of output, the other end of output are the centre tap of high-frequency isolation transformer (T1) through the 3rd inductance (L3).
The circuit theory diagrams of high-frequency drive module of the present invention as shown in Figure 3.The supply voltage of STM32 chip is 3.3V, the high speed pwm signal of its output also only has 3.3V, it is not enough to drive the break-make of high power device IGBT, therefore need to strengthen the driving force of this pwm signal, by STM32, produce Si road phase-shift PWM signal through high-frequency drive module as shown in Figure 3, produce four tunnel push-pull type pulsed drive, respectively as the driving signal of converter bridge switching parts pipe VT1~VT4, gauge tap pipe break-make.
As shown in Fig. 4 a and Fig. 4 b, be respectively the voltage detecting circuit schematic diagram of electric current and voltage detection module of the present invention and the current detection circuit schematic diagram of electric current and voltage detection module of the present invention.
Voltage sampling signal is after inductance L 5, L6 and capacitor C 47, C48 filtering, adopt non-isolation resistance R47, the sampling of R48 dividing potential drop, through operational amplifier U16B, carry out signal condition afterwards, through precision photoelectric coupler chip U18, voltage follower U17B, isolate, adjust again, become the voltage signal linear with output voltage, the voltage signal that is less than or equal to 3.3V obtaining is input to respectively the ADCIN0 of STM32 Digital Control module, then by corresponding software, realizes voltage A/D and change.Current sampling circuit utilizes Hall current sensor to carry out current signal sampling to the output current of main circuit, Hall current sensor obtains the weak voltage signals linear with output current and obtains afterwards after filtering comparatively clean, level and smooth signal, then respectively current feedback signal is input to the ADCIN1 of STM32 Digital Control module, then by corresponding software, realizes electric current A/D and change.The feedback of voltage and current closed control circuit that above-mentioned link forms, just can realize the control of output pulse current and voltage.
Fig. 5 is fault secure circuit schematic diagram of the present invention.Overvoltage and undervoltage detection circuit are inputted electrical network after Industrial Frequency Transformer step-down by three-phase alternating current; after being rectified into d. c. voltage signal with bridge rectifier, supply with resistor voltage divider circuit; regulate respectively the size of bridge circuit resistance R 39, R26 and R38, R24; just can change electrical network overvoltage and under-voltage threshold values, can play overvoltage and under-voltage protection effect.Excess temperature testing circuit is realized overheat protector by detecting the disconnection of the temperature relay on radiator, obtain CN1 1. 2. cut-off signal is to the inverting input of comparator U6A, U6A as a comparison device carries out voltage ratio.Its in-phase end is given reference voltage, and when the temperature of radiator is during lower than temperature relay threshold temperature, temperature relay is closed, and comparator U6A inverting input is low level, and comparator U6A exports high level; When the temperature of radiator is during higher than temperature relay threshold temperature, temperature relay disconnects, and comparator U6A inverting input is high level, comparator U6A output low level, and this signal can cause that the error protection of STM32 interrupts.Over-current detection circuit detection of primary current signal is given the inverting input of comparator U6B after filtering; U6B as a comparison its in-phase input end of device is given reference current; when the primary current detecting is greater than given reference current; comparator U6B output low level, this signal can cause the error protection interruption of STM32.In figure, be connected with the external interrupt pin GPIOG9 of STM32 after optocoupler U14 with the output of door U13; when with door U13 output output overvoltage, under-voltage, cross gentle over-current detection signal there is under-voltage, overvoltage, while crossing gentle over current fault; with door output low level; output low level after U14 optocoupler; the triggering signal of interrupting as the error protection of STM32 is to the external interrupt pin GPIOG9 of STM32; enter error protection interrupt service subroutine, realize error protection.
Fig. 6 is the structural representation of STM32 Digital Control module of the present invention.STM32 Digital Control module adopts the STM32F103ZET6 chip of ST company, and its basic structure comprises pwm signal output module, human-computer interface module, memory module RAM and FLASH, digital I/O mouth and A/D analog input.The analog signal that A/D samples is into delivered to the A/D ALT-CH alternate channel of STM32 Digital Control module, STM32 Digital Control module realizes A/D by software algorithm and changes, the given parameter of the result that A/D is changed and human-computer interface module is carried out after PI computing, issue control signal of the embedded phase-shift PWM module of STM32, make phase-shift PWM module produce four phase-shift PWM signal ,Si road, tunnel phase-shift PWM signals, after high-frequency drive module isolation amplification, main circuit is carried out to phase shift modulation.Adopted timer cycle interruption and underflow to interrupt herein, after timer cycle interruption triggers, in cycle interruption service routine, the comparison match value of original increasing counting is changed to and subtracts the matching value that counting needs, in underflow down trigger, the original comparison match value that subtracts counting is changed to the comparison match value that next cycle increasing counting needs in underflow interrupt service routine, realize full-bridge phase-shift soft switch and control; Adopt one-period timer periodically to switch output current set-point, realize the pulse output of electric current.
It shown in Fig. 7, is output Pulse Electric flow graph of the present invention.Output pulse current has 2 stages in one-period: peak point current stage Tp; Background current stage Tb.
It shown in Fig. 8, is the program flow diagram of STM32 control system of the present invention.The software of design is mainly the control of reading and exporting pulse current and voltage that realizes A/D transformation result, realizes stage by stage duty ratio modulation, stage pulse switching and the constant current of the adjustable pwm pulse generation of phase shifting angle, driving pulse and controls.The operation principle of control system program is: after system initialization and while starting welding, program enters striking program, it comprises SECO (supply gas, wire feed etc.), wire feed striking at a slow speed, when electric current is greater than certain value, and extend after a period of time, program enters the current impulse cycle stage: in the peak point current stage, when this phases-time then enters the background current stage; In the background current stage, when this phases-time then enters the peak point current stage, so constantly move in circles, realize the control of output pulse current and voltage.When each stage starts, by algorithm, calculate each phases-time, adopt unified timer to carry out timing to each stage, and the constant current of carrying out output current by set-point in each stage is controlled.In pulse cycle process, constantly check welding stop signal, once receive, stop welding instruction, program enters to be received the arc control stage, finally stops welding the new arc welding gun switch signal of circular wait.

Claims (5)

1. the Pulse MIG Welding Power Source system based on STM32, is characterized in that: comprise inverter main circuit and control circuit; Described inverter main circuit comprises input rectifying filtration module, high-frequency inversion module, power voltage changing module and the output rectification filter module of electrical connection successively; The input of input rectifying filtration module is connected with three-phase alternating current input electrical network, the output of output rectification filter module is connected with arc load; Described control circuit comprises STM32 Digital Control module, electric current and voltage detection module, error protection module, human-computer interface module and high-frequency drive module; Electric current and voltage detection module is inputted arc load, is exported STM32 Digital Control module to; error protection module input three-phase alternating current, export STM32 Digital Control module to, STM32 Digital Control module except with the interconnected communication of human-computer interface module also through high-frequency drive module, be connected to high-frequency inversion module.
2. the Pulse MIG Welding Power Source system based on STM32 according to claim 1, it is characterized in that: described STM32 Digital Control module adopts control chip STM32F103ZET6, its feedback voltage current parameters and given voltage and current parameter of human-computer interface module that detects arc load according to electric current and voltage detection module carries out PI computing, issue the embedded phase-shift PWM module control signal of STM32, phase-shift PWM module produces four tunnel phase-shift PWM signals, the switching tube IGBT that amplifies control high-frequency inversion module by high-frequency drive module turns on and off under no-voltage, carry out the control of Pulse MIG Welding Power Source output pulse current and voltage, described human-computer interface module adopts digital pulse coding device to realize the accurately given of welding parameter, and human-computer interface module shows welding parameter in real time.
3. the Pulse MIG Welding Power Source system based on STM32 according to claim 2, is characterized in that: described error protection module comprises interconnective over-voltage detection circuit, undervoltage detection circuit, over-current detection circuit and excess temperature testing circuit, AND circuit and peripheral circuit.
4. the Pulse MIG Welding Power Source system based on STM32 according to claim 3, is characterized in that: it is to strengthen driving force by high-frequency drive module that described PWM drives signal.
5. the inverter main circuit for the Pulse MIG Welding Power Source system based on STM32, it is characterized in that: comprise input rectifying bridge (BR1), first to fourth IGBT switching tube (VT1~VT4), on each switching tube with parasitic diode and parasitic capacitance (C9~C12), first is connected successively respectively with the 4th switching tube (VT2 and VT4) with the 3rd switching tube (VT1 and VT3), second after parallel connection again, separately there are the first electric capacity and the 3rd electric capacity (C1 and C3), the second electric capacity and the 4th electric capacity (C2 and C4) after parallel connection, to connect again respectively, the forward output of input rectifying bridge (BR1) after inductance (L1), be added in anodal and the 3rd electric capacity (C3) of the first electric capacity (C1) one end, oppositely export one end of the second electric capacity (C2) negative pole and the 4th electric capacity (C4) to, output between the first switching tube and the 3rd switching tube (VT1 and VT3) or input are through the 5th electric capacity capacitance (C5) of parallel connection, after the 6th electric capacity capacitance (C6) again through last tremendously high frequency isolating transformer (T1) input of the second inductance resonant inductance (L2), output between second switch pipe and the 4th switching tube (VT2 and VT4) or input to another input of high-frequency isolation transformer (T1), the brachium pontis that the first and the 3rd switching tube (VT1 and VT3) forms is leading-bridge, the brachium pontis that the second and the 4th switching tube (VT2 and VT4) forms is lagging leg, 2 IGBT switching tubes of each brachium pontis become 180 ° of complementary conductings, the angle of flow between two brachium pontis differs a phase place,
Output rectifier and filter: the 5th diode and the 6th diode (V5 and V6), the 7th diode and the 8th diode (V7 and V8) are in parallel respectively, the 5th diode in parallel and the positive pole of the 6th diode (V5 and V6) connect an output of high-frequency isolation transformer (T1), the 7th diode in parallel and the positive pole of the 8th diode (V7 and V8) connect another output of high-frequency isolation transformer (T1), on the 5th diode in parallel and the 6th diode (V5 and V6), be also parallel with the first absorption resistance and the 7th electric capacity (C7), the first absorption resistance is the 5th resistance and the 6th resistance (R5 and R6) in parallel, equally, on the 7th diode in parallel and the 8th diode (V7 and V8), be also parallel with the second absorption resistance and the 8th electric capacity (C8), the second absorption resistance is the 7th resistance and the 8th resistance (R7 and R8) in parallel, the negative pole of the 5th diode to the eight diodes (V5~V8) is that one end of output, the other end of output are the centre tap of high-frequency isolation transformer (T1) after the 3rd inductance (L3).
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CN111730174A (en) * 2020-07-27 2020-10-02 周志霖 DC fast frequency pulse welder
CN112039349A (en) * 2020-09-10 2020-12-04 洛阳博日智能科技有限公司 Intelligent high-frequency high-voltage modular power supply
CN112894095A (en) * 2021-01-11 2021-06-04 华南理工大学 Digital underwater welding power supply capable of outputting multiple external characteristics and working method thereof
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