CN103480946B - Circuit structure of double-voltage welding machine - Google Patents
Circuit structure of double-voltage welding machine Download PDFInfo
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- CN103480946B CN103480946B CN201310437054.XA CN201310437054A CN103480946B CN 103480946 B CN103480946 B CN 103480946B CN 201310437054 A CN201310437054 A CN 201310437054A CN 103480946 B CN103480946 B CN 103480946B
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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
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
- B23K9/1043—Power supply characterised by the electric circuit
- B23K9/105—Power supply characterised by the electric circuit by using discharge tubes or mechanical contactors
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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
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
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Abstract
The invention discloses a circuit structure of a double-voltage welding machine, which comprises a power input end, a power output end, a rectification filter circuit, a sampling circuit, an inverter circuit, a control voltage switching circuit, an optocoupler and a relay, wherein the power input end is connected with the inverter circuit through the rectification filter circuit and the sampling circuit, the inverter circuit is connected with the power output end, the circuit structure also comprises a switching reset circuit, a control module and a driving module, the control voltage switching circuit is connected with the switching reset circuit, the switching reset circuit is connected with the driving module through the control module, and the output end of the driving module is connected with the inverter circuit. The circuit structure of the double-voltage welding machine can realize that no voltage and no current pass through the relay in the voltage switching process of the welding machine, and avoid faults and problems caused by overlarge passing current in the switching process.
Description
Technical field
The present invention relates to welding machine, particularly relate to a kind of circuit structure of twin voltage welding machine.
Background technology
Inverter type welder industry is as a Chaoyang industry, increasing knowledgeable people adds the industry, because the industry internal competition pressure is also increasing, in order to attract more user, strive for certain market share, the variation of product, adaptability have become trend of the times.In product use procedure, a lot of client oneself environment for use uncertain, sometimes need to use in industrial electrical environments, sometimes then only require and to use in electric consumption on lighting, if and at this moment have a welding machine that two kinds of voltage can use, and product cost is less high again, and the stability of product is good again, so will obtain the favor of user.Current twin voltage (220V/380V) welding machine, all use large electrochemical capacitor as the filtering device after rectification, because the performance indications of itself are lower, during the specified use of normal factory calibration just 2000 hours, and during actual use, because electric welding machine power is large, and environment for use is high temperature, the adverse circumstances such as many dirt, be good to making electrochemical capacitor reaching desirable desired value, and use large electrochemical capacitor as filter circuit, because booting moment charging current is very large, and machine have to use soft starting circuit, namely need thermistor and relay with the use of, and in actual use, because the contact of power supply is bad, or spread of voltage easily makes the continuous overcurrent of thermistor and burns out, simultaneously relay due in the start-up course later stage to providing big current, in these processes, the easy arcing of inner contact makes relay fault rate raise.Simultaneously, because these type input powers are two lines, when namely using when 380V, be any two-phase in three-phase electricity, work under non-full-phase state, at this moment need to use very many electrochemical capacitors, therefore need the mechanical dimension strengthening complete machine, and electrochemical capacitor heating itself is many, need strengthen machine intimate space and reach heat radiation object, and after electrochemical capacitor increase, welding machine cost also will increase thereupon.
Summary of the invention
The present invention is directed to the defects such as the cost existed in prior art is high, fault rate is high, fragile, provide a kind of circuit structure of new twin voltage welding machine.
In order to solve the problems of the technologies described above, the present invention is achieved through the following technical solutions:
A circuit structure for twin voltage welding machine, comprises power input, power output end, current rectifying and wave filtering circuit, sample circuit, inverter circuit, control voltage commutation circuit, optocoupler, relay, described power input passes through current rectifying and wave filtering circuit, sample circuit is connected with inverter circuit, and described inverter circuit is connected with power output end, also comprises switch back circuit, control module, driver module, described inverter circuit comprises power tube Q1, power tube Q2, power tube Q3, power tube Q4, transformer T1, described control voltage commutation circuit is connected with switch back circuit, and described switch back circuit is connected with driver module by control module, the output of described driver module respectively with the G pole of power tube Q1, the G pole of power tube Q2, the G pole of power tube Q3, the G pole of power tube Q4 connects, and described optocoupler comprises light-emitting diodes pipe end IC1A, phototriode end IC1B, one end of described light-emitting diodes pipe end IC1A is connected with power supply VCC1 by resistance R19, the other end is connected with sample circuit, the C pole of described phototriode end IC1B is connected with control voltage commutation circuit, the E pole of phototriode end IC1B is connected to ground, described phototriode end IC1B is corresponding with light-emitting diodes pipe end IC1A, and described relay comprises coil-end J1A, switch terminals J1B, normally-closed contact, normally opened contact, one end of described coil-end J1A is connected with power supply VCC, and the other end of described coil-end J1A is connected with control voltage commutation circuit, described switch terminals J1B respectively with power tube Q1, power tube Q2, power tube Q3, power tube Q4 connects, and described normally opened contact is connected with the first winding P1 of transformer, and described normally-closed contact is connected with the second winding P2 of transformer T1.
The alternating current that current rectifying and wave filtering circuit is used for power input inputs becomes stable direct current, inverter circuit is used for stable DC inverter to export to power output end, sample circuit is used for judging the input voltage after current rectifying and wave filtering circuit and selects to activate according to judged result or not active control voltage commutation circuit, control voltage commutation circuit is used for the switch terminals J1B of transfer relay, make its under different input voltages with the corresponding closing of contact, switch back circuit, control module, driver module makes no-voltage and electric current when voltage switching pass through relay, the normally-closed contact of relay is connected with the second winding P2 of transformer T1, corresponding with 380V voltage, the normally opened contact of relay is connected with the first winding P1 of transformer, corresponding with 220V voltage, during as power input employing 220V voltage input, the light-emitting diodes pipe end IC1A of the optocoupler be then connected with sample circuit is not luminous, then phototriode end IC1B not conducting because not receiving light of optocoupler, the coil-end J1A of the relay be then connected with control voltage commutation circuit is energized and makes switch terminals J1B and normally opened contact adhesive, then transformer turns ratio from large to small, thus change output voltage, in voltage switching process, control voltage commutation circuit is by switch back circuit, control module turns off drive waveforms, thus by driver module switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, voltage is made to switch in the process of 220V by 380V, electric current and voltage is not had to pass through relay, after voltage switching, switch back circuit makes control module recover driven waveform, thus the output of inverter circuit power is recovered by driver module, in like manner, as power input switch to the input of 380V voltage time, the light-emitting diodes pipe end IC1A of the optocoupler be connected with sample circuit is luminous, then phototriode end IC1B conducting because receiving light of optocoupler, now no power makes switch terminals J1B contact with normally-closed contact by the coil-end J1A of relay, then transformer turns ratio changes from small to big, thus change output voltage, in voltage switching process, control voltage commutation circuit is by switch back circuit, control module turns off drive waveforms, thus by driver module switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, voltage is made to switch in the process of 380V by 220V, electric current and voltage is not had to pass through relay, after voltage switching, switch back circuit makes control module recover driven waveform, thus the output of inverter circuit power is recovered by driver module.The present invention can realize welding machine no-voltage and electric current in switched voltage process and pass through relay, after switching completes, relay just normally works, avoid in handoff procedure and cause some faults and problem because of excessive by electric current, and the present invention does not use soft starting circuit, therefore avoid burn out because of the continuous overcurrent of thermistor, problem that the easy arcing of inner contact makes relay break down.
As preferably, the circuit structure of a kind of twin voltage welding machine described above, described switch back circuit comprises electric capacity C2, electric capacity C3, comparator IC2, triode Q8, the in-phase input end of described comparator IC2 is by resistance R11, electric capacity C2 is connected with control voltage commutation circuit, the inverting input of described comparator IC2 is by resistance R12, electric capacity C3 is connected with control voltage commutation circuit, described resistance R11 is connected with power supply VCC respectively by resistance R9, connected by resistance R10 and GND, described resistance R12 is connected with power supply VCC1 by resistance R13, the output of described comparator IC2 is connected with the B pole of triode Q8 by diode D12, the E pole of described triode Q8 is connected with power supply VCC by resistance R16, the C pole of described triode Q8 is connected with control module.
When input voltage switches to 380V from 220V, due to the charge-discharge characteristic of electric capacity, electric capacity C3 and electric capacity C2 starts charging, now the level of the inverting input of comparator IC2 is higher than the level of in-phase input end, thus make the output output low level of comparator IC2, thus make triode Q8 conducting, the C pole of triode Q8 is made to export high level to control module, and then by driver module switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, voltage is made to switch in the process of 380V by 220V, electric current and voltage is not had to pass through relay, when electric capacity C3 and electric capacity C2 is full of, voltage switching also completes simultaneously, now the in-phase input end level of comparator IC2 is higher than inverting input level, the output of comparator IC2 is made to export high level, and then make triode Q8 cannot conducting, thus through control module, driver module recovers power tube Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, in like manner, when input voltage switches to 220V from 380V, due to the charge-discharge characteristic of electric capacity, in handoff procedure, electric capacity C2 and electric capacity C3 is discharged over the ground by control voltage commutation circuit, make the in-phase input end level of comparator IC2 lower than inverting input level, thus make the output output low level of comparator IC2, thus make triode Q8 conducting, thus make the C pole of triode Q8 export high level to control module, and then by driver module switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, voltage is made to switch in the process of 220V by 380V, electric current and voltage is not had to pass through relay, when voltage switching is complete, electric capacity C2 also completes electric discharge, now the in-phase input end level of comparator IC2 is higher than inverting input level, the output of comparator IC2 is made to export high level, and then make triode Q8 cannot conducting, thus through control module, driver module recovers power tube Q1, power tube Q2, power tube Q3, the power stage of power tube Q4.
As preferably, the circuit structure of a kind of twin voltage welding machine described above, resistance R14 is in series with between described diode D12 and triode Q8, resistance R15 is in series with between the B pole of described triode Q8 and E pole, resistance R7 is in series with between described electric capacity C2 and control voltage commutation circuit, described resistance R7 two ends are parallel with diode D10, are in series with resistance R8 between described electric capacity C3 and control voltage commutation circuit, and described resistance R8 two ends are parallel with diode D11.More stable when making circuit working.
As preferably, the circuit structure of a kind of twin voltage welding machine described above, described control module comprises power supply IC3, resistance R17, the timing end RT of described power supply IC3 is connected to ground by resistance R17, described switch back circuit is connected with the pass broken ends of fractured bone of power supply IC3, and the output of described power supply IC3 is connected with driver module.The pass broken ends of fractured bone of power supply IC3 is for controlling the drive waveforms of power supply IC3 output, when the pass broken ends of fractured bone input high level of power supply IC3, power supply IC3 will turn off the drive waveforms of output, and then pass through the power stage of driver module switch-off power pipe Q1, power tube Q2, power tube Q3, power tube Q4; When the pass broken ends of fractured bone input low level of power supply IC3, the drive waveforms of the output of power supply IC3 recovers driven waveform, and then recovers the power stage of power tube Q1, power tube Q2, power tube Q3, power tube Q4 by driver module.
As preferably, the circuit structure of a kind of twin voltage welding machine described above, also comprise frequency switching circuit, described frequency switching circuit comprises triode Q5, resistance R3, the B pole of described triode Q5 is connected with control voltage commutation circuit, the E pole ground connection of described triode Q5, the C pole of described triode Q5 is connected with the timing end RT of power supply IC3 by resistance R3.When input voltage is 380V, the triode Q5 be connected with control voltage commutation circuit is by not conducting, and now resistance R3 is equivalent to unsettled, and the timing end RT of power supply IC3 is only relevant with resistance R17; When input voltage switches to 220V, triode Q5 will conducting, now resistance R3 is equivalent to shorted to earth, and resistance R3 is connected with the timing end RT of power supply IC3 with resistance R17 simultaneously, therefore now resistance R3 is equivalent in parallel with resistance R17, thus the timing resistor that the timing end RT changing power supply IC3 connects, thus change the output frequency of power supply IC3, thus improving welding property, increase work efficiency.
As preferably, the circuit structure of a kind of twin voltage welding machine described above, described sample circuit comprises resistance R1, resistance R2, amplifier, diode D13, one end of described resistance R1 is connected with current rectifying and wave filtering circuit by diode D13, the other end of resistance R1 is connected to ground by resistance R2, described resistance R2 two ends are parallel with electric capacity C5, and the A end of described resistance R1 is connected with amplifier, and described amplifier is connected with light-emitting diodes pipe end IC1A.Sample circuit is used for sampling input voltage, when input voltage is 380V, then makes the light-emitting diodes pipe end IC1A be connected with sample circuit luminous, when input voltage is 220V, then makes the light-emitting diodes pipe end IC1A be connected with sample circuit not luminous.
As preferably, the circuit structure of a kind of twin voltage welding machine described above, the two ends of described light-emitting diodes pipe end IC1A are parallel with resistance R18, and the two ends of the integrating circuit that described resistance R1 and electric capacity C5 forms are parallel with electric capacity C4.When electric capacity C4 can prevent civil power from having a very little fluctuation, cause sample circuit misoperation, it can absorb the spike due to power grid environment in very short time, and not misoperation, more stable when making circuit working.
As preferably, the circuit structure of a kind of twin voltage welding machine described above, described amplifier is three end adjustable shunt reference sources or triode or FET or operational amplifier.
As preferably, the circuit structure of a kind of twin voltage welding machine described above, described control voltage commutation circuit comprises triode Q6, triode Q7, the C pole of described triode Q6 is connected with power supply VCC, resistance R20 is in series with between the C pole of described triode Q6 and B pole, the B pole of described triode Q6 is connected with the C pole of phototriode end IC1B, the E pole of described triode Q6 is connected with the B pole of triode Q7, the E pole of described phototriode end IC1B and the E pole of triode Q7 ground connection respectively, the C pole of described triode Q7 is connected with coil-end J1A.Phototriode end IC1B is for receiving the light sent from light-emitting diodes pipe end IC1A, when diode end IC1A is luminous, phototriode end IC1B conducting, make triode Q6 not conducting and then make triode Q7 not conducting, make the coil-end J1A no current of relay pass through and make relay be in normally off; When diode end IC1A is not luminous, phototriode end IC1B not conducting, makes triode Q6 conducting and then makes triode Q7 conducting, make the coil-end J1A of relay have electric current pass through and make relay be in normally open.
As preferably, the circuit structure of a kind of twin voltage welding machine described above, be in series with resistance R5 between the E pole of described triode Q6 and the B pole of triode Q7, be in series with resistance R6 between the B pole of described triode Q7 and E pole, the two ends of described coil-end J1A are parallel with diode D9.More stable when making circuit working.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of power input of the present invention, current rectifying and wave filtering circuit, sample circuit, inverter circuit, power output end part;
Fig. 2 is the electrical block diagram of control voltage commutation circuit of the present invention, switch back circuit, control module, driver module, frequency switching circuit part.
Detailed description of the invention
Below in conjunction with accompanying drawing 1-2 and detailed description of the invention, the present invention is described in further detail, but they are not limitations of the present invention:
embodiment 1
As Fig. 1, shown in Fig. 2, a kind of circuit structure of twin voltage welding machine, comprises power input 1, power output end 6, current rectifying and wave filtering circuit 2, sample circuit 3, inverter circuit 4, control voltage commutation circuit 10, optocoupler, relay, described power input 1 is by current rectifying and wave filtering circuit 2, sample circuit 3 is connected with inverter circuit 4, and described inverter circuit 4 is connected with power output end 6, also comprises switch back circuit 11, control module 12, driver module 13, described inverter circuit 4 comprises power tube Q1, power tube Q2, power tube Q3, power tube Q4, transformer T1, described control voltage commutation circuit 10 is connected with switch back circuit 11, and described switch back circuit 11 is connected with driver module 13 by control module 12, the output of described driver module 13 respectively with the G pole of power tube Q1, the G pole of power tube Q2, the G pole of power tube Q3, the G pole of power tube Q4 connects, and described optocoupler comprises light-emitting diodes pipe end IC1A, phototriode end IC1B, one end of described light-emitting diodes pipe end IC1A is connected with power supply VCC1 by resistance R19, the other end is connected with sample circuit 3, the C pole of described phototriode end IC1B is connected with control voltage commutation circuit 10, the E pole of phototriode end IC1B is connected to ground, described phototriode end IC1B is corresponding with light-emitting diodes pipe end IC1A, and described relay comprises coil-end J1A, switch terminals J1B, normally-closed contact 7, normally opened contact 5, one end of described coil-end J1A is connected with power supply VCC, and the other end of described coil-end J1A is connected with control voltage commutation circuit 10, described switch terminals J1B respectively with power tube Q1, power tube Q2, power tube Q3, power tube Q4 connects, and described normally opened contact 5 is connected with the first winding P1 of transformer, and described normally-closed contact 7 is connected with the second winding P2 of transformer T1.
During work, power input 1 is connected with power supply, electric current is after current rectifying and wave filtering circuit 2 rectifying and wave-filtering, flow through sample circuit 3 and flow into the power tube Q1 of inverter circuit 4, power tube Q2, power tube Q3, in power tube Q4, make 4 power tube work and export inverter voltage, and power output end 6 is outputted to after transformer T1 transformation, when the input voltage of power input 1 becomes 380V from 220V, the light-emitting diodes pipe end IC1A of the optocoupler be connected with sample circuit 3 is by luminescence, then phototriode end IC1B conducting because receiving light of optocoupler, thus drive control voltage commutation circuit 10 makes the coil-end J1A no current of the relay be connected with control voltage commutation circuit 10 pass through, thus switch terminals J1B is connected with normally-closed contact 7, and then change output voltage, in the process that output voltage changes, control voltage commutation circuit 10 also will drive switch back circuit 11, the control module 12 be connected with switch back circuit 11 is made to turn off the drive waveforms of output wave, and then by driver module 13 switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, when realizing voltage switching, no-voltage and circuit pass through relay, after voltage switching completes, switch back circuit 11 makes control module 12 recover normal, thus the power stage of power tube is recovered by driver module 13, in like manner, when the input voltage of power input 1 becomes 220V from 380V, the light-emitting diodes pipe end IC1A of the optocoupler be connected with sample circuit 3 will be not luminous, then phototriode end IC1B not conducting because not receiving light of optocoupler, thus made the coil-end J1A of the relay be connected with control voltage commutation circuit 10 have electric current to pass through by control voltage commutation circuit 10, and then make switch terminals J1B be connected with normally opened contact 5 and change output voltage, in the process that output voltage changes, control voltage commutation circuit 10 also will drive switch back circuit 11, the control module 12 be connected with switch back circuit 11 is made to turn off the drive waveforms of output wave, and then by driver module 13 switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, when realizing voltage switching, no-voltage and circuit pass through relay, after voltage switching completes, switch back circuit 11 makes control module 12 recover normal, thus the power stage of power tube is recovered by driver module 13.
As preferably, described switch back circuit 11 comprises electric capacity C2, electric capacity C3, comparator IC2, triode Q8, the in-phase input end of described comparator IC2 is by resistance R11, electric capacity C2 is connected with control voltage commutation circuit 10, the inverting input of described comparator IC2 is by resistance R12, electric capacity C3 is connected with control voltage commutation circuit 10, described resistance R11 is connected with power supply VCC respectively by resistance R9, connected by resistance R10 and GND, described resistance R12 is connected with power supply VCC1 by resistance R13, the output of described comparator IC2 is connected with the B pole of triode Q8 by diode D12, the E pole of described triode Q8 is connected with power supply VCC by resistance R16, the C pole of described triode Q8 is connected with control module 12.
When voltage becomes 380V from 220V, due to the charge-discharge characteristic of electric capacity, electric capacity C2 and electric capacity C3 will start charging, power supply VCC1 will pass through resistance R12 to inverting input high level of comparator IC2, the length that this high level is held time, determined by the capacity of electric capacity C3, and power supply VCC is via passing through resistance R11 after resistance R9 and resistance R10 dividing potential drop again to the level of the level of the in-phase input end of comparator IC2 by the inverting input lower than comparator IC2, thus make the output output low level of comparator IC2, then now diode D12 by conducting, the B pole of triode Q8 is made to become low level, thus make triode Q8 conducting, the C pole of triode Q8 exports high level to control module 12, thus make control module 12 turn off the drive waveforms of output wave, and then by driver module 13 switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, when making voltage switching, no current and voltage pass through relay, when voltage switching completes, electric capacity C2 and electric capacity C3 also charging complete, now resistance R12 and resistance R13 dividing potential drop recover normal, the inverting input of comparator IC2 is made to reduce to normal level by of short duration high level, thus the voltage of in-phase input end lower than comparator IC2, the output of comparator IC2 is made to export high level, and make the B pole of triode Q8 become high level through diode D12, make triode Q8 cannot conducting and then output low level to control module 12, thus make the drive waveforms of the output wave of control module 12 recover normal, and then recover power tube Q1 by driver module 13, power tube Q2, power tube Q3, the power stage of power tube Q4.
In like manner, when voltage becomes 220V from 380V, due to the charge-discharge characteristic of electric capacity, beginning is discharged by electric capacity C2 and electric capacity C3 over the ground, now the level of the inverting input of comparator IC2 is by the level higher than in-phase input end, the length that this inverting input high level is held time, determined by the capacity of electric capacity C2, now the output output low level of comparator IC2 makes diode D12 conducting, and then make the B pole of triode Q8 become low level, thus make triode Q8 conducting, the C pole of triode Q8 exports high level to control module 12, thus make control module 12 turn off the drive waveforms of output wave, and then by driver module 13 switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, when making voltage switching, no current and voltage pass through relay, when voltage switching completes, electric capacity C2 and electric capacity C3 has also discharged, now resistance R12 and resistance R13 dividing potential drop recover normal, the inverting input of comparator IC2 is made to reduce to normal level by of short duration high level, thus the voltage of in-phase input end lower than comparator IC2, the output of comparator IC2 is made to export high level, and make the B pole of triode Q8 become high level through diode D12, make triode Q8 cannot conducting and then output low level to control module 12, thus make the drive waveforms of the output wave of control module 12 recover normal, and then recover power tube Q1 by driver module 13, power tube Q2, power tube Q3, the power stage of power tube Q4.
As preferably, resistance R14 is in series with between described diode D12 and triode Q8, resistance R15 is in series with between the B pole of described triode Q8 and E pole, resistance R7 is in series with between described electric capacity C2 and control voltage commutation circuit 10, described resistance R7 two ends are parallel with diode D10, be in series with resistance R8 between described electric capacity C3 and control voltage commutation circuit 10, described resistance R8 two ends are parallel with diode D11.
As preferably, described control module 12 comprises power supply IC3, resistance R17, the timing end RT of described power supply IC3 is connected to ground by resistance R17, and described switch back circuit 11 is connected with the pass broken ends of fractured bone of power supply IC3, and the output of described power supply IC3 is connected with driver module 13.During the pass broken ends of fractured bone input low level of power supply IC3, its output exports driven waveform, when the pass broken ends of fractured bone input high level of power supply IC3, its output will turn off the drive waveforms of output wave, thus by the power stage of driver module 13 switch-off power pipe Q1, power tube Q2, power tube Q3, power tube Q4, when making voltage switching, no-voltage and electric current pass through relay.
As preferably, also comprise frequency switching circuit 9, described frequency switching circuit 9 comprises triode Q5, resistance R3, the B pole of described triode Q5 is connected with control voltage commutation circuit 10, the E pole ground connection of described triode Q5, the C pole of described triode Q5 is connected with the timing end RT of power supply IC3 by resistance R3.When input voltage is 380V, the triode Q5 be connected with control voltage commutation circuit 10 is by not conducting, and now resistance R3 is equivalent to unsettled, and the timing end RT of power supply IC3 is only relevant with resistance R17; When input voltage switches to 220V, triode Q5 will conducting, now resistance R3 is equivalent to shorted to earth, and resistance R3 is connected with the timing end RT of power supply IC3 with resistance R17 simultaneously, therefore now resistance R3 is equivalent in parallel with resistance R17, thus the timing resistor that the timing end RT changing power supply IC3 connects, thus change the output frequency of power supply IC3.
As preferably, described sample circuit 3 comprises resistance R1, resistance R2, amplifier 8, diode D13, one end of described resistance R1 is connected with current rectifying and wave filtering circuit 2 by diode D13, the other end of resistance R1 is connected to ground by resistance R2, described resistance R2 two ends are parallel with electric capacity C5, the A end of described resistance R1 is connected with amplifier 8, and described amplifier 8 is connected with light-emitting diodes pipe end IC1A.Resistance R1 and electric capacity C5 forms integrating circuit, control voltage rise time or the time of reduction, voltage after rectifying and wave-filtering passes through resistance R1 and resistance R2 dividing potential drop again by diode D13, when input voltage is 220V, the voltage of resistance R2 upper end and A end does not reach leading of amplifier 8 can voltage, then amplifier 8 ends, then the light-emitting diodes pipe end IC1A being connected optocoupler with amplifier 8 is not luminous; When input voltage is 380V, the voltage of resistance R2 upper end and A end reaches leading of amplifier 8 can voltage, makes amplifier 8 conducting, thus make the light-emitting diodes pipe end IC1A luminescence of the optocoupler is connected with amplifier 8.
As preferably, the two ends of described light-emitting diodes pipe end IC1A are parallel with resistance R18, and the two ends of the integrating circuit that described resistance R1 and electric capacity C5 forms are parallel with electric capacity C4.
As preferably, described amplifier 8 is three end adjustable shunt reference sources or triode or FET or operational amplifier.
As preferably, described control voltage commutation circuit 10 comprises triode Q6, triode Q7, the C pole of described triode Q6 is connected with power supply VCC, resistance R20 is in series with between the C pole of described triode Q6 and B pole, the B pole of described triode Q6 is connected with the C pole of phototriode end IC1B, the E pole of described triode Q6 is connected with the B pole of triode Q7, the E pole of described phototriode end IC1B and the E pole of triode Q7 ground connection respectively, the C pole of described triode Q7 is connected with coil-end J1A.
When input voltage becomes 380V from 220V, the light-emitting diodes pipe end IC1A of optocoupler is by luminescence, make phototriode end IC1B conducting because receiving light, thus make the B pole of the triode Q6 be connected with phototriode end IC1B become low level and not conducting, the B pole of the triode Q7 be then connected with triode Q6 also will become low level and not conducting, thus make the coil-end J1A no current of the relay be connected with the C pole of triode Q7 pass through and switch terminals J1B is connected with normally-closed contact 7 and change output voltage; When input voltage becomes 220V from 380V, the light-emitting diodes pipe end IC1A of optocoupler will be not luminous, make phototriode end IC1B cannot conducting because not receiving light, thus make the B pole of the triode Q6 be connected with phototriode end IC1B become high level and conducting, the B pole of the triode Q7 be then connected with triode Q6 also will become high level and conducting, thus make the coil-end J1A of the relay be connected with the C pole of triode Q7 have electric current to pass through and make switch terminals J1B and normally opened contact 7 adhesive and change output voltage;
As preferably, be in series with resistance R5 between the E pole of described triode Q6 and the B pole of triode Q7, be in series with resistance R6 between the B pole of described triode Q7 and E pole, the two ends of described coil-end J1A are parallel with diode D9.
embodiment 2
As Fig. 1, shown in Fig. 2, a kind of circuit structure of twin voltage welding machine, comprise power input 1, power output end 6, current rectifying and wave filtering circuit 2, sample circuit 3, inverter circuit 4, control voltage commutation circuit 10, optocoupler, relay, described power input 1 is by current rectifying and wave filtering circuit 2, sample circuit 3 is connected with inverter circuit 4, described inverter circuit 4 is connected with power output end 6, also comprise switch back circuit 11, control module 12, driver module 13, frequency switching circuit (9), described optocoupler comprises light-emitting diodes pipe end IC1A, phototriode end IC1B, described relay comprises coil-end J1A, switch terminals J1B, normally-closed contact 7, normally opened contact 5, described inverter circuit 4 comprises power tube Q1, power tube Q2, power tube Q3, power tube Q4, transformer T1, described sample circuit (3) comprises resistance R1, resistance R2, amplifier (8), diode D13, described control voltage commutation circuit (10) comprises triode Q6, triode Q7, described switch back circuit (11) comprises electric capacity C2, electric capacity C3, comparator IC2, triode Q8, described control module (12) comprises power supply IC3, resistance R17, described frequency switching circuit (9) comprises triode Q5, resistance R3, described switch terminals J1B respectively with power tube Q1, power tube Q2, power tube Q3, power tube Q4 connects, described normally opened contact 5 is connected with the first winding P1 of transformer, described normally-closed contact 7 is connected with the second winding P2 of transformer T1, one end of described resistance R1 is connected with current rectifying and wave filtering circuit (2) by diode D13, the other end of resistance R1 is connected to ground by resistance R2, described resistance R2 two ends are parallel with electric capacity C5, the two ends of the integrating circuit that described resistance R1 and electric capacity C5 forms are parallel with electric capacity C4, the A end of described resistance R1 is connected with amplifier (8), one end of described light-emitting diodes pipe end IC1A is connected with power supply VCC1 by resistance R19, the other end of described light-emitting diodes pipe end IC1A is connected with amplifier (8), the C pole of described triode Q6 is connected with power supply VCC, resistance R20 is in series with between the C pole of described triode Q6 and B pole, the B pole of described triode Q6 is connected with the C pole of phototriode end IC1B respectively, be connected with the B pole of triode Q5 by resistance R4, the E pole of described triode Q6 is connected with the B pole of triode Q7 by resistance R5, resistance R6 is in series with between the B pole of described triode Q7 and E pole, the E pole of described phototriode end IC1B and the E pole of triode Q7 ground connection respectively, one end of described coil-end J1A is connected with power supply VCC, the other end of described coil-end J1A is connected with the C pole of triode Q7, the two ends of described coil-end J1A are parallel with diode D9, the E pole ground connection of described triode Q5, the timing end RT of described power supply IC3 is connected to ground respectively by resistance R17, be connected with the C pole of triode Q5 by resistance R3, the C pole of described triode Q7 is also connected with electric capacity C2 respectively by resistance R7, be connected with electric capacity C3 by resistance R8, described resistance R7 two ends are parallel with diode D10, described resistance R8 two ends are parallel with diode D11, the in-phase input end of described comparator IC2 is connected with electric capacity C2 by resistance R11, the inverting input of described comparator IC2 is connected with electric capacity C3 by resistance R12, described resistance R11 is connected with power supply VCC respectively by resistance R9, connected by resistance R10 and GND, described resistance R12 is connected with power supply VCC1 by resistance R13, the output of described comparator IC2 is by diode D12, resistance R14 is connected with the B pole of triode Q8, the E pole of described triode Q8 is connected with power supply VCC by resistance R16, resistance R15 is in series with between the B pole of described triode Q8 and E pole, the C pole of described triode Q8 is connected with the pass broken ends of fractured bone of power supply IC3, the output of described power supply IC3 is connected with the input of driver module 13, the output of described driver module 13 respectively with the G pole of power tube Q1, the G pole of power tube Q2, the G pole of power tube Q3, the G pole of power tube Q4 connects.
Input power cord has three, i.e. X, Y, Z, when three-phase 380V voltage inputs, access three phase mains, when 220V voltage inputs, then select arbitrarily two in three lines, by D1 during three-phase input, D2, D3, D4, D5, D6 forms three-phase bridge rectification circuit, during the input of 220V voltage, single phase bridge type rectifier circu is formed by wherein four diodes, through electric capacity C1 filtering after rectification, electric capacity C1 is thin-film capacitor, there is durability good, the advantages such as caloric value is little, during work, electric current is entering inverter circuit 4 through sample circuit 3 after current rectifying and wave filtering circuit 2 rectifying and wave-filtering, make the power tube Q1 in inverter circuit 4, power tube Q2, power tube Q3, power tube Q4 works and exports inverter current to transformer T1, power output end 6 is exported to after transformer T1 transformation, power output end 6 also includes two rectifying tube D7 and D8, electric current is through rectifying tube D7, export after D8 rectification, when input voltage switches to 380V from 220V, input terminal voltage is through resistance R1, after resistance R2 dividing potential drop, the voltage of A end is still greater than leading energy voltage and making amplifier 8 conducting of amplifier 8, thus make light-emitting diodes pipe end IC1A luminous, then phototriode end IC1B conducting after receiving the light that light-emitting diodes pipe end IC1A sends, the B pole of triode Q6 is made to become low level and end, and then make the B pole of the triode Q7 be connected with the E pole of triode Q6 become low level and end, thus make the coil-end J1A no current of the relay be connected with the C pole of triode Q7 pass through and not work, the switch terminals J1B of relay is made to be switched to normally-closed contact 7 place, thus change the turn ratio of transformer T1 and then change output voltage, simultaneously, moment is switched at the switch terminals J1B of relay, due to the charge-discharge characteristic of electric capacity, the high level of the C pole of triode Q7 will charge to electric capacity C3 through resistance R8 and diode D11, now, electric capacity C3 inputs a high level by through resistance R12 to the inverting input of comparator IC2, the length that this high level is held time, determined by the capacity of electric capacity C3, and now the in-phase input end of comparator IC2 by powering up through resistance R11 again after resistance R9 and resistance R10 dividing potential drop, then now the inverting input level of comparator IC2 can be higher than in-phase input end level, make the output output low level of comparator IC2, now power supply VCC is by resistance R16, the B pole of resistance R15 to triode Q8, when the output output low level of comparator IC2, diode D12 conducting, the B pole of triode Q8 is made to become low level, thus make triode Q8 conducting, the C pole of triode Q8 is made to export high level to the pass broken ends of fractured bone of power supply IC3, then power supply IC3 will turn off the drive waveforms of the output wave of output, thus by driver module 13 switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, no-voltage and electric current in voltage switching process is made to pass through relay, when voltage switching completes, electric capacity C3 also completes charging, then now resistance R12 and resistance R13 dividing potential drop recover normal, the inverting input level of comparator IC2 is made to drop to normal level and lower than the in-phase input end level of comparator IC2, the output of comparator IC2 is made to export high level, and make the B pole of triode Q8 become high level through diode D12 and resistance R14, make triode Q8 cannot conducting and then make the pass broken ends of fractured bone of power supply IC3 become low level, the output wave of the output of power supply IC3 is made to recover driven waveform, and then recover power tube Q1 by driver module 13, power tube Q2, power tube Q3, the power stage of power tube Q4.
In like manner, when input voltage switches to 220V from 380V, input terminal voltage is through resistance R1, after resistance R2 dividing potential drop, the voltage of A end is less than leading of amplifier 8 can voltage and make amplifier 8 cannot conducting, thus make light-emitting diodes pipe end IC1A not luminous, then phototriode end IC1B cannot conducting because not receiving light, then the B pole of triode Q6 will become high level and make triode Q6 conducting, the voltage that then the E pole of triode Q6 exports arrives the B pole of triode Q7 after resistance R5 and resistance R6 dividing potential drop, the B pole of triode Q7 is made to become high level and conducting, then electric current will flow through coil-end J1A and the triode Q7 of relay, now relay adhesive, the switch terminals J1B of relay is made to be switched to normally opened contact 5 place, thus change the turn ratio of transformer T1 and then change output voltage, simultaneously, moment is switched at the switch terminals J1B of relay, due to the charge-discharge characteristic of electric capacity, electric capacity C2 is discharged by triode Q7 more over the ground through diode D10 and resistance R7, and then the level of in-phase input end of comparator IC2 is dragged down through resistance R11, the time dragged down is determined by the capacity of electric capacity C2, the level of the in-phase input end of the comparator IC2 after dragging down is by the level of the inverting input lower than comparator IC2, make the output output low level of comparator IC2, now power supply VCC is by resistance R16, the B pole of resistance R15 to triode Q8, when the output output low level of comparator IC2, diode D12 conducting, the B pole of triode Q8 is made to become low level, thus make triode Q8 conducting, the C pole of triode Q8 is made to export high level to the pass broken ends of fractured bone of power supply IC3, then power supply IC3 will turn off the drive waveforms of the output wave of output, thus by driver module 13 switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, no-voltage and electric current in voltage switching process is made to pass through relay, meanwhile, due to phototriode end IC1B conducting, the B pole of triode Q5 is made to become high level thus make Q5 conducting, now resistance R3 is equivalent to shorted to earth, resistance R3 and resistance R17 becomes parallel relationship, thus change the size of the timing resistor be connected with the timing end RT of power supply IC3, thus change the output frequency of power supply IC3, after exporting through inverter circuit 4 inversion, improving welding property, increase work efficiency, when voltage switching completes, electric capacity C2 also completes electric discharge, then now resistance R9 and resistance R10 dividing potential drop recover normal, the in-phase input end level of comparator IC2 is made to revert to normal level and higher than the inverting input level of comparator IC2, the output of comparator IC2 is made to export high level, and make the B pole of triode Q8 become high level through diode D12 and resistance R14, make triode Q8 cannot conducting and then make the pass broken ends of fractured bone of power supply IC3 become low level, the output wave of the output of power supply IC3 is made to recover driven waveform, and then recover power tube Q1 by driver module 13, power tube Q2, power tube Q3, the power stage of power tube Q4.
In a word, the foregoing is only preferred embodiment of the present invention, all equalizations done according to the scope of the present patent application patent change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. a circuit structure for twin voltage welding machine, comprises power input (1), power output end (6), current rectifying and wave filtering circuit (2), sample circuit (3), inverter circuit (4), control voltage commutation circuit (10), optocoupler, relay, described power input (1) is by current rectifying and wave filtering circuit (2), sample circuit (3) is connected with inverter circuit (4), and described inverter circuit (4) is connected with power output end (6), it is characterized in that: also comprise switch back circuit (11), control module (12), driver module (13), described inverter circuit (4) comprises power tube Q1, power tube Q2, power tube Q3, power tube Q4, transformer T1, described control voltage commutation circuit (10) is connected with switch back circuit (11), described switch back circuit (11) is connected with driver module (13) by control module (12), the output of described driver module (13) respectively with the G pole of power tube Q1, the G pole of power tube Q2, the G pole of power tube Q3, the G pole of power tube Q4 connects, and described optocoupler comprises light-emitting diodes pipe end IC1A, phototriode end IC1B, one end of described light-emitting diodes pipe end IC1A is connected with power supply VCC1 by resistance R19, the other end is connected with sample circuit (3), the C pole of described phototriode end IC1B is connected with control voltage commutation circuit (10), the E pole of phototriode end IC1B is connected to ground, described phototriode end IC1B is corresponding with light-emitting diodes pipe end IC1A, and described relay comprises coil-end J1A, switch terminals J1B, normally-closed contact (7), normally opened contact (5), one end of described coil-end J1A is connected with power supply VCC, and the other end of described coil-end J1A is connected with control voltage commutation circuit (10), described switch terminals J1B respectively with power tube Q1, power tube Q2, power tube Q3, power tube Q4 connects, and described normally opened contact (5) is connected with the first winding P1 of transformer, and described normally-closed contact (7) is connected with the second winding P2 of transformer T1.
2. the circuit structure of a kind of twin voltage welding machine according to claim 1, it is characterized in that: described switch back circuit (11) comprises electric capacity C2, electric capacity C3, comparator IC2, triode Q8, the in-phase input end of described comparator IC2 is by resistance R11, electric capacity C2 is connected with control voltage commutation circuit (10), the inverting input of described comparator IC2 is by resistance R12, electric capacity C3 is connected with control voltage commutation circuit (10), described resistance R11 is connected with power supply VCC respectively by resistance R9, connected by resistance R10 and GND, described resistance R12 is connected with power supply VCC1 by resistance R13, the output of described comparator IC2 is connected with the B pole of triode Q8 by diode D12, the E pole of described triode Q8 is connected with power supply VCC by resistance R16, the C pole of described triode Q8 is connected with control module (12).
3. the circuit structure of a kind of twin voltage welding machine according to claim 2, it is characterized in that: between described diode D12 and triode Q8, be in series with resistance R14, resistance R15 is in series with between the B pole of described triode Q8 and E pole, resistance R7 is in series with between described electric capacity C2 and control voltage commutation circuit (10), described resistance R7 two ends are parallel with diode D10, be in series with resistance R8 between described electric capacity C3 and control voltage commutation circuit (10), described resistance R8 two ends are parallel with diode D11.
4. the circuit structure of a kind of twin voltage welding machine according to claim 1, it is characterized in that: described control module (12) comprises power supply IC3, resistance R17, the timing end RT of described power supply IC3 is connected to ground by resistance R17, described switch back circuit (11) is connected with the pass broken ends of fractured bone of power supply IC3, and the output of described power supply IC3 is connected with driver module (13).
5. the circuit structure of a kind of twin voltage welding machine according to claim 4, it is characterized in that: also comprise frequency switching circuit (9), described frequency switching circuit (9) comprises triode Q5, resistance R3, the B pole of described triode Q5 is connected with control voltage commutation circuit (10), the E pole ground connection of described triode Q5, the C pole of described triode Q5 is connected with the timing end RT of power supply IC3 by resistance R3.
6. the circuit structure of a kind of twin voltage welding machine according to claim 1, it is characterized in that: described sample circuit (3) comprises resistance R1, resistance R2, amplifier (8), diode D13, one end of described resistance R1 is connected with current rectifying and wave filtering circuit (2) by diode D13, the other end of resistance R1 is connected to ground by resistance R2, described resistance R2 two ends are parallel with electric capacity C5, the A end of described resistance R1 is connected with amplifier (8), and described amplifier (8) is connected with light-emitting diodes pipe end IC1A.
7. the circuit structure of a kind of twin voltage welding machine according to claim 6, is characterized in that: the two ends of described light-emitting diodes pipe end IC1A are parallel with resistance R18, and the two ends of the integrating circuit that described resistance R1 and electric capacity C5 forms are parallel with electric capacity C4.
8. the circuit structure of a kind of twin voltage welding machine according to claim 6, is characterized in that: described amplifier (8) is three end adjustable shunt reference sources or triode or FET or operational amplifier.
9. the circuit structure of a kind of twin voltage welding machine according to claim 1, it is characterized in that: described control voltage commutation circuit (10) comprises triode Q6, triode Q7, the C pole of described triode Q6 is connected with power supply VCC, resistance R20 is in series with between the C pole of described triode Q6 and B pole, the B pole of described triode Q6 is connected with the C pole of phototriode end IC1B, the E pole of described triode Q6 is connected with the B pole of triode Q7, the E pole of described phototriode end IC1B and the E pole of triode Q7 ground connection respectively, the C pole of described triode Q7 is connected with coil-end J1A.
10. the circuit structure of a kind of twin voltage welding machine according to claim 9, it is characterized in that: between the E pole of described triode Q6 and the B pole of triode Q7, be in series with resistance R5, be in series with resistance R6 between the B pole of described triode Q7 and E pole, the two ends of described coil-end J1A are parallel with diode D9.
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| CN114226920B (en) * | 2022-01-07 | 2022-08-23 | 温岭阿凡达机电有限公司 | Global general welding machine circuit selection method and system |
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Effective date of registration: 20220523 Address after: 321300 unit 1, building 2, No. 528, Jiuding Road, Yongkang Economic Development Zone, Jinhua City, Zhejiang Province (self declaration) Patentee after: Zhejiang jundi Electronic Technology Co.,Ltd. Address before: Zone 208, No. 189, Zizheng Road, Yongkang Economic Development Zone, Jinhua, Zhejiang 321300 Patentee before: YONGKANG TIGTOP TECHNOLOGY CO.,LTD. |