CN203471120U - Circuit structure of double-voltage welder - Google Patents
Circuit structure of double-voltage welder Download PDFInfo
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- CN203471120U CN203471120U CN201320589585.6U CN201320589585U CN203471120U CN 203471120 U CN203471120 U CN 203471120U CN 201320589585 U CN201320589585 U CN 201320589585U CN 203471120 U CN203471120 U CN 203471120U
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Abstract
The utility model discloses a circuit structure of a double-voltage welder. The circuit structure of the double-voltage welder comprises a power source input end, a power source output end, a rectifier filter circuit, a sampling circuit, an inverter circuit, a control voltage switching circuit, an optocoupler and a relay, wherein the power source input end is connected with the inverter circuit through the rectifier filter circuit and the sampling circuit; the inverter circuit is connected with the power source output end. The circuit structure of the double-voltage welder further comprises a switching reset circuit, a control module and a drive module, wherein the control voltage switching circuit is connected with the switching reset circuit; the switching reset circuit is connected with the drive module through the control module; the output end of the drive module is connected with the inverter circuit. By means of the circuit structure of the double-voltage welder, no voltage or current passes through the relay in the voltage switching process of the welder, and some faults and problems caused by overlarge passing currents in the switching process are avoided.
Description
Technical field
The utility model relates to welding machine, relates in particular to the circuit structure of a kind of pair of voltage welding machine.
Background technology
Inverter type welder industry is as a Chaoyang industry, increasing knowledgeable people has added the industry, because of the industry internal competition pressure also increasing, in order to attract more user, strive for certain market share, variation, the adaptability of product have become trend of the times.In product use procedure, uncertain oneself the environment for use of a lot of clients, sometimes need in commercial power environment, use, sometimes only require in electric consumption on lighting and use, if and at this moment have two kinds of welding machines that voltage can be used, and product cost is less high again, and the stability of product is good again, will obtain so user's favor.At present two voltage (220V/380V) welding machines, filtering device after all using large electrochemical capacitor as rectification, because the performance indications of itself are lower, while normally dispatching from the factory the specified use of standard, ability is 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, to being good at, electrochemical capacitor reaches desirable desired value, and use large electrochemical capacitor as filter circuit, because booting moment charging current is very large, and machine has to use soft starting circuit, need thermistor and relay to be used in conjunction with, 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, relay is owing to giving large electric current is provided in the start-up course later stage simultaneously, in these processes, the easy arcing of inner contact raises relay fault rate.Simultaneously, because these type input powers are two lines, while using when 380V, be any two-phase in three-phase electricity, under non-full-phase state, work, at this moment need to use very many electrochemical capacitors, therefore need to strengthen the mechanical dimension of complete machine, and electrochemical capacitor heating itself is many, need strengthen machine intimate space and reach heat radiation object, and after electrochemical capacitor increases, welding machine cost also will increase thereupon.
Summary of the invention
The defects such as the utility model is high for the cost existing in prior art, fault rate is high, fragile, provide a kind of circuit structure of new two voltage welding machines.
In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions:
A circuit structure for pair 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, described switch back circuit is connected with driver module by control module, the output of described driver module respectively with the G utmost point of power tube Q1, the G utmost point of power tube Q2, the G utmost point of power tube Q3, the G utmost point 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 R 19, the other end is connected with sample circuit, the C utmost point of described phototriode end IC1B is connected with control voltage commutation circuit, the E utmost point of phototriode end IC1B is connected with ground, described phototriode end IC1B is corresponding with light-emitting diodes pipe end IC1A, and described relay pack is drawn together 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, the other end of described coil-end J1A with control voltage commutation circuit and be connected, 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.
Current rectifying and wave filtering circuit is for becoming direct current stably by the alternating current of power input input, inverter circuit is used for DC inverter stably and exports to power output end, sample circuit is for judging the input voltage after current rectifying and wave filtering circuit and select activating or active control voltage commutation circuit not according to judged result, control voltage commutation circuit 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 switches 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, while adopting the input of 220V voltage as power input, the light-emitting diodes pipe end IC1A of the optocoupler being connected with sample circuit is not luminous, the phototriode end IC1B of optocoupler is not because receiving not conducting of light, the coil-end J1A of the relay being connected with control voltage commutation circuit switches on and makes switch terminals J1B and normally opened contact adhesive, the transformer turn ratio from large to small, thereby change output voltage, in voltage handoff procedure, control voltage commutation circuit by switch back circuit, control module is turn-offed drive waveforms, thereby by driver module switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, make in process that voltage switches to 220V by 380V, do not have electric current and voltage to pass through relay, after voltage switches, switch back circuit makes control module recover driven waveform, thereby by driver module, recover the output of inverter circuit power, in like manner, while switching to the input of 380V voltage as power input, the light-emitting diodes pipe end IC1A of the optocoupler being connected with sample circuit is luminous, the phototriode end IC1B of optocoupler is because receiving light conducting, now the coil-end J1A of relay makes switch terminals J1B contact with normally-closed contact no power, the transformer turn ratio is changed from small to big, thereby change output voltage, in voltage handoff procedure, control voltage commutation circuit by switch back circuit, control module is turn-offed drive waveforms, thereby by driver module switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, make in process that voltage switches to 380V by 220V, do not have electric current and voltage to pass through relay, after voltage switches, switch back circuit makes control module recover driven waveform, thereby by driver module, recover the output of inverter circuit power.The utility model can be realized welding machine no-voltage and electric current in switched voltage process and pass through relay, after switching completes, relay just works, avoided in handoff procedure because of by excessive some faults and the problem of causing of electric current, and the utility model is not used soft starting circuit, therefore avoided because of the problem that the continuous overcurrent of thermistor burns out, the easy arcing of inner contact is broken down relay.
As preferably, the circuit structure of a kind of pair of voltage welding machine described above, described switch back circuit comprises capacitor C 2, capacitor C 3, comparator IC2, triode Q8, the in-phase input end of described comparator IC2 is by resistance R 11, capacitor C 2 is connected with control voltage commutation circuit, the inverting input of described comparator IC2 is by resistance R 12, capacitor C 3 is connected with control voltage commutation circuit, described resistance R 11 is connected with power supply VCC by resistance R 9 respectively, by resistance R 10, be connected with GND, described resistance R 12 is connected with power supply VCC1 by resistance R 13, the output of described comparator IC2 is connected with the B utmost point of triode Q8 by diode D12, the E utmost point of described triode Q8 is connected with power supply VCC by resistance R 16, the C utmost point of described triode Q8 is connected with control module.
When input voltage switches to 380V from 220V, charge-discharge characteristic due to electric capacity, capacitor C 3 and capacitor C 2 start charging, now the level of the inverting input of comparator IC2 is higher than the level of in-phase input end, thereby make the output output low level of comparator IC2, thereby make triode Q8 conducting, make the C utmost point output high level of triode Q8 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, make in process that voltage switches to 380V by 220V, do not have electric current and voltage to pass through relay, when capacitor C 3 and capacitor C 2 are full of, voltage switching also completes simultaneously, now the in-phase input end level of comparator IC2 is higher than inverting input level, make the output output high level of comparator IC2, and then make the triode Q8 cannot conducting, thereby 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, charge-discharge characteristic due to electric capacity, in handoff procedure, capacitor C 2 and capacitor C 3 are discharged over the ground by controlling voltage commutation circuit, make the in-phase input end level of comparator IC2 lower than inverting input level, thereby make the output output low level of comparator IC2, thereby make triode Q8 conducting, thereby make the C utmost point output high level of triode Q8 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, make in process that voltage switches to 220V by 380V, do not have electric current and voltage to pass through relay, at voltage, switch when complete, capacitor C 2 also completes electric discharge, now the in-phase input end level of comparator IC2 is higher than inverting input level, make the output output high level of comparator IC2, and then make the triode Q8 cannot conducting, thereby 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 pair of voltage welding machine described above, between described diode D12 and triode Q8, be in series with resistance R 14, between the B utmost point of described triode Q8 and the E utmost point, be in series with resistance R 15, between described capacitor C 2 and control voltage commutation circuit, be in series with resistance R 7, described resistance R 7 two ends are parallel with diode D10, between described capacitor C 3 and control voltage commutation circuit, are in series with resistance R 8, and described resistance R 8 two ends are parallel with diode D11.More stable while making circuit working.
As preferably, the circuit structure of a kind of pair of voltage welding machine described above, described control module comprises power supply IC3, resistance R 17, the timing end RT of described power supply IC3 is connected with ground by resistance R 17, 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 broken ends of fractured bone input high level of the pass of power supply IC3, power supply IC3 will turn-off the drive waveforms of output, and then by the power stage of driver module switch-off power pipe Q1, power tube Q2, power tube Q3, power tube Q4; When the broken ends of fractured bone input low level of the pass of power supply IC3, the drive waveforms of the output of power supply IC3 is recovered driven waveform, and then by driver module, recovers the power stage of power tube Q1, power tube Q2, power tube Q3, power tube Q4.
As preferably, the circuit structure of a kind of pair of voltage welding machine described above, also comprise frequency switching circuit, described frequency switching circuit comprises triode Q5, resistance R 3, the B utmost point of described triode Q5 is connected with control voltage commutation circuit, the E utmost point ground connection of described triode Q5, the C utmost point of described triode Q5 is connected with the timing end RT of power supply IC3 by resistance R 3.When input voltage is 380V, and control triode Q5 that voltage commutation circuit is connected by not conducting, now resistance R 3 is equivalent to unsettledly, and the timing end RT of power supply IC3 is only relevant with resistance R 17; When input voltage switches to 220V, triode Q5 will conducting, now resistance R 3 is equivalent to shorted to earth, and resistance R 3 is connected with the timing end RT of power supply IC3 with resistance R 17 simultaneously, therefore now resistance R 3 and resistance R 17 be equivalent in parallel, thereby changed the timing resistor of the timing end RT connection of power supply IC3, thereby changed the output frequency of power supply IC3, thereby improve welding performance, increase work efficiency.
As preferably, the circuit structure of a kind of pair of voltage welding machine described above, described sample circuit comprises resistance R 1, resistance R 2, amplifier, diode D13, one end of described resistance R 1 is connected with current rectifying and wave filtering circuit by diode D13, the other end of resistance R 1 is connected with ground by resistance R 2, described resistance R 2 two ends are parallel with capacitor C 5, and the A end of described resistance R 1 is connected with amplifier, and described amplifier is connected with light-emitting diodes pipe end IC1A.Sample circuit, for input voltage is sampled, when input voltage is 380V, makes the light-emitting diodes pipe end IC1A being connected with sample circuit luminous, when input voltage is 220V, makes the light-emitting diodes pipe end IC1A being connected with sample circuit not luminous.
As preferably, the circuit structure of a kind of pair of voltage welding machine described above, the two ends of described light-emitting diodes pipe end IC1A are parallel with resistance R 18, and described resistance R 1 is parallel with capacitor C 4 with the two ends of the integrating circuit that capacitor C 5 forms.When capacitor C 4 can prevent that civil power from having very little fluctuation, cause sample circuit misoperation, it can absorb the interior spike due to power grid environment of very short time, and not misoperation is more stable while making circuit working.
As preferably, the circuit structure of a kind of pair of voltage welding machine described above, described amplifier is three end adjustable shunt reference sources or triode or FET exclusive disjunction amplifier.
As preferably, the circuit structure of a kind of pair of voltage welding machine described above, described control voltage commutation circuit comprises triode Q6, triode Q7, the C utmost point of described triode Q6 is connected with power supply VCC, between the C utmost point of described triode Q6 and the B utmost point, be in series with resistance R 20, the B utmost point of described triode Q6 is connected with the C utmost point of phototriode end IC1B, the E utmost point of described triode Q6 is connected with the B utmost point of triode Q7, the described E utmost point of phototriode end IC1B and the E utmost point of triode Q7 be ground connection respectively, and the C utmost point of described triode Q7 is connected with coil-end J1A.Phototriode end IC1B is for receiving the light sending from light-emitting diodes pipe end IC1A, when diode end IC1A is luminous, phototriode end IC1B conducting, make triode not conducting of Q6 and then make not conducting of triode Q7, make the coil-end J1A no current of relay by making relay in normally off; When diode end IC1A is not luminous, not conducting of phototriode end IC1B, makes triode Q6 conducting and then makes triode Q7 conducting, makes the coil-end J1A of relay have electric current by making relay in normally open.
As preferably, the circuit structure of a kind of pair of voltage welding machine described above, between the E utmost point of described triode Q6 and the B utmost point of triode Q7, be in series with resistance R 5, between the B utmost point of described triode Q7 and the E utmost point, be in series with resistance R 6, the two ends of described coil-end J1A are parallel with diode D9.More stable while making circuit working.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the utility model power input, current rectifying and wave filtering circuit, sample circuit, inverter circuit, power output end part;
Fig. 2 is the electrical block diagram that the utility model is controlled voltage commutation circuit, switch back circuit, control module, driver module, frequency switching circuit part.
The specific embodiment
Below in conjunction with accompanying drawing 1-2 and the specific embodiment, the utility model is described in further detail, but they are not to restriction of the present utility model:
As Fig. 1, shown in Fig. 2, the circuit structure of a kind of pair of 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, 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 utmost point of power tube Q1, the G utmost point of power tube Q2, the G utmost point of power tube Q3, the G utmost point 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 R 19, the other end is connected with sample circuit 3, the C utmost point of described phototriode end IC1B is connected with control voltage commutation circuit 10, the E utmost point of phototriode end IC1B is connected with ground, described phototriode end IC1B is corresponding with light-emitting diodes pipe end IC1A, and described relay pack is drawn together 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, the other end of described coil-end J1A with control voltage commutation circuit 10 and be connected, 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-filterings, flow through sample circuit 3 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 output to power output end 6 after transformer T1 transformation, when the input voltage of power input 1 is when 220V becomes 380V, the light-emitting diodes pipe end IC1A of the optocoupler being connected with sample circuit 3 is by luminous, the phototriode end IC1B of optocoupler is because receiving light conducting, thereby drive control voltage commutation circuit 10 makes to pass through with the coil-end J1A no current of controlling the relay that voltage commutation circuit 10 is connected, thereby switch terminals J1B is connected with normally-closed contact 7, and then change output voltage, in the process changing at output voltage, control voltage commutation circuit 10 and also will drive switch back circuit 11, the drive waveforms that the control module 12 that makes to be connected with switch back circuit 11 is turn-offed output waves, and then by driver module 13 switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, while realizing voltage switching, no-voltage and circuit pass through relay, after voltage has switched, switch back circuit 11 makes control module 12 recover normal, thereby by driver module 13, recover the power stage of power tube, in like manner, when the input voltage of power input 1 is when 380V becomes 220V, the light-emitting diodes pipe end IC1A of the optocoupler being connected with sample circuit 3 will be not luminous, the phototriode end IC1B of optocoupler is not because receiving not conducting of light, thereby make have electric current to pass through with the coil-end J1A that controls the relay that voltage commutation circuit 10 is connected by controlling voltage commutation circuit 10, and then switch terminals J1B is connected with normally opened contact 5 and changes output voltage, in the process changing at output voltage, control voltage commutation circuit 10 and also will drive switch back circuit 11, the drive waveforms that the control module 12 that makes to be connected with switch back circuit 11 is turn-offed output waves, and then by driver module 13 switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, while realizing voltage switching, no-voltage and circuit pass through relay, after voltage has switched, switch back circuit 11 makes control module 12 recover normal, thereby by driver module 13, recover the power stage of power tube.
As preferably, described switch back circuit 11 comprises capacitor C 2, capacitor C 3, comparator IC2, triode Q8, the in-phase input end of described comparator IC2 is by resistance R 11, capacitor C 2 is connected with control voltage commutation circuit 10, the inverting input of described comparator IC2 is by resistance R 12, capacitor C 3 is connected with control voltage commutation circuit 10, described resistance R 11 is connected with power supply VCC by resistance R 9 respectively, by resistance R 10, be connected with GND, described resistance R 12 is connected with power supply VCC1 by resistance R 13, the output of described comparator IC2 is connected with the B utmost point of triode Q8 by diode D12, the E utmost point of described triode Q8 is connected with power supply VCC by resistance R 16, the C utmost point of described triode Q8 is connected with control module 12.
When voltage becomes 380V from 220V, charge-discharge characteristic due to electric capacity, capacitor C 2 and capacitor C 3 will start charging, power supply VCC1 will give high level of inverting input of comparator IC2 by resistance R 12, the length that this high level is held time, capacity by capacitor C 3 determines, and power supply VCC gives the level of in-phase input ends of comparator IC2 by the level of the inverting input lower than comparator IC2 by resistance R 11 after via resistance R 9 and resistance R 10 dividing potential drops again, thereby make the output output low level of comparator IC2, now diode D12 by conducting, make the B utmost point of triode Q8 become low level, thereby make triode Q8 conducting, the C utmost point output high level of triode Q8 is to control module 12, thereby the drive waveforms that makes control module 12 turn-off 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 voltage is switched, no current and voltage pass through relay, when voltage has switched, capacitor C 2 and capacitor C 3 have also been charged, now resistance R 12 and resistance R 13 dividing potential drops recover normal, make the inverting input of comparator IC2 reduce to normal level by of short duration high level, thereby the voltage lower than the in-phase input end of comparator IC2, make the output output high level of comparator IC2, and make the B utmost point of triode Q8 become high level through diode D12, make triode Q8 cannot conducting so that output low level to control module 12, thereby the drive waveforms that makes the output wave of control module 12 recovers 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, charge-discharge characteristic due to electric capacity, capacitor C 2 and capacitor C 3 will start electric discharge 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, capacity by capacitor C 2 determines, now the output output low level of comparator IC2 makes diode D12 conducting, and then make the B utmost point of triode Q8 become low level, thereby make triode Q8 conducting, the C utmost point output high level of triode Q8 is to control module 12, thereby the drive waveforms that makes control module 12 turn-off 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 voltage is switched, no current and voltage pass through relay, when voltage has switched, capacitor C 2 and capacitor C 3 have also been discharged, now resistance R 12 and resistance R 13 dividing potential drops recover normal, make the inverting input of comparator IC2 reduce to normal level by of short duration high level, thereby the voltage lower than the in-phase input end of comparator IC2, make the output output high level of comparator IC2, and make the B utmost point of triode Q8 become high level through diode D12, make triode Q8 cannot conducting so that output low level to control module 12, thereby the drive waveforms that makes the output wave of control module 12 recovers 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, between described diode D12 and triode Q8, be in series with resistance R 14, between the B utmost point of described triode Q8 and the E utmost point, be in series with resistance R 15, between described capacitor C 2 and control voltage commutation circuit 10, be in series with resistance R 7, described resistance R 7 two ends are parallel with diode D10, between described capacitor C 3 and control voltage commutation circuit 10, be in series with resistance R 8, described resistance R 8 two ends are parallel with diode D11.
As preferably, described control module 12 comprises power supply IC3, resistance R 17, the timing end RT of described power supply IC3 is connected with ground by resistance R 17, 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 output driven waveform, when the broken ends of fractured bone input high level of the pass of power supply IC3, its output will turn-off the drive waveforms of output wave, thereby by the power stage of driver module 13 switch-off power pipe Q1, power tube Q2, power tube Q3, power tube Q4, when voltage is switched, 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 R 3, the B utmost point of described triode Q5 is connected with control voltage commutation circuit 10, the E utmost point ground connection of described triode Q5, the C utmost point of described triode Q5 is connected with the timing end RT of power supply IC3 by resistance R 3.When input voltage is 380V, and control triode Q5 that voltage commutation circuit 10 is connected by not conducting, now resistance R 3 is equivalent to unsettledly, and the timing end RT of power supply IC3 is only relevant with resistance R 17; When input voltage switches to 220V, triode Q5 will conducting, now resistance R 3 is equivalent to shorted to earth, and resistance R 3 is connected with the timing end RT of power supply IC3 with resistance R 17 simultaneously, therefore now resistance R 3 is equivalent in parallel with resistance R 17, thereby changed the timing resistor of the timing end RT connection of power supply IC3, thereby changed the output frequency of power supply IC3.
As preferably, described sample circuit 3 comprises resistance R 1, resistance R 2, amplifier 8, diode D13, one end of described resistance R 1 is connected with current rectifying and wave filtering circuit 2 by diode D13, the other end of resistance R 1 is connected with ground by resistance R 2, described resistance R 2 two ends are parallel with capacitor C 5, the A end of described resistance R 1 is connected with amplifier 8, and described amplifier 8 is connected with light-emitting diodes pipe end IC1A.Resistance R 1 forms integrating circuit with capacitor C 5, controlling voltage raises time or reduction time, voltage after rectifying and wave-filtering passes through resistance R 1 and resistance R 2 dividing potential drops again by diode D13, when input voltage is 220V, resistance R 2 upper ends be the voltage of A end do not reach leading of amplifier 8 can voltage, amplifier 8 cut-offs, the light-emitting diodes pipe end IC1A that is connected optocoupler with amplifier 8 is not luminous; When input voltage is 380V, resistance R 2 upper ends be the voltage of A end reach leading of amplifier 8 can voltage, make amplifier 8 conductings, thereby make the light-emitting diodes pipe end IC1A of the optocoupler that is connected with amplifier 8 luminous.
As preferably, the two ends of described light-emitting diodes pipe end IC1A are parallel with resistance R 18, and described resistance R 1 is parallel with capacitor C 4 with the two ends of the integrating circuit that capacitor C 5 forms.
As preferably, described amplifier 8 is three end adjustable shunt reference sources or triode or FET exclusive disjunction amplifier.
As preferably, described control voltage commutation circuit 10 comprises triode Q6, triode Q7, the C utmost point of described triode Q6 is connected with power supply VCC, between the C utmost point of described triode Q6 and the B utmost point, be in series with resistance R 20, the B utmost point of described triode Q6 is connected with the C utmost point of phototriode end IC1B, the E utmost point of described triode Q6 is connected with the B utmost point of triode Q7, the described E utmost point of phototriode end IC1B and the E utmost point of triode Q7 be ground connection respectively, and the C utmost point 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 luminous, make phototriode end IC1B because receiving light conducting, thereby make the B utmost point of the triode Q6 that is connected with phototriode end IC1B become low level and not conducting, the B utmost point of the triode Q7 being connected with triode Q6 also will become low level and not conducting, thereby make the coil-end J1A no current of the relay that is connected with the C utmost point of triode Q7 change output voltage by switch terminals J1B is connected with normally-closed contact 7; When input voltage becomes 220V from 380V, the light-emitting diodes pipe end IC1A of optocoupler will be not luminous, make the phototriode end IC1B cannot conducting because not receiving light, thereby make the B utmost point of the triode Q6 that is connected with phototriode end IC1B become high level and conducting, the B utmost point of the triode Q7 being connected with triode Q6 also will become high level and conducting, thereby make the coil-end J1A of the relay that is connected with the C utmost point of triode Q7 have electric current by making switch terminals J1B and normally opened contact 7 adhesives change output voltage;
As preferably, between the E utmost point of described triode Q6 and the B utmost point of triode Q7, be in series with resistance R 5, between the B utmost point of described triode Q7 and the E utmost point, be in series with resistance R 6, the two ends of described coil-end J1A are parallel with diode D9.
As Fig. 1, shown in Fig. 2, the circuit structure of a kind of pair of 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 pack is drawn together 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 R 1, resistance R 2, amplifier (8), diode D13, described control voltage commutation circuit (10) comprises triode Q6, triode Q7, described switch back circuit (11) comprises capacitor C 2, capacitor C 3, comparator IC2, triode Q8, described control module (12) comprises power supply IC3, resistance R 17, described frequency switching circuit (9) comprises triode Q5, resistance R 3, 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 R 1 is connected with current rectifying and wave filtering circuit (2) by diode D13, the other end of resistance R 1 is connected with ground by resistance R 2, described resistance R 2 two ends are parallel with capacitor C 5, described resistance R 1 is parallel with capacitor C 4 with the two ends of the integrating circuit that capacitor C 5 forms, the A end of described resistance R 1 is connected with amplifier (8), one end of described light-emitting diodes pipe end IC1A is connected with power supply VCC1 by resistance R 19, the other end of described light-emitting diodes pipe end IC1A is connected with amplifier (8), the C utmost point of described triode Q6 is connected with power supply VCC, between the C utmost point of described triode Q6 and the B utmost point, be in series with resistance R 20, the B utmost point of described triode Q6 is connected with the C utmost point of phototriode end IC1B respectively, by resistance R 4, be connected with the B utmost point of triode Q5, the E utmost point of described triode Q6 is connected with the B utmost point of triode Q7 by resistance R 5, between the B utmost point of described triode Q7 and the E utmost point, be in series with resistance R 6, the described E utmost point of phototriode end IC1B and the E utmost point of triode Q7 be 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 utmost point of triode Q7, the two ends of described coil-end J1A are parallel with diode D9, the E utmost point ground connection of described triode Q5, the timing end RT of described power supply IC3 is connected with ground by resistance R 17 respectively, by resistance R 3, be connected with the C utmost point of triode Q5, the C utmost point of described triode Q7 is also connected with capacitor C 2 by resistance R 7 respectively, by resistance R 8, be connected with capacitor C 3, described resistance R 7 two ends are parallel with diode D10, described resistance R 8 two ends are parallel with diode D11, the in-phase input end of described comparator IC2 is connected with capacitor C 2 by resistance R 11, the inverting input of described comparator IC2 is connected with capacitor C 3 by resistance R 12, described resistance R 11 is connected with power supply VCC by resistance R 9 respectively, by resistance R 10, be connected with GND, described resistance R 12 is connected with power supply VCC1 by resistance R 13, the output of described comparator IC2 is by diode D12, resistance R 14 is connected with the B utmost point of triode Q8, the E utmost point of described triode Q8 is connected with power supply VCC by resistance R 16, between the B utmost point of described triode Q8 and the E utmost point, be in series with resistance R 15, the C utmost point 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 utmost point of power tube Q1, the G utmost point of power tube Q2, the G utmost point of power tube Q3, the G utmost point of power tube Q4 connects.
Input power cord has three, be X, Y, Z, when three-phase 380V voltage is inputted, access three phase mains, when 220V voltage is inputted, select arbitrarily two in three lines, in three-phase when input, is by D1, D2, D3, D4, D5, D6 forms three-phase bridge rectification circuit, during the input of 220V voltage, by four diodes wherein, form single phase bridge type rectifier circu, rectification is by capacitor C 1 filtering, capacitor C 1 is thin-film capacitor, there is durability good, the advantages such as caloric value is little, during work, electric current after current rectifying and wave filtering circuit 2 rectifying and wave-filterings through sample circuit 3 and enter inverter circuit 4, 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, after transformer T1 transformation, export to power output end 6, power output end 6 also includes two rectifying tube D7 and D8, electric current is through rectifying tube D7, after D8 rectification, export, when input voltage switches to 380V from 220V, input terminal voltage is in process resistance R 1, after resistance R 2 dividing potential drops, the voltage of A end is still greater than the leading energy voltage of amplifier 8 and makes amplifier 8 conductings, thereby make light-emitting diodes pipe end IC1A luminous, phototriode end IC1B conducting after receiving the light that light-emitting diodes pipe end IC1A sends, make the B utmost point of triode Q6 become low level and end, and then make the B utmost point of the triode Q7 that is connected with the E utmost point of triode Q6 become low level and end, thereby the coil-end J1A no current that makes the relay that is connected with the C utmost point of triode Q7 by and do not work, make the switch terminals J1B of relay be switched to normally-closed contact 7 places, thereby change the turn ratio of transformer T1 and then change output voltage, simultaneously, switch terminals J1B at relay switches moment, charge-discharge characteristic due to electric capacity, the high level of the C utmost point of triode Q7 will charge to capacitor C 3 through resistance R 8 and diode D11, now, capacitor C 3 will be given a high level of inverting input input of comparator IC2 through resistance R 12, the length that this high level is held time, capacity by capacitor C 3 determines, and now the in-phase input end of comparator IC2 powers up through resistance R 11 after by resistance R 9 and resistance R 10 dividing potential drops again, 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 R 16, the B utmost point of resistance R 15 to triode Q8, in the situation that the output output low level of comparator IC2, diode D12 conducting, make the B utmost point of triode Q8 become low level, thereby make triode Q8 conducting, make the C utmost point output high level of triode Q8 to the pass broken ends of fractured bone of power supply IC3, power supply IC3 will turn-off the drive waveforms of the output wave of output, thereby by driver module 13 switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, make no-voltage and electric current in voltage handoff procedure pass through relay, when voltage has switched, capacitor C 3 also completes charging, now resistance R 12 and resistance R 13 dividing potential drops recover normal, the inverting input level that makes comparator IC2 drops to normal level and lower than the in-phase input end level of comparator IC2, make the output output high level of comparator IC2, and make the B utmost point of triode Q8 become high level through diode D12 and resistance R 14, make the triode Q8 cannot conducting and then make the pass broken ends of fractured bone of power supply IC3 become low level, make the output wave of the output of power supply IC3 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 in process resistance R 1, after resistance R 2 dividing potential drops, the voltage of A end is less than leading of amplifier 8 can voltage and make the amplifier 8 cannot conducting, thereby make light-emitting diodes pipe end IC1A not luminous, phototriode end IC1B cannot conducting because not receiving light, the B utmost point of triode Q6 will become high level and make triode Q6 conducting, the voltage of the E utmost point of triode Q6 output arrives the B utmost point of triode Q7 after resistance R 5 and resistance R 6 dividing potential drops, make the B utmost point of triode Q7 become high level and conducting, electric current is by the coil-end J1A of the relay of flowing through and triode Q7, now relay adhesive, make the switch terminals J1B of relay be switched to normally opened contact 5 places, thereby change the turn ratio of transformer T1 and then change output voltage, simultaneously, switch terminals J1B at relay switches moment, charge-discharge characteristic due to electric capacity, capacitor C 2 is discharged by triode Q7 more over the ground through diode D10 and resistance R 7, and then process resistance R 11 drags down the level of the in-phase input end of comparator IC2, the capacity of the time dragging down by capacitor C 2 determines, 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 R 16, the B utmost point of resistance R 15 to triode Q8, in the situation that the output output low level of comparator IC2, diode D12 conducting, make the B utmost point of triode Q8 become low level, thereby make triode Q8 conducting, make the C utmost point output high level of triode Q8 to the pass broken ends of fractured bone of power supply IC3, power supply IC3 will turn-off the drive waveforms of the output wave of output, thereby by driver module 13 switch-off power pipe Q1, power tube Q2, power tube Q3, the power stage of power tube Q4, make no-voltage and electric current in voltage handoff procedure pass through relay, meanwhile, due to phototriode end IC1B conducting, thereby the B utmost point that makes triode Q5 becomes high level makes Q5 conducting, now resistance R 3 is equivalent to shorted to earth, resistance R 3 becomes relation in parallel with resistance R 17, thereby change the size of the timing resistor being connected with the timing end RT of power supply IC3, thereby change the output frequency of power supply IC3, after inverter circuit 4 inversion outputs, improve welding performance, increase work efficiency, when voltage has switched, capacitor C 2 also completes electric discharge, now resistance R 9 and resistance R 10 dividing potential drops recover normal, the in-phase input end level that makes comparator IC2 reverts to normal level and higher than the inverting input level of comparator IC2, make the output output high level of comparator IC2, and make the B utmost point of triode Q8 become high level through diode D12 and resistance R 14, make the triode Q8 cannot conducting and then make the pass broken ends of fractured bone of power supply IC3 become low level, make the output wave of the output of power supply IC3 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 utility model, the equalization that all scopes of applying for a patent according to the utility model are done changes and modifies, and all should belong to covering scope of the present utility model.
Claims (10)
1. a circuit structure for two voltage welding machines, 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 utmost point of power tube Q1, the G utmost point of power tube Q2, the G utmost point of power tube Q3, the G utmost point 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 R 19, the other end is connected with sample circuit (3), the C utmost point of described phototriode end IC1B is connected with control voltage commutation circuit (10), the E utmost point of phototriode end IC1B is connected with ground, described phototriode end IC1B is corresponding with light-emitting diodes pipe end IC1A, and described relay pack is drawn together 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, the other end of described coil-end J1A with control voltage commutation circuit (10) and be connected, 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 pair of voltage welding machine according to claim 1, it is characterized in that: described switch back circuit (11) comprises capacitor C 2, capacitor C 3, comparator IC2, triode Q8, the in-phase input end of described comparator IC2 is by resistance R 11, capacitor C 2 is connected with control voltage commutation circuit (10), the inverting input of described comparator IC2 is by resistance R 12, capacitor C 3 is connected with control voltage commutation circuit (10), described resistance R 11 is connected with power supply VCC by resistance R 9 respectively, by resistance R 10, be connected with GND, described resistance R 12 is connected with power supply VCC1 by resistance R 13, the output of described comparator IC2 is connected with the B utmost point of triode Q8 by diode D12, the E utmost point of described triode Q8 is connected with power supply VCC by resistance R 16, the C utmost point of described triode Q8 is connected with control module (12).
3. the circuit structure of a kind of pair of voltage welding machine according to claim 2, it is characterized in that: between described diode D12 and triode Q8, be in series with resistance R 14, between the B utmost point of described triode Q8 and the E utmost point, be in series with resistance R 15, between described capacitor C 2 and control voltage commutation circuit (10), be in series with resistance R 7, described resistance R 7 two ends are parallel with diode D10, between described capacitor C 3 and control voltage commutation circuit (10), be in series with resistance R 8, described resistance R 8 two ends are parallel with diode D11.
4. the circuit structure of a kind of pair of voltage welding machine according to claim 1, it is characterized in that: described control module (12) comprises power supply IC3, resistance R 17, the timing end RT of described power supply IC3 is connected with ground by resistance R 17, 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 pair of 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 R 3, the B utmost point of described triode Q5 is connected with control voltage commutation circuit (10), the E utmost point ground connection of described triode Q5, the C utmost point of described triode Q5 is connected with the timing end RT of power supply IC3 by resistance R 3.
6. the circuit structure of a kind of pair of voltage welding machine according to claim 1, it is characterized in that: described sample circuit (3) comprises resistance R 1, resistance R 2, amplifier (8), diode D13, one end of described resistance R 1 is connected with current rectifying and wave filtering circuit (2) by diode D13, the other end of resistance R 1 is connected with ground by resistance R 2, described resistance R 2 two ends are parallel with capacitor C 5, the A end of described resistance R 1 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 pair of 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 R 18, and described resistance R 1 is parallel with capacitor C 4 with the two ends of the integrating circuit that capacitor C 5 forms.
8. the circuit structure of a kind of pair of 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 exclusive disjunction amplifier.
9. the circuit structure of a kind of pair of 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 utmost point of described triode Q6 is connected with power supply VCC, between the C utmost point of described triode Q6 and the B utmost point, be in series with resistance R 20, the B utmost point of described triode Q6 is connected with the C utmost point of phototriode end IC1B, the E utmost point of described triode Q6 is connected with the B utmost point of triode Q7, the described E utmost point of phototriode end IC1B and the E utmost point of triode Q7 be ground connection respectively, the C utmost point of described triode Q7 is connected with coil-end J1A.
10. the circuit structure of a kind of pair of voltage welding machine according to claim 9, it is characterized in that: between the E utmost point of described triode Q6 and the B utmost point of triode Q7, be in series with resistance R 5, between the B utmost point of described triode Q7 and the E utmost point, be in series with resistance R 6, the two ends of described coil-end J1A are parallel with diode D9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201320589585.6U CN203471120U (en) | 2013-09-24 | 2013-09-24 | Circuit structure of double-voltage welder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320589585.6U CN203471120U (en) | 2013-09-24 | 2013-09-24 | Circuit structure of double-voltage welder |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103480946A (en) * | 2013-09-24 | 2014-01-01 | 永康市帝普特科技有限公司 | Circuit structure of double-voltage welding machine |
| CN105880819A (en) * | 2016-03-26 | 2016-08-24 | 广州微点焊设备有限公司 | Microscopic-welding point welding machine for hot-pressing electric resistance welding |
| CN106141376A (en) * | 2016-08-24 | 2016-11-23 | 台州林轩科技有限公司 | The industrial frequency rectifying filtering circuitry of twin voltage inverter arc welding machine |
| CN107256058A (en) * | 2017-08-04 | 2017-10-17 | 温岭阿凡达机电有限公司 | A kind of transformer switching circuit and switching method |
-
2013
- 2013-09-24 CN CN201320589585.6U patent/CN203471120U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103480946A (en) * | 2013-09-24 | 2014-01-01 | 永康市帝普特科技有限公司 | Circuit structure of double-voltage welding machine |
| CN103480946B (en) * | 2013-09-24 | 2015-04-29 | 永康市帝普特科技有限公司 | Circuit structure of double-voltage welding machine |
| CN105880819A (en) * | 2016-03-26 | 2016-08-24 | 广州微点焊设备有限公司 | Microscopic-welding point welding machine for hot-pressing electric resistance welding |
| CN105880819B (en) * | 2016-03-26 | 2019-03-26 | 广州微点焊设备有限公司 | Hot pressing electric resistance welding micro welding contact welding machine |
| CN106141376A (en) * | 2016-08-24 | 2016-11-23 | 台州林轩科技有限公司 | The industrial frequency rectifying filtering circuitry of twin voltage inverter arc welding machine |
| CN107256058A (en) * | 2017-08-04 | 2017-10-17 | 温岭阿凡达机电有限公司 | A kind of transformer switching circuit and switching method |
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