CN114226920B - Global general welding machine circuit selection method and system - Google Patents

Global general welding machine circuit selection method and system Download PDF

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Publication number
CN114226920B
CN114226920B CN202210017799.XA CN202210017799A CN114226920B CN 114226920 B CN114226920 B CN 114226920B CN 202210017799 A CN202210017799 A CN 202210017799A CN 114226920 B CN114226920 B CN 114226920B
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circuit
voltage value
coupled
welding
relay
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CN114226920A (en
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张辉
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Wenling Avatar Electromechanics Manufacture Co ltd
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Wenling Avatar Electromechanics Manufacture Co ltd
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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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding Control (AREA)

Abstract

The application relates to a circuit selection method and a system of a global universal welding machine, which comprises the following steps: receiving an actual voltage value; comparing the actual voltage value with a plurality of preset voltage value range areas, and selecting a plurality of corresponding welding circuits according to the comparison result, wherein the number of the welding circuits corresponding to the voltage value range areas is multiple; and according to the voltage value range area in which the changed actual voltage value falls and the voltage value rising trend, making a response of reselecting the welding circuit, wherein the voltage value rising trend is the rising change trend of the actual voltage value. The welding machine can work normally under the voltage of 110V, 220V and 380V, and is wide in application range; this application can be undulant in each district electric wire netting discovery, leads to the voltage reduction back, keeps the state of relay, prevents that arc drawing and glutinous phenomenon from appearing in the relay, has prolonged the life-span of relay in the welding machine.

Description

Global general welding machine circuit selection method and system
Technical Field
The application relates to the field of welding machine control, in particular to a circuit selection method and system of a global general welding machine.
Background
A welder is defined as a device that provides the energy and motion required to complete a welding process, including the movement of the welding wire and torch and the control system.
The electric welding machine is actually a transformer with external characteristics of reduction, 220V or 380V alternating current is converted into low-voltage direct current, and the electric welding machine can be generally divided into two types according to the types of output power supplies, wherein one type is an alternating current power supply; one is direct current.
In the related art, the common welder can only work under one voltage, and the voltage of 110V is available in all regions of the world except 220V and 380V, and the common welder cannot be applied to the voltage of all regions of the world.
Disclosure of Invention
In order to enable the welding machine to be suitable for voltages of all regions of the world, the application provides a circuit selection method and a system of the global general welding machine.
The circuit selection method of the global general welding machine adopts the following technical scheme.
A circuit selection method for a global flux welder comprises the following steps:
receiving an actual voltage value;
comparing the actual voltage value with a plurality of preset voltage value range areas, and selecting a plurality of corresponding welding circuits according to the comparison result, wherein the number of the welding circuits corresponding to the voltage value range areas is multiple;
and making a response of reselecting the welding circuit according to the voltage value range area in which the changed actual voltage value falls and the voltage value rising trend, wherein the voltage value rising trend is the rising change trend of the actual voltage value.
By adopting the technical scheme, the proper welding circuit is selected by judging the voltage value, so that the welding circuit can actually work under 380V, 220V and 110V voltages, and the welding circuit is reselected through the voltage value range area in which the voltage value rising trend and the changed actual voltage value fall, so that the welding machine can be adjusted intelligently according to the change of the voltage in the area.
Preferably, while the response of reselecting the welding circuit is made according to the voltage value range region in which the changed actual voltage value falls and the voltage value rising trend, the method further includes the steps of:
and making a response for maintaining the current welding circuit according to a voltage value descending trend, wherein the voltage value descending trend is a descending change trend of the actual voltage value.
Through adopting above-mentioned technical scheme, relay in the welding machine jumps to the low-voltage by the high voltage after, can appear drawing the arc, the phenomenon of gluing, and area voltage generally changes, and after the voltage drop, just switch the reselection circuit with the relay, then can make the life-span reduction of relay, consequently this self keeps the state of relay after the voltage drop, makes its difficult appearance draw the arc, the phenomenon of gluing for the life of welding machine can improve.
The application also provides a circuit selection system of the global general welding machine.
A global flux welder circuit selection system comprising:
a plurality of welding circuits;
the judgment circuit module is used for receiving the actual voltage value, comparing the actual voltage value with a plurality of preset voltage value range areas and selecting a corresponding welding circuit according to a comparison result, wherein the number of the welding circuit corresponding to the voltage value range areas is multiple;
and the control circuit module makes a response of reselecting the welding circuit according to the voltage value range area in which the changed actual voltage value falls and the voltage value rising trend, wherein the voltage value rising trend is the rising change trend of the actual voltage value.
Preferably, the control circuit module is further configured to respond to a trend of decreasing, maintaining the current welding circuit.
Preferably, the plurality of welding circuits specifically include a first welding circuit, a second welding circuit and a third welding circuit, the first welding circuit includes an input rectification circuit, a filter inverter circuit, a transformer circuit and an output rectification circuit, the first rectification circuit is used for inputting voltage, the input rectification circuit includes a first rectifier bridge B1 and a second rectifier bridge B2 which are connected in series, the output end of the first rectifier bridge B1 and the output end of the second rectifier bridge B2 are both coupled to a filter inverter circuit, the output end of each filter inverter circuit is coupled to a transformer circuit, the transformer circuit includes a primary coil and a secondary coil, the primary coil is coupled to the filter inverter circuit, the secondary coil is coupled to the output rectification circuit, the primary coil includes a first primary sub-coil and a second primary sub-coil which are connected in series, the output end of the output rectifying circuit is used for connecting welding rods, the second welding circuit and the first welding circuit are different in that a first rectifier bridge B1 and a second rectifier bridge B2 are connected in parallel, and the third welding circuit and the second welding circuit are different in that a primary coil only comprises a first primary sub-coil.
Through adopting above-mentioned technical scheme, when voltage is 380V, with first rectifier bridge B1, second rectifier bridge B2 series connection, when voltage is 220V with first rectifier bridge B1, second rectifier bridge B2 is parallelly connected, when voltage is 110V, with first rectifier bridge B1, second rectifier bridge B2 is parallelly connected, and separate second primary coil from the circuit and only insert first primary sub-coil into the circuit, make the transformation ratio grow, make the voltage of welding machine output, satisfy actual need, the transformation cost of this scheme is handed over, have higher economic benefits.
Preferably, the determining circuit module includes a first comparing circuit, a second comparing circuit, a first relay control circuit, and a second relay control circuit, the first comparing circuit is coupled to the first relay control circuit, a positive phase input terminal of the first comparing circuit is used for detecting an input actual voltage, a negative phase input terminal of the first comparing circuit is used for inputting a first reference voltage, the second comparing circuit is coupled to the second relay control circuit, the first relay control circuit is coupled to the rectifying circuit for switching series-parallel connection of the first rectifying bridge B1 and the second rectifying bridge B2 according to a level signal output by the first comparing circuit, the second relay control circuit is coupled to the transforming circuit for outputting a positive level at the second comparing circuit to connect the second primary sub-coil in series with the first primary coil, and the positive phase input terminal of the second comparing circuit is used for detecting an input actual voltage, The inverting input terminal is used for inputting a second reference voltage.
By adopting the technical scheme, the input actual voltage is judged through the first comparison circuit, then the series-parallel connection of the first rectifier bridge B1 and the second rectifier bridge B2 is switched through the first relay control circuit to meet the use requirements of 380V and 220V, the voltage at two ends of the first rectifier bridge B1 or the second rectifier bridge B2 is adjusted, and the second primary sub-coil and the first primary sub-coil are connected in series under 220V and 380V or are connected in single under 110V through the second comparison voltage and the second relay control circuit, so that the output voltage of the output rectification circuit meets the welding requirements.
Preferably, the control circuit module includes a first locking circuit coupled to the first comparing circuit and a second locking circuit coupled to the second comparing circuit, the first locking circuit is configured to maintain the level signal output by the first comparing circuit after the actual voltage value drops below the first reference voltage, and the second locking circuit is configured to maintain the level signal output by the second comparing circuit after the actual voltage value drops below the second reference voltage.
Through adopting above-mentioned technical scheme, first locking circuit and second locking circuit can lock the level signal of first comparison circuit and second comparison circuit output because of undulant decline back at the welding machine voltage, keep the state of welding machine internal relay, make it be difficult for appearing because of the frequent phenomenon of disconnection of fluctuation close for the relay is difficult for appearing drawing an arc and the adhesion phenomenon.
Preferably, the filtering inverter circuit is coupled with a power drive control circuit for controlling the on/off of the filtering inverter circuit, the power drive control circuit is coupled with a first delay circuit for controlling the self-delay first standard time to start, the input rectification circuit is coupled with a second delay circuit for controlling the self-delay second standard time to start, the first relay control circuit is coupled with a third delay circuit for controlling the self-delay third standard time to start, the second relay control circuit is coupled with a fourth delay circuit for controlling the self-delay fourth standard time to start, and the durations of the first standard time, the second standard time, the fourth standard time and the third standard time sequentially decrease.
By adopting the technical scheme, the first time delay circuit, the second time delay circuit, the third time delay circuit and the fourth time delay circuit enable the input rectifying circuit and the power supply drive control circuit to be sequentially switched on after the welding circuit is selected by the judgment circuit module, so that the welding circuit is not easy to be abnormal due to early electrification.
Preferably, an indication circuit for indicating the on/off of the first relay control circuit is coupled to the first comparison circuit.
Through adopting above-mentioned technical scheme, indicating circuit's setting, the personnel of being convenient for know first relay control circuit and whether open.
In summary, the present application includes at least one of the following beneficial technical effects:
the welding machine can work normally under the voltage of 110V, 220V and 380V, and is wide in application range;
according to the method, the state of the relay can be maintained after voltage is reduced due to fluctuation of power grids in various regions, arc discharge and adhesion of the relay are prevented, and the service life of the relay in the welding machine is prolonged;
this application makes judgement circuit module can be prior to welding circuit and starts through setting up first delay circuit, second delay circuit, third delay circuit and fourth delay circuit for welding circuit is difficult to cause the influence to the initial judgement of judgement circuit module.
Drawings
FIG. 1 is a flowchart of a method for selecting a global flux welder circuit according to an embodiment of the present application.
FIG. 2 is an overall architecture diagram of a global welder circuit selection system according to an embodiment of the present application.
Fig. 3 is an architecture diagram of a power supply drive control circuit according to an embodiment of the present application.
Fig. 4 is a circuit diagram of a judgment circuit module and a selection circuit module according to an embodiment of the present application.
Fig. 5 is a circuit diagram of a first delay circuit according to an embodiment of the present application.
Description of reference numerals: 1. an input rectification circuit; 2. a filter inverter circuit; 21. a filter sub-circuit; 22. an inverter sub-circuit; 3. a voltage transformation circuit; 4. an output rectifying circuit; 5. a judgment circuit module; 51. a first comparison circuit; 52. a second comparison circuit; 53. a first relay control circuit; 54. a second relay control circuit; 6. a control circuit module; 61. a first locking circuit; 62. a second locking circuit; 7. a power supply controller; 8. a second delay circuit; 9. a first delay circuit; 10. a third delay circuit; 11. a fourth delay circuit; 12. a power supply drive control circuit; 13. a drive controller; 14. a PWM controller; 15. an indication circuit.
Detailed Description
The embodiment of the application discloses a circuit selection method of a global general welding machine.
Referring to fig. 1, a circuit selection method for a global general welding machine comprises the following steps:
s1: receiving an actual voltage value;
specifically, the method comprises the following steps: inputting the actual voltage value into a judgment circuit module 5;
s2: comparing the actual voltage value with a plurality of preset voltage value range areas, and selecting a corresponding welding circuit according to a comparison result;
specifically, the method comprises the following steps: the number of the welding circuits is multiple corresponding to the voltage value range regions, the judgment circuit module 5 compares the actual voltage value with the preset voltage value range regions, wherein the voltage value range regions are composed of a plurality of different voltage reference values, for example, the voltage reference values in the embodiment are 110V and 220V, the actual voltage is compared with the voltage reference values of 110V and 220V, if the actual voltage is greater than 220V, the first welding circuit is selected, the second welding circuit is selected from 220V to 110V, and the third welding circuit is selected below 110V. Of course, the voltage reference values of 110V and 220V may have other values in other embodiments.
S3: and according to the voltage value range area in which the changed actual voltage value falls and the voltage value ascending trend, making a response of reselecting the welding circuit, and according to the descending trend, making a response of keeping the current welding circuit.
Specifically, the voltage value rising trend is a rising change trend of the actual voltage value; the voltage value falling trend is a falling change trend of an actual voltage value, after the actual voltage value changes, if the actual voltage value rises, for example, from 110V to 220V to 380V, the control circuit module 6 controls the selection circuit module to switch the welding circuit from the second welding circuit to the first welding circuit according to a voltage value range region 220V into which the actual voltage value finally falls, but in order to prevent arc discharge of an electrical element mainly of a relay caused by switching from high voltage to low voltage, when the voltage drops from 380V to 220V, the control circuit module 6 controls the selection circuit module to keep unchanged, and the first welding circuit is kept working.
The implementation principle of the circuit selection method of the global general welding machine in the embodiment of the application is as follows: the control circuit is adopted to switch the circuit from low voltage to high voltage, and the switching from the high voltage to the low voltage is not carried out.
The application also discloses a global general welding machine circuit selection system.
Referring to fig. 2 and 3, the circuit selection system of the global general welding machine comprises a welding circuit, a judgment circuit module 5, a control circuit module 6 and a power supply controller 7. The welding circuit comprises a first welding circuit, a second welding circuit and a third welding circuit, and the power supply controller 7 is in the prior art and is mainly used for converting commercial power into 5V, 15V and 24V direct-current power supplies so as to supply power to all modules in the welding machine.
The first welding circuit is used for supplying voltage of more than 220V and 380V to a welding machine so as to supply power for welding. The first welding circuit specifically comprises an input rectification circuit 1, a filter inverter circuit 2, a voltage transformation circuit 3 and an output rectification circuit 4. The input end of the input rectifying circuit 1 is coupled to a current source, the rectifying circuit comprises a first rectifying bridge B1, a second rectifying bridge B2, a relay K2 and a relay K3, the first rectifying bridge B1 is provided with a first input end, a second input end, a forward output end and a reverse output end, the second rectifying bridge B2 is also provided with a first input end, a second input end, a forward output end and a reverse output end, the first input end of the first rectifying bridge B1 is connected with a power live wire, the first input end of the second rectifying bridge B2 is connected with a power neutral wire, a first terminal is led out from the power live wire, a second terminal is led out from the power live wire, the relay K3 contact switch and the relay K2 contact switch are provided with two lines for switching contact switches, two ends of one line of the relay K2 contact switch are respectively connected with the power live wire, the second input end of the second rectifying bridge B2 is connected with the other line of the relay K2 contact switch, and two ends of the other line of the relay K3 contact switch are respectively connected with the relay K3 contact switch, A second input of second rectifier bridge B2; two ends of one line of the relay K3 contact switch are respectively connected with the contact switch of the relay K2 and the second input end of the second rectifier bridge B1, and two ends of the other line of the relay K3 contact switch are respectively connected with the second input end of the second rectifier bridge B1 and the power supply zero line. When the coils of the relay K2 and the relay K3 do not work, the first rectifier bridge B1 and the second rectifier bridge B2 are connected in series, so that the welding machine can work normally under the voltage of more than 380V. When the coils of the relay K2 and the relay K3 work, the first rectifier bridge B1 and the second rectifier bridge B2 are connected in parallel, so that the first welding circuit is changed into a second welding circuit, and the welder works normally under the voltage of 220V.
The second input end of the first rectifier bridge B1 is coupled with respect to the first input end of the second rectifier bridge B2 through a contact switch of a relay K3, and the second input end of the second rectifier bridge B2 is connected with a zero line.
The output of first rectifier bridge B1, second rectifier bridge B2 all couples a filtering inverter circuit 2, filtering inverter circuit 2 includes filter sub-circuit 21 and inverter sub-circuit 22, filter sub-circuit 21 couples with the forward output of first rectifier bridge B1 or second rectifier bridge B2 and reverse output, inverter sub-circuit 22's input is coupled with filter sub-circuit 21, inverter sub-circuit 22's output is coupled with transform circuit 3, transform circuit 3 corresponds inverse inverter sub-circuit 22 and is equipped with two sets ofly.
The filter sub-circuit 21 includes a first polarity capacitor C1, a second polarity capacitor C2, a third polarity capacitor C3 and a fourth polarity capacitor C4, the first polarity capacitor C1 is connected in series with the second polarity capacitor C2, an anode of the first polarity capacitor C1 is coupled to the forward output end of the first rectifier bridge B1, a cathode of the second polarity capacitor C2 is coupled to the reverse output end of the first rectifier bridge B1, the third polarity capacitor C3 is connected in parallel with the first polarity capacitor C1, the fourth polarity capacitor C4 is connected in parallel with the second polarity capacitor C2, an anode of the third polarity capacitor C3 is coupled to a resistor R1, the other end of the resistor R1 is coupled to a cathode of the fourth polarity capacitor C4, and a cathode of the fourth polarity capacitor C4 is grounded.
The inverter sub-circuit 22 is an IGBT circuit employing DC650V, the inverter sub-circuit 22 includes a transistor Q1 and a transistor Q2, a collector of the transistor Q1 is coupled to an anode of a third polar capacitor C3, an emitter of the transistor Q1 is coupled to a resistor R4, another end of the resistor R4 is coupled to a resistor R5, another end of the resistor R5 is coupled to a sixth capacitor C6, another end of the sixth capacitor C6 is grounded, a collector of the transistor Q1 is also coupled to a resistor R2, another end of the resistor R2 is coupled to a resistor R3, another end of the resistor R3 is coupled to a fifth capacitor C5, a fifth capacitor C5 is coupled to an emitter of the transistor Q1, and a base of the transistor Q1 is coupled to the power supply drive control circuit 12.
The power driving control circuit 12 includes a resistor R6, a resistor R7, a diode D1, and a capacitor C7, wherein the resistor R6 is coupled to the base of the transistor Q1, the other end of the resistor R6 is coupled to the anode of the diode D1, the anode of the diode D1 is coupled to one end of the driving power supply, one end of the resistor R7 is coupled to the base of the transistor Q1, the other end of the resistor R7 is coupled to the cathode of the diode D1, one end of the capacitor C7 is coupled to the base of the transistor Q1, the other end of the capacitor C7 is coupled to the driving power supply, and the emitter of the transistor Q1 is also coupled to the end of the capacitor C7 away from the resistor R7 to form a loop. The collector of the transistor Q1 is further coupled with a capacitor C8, a capacitor C8 is coupled with a capacitor C9, and the other end of the capacitor C9 is grounded. The collector of the transistor Q2 is coupled to the emitter of the transistor Q1, the emitter of the transistor Q2 is grounded, the base of the transistor Q2 is also coupled to a set of power driving control circuits 12, and the sets of power driving control circuits 12 share a driving power supply.
The electrical connection point between the capacitor C8 and the capacitor C9 is coupled to the transformer circuit 3, the transformer circuit 3 includes a transformer T1 and a relay K5, the transformer T1 includes a first primary coil, a second primary coil and a secondary coil, the first primary coil is coupled to the electrical connection point between the capacitor C8 and the capacitor C9, and the second primary coil is coupled to the emitter of the transistor Q1. When the relay K5 is not electrified, the contact switch of the relay K5 enables the first primary coil to be connected with the second primary coil in series; when the relay K5 is energized, the contact switch of the relay K5 couples the other end of the first primary coil directly to the electrical connection point between the second primary coil and the emitter of the transistor Q1, the second primary coil is disconnected, the voltage ratio of the secondary coil of the transformer T1 to the primary coil is increased, and under the condition that the first rectifier bridge B1 and the second rectifier bridge B2 are connected in parallel, the first welding circuit jumps to a third welding circuit, so that the welding machine can work at a voltage of 110V.
The secondary coil of the transformer T1 is coupled to the output rectifying circuit 4, the output rectifying circuit 4 is an existing welding machine circuit module, and specifically, the content of chinese patent with publication No. CN211018671U can be referred to, one output rectifying circuit 4 is coupled to each group of voltage transformation circuits 3, and the output end of the output rectifying circuit 4 is used for connecting welding rods. In this embodiment, the output rectifying circuit 4 is further coupled with an anti-sticking circuit to prevent the welding rod from being adhered to the output end of the welding machine due to excessive current, and the output rectifying circuit 4 is further coupled with a thrust circuit to compensate the welding rod current when the current is too small, so that the welding machine can stably operate. The anti-sticking circuit and the thrust circuit are conventional circuit arrangements in the inverter welding machine, and detailed description is not provided in the embodiment.
In addition, a second delay circuit 8 is coupled to the input rectifying circuit 1, the second delay circuit 8 comprises a relay K1 and a field effect transistor U7, a zener diode D14 and a polar capacitor C19, a contact switch of the relay K1 is connected in series between the first rectifier bridge B1 and the ac power supply, one end of a coil of the relay K1 is connected to a 24V dc voltage, the other end is coupled to a drain of the field-effect transistor U7, a source of the field-effect transistor U7 is grounded, a gate of the field-effect transistor U7 is coupled to an anode of the zener diode D14, a cathode of the zener diode D14 is coupled to an anode of the polar capacitor C19, a cathode of the polar capacitor C19 is grounded, a cathode of the zener diode D14 is further coupled to a resistor R23, the other end of the resistor R23 is connected to the 24V power supply, a gate of the field-effect transistor U7 is coupled to a resistor R24, the other end of the resistor R24 is grounded, a coil of the relay K1 is further connected in parallel to a diode D15, and an anode of the diode D15 is coupled to a drain of the field-effect transistor U7. The contact switch of the relay K1 is also connected in parallel with a thermistor RR 1.
Referring to fig. 2 and 4, a judgment circuit module 5 for comparing the actual voltage value with a plurality of preset voltage value range regions; specifically, the method comprises the following steps: the judgment circuit module 5 specifically includes a first comparison circuit 51, a second comparison circuit 52, a first relay control circuit 53, and a second relay control circuit 54, the driving power supply includes a PWM controller 14 and a driving controller 13, the PWM controller 14, the driving controller 13, and the PWM controller 14 can refer to the chinese patent with publication number CN211018671U, and the driving controller 13 is controlled by the PWM controller 14 to supply power to the base of the transistor Q1.
Referring to fig. 2 and 5, the PWM controller 14 is coupled with a first delay circuit 9, and the first delay circuit 9 is coupled with a soft start terminal of the PWM controller 14.
The first delay circuit 9 includes a transistor Q4, a transistor Q5, a zener diode Z06, and a polar capacitor E09, wherein a capacitance of the polar capacitor E09 is 220 uF. The base of the transistor Q4 is connected with a resistor R037, the other end of the resistor R037 is connected with a 15V power supply, the emitter of the transistor Q4 is grounded, the base of the transistor Q4 is coupled with the collector of the transistor Q5, the emitter of the transistor Q5 is also grounded, the base of the transistor Q5 is coupled with a capacitor C057, the other end of the capacitor C057 is grounded, the base of the transistor Q5 is coupled with the anode of a zener diode Z06, the cathode of the diode Z06 is coupled with the anode of a polar capacitor E09, the cathode of the polar capacitor E09 is grounded, the anode of the polar capacitor E09 is further coupled with a diode D06, the cathode of the diode D06 is connected with a 15V direct current power supply, the diode D06 is connected with a resistor R033 in parallel, the collector of the transistor Q4 is coupled with a resistor R92, the other end of the resistor R92 is coupled with a diode D26, the anode of a diode D26 is coupled with a resistor R36, the other end of the transistor R36 is coupled with the base of the transistor Q6, and the base of the transistor Q6 is coupled with a resistor R36, a resistor R46 is coupled to an electric connection point between a base of the triode Q6 and the resistor R36, the other end of the resistor R46 is grounded, a capacitor C24 is connected in parallel with the resistor R36, a resistor R37 is coupled to a collector of the triode Q6, the other end of the resistor R37 is connected with a 15V direct-current power supply, a zener diode Z6 is coupled to an electric connection point between the diode D26 and the resistor R36, a cathode of the zener diode Z6 is coupled with the resistor R33, the other end of the resistor R33 is connected with a 15V power supply, a triode Q7 is coupled to an electric connection point between the resistor R37 and a collector of the triode Q6, an emitter of the triode Q7 is grounded, and a collector of the triode Q7 is coupled to a soft start end of a UTC3525AJ chip in the PWM controller 14, and the capacitor is connected to the soft start end of the UTC35 3525AJ chip in a delayed manner, so that the PWM controller 14 operates.
Referring to fig. 2 and 4 again, the first comparison circuit 51 is coupled to the first relay control circuit 53, the first comparison circuit 51 includes a comparator U1 and a photoelectric coupler U2, a resistor R8 is coupled to an inverting input terminal of the comparator U1, the other end of the resistor R8 is connected to a 5V dc power supply, a capacitor C10 is coupled to a forward input terminal of the comparator U1, the other end of the capacitor C10 is grounded, a resistor R9 is further coupled to a forward input terminal of the comparator U1, the other end of the resistor R9 is connected to a live wire of an ac power supply, a resistor R10 is further coupled to an electrical connection point between the resistor R9 and the forward input terminal of the comparator U1, a resistor R11 is coupled to the other end of the resistor R10, and the other end of the resistor R11 is grounded.
The output end of the comparator U1 is connected with the first input pin of the photoelectric coupling U2, the second input pin of the photoelectric coupling U2 is grounded, a resistor R12 is connected in series between the comparator U1 and the photoelectric coupling U2, one output pin of the photoelectric coupling U2 is grounded, the other output pin is coupled with an indicating circuit 15, the indicating circuit 15 comprises a light emitting diode LED3, the cathode of the light emitting diode LED3 is coupled with the output pin of the photoelectric coupling U2, the anode of the light emitting diode LED3 is connected with a resistor R13, the other end of the resistor R13 is connected with a 24V DC power supply, the cathode of the light emitting diode LED3 is coupled with the cathode of a diode D2, the anode of a diode D2 is coupled with a diode D3, the cathode of the diode D3 is connected with the 24V DC power, the diode D3 is connected with a resistor R14, the anode of the diode D2 is further coupled with a voltage stabilizing diode D4, the electrical connection point between the diode D4 and the stabilizing diode D4 is coupled with a polarity capacitor C4, the cathode of the polarity C4 is grounded, the value of the polar capacitance C11 was 47 uF. The first relay control circuit 53 comprises a field effect transistor U3, an anode of a voltage stabilizing diode D4 is coupled to a gate of a field effect transistor U3, a polarity capacitor C11 is grounded to form the third delay circuit 10, a coil of a relay K2 and a coil of a relay K3 are both connected in series between a drain of the field effect transistor U3 and a 24V dc power supply, a diode D5 is coupled to an electrical connection point between the relay K3 and the drain of the field effect transistor U3, a cathode of the diode D5 is connected to the 24V dc power supply, a source of the field effect transistor U3 is grounded, and a capacitor C12 is connected in series between the source and the gate of the field effect transistor U3. When the input voltage of the circuit is 220V-110V, the comparator U1 outputs low level, the field effect transistor U3 is conducted, the coil of the relay K2 and the coil of the relay K3 are connected with electricity, and therefore the first welding circuit is switched to the second welding circuit, and the welding machine can work normally.
The control circuit module 6 includes a first locking circuit 61 and a second locking circuit 62, the first locking circuit 61 includes a zener diode D6, a transistor Q20 and a polarity capacitor C13, an output terminal of the comparator U1 is coupled with a resistor R15, the other terminal of the resistor R15 is coupled with a diode D7, a cathode of the diode D7 is coupled with an anode of the polarity capacitor C13, a cathode of the polarity capacitor C13 is grounded, an electrical connection point between the cathode of the diode D7 and the anode of the polarity capacitor C13 is coupled with a cathode of the zener diode D6, an anode of the zener diode D6 is coupled with a base of the transistor Q20, an emitter of the transistor Q20 is grounded, and a collector of the transistor Q20 is coupled with an electrical connection point between the resistor R8 and the comparator U1. For example, after the comparator U1 outputs a high level, the transistor Q2 is turned on, and the reverse phase input terminal of the comparator U1 is pulled to 0V, so that after the level of the positive phase input terminal of the comparator U1 is lowered from 380V to below 220V, the comparator U1 still keeps outputting the high level, and after the voltage is lowered due to fluctuation, the relay K2 and the relay K3 cannot jump to cause arc discharge and adhesion.
It should be noted that the second relay control circuit 54 and the second locking circuit 62 are both coupled to the second comparing circuit 52, and the second comparing circuit 52 is coupled to the second relay control circuit 54.
The second comparison circuit 52 comprises a comparator U4 and a photoelectric coupler U5, wherein a resistor R16 is coupled to the reverse input end of the comparator U4, the other end of the resistor R16 is connected to a 5V dc power supply, a capacitor C14 is coupled to the forward input end of the comparator U4, the other end of the capacitor C14 is grounded, a resistor R17 is further coupled to the forward input end of the comparator U4, the other end of the resistor R17 is connected to the live wire of an ac power supply, a resistor R18 is further coupled to an electrical connection point between the resistor R17 and the forward input end of the comparator U4, a resistor R19 is coupled to the other end of the resistor R18, and the other end of the resistor R19 is grounded.
The output end of the comparator U4 is connected with the first input pin of the photoelectric coupler U5, the second input pin of the photoelectric coupler U5 is grounded, a resistor R20 is connected in series between the comparator U4 and the photoelectric coupler U5, one output pin of the photoelectric coupler U5 is grounded, the other output pin of the photoelectric coupler U5 is coupled with a diode D8, the anode of the diode D8 is connected with a resistor R21, the other end of the resistor R21 is connected with a 24V direct-current power supply, the resistor R21 is connected in parallel with the diode D9, the cathode of the diode D9 is connected with a 24V power supply, the anode of the diode D8 is coupled with a diode D10, and the cathode of the diode D10 is coupled with the cathode of the light-emitting diode LED 3. The anode of the diode D8 is further coupled with a zener diode D11, a polar capacitor C15 is coupled to an electrical connection point between the diode D8 and the zener diode D11, the cathode of the polar capacitor C15 is grounded, the polar capacitor C15 is connected in parallel with the polar capacitor C16, the cathode of the polar capacitor C16 is grounded, the value of the polar capacitor C15 is 47uF, and the value of the polar capacitor C16 is 22 uF.
The second relay control circuit 54 includes a fet U6, a zener diode D11 having an anode coupled to the gate of the fet U6, and a polarity capacitor C15 and a polarity capacitor C16 grounded to form the fourth delay circuit 11. The coil of the relay K5 and the coil of the relay K4 in the other transformation circuit 3 are connected in series between the drain of the field effect tube U6 and a 24V direct current power supply, the electric connection point between the coil of the relay K4 and the drain of the field effect tube U6 is coupled with a diode D12, the cathode of the diode D12 is connected with the 24V direct current power supply, the source of the field effect tube U6 is grounded, and a capacitor C17 is connected in series between the source and the gate of the field effect tube U6.
After the input voltage of the circuit is reduced to be lower than 110V from 220V to 110V, the field effect tube U6 and the field effect tube U3 are conducted, and the coil of the relay K2, the coil of the relay K3, the coil of the relay K4 and the coil of the relay K5 are electrified, so that the second welding circuit is switched to a third welding circuit, and the welding machine can normally work under the voltage of being lower than 110V.
The second latch circuit 62 includes a zener diode D13, a transistor Q30, and a polar capacitor C18, wherein the output terminal of the comparator U4 is coupled to a resistor R22, the other terminal of the resistor R22 is coupled to a diode D14, the cathode of the diode D14 is coupled to the anode of the polar capacitor C18, the cathode of the polar capacitor C18 is grounded, an electrical connection point between the cathode of the diode D14 and the anode of the polar capacitor C18 is coupled to the cathode of the zener diode D13, the anode of the zener diode D13 is coupled to the base of the transistor Q30, the emitter of the transistor Q30 is grounded, and the collector of the transistor Q30 is coupled to the electrical connection point between the resistor R16 and the comparator U1.
After the comparator U4 outputs a positive level when being electrified for the first time, the second locking circuit 62 can ground the inverting input terminal of the comparator U4 and lock the comparator U4, so that after the input voltage is reduced to 110V, the comparator U4 can not output a low level, and the relay K4 and the relay K5 are attracted.
In addition, due to the arrangement of the first delay circuit 9, the second delay circuit 8, the third delay circuit 10 and the fourth delay circuit 11, due to the different capacities of the polar capacitors, after the power is switched on, the third delay circuit 10 firstly starts the relay K2 and the relay K3 to act, then the fourth delay circuit 11 is started to control the relay K4 and the relay K5 to act, a welding circuit is selected, finally the second delay circuit 8 is started to power on the welding circuit, then the first delay circuit 9 is started to control the inverter sub-circuit 22 to operate.
The implementation principle of the circuit selection system of the global general welding machine in the embodiment of the application is as follows: after the welding machine is connected with a voltage of more than 220V, a judgment circuit module 5 in the welding machine starts to judge the voltage at the first time, selects a first welding circuit and locks the circuit;
after the welding machine is connected with the voltage between 220V and 110V, a judgment circuit module 5 in the welding machine starts to judge the voltage at the first time, and a second welding circuit is selected;
after the welding machine is connected with the voltage below 110V, the judgment circuit module 5 in the welding machine starts to judge the voltage at the first time, and selects a third welding circuit.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. A circuit selection method of a global general welding machine is characterized by comprising the following steps: the method comprises the following steps:
receiving an actual voltage value;
comparing the actual voltage value with a plurality of preset voltage value range areas, and selecting a plurality of corresponding welding circuits according to the comparison result, wherein the number of the welding circuits corresponding to the voltage value range areas is multiple;
according to the voltage value range area in which the changed actual voltage value falls and the voltage value rising trend, making a response of reselecting the welding circuit, wherein the voltage value rising trend is the rising change trend of the actual voltage value;
and making a response for maintaining the current welding circuit according to a voltage value descending trend, wherein the voltage value descending trend is a descending change trend of the actual voltage value.
2. A system based on the method for selecting the circuit of the global general welder of claim 1, comprising:
a plurality of welding circuits;
the judgment circuit module (5) is used for comparing the actual voltage value with a plurality of preset voltage value range areas and selecting a corresponding welding circuit according to the comparison result, wherein the number of the welding circuit corresponding to the voltage value range areas is multiple;
and the control circuit module (6) responds to reselect the welding circuit according to the voltage value range area in which the changed actual voltage value falls and the voltage value rising trend, wherein the voltage value rising trend is the rising change trend of the actual voltage value.
3. The system of the global flux welder circuit selection method according to claim 2, wherein: the control circuit module (6) is also used for making a response for maintaining the current welding circuit according to the descending trend.
4. The system of the global flux welder circuit selection method according to claim 3, wherein: the welding circuits specifically comprise a first welding circuit, a second welding circuit and a third welding circuit, the first welding circuit comprises an input rectifying circuit (1), a filtering inverter circuit (2), a voltage transformation circuit (3) and an output rectifying circuit (4), the input rectifying circuit (1) is used for supplying voltage input, the input rectifying circuit (1) comprises a first rectifying bridge B1 and a second rectifying bridge B2 which are mutually connected in series, the output end of the first rectifying bridge B1 and the output end of the second rectifying bridge B2 are both coupled with the filtering inverter circuit (2), the output end of each filtering inverter circuit (2) is coupled with one voltage transformation circuit (3), the voltage transformation circuit (3) comprises a primary coil and a secondary coil, the primary coil is coupled with the filtering inverter circuit (2), the secondary coil is coupled with the output rectifying circuit (4), the primary coil comprises a first primary sub-coil and a second primary sub-coil which are connected in series, the output end of the output rectifying circuit (4) is used for connecting welding rods, the second welding circuit and the first welding circuit are different in that a first rectifying bridge B1 and a second rectifying bridge B2 are connected in parallel, and the third welding circuit and the second welding circuit are different in that the primary coil only comprises the first primary sub-coil.
5. The system of the global flux welder circuit selection method according to claim 4, wherein: the judging circuit module (5) comprises a first comparison circuit (51), a second comparison circuit (52), a first relay control circuit (53) and a second relay control circuit (54), wherein the first comparison circuit (51) is coupled with the first relay control circuit (53), the positive phase input end of the first comparison circuit (51) is used for detecting an input actual voltage, the negative phase input end of the first comparison circuit (51) is used for inputting a first reference voltage, the second comparison circuit (52) is coupled with the second relay control circuit (54), the first relay control circuit (53) is coupled with a rectification circuit and used for switching the series-parallel connection of a first rectifier bridge B1 and a second rectifier bridge B2 according to a level signal output by the first comparison circuit (51), the second relay control circuit (54) is coupled with the transformation circuit (3) and used for connecting a second primary sub-coil with a first primary coil in series at an output positive level of the second comparison circuit (52), the non-inverting input terminal of the second comparison circuit (52) is used for detecting the input actual voltage, and the inverting input terminal is used for inputting a second reference voltage.
6. The system of the global flux welder circuit selection method according to claim 5, wherein: the control circuit module (6) comprises a first locking circuit (61) and a second locking circuit (62), wherein the first locking circuit (61) is coupled to the first comparison circuit (51), the second locking circuit (62) is coupled to the second comparison circuit (52), the first locking circuit (61) is used for keeping a level signal output by the first comparison circuit (51) after an actual voltage value drops below a first reference voltage, and the second locking circuit (62) is used for keeping a level signal output by the second comparison circuit (52) after the actual voltage value drops below a second reference voltage.
7. The system of the global flux welder circuit selection method according to claim 6, wherein: the power supply driving control circuit (12) used for controlling the on-off of the filter inverter circuit (2) is coupled to the filter inverter circuit (2), the first time delay circuit (9) used for controlling the self-delay first standard time to start is coupled to the power supply driving control circuit (12), the second time delay circuit (8) used for controlling the self-delay second standard time to start is coupled to the input rectification circuit (1), the third time delay circuit (10) used for controlling the self-delay third standard time to start is coupled to the first relay control circuit (53), the fourth time delay circuit (11) used for controlling the self-delay fourth standard time to start is coupled to the second relay control circuit (54), and the duration of the first standard time, the duration of the second standard time, the duration of the fourth standard time and the duration of the third standard time sequentially decrease in sequence.
8. The system of the global flux welder circuit selection method according to claim 5, wherein: and an indicating circuit (15) for indicating the on-off of the first relay control circuit (53) is coupled to the first comparison circuit (51).
CN202210017799.XA 2022-01-07 2022-01-07 Global general welding machine circuit selection method and system Active CN114226920B (en)

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