CN103170710A - Multifunctional digital consumable electrode electric welding machine - Google Patents
Multifunctional digital consumable electrode electric welding machine Download PDFInfo
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- CN103170710A CN103170710A CN2013101030669A CN201310103066A CN103170710A CN 103170710 A CN103170710 A CN 103170710A CN 2013101030669 A CN2013101030669 A CN 2013101030669A CN 201310103066 A CN201310103066 A CN 201310103066A CN 103170710 A CN103170710 A CN 103170710A
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Abstract
The invention provides a multifunctional digital consumable electrode electric welding machine. The multifunctional digital consumable electrode electric welding machine is characterized by comprising a main circuit, a control circuit and a power supply voltage transformation circuit. The main circuit comprises an electro-magnetic interference (EMI) anti-interference circuit, an input rectifying circuit, a soft switching inverter circuit, an output transformer, an output rectifying circuit and an electric welding machine output end, wherein the EMI anti-interference circuit, the input rectifying circuit, the soft switching inverter circuit, the output transformer, the output rectifying circuit and the electric welding machine output end are in electrical connection in sequence. The control circuit comprises a sampling circuit, a welding parameter setting module, a digital control circuit and a soft switching driving circuit. The sampling circuit is connected with the electric welding machine output end and is used for collecting the voltage and current signals output by the electric welding machine. The welding parameter setting module is used for setting the welding parameter value. The sampling circuit is connected with the welding parameter setting module through the digital control circuit, and the digital control circuit receives and processes the voltage and the current signals which are output by the electric welding machine and collected by the sampling circuit and the welding parameter value set by the welding parameter setting module and outputs and generates welding control signals. The digital control circuit is connected with the soft switching inverter circuit through the soft switching driving circuit. The multifunctional digital consumable electrode electric welding machine is high in welding precision and stable in performance.
Description
Technical field
The present invention relates to a kind of electric welding machine, especially a kind of power supply of electric welding machine.
Background technology
Traditional welding machine electric power is all generally to feed back to control power supply with analogue technique by curtage, this mode is used in general welding manner (manual welding, argon arc welding and plasma cutting etc.), generally can satisfy welding requirements, but just controlling in the higher mode of some welding requirements (efficient consumable electrode welding) with general analogue technique is not very desirable, is mainly that control accuracy can not satisfy welding requirements.In traditional welding machine electric power, main line is all generally to adopt hard switching inversion transformation technique, the large fragile poor reliability of the loss of this mode power device.The protection of the power device in traditional welding machine electric power is also done perfectly not.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art; a kind of multifunctional digital consumable electrode electric welding machine is provided; strengthened the overcurrent protection measure; adopt high-precision current sensor and in conjunction with digital microcontroller, output voltage and the output current of feedback controlled, having optimized the driving logic of switching inverter circuit.The technical solution used in the present invention is:
A kind of multifunctional digital consumable electrode electric welding machine comprises main line, control circuit, power supply transformation circuit;
Described main line comprises EMI anti-clutter circuit, input rectification circuit, soft switching inverting circuit, output transformer, output rectification circuit and the electric welding machine output that is electrically connected to successively;
Described control circuit comprises:
The sample circuit that connects the electric welding machine output gathers the voltage and current signal that electric welding machine is exported;
The welding parameter setting module is used for setting the welding parameter value;
The digital control circuit that connects sample circuit and welding parameter setting module, receive and process electric welding machine output voltage and current signal that sample circuit gathers, receive and process the welding parameter value that the welding parameter setting module sets, output produces the welding control signal;
The soft switch driving circuit of linking number word control circuit and soft switching inverting circuit is accepted the control of the welding control signal of digital control circuit output, produces drive clock signal and pass to soft switching inverting circuit; Driving clock signal makes the power device IGBT pipe in soft switching inverting circuit be operated under " soft switch " pattern.
The input of described power supply transformation circuit connects the output of EMI anti-clutter circuit, and the output of power supply transformation circuit connects respectively described soft switch driving circuit, welding parameter setting module, digital control circuit; Power supply transformation circuit provides working power to the module in described control circuit or circuit.
Preferably, described soft switching inverting circuit is provided with current protector W1 in its output loop, and the output of current protector W1 connects soft switch driving circuit; Current protector W1 gathers the output current of soft switching inverting circuit; pass to soft switch driving circuit; so that soft switch driving circuit produces guard signal at the output current of soft switching inverting circuit during greater than setting threshold, to turn-off the IGBT pipe in soft switching inverting circuit.
Preferably, the welding expert module that also comprises a linking number word control circuit in described control circuit; The welding expert module is built-in with the welding cell that obtains by a large amount of soldering tests, and the welding cell that also has welding expert both domestic and external to provide can provide for digital control circuit the contrast of welding parameter.
Advantage of the present invention: adopt novel single-chip microcomputer STM32F103 to tap into capable accurate Calculation and to recently controlling main line, the stability of welding arc is significantly improved by high-precision electric current and Voltage Feedback butt welding.Main line adopts the digital soft switch technology, has reduced the switching loss of power device.Use novel power device IGBT, make the loss of complete machine significantly reduce and improve reliability.Strengthened the protection to power device IGBT.
Description of drawings
Fig. 1 is logic diagram of circuit of the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
Fig. 3 is driving clock signal schematic diagram of the present invention.
The specific embodiment
The invention will be further described below in conjunction with concrete drawings and Examples.
As shown in Figure 1:
A kind of multifunctional digital consumable electrode electric welding machine comprises main line, control circuit, power supply transformation circuit 11;
Described main line comprises EMI anti-clutter circuit 1, input rectification circuit 2, soft switching inverting circuit 3, output transformer 4, output rectification circuit 5 and the electric welding machine output that is electrically connected to successively;
Described control circuit comprises:
The sample circuit 6 that connects the electric welding machine output gathers the voltage and current signal that electric welding machine is exported;
Welding parameter setting module 8 is used for setting the welding parameter value;
The digital control circuit 7 that connects sample circuit 6 and welding parameter setting module 8, receive and process electric welding machine output voltage and current signal that sample circuit 6 gathers, receive and process the welding parameter value that welding parameter setting module 8 sets, output produces the welding control signal;
The soft switch driving circuit 10 of linking number word control circuit 7 and soft switching inverting circuit 3 is accepted the control of the welding control signal of digital control circuit 7 outputs, produces drive clock signal and pass to soft switching inverting circuit 3;
The input of described power supply transformation circuit 11 connects the output of EMI anti-clutter circuit 1, and the output of power supply transformation circuit 11 connects respectively described soft switch driving circuit 10, welding parameter setting module 8, digital control circuit 7; Power supply transformation circuit 11 provides working power to the module in described control circuit or circuit.
Preferably, described soft switching inverting circuit 3 is provided with current protector W1 in its output loop, and the output of current protector W1 connects soft switch driving circuit 10; Current protector W1 gathers the output current of soft switching inverting circuit 3; pass to soft switch driving circuit 10; so that soft switch driving circuit 10 produces guard signal at the output current of soft switching inverting circuit 3 during greater than setting threshold, to turn-off the IGBT pipe in soft switching inverting circuit 3.
Preferably, the welding expert module 9 that also comprises a linking number word control circuit 7 in described control circuit; Welding expert module 9 is built-in with the welding cell that obtains by a large amount of soldering tests, and the welding cell that also has welding expert both domestic and external to provide can provide for digital control circuit 7 contrast of welding parameter.
Circuit theory of the present invention after industrial-frequency alternating current is inputted this electric welding machine, at first enters EMI anti-clutter circuit 1 as shown in Figure 2, and EMI anti-clutter circuit 1 is comprised of a series of filter inductance and filter capacitor, effectively the interference in the filtering electrical network.
What the rear one-level of EMI anti-clutter circuit 1 connected is input rectification circuit 2, and described input rectification circuit 2 comprises rectifier bridge QL1, filter capacitor C1, C2, C3; Filter capacitor C1 is connected in parallel on two outputs of rectifier bridge QL1, is connected in parallel on two outputs of rectifier bridge QL1 after filter capacitor C2 and C3 series connection again; The connected node ground connection of filter capacitor C2 and C3.Input rectification circuit 2 provides direct current for next stage soft switching inverting circuit 3.
What the rear one-level of input rectification circuit 2 connected is soft switching inverting circuit 3, described soft switching inverting circuit 3 mainly is comprised of IGBT pipe Q1, Q2, Q3, Q4, and each IGBT manages in the IGBT(Fig. 2 that all adopts built-in damper diode and do not draw built-in damper diode).IGBT pipe Q1 is connected colelctor electrode and is linked together and connect the positive output end of input rectification circuit 2 with Q2, IGBT pipe Q3 is connected emitter stage and is linked together and connect the negative output terminal of input rectification circuit 2 with Q4; The emitter stage of IGBT pipe Q2 is connected with the colelctor electrode of IGBT pipe Q4, and as the first output of soft switching inverting circuit 3, the emitter stage of IGBT pipe Q1 is connected with the colelctor electrode of IGBT pipe Q3, as the second output of soft switching inverting circuit 3; Each grid of IGBT pipe Q1, Q2, Q3, Q4 and emitter stage connect respectively the output of soft switch driving circuit 10, accept the driving clock signal that soft switch driving circuit 10 is exported;
Described output transformer 4 comprises elementary L10, with tapped secondary L11, L12 and L13; The first output of above-mentioned soft switching inverting circuit 3 connects the end of output transformer 4 elementary L10, the other end of L10 connects current protector W1 by capacitor C 4, current protector W1 connects the second output of soft switching inverting circuit 3, has formed the output loop of soft switching inverting circuit 3; This output transformer 4 adopts a plurality of secondary parallel connections, can effectively increase output current.
Current protector W1 gathers the output current of soft switching inverting circuit 3; pass to soft switch driving circuit 10; so that soft switch driving circuit 10 produces guard signal when the output current of soft switching inverting circuit 3 is excessive; with timely shutoff IGBT pipe Q1, Q2, Q3, Q4, prevent that IGBT pipe Q1, Q2, Q3, Q4 from damaging.
Described output rectification circuit 5 comprises resistance R 11, R12, R13, capacitor C 11, C12, C13, commutation diode D1, D2, D3, D4, D5, D6, inductance L 14; Be connected in parallel on again the two ends of 4 level L11 of output transformer after resistance R 11 and capacitor C 11 series connection, be connected in parallel on again the two ends of 4 level L12 of output transformer after resistance R 12 and capacitor C 12 series connection, be connected in parallel on again the two ends of 4 level L13 of output transformer after resistance R 13 and capacitor C 13 series connection; Output transformer 4 level L11, L12, L13 centre tap separately link together, and are connected with an end of inductance L 14; Commutation diode D1, D2, D3 anode separately is connected with the end of L11, the end of L12, the end of L13 respectively, and commutation diode D4, D5, D6 anode separately is connected with the other end of L11, the other end of L12, the other end of L13 respectively; Commutation diode D1, D2, D3, D4, D5, D6 negative electrode separately links together and connects with the positive output end of electric welding machine.
Described sample circuit 6 comprises the voltage sample circuit, and its positive output end and negative output terminal with electric welding machine is connected to respectively described digital control circuit 7, and the voltage sample circuit gathers the voltage signal of electric welding machine output, and feeds back to digital control circuit 7; Described sample circuit 6 also comprises a current sensor W2, current sensor W2 is serially connected between the negative output terminal of the other end of described inductance L 14 and electric welding machine, the output of current sensor W2 connects described digital control circuit 7, current sensor W2 gathers the current signal of electric welding machine output, and feeds back to digital control circuit 7.Current sensor W2 has selected the LAH100-P of lime company, and its precision is high, good stability.
Described welding parameter setting module 8 mainly is comprised of single-chip microcomputer U2, is used for setting the welding parameter value; The present embodiment single-chip microcomputer U2 adopts STC12C5A60AD, and various welding (aluminium, stainless steel, carbon steel can be set, copper) detail parameters mainly comprises welding current, weldingvoltage, pulse frequency, receive arc current, receive arc voltage etc., the preset value of various welding parameters is provided for digital control circuit 7.
Described welding expert module 9 mainly is comprised of single-chip microcomputer U3, and the present embodiment single-chip microcomputer U3 adopts STC12C5A60S2.Welding expert module 9 is built-in with the welding cell that obtains by a large amount of soldering tests, and the welding cell that also has welding expert both domestic and external to provide can provide for digital control circuit 7 contrast of welding parameter.
Described digital control circuit 7 mainly is comprised of single-chip microcomputer U1, the present embodiment single-chip microcomputer U1 adopts the STM32F103 of ST Microelectronics, digital control circuit 7 is processed static welding parameter and the dynamic welding parameter that obtains, best welding control signal is provided for soft switch driving circuit 10, make electric welding machine be operated in best situation, guaranteed moulding and the quality of various welding.Described static welding parameter comprises welding parameter value that welding parameter setting module 8 sets, call the welding parameter in the welding cell that welding expert module 9 provides.Electric welding machine output voltage and current signal that the sample circuit 6 that described dynamic welding parameter refers to receive gathers.
Described soft switch driving circuit 10 is mainly by the CPLD(CPLD) form, the control that it accepts the welding control signal of digital control circuit 7 outputs produces the driving clock signal and passes to soft switching inverting circuit 3.Owing to having adopted the soft switch driving circuit 10 of ripe CPLD, significantly reduce the usage quantity of device in circuit, reduce the usable floor area of circuit board, shortened the line length of wiring board, so significantly reduce the trouble point of wiring board, strengthen the antijamming capability of wiring board, improved the reliability of wiring board, can control accurately the switching sequence of IGBT pipe.
Drive clock signal as shown in Figure 3, drive voltage drive signals S1, S2, S3, S4 that clock signal comprises four tunnel same period, in one-period, the positive pulse of S1 and S4 originates in synchronization, the positive pulse width of S4 is greater than the positive pulse width of S1, after the positive pulse of S4 stops, interval one Dead Time, the positive pulse of S3 and S2 originates in synchronization, the positive pulse width of S3 and S1 is equal, and the positive pulse width of S2 and S4 equates, after the positive pulse of S2 stops, interval one Dead Time, just begin next cycle again.
Four tunnel voltage drive signals S1, S2, S3, S4 are added to respectively grid and the emitter stage of the grid of the grid of the grid of IGBT pipe Q1 and emitter stage, IGBT pipe Q2 and emitter stage, IGBT pipe Q3 and emitter stage, IGBT pipe Q4.The work schedule of IGBT pipe is: 1, and in the time of initial, Q1 and Q4 are open-minded simultaneously, and when turn-offing to Q1, because Q4 still is in conducting state, so the voltage that Q1 bears when shutoff is very little.2, when turn-offing to Q4, because the inner damper diode of IGBT pipe has the afterflow effect, the self induction voltage of having pruned output transformer 4 elementary L10, so the voltage that Q4 bears when turn-offing is also very little.3, turn-off and there is a Dead Time in Q3 between opening at Q4, the voltage of Q2 and Q3 output transformer 4 elementary L10 when opening is almost nil like this.4, then the course of work of Q2 and Q3 is the same with the course of work of Q1 and Q4, after Q2 conducting end, before next cycle, also has a Dead Time between Q2 shutoff and Q1 open.The voltage that whole one-period, four IGBT pipes bear when opening and close is all smaller, thereby can reduce the switching loss of IGBT pipe.
Described power supply transformation circuit 11 comprises transformer TR1 and TR2, obtains industrial-frequency alternating current from the output of EMI anti-clutter circuit 1, supplies with soft switch driving circuit 10, welding parameter setting module 8, digital control circuit 7, welding expert module 9 after step-down.
Claims (9)
1. a multifunctional digital consumable electrode electric welding machine, is characterized in that: comprise main line, control circuit, power supply transformation circuit;
Described main line comprises EMI anti-clutter circuit, input rectification circuit, soft switching inverting circuit, output transformer, output rectification circuit and the electric welding machine output that is electrically connected to successively;
Described control circuit comprises:
The sample circuit that connects the electric welding machine output gathers the voltage and current signal that electric welding machine is exported;
The welding parameter setting module is used for setting the welding parameter value;
The digital control circuit that connects sample circuit and welding parameter setting module, receive and process electric welding machine output voltage and current signal that sample circuit gathers, receive and process the welding parameter value that the welding parameter setting module sets, output produces the welding control signal;
The soft switch driving circuit of linking number word control circuit and soft switching inverting circuit is accepted the control of the welding control signal of digital control circuit output, produces drive clock signal and pass to soft switching inverting circuit;
The input of described power supply transformation circuit connects the output of EMI anti-clutter circuit, and the output of power supply transformation circuit connects respectively described soft switch driving circuit, welding parameter setting module, digital control circuit.
2. multifunctional digital consumable electrode electric welding machine as claimed in claim 1 is characterized in that: described soft switching inverting circuit, be provided with current protector W1 in its output loop, and the output of current protector W1 connects soft switch driving circuit; Current protector W1 gathers the output current of soft switching inverting circuit, passes to soft switch driving circuit, so that soft switch driving circuit produces guard signal during greater than setting threshold at the output current of soft switching inverting circuit.
3. multifunctional digital consumable electrode electric welding machine as claimed in claim 1 or 2, is characterized in that: the welding expert module that also comprises a linking number word control circuit in described control circuit.
4. multifunctional digital consumable electrode electric welding machine as claimed in claim 1 or 2, it is characterized in that: described soft switching inverting circuit mainly is comprised of IGBT pipe Q1, Q2, Q3, Q4, IGBT pipe Q1 is connected colelctor electrode and is linked together and connect the positive output end of input rectification circuit with Q2, IGBT pipe Q3 is connected emitter stage and is linked together and connect the negative output terminal of input rectification circuit with Q4; The emitter stage of IGBT pipe Q2 is connected with the colelctor electrode of IGBT pipe Q4, and as the first output of soft switching inverting circuit, the emitter stage of IGBT pipe Q1 is connected with the colelctor electrode of IGBT pipe Q3, as the second output of soft switching inverting circuit; Each grid of IGBT pipe Q1, Q2, Q3, Q4 and emitter stage connect respectively the output of soft switch driving circuit, accept the driving clock signal that soft switch driving circuit is exported.
5. multifunctional digital consumable electrode electric welding machine as claimed in claim 4, it is characterized in that: the driving clock signal of described soft switch driving circuit output comprises the voltage drive signals S1 of four tunnel same period, S2, S3, S4, in one-period, the positive pulse of S1 and S4 originates in synchronization, the positive pulse width of S4 is greater than the positive pulse width of S1, after the positive pulse of S4 stops, interval one Dead Time, the positive pulse of S3 and S2 originates in synchronization, the positive pulse width of S3 and S1 equates, the positive pulse width of S2 and S4 equates, after the positive pulse of S2 stops, interval one Dead Time again, just begin next cycle, four tunnel voltage drive signals S1, S2, S3, S4 are added to respectively grid and the emitter stage of the grid of the grid of the grid of IGBT pipe Q1 and emitter stage, IGBT pipe Q2 and emitter stage, IGBT pipe Q3 and emitter stage, IGBT pipe Q4.
6. multifunctional digital consumable electrode electric welding machine as claimed in claim 1 or 2, it is characterized in that: described sample circuit comprises the voltage sample circuit, its positive output end and negative output terminal with electric welding machine is connected to respectively described digital control circuit, the voltage sample circuit gathers the voltage signal of electric welding machine output, and feeds back to digital control circuit; Described sample circuit also comprises a current sensor W2, and current sensor W2 gathers the current signal of electric welding machine output, and feeds back to digital control circuit.
7. multifunctional digital consumable electrode electric welding machine as claimed in claim 6, it is characterized in that: described current sensor W2 is the LAH100-P of lime company.
8. multifunctional digital consumable electrode electric welding machine as claimed in claim 1 or 2, it is characterized in that: described digital control circuit mainly is comprised of single-chip microcomputer U1.
9. multifunctional digital consumable electrode electric welding machine as claimed in claim 1 or 2, is characterized in that: a plurality of secondary parallel connections of described output transformer employing.
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Cited By (3)
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| CN103386535A (en) * | 2013-07-12 | 2013-11-13 | 深圳华意隆电气股份有限公司 | Digitized inverter welding machine |
| CN103586564A (en) * | 2013-10-28 | 2014-02-19 | 广东电网公司电力科学研究院 | MIG welding power supply system based on STM32 |
| CN106112245A (en) * | 2016-08-11 | 2016-11-16 | 无锡洲翔成套焊接设备有限公司 | Digital multi mash welder |
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| CN103586564A (en) * | 2013-10-28 | 2014-02-19 | 广东电网公司电力科学研究院 | MIG welding power supply system based on STM32 |
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| CN106112245A (en) * | 2016-08-11 | 2016-11-16 | 无锡洲翔成套焊接设备有限公司 | Digital multi mash welder |
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| CN103170710B (en) | 2015-08-19 |
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