CN201361758Y - Output external characteristic control circuit of inverter welding machine - Google Patents
Output external characteristic control circuit of inverter welding machine Download PDFInfo
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- CN201361758Y CN201361758Y CNU2009201367506U CN200920136750U CN201361758Y CN 201361758 Y CN201361758 Y CN 201361758Y CN U2009201367506 U CNU2009201367506 U CN U2009201367506U CN 200920136750 U CN200920136750 U CN 200920136750U CN 201361758 Y CN201361758 Y CN 201361758Y
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Abstract
The utility model discloses an output external characteristic control circuit of an inverter welding machine, which is connected among a welding machine, a wire feeding motor and a pulse width modulation module; the output external characteristic control circuit comprises a constant voltage circuit and a differential circuit, wherein the constant voltage circuit comprises a first operational amplifier, a reverse input end of which is connected with the welding machine by a sampling resistor R7 so as to sample voltage signals output by the welding machine; the reverse input end of the first operational amplifier is connected with the wire feeding motor by a sampling resistor R6 so as to sample and speed voltage feedback signals output by the wire feeding motor; constant voltage signals are output by an output end of the first operational amplifier; an input end of the differential circuit is connected with the output end of the first operational amplifier so as to conduct differentiation to the constant voltage signals, and an output end of the differential circuit is connected with the pulse width modulation module. The output external characteristic control circuit has similar constant voltage output external characteristic and single knob adjusting function.
Description
Technical field
The control circuit that the utility model relates to a kind of output external characteristic of inverter type welder and has the collaborative regulatory function of single knob.
Background technology
The output external characteristic control circuit of explaining in words the system inverter type welder with regard to gas shielded arc welding (MIG) only has independent constant voltage function, but gas shielded arc welding must satisfy burn-off rate equals speed of welding, therefore have following deficiency: 1, the inverter type welder of this control circuit coupling regulation voltage output separately, the debugging welding conditions need be carried out repeatedly; 2, must match each other adjusting to select its proper fit value with wire feed rate, adjusting need be carried out repeatedly; 3, welding machine can't be with the maximum short circuit current state of devoting oneself to work, and its arcing initiation success rate utmost point is lower.
The utility model content
The control circuit that the utility model provides a kind of output external characteristic of inverter type welder and has the collaborative regulatory function of single knob, it has overcome the deficiency of the existing single adjusting welding machine voltage of output external characteristic control circuit of traditional inverter type welder.
The technical scheme that its technical problem that solves the utility model adopts is:
A kind of control circuit of output external characteristic of inverter type welder, it is connected between welding machine, wire feeding motor and the pulse width modulation module, and this output external characteristic control circuit comprises:
One constant voltage circuit, it comprises one first operational amplifier, the reverse input end of this first operational amplifier connects welding machine with sampling welding machine output voltage signal through sampling resistor R7, connect wire feeding motor with sampling wire feeding motor velocity voltage feedback signal through sampling resistor R6, the output output constant voltage signal of this first operational amplifier; And
One differential circuit, its input connect the output of first operational amplifier with differential constant voltage signal, and its output connects pulse width modulation module.
In the utility model one preferred embodiment, this control circuit also comprises feedback resistance circuit, and it connects the reverse input end and the output of first operational amplifier.
In the utility model one preferred embodiment, this feedback resistance circuit comprises that one can regulate the adjusting resistance of resistance value size.
In the utility model one preferred embodiment, this control circuit also comprises capacitor C 5, and it connects the reverse input end and the output of first operational amplifier.
In the utility model one preferred embodiment, the in-phase input end of this first operational amplifier is connected with a diode D1 who shields through a balance resistance ground connection between the in-phase input end of this first operational amplifier and the reverse input end.
In the utility model one preferred embodiment, the output of this first operational amplifier is through capacitor C 4 ground connection.
In the utility model one preferred embodiment, this differential circuit comprises one second operational amplifier, the reverse input end of this second operational amplifier connects the output of first operational amplifier through resistance R 2, the in-phase input end of this second operational amplifier connects constant pressure source through resistance R 13, this second operational amplifier output terminal connects diode D2 positive pole, connects a bandwidth-limited circuit between the in-phase input end of this diode D2 negative pole and second operational amplifier.
In the utility model one preferred embodiment, connect a resistance R 8 between the output of this second operational amplifier and the reverse input end, connect a capacitor C 6 between the output of this second operational amplifier and the reverse input end.
In the utility model one preferred embodiment, this bandwidth-limited circuit comprises the parallel circuit that a resistance R 1, a capacitor C 1 and are made up of resistance R 14 and capacitor C 10, this resistance R 1 first end connects diode D2 negative pole, this capacitor C 1 first end connects resistance R 1 second end, this parallel circuit first end connects capacitor C 1 second end and ground connection, and this parallel circuit second end connects the in-phase input end of second operational amplifier; Second end of this resistance R 1 connects pulse width modulation module.
In the utility model one preferred embodiment, be connected with a series circuit of forming by resistance R 3 and capacitor C 2 between second end of this resistance R 1 and the reverse input end of second operational amplifier.
The technical program is compared with background technology: this control circuit has the defeated and collaborative regulatory function of single knob of constant voltage external characteristics, therefore has following advantage: the scope of application that 1, improves inverter type welder greatly, almost can be used for controlling the inverter type welder that wide variety of applications SG3525 does pulse width modulation controlled, to realize output constant voltage external characteristics; 2, when the constant voltage external characteristics is exported, with the maximum short circuit current state of devoting oneself to work, its arcing initiation success rate is high all the time for welding machine in the MIG welding arc process.Because this feedback resistance circuit comprises that one can regulate the adjusting resistance of resistance value size, therefore has single knob regulatory function, as long as regulate the voltage sample value also thereupon variation of wire feed rate by the wire feeding motor feedback, thereby the voltage feedback quantity behind differential also changes, just can realize single knob welding current adjusting as long as mix up arc length voltage in advance, realize that weldingvoltage regulates from the motion tracking wire feed rate, make that satisfying wire feed rate equals burn-off rate all the time and realized that single knob regulates.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 has illustrated the circuit diagram of degreeization of the inverter type welder of a preferred embodiment.
The specific embodiment
Please refer to Fig. 1, a kind of output external characteristic control circuit of inverter type welder, it is connected between the control pin 9 of welding machine, wire feeding motor and pulse width modulation module SG3525.This output external characteristic control circuit comprises a constant voltage circuit 10 and a differential circuit 20.
This constant voltage circuit 10, it comprises one first operational amplifier ICIA, a resistance R 7, a resistance R 6, a resistance R 5, a resistance R RP1, a resistance R 9, a resistance R 10, a capacitor C 5, a capacitor C 4 and a diode D1.
The reverse input end of this first operational amplifier ICIA connects the output negative pole of welding machine with sampling welding machine output voltage signal through sampling resistor R7, connect the wire feeding motor positive pole with sampling wire feeding motor velocity voltage feedback signal through sampling resistor R6.The in-phase input end of this first operational amplifier ICIA is through a balance resistance R10 ground connection, for holding circuit, also connects diode D1 between the in-phase input end of this first operational amplifier ICIA and reverse input end.This first operational amplifier ICIA is operated in the saturation region, the output of this first operational amplifier ICIA output constant voltage signal, in order to guarantee constant voltage, at the output of this first operational amplifier ICIA through capacitor C 4 ground connection.
This resistance R 5, resistance R RP1 and resistance R 9 are formed feedback resistance circuit, and it connects reverse input end and the output of the first operational amplifier ICIA.Wherein, resistance R RP1 be for can regulate the adjusting resistance of resistance value size, makes can be regulated by RP1 in the circuit to obtain voltage compensation, can realize the arc length fine setting of MIG weldering.
This capacitor C 5 connects reverse input end and the output of the first operational amplifier ICIA.
This differential circuit 20 comprises one second operational amplifier ICIB, a resistance R 2, a resistance R 3, a resistance R 8, a resistance R 1, a resistance R 13, a resistance R 14, a capacitor C 1, a capacitor C 6, a capacitor C 10 and a diode D2.
The reverse input end of this second operational amplifier ICIB is through the output of the resistance R 2 connections first operational amplifier ICIA, and the in-phase input end of this second operational amplifier ICIB meets constant pressure source+12V through resistance R 13.This second operational amplifier ICIB output connects diode D2 positive pole, connects a bandwidth-limited circuit between the in-phase input end of this diode D2 negative pole and the second operational amplifier ICIB.This bandwidth-limited circuit comprises the parallel circuit that a resistance R 1, a capacitor C 1 and are made up of resistance R 14 and capacitor C 10, this resistance R 1 first end connects diode D2 negative pole, this capacitor C 1 first end connects resistance R 1 second end, this parallel circuit first end connects capacitor C 1 second end and ground connection, and this parallel circuit second end connects the in-phase input end of second operational amplifier; Second end of this resistance R 1 connects the control pin 9 of pulse width modulation module SG3525.
Connect a resistance R 8 between the output of this second operational amplifier ICIB and the reverse input end, connect a capacitor C 6 between the output of this second operational amplifier ICIB and the reverse input end.
Be connected with a series circuit of forming by resistance R 3 and capacitor C 2 between second end of this resistance R 1 and the reverse input end of the second operational amplifier ICIB.
Above-mentioned constant voltage circuit 10 can become double operational module LM358 with differential circuit 20.
The above, it only is the utility model preferred embodiment, so can not limit the scope that the utility model is implemented with this, i.e. the equivalence of doing according to the utility model claim and description changes and modifies, and all should still belong in the scope that the utility model patent contains.
Claims (10)
1. the output external characteristic control circuit of an inverter type welder, it is connected between welding machine, wire feeding motor and the pulse width modulation module, it is characterized in that: this output external characteristic control circuit comprises:
One constant voltage circuit, it comprises one first operational amplifier, the reverse input end of this first operational amplifier connects welding machine with sampling welding machine output voltage signal through sampling resistor R7, connect wire feeding motor with sampling wire feeding motor velocity voltage feedback signal through sampling resistor R6, the output output constant voltage signal of this first operational amplifier; And
One differential circuit, its input connect the output of first operational amplifier with differential constant voltage signal, and its output connects pulse width modulation module.
2. the output external characteristic control circuit of a kind of inverter type welder according to claim 1, it is characterized in that: this constant voltage circuit also comprises feedback resistance circuit, it connects the reverse input end and the output of first operational amplifier.
3. the output external characteristic control circuit of a kind of inverter type welder according to claim 2, it is characterized in that: this feedback resistance circuit comprises that one can regulate the adjusting resistance of resistance value size.
4. the output external characteristic control circuit of a kind of inverter type welder according to claim 1, it is characterized in that: this constant voltage circuit also comprises capacitor C 5, it connects the reverse input end and the output of first operational amplifier.
5. the output external characteristic control circuit of a kind of inverter type welder according to claim 1; it is characterized in that: the in-phase input end of this first operational amplifier is connected with a diode D1 who shields through a balance resistance ground connection between the in-phase input end of this first operational amplifier and the reverse input end.
6. the output external characteristic control circuit of a kind of inverter type welder according to claim 1, it is characterized in that: the output of this first operational amplifier is through capacitor C 4 ground connection.
7. the output external characteristic control circuit of a kind of inverter type welder according to claim 1, it is characterized in that: this differential circuit comprises one second operational amplifier, the reverse input end of this second operational amplifier connects the output of first operational amplifier through resistance R 2, the in-phase input end of this second operational amplifier connects constant pressure source through resistance R 13, this second operational amplifier output terminal connects diode D2 positive pole, connects a bandwidth-limited circuit between the in-phase input end of this diode D2 negative pole and second operational amplifier.
8. the output external characteristic control circuit of a kind of inverter type welder according to claim 7, it is characterized in that: connect a resistance R 8 between the output of this second operational amplifier and the reverse input end, connect a capacitor C 6 between the output of this second operational amplifier and the reverse input end.
9. the output external characteristic control circuit of a kind of inverter type welder according to claim 8, it is characterized in that: this bandwidth-limited circuit comprises the parallel circuit that a resistance R 1, a capacitor C 1 and are made up of resistance R 14 and capacitor C 10, this resistance R 1 first end connects diode D2 negative pole, this capacitor C 1 first end connects resistance R 1 second end, this parallel circuit first end connects capacitor C 1 second end and ground connection, and this parallel circuit second end connects the in-phase input end of second operational amplifier; Second end of this resistance R 1 connects pulse width modulation module.
10. the output external characteristic control circuit of a kind of inverter type welder according to claim 9 is characterized in that: be connected with a series circuit of forming by resistance R 3 and capacitor C 2 between second end of this resistance R 1 and the reverse input end of second operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201367506U CN201361758Y (en) | 2009-02-13 | 2009-02-13 | Output external characteristic control circuit of inverter welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201367506U CN201361758Y (en) | 2009-02-13 | 2009-02-13 | Output external characteristic control circuit of inverter welding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201361758Y true CN201361758Y (en) | 2009-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009201367506U Expired - Fee Related CN201361758Y (en) | 2009-02-13 | 2009-02-13 | Output external characteristic control circuit of inverter welding machine |
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| CN (1) | CN201361758Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103722276A (en) * | 2013-12-27 | 2014-04-16 | 上海沪工焊接集团股份有限公司 | Peak current feedback circuit used for inverter welding machine |
| CN106170171A (en) * | 2016-08-30 | 2016-11-30 | 中广核达胜加速器技术有限公司 | A kind of wide scope, in high precision, microbeam stream regulation circuit |
-
2009
- 2009-02-13 CN CNU2009201367506U patent/CN201361758Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103722276A (en) * | 2013-12-27 | 2014-04-16 | 上海沪工焊接集团股份有限公司 | Peak current feedback circuit used for inverter welding machine |
| CN103722276B (en) * | 2013-12-27 | 2016-08-17 | 上海沪工焊接集团股份有限公司 | A kind of inverter type welder peak point current feedback circuit |
| CN106170171A (en) * | 2016-08-30 | 2016-11-30 | 中广核达胜加速器技术有限公司 | A kind of wide scope, in high precision, microbeam stream regulation circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091216 Termination date: 20140213 |