CN103894706A - No-load voltage sampling wire feeding circuit - Google Patents
No-load voltage sampling wire feeding circuit Download PDFInfo
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- CN103894706A CN103894706A CN201410153260.2A CN201410153260A CN103894706A CN 103894706 A CN103894706 A CN 103894706A CN 201410153260 A CN201410153260 A CN 201410153260A CN 103894706 A CN103894706 A CN 103894706A
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- resistance
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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
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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
- B23K9/095—Monitoring or automatic control of welding parameters
-
- 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
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
- B23K9/133—Means for feeding electrodes, e.g. drums, rolls, motors
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Abstract
The invention discloses a no-load voltage sampling wire feeding circuit. The no-load voltage sampling wire feeding circuit comprises a no-load power supply acquiring circuit, a wire feeding voltage comparison circuit, a pulse width modulation circuit, a wire feeding speed setting circuit and a power amplifying output circuit. The no-load power supply acquiring circuit is connected with the wire feeding voltage comparison circuit, the wire feeding voltage comparison circuit is connected with the pulse width modulation circuit and the power amplifying output circuit, and the pulse width modulation circuit is connected with the wire feeding speed setting circuit and the power amplifying output circuit. According to the technical scheme, a power supply is acquired through no-load voltage output by a welding machine and is connected to the pulse width modulation circuit after rectification and filtering, the voltage across a wire feeding machine is acquired and compared with a set working voltage, and accordingly the voltage across the wire feeding machine can be adjusted. By means of the no-load voltage sampling wire feeding circuit, the voltage across the wire feeding machine is stable, the wire feeding speed is uniform and stable, welding performance is stable, and forming quality is good.
Description
Technical field
The present invention relates to source of welding current technical field, particularly relate to a kind of floating voltage sampling wire feeding circuit.
Background technology
Increasingly mature along with inverted gas protective welder power technology, because it is with respect to plurality of advantages such as traditional welding machine volume are little, lightweight and energy-conservation, its scope of application is also more and more wider.Meanwhile, to inverted gas protective welder cost, reliability is also had higher requirement.For inverted gas protective welder, provide burning voltage to wire-feed motor, realize wire feed rate uniform and stable, be to keep a stable important step of welding performance.At present, be that power supply is provided separately to the conventional power supply mode of wire-feed motor, the shortcoming of doing is like this not only to have increased cost, and power supply is unstable.
Summary of the invention
Based on this, be necessary for prior art defect, a kind of floating voltage sampling wire feeding circuit is provided.
Its technical scheme is as follows.
A kind of floating voltage sampling wire feeding circuit, comprise unloaded power supply acquisition cuicuit, wire feed voltage comparator circuit, pulse-width modulation circuit, wire feed rate given circuit, power amplification output circuit, described unloaded power supply acquisition cuicuit connects described wire feed voltage comparator circuit, described wire feed voltage comparator circuit connects described pulse-width modulation circuit and described power amplification output circuit, and described pulse-width modulation circuit connects described wire feed rate given circuit and described power amplification output circuit;
Described unloaded power supply acquisition cuicuit, obtains the power supply of wire-feed motor for the floating voltage of exporting by welding machine;
Described wire feed voltage comparator circuit, for gathering the current voltage at wire-feed motor two ends and feeding back to described pulse-width modulation circuit;
Described pulse-width modulation circuit, for the operating voltage of the current voltage of described wire feed voltage comparator circuit feedback and the setting of described wire feed rate given circuit is compared, and according to comparative result output pulse width modulation waveform;
Described wire feed rate given circuit, sets for the operating voltage to wire-feed motor;
Described power amplification output circuit, for the pulse-width modulation waveform of described pulse-width modulation circuit output is carried out exporting wire-feed motor to after power amplification, provides operating voltage to wire-feed motor.
In an embodiment, also comprise sample rate current control circuit therein, described sample rate current control circuit connects described pulse-width modulation circuit and described power amplification output circuit;
Described sample rate current control circuit, for carrying out current sample and overcurrent protection in the time that wire-feed motor is worked.
In an embodiment, described unloaded power supply acquisition cuicuit comprises the 3rd diode, the first resistance and the first electric capacity therein; Wherein, described the 3rd diode is fast recovery diode, and described the first electric capacity is electrochemical capacitor;
The positive pole of described the 3rd diode connects the inversion rectification cathode output end of welding machine, the negative pole of described the 3rd diode connects one end of described the first resistance, the other end of described the first resistance connects respectively the positive pole of described the first electric capacity and the electrode input end of wire-feed motor, and the negative pole of described the first electric capacity connects inversion rectification cathode output end the ground connection of welding machine.
In an embodiment, described wire feed voltage comparator circuit comprises LM321 operational amplifier, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and the 9th electric capacity therein;
The first pin of described LM321 operational amplifier connects respectively one end of described the 6th resistance and one end of described the 9th resistance, the other end ground connection of described the 9th resistance, the two ends of described the 5th electric capacity connect respectively the two ends of described the 9th resistance, the other end of described the 6th resistance connects respectively one end of described the 4th electric capacity and one end of described the 7th resistance, the other end of described the 7th resistance connects the electrode input end of wire-feed motor, the other end of described the 4th electric capacity connects respectively one end of described the 3rd resistance and one end of described the 4th resistance, the other end of described the 4th resistance connects the negative input of wire-feed motor, the other end of described the 3rd resistance connects respectively one end of tripod and described second resistance of described LM321 operational amplifier, the other end of described the second resistance connects respectively the 4th pin of described LM321 operational amplifier and one end of described the 5th resistance, the two ends of described the second electric capacity connect respectively the two ends of described the second resistance, the other end of described the 5th resistance connects respectively one end of described the 8th resistance and one end of described the 3rd electric capacity, the other end ground connection of described the 3rd electric capacity, the other end of described the 8th resistance connects described pulse-width modulation circuit, the crus secunda ground connection of described LM321 operational amplifier, the 5th pin of described LM321 operational amplifier connects respectively one end of dc source and described the 9th electric capacity, the other end ground connection of described the 9th electric capacity.
In an embodiment, described pulse-width modulation circuit comprises TL494C chip therein; The 18 resistance, the tenth electric capacity, the 13 electric capacity; The first triode, the 3rd triode, the first Zener diode, the 22 resistance, the 25 resistance and the 26 resistance;
The first pin of described TL494C chip connects described wire feed voltage comparator circuit;
The crus secunda of described TL494C chip connects described the tenth one end of electric capacity and one end of described the 13 electric capacity respectively, the other end of described the tenth electric capacity connects one end of described the 18 resistance, the other end of described the 18 resistance connects respectively the tripod of described TL494C chip and the other end of described the 13 electric capacity, and the crus secunda of described TL494C chip also connects described wire feed rate given circuit;
The 9th pin of described TL494C chip connects respectively the tenth pin, one end of described the 26 resistance, the base stage of the base stage of described the first triode and described the 3rd triode, the other end ground connection of described the 26 resistance, the colelctor electrode of described the first triode connects dc source, the emitter stage of described the first triode connects one end of described the 22 resistance, the other end of described the 22 resistance connects respectively one end of described the 25 resistance and the negative pole of described the first Zener diode, the other end of described the 25 resistance connects the emitter stage of described the 3rd triode, the grounded collector of described the 3rd triode, the plus earth of described the first Zener diode, the negative pole of described the first Zener diode also connects described power amplification output circuit.
In an embodiment, described pulse-width modulation circuit also comprises peripheral biasing circuit therein, and described peripheral biasing circuit comprises the tenth resistance, the 12 resistance, the 6th electric capacity, the 7th electric capacity; The 11 resistance, the 8th electric capacity; The 14 resistance, the 11 electric capacity;
One end of described the tenth resistance connects respectively the 14 pin of dc source, described TL494C chip and one end of described the 6th electric capacity, the other end ground connection of described the 6th electric capacity, the other end of described the tenth resistance connects respectively the 4th pin, one end of described the 12 resistance and one end of described the 7th electric capacity of described TL494C chip, the other end ground connection of the other end of described the 12 resistance and described the 7th electric capacity;
One end of described the 11 resistance connects respectively the 12 pin of one end, dc source and the described TL494C chip of described the 8th electric capacity, the other end ground connection of described the 8th electric capacity, the other end of described the 11 resistance connects respectively octal and the 11 pin of described TL494C chip;
One end of described the 14 resistance connects the 6th pin of described TL494C chip, and one end of described the 11 electric capacity connects the 5th pin of described TL494C chip, the equal ground connection of the other end of the other end of described the 14 resistance and described the 11 electric capacity.
Therein in an embodiment, the 7th pin of described TL494C chip and the tenth tripod ground connection.
In an embodiment, described wire feed rate given circuit comprises the 13 resistance, the 15 resistance, the 16 resistance, the 19 resistance, the 20 resistance, the 12 electric capacity, the 5th diode and potentiometer therein;
One end of described the 13 resistance connects dc source, the other end of described the 13 resistance connects a fixed contact of described potentiometer, another fixed contact of described potentiometer connects one end of described the 19 resistance, the other end of described the 19 resistance connects the positive pole of described the 5th diode, the minus earth of described the 5th diode, the movable contact of described potentiometer connects respectively described the 15 one end of resistance and one end of described the 20 resistance, the other end ground connection of described the 20 resistance, the other end of described the 15 resistance connects respectively described the 16 one end of resistance and one end of described the 12 electric capacity, the other end ground connection of described the 12 electric capacity, the other end of described the 16 resistance connects described pulse-width modulation circuit.
In an embodiment, described power amplification output circuit comprises FET, the 17 resistance, the 23 resistance, the 14 electric capacity and the 4th diode therein;
The grid of described FET connects described pulse-width modulation circuit, and the drain electrode of described FET connects sample rate current control circuit, and described sample rate current control circuit for carrying out current sample and overcurrent protection in the time that wire-feed motor is worked; The source electrode of described FET connects respectively one end of anodal and described the 23 resistance of one end of the negative input of wire-feed motor, described the 17 resistance, described the 4th diode, the other end of described the 17 resistance is connected the electrode input end of wire-feed motor with the negative pole of described the 4th diode, the other end of described the 23 resistance connects one end of described the 14 electric capacity, and the other end of described the 14 electric capacity connects the drain electrode of described FET.
In an embodiment, described sample rate current control circuit comprises the 21 resistance, the 24 resistance, the 27 resistance, the 28 resistance, the 29 resistance, the 30 resistance, the 31 resistance, the 32 resistance, the 33 resistance and the 15 electric capacity therein;
One end of described the 21 resistance connects dc source, the other end of described the 21 resistance connects respectively one end of described pulse-width modulation circuit and described the 24 resistance, the other end ground connection of described the 24 resistance, one end of described the 27 resistance connects described pulse-width modulation circuit, the other end of described the 27 resistance connects respectively described the 15 one end of electric capacity and one end of described the 28 resistance, the other end ground connection of described the 15 electric capacity, the other end of described the 28 resistance connects respectively described power amplification output circuit and described the 29 resistance, described the 30 resistance, described the 31 resistance, described the 32 resistance, one end of described the 33 resistance, described the 29 resistance, described the 30 resistance, described the 31 resistance, described the 32 resistance, the equal ground connection of the other end of described the 33 resistance.
Advantage to the technical program or principle describe below.
The floating voltage that the technical program is exported by welding machine obtains power supply, then receives pulse width modulation loop through rectifying and wave-filtering, compares by the operating voltage that gathers wire-feed motor both end voltage and setting, realizes the adjustment to wire-feed motor both end voltage.The invention provides a kind of floating voltage sampling wire feeding circuit, give wire-feed motor burning voltage, realize wire feed rate uniform and stable, make welding performance stable, moulding is better.
Brief description of the drawings
Fig. 1 is the structural representation of floating voltage sampling wire feeding circuit described in the embodiment of the present invention;
Fig. 2 is the circuit diagram of floating voltage sampling wire feeding circuit described in the embodiment of the present invention.
Description of reference numerals:
10, unloaded power supply acquisition cuicuit, 20, wire feed voltage comparator circuit, 30, pulse-width modulation circuit, 40, wire feed rate given circuit, 50, power amplification output circuit.
Detailed description of the invention
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.
Referring to Fig. 1, is the structural representation of floating voltage sampling wire feeding circuit described in the embodiment of the present invention.
A kind of floating voltage sampling wire feeding circuit, comprise unloaded power supply acquisition cuicuit 10, wire feed voltage comparator circuit 20, pulse-width modulation circuit 30, wire feed rate given circuit 40, power amplification output circuit 50, described unloaded power supply acquisition cuicuit 10 connects described wire feed voltage comparator circuit 20, described wire feed voltage comparator circuit 20 connects described pulse-width modulation circuit 30 and described power amplification output circuit 50, and described pulse-width modulation circuit 30 connects described wire feed rate given circuit 40 and described power amplification output circuit 50;
Described unloaded power supply acquisition cuicuit 10, obtains the power supply of wire-feed motor for the floating voltage of exporting by welding machine;
Described wire feed voltage comparator circuit 20, for gathering the current voltage at wire-feed motor two ends and feeding back to described pulse-width modulation circuit;
Described pulse-width modulation circuit 30, for the operating voltage of the current voltage of described wire feed voltage comparator circuit feedback and the setting of described wire feed rate given circuit is compared, and according to comparative result output pulse width modulation waveform;
Described wire feed rate given circuit 40, sets for the operating voltage to wire-feed motor;
Described power amplification output circuit 50, for the pulse-width modulation waveform of described pulse-width modulation circuit output is carried out exporting wire-feed motor to after power amplification, provides operating voltage to wire-feed motor.
Particularly, please consider and examine 2 figure, be the circuit diagram of floating voltage sampling wire feeding circuit described in the embodiment of the present invention.
Described unloaded power supply acquisition cuicuit comprises the 3rd diode D
3, the first resistance R
1with the first capacitor C
1; Wherein, described the 3rd diode D
3for fast recovery diode, described the first capacitor C
1for electrochemical capacitor;
Described the 3rd diode D
3positive pole connect the inversion rectification cathode output end of welding machine, described the 3rd diode D
3negative pole connect described the first resistance R
1one end, described the first resistance R
1the other end connect respectively described the first capacitor C
1positive pole and the electrode input end of wire-feed motor, described the first capacitor C
1negative pole connect inversion rectification cathode output end the ground connection of welding machine.
Obtain power supply by welding machine work output voltage, press arc welding gun switch, produce floating voltage, through fast recovery diode D
3rectification, R
1for current-limiting resistance, electrochemical capacitor C
1more stable power supply is obtained in filtering; Regulate and pulse-width modulation circuit by wire feed rate potentiometer, give wire feed motor M
1burning voltage, realizes wire feed rate uniform and stable.
Described wire feed voltage comparator circuit comprises LM321 operational amplifier, the second resistance R
2, the 3rd resistance R
3, the 4th resistance R
4, the 5th resistance R
5, the 6th resistance R
6, the 7th resistance R
7, the 8th resistance R
8, the 9th resistance R
9, the second capacitor C
2, the 3rd capacitor C
3, the 4th capacitor C
4, the 5th capacitor C
5with the 9th capacitor C
9;
First pin (be also the pin 1 of LM321 operational amplifier in Fig. 2, in Fig. 2, pin 1 to 5 corresponding first pin to the five pin respectively of LM321 operational amplifier, lower same) of described LM321 operational amplifier connects respectively described the 6th resistance R
6one end and described the 9th resistance R
9one end, described the 9th resistance R
9other end ground connection, described the 5th capacitor C
5two ends connect respectively described the 9th resistance R
9two ends, described the 6th resistance R
6the other end connect respectively described the 4th capacitor C
4one end and described the 7th resistance R
7one end, described the 7th resistance R
7the other end connect the electrode input end of wire-feed motor, described the 4th capacitor C
4the other end connect respectively described the 3rd resistance R
3one end and described the 4th resistance R
4one end, described the 4th resistance R
4the other end connect the negative input of wire-feed motor, described the 3rd resistance R
3the other end connect respectively tripod and described second resistance R of described LM321 operational amplifier
2one end, described the second resistance R
2the other end connect respectively the 4th pin and described the 5th resistance R of described LM321 operational amplifier
5one end, described the second capacitor C
2two ends connect respectively described the second resistance R
2two ends, described the 5th resistance R
5the other end connect respectively described the 8th resistance R
8one end and described the 3rd capacitor C
3one end, described the 3rd capacitor C
3other end ground connection, described the 8th resistance R
8the other end connect described pulse-width modulation circuit, the crus secunda ground connection of described LM321 operational amplifier, the 5th pin of described LM321 operational amplifier connects respectively dc source (+15V dc source) and described the 9th capacitor C
9one end, described the 9th capacitor C
9other end ground connection.
The magnitude of voltage at wire feed voltage comparator circuit Real-time Collection wire-feed motor two ends, and the magnitude of voltage of collection is returned to TL494C chip, for comparing with the wire-feed motor operating voltage of setting.
Described pulse-width modulation circuit comprises TL494C chip; The 18 resistance R
18, the tenth capacitor C
10, the 13 capacitor C
13; The first triode Q
1, the 3rd triode Q
3, the first Zener diode Z
1, the 22 resistance R
22, the 25 resistance R
25with the 26 resistance R
26;
First pin (be also the pin 1 of TL494C chip in Fig. 2, in Fig. 2, pin 1 to 16 corresponding first pin to the 16 pin respectively of TL494C chip, lower same) of described TL494C chip connects described wire feed voltage comparator circuit;
The crus secunda of described TL494C chip connects described the tenth capacitor C respectively
10one end and described the 13 capacitor C
13one end, described the tenth capacitor C
10the other end connect described the 18 resistance R
18one end, described the 18 resistance R
18the other end connect respectively tripod and described the 13 capacitor C of described TL494C chip
13the other end, the crus secunda of described TL494C chip also connects described wire feed rate given circuit;
The 9th pin of described TL494C chip connects respectively the tenth pin, described the 26 resistance R
26one end, described the first triode Q
1base stage and described the 3rd triode Q
3base stage, described the 26 resistance R
26other end ground connection, described the first triode Q
1colelctor electrode connect dc source (+15V dc source), described the first triode Q
1emitter stage connect described the 22 resistance R
22one end, described the 22 resistance R
22the other end connect respectively described the 25 resistance R
25one end and described the first Zener diode Z
1negative pole, described the 25 resistance R
25the other end connect described the 3rd triode Q
3emitter stage, described the 3rd triode Q
3grounded collector, described the first Zener diode Z
1plus earth, described the first Zener diode Z
1negative pole also connect described power amplification output circuit.
The 1st pin of described TL494C chip receives the wire-feed motor current voltage value from wire feed voltage comparator circuit feedback, and the 2nd pin receives the setting operating voltage from wire feed rate initialization circuit, and in chip, carries out computing comparison.According to comparative result, for example, by the 9th pin and the 10th pin output pulse width modulation signal (pwm control signal).
Described pulse-width modulation circuit also comprises peripheral biasing circuit, and described peripheral biasing circuit comprises the tenth resistance R
10, the 12 resistance R
12, the 6th capacitor C
6, the 7th capacitor C
7; The 11 resistance R
11, the 8th capacitor C
8; The 14 resistance R
14, the 11 capacitor C
11;
Described the tenth resistance R
10one end connect respectively dc source (V
refdc source), the 14 pin and described the 6th capacitor C of described TL494C chip
6one end, described the 6th capacitor C
6other end ground connection, described the tenth resistance R
10the other end connect respectively the 4th pin of described TL494C chip, described the 12 resistance R
12one end and described the 7th capacitor C
7one end, described the 12 resistance R
12the other end and described the 7th capacitor C
7other end ground connection;
Described the 11 resistance R
11one end connect respectively described the 8th capacitor C
8the 12 pin of one end, dc source (+15V dc source) and described TL494C chip, described the 8th capacitor C
8other end ground connection, described the 11 resistance R
11the other end connect respectively octal and the 11 pin of described TL494C chip;
Described the 14 resistance R
14one end connect the 6th pin of described TL494C chip, described the 11 capacitor C
11one end connect the 5th pin of described TL494C chip, described the 14 resistance R
14the other end and described the 11 capacitor C
11the equal ground connection of the other end.
The 7th pin of described TL494C chip and the tenth tripod ground connection.
Peripheral biasing circuit provides the normal operation circumstances of chip, ensures that chip can steady operation.
Described wire feed rate given circuit comprises the 13 resistance R
13, the 15 resistance R
15, the 16 resistance R
16, the 19 resistance R
19, the 20 resistance R
20, the 12 capacitor C
12, the 5th diode D
5and potentiometer (speed regulator potentiometer);
Described the 13 resistance R
13one end connect dc source (V
refdc source), described the 13 resistance R
13the other end connect a fixed contact of described potentiometer, another fixed contact of described potentiometer connects described the 19 resistance R
19one end, described the 19 resistance R
19the other end connect described the 5th diode D
5positive pole, described the 5th diode D
5minus earth, the movable contact of described potentiometer connects respectively described the 15 resistance R
15one end and described the 20 resistance R
20one end, described the 20 resistance R
20other end ground connection, described the 15 resistance R
15the other end connect respectively described the 16 resistance R
16one end and described the 12 capacitor C
12one end, described the 12 capacitor C
12other end ground connection, described the 16 resistance R
16the other end connect described pulse-width modulation circuit.
Negotiation speed regulator potentiometer can be set the operating voltage of wire-feed motor, and then sets the wire feed rate of wire-feed motor.
Described power amplification output circuit comprises FET Q
2, the 17 resistance R
17, the 23 resistance R
23, the 14 capacitor C
14with the 4th diode D
4;
Described FET Q
2grid connect described pulse-width modulation circuit, described FET Q
2drain electrode connect sample rate current control circuit, described sample rate current control circuit for carrying out current sample and overcurrent protection in the time that wire-feed motor is worked; Described FET Q
2source electrode connect respectively the negative input of wire-feed motor, described the 17 resistance R
17one end, described the 4th diode D
4positive pole and described the 23 resistance R
23one end, described the 17 resistance R
17the other end and described the 4th diode D
4negative pole connect the electrode input end of wire-feed motor, described the 23 resistance R
23the other end connect described the 14 capacitor C
14one end, described the 14 capacitor C
14the other end connect described FET Q
2drain electrode.
The pulse-width signal of pulse-width modulation circuit output, drives FET Q
2work, exports corresponding burning voltage to wire feed motor M
1work.Resistance R
23and capacitor C
14for FET Q
2rC absorbing circuit, R
17for load resistance and wire feeding motor parallel connection, diode D
4for clamper work, realize wire-feed motor speed uniform and stable, thereby make that welding performance is stable, moulding is better.
Also comprise sample rate current control circuit, described sample rate current control circuit connects described pulse-width modulation circuit and described power amplification output circuit;
Described sample rate current control circuit, for carrying out current sample and overcurrent protection in the time that wire-feed motor is worked.
Described sample rate current control circuit comprises the 21 resistance R
21, the 24 resistance R
24, the 27 resistance R
27, the 28 resistance R
28, the 29 resistance R
29, the 30 resistance R
30, the 31 resistance R
31, the 32 resistance R
32, the 33 resistance R
33with the 15 capacitor C
15;
Described the 21 resistance R
21one end connect dc source (V
refdc source), described the 21 resistance R
21the other end connect respectively described pulse-width modulation circuit and described the 24 resistance R
24one end, described the 24 resistance R
24other end ground connection, described the 27 resistance R
27one end connect described pulse-width modulation circuit, described the 27 resistance R
27the other end connect respectively described the 15 capacitor C
15one end and described the 28 resistance R
28one end, described the 15 capacitor C
15other end ground connection, described the 28 resistance R
28the other end connect respectively described power amplification output circuit and described the 29 resistance R
29, described the 30 resistance R
30, described the 31 resistance R
31, described the 32 resistance R
32, described the 33 resistance R
33one end, described the 29 resistance R
29, described the 30 resistance R
30, described the 31 resistance R
31, described the 32 resistance R
32, described the 33 resistance R
33the equal ground connection of the other end.
The wire-feed motor operating current that the 15th pin of chip and the 16th pin just gather respectively and the safe current of setting compare.Resistance R
29, R
30, R
31, R
32and R
33for sampling resistor, when work, play current sample and overcurrent protection restriction, prevent that wire-feed motor electric current from exceeding safe range.
Below advantage or the principle of floating voltage sampling wire feeding circuit of the present invention are described.
The floating voltage that the technical program is exported by welding machine obtains power supply, then receives pulse width modulation loop through rectifying and wave-filtering, compares by the operating voltage that gathers wire-feed motor both end voltage and setting, realizes the adjustment to wire-feed motor both end voltage.The invention provides a kind of floating voltage sampling wire feeding circuit, give wire-feed motor burning voltage, realize wire feed rate uniform and stable, make welding performance stable, moulding is better.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (10)
1. a floating voltage sampling wire feeding circuit, it is characterized in that, comprise unloaded power supply acquisition cuicuit, wire feed voltage comparator circuit, pulse-width modulation circuit, wire feed rate given circuit, power amplification output circuit, described unloaded power supply acquisition cuicuit connects described wire feed voltage comparator circuit, described wire feed voltage comparator circuit connects described pulse-width modulation circuit and described power amplification output circuit, and described pulse-width modulation circuit connects described wire feed rate given circuit and described power amplification output circuit;
Described unloaded power supply acquisition cuicuit, obtains the power supply of wire-feed motor for the floating voltage of exporting by welding machine;
Described wire feed voltage comparator circuit, for gathering the current voltage at wire-feed motor two ends and feeding back to described pulse-width modulation circuit;
Described pulse-width modulation circuit, for the operating voltage of the current voltage of described wire feed voltage comparator circuit feedback and the setting of described wire feed rate given circuit is compared, and according to comparative result output pulse width modulation waveform;
Described wire feed rate given circuit, sets for the operating voltage to wire-feed motor;
Described power amplification output circuit, for the pulse-width modulation waveform of described pulse-width modulation circuit output is carried out exporting wire-feed motor to after power amplification, provides operating voltage to wire-feed motor.
2. floating voltage sampling wire feeding circuit according to claim 1, is characterized in that, also comprise sample rate current control circuit, described sample rate current control circuit connects described pulse-width modulation circuit and described power amplification output circuit;
Described sample rate current control circuit, for carrying out current sample and overcurrent protection in the time that wire-feed motor is worked.
3. floating voltage sampling wire feeding circuit according to claim 1, is characterized in that, described unloaded power supply acquisition cuicuit comprises the 3rd diode, the first resistance and the first electric capacity; Wherein, described the 3rd diode is fast recovery diode, and described the first electric capacity is electrochemical capacitor;
The positive pole of described the 3rd diode connects the inversion rectification cathode output end of welding machine, the negative pole of described the 3rd diode connects one end of described the first resistance, the other end of described the first resistance connects respectively the positive pole of described the first electric capacity and the electrode input end of wire-feed motor, and the negative pole of described the first electric capacity connects inversion rectification cathode output end the ground connection of welding machine.
4. floating voltage sampling wire feeding circuit according to claim 1, it is characterized in that, described wire feed voltage comparator circuit comprises LM321 operational amplifier, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and the 9th electric capacity;
The first pin of described LM321 operational amplifier connects respectively one end of described the 6th resistance and one end of described the 9th resistance, the other end ground connection of described the 9th resistance, the two ends of described the 5th electric capacity connect respectively the two ends of described the 9th resistance, the other end of described the 6th resistance connects respectively one end of described the 4th electric capacity and one end of described the 7th resistance, the other end of described the 7th resistance connects the electrode input end of wire-feed motor, the other end of described the 4th electric capacity connects respectively one end of described the 3rd resistance and one end of described the 4th resistance, the other end of described the 4th resistance connects the negative input of wire-feed motor, the other end of described the 3rd resistance connects respectively one end of tripod and described second resistance of described LM321 operational amplifier, the other end of described the second resistance connects respectively the 4th pin of described LM321 operational amplifier and one end of described the 5th resistance, the two ends of described the second electric capacity connect respectively the two ends of described the second resistance, the other end of described the 5th resistance connects respectively one end of described the 8th resistance and one end of described the 3rd electric capacity, the other end ground connection of described the 3rd electric capacity, the other end of described the 8th resistance connects described pulse-width modulation circuit, the crus secunda ground connection of described LM321 operational amplifier, the 5th pin of described LM321 operational amplifier connects respectively one end of dc source and described the 9th electric capacity, the other end ground connection of described the 9th electric capacity.
5. floating voltage sampling wire feeding circuit according to claim 1, is characterized in that, described pulse-width modulation circuit comprises TL494C chip; The 18 resistance, the tenth electric capacity, the 13 electric capacity; The first triode, the 3rd triode, the first Zener diode, the 22 resistance, the 25 resistance and the 26 resistance;
The first pin of described TL494C chip connects described wire feed voltage comparator circuit;
The crus secunda of described TL494C chip connects described the tenth one end of electric capacity and one end of described the 13 electric capacity respectively, the other end of described the tenth electric capacity connects one end of described the 18 resistance, the other end of described the 18 resistance connects respectively the tripod of described TL494C chip and the other end of described the 13 electric capacity, and the crus secunda of described TL494C chip also connects described wire feed rate given circuit;
The 9th pin of described TL494C chip connects respectively the tenth pin, one end of described the 26 resistance, the base stage of the base stage of described the first triode and described the 3rd triode, the other end ground connection of described the 26 resistance, the colelctor electrode of described the first triode connects dc source, the emitter stage of described the first triode connects one end of described the 22 resistance, the other end of described the 22 resistance connects respectively one end of described the 25 resistance and the negative pole of described the first Zener diode, the other end of described the 25 resistance connects the emitter stage of described the 3rd triode, the grounded collector of described the 3rd triode, the plus earth of described the first Zener diode, the negative pole of described the first Zener diode also connects described power amplification output circuit.
6. floating voltage sampling wire feeding circuit according to claim 5, is characterized in that, described pulse-width modulation circuit also comprises peripheral biasing circuit, and described peripheral biasing circuit comprises the tenth resistance, the 12 resistance, the 6th electric capacity, the 7th electric capacity; The 11 resistance, the 8th electric capacity; The 14 resistance, the 11 electric capacity;
One end of described the tenth resistance connects respectively the 14 pin of dc source, described TL494C chip and one end of described the 6th electric capacity, the other end ground connection of described the 6th electric capacity, the other end of described the tenth resistance connects respectively the 4th pin, one end of described the 12 resistance and one end of described the 7th electric capacity of described TL494C chip, the other end ground connection of the other end of described the 12 resistance and described the 7th electric capacity;
One end of described the 11 resistance connects respectively the 12 pin of one end, dc source and the described TL494C chip of described the 8th electric capacity, the other end ground connection of described the 8th electric capacity, the other end of described the 11 resistance connects respectively octal and the 11 pin of described TL494C chip;
One end of described the 14 resistance connects the 6th pin of described TL494C chip, and one end of described the 11 electric capacity connects the 5th pin of described TL494C chip, the equal ground connection of the other end of the other end of described the 14 resistance and described the 11 electric capacity.
7. floating voltage sampling wire feeding circuit according to claim 6, is characterized in that the 7th pin of described TL494C chip and the tenth tripod ground connection.
8. floating voltage sampling wire feeding circuit according to claim 1, it is characterized in that, described wire feed rate given circuit comprises the 13 resistance, the 15 resistance, the 16 resistance, the 19 resistance, the 20 resistance, the 12 electric capacity, the 5th diode and potentiometer;
One end of described the 13 resistance connects dc source, the other end of described the 13 resistance connects a fixed contact of described potentiometer, another fixed contact of described potentiometer connects one end of described the 19 resistance, the other end of described the 19 resistance connects the positive pole of described the 5th diode, the minus earth of described the 5th diode, the movable contact of described potentiometer connects respectively described the 15 one end of resistance and one end of described the 20 resistance, the other end ground connection of described the 20 resistance, the other end of described the 15 resistance connects respectively described the 16 one end of resistance and one end of described the 12 electric capacity, the other end ground connection of described the 12 electric capacity, the other end of described the 16 resistance connects described pulse-width modulation circuit.
9. floating voltage sampling wire feeding circuit according to claim 1, is characterized in that, described power amplification output circuit comprises FET, the 17 resistance, the 23 resistance, the 14 electric capacity and the 4th diode;
The grid of described FET connects described pulse-width modulation circuit, and the drain electrode of described FET connects sample rate current control circuit, and described sample rate current control circuit for carrying out current sample and overcurrent protection in the time that wire-feed motor is worked; The source electrode of described FET connects respectively one end of anodal and described the 23 resistance of one end of the negative input of wire-feed motor, described the 17 resistance, described the 4th diode, the other end of described the 17 resistance is connected the electrode input end of wire-feed motor with the negative pole of described the 4th diode, the other end of described the 23 resistance connects one end of described the 14 electric capacity, and the other end of described the 14 electric capacity connects the drain electrode of described FET.
10. floating voltage sampling wire feeding circuit according to claim 2, it is characterized in that, described sample rate current control circuit comprises the 21 resistance, the 24 resistance, the 27 resistance, the 28 resistance, the 29 resistance, the 30 resistance, the 31 resistance, the 32 resistance, the 33 resistance and the 15 electric capacity;
One end of described the 21 resistance connects dc source, the other end of described the 21 resistance connects respectively one end of described pulse-width modulation circuit and described the 24 resistance, the other end ground connection of described the 24 resistance, one end of described the 27 resistance connects described pulse-width modulation circuit, the other end of described the 27 resistance connects respectively described the 15 one end of electric capacity and one end of described the 28 resistance, the other end ground connection of described the 15 electric capacity, the other end of described the 28 resistance connects respectively described power amplification output circuit and described the 29 resistance, described the 30 resistance, described the 31 resistance, described the 32 resistance, one end of described the 33 resistance, described the 29 resistance, described the 30 resistance, described the 31 resistance, described the 32 resistance, the equal ground connection of the other end of described the 33 resistance.
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| CN201410153260.2A CN103894706B (en) | 2014-04-16 | 2014-04-16 | No-load voltage sampling wire feeding circuit |
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| CN201410153260.2A CN103894706B (en) | 2014-04-16 | 2014-04-16 | No-load voltage sampling wire feeding circuit |
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| CN110977103A (en) * | 2019-12-27 | 2020-04-10 | 逢来焊接技术(上海)有限公司 | Novel digital pulse gas shielded welding control circuit |
| CN117206635A (en) * | 2023-10-12 | 2023-12-12 | 泰州市巨久不锈钢有限公司 | Wire feeding system for stainless steel welding |
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| CN110977103A (en) * | 2019-12-27 | 2020-04-10 | 逢来焊接技术(上海)有限公司 | Novel digital pulse gas shielded welding control circuit |
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| CN117206635B (en) * | 2023-10-12 | 2024-03-19 | 泰州市巨久不锈钢有限公司 | Wire feeding system for stainless steel welding |
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| CN103894706B (en) | 2015-07-01 |
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