CN104407658A - Micro-electrical arc welded constant-current control circuit - Google Patents
Micro-electrical arc welded constant-current control circuit Download PDFInfo
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- CN104407658A CN104407658A CN201410553655.1A CN201410553655A CN104407658A CN 104407658 A CN104407658 A CN 104407658A CN 201410553655 A CN201410553655 A CN 201410553655A CN 104407658 A CN104407658 A CN 104407658A
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Abstract
The invention relates to a circuit structure, in particular to to a micro-electrical arc welded constant-current control circuit. A hall current sensor is arranged at the tail end of an anode output circuit of a main transformer; the hall current sensor is connected with a signal collecting circuit; an ADC analog-digital converter and a DSP digital signal processor are successively arranged on the signal collecting circuit; the switching time duty ratio and the switching frequency of an IGBT (Insulated Gate Bipolar Translator) driver are controlled by the DSP digital signal processor by outputting a PWM (Pulse Width Modulation) signal; the IGBT driver and a corresponding high-power inductor are serially connected on a cathode output circuit. The micro-electrical arc welded constant-current control circuit has the advantages that the switching time duty ratio and the switching frequency of IGBT driver are controlled by the DSP digital signal processor by outputting the PWM signal, the purpose of stably controlling the output current is achieved, the high-power inductor is used for performing passive stable current control on the IGBT driver, and the welding current is further stabilized.
Description
Technical field
The present invention relates to a kind of circuit structure, particularly relate to a kind of constant-current control circuit of micro-arc welding.
Background technology
Conventional argon arc welding machine, adopts switch power technology, and the required minimum output current of work also wants 5A, electric current is low again, just cannot ensure the smooth combustion of welding arc, and electric arc is easy to extinguish, but for fine structure or plate sheet welding, need less welding arc electric current.Conventional argon arc welding machine is that the power tube dutycycle by controlling main-transformer carrys out regulation output electric current, and main-transformer just carries out rectification and inductor filter with diode, so cannot realize the stability contorting of small area analysis after exporting simply.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of constant-current control circuit of micro-arc welding.
For realizing above object, the technical solution used in the present invention is:
The constant-current control circuit of micro-arc welding, comprises main-transformer, Hall current sensor, ADC analog to digital converter, DSP, IGBT driver, high-power inductance, positive pole output circuit, signal acquisition circuit, negative pole output circuit; It is characterized in that: main-transformer positive pole output circuit end arranges Hall current sensor, Hall current sensor is connected with signal acquisition circuit, signal acquisition circuit sets gradually ADC analog to digital converter, DSP, DSP is by the dutycycle and switching frequency switching time of output pwm signal control IGBT driver, and IGBT driver is connected in series on negative pole output circuit with corresponding high-power inductance respectively.
Advantage of the present invention is: (1), by the signal acquiring processing system of ADC analog to digital converter, DSP composition, is analyzed and processes the current sampling signal in welding circuit; (2) by DSP output pwm signal, pwm signal is by high speed photo coupling control IGBT driver, thus the dutycycle and switching frequency switching time of control IGBT driver, reach the object of stability contorting output current; (3) high-power inductance is connected with IGBT driver, carry out passive current stabilization control, further stable welding current.
Circuit of the present invention under the DC voltage condition of 60V, minimum can micro-electric arc of smooth combustion of control 0.25A, solve a meticulous welding technology difficult problem.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present invention.
Embodiment
As shown in the figure, the constant-current control circuit of the micro-arc welding of the present invention, comprises main-transformer 1, Hall current sensor 2, ADC analog to digital converter 3, DSP 4, IGBT driver 5, high-power inductance 6, positive pole output circuit 7, signal acquisition circuit 8, negative pole output circuit 9, main-transformer 1 positive pole output circuit 7 end arranges Hall current sensor 2, Hall current sensor 2 is connected with signal acquisition circuit 8, signal acquisition circuit 8 sets gradually ADC analog to digital converter 3, DSP 4, DSP 4 is by the dutycycle and switching frequency switching time of output pwm signal control IGBT driver 5, and IGBT driver 5 is connected in series on negative pole output circuit 9 with corresponding high-power inductance 6 respectively, during work, Hall current sensor 2 gathers the electric current that main-transformer 1 positive pole exports, the current signal of collection is transported to high speed 16bit ADC analog to digital converter 3 by signal acquisition circuit 8, through ADC analog to digital converter 3 analog current signal be converted to digital current signal and deliver to high-speed dsp digital signal processor 4 li, after DSP 4 pairs of current sampling signals carry out computational analysis, according to certain proportion integration differentiation coefficient, the pwm signal exported is controlled, pwm signal is by high speed photo coupling control IGBT driver 5, thus the dutycycle and switching frequency switching time of control IGBT driver 5, reach the object of stability contorting output current, in negative pole output circuit 9, high-power inductance 6 pairs of IGBT drivers 5 carry out passive current stabilization control simultaneously, further stable welding current.Under the voltage conditions of 60V, minimum can micro-electric arc of smooth combustion of control 0.25A.
Claims (1)
1. the constant-current control circuit of micro-arc welding, comprise main-transformer, Hall current sensor, ADC analog to digital converter, DSP, IGBT driver, high-power inductance, positive pole output circuit, signal acquisition circuit, negative pole output circuit, it is characterized in that: main-transformer positive pole output circuit end arranges Hall current sensor, Hall current sensor is connected with signal acquisition circuit, signal acquisition circuit sets gradually ADC analog to digital converter, DSP, DSP is by output pwm signal control IGBT driver, IGBT driver is connected in series on negative pole output circuit with corresponding high-power inductance respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410553655.1A CN104407658A (en) | 2014-10-17 | 2014-10-17 | Micro-electrical arc welded constant-current control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410553655.1A CN104407658A (en) | 2014-10-17 | 2014-10-17 | Micro-electrical arc welded constant-current control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104407658A true CN104407658A (en) | 2015-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410553655.1A Pending CN104407658A (en) | 2014-10-17 | 2014-10-17 | Micro-electrical arc welded constant-current control circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN104407658A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60250874A (en) * | 1984-05-29 | 1985-12-11 | Matsushita Electric Ind Co Ltd | Power source for welding |
| GB2309130A (en) * | 1996-01-11 | 1997-07-16 | Illinois Tool Works | Arc welding; switch mode power supply |
| CN2838834Y (en) * | 2005-06-20 | 2006-11-22 | 北京工业大学 | Feedback signal control circuit for double-silk MAG inverted welding power supply |
| CN101406984A (en) * | 2008-11-19 | 2009-04-15 | 上海沪工电焊机制造有限公司 | Fuzzy control method of TIG welding source ring closure |
-
2014
- 2014-10-17 CN CN201410553655.1A patent/CN104407658A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60250874A (en) * | 1984-05-29 | 1985-12-11 | Matsushita Electric Ind Co Ltd | Power source for welding |
| GB2309130A (en) * | 1996-01-11 | 1997-07-16 | Illinois Tool Works | Arc welding; switch mode power supply |
| CN2838834Y (en) * | 2005-06-20 | 2006-11-22 | 北京工业大学 | Feedback signal control circuit for double-silk MAG inverted welding power supply |
| CN101406984A (en) * | 2008-11-19 | 2009-04-15 | 上海沪工电焊机制造有限公司 | Fuzzy control method of TIG welding source ring closure |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150311 |