CN202411646U - Guidance arc current circuit for plasma cutting power supply - Google Patents
Guidance arc current circuit for plasma cutting power supply Download PDFInfo
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- CN202411646U CN202411646U CN2012200300816U CN201220030081U CN202411646U CN 202411646 U CN202411646 U CN 202411646U CN 2012200300816 U CN2012200300816 U CN 2012200300816U CN 201220030081 U CN201220030081 U CN 201220030081U CN 202411646 U CN202411646 U CN 202411646U
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Abstract
The utility model relates to a plasma cutting power supply, in particular to a guidance arc current circuit for a plasma cutting power supply. According to the guidance arc current circuit, a double-inductance superposition type reactor is adopted, inductance which is doubly superposed with a main circuit is acquired on a plasma guide arc current circuit by means of the conventional reactor iron cores of plasma cutting arc current main circuits, so that the inductance value of the guidance arc current circuit is effectively improved, the follow current of the plasma guide arc current is stable, and the arc is not broken in a low-current state. The guidance arc current circuit is used for triggering low-current and high-frequency arcs of the guide arc, and a striking arc is immediately converted into the plasma guide arc inside a cutting torch under the action of the follow current of the inductance which is doubly superposed; and the guide arc current is still constant and smooth even if the high-frequency arc is extinguished, so that the time of high-frequency interference and high-frequency discharge triggering is reduced, the success rate of the striking arc is improved, and the plasma guide arc is quickly transferred into the plasma cutting arc with constant current.
Description
Affiliated technical field
The utility model relates to a kind of plasma cutting power supply, especially wherein produce the circuit of pilot electric current.
Background technology
What in the prior art, the circuit of plasma cutting power supply generation plasma pilot electric current adopted is single inductance afterflow structure.Because inductance value is less, the electric energy of storage is big inadequately, and after little current over-zero of high frequency that triggers the plasma pilot or cut-out, current interruption can take place the plasma pilot, can't translate into normal plasma arc cutting.In order to improve the stability of plasma pilot electric current, need to adopt the solution that increases cutting arc main circuit reactor inductance amount or prolong the pilot circuits for triggering solution of high-frequency discharge time.In above-mentioned first kind of scheme; Because plasma pilot electric current is very little; Be prone to current interruption; Plasma cutting arc current value is a pilot current value more than 3 times, and it is irrational increasing the anti-device inductance value of main circuit large-current electric in order to improve little electric current pilot stability, has caused the waste of main circuit ferromagnetic material and conductive material.In above-mentioned second kind of scheme, the increase of high-frequency discharge intensity, the prolongation of high-frequency discharge time all can bring bigger High-frequency Interference, and the person and the safety of equipment are caused damage.
Summary of the invention
The utility model is to the deficiency of prior art, provides that a kind of stability is strong, arcing initiation success rate is high, consumes ferromagnetic material and conductive material is low, lower the plasma pilot current circuit of High-frequency Interference.
The solution that the utility model adopts:
The pilot current circuit of this plasma cutting power supply comprises inversion and rectification circuit (1), pilot and cutting arc control circuit (2), pilot freewheeling circuit (3).
Described inversion and rectification circuit (1); Comprise three-phase input rectification circuit (13), IGBT inversion bridge circuit (12), intermediate-frequency transformer (14), FRD fast-recovery commutation output circuit (15); IGBT inversion bridge circuit (12) input is connected with three-phase input power supply through three-phase input rectification circuit (13); IGBT inversion bridge-type circuit output end connects the elementary winding of intermediate-frequency transformer (14); The secondary windings of intermediate-frequency transformer (14) is connected on FRD fast-recovery commutation output circuit (15); The output of the negative pole of rectifying output circuit (15) is received cutting torch negative electrode (4) through pilot freewheeling circuit (3), and the positive pole of rectifying output circuit (15) is exported through pilot and cutting arc control circuit (2), pilot freewheeling circuit (3) and received cutting torch positive electricity nozzle (5) and be cut on the workpiece (6).Constitute the plasma pilot current circuit of plasma cutting power supply with decline external characteristics.
Described pilot and cutting arc control circuit (2) comprise CGQ Hall current sensor (9), pilot on-off circuit (10), inverter conducting width adjusting and Current Feedback Control circuit (11).Receive inversion and rectification circuit (1) after the signal of adjusting inverter conducting width and current feedback is drawn, carry out close-loop feedback control.The positive pole output of rectifying output circuit (15) is divided into two-way and gets into Hall current sensor (9); The first via is received through Hall current sensor (9) and is cut workpiece (6), and the second the tunnel receives cutting torch positive electricity nozzle (5) through pilot on-off circuit (10), Hall current sensor (9), pilot freewheeling circuit (3).
Described pilot freewheeling circuit (3); Comprise two inductance superposing type reactors (8), cutting torch negative electrode (4), cutting torch positive electricity nozzle (5), pilot circuits for triggering (7); Two groups of inductance outputs of two inductance superposing type reactors (8) are connected with cutting torch negative electrode (4), cutting torch positive electricity nozzle (5) respectively, and the output of pilot trigger (7) directly is connected with cutting torch negative electrode (4), cutting torch positive electricity nozzle (5).
Described pilot freewheeling circuit (3) is provided with two inductance superposing type reactors (8), is to be made up of coiling two groups of inductance L 1, L2 on the existing core of reactor of cutting arc electric current main circuit, and L1 is the inductance that can only flow through 25 amperes of little electric currents of following pilot; With less conductor coiling 70～90 circles on iron core of sectional area, inductance value is bigger, reaches 2～3mh; L2 can flow through the inductance that the big electric current of cutting arc more than 100 amperes can flow through 25 amperes of little electric currents of following pilot again, and with bigger conductor coiling 15～25 circles on iron core of sectional area, inductance value is less; 0.1～0.3mh is only arranged, and the magnetic circuit of inductance L 1 and inductance L 2 shared same square shape silicon steel sheets compositions is according to the polar end method that connects in the same way; Two groups of flow direction unanimities that inductance L 1, L2 produce at shared iron core magnet, in the pilot generative process, inductance L 1 superposes with the magnetic flux forward that inductance L 2 produces; The total inductance amount reaches maximum L1+L2, and as the two inductance superposing type reactors with the stores electric energy of magnetic, the big more store electrical energy of inductance value is also just many more; Meet pilot and keep the condition of not current interruption because of the little needs of electric current with big inductance afterflow, after pilot translated into cutting arc, the pilot electric current was directed arc on-off circuit (10) and cuts off automatically; Inductance L 1 quits work; Only stay single inductance L 2 and be connected cutting arc electric current main circuit, the loop inductance value is minimum, meet cutting arc because of electric current big only with small inductor just can afterflow condition; Two inductance of stack are that the formation of pilot provides enough big energy storage afterflow path; Guarantee the not current interruption of plasma pilot electric current, behind the little failure of current of high frequency arc of pilot trigger (7) output, the plasma pilot electric current that moment is triggered still can circulate on the plasma channel that air-gap between cutting torch negative electrode (4) and the positive electricity nozzle (5) forms; It is constant steady that electric current keeps, and forms the plasma cutting arc of current constant at last.
The utility model is owing to be two inductance afterflow structures that superpose at the pilot current circuit with single inductance afterflow structural change; Utilize the existing core of reactor of plasma cutting arc electric current main circuit; Obtain the inductance with the dual stack of main circuit at plasma pilot current circuit, practiced thrift ferromagnetic material and conductive material.Because the inductance of dual stack has been arranged, effectively improved the inductance value of pilot current circuit, can make the afterflow of plasma pilot electric current stable, not current interruption under the little current status.Striking moment is used to trigger the little electric current high frequency arc of pilot, can under the inductance afterflow effect of dual stack, be the plasma pilot at the cutting torch inner transformation immediately; In whole pilot electric current production process; After even the high frequency expulsion of arc goes out, it is constant steady that plasma pilot electric current still can keep, and the high-frequency discharge triggered time reduces 80%; Reduce High-frequency Interference, improved arcing initiation success rate, can translate into pilot the plasma cutting arc of current constant fast.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
Fig. 1 is the plasma pilot current circuit figure of the utility model.
The specific embodiment
Fig. 1 has provided the circuit theory diagrams of the utility model.The plasma pilot current circuit of plasma cutting power supply comprises three parts: inversion and rectifying output circuit (1), pilot and cutting arc control circuit (2), pilot freewheeling circuit (3).
Described inversion and rectification circuit (1); Comprise three-phase input rectification circuit (13), IGBT inversion bridge circuit (12), intermediate-frequency transformer (14), FRD fast-recovery commutation output circuit (15); IGBT inversion bridge circuit (12) input is connected with three-phase input power supply through three-phase input rectification circuit (13); IGBT inversion bridge-type circuit output end connects the elementary winding of intermediate-frequency transformer (14); The secondary windings of intermediate-frequency transformer (14) is connected on FRD fast-recovery commutation output circuit (15); The output of the negative pole of rectifying output circuit (15) is received cutting torch negative electrode (4) through pilot freewheeling circuit (3), and the positive pole of rectifying output circuit (15) is exported through pilot and cutting arc control circuit (2), pilot freewheeling circuit (3) and received cutting torch positive electricity nozzle (5) and be cut on the workpiece (6).Constitute the plasma pilot current circuit of plasma cutting power supply with decline external characteristics.
Described pilot and cutting arc control circuit (2) comprise CGQ Hall current sensor (9), pilot on-off circuit (10), inverter conducting width adjusting and Current Feedback Control circuit (11).Receive inversion and rectification circuit (1) after the signal of adjusting inverter conducting width and current feedback is drawn, carry out close-loop feedback control.The positive pole output of rectifying output circuit (15) is divided into two-way and gets into Hall current sensor (9); The first via is received through Hall current sensor (9) and is cut workpiece (6), and the second the tunnel receives cutting torch positive electricity nozzle (5) through pilot on-off circuit (10), Hall current sensor (9), pilot freewheeling circuit (3).
Described pilot freewheeling circuit (3); Comprise two inductance superposing type reactors (8), cutting torch negative electrode (4), cutting torch positive electricity nozzle (5), pilot circuits for triggering (7); Two groups of inductance outputs of two inductance superposing type reactors (8) are connected with cutting torch negative electrode (4), cutting torch positive electricity nozzle (5) respectively, and the output of pilot trigger (7) directly is connected with cutting torch negative electrode (4), cutting torch positive electricity nozzle (5).
Described pilot freewheeling circuit (3) is provided with two inductance superposing type reactors (8), is to be made up of coiling two groups of inductance L 1, L2 on the existing core of reactor of cutting arc electric current main circuit, and L1 is the inductance that can only flow through 25 amperes of little electric currents of following pilot; With less conductor coiling 70～90 circles on iron core of sectional area, inductance value is bigger, reaches 2～3mh; L2 can flow through the inductance that the big electric current of cutting arc more than 100 amperes can flow through 25 amperes of little electric currents of following pilot again, and with bigger conductor coiling 15～25 circles on iron core of sectional area, inductance value is less; 0.1～0.3mh is only arranged, and the magnetic circuit of inductance L 1 and inductance L 2 shared same square shape silicon steel sheets compositions is according to the polar end method that connects in the same way; Two groups of flow direction unanimities that inductance L 1, L2 produce at shared iron core magnet, in the pilot generative process, inductance L 1 superposes with the magnetic flux forward that inductance L 2 produces; The total inductance amount reaches maximum L1+L2, and as the two inductance superposing type reactors with the stores electric energy of magnetic, the big more store electrical energy of inductance value is also just many more; Meet pilot and keep the condition of not current interruption because of the little needs of electric current with big inductance afterflow, after pilot translated into cutting arc, the pilot electric current was directed arc on-off circuit (10) and cuts off automatically; Inductance L 1 quits work; Only stay single inductance L 2 and be connected cutting arc electric current main circuit, the loop inductance value is minimum, meet cutting arc because of electric current big only with small inductor just can afterflow condition; Two inductance of stack are that the formation of pilot provides enough big energy storage afterflow path; Guarantee the not current interruption of plasma pilot electric current, behind the little failure of current of high frequency arc of pilot trigger (7) output, the plasma pilot electric current that moment is triggered still can circulate on the plasma channel that air-gap between cutting torch negative electrode (4) and the positive electricity nozzle (5) forms; It is constant steady that electric current keeps, and forms the plasma cutting arc of current constant at last.
The utility model is owing to be two inductance afterflow structures that superpose at the pilot current circuit with single inductance afterflow structural change; Utilize the existing core of reactor of plasma cutting arc electric current main circuit; Obtain the inductance with the dual stack of main circuit at plasma pilot current circuit, practiced thrift ferromagnetic material and conductive material.Because the inductance of dual stack has been arranged, effectively improved the inductance value of pilot current circuit, can make the afterflow of plasma pilot electric current stable, not current interruption under the little current status.Striking moment is used to trigger the little electric current high frequency arc of pilot, can under the inductance afterflow effect of dual stack, be the plasma pilot at the cutting torch inner transformation immediately; In whole pilot electric current production process; After even the high frequency expulsion of arc goes out, it is constant steady that plasma pilot electric current still can keep, and the high-frequency discharge triggered time reduces 80%; Reduce High-frequency Interference, improved arcing initiation success rate, can translate into pilot the plasma cutting arc of current constant fast.
During practical implementation; Inverter conducting width adjusting and Current Feedback Control circuit (11) are accomplished the closed loop of plasma cutting power supply system; Make plasma cutting power supply and plasma pilot power supply become constant-current supply, current feedback signal obtains from CGQ Hall current sensor (9) output.
Claims (2)
1. the pilot current circuit of a plasma cutting power supply; Its operating circuit comprises: inversion and rectification circuit (1), pilot and cutting arc control circuit (2), pilot freewheeling circuit (3); IGBT inversion bridge circuit (12) input of inversion and rectification circuit (1) is connected with three-phase input power supply through three-phase input rectification circuit (13); IGBT inversion bridge-type circuit output end connects the elementary winding of intermediate-frequency transformer (14); Pilot and cutting arc control circuit (2) are provided with the control circuit of regulating IGBT inversion bridge-type circuit turn-on width, carrying out closed loop feedback; The secondary windings of intermediate-frequency transformer (14) is connected on FRD fast-recovery commutation output circuit (15), through pilot freewheeling circuit (3), constitutes the pilot current circuit of the plasma cutting power supply with decline external characteristics;
It is characterized in that: described pilot freewheeling circuit (3); Comprise two inductance superposing type reactors (8), cutting torch negative electrode (4), cutting torch positive electricity nozzle (5), pilot trigger (7); Two groups of inductance outputs of two inductance superposing type reactors (8) are connected with cutting torch negative electrode (4), cutting torch positive electricity nozzle (5) respectively, and the output of pilot trigger (7) directly is connected with cutting torch negative electrode (4), cutting torch positive electricity nozzle (5).
2. the pilot current circuit of plasma cutting power supply according to claim 1 is characterized in that: described pilot freewheeling circuit (3) is provided with two inductance superposing type reactors (8), is to be made up of coiling two groups of inductance L 1, L2 on the existing core of reactor of cutting arc electric current main circuit; L1 is the inductance that can only flow through 25 amperes of little electric currents of following pilot, and with less conductor coiling 70～90 circles on iron core of sectional area, inductance value is bigger; Reach 2～3mh, L2 can flow through the inductance that the big electric current of cutting arc more than 100 amperes can flow through 25 amperes of little electric currents of following pilot again, with bigger conductor coiling 15～25 circles on iron core of sectional area; Inductance value is less, and 0.1～0.3mh is only arranged, the magnetic circuit of inductance L 1 and inductance L 2 shared same square shape silicon steel sheets compositions; According to the polar end method that connects in the same way, two groups of flow direction unanimities that inductance L 1, L2 produce at shared iron core magnet are in the pilot generative process; The magnetic flux forward stack that inductance L 1 and inductance L 2 produce, the total inductance amount reaches maximum L1+L2, as the two inductance superposing type reactors with the stores electric energy of magnetic; The big more store electrical energy of inductance value is also just many more; Meet pilot and keep the condition of not current interruption because of the little needs of electric current with big inductance afterflow, after pilot translated into cutting arc, the pilot electric current was directed arc on-off circuit (10) and cuts off automatically; Inductance L 1 quits work; Only stay single inductance L 2 and be connected cutting arc electric current main circuit, the loop inductance value is minimum, meet cutting arc because of electric current big only with small inductor just can afterflow condition; Two inductance of stack are that the formation of pilot provides enough big energy storage afterflow path; Guarantee the not current interruption of plasma pilot electric current, behind the little failure of current of high frequency arc of pilot trigger (7) output, the plasma pilot electric current that moment is triggered still can circulate on the plasma channel that air-gap between electronegative electrode of cutting torch (4) and the positively charged nozzle (5) forms; It is constant steady that electric current keeps, and forms the plasma cutting arc of current constant at last.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200300816U CN202411646U (en) | 2012-01-15 | 2012-01-15 | Guidance arc current circuit for plasma cutting power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200300816U CN202411646U (en) | 2012-01-15 | 2012-01-15 | Guidance arc current circuit for plasma cutting power supply |
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| Publication Number | Publication Date |
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| CN202411646U true CN202411646U (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200300816U Withdrawn - After Issue CN202411646U (en) | 2012-01-15 | 2012-01-15 | Guidance arc current circuit for plasma cutting power supply |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554404A (en) * | 2012-01-15 | 2012-07-11 | 杭州凯尔达电焊机有限公司 | Guide arc current circuit for plasma cutting power supply |
| CN103264214A (en) * | 2013-04-28 | 2013-08-28 | 华中科技大学 | Arcing circuit for plasma arc cutting |
| CN103433608A (en) * | 2013-08-12 | 2013-12-11 | 华中科技大学 | Method and device for controlling modular chopped mode plasma cutting power source |
| CN103692072A (en) * | 2013-12-18 | 2014-04-02 | 华南理工大学 | High-power type laser plasma arc cutting system |
| CN105414728A (en) * | 2015-12-25 | 2016-03-23 | 华中科技大学 | Single-sensor arc striking circuit and control method thereof for air plasma cutter |
-
2012
- 2012-01-15 CN CN2012200300816U patent/CN202411646U/en not_active Withdrawn - After Issue
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554404A (en) * | 2012-01-15 | 2012-07-11 | 杭州凯尔达电焊机有限公司 | Guide arc current circuit for plasma cutting power supply |
| CN102554404B (en) * | 2012-01-15 | 2015-12-16 | 杭州凯尔达电焊机有限公司 | A kind of pilot arc current circuit of plasma cutting power supply |
| CN103264214A (en) * | 2013-04-28 | 2013-08-28 | 华中科技大学 | Arcing circuit for plasma arc cutting |
| CN103264214B (en) * | 2013-04-28 | 2015-03-04 | 华中科技大学 | Arcing circuit for plasma arc cutting |
| CN103433608A (en) * | 2013-08-12 | 2013-12-11 | 华中科技大学 | Method and device for controlling modular chopped mode plasma cutting power source |
| CN103433608B (en) * | 2013-08-12 | 2015-11-11 | 华中科技大学 | A kind of modularization chopped mode plasma cutting power supply control method and device |
| CN103692072A (en) * | 2013-12-18 | 2014-04-02 | 华南理工大学 | High-power type laser plasma arc cutting system |
| CN103692072B (en) * | 2013-12-18 | 2016-03-02 | 华南理工大学 | High-power class laser plasma arc diced system |
| CN105414728A (en) * | 2015-12-25 | 2016-03-23 | 华中科技大学 | Single-sensor arc striking circuit and control method thereof for air plasma cutter |
| CN105414728B (en) * | 2015-12-25 | 2017-09-15 | 华中科技大学 | A kind of air plasma cutter single-sensor arc ignition circuit and its control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120905 Effective date of abandoning: 20151216 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |