CN204349829U - Wide region plasma cutting machine current source - Google Patents
Wide region plasma cutting machine current source Download PDFInfo
- Publication number
- CN204349829U CN204349829U CN201420811687.2U CN201420811687U CN204349829U CN 204349829 U CN204349829 U CN 204349829U CN 201420811687 U CN201420811687 U CN 201420811687U CN 204349829 U CN204349829 U CN 204349829U
- Authority
- CN
- China
- Prior art keywords
- phase
- inductance
- electric capacity
- rectifier
- electrochemical capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Arc Welding In General (AREA)
Abstract
The utility model relates to a kind of wide region plasma cutting machine current source, comprise front stage circuits, late-class circuit and cutting torch circuit, described front stage circuits comprises three-phase LC filter and three-phase rectifier, wherein one end of the first inductance is connected with the live wire Ua of three-phase alternating-current supply, the a phase input of the other end and rectifier bridge in three-phase rectifier, one end of first electric capacity is connected, one end of second inductance is connected with the live wire Ub of three-phase alternating-current supply, the b phase input of the other end and rectifier bridge in three-phase rectifier, one end of second electric capacity is connected, one end of 3rd inductance is connected with the live wire Uc of three-phase alternating-current supply, the c phase input of the other end and three-phase commutation bridge in three-phase rectifier, one end of 3rd electric capacity is connected, first electric capacity, second electric capacity is connected with the other end of the 3rd electric capacity, described three-phase rectifier is made up of three-phase commutation bridge, resistance and the first electrochemical capacitor, wherein the positive pole of three-phase commutation bridge first resistance in parallel with between negative pole and the first electrochemical capacitor.
Description
Technical field
The utility model relates to a kind of plasma cut DC power supply without the need to step-down transformer, wide region direct current scope, particularly, relates to a kind of wide region plasma cutting machine current source.
Background technology
Machine plasma cutter is made up of plant equipment, control panel, air feed equipment etc., wherein control panel comprises power-supply system, digital control system, torch systems and ECAN bus, and power-supply system comprises again the major parts such as plasma power supply, striking case, Pneumatic controlled box, cooling system, pipeline.
Plasma power supply is one of core component of machine plasma cutter, according to its development course, successively can comprise various silicon rectifier formula power supply, SCR controlled rectifier power supply, contravariant power and chopped mode power supply.Wherein, contravariant power, chopped mode power supply are the most potential power supply machines.Contravariant power is applicable to the application scenario that output current is positioned at 30A-200A, below 20kW.In view of holistic cost is lower, efficiency is higher, control is convenient and be convenient to capacity extensions, especially cutting current quality is higher, in high powered plasma cutter sweep, chopped mode power supply is favored day by day, power circuit supports that output current grade is by 130A, 260A, 400A, 530A, 650A, 800, even reach 1000A, for cutting thicker sheet metal and tubing, power grade also surpasses 175kW direction by 22kW to be increased.During normal work, plasma column voltage range is 50-175V (260A grade), 50-150V (130A grade) left and right, but output current grade is relevant with cutting machine capacity configuration, and output characteristic is quick droop characteristic.
Original chopped mode power supply is in order to obtain lower VD, and power circuit one general configuration is as follows:
(1) triphase step-down transformer and three-phase diode uncontrollable rectifier device is adopted, input three-phase 380V AC sinusoidal voltage, obtain three-phase 220V alternating voltage, obtain the direct voltage of unloaded about 311V after rectifier, step-down and rectification efficiency only have about 0.98*0.98=0.96;
(2) adopt single-stage copped wave (step-down) BUCK DC-DC converter, because output dc voltage is lower, when output current is lower, duty ratio is comparatively large, and there will not be the lower and relevant issues of duty ratio, the efficiency of chopping depressuring only has 0.94-0.96,
As a result, finally make overall efficiency to reach 0.88-0.94, adopt soft switch technique can raising efficiency to about 0.96.Because step-down transformer have employed Y/Y Δ structure, net side power factor can reach 0.88 (exporting 130A) and 0.98 (exporting 260A).
For powerful chopped mode power supply, in order to improve net side power factor, the high-power step-down transformer of many secondary winding can only be adopted, can net side power factor be risen to close to 1, and step-down transformer plays electrical isolation effect, be conducive to stability and the reliability of improving plasma cutting machine system, and without the need to the soft link that powers on.But step-down transformer is bulky, very heavy, consumable material and cost of transportation more, and conversion efficiency is not high yet, generally not higher than 0.96-0.98.Be not extra high chopped mode power supply for power, can adopt the supply power mode of three-phase LC filter+diode rectifier, eliminate step-down transformer, rated load off line side power factor promotes also can accomplish more than 0.96.
Owing to not adopting step-down transformer, and have employed three-phase LC filter, the unloaded direct voltage of rectifier will higher than net pressure peak level (about 600V), comparatively large with normal killer voltage 50-175V gap, if adopt traditional single stage BUCK DC-DC converter, make lowest duty cycle too low, particularly serious under underloading, BUCK DC-DC converter loses controllability under being operated in DCM state, causes switching loss to increase.Multistage traditional BUCK DC-DC converter can be adopted to connect successively or support the novel B UCK DC-DC converter of wide region electric current for this reason.
More than comprehensive, the utility model is exactly do not use step-down transformer, change and use three-phase LC filter, multistage traditional BUCK DC-DC converter is adopted to connect successively or support the novel B UCK DC-DC converter of wide region electric current, form the power circuit of the plasma power supply of a kind of applicable below 130A, i.e. wide region plasma cutting machine current source.
Through the retrieval to wide region plasma cutting machine current source prior art and correlation technique, find to mainly contain following representative document:
Tian Guotao. the research of the PWM Square-type inverter power supply that wide-range voltage exports can be realized. South China Science & Engineering University, master thesis, 2004;
Wu Jian. the research of plasma cut high-performance electric origin system. Nanjing Aero-Space University, master thesis, 2010.
The former proposes the PWM Square-type transformation topology that a kind of wide-range voltage exports, and the latter proposes a kind of plasma power supply adopting step-down transformer and single-stage BUCK DC-DC converter.
More than comprehensive, find after wide region plasma cutting machine current source prior art and correlation technique retrieval, there is no the power circuit of the plasma power supply of applicable below the 130A formed based on three-phase LC filter, two-stage series connection BUCK DC-DC converter or support wide region electric current BUCK DC-DC converter etc.
Utility model content
For defect of the prior art, the utility model provides a kind of wide region plasma cutting machine current source, supports that exporting direct current can reach 130A, and circuit is simple, it is convenient to control, and has that input power factor is high, overall efficiency advantages of higher simultaneously.
The utility model provides a kind of wide region plasma cutting machine current source, comprise front stage circuits, late-class circuit and cutting torch circuit, described front stage circuits comprises three-phase LC filter and three-phase rectifier, described three-phase LC filter comprises the first inductance, second inductance, 3rd inductance, first electric capacity, second electric capacity, 3rd electric capacity, wherein one end of the first inductance is connected with the live wire Ua of three-phase alternating-current supply, the a phase input of the other end and rectifier bridge in three-phase rectifier, one end of first electric capacity is connected, one end of second inductance is connected with the live wire Ub of three-phase alternating-current supply, the b phase input of the other end and rectifier bridge in three-phase rectifier, one end of second electric capacity is connected, one end of 3rd inductance is connected with the live wire Uc of three-phase alternating-current supply, the c phase input of the other end and three-phase commutation bridge in three-phase rectifier, one end of 3rd electric capacity is connected, first electric capacity, second electric capacity is connected with the other end of the 3rd electric capacity, described three-phase rectifier is made up of three-phase commutation bridge, resistance and the first electrochemical capacitor, wherein the positive pole of three-phase commutation bridge first resistance in parallel with between negative pole and the first electrochemical capacitor.
Described late-class circuit comprises a BUCK DC-DC converter, the 2nd BUCK DC-DC converter, and a described BUCK DC-DC converter is connected with the 2nd BUCK DC-DC converter.
A described BUCK DC-DC converter comprises the first diode, the 4th inductance, the first IGBT module and the second electrochemical capacitor, and the 2nd BUCK DC-DC converter comprises the second diode, the second IGBT module and the 5th inductance; Wherein in one end of negative electrode and the 4th inductance of the first diode, front stage circuits, the positive pole of the first electrochemical capacitor is connected, the anode of the first diode is connected with the collector electrode of the negative electrode of the second electrochemical capacitor, the first IGBT module, the emitter of the first IGBT module connects the negative pole of the first electrochemical capacitor, the other end of the 4th inductance is connected with the anode of the second electrochemical capacitor, one end of the 5th inductance, the negative electrode of the second diode, the anode of the second diode is connected with the second IGBT module collector electrode, and the emitter of the second IGBT module connects the negative electrode of the second electrochemical capacitor.
Described cutting torch circuit comprises workpiece and cutting torch, and workpiece is connected with the other end of the 5th inductance in late-class circuit, and cutting torch is connected with the anode of the second diode in late-class circuit, the collector electrode of the second IGBT module.
Compared with prior art, the utility model has following beneficial effect:
Operation principle of the present utility model is the repertoire adopting front stage circuits, late-class circuit and cutting torch circuit realiration wide region plasma cutting machine current source, described front stage circuits completes filtering to AC power and rectification, the BUCK DC-DC that late-class circuit completes the output of wide electric current converts, cutting torch circuit completes the cutting to workpiece, particularly:
Described front stage circuits, three-phase alternating voltage, after three-phase LC filter, three-phase rectifier, obtains direct voltage, due to LC resonance reason, when zero load, obtains DC voltage average value higher than net voltage crest value, depending on resonant intensity.Under underloading, DC voltage average value is substantially equal to net voltage crest value.Under heavy duty, DC voltage average value is substantially lower than net voltage crest value.When parameter configuration is reasonable, under the effect of three-phase LC filter, the net side power factor close to more than 0.96 can be obtained.
Described late-class circuit is wide region BUCK DC-DC conversion circuit, the direct voltage that input front stage circuits provides, and exports direct current.The Size-dependent of direct current is in the watt level needed for workpiece to be cut.If the duty ratio of power device IGBT module is d1 in the first single-stage BUCK DC-DC conversion circuit, in second single-stage BUCK DC-DC conversion circuit, the duty ratio of power device IGBT module is d2, then the final duty ratio of late-class circuit is than d1*d2, be positioned at [0,1], by reasonable adjusting d1 and d2 size, the direct current of wide range output can be produced.When input direct voltage height, require that duty ratio d1*d2 is larger, same direct current could be exported, therefore late-class circuit is applicable to High Level DC Voltage input, solve that the low switching loss brought of duty ratio is large, output current regulating power difference and the practical problem such as step-down transformer is heavy, be a kind of important innovation.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model.
Fig. 2 is the schematic diagram of three-phase commutation bridge described in the utility model.
Embodiment
Below in conjunction with specific embodiment, the utility model is described in detail.
See Fig. 1 to Fig. 2, the utility model provides a kind of wide current plasma cutting machine current source, comprise front stage circuits 1, late-class circuit 2 and cutting torch circuit 3, described front stage circuits 1 comprises three-phase LC filter and three-phase rectifier, described three-phase LC filter comprises the first inductance L 1, second inductance L 2, 3rd inductance L 3, first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, wherein one end of the first inductance L 1 is connected with the live wire Ua of three-phase alternating-current supply, the other end of the first inductance L 1 and a phase input of three-phase commutation bridge B1 in three-phase rectifier, one end of first electric capacity C1 is connected, one end of second inductance L 2 is connected with the live wire Ub of three-phase alternating-current supply, the other end of the second inductance L 2 and the b phase input of three-phase commutation bridge B1 in three-phase rectifier, one end of second electric capacity C2 is connected, one end of 3rd inductance L 3 is connected with the live wire Uc of three-phase alternating-current supply, the c phase input of the 3rd inductance L 3 other end and three-phase commutation bridge B1 in three-phase rectifier, one end of 3rd electric capacity C3 is connected, first electric capacity C1, second electric capacity C2 is connected with the other end of the 3rd electric capacity C3, described three-phase rectifier comprises three-phase commutation bridge B1, resistance R1 and the first electrochemical capacitor E1, wherein parallel resistance R1 and the first electrochemical capacitor E1 between the positive pole of three-phase commutation bridge B1 and negative pole.
Described late-class circuit comprises a BUCK DC-DC converter S1, the 2nd BUCK DC-DC converter S2, and a described BUCK DC-DC converter S1 connects with the 2nd BUCK DC-DC converter S2, a described BUCK DC-DC converter S1 comprises the first diode D1, the 4th inductance L 4, first IGBT module S1 and the second electrochemical capacitor E2, the 2nd BUCK DC-DC converter S2 comprise the second diode D2, the second IGBT module S2 and the 5th inductance L 5, the wherein negative electrode of the first diode D1 and one end of the 4th inductance L 4, in front stage circuits, the positive pole of the first electrochemical capacitor E1 is connected, the anode of the first diode D1 and the negative electrode of the second electrochemical capacitor E2, the collector electrode of the first IGBT module S1 connects, the emitter of the first IGBT module S1 connects the negative pole of the first electrochemical capacitor E1, the other end of the 4th inductance L 4 and the anode of the second electrochemical capacitor E2, one end of 5th inductance L 5, the negative electrode of the second diode D2 is connected, the anode of the second diode D2 is connected with the second IGBT module S2 collector electrode, the emitter of the second IGBT module S2 connects the negative electrode of the second electrochemical capacitor E2.
Cutting torch circuit 3 described in the utility model comprises workpiece 31 and cutting torch 32, and workpiece 21 is connected with the other end of the 5th inductance L 5 in late-class circuit 2, and cutting torch 32 is connected with the anode of the second diode D2, the collector electrode of the second IGBT module S2 in late-class circuit 2.
The present embodiment adopts described front stage circuits 1, late-class circuit 2 and cutting torch circuit 3 to realize the repertoire of wide region plasma cutting machine current source, described front stage circuits 1 obtains the direct voltage close to net voltage crest value after filter rectification, as net voltage crest value, and obtain the net side power factor being greater than 0.96, described late-class circuit 2 obtains the direct current of wide range output after BUCK DC-DC converts, as cutting current 30A-200A, described cutting torch circuit 3 completes the thermal cutting to metal tube sheets material;
In this example: AC-input voltage wide region, 380V ± 15%, power frequency 50Hz or 60Hz, nominal input voltage 380VAC, specified output dc voltage mean value 150V, specified output direct current 130A, input power is 22kW.
Meanwhile, in order to Optimal Parameters design, at rated loads, the pressure drop that in LC filter, filtered electrical is dared to cause is not higher than 3% of net pressure, filter capacitor value is not easily excessive, and guarantee that rated condition off line side power factor is not less than 0.96, the Capacity Selection of the first electrochemical capacitor is not easily too small.In order to reduce the size of inductance used, electric capacity in late-class circuit and applicable high duty ratio requirement, higher chopping frequency and IGBT module fast should be selected.
Each device selected parameter is as follows:
IGBT chopping frequency: 20kHz.
Filter inductance L1-L3:2.0mH, 40A.
Filter capacitor C1-C3:2.0 μ F, 660V.
Three-phase commutation bridge B1:1200V, 200A/100 DEG C.
Resistance R1:100k Ω, 10W.
First electrochemical capacitor E1: single only 6800 μ F/450V, two and after two strings again, amount to four.
Second electrochemical capacitor E2: single only 6800 μ F/450V, in parallel, amount to four.
First IGBT module S1 and the first diode D1:1200V, 200A/100 DEG C, single brachium pontis IGBT module.
Second IGBT module S2 and the second diode D2:1200V, 200A/100 DEG C, single brachium pontis IGBT module.
4th inductance L 4: smoothing reactor, 1.0mH, 65A, 0.2mm, silicon steel sheet.
5th inductance L 5: smoothing reactor, 2.0mH, 65A, 0.2mm, silicon steel sheet.
Those skilled in the art will be contributed to described in above embodiment and understand the utility model further, but not limit the utility model in any form.It should be pointed out that to those skilled in the art, without departing from the concept of the premise utility, some distortion and improvement can also be made.These all belong to protection range of the present utility model.
Claims (3)
1. wide region plasma cutting machine current source, comprise front stage circuits, late-class circuit and cutting torch circuit, described front stage circuits comprises three-phase LC filter and three-phase rectifier, described three-phase LC filter comprises the first inductance, second inductance, 3rd inductance, first electric capacity, second electric capacity, 3rd electric capacity, wherein one end of the first inductance is connected with the live wire Ua of three-phase alternating-current supply, the a phase input of the other end and rectifier bridge in three-phase rectifier, one end of first electric capacity is connected, one end of second inductance is connected with the live wire Ub of three-phase alternating-current supply, the b phase input of the other end and rectifier bridge in three-phase rectifier, one end of second electric capacity is connected, one end of 3rd inductance is connected with the live wire Uc of three-phase alternating-current supply, the c phase input of the other end and three-phase commutation bridge in three-phase rectifier, one end of 3rd electric capacity is connected, first electric capacity, second electric capacity is connected with the other end of the 3rd electric capacity, described three-phase rectifier is made up of three-phase commutation bridge, resistance and the first electrochemical capacitor, the wherein positive pole of three-phase commutation bridge first resistance in parallel with between negative pole and the first electrochemical capacitor, described late-class circuit comprises a BUCK DC-DC converter, the 2nd BUCK DC-DC converter, and a described BUCK DC-DC converter is connected with the 2nd BUCK DC-DC converter.
2. wide region plasma cutting machine current source according to claim 1, it is characterized in that: a described BUCK DC-DC converter comprises the first diode, the 4th inductance, the first IGBT module and the second electrochemical capacitor, the 2nd BUCK DC-DC converter comprises the second diode, the second IGBT module and the 5th inductance; Wherein in one end of negative electrode and the 4th inductance of the first diode, front stage circuits, the positive pole of the first electrochemical capacitor is connected, the anode of the first diode is connected with the collector electrode of the negative electrode of the second electrochemical capacitor, the first IGBT module, the emitter of the first IGBT module connects the negative pole of the first electrochemical capacitor, the other end of the 4th inductance is connected with the anode of the second electrochemical capacitor, one end of the 5th inductance, the negative electrode of the second diode, the anode of the second diode is connected with the second IGBT module collector electrode, and the emitter of the second IGBT module connects the negative electrode of the second electrochemical capacitor.
3. wide region plasma cutting machine current source according to claim 2, it is characterized in that: described cutting torch circuit comprises workpiece and cutting torch, workpiece is connected with the other end of the 5th inductance in late-class circuit, and cutting torch is connected with the anode of the second diode in late-class circuit, the collector electrode of the second IGBT module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420811687.2U CN204349829U (en) | 2014-12-19 | 2014-12-19 | Wide region plasma cutting machine current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420811687.2U CN204349829U (en) | 2014-12-19 | 2014-12-19 | Wide region plasma cutting machine current source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204349829U true CN204349829U (en) | 2015-05-20 |
Family
ID=53233068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420811687.2U Active CN204349829U (en) | 2014-12-19 | 2014-12-19 | Wide region plasma cutting machine current source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204349829U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105763048A (en) * | 2016-04-15 | 2016-07-13 | 上海交通大学 | Buck convertor with series voltage-reducing current-increasing circuit |
| CN105915051A (en) * | 2016-04-15 | 2016-08-31 | 上海交通大学 | Dual buck converter of pre-posed buck current-doubling circuit |
| CN107947575A (en) * | 2017-12-14 | 2018-04-20 | 东北电力大学 | Modularization can the double Buck tandem cell charger main circuit topologies of connection in series-parallel |
-
2014
- 2014-12-19 CN CN201420811687.2U patent/CN204349829U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105763048A (en) * | 2016-04-15 | 2016-07-13 | 上海交通大学 | Buck convertor with series voltage-reducing current-increasing circuit |
| CN105915051A (en) * | 2016-04-15 | 2016-08-31 | 上海交通大学 | Dual buck converter of pre-posed buck current-doubling circuit |
| CN107947575A (en) * | 2017-12-14 | 2018-04-20 | 东北电力大学 | Modularization can the double Buck tandem cell charger main circuit topologies of connection in series-parallel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103722284B (en) | Crisscross parallel plasma cutting power supply | |
| CN211018677U (en) | Numerical control short arc direct current superposition pulse power supply | |
| CN102291014A (en) | Alternating-current chopping-full-bridge rectification AC-DC (alternating current-to-direct current) converter | |
| CN201699602U (en) | High power single circuit inverse soft switch arc welding power source | |
| CN204349829U (en) | Wide region plasma cutting machine current source | |
| CN102780409B (en) | Unity-power-factor buck-boost circuit | |
| CN202524315U (en) | DC/AC grid-connected inversion circuit | |
| CN102281010A (en) | High-power single-loop contravariance soft switching arc welding power supply | |
| CN204171514U (en) | A kind of high-performance high-frequency Inverter TIG Welding machine | |
| CN103078525A (en) | Alternative-current direct-current (AC-DC) converter based on exchange link technology | |
| CN104578455A (en) | Novel high-power wireless charging system and control method thereof | |
| CN102769394B (en) | Single-phase controllable rectification circuit | |
| CN103997230A (en) | Intermediate frequency furnace based on full-wave chopped mode rectifying circuits | |
| CN203725968U (en) | Multiple cascading chopping voltage reducing plasma cutting power supply | |
| CN105429452A (en) | Common-mode rejection dual-Boost bridgeless PFC converter | |
| CN204339113U (en) | Wide current plasma cutting machine current source | |
| CN205336138U (en) | Two boost voltage -multiplying PFC converters of high efficiency | |
| CN201726318U (en) | Non-DC link single-phase power electronic transformer | |
| CN205051585U (en) | Single phase alternating current contravariant three -phase AC's dc -to -ac converter | |
| CN201134675Y (en) | Bidirectional energy feedback series type active filter | |
| CN209001859U (en) | A kind of variable-frequency power sources based on photovoltaic power generation | |
| CN102324860B (en) | Direct current chopping linear alternating current-direct current (AC-DC) converter | |
| CN105337515A (en) | High-efficiency double-Boost PFC converter | |
| CN102291036B (en) | Alternating-current push-pull conversion-full-bridge rectification step-down circuit | |
| CN205212701U (en) | Two boost of Z type do not have bridge PFC converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |