CN203734560U - Low-ripple plasma cutting power supply - Google Patents
Low-ripple plasma cutting power supply Download PDFInfo
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- CN203734560U CN203734560U CN201420036173.4U CN201420036173U CN203734560U CN 203734560 U CN203734560 U CN 203734560U CN 201420036173 U CN201420036173 U CN 201420036173U CN 203734560 U CN203734560 U CN 203734560U
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- 239000003990 capacitor Substances 0.000 claims description 11
- 238000013461 design Methods 0.000 description 6
- 238000009499 grossing Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910001423 beryllium ion Inorganic materials 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Abstract
The utility model relates to a low-ripple plasma cutting power supply. The power supply consists of a step-down circuit (1), a chopper circuit (2) and a cutting torch circuit (3). The step-down circuit (1) is a power frequency transformer; the power frequency transformer includes a star connection primary winding and four triangular connection secondary windings; the chopper circuit (2) includes a first BUCK circuit and a second BUCK circuit; the four triangular connection secondary windings are divided into two groups which are respectively sent to the first BUCK circuit and the second BUCK circuit and connected with the cutting torch circuit (3). The low-ripple plasma cutting power supply of the utility model supports the output DC current as big as the 650A; and the circuit is simple and easy to control, is high in input power factor (more than 0.96), and outputs the DC current ripple lower than 2 to 5%.
Description
Technical field
The utility model relates to a kind of power supply, especially relates to a kind of plasma cutting power supply that is applied to plasma cutting above and has low ripple advantage, belongs to plasma cutting field and Technics of Power Electronic Conversion field.
Background technology
Machine plasma cutter is comprised of plant equipment, control panel, air feed equipment etc., wherein control panel comprises power-supply system, digital control system, cutting torch system and ECAN bus, and power-supply system comprises again the major parts such as plasma cutting power supply, striking case, Pneumatic controlled box, cooling system, pipeline;
Plasma cutting power supply is one of core component of machine use plasma cutter, according to development course, can comprise various silicon rectifier formula power supply, SCR controlled rectifier power supply, contravariant power, chopped mode power supply.Wherein, contravariant power, chopped mode power supply are the most potential power supply machines.In view of holistic cost is lower and efficiency is higher, in high-power plasma cutter, chopped mode power supply is favored day by day, power circuit supports output current grade by 130A, 260A, 400A, 530A, 650A, 800,1000A, for cutting thicker sheet metal and tubing, power grade is also increased by the super 175kW direction of 22kW.Another aspect is also more and more higher to the quality requirement of metal works cutting.Affect the multiple because have of cut quality index, comprise that cutting torch horizontal movement precision, cutting torch move both vertically precision, protection gas and the cutting stability of gas, precision of cutting current etc.Only, with regard to cutting current, plasma cutting power supply output current precision and response speed are the important indicators that affects cut quality, and this is closely related with filter inductance sense value, switching frequency, line impedance, DC power supply.Wherein, DC power supply quality comprises voltage stability and ripple peak-to-peak value and ripple frequency, if these several indexs are poor, the ripple of cutting current will be larger, and cut quality is certainly poor.Need to improve these indexs for this reason, conventional means is for increasing the capacitance of electrochemical capacitor at present, but increase simply electrochemical capacitor capacitance and also can bring low-frequency oscillation and cost, volume problems of too, therefore, high-power design and output current become more meticulous be ion cutting power supply essential in the face of and the problem that solves;
For this reason, existing relevant scholar has carried out deep investigation to this: the master thesis " IGBT contravariant plasma cutting power supply " of delivering in " Lanzhou University of Science & Technology " in 2008 as " Chen Yaoling "; The master thesis that " He Wei army " delivered in " Nanjing Aero-Space University " in 2009 " design and research of high power air plasma cutting power supply "; The master thesis that " 5 is strong " delivered in " Nanjing Aero-Space University " in 2010 " research of plasma cutting high-performance electric origin system "; The former belongs to contravariant plasma cutting power supply, and power grade is difficult to promote; The latter two are only applicable to export direct current lower than the application scenario below 130A, and power grade can not surpass 30kW;
In sum, the circuit structure adopting for current plasma cutting power supply, even existing power circuit can not obtain the lower plasma cutting power supply of ripple current in essence.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned deficiency, a kind of low ripple plasma cutting power supply is provided, its support output direct current can reach 650A, and circuit is simple, control is convenient, has input power factor high (more than 0.96) simultaneously, exports the advantages such as direct current ripple is low.
The purpose of this utility model is achieved in that a kind of low ripple plasma cutting power supply, described power supply includes reduction voltage circuit, chopper circuit and cutting torch circuit, described reduction voltage circuit is an Industrial Frequency Transformer, this Industrial Frequency Transformer includes the armature winding of a star-star connection and the secondary winding of four delta connections, and described chopper circuit includes a BUCK circuit and the 2nd BUCK circuit; The secondary winding of four delta connections is divided into two groups and inputs respectively a BUCK circuit and be connected with cutting torch circuit with after the 2nd BUCK circuit.
The utility model low ripple plasma cutting power supply, described cutting torch circuit includes workpiece and cutting torch, a described BUCK circuit includes the first three-phase commutation bridge and the second three-phase commutation bridge, the input of the first three-phase commutation bridge and the second three-phase commutation bridge is connected with two groups of secondary winding respectively, described the first three-phase commutation bridge and the second three-phase commutation bridge positive-negative output end are also attached in node one and node two, between node one and node two, be connected in parallel to the first resistance, the second resistance and the first electrochemical capacitor, above-mentioned node one is connected with the collector electrode of an IGBT, the emitter of the one IGBT is through the first inductance access node three, and the emitter of an IGBT is connected with the negative pole of the first diode, the anodal access node two of described the first diode,
Described the 2nd BUCK circuit includes the 3rd three-phase commutation bridge and the 4th three-phase commutation bridge, the input of the 3rd three-phase commutation bridge and the 4th three-phase commutation bridge respectively other two groups of secondary winding is connected, described the 3rd three-phase commutation bridge and the 4th three-phase commutation bridge positive-negative output end are also attached in node four and node two, between node four and node two, be connected in parallel to the 3rd resistance, the 4th resistance and the second electrochemical capacitor, above-mentioned node one is connected with the collector electrode of the 2nd IGBT, the emitter of the 2nd IGBT is through the second inductance access node three, and the emitter of the 2nd IGBT is connected with the negative pole of the second diode, the anodal access node two of described the second diode.
The utility model low ripple plasma cutting power supply, described cutting torch circuit includes workpiece and cutting torch, the three-phase alternating-current supply of the armature winding input 380V of described star-star connection, the first phase of four secondary winding of delta connection is respectively+45 ° ,+15 ° ,-15 ° and-45 °, output voltage is 220V.
The utility model low ripple plasma cutting power supply, described cutting torch circuit includes workpiece and cutting torch, and described the first three-phase commutation bridge, the second three-phase commutation bridge, the 3rd three-phase commutation bridge and the 4th three-phase commutation bridge are diode and do not control three-phase commutation bridge.
The utility model low ripple plasma cutting power supply, described cutting torch circuit includes workpiece and cutting torch, and above-mentioned node three is electrically connected with workpiece after the 3rd inductance, and the negative pole of described cutting torch is connected with above-mentioned node two phase electricity.
Compared with prior art, the beneficial effects of the utility model are:
(1) two group of group BUCK circuit design, is convenient to realize modularized design, can share gross power equally, supports larger gross power, cuts thicker workpiece; (2) 2 groups of BUCK circuit adopt staggered phase shift type of drive, under public smoothing reactor effect, obtain cutting current meticulousr, that ripple is lower, realize accurate cutting; (3) 12 impulse commutations can obtain the lower and galvanic current of ripple and press, and guarantee that final cutting current is steadily smooth, eliminate the ripple of the cutting section that direct voltage ripple causes; (4) design of reduction voltage circuit, can meet the working power requirement of plasma cutting, and being designed with to be beneficial to and improving net side power factor of secondary winding out of phase, reduces the harm of harmonic current simultaneously.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the utility model low ripple plasma cutting power supply.
Embodiment
Referring to Fig. 1, a kind of low ripple plasma cutting power supply that the utility model relates to, described power supply includes reduction voltage circuit 1, chopper circuit 2 and cutting torch circuit 3,
Described reduction voltage circuit 1 is an Industrial Frequency Transformer, this Industrial Frequency Transformer includes the armature winding of a star-star connection (Y connects) and the secondary winding of four delta connections (△ connects), and the three-phase alternating-current supply of the armature winding of star-star connection input 380V, the first phase of four secondary winding of delta connection is respectively+45 ° ,+15 ° ,-15 ° and-45 °, output voltage is 220V;
Described chopper circuit 2 includes a BUCK circuit and the 2nd BUCK circuit;
A described BUCK circuit includes the first three-phase commutation bridge B1 and the second three-phase commutation bridge B2, the input of the first three-phase commutation bridge B1 and the second three-phase commutation bridge B2 is+45 ° with first phase respectively and is connected with the secondary winding of+15 °, described the first three-phase commutation bridge B1 and the second three-phase commutation bridge B2 positive-negative output end are also attached in node one A1 and node two C, between node one A1 and node two C, be connected in parallel to the first resistance R 1, the second resistance R 2 and the first electrochemical capacitor E1, above-mentioned node one A1 is connected with the collector electrode of an IGBTS1, the emitter of the one IGBTS1 is through the first inductance L 1 access node three D, and the emitter of an IGBTS1 is connected with the negative pole of the first diode D1, anodal access node two C of described the first diode D1,
Described the 2nd BUCK circuit includes the 3rd three-phase commutation bridge B3 and the 4th three-phase commutation bridge B4, the input of the 3rd three-phase commutation bridge B3 and the 4th three-phase commutation bridge B4 is-15 ° with first phase respectively and is connected with the secondary winding of-45 °, described the 3rd three-phase commutation bridge B3 and the 4th three-phase commutation bridge B4 positive-negative output end are also attached in node four A2 and node two C, between node four A2 and node two C, be connected in parallel to the 3rd resistance R 3, the 4th resistance R 4 and the second electrochemical capacitor E2, above-mentioned node one A2 is connected with the collector electrode of the 2nd IGBTS2, the emitter of the 2nd IGBTS2 is through the second inductance L 2 access node three D, and the emitter of the 2nd IGBTS2 is connected with the negative pole of the second diode D2, anodal access node two C of described the second diode D2,
The first three-phase commutation bridge B1, the second three-phase commutation bridge B2, the 3rd three-phase commutation bridge B3 and the 4th three-phase commutation bridge B4 are diode and do not control three-phase commutation bridge;
Described cutting torch circuit includes workpiece and cutting torch, and above-mentioned node three D are electrically connected with workpiece after the 3rd inductance L 3, and the negative pole of described cutting torch and above-mentioned node two C are electrically connected;
Operation principle of the present utility model is:
The utility model adopts reduction voltage circuit 1, chopper circuit 2 and cutting torch circuit 3 to realize the repertoire of low ripple plasma cutting power supply, described reduction voltage circuit 1 completes step-down and the power factor correction of alternating voltage, chopper circuit 2 completes four groups of three-phase alternating voltages is converted to a road direct current, cutting torch circuit completes the cutting to workpiece, particularly:
Described reduction voltage circuit 1, Jiang Yi road three-phase alternating voltage 380V, is converted to four groups of three-phase alternating voltage 220V that isolate, and differs 30 °, when rear class chopper circuit 2 and 3 work of cutting torch circuit, in net side, can obtain power factor is more than 0.96 input current waveform; The reason that the secondary winding Wei Si road three-phase alternating voltage 220V of reduction voltage circuit 1 is set is: resulting floating voltage 311V is applicable to cutting torch circuit ionic medium cutting arc-striking and transferred arc, and in every group of secondary winding and each rear class chopper circuit, BUCK circuit can be shared 1/2 gross power, is convenient to the modularized design of BUCK circuit in chopper circuit;
Described chopper circuit 2, comprise two groups of BUCK circuit, input respectively the three-phase alternating voltage 220V of out of phase, after not controlling three-phase commutation bridge, diode all obtains floating voltage 311V, after connect after DC-dc conversion, obtain separately a road direct current, after two-way direct current converges through the effect of public smoothing reactor, obtain the synthetic direct current in a road, during in view of two-way road DC-dc conversion, IGBT driving pulse adopts staggered phase-shift PWM type of drive, make the ripple current of synthetic direct current lower, this electric current is by negative pole in workpiece and cutting torch, realize fine cut, meanwhile, in each BUCK circuit, owing to adopting two groups of diode three-phases not control rectifier bridge and DC side parallel, form 12 pulse rectifiers, under the constant prerequisite of electrochemical capacitor capacitance, can obtain the more stable and lower direct voltage of ripple.
In this embodiment:
AC-input voltage wide region, 380V ± 15%, power frequency 50 Hz or 60Hz, specified input voltage 380VAC, specified output dc voltage mean value 150V, output-current rating 260A, input power is 45kW.
IGBT chopping frequency: 20kHz;
The first electrochemical capacitor E1 and the second electrochemical capacitor E2:450V, 2200mF, four parallel connections;
The first three-phase commutation bridge B1, the second three-phase commutation bridge B2, the 3rd three-phase commutation bridge B3 and the 4th three-phase commutation bridge B4: 600V, 300A/100 ° of C;
Smoothing reactor---the first inductance L 1 and the second inductance L 2:2.2mH, 130A, 0.35mm, silicon steel;
Smoothing reactor---the 3rd inductance L 3:1mH, 260A, 0.35mm, silicon steel;
The one IGBT S1 and the reverse fast recovery diode of the first diode D1(), the 2nd IGBTS2 and the reverse fast recovery diode of the second diode D2(): 600V, 200A/100 ° of C, single brachium pontis IGBT module;
The first resistance R 1(power resistor), the second resistance R 2(power resistor), the 3rd resistance R 3(power resistor) and the 4th resistance R 4(power resistor): 50k Ω, 5W;
Step-down transformer TR1---Industrial Frequency Transformer: 380V/4x220V, 50kVA.
It will be appreciated that; above specific embodiment of the utility model is described; the utility model is not limited to above-mentioned specific implementations; those skilled in the art can make various distortion or modification within the scope of the claims; this does not affect flesh and blood of the present utility model, all within the protection range of this patent.
Claims (5)
1. a low ripple plasma cutting power supply, described power supply includes reduction voltage circuit (1), chopper circuit (2) and cutting torch circuit (3), described reduction voltage circuit (1) is an Industrial Frequency Transformer, it is characterized in that: this Industrial Frequency Transformer includes the armature winding of a star-star connection and the secondary winding of four delta connections, described chopper circuit (2) includes a BUCK circuit and the 2nd BUCK circuit; The secondary winding of four delta connections is divided into two groups and inputs respectively a BUCK circuit and be connected with cutting torch circuit (3) after the 2nd BUCK circuit.
2. a kind of low ripple plasma cutting power supply as claimed in claim 1, it is characterized in that: a described BUCK circuit includes the first three-phase commutation bridge (B1) and the second three-phase commutation bridge (B2), the input of the first three-phase commutation bridge (B1) and the second three-phase commutation bridge (B2) is connected with two groups of secondary winding respectively, described the first three-phase commutation bridge (B1) and the second three-phase commutation bridge (B2) positive-negative output end are also attached in node one (A1) and node two (C), between node one (A1) and node two (C), be connected in parallel to the first resistance (R1), the second resistance (R2) and the first electrochemical capacitor (E1), above-mentioned node one (A1) and an IGBT(S1) collector electrode be connected, the one IGBT(S1) emitter is through the first inductance (L1) access node three (D), and an emitter IGBT(S1) is connected with the negative pole of the first diode (D1), the anodal access node two (C) of described the first diode (D1),
Described the 2nd BUCK circuit includes the 3rd three-phase commutation bridge (B3) and the 4th three-phase commutation bridge (B4), the input of the 3rd three-phase commutation bridge (B3) and the 4th three-phase commutation bridge (B4) is connected with other two groups of secondary winding respectively, described the 3rd three-phase commutation bridge (B3) and the 4th three-phase commutation bridge (B4) positive-negative output end are also attached in node four (A2) and node two (C), between node four (A2) and node two (C), be connected in parallel to the 3rd resistance (R3), the 4th resistance (R4) and the second electrochemical capacitor (E2), above-mentioned node one (A2) and the 2nd IGBT(S2) collector electrode be connected, the 2nd IGBT(S2) emitter is through the second inductance (L2) access node three (D), and emitter the 2nd IGBT(S2) is connected with the negative pole of the second diode (D2), the anodal access node two (C) of described the second diode (D2).
3. a kind of low ripple plasma cutting power supply as claimed in claim 2, it is characterized in that: the three-phase alternating-current supply of the armature winding input 380V of described star-star connection, the first phase of four secondary winding of delta connection is respectively+45 ° ,+15 ° ,-15 ° and-45 °, output voltage is 220V.
4. a kind of low ripple plasma cutting power supply as claimed in claim 2, is characterized in that: described the first three-phase commutation bridge (B1), the second three-phase commutation bridge (B2), the 3rd three-phase commutation bridge (B3) and the 4th three-phase commutation bridge (B4) are diode and do not control three-phase commutation bridge.
5. a kind of low ripple plasma cutting power supply as described in claim 2,3 or 4, it is characterized in that: described cutting torch circuit includes workpiece and cutting torch, above-mentioned node three (D) is electrically connected with workpiece after the 3rd inductance (L3), and the negative pole of described cutting torch and above-mentioned node two (C) are electrically connected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420036173.4U CN203734560U (en) | 2014-01-21 | 2014-01-21 | Low-ripple plasma cutting power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420036173.4U CN203734560U (en) | 2014-01-21 | 2014-01-21 | Low-ripple plasma cutting power supply |
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| CN203734560U true CN203734560U (en) | 2014-07-23 |
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| CN201420036173.4U Expired - Fee Related CN203734560U (en) | 2014-01-21 | 2014-01-21 | Low-ripple plasma cutting power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112436744A (en) * | 2020-11-17 | 2021-03-02 | 天津津航计算技术研究所 | Input power control circuit of transformer rectifier |
-
2014
- 2014-01-21 CN CN201420036173.4U patent/CN203734560U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112436744A (en) * | 2020-11-17 | 2021-03-02 | 天津津航计算技术研究所 | Input power control circuit of transformer rectifier |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140723 |