CN203261232U - Chopper-type power supply circuit for plasma arc cutting - Google Patents
Chopper-type power supply circuit for plasma arc cutting Download PDFInfo
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- CN203261232U CN203261232U CN2013202304089U CN201320230408U CN203261232U CN 203261232 U CN203261232 U CN 203261232U CN 2013202304089 U CN2013202304089 U CN 2013202304089U CN 201320230408 U CN201320230408 U CN 201320230408U CN 203261232 U CN203261232 U CN 203261232U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Abstract
The utility model discloses a chopper-type power supply circuit for plasma arc cutting. The power supply circuit comprises a multi-winding transformer, at least two rectification circuits and at least two chopper circuits. The multi-winding transformer includes an input winding and at least two output windings, wherein the input winding is a star winding or a triangular winding; and one of the two output windings is a star winding, while the other one is a triangular winding. The output windings are used for connecting with a three-phase power supply, and are connected with the two rectification circuits respectively. The two rectification circuits are connected with the two chopper circuits respectively. According to the utility model, a 12 pulse wave rectification module is formed by an alternating-current power source, a multi-winding transformer and four rectification circuits; 12 pulse wave rectification is achieved by the Y/delta combination of the secondary windings of the multi-winding transformer; and the 12 pulse wave rectification enables the input current of the cutting power supply to have the same phase with the voltage of the power grid, so that the distortion of the circuit waveform is reduced, the power factor of the cutting power supply is increased, and the influence of the current harmonic waves on the power grid is reduced.
Description
Technical field
The utility model belongs to the Plasma Arc Cutting Technology field, more specifically, relates to a kind of power circuit of chopped mode plasma arc cutting.
Background technology
Air plasma arc cutting is a kind of thermal cutting technology, utilizes the high temperature of plasma arc will be cut metal local melting and evaporation, simultaneously by the high speed plasma air-flow molten metal mother metal that blows off, thereby forms narrow otch.The plasma arc column temperature is high, considerably beyond the fusing point of all metals, can cut any black and nonferrous materials, and the scope of application is wide.
The plasma arc cutting power supply is as the core of plasma cutting machines, and is more and more higher to the requirement of power supply, and except having the constant-current source characteristic of suddenly falling, requirements for power supply power is larger, and satisfied cutting is the demand of thick metal plate more; " green " electricity consumption of power-supply device energy reduces the harmonic pollution to electrical network.
Traditional cutting power supply is mainly take silicon rectifier and SCR controlled rectifier as main, the huge heaviness of equipment volume, and static and dynamic performance is also not ideal enough.Along with the raising of power electronic element performance and control technology, the plasma arc cutting power supply has had very great development, in all kinds of New Topologicals, chopped mode has simple in structure, and power is large, and switching frequency is high, control characteristic is good, and the advantage that reliability is high obtains a wide range of applications.But chopped mode usually by three-phase alternating current through the Industrial Frequency Transformer step-down, after not controlling rectification, employing do not obtain direct voltage on filter capacitor, carry out high frequency chopping by the IGBT switching tube, obtain the continuous current of characteristic good after high-power inductance filtering, supply with arc cutting.
Because chopped mode cutting power supply input AC electricity is not control rectifier system, this rectification circuit only just has the input of electric current during greater than capacitance voltage at the absolute value of input voltage, thereby make input current become a kind of discontinuous waveform that is approximately pulsed, power factor is low, and this wave distortion is serious, contain a large amount of harmonic componentss, electrical network is caused harmonic pollution.
Present grade mostly is 30～200A from the cutting power supply output current, and general power can not satisfy the requirement of cutting heavy-gauge sheeting below 30KW.
The utility model content
For the defective of prior art, the utility model provides a kind of power circuit of chopped mode plasma arc cutting, be intended to solve the power circuit power factor that prior art provides low, contain a large amount of harmonic componentss and can cause to electrical network the problem of harmonic pollution.
For achieving the above object, the utility model provides a kind of power circuit of chopped mode plasma arc cutting, comprises multi winding transformer, two-way rectification circuit and two-way chopper circuit at least at least; Described multi winding transformer comprises one group of input winding and at least two groups output winding, and described input winding is star winding or delta windings, and in two groups of output windings, one group of output winding is star winding, and another group output winding is delta windings; Described input winding is used for connecting three phase mains, and described two groups of output windings connect respectively the two-way rectification circuit, and the two-way rectification circuit connects respectively the two-way chopper circuit, and the output-parallel of two-way chopper circuit also is used for connecting load.
Further, two groups of output winding three-phase alternating voltage phase differences are 30 degree; The phase voltage of one group of output winding is exported the phase voltage of winding for another group
Doubly.
The utility model also provides a kind of power circuit of chopped mode plasma arc cutting, comprises multi winding transformer, No. four rectification circuits and No. four chopper circuits; Described multi winding transformer comprises one group of input winding and four groups of output windings, described input winding is star winding or delta windings, in four groups of output windings, the first output winding is delta windings, the second output winding is star winding, the 3rd output winding is delta windings, and the 4th output winding is star winding; Described input winding is used for connecting three phase mains, and the first output winding connects the first rectification circuit, and the first rectification circuit connects the first chopper circuit; The second output winding connects the second rectification circuit, and the second rectification circuit connects the second chopper circuit; The 3rd output winding connects the 3rd rectification circuit, and the 3rd rectification circuit connects the 3rd chopper circuit; The 4th output winding connects the 4th rectification circuit, and the 4th rectification circuit connects the 4th chopper circuit; The output-parallel of the first chopper circuit, the second chopper circuit, the 3rd chopper circuit and the 4th chopper circuit and be used for to connect load.
Further, the three-phase alternating voltage phase difference between described the first output winding and described the second output winding is 30 degree; Three-phase alternating voltage phase difference between described the 3rd output winding and described the 4th output winding is 30 degree.
Further, the phase voltage of described the first output winding is the phase voltage of the second output winding
Doubly; The phase voltage of described the 3rd output winding is the phase voltage of the 4th output winding
Doubly.
Further, in described star winding, the c1 end of the b1 end of the a1 of a phase winding end, b phase winding and c phase winding is connected.
Further, in described delta windings, the b2 end of the a1 of a phase winding end and b phase winding is connected, and the b1 end of b phase winding and the c2 end of c phase winding are connected, and the c1 end of c phase winding and the a2 end of a phase winding are connected.
Further, described rectification circuit comprises rectifier bridge module, and the energy storage filter capacitor C1 that is connected in parallel on described rectifier bridge module output.
Further, described rectifier bridge module comprises: the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5 and the 6th diode D6; The forward of described the first diode D1 is connected with the negative sense of described the second diode D2; The forward of described the 3rd diode D3 be connected the negative sense of the 4th diode D4 and connect; The forward of described the 5th diode D5 be connected the negative sense of the 6th diode D6 and connect; Three tie points are the input of described rectifier bridge module; The negative sense of described the first diode D1; The negative sense of the negative sense of described the 3rd diode D3 and described the 5th diode D5 rear positive output end as described rectifier bridge module that is connected; The forward of described the second diode D2; The forward of the forward of described the 4th diode D4 and described the 6th diode D6 rear negative output terminal as described rectifier bridge module that is connected.
Further, described chopper circuit comprises switching tube K1, sustained diode 15, anti-and diode D16 and out put reactor L1; The end of described out put reactor L1 is as the positive input terminal of described chopper circuit, the other end of described out put reactor L1 is as the positive output end of described chopper circuit, the base stage of described switching tube K1 connects outside pwm signal, the collector electrode of described switching tube K1 is connected to the anode of sustained diode 15, the collector electrode of described switching tube K1 is also as the negative output terminal of described chopper circuit, and the emitter of described switching tube K1 is as the negative input end of described chopper circuit; The negative electrode of described sustained diode 15 is connected to the end of described out put reactor L1; The described anti-also negative electrode of diode D16 is connected to the collector electrode of described switching tube K1, and the anodic bonding of described anti-also diode D16 is to the emitter of described switching tube K1.
In the utility model, alternating current source, multi winding transformer and No. four rectification circuits form 12 pulse wave rectifier modules; Constitute 12 pulse wave rectifiers according to the Y/ Δ of many windings transformation secondary winding; Make the input current of cutting power supply identical with electric network voltage phase due to 12 pulse wave rectifiers, the distortion of current waveform improves, thereby improve the power factor of cutting power supply, reduce current harmonics to the impact of electrical network, simultaneously, the multiple secondary winding of transformer secondary is well suited for the rear class chopper and adopts modularized design, the parallel operation mode improves the complete machine power grade.
Description of drawings
Fig. 1 is the structural representation of the power circuit of the chopped mode plasma arc cutting that provides of the utility model;
Fig. 2 is transformer star winding connection diagram in the power circuit of the chopped mode plasma arc cutting that provides of the utility model;
Fig. 3 is transformer triangle winding connection diagram in the power circuit of the chopped mode plasma arc cutting that provides of the utility model;
Fig. 4 is the structural representation of rectification circuit in the power circuit of the chopped mode plasma arc cutting that provides of the utility model;
Fig. 5 is the structural representation of chopper circuit in the power circuit of the chopped mode plasma arc cutting that provides of the utility model;
Fig. 6 is the input current waveform schematic diagram that in prior art, tradition is not controlled rectification;
Fig. 7 is the input current waveform figure of 12 pulse wave rectifiers of the power circuit of the chopped mode plasma arc cutting that provides of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
The utility model is low for the power factor that traditional chopped mode plasma arc cutting power supply exists, and the shortcoming that harmonic content is large has proposed a kind of circuit of 12 pulse wave rectifiers, improves the power factor of cutting power supply, reduces current harmonics; For the lower situation of present plasma cutting power supply power grade, the utility model has adopted the modularized design of rear class chopper, utilizes the design feature of the many windings of transformer secondary, by module parallel operation mode, enlarges the power grade of complete machine.
The power circuit of the chopped mode plasma arc cutting that the utility model provides comprises multi winding transformer, two-way rectification circuit and two-way chopper circuit at least at least; Wherein, multi winding transformer comprises one group of input winding and at least two groups output winding, and the input winding is star winding or delta windings, and in two groups of output windings, one group of output winding is star winding, and another group output winding is delta windings; The input winding be used for to connect three phase mains, and two groups of output windings connect respectively the two-way rectification circuit, and the two-way rectification circuit connects respectively the two-way chopper circuit, the output-parallel of two-way chopper circuit and be used for connecting load.
In plasma cutting power supply circuit of the present utility model, the secondary winding of multi winding transformer has adopted the combination of Y/ Δ, together with rectification circuit that they connect separately, consists of 12 pulse wave rectifiers.Than traditional rectifier system of not controlling, 12 pulse wave rectifiers make the distortion of the input current waveform of cutting power supply improve, and reduce current harmonics to the impact of electrical network.In addition, adopted the structure of many output winding due to the secondary of multi winding transformer, be fit to very much the modularized design of chopper circuit, the power grade of power supply that can be as required, the quantity of flexible configuration copped wave power model realizes the cutting current output of high-power grade.Chopper circuit adopts modularized design, makes plasma power supply have better consistency, facilitates power supply production and maintenance work.
For convenience of explanation, existing take No. four rectification circuits and No. four chopper circuits as example and details are as follows by reference to the accompanying drawings:
As shown in Figure 1, the power circuit of chopped mode plasma arc cutting comprises multi winding transformer 200, No. four rectification circuits 206,207,208,209 and No. four chopper circuits 210,211,212,213; Wherein multi winding transformer 200 comprises one group of input winding 201 and four groups of output windings 202,203,204,205, input winding 201 is star winding or delta windings, in four groups of output windings, the first output winding 202 is delta windings, the second output winding 203 is star winding, the 3rd output winding 204 is delta windings, and the 4th output winding 205 is star winding; Input winding 201 is used for connecting the 380V three phase mains, and the first output winding 202 connects the first rectification circuit 206, the first rectification circuits 206 and connects the first chopper circuit 210; The second output winding 203 connects the second rectification circuit 207, the second rectification circuits 207 and connects the second chopper circuit 211; The 3rd output winding 204 connects the 3rd rectification circuit 208, the three rectification circuits 208 and connects the 3rd chopper circuit 212; The 4th output winding 205 connects the 4th rectification circuit 209, the four rectification circuits 209 and connects the 4th chopper circuit 213; The output-parallel of the first chopper circuit 210, the second chopper circuit 211, the 3rd chopper circuit 212 and the 4th chopper circuit 213 and be used for to connect load.
In the utility model embodiment, alternating current source, multi winding transformer and No. four rectification circuits form 12 pulse wave rectifier modules; Y/ Δ combination according to many windings transformation secondary winding consists of 12 pulse wave rectifiers; No. four chopper circuit structures are identical, by high-power switch tube, and fly-wheel diode, filter inductance forms, the direct voltage that respectively four tunnel rectifications is obtained carries out high frequency chopping, obtains the continuous current of steep drop characteristic after filter inductance, supplies with the arc cutting load.Make the input current of cutting power supply identical with electric network voltage phase due to 12 pulse wave rectifiers, the distortion of current waveform improves, thereby improve the power factor of cutting power supply, reduce current harmonics to the impact of electrical network, simultaneously, the multiple secondary winding of transformer secondary is well suited for the rear class chopper and adopts modularized design, the parallel operation mode improves the complete machine power grade.
Power circuit of the present utility model, greater than 1/2 o'clock of rated current, two group of 12 pulse wave rectifier circuit and No. four chopper circuits were worked simultaneously at the output cutting current; When be less than or equal at the output cutting current rated current 1/2 the time, one group of 12 pulse wave rectifier circuit and corresponding two-way chopper circuit are only arranged in work; Another group 12 pulse wave rectifier circuit and corresponding two-way chopper circuit provide redundancy backup.
In the utility model embodiment, the former limit of multi winding transformer is one group of input winding; Connected mode by winding has two kinds, star (Y) connection and triangle (Δ) connection, claim that the winding of star (Y) connection is star winding, the winding of triangle (Δ) connection is delta windings, and existing in conjunction with Fig. 2 and Fig. 3 in detail the concrete connection of star (Y) connection and triangle (Δ) connection to be described in detail as follows:
As shown in Figure 2, star (Y) connection: the a1 end of a phase winding and the b1 end of b phase winding are connected with the c1 end of c phase winding simultaneously.Be that the a1 end of a phase winding in star winding, the b1 end of b phase winding and the c1 end of c phase winding are connected.
As shown in Figure 3, triangle (Δ) connection: the a1 end of a phase winding and the b2 end of b phase winding are connected, and the b1 end of b phase winding and the c2 end of c phase winding are connected, and the c1 end of c phase winding and the a2 end of a phase winding are connected.Be that the a1 end of a phase winding in delta windings and the b2 end of b phase winding are connected, the b1 end of b phase winding and the c2 end of c phase winding are connected, and the c1 end of c phase winding and the a2 end of a phase winding are connected.
The secondary of multi winding transformer 200 is four groups of windings of mutually isolating, two groups of Y connections wherein, another two groups of Δ connections.Connection is the same, does not repeat them here.The secondary delta windings of multi winding transformer 200 and the difference of star winding connection make winding three-phase alternating voltage phase shifting 30 degree of two kinds of connections.The phase voltage of multi winding transformer 200 secondary delta windings is the star winding phase voltage
Doubly, the output voltage of the secondary winding of such two kinds of connections equates.
Wherein, in four groups of windings of multi winding transformer secondary, by one group of star winding and one group of delta windings, form one group of 12 pulse wave rectifier circuit together with rectification circuit that they connect separately; Another group star winding and the group delta windings of being connected form another and organize 12 pulse wave rectifier circuit together with rectification circuit that they connect separately.
As shown in Figure 4, rectification circuit comprises rectifier bridge module, and the energy storage filter capacitor C1 that is connected in parallel on described rectifier bridge module output.Wherein, rectifier bridge module comprises: the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5 and the 6th diode D6; The forward of the first diode D1 is connected with the negative sense of the second diode D2; The negative sense of the forward of the 3rd diode D3 and the 4th diode D4 connects; The negative sense of the forward of the 5th diode D5 and the 6th diode D6 connects; Three tie points are the input of described rectifier bridge module; The negative sense of the first diode D1; The negative sense of the negative sense of the 3rd diode D3 and the 5th diode D5 rear positive output end as described rectifier bridge module that is connected; The forward of the second diode D2; The forward of the forward of the 4th diode D4 and the 6th diode D6 rear negative output terminal as described rectifier bridge module that is connected.
In the utility model embodiment, the winding 202 that is connected by Δ, the winding 203 that Y connects and the corresponding rectification circuit 206,207 that connects of being connected consist of one group of 12 pulse wave rectifier circuit 214 together; The winding 205 that the winding 204 that Δ connects, Y connect be connected the corresponding rectification circuit 208,209 that connects and consist of together another group 12 pulse wave rectifier circuit 215.12 pulse wave rectifiers are pulsed 12 times three-phase input current in each ac cycle, Harmonics of Input reduces greatly, has improved power factor.
As shown in Figure 5, chopper circuit comprises: switching tube K1, sustained diode 15, anti-and diode D16 and out put reactor L1; The end of described out put reactor L1 is as the positive input terminal of described chopper circuit, the other end of described out put reactor L1 is as the positive output end of described chopper circuit, the base stage of switching tube K1 connects outside pwm signal, the collector electrode of switching tube K1 is connected to the anode of sustained diode 15, the collector electrode of switching tube K1 is also as the negative output terminal of described chopper circuit, the emitter of switching tube K1 is connected to the negative output terminal of energy storage filter capacitor C1 and rectifier bridge module, and the negative electrode of sustained diode 15 is connected to the end of described out put reactor L1; Negative electrode anti-and diode D16 is connected to the collector electrode of switching tube K1, and the anodic bonding of anti-also diode D16 is to the emitter of switching tube K1.Chopper circuit obtains to such an extent that direct voltage carries out high frequency chopping to rectification, obtains the continuous current of steep drop characteristic after filter inductance, supplies with the arc cutting load.
Fig. 6 shows the input current waveform figure that tradition is not controlled rectification, this rectification circuit only just has the input of electric current during greater than capacitance voltage at the absolute value of input voltage, thereby make input current become a kind of discontinuous waveform that is approximately pulsed, power factor is low, and this wave distortion is serious, contain a large amount of harmonic componentss, electrical network is caused harmonic pollution.Fig. 7 shows the input current waveform figure of 12 pulse wave rectifiers of the chopped mode plasma arc cutting power circuit that the utility model embodiment provides, 12 pulse wave rectifiers make the input current of cutting power supply identical with electric network voltage phase, the distortion of current waveform improves, thereby improve the power factor of cutting power supply, reduce current harmonics to the impact of electrical network.
The power circuit of the chopped mode plasma arc cutting that the utility model provides is a kind of plasma cutting power supply of high-power grade, more than electric current reaches 400A, and the high-power cutting power supply of the supporting Digit Control Machine Tool of energy.For the little application scenario of complete machine power requirement, usually below the 250A electric current, can use the little transformer of rated capacity, secondary provides one group of star winding and one group of delta windings, two groups of corresponding modes that connect two-way copped wave module of winding; For the larger application scenario of complete machine power requirement, can adopt the transformer of high-power grade, secondary provides three groups of star windings and three groups of delta windings, the corresponding mode that connects six tunnel copped wave modules, consist of three group of 12 pulse wave rectifier circuit, both reach the effect of High Power Factor, improved again the power grade of complete machine.
Those skilled in the art will readily understand; the above is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (10)
1. the power circuit of a chopped mode plasma arc cutting, is characterized in that, comprises multi winding transformer, two-way rectification circuit and two-way chopper circuit at least at least;
Described multi winding transformer comprises one group of input winding and at least two groups output winding, and described input winding is star winding or delta windings, and in two groups of output windings, one group of output winding is star winding, and another group output winding is delta windings;
Described input winding is used for connecting three phase mains, and described two groups of output windings connect respectively the two-way rectification circuit, and the two-way rectification circuit connects respectively the two-way chopper circuit, and the output-parallel of two-way chopper circuit also is used for connecting load.
2. power circuit as claimed in claim 1, is characterized in that, two groups of output winding three-phase alternating voltage phase differences are 30 degree; The phase voltage of one group of output winding is exported the phase voltage of winding for another group
Doubly.
3. the power circuit of a chopped mode plasma arc cutting, is characterized in that, comprises multi winding transformer, No. four rectification circuits and No. four chopper circuits;
Described multi winding transformer comprises one group of input winding and four groups of output windings, described input winding is star winding or delta windings, in four groups of output windings, the first output winding is delta windings, the second output winding is star winding, the 3rd output winding is delta windings, and the 4th output winding is star winding;
Described input winding is used for connecting three phase mains, and the first output winding connects the first rectification circuit, and the first rectification circuit connects the first chopper circuit;
The second output winding connects the second rectification circuit, and the second rectification circuit connects the second chopper circuit;
The 3rd output winding connects the 3rd rectification circuit, and the 3rd rectification circuit connects the 3rd chopper circuit;
The 4th output winding connects the 4th rectification circuit, and the 4th rectification circuit connects the 4th chopper circuit;
The output-parallel of the first chopper circuit, the second chopper circuit, the 3rd chopper circuit and the 4th chopper circuit and be used for to connect load.
4. power circuit as claimed in claim 3, is characterized in that, the three-phase alternating voltage phase difference between described the first output winding and described the second output winding is 30 degree; Three-phase alternating voltage phase difference between described the 3rd output winding and described the 4th output winding is 30 degree.
5. power circuit as claimed in claim 3, is characterized in that, the phase voltage of described the first output winding is the phase voltage of the second output winding
Doubly; The phase voltage of described the 3rd output winding is the phase voltage of the 4th output winding
Doubly.
6. power circuit as described in claim 1 or 3, is characterized in that, in described star winding, the c1 end of the b1 end of the a1 of a phase winding end, b phase winding and c phase winding is connected.
7. power circuit as described in claim 1 or 3, it is characterized in that, in described delta windings, the b2 end of the a1 of a phase winding end and b phase winding is connected, and the b1 end of b phase winding and the c2 end of c phase winding are connected, and the c1 end of c phase winding and the a2 end of a phase winding are connected.
8. power circuit as described in claim 1 or 3, is characterized in that, described rectification circuit comprises rectifier bridge module, and the energy storage filter capacitor C1 that is connected in parallel on described rectifier bridge module output.
9. power circuit as claimed in claim 8, is characterized in that, described rectifier bridge module comprises: the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5 and the 6th diode D6;
The forward of described the first diode D1 is connected with the negative sense of described the second diode D2, the forward of described the 3rd diode D3 be connected the negative sense of the 4th diode D4 and connect, the forward of described the 5th diode D5 be connected the negative sense of the 6th diode D6 and connect, three tie points are the input of described rectifier bridge module;
The negative sense of the negative sense of the negative sense of described the first diode D1, described the 3rd diode D3 and described the 5th diode D5 rear positive output end as described rectifier bridge module that is connected;
The forward of the forward of the forward of described the second diode D2, described the 4th diode D4 and described the 6th diode D6 rear negative output terminal as described rectifier bridge module that is connected.
10. power circuit as described in claim 1 or 3, is characterized in that, described chopper circuit comprises switching tube K1, sustained diode 15, anti-and diode D16 and out put reactor L1.
The end of described out put reactor L1 is as the positive input terminal of described chopper circuit, and the other end of described out put reactor L1 is as the positive output end of described chopper circuit,
The base stage of described switching tube K1 connects outside pwm signal, the collector electrode of described switching tube K1 is connected to the anode of sustained diode 15, the collector electrode of described switching tube K1 is also as the negative output terminal of described chopper circuit, and the emitter of described switching tube K1 is as the negative input end of described chopper circuit; The negative electrode of described sustained diode 15 is connected to the end of described out put reactor L1,
The described anti-also negative electrode of diode D16 is connected to the collector electrode of described switching tube K1, and the anodic bonding of described anti-also diode D16 is to the emitter of described switching tube K1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202304089U CN203261232U (en) | 2013-04-28 | 2013-04-28 | Chopper-type power supply circuit for plasma arc cutting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202304089U CN203261232U (en) | 2013-04-28 | 2013-04-28 | Chopper-type power supply circuit for plasma arc cutting |
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| CN203261232U true CN203261232U (en) | 2013-10-30 |
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| CN2013202304089U Expired - Fee Related CN203261232U (en) | 2013-04-28 | 2013-04-28 | Chopper-type power supply circuit for plasma arc cutting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269170A (en) * | 2013-04-28 | 2013-08-28 | 华中科技大学 | Power circuit for chopped mode plasma arc cutting |
| CN103722283A (en) * | 2013-12-30 | 2014-04-16 | 江苏博大数控成套设备有限公司 | Direct stored energy control system of plasma-cutting power source and control method thereof |
-
2013
- 2013-04-28 CN CN2013202304089U patent/CN203261232U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269170A (en) * | 2013-04-28 | 2013-08-28 | 华中科技大学 | Power circuit for chopped mode plasma arc cutting |
| CN103722283A (en) * | 2013-12-30 | 2014-04-16 | 江苏博大数控成套设备有限公司 | Direct stored energy control system of plasma-cutting power source and control method thereof |
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