CN203725969U - High-power plasma cutting power supply - Google Patents
High-power plasma cutting power supply Download PDFInfo
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- CN203725969U CN203725969U CN201420036172.XU CN201420036172U CN203725969U CN 203725969 U CN203725969 U CN 203725969U CN 201420036172 U CN201420036172 U CN 201420036172U CN 203725969 U CN203725969 U CN 203725969U
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Abstract
The utility model relates to a high-power plasma cutting power supply which comprises a voltage reducing circuit (1), a chopper circuit (2) and a torch cutting circuit (3). The voltage reducing circuit (1) is an industrial frequency transformer which comprises a primary winding with a star connection wire and eight secondary windings with triangle connection wires. The chopper circuit (2) comprises four groups of BUCK circuits which are connected in parallel. The eight secondary windings with the triangle connection wires form four groups in a pairing mode to input the four groups of BUCK circuits respectively. According to the high-power plasma cutting power supply, supported output direct current can reach 650 A, the circuits are simple, control is convenient, meanwhile, an input power factor is high (above 0.96), and output direct current ripple is lower than 2%-5%.
Description
Technical field
The utility model relates to a kind of power supply, especially relates to a kind of high-power cutting power supply cutting for plasma, belongs to plasma cutting field and Technics of Power Electronic Conversion field.
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, 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 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 cutting torch horizontal movement precision, cutting torch move both vertically stability, precision of cutting current of precision, protection gas and cutting gas 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 source.Wherein, dc source quality comprises voltage-regulation coefficient 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 the capacitance that increases 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 " design and research of high power air plasma cutting power supply " that " He Wei army " delivered in " Nanjing Aero-Space University " in 2009; The master thesis " research of plasma cutting high-performance electric origin system " that " 5 is strong " delivered in " Nanjing Aero-Space University " in 2010; The former belongs to contravariant plasma cutting power supply, and power grade is difficult to promote; The latter two are only applicable to export DC current lower than the application scenario below 130A, and power grade can not exceed 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 high-power plasma cutting power supply is provided, its support output DC 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 DC current ripple is low.
The purpose of this utility model is achieved in that a kind of high-power 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 windings of eight delta connections, and described chopper circuit includes four groups of BUCK circuit parallel with one another; The secondary windings of above-mentioned eight delta connections between two one group form four groups and input respectively above-mentioned four groups of BUCK circuit.
The high-power plasma cutting power supply of the utility model, the three-phase alternating-current supply of the armature winding input 380V of star-star connection, the first phase of eight secondary windings of delta connection is respectively+52.5 ° ,+22.5 ° ,+37.5 ° ,+7.5 ° ,-7.5 ° ,-37.5 ° ,-22.5 ° and-52.5 °, output voltage is 220V;
Described chopper circuit includes a BUCK circuit, the 2nd BUCK circuit, the 3rd BUCK circuit and the 4th BUCK circuit;
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+52.5 ° with first phase respectively and is connected with the secondary windings of+22.5 °, between the positive-negative output end of described the first three-phase commutation bridge, be connected in parallel to the first power resistor and the first electrochemical capacitor, between the positive-negative output end of described the second three-phase commutation bridge, be connected in parallel to the second power resistor and the second electrochemical capacitor, the positive pole of described the first three-phase commutation bridge is connected with the colelctor electrode of an IGBT, the emitter stage of a described IGBT is through the first inductance access first node, and the emitter stage of an IGBT is connected with the negative pole of the first diode, the positive pole of described the first diode is connected with the negative pole of the first three-phase commutation bridge, the negative pole of described the first three-phase commutation bridge is connected with the positive pole of the second three-phase commutation bridge, the negative pole of described the second three-phase commutation bridge is connected with the emitter stage of the 2nd IGBT, the colelctor electrode access Section Point of described the 2nd IGBT, and the colelctor electrode of the 2nd IGBT is connected with the positive pole of the second diode, the negative pole of described the second diode is connected with the positive pole of the second three-phase commutation bridge,
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 is+37.5 ° with first phase respectively and is connected with the secondary windings of+7.5 °, between the positive-negative output end of described the 3rd three-phase commutation bridge, be connected in parallel to the 3rd power resistor and the 3rd electrochemical capacitor, between the positive-negative output end of described the 4th three-phase commutation bridge, be connected in parallel to the 4th power resistor and the 4th electrochemical capacitor, the positive pole of described the 3rd three-phase commutation bridge is connected with the colelctor electrode of the 3rd IGBT, the emitter stage of described the 3rd IGBT is through the second inductance access first node, and the emitter stage of the 3rd IGBT is connected with the negative pole of the 3rd diode, the positive pole of described the 3rd diode is connected with the negative pole of the 3rd three-phase commutation bridge, the negative pole of described the 3rd three-phase commutation bridge is connected with the positive pole of the 4th three-phase commutation bridge, the negative pole of described the 4th three-phase commutation bridge is connected with the emitter stage of the 4th IGBT, the colelctor electrode access Section Point of described the 4th IGBT, and the colelctor electrode of the 4th IGBT is connected with the positive pole of the 4th diode, the negative pole of described the 4th diode is connected with the positive pole of the 4th three-phase commutation bridge,
Described the 3rd BUCK circuit includes the 5th three-phase commutation bridge and the 6th three-phase commutation bridge, the input of the 5th three-phase commutation bridge and the 6th three-phase commutation bridge is-7.5 ° with first phase respectively and is connected with the secondary windings of-37.5 °, between the positive-negative output end of described the 5th three-phase commutation bridge, be connected in parallel to the 5th power resistor and the 5th electrochemical capacitor, between the positive-negative output end of described the 6th three-phase commutation bridge, be connected in parallel to the 6th power resistor and the 6th electrochemical capacitor, the positive pole of described the 5th three-phase commutation bridge is connected with the colelctor electrode of the 5th IGBT, the emitter stage of described the 5th IGBT is through the 3rd inductance access first node, and the emitter stage of the 5th IGBT is connected with the negative pole of the 5th diode, the positive pole of described the 5th diode is connected with the negative pole of the 5th three-phase commutation bridge, the negative pole of described the 5th three-phase commutation bridge is connected with the positive pole of the 6th three-phase commutation bridge, the negative pole of described the 6th three-phase commutation bridge is connected with the emitter stage of the 6th IGBT, the colelctor electrode access Section Point of described the 6th IGBT, and the colelctor electrode of the 6th IGBT is connected with the positive pole of the 6th diode, the negative pole of described the 6th diode is connected with the positive pole of the 6th three-phase commutation bridge,
Described the 4th BUCK circuit includes the 7th three-phase commutation bridge and the 8th three-phase commutation bridge, the input of the 7th three-phase commutation bridge and the 8th three-phase commutation bridge is-22.5 ° with first phase respectively and is connected with the secondary windings of-52.5 °, between the positive-negative output end of described the 7th three-phase commutation bridge, be connected in parallel to the 7th power resistor and the 7th electrochemical capacitor, between the positive-negative output end of described the 8th three-phase commutation bridge, be connected in parallel to the 8th power resistor and the 8th electrochemical capacitor, the positive pole of described the 7th three-phase commutation bridge is connected with the colelctor electrode of the 7th IGBT, the emitter stage of described the 7th IGBT is through the 4th inductance access first node, and the emitter stage of the 7th IGBT is connected with the negative pole of the 7th diode, the positive pole of described the 7th diode is connected with the negative pole of the 7th three-phase commutation bridge, the negative pole of described the 7th three-phase commutation bridge is connected with the positive pole of the 8th three-phase commutation bridge, the negative pole of described the 8th three-phase commutation bridge is connected with the emitter stage of the 8th IGBT, the colelctor electrode access Section Point of described the 8th IGBT, and the colelctor electrode of the 8th IGBT is connected with the positive pole of the 8th diode, the negative pole of described the 8th diode is connected with the positive pole of the 8th three-phase commutation bridge.
The high-power plasma cutting power supply of the utility model, above-mentioned the first three-phase commutation bridge, the second three-phase commutation bridge, the 3rd three-phase commutation bridge, the 4th three-phase commutation bridge, the 5th three-phase commutation bridge, the 6th three-phase commutation bridge, the 7th three-phase commutation bridge and the 8th three-phase commutation bridge are diode and do not control three-phase commutation bridge.
The high-power plasma cutting power supply of the utility model, described cutting torch circuit includes workpiece and cutting torch, and above-mentioned first node is connected with workpiece after the 5th inductance, and above-mentioned Section Point is connected with the negative pole of cutting torch.
Compared with prior art, the beneficial effects of the utility model are:
Compared with prior art, the utlity model has following beneficial effect:
(1) four group of BUCK circuit design, actual is that eight groups of power devices are shared whole power, is convenient to realize modularized design, can share general power equally, supports larger general power, cuts thicker workpiece;
(2) four 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 DC 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 windings out of phase simultaneously, reduces the harm of harmonic current.
Brief description of the drawings
Fig. 1 is the circuit structure sketch of the high-power plasma cutting power supply of the utility model.
Detailed description of the invention
Referring to Fig. 1, the high-power plasma cutting power supply of one 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 windings of eight delta connections (△ connects), and the three-phase alternating-current supply of the armature winding of star-star connection input 380V, the first phase of eight secondary windings of delta connection is respectively+52.5 ° ,+22.5 ° ,+37.5 ° ,+7.5 ° ,-7.5 ° ,-37.5 ° ,-22.5 ° and-52.5 °, output voltage is 220V;
Described chopper circuit 2 includes four groups of BUCK circuit parallel with one another;
Particularly: described chopper circuit 2 includes a BUCK circuit, the 2nd BUCK circuit, the 3rd BUCK circuit and the 4th 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+52.5 ° with first phase respectively and is connected with the secondary windings of+22.5 °, between the positive-negative output end of described the first three-phase commutation bridge B1, be connected in parallel to the first power resistor R1 and the first electrochemical capacitor E1, between the positive-negative output end of described the second three-phase commutation bridge B2, be connected in parallel to the second power resistor R2 and the second electrochemical capacitor E2, the positive pole of described the first three-phase commutation bridge B1 is connected with the colelctor electrode of an IGBTS1, the emitter stage of a described IGBTS1 accesses first node A through the first inductance L 1, and the emitter stage of an IGBTS1 is connected with the negative pole of the first diode D1, the positive pole of described the first diode D1 is connected with the negative pole of the first three-phase commutation bridge B1, the negative pole of described the first three-phase commutation bridge B1 is connected with the positive pole of the second three-phase commutation bridge B2, the negative pole of described the second three-phase commutation bridge B2 is connected with the emitter stage of the 2nd IGBTS2, the colelctor electrode access Section Point B of described the 2nd IGBTS2, and the colelctor electrode of the 2nd IGBTS2 is connected with the positive pole of the second diode D2, the negative pole of described the second diode D2 is connected with the positive pole of the second three-phase commutation bridge B2,
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+37.5 ° with first phase respectively and is connected with the secondary windings of+7.5 °, between the positive-negative output end of described the 3rd three-phase commutation bridge B3, be connected in parallel to the 3rd power resistor R3 and the 3rd electrochemical capacitor E3, between the positive-negative output end of described the 4th three-phase commutation bridge B4, be connected in parallel to the 4th power resistor R4 and the 4th electrochemical capacitor E4, the positive pole of described the 3rd three-phase commutation bridge B3 is connected with the colelctor electrode of the 3rd IGBTS3, the emitter stage of described the 3rd IGBTS3 accesses first node A through the second inductance L 2, and the emitter stage of the 3rd IGBTS3 is connected with the negative pole of the 3rd diode D3, the positive pole of described the 3rd diode D3 is connected with the negative pole of the 3rd three-phase commutation bridge B3, the negative pole of described the 3rd three-phase commutation bridge B3 is connected with the positive pole of the 4th three-phase commutation bridge B4, the negative pole of described the 4th three-phase commutation bridge B4 is connected with the emitter stage of the 4th IGBTS4, the colelctor electrode access Section Point B of described the 4th IGBTS4, and the colelctor electrode of the 4th IGBTS4 is connected with the positive pole of the 4th diode D4, the negative pole of described the 4th diode D4 is connected with the positive pole of the 4th three-phase commutation bridge B4,
Described the 3rd BUCK circuit includes the 5th three-phase commutation bridge B5 and the 6th three-phase commutation bridge B6, the input of the 5th three-phase commutation bridge B5 and the 6th three-phase commutation bridge B6 is-7.5 ° with first phase respectively and is connected with the secondary windings of-37.5 °, between the positive-negative output end of described the 5th three-phase commutation bridge B5, be connected in parallel to the 5th power resistor R5 and the 5th electrochemical capacitor E5, between the positive-negative output end of described the 6th three-phase commutation bridge B6, be connected in parallel to the 6th power resistor R6 and the 6th electrochemical capacitor E6, the positive pole of described the 5th three-phase commutation bridge B5 is connected with the colelctor electrode of the 5th IGBTS5, the emitter stage of described the 5th IGBTS5 accesses first node A through the 3rd inductance L 3, and the emitter stage of the 5th IGBTS5 is connected with the negative pole of the 5th diode D5, the positive pole of described the 5th diode D5 is connected with the negative pole of the 5th three-phase commutation bridge B5, the negative pole of described the 5th three-phase commutation bridge B5 is connected with the positive pole of the 6th three-phase commutation bridge B6, the negative pole of described the 6th three-phase commutation bridge B6 is connected with the emitter stage of the 6th IGBTS6, the colelctor electrode access Section Point B of described the 6th IGBTS6, and the colelctor electrode of the 6th IGBTS6 is connected with the positive pole of the 6th diode D6, the negative pole of described the 6th diode D6 is connected with the positive pole of the 6th three-phase commutation bridge B6,
Described the 4th BUCK circuit includes the 7th three-phase commutation bridge B7 and the 8th three-phase commutation bridge B8, the input of the 7th three-phase commutation bridge B7 and the 8th three-phase commutation bridge B8 is-22.5 ° with first phase respectively and is connected with the secondary windings of-52.5 °, between the positive-negative output end of described the 7th three-phase commutation bridge B7, be connected in parallel to the 7th power resistor R7 and the 7th electrochemical capacitor E7, between the positive-negative output end of described the 8th three-phase commutation bridge B8, be connected in parallel to the 8th power resistor R8 and the 8th electrochemical capacitor E8, the positive pole of described the 7th three-phase commutation bridge B7 is connected with the colelctor electrode of the 7th IGBTS7, the emitter stage of described the 7th IGBTS7 accesses first node A through the 4th inductance L 4, and the emitter stage of the 7th IGBTS7 is connected with the negative pole of the 7th diode D7, the positive pole of described the 7th diode D7 is connected with the negative pole of the 7th three-phase commutation bridge B7, the negative pole of described the 7th three-phase commutation bridge B7 is connected with the positive pole of the 8th three-phase commutation bridge B8, the negative pole of described the 8th three-phase commutation bridge B8 is connected with the emitter stage of the 8th IGBTS8, the colelctor electrode access Section Point B of described the 8th IGBTS8, and the colelctor electrode of the 8th IGBTS8 is connected with the positive pole of the 8th diode D8, the negative pole of described the 8th diode D8 is connected with the positive pole of the 8th three-phase commutation bridge B8,
Above-mentioned the first three-phase commutation bridge B8, the second three-phase commutation bridge B2, the 3rd three-phase commutation bridge B3, the 4th three-phase commutation bridge B4, the 5th three-phase commutation bridge B5, the 6th three-phase commutation bridge B6, the 7th three-phase commutation bridge B7 and the 8th three-phase commutation bridge B8 are diode and do not control three-phase commutation bridge;
Described cutting torch circuit 3 includes workpiece and cutting torch, and above-mentioned first node A is connected with workpiece after the 5th inductance L 5, and above-mentioned Section Point B is connected with the negative pole of cutting torch;
Operation principle of the present utility model is:
Adopt reduction voltage circuit 1, chopper circuit 2 and cutting torch circuit 3 to realize the repertoire of high-power plasma cutting power supply, described reduction voltage circuit 1 completes step-down and the PFC of alternating voltage, chopper circuit 2 completes eight groups of three-phase alternating voltages is converted to a road DC current, cutting torch circuit completes the cutting to workpiece, particularly:
Described reduction voltage circuit 1, Jiang Yi road three-phase alternating voltage 380V, be converted to the three-phase alternating voltage 220V of eight groups of isolation, differ is 15 °, in the time that rear class chopper circuit and cutting torch circuit 3 are worked, can obtain power factor in net side is more than 0.96 input current waveform, the reason that the secondary windings Wei Si road three-phase alternating voltage 220V of reduction voltage circuit 1 is set is: the floating voltage 311V obtaining is applicable to cutting torch circuit ionic medium cutting arc-striking and transferred arc, and in every group of secondary windings and each rear class chopper circuit, BUCK circuit can be shared 1/4 general power, be convenient to the modularized design of BUCK circuit in chopper circuit,
Described chopper circuit 2, comprise four 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 DC current, after two-way DC current converges through the effect of public smoothing reactor, obtain the synthetic DC current in a road, during in view of four road DC-dc conversions, IGBT driving pulse adopts staggered phase-shift PWM type of drive, basic phase shift angle is 90 °, i.e. 1/4 switch periods, make the ripple current of synthetic DC current lower, this electric current is by negative pole in workpiece and cutting torch, realize fine cut, simultaneously, in each BUCK circuit, do not control rectifier bridge and DC side parallel owing to adopting two groups of diode three-phases, form 12 pulse rectifiers, under the constant prerequisite of electrochemical capacitor capacitance, can obtain the more stable and lower DC voltage of ripple.
In above-mentioned detailed description of the invention:
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 530A, input power is 90kW;
IGBT chopping frequency: 20kHz;
Electrochemical capacitor E1 ~ E8:450V, 2200mF, four parallel connections;
Diode is not controlled three-phase commutation bridge B1 ~ B8:600V, 300A/100 ° of C;
Smoothing reactor L1 ~ L4:2.2mH, 130A, 0.35mm, silicon steel;
Smoothing reactor L5:1mH, 260A, 0.35mm, silicon steel;
IGBT and reverse fast recovery diode S1 and D1, S2 and D2, S3 and D3, S4 and D4, S5 and D5, S6 and D6, S7 and D7, S8 and D8:600V, 200A/100 ° of C, single brachium pontis IGBT module;
Power resistor R1 ~ R8:50k Ω, 5W;
Step-down transformer TR1:380V/8x220V, 100kVA.
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 amendment within the scope of the claims; this does not affect flesh and blood of the present utility model, all within the protection domain of this patent.
Claims (4)
1. a high-power plasma cutting power supply, described power supply includes reduction voltage circuit (1), chopper circuit (2) and cutting torch circuit (3), it is characterized in that: described reduction voltage circuit (1) is an Industrial Frequency Transformer, this Industrial Frequency Transformer includes the armature winding of a star-star connection and the secondary windings of eight delta connections, and described chopper circuit (2) includes four groups of BUCK circuit parallel with one another; The secondary windings of above-mentioned eight delta connections between two one group form four groups and input respectively above-mentioned four groups of BUCK circuit.
2. a kind of high-power plasma cutting power supply as claimed in claim 1, it is characterized in that: the three-phase alternating-current supply of the armature winding input 380V of star-star connection, the first phase of eight secondary windings of delta connection is respectively+52.5 ° ,+22.5 ° ,+37.5 ° ,+7.5 ° ,-7.5 ° ,-37.5 ° ,-22.5 ° and-52.5 °, output voltage is 220V;
Described chopper circuit (2) includes a BUCK circuit, the 2nd BUCK circuit, the 3rd BUCK circuit and the 4th 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+52.5 ° with first phase respectively and is connected with the secondary windings of+22.5 °, between the positive-negative output end of described the first three-phase commutation bridge (B1), be connected in parallel to the first power resistor (R1) and the first electrochemical capacitor (E1), between the positive-negative output end of described the second three-phase commutation bridge (B2), be connected in parallel to the second power resistor (R2) and the second electrochemical capacitor (E2), the positive pole of described the first three-phase commutation bridge (B1) and an IGBT(S1) colelctor electrode be connected, a described IGBT(S1) emitter stage through the first inductance (L1) access first node (A), an and IGBT(S1) emitter stage be connected with the negative pole of the first diode (D1), the positive pole of described the first diode (D1) is connected with the negative pole of the first three-phase commutation bridge (B1), the negative pole of described the first three-phase commutation bridge (B1) is connected with the positive pole of the second three-phase commutation bridge (B2), the negative pole of described the second three-phase commutation bridge (B2) and the 2nd IGBT(S2) emitter stage be connected, described the 2nd IGBT(S2) colelctor electrode access Section Point (B), and the 2nd IGBT(S2) colelctor electrode be connected with the positive pole of the second diode (D2), the negative pole of described the second diode (D2) is connected with the positive pole of the second three-phase commutation bridge (B2),
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+37.5 ° with first phase respectively and is connected with the secondary windings of+7.5 °, between the positive-negative output end of described the 3rd three-phase commutation bridge (B3), be connected in parallel to the 3rd power resistor (R3) and the 3rd electrochemical capacitor (E3), between the positive-negative output end of described the 4th three-phase commutation bridge (B4), be connected in parallel to the 4th power resistor (R4) and the 4th electrochemical capacitor (E4), the positive pole of described the 3rd three-phase commutation bridge (B3) and the 3rd IGBT(S3) colelctor electrode be connected, described the 3rd IGBT(S3) emitter stage through the second inductance (L2) access first node (A), and the 3rd IGBT(S3) emitter stage be connected with the negative pole of the 3rd diode (D3), the positive pole of described the 3rd diode (D3) is connected with the negative pole of the 3rd three-phase commutation bridge (B3), the negative pole of described the 3rd three-phase commutation bridge (B3) is connected with the positive pole of the 4th three-phase commutation bridge (B4), the negative pole of described the 4th three-phase commutation bridge (B4) and the 4th IGBT(S4) emitter stage be connected, described the 4th IGBT(S4) colelctor electrode access Section Point (B), and the 4th IGBT(S4) colelctor electrode be connected with the positive pole of the 4th diode (D4), the negative pole of described the 4th diode (D4) is connected with the positive pole of the 4th three-phase commutation bridge (B4),
Described the 3rd BUCK circuit includes the 5th three-phase commutation bridge (B5) and the 6th three-phase commutation bridge (B6), the input of the 5th three-phase commutation bridge (B5) and the 6th three-phase commutation bridge (B6) is-7.5 ° with first phase respectively and is connected with the secondary windings of-37.5 °, between the positive-negative output end of described the 5th three-phase commutation bridge (B5), be connected in parallel to the 5th power resistor (R5) and the 5th electrochemical capacitor (E5), between the positive-negative output end of described the 6th three-phase commutation bridge (B6), be connected in parallel to the 6th power resistor (R6) and the 6th electrochemical capacitor (E6), the positive pole of described the 5th three-phase commutation bridge (B5) and the 5th IGBT(S5) colelctor electrode be connected, described the 5th IGBT(S5) emitter stage through the 3rd inductance (L3) access first node (A), and the 5th IGBT(S5) emitter stage be connected with the negative pole of the 5th diode (D5), the positive pole of described the 5th diode (D5) is connected with the negative pole of the 5th three-phase commutation bridge (B5), the negative pole of described the 5th three-phase commutation bridge (B5) is connected with the positive pole of the 6th three-phase commutation bridge (B6), the negative pole of described the 6th three-phase commutation bridge (B6) and the 6th IGBT(S6) emitter stage be connected, described the 6th IGBT(S6) colelctor electrode access Section Point (B), and the 6th IGBT(S6) colelctor electrode be connected with the positive pole of the 6th diode (D6), the negative pole of described the 6th diode (D6) is connected with the positive pole of the 6th three-phase commutation bridge (B6),
Described the 4th BUCK circuit includes the 7th three-phase commutation bridge (B7) and the 8th three-phase commutation bridge (B8), the input of the 7th three-phase commutation bridge (B7) and the 8th three-phase commutation bridge (B8) is-22.5 ° with first phase respectively and is connected with the secondary windings of-52.5 °, between the positive-negative output end of described the 7th three-phase commutation bridge (B7), be connected in parallel to the 7th power resistor (R7) and the 7th electrochemical capacitor (E7), between the positive-negative output end of described the 8th three-phase commutation bridge (B8), be connected in parallel to the 8th power resistor (R8) and the 8th electrochemical capacitor (E8), the positive pole of described the 7th three-phase commutation bridge (B7) and the 7th IGBT(S7) colelctor electrode be connected, described the 7th IGBT(S7) emitter stage through the 4th inductance (L4) access first node (A), and the 7th IGBT(S7) emitter stage be connected with the negative pole of the 7th diode (D7), the positive pole of described the 7th diode (D7) is connected with the negative pole of the 7th three-phase commutation bridge (B7), the negative pole of described the 7th three-phase commutation bridge (B7) is connected with the positive pole of the 8th three-phase commutation bridge (B8), the negative pole of described the 8th three-phase commutation bridge (B8) and the 8th IGBT(S8) emitter stage be connected, described the 8th IGBT(S8) colelctor electrode access Section Point (B), and the 8th IGBT(S8) colelctor electrode be connected with the positive pole of the 8th diode (D8), the negative pole of described the 8th diode (D8) is connected with the positive pole of the 8th three-phase commutation bridge (B8).
3. a kind of high-power plasma cutting power supply as claimed in claim 2, is characterized in that: above-mentioned the first three-phase commutation bridge (B8), the second three-phase commutation bridge (B2), the 3rd three-phase commutation bridge (B3), the 4th three-phase commutation bridge (B4), the 5th three-phase commutation bridge (B5), the 6th three-phase commutation bridge (B6), the 7th three-phase commutation bridge (B7) and the 8th three-phase commutation bridge (B8) are diode and do not control three-phase commutation bridge.
4. a kind of high-power plasma cutting power supply as described in claim 2 or 3, it is characterized in that: described cutting torch circuit (3) includes workpiece and cutting torch, above-mentioned first node (A) is connected with workpiece after the 5th inductance (L5), and above-mentioned Section Point (B) is connected with the negative pole of cutting torch.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106624303A (en) * | 2016-12-16 | 2017-05-10 | 成都华远电器设备有限公司 | Inverter type high-power power supply for fine plasma cutting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106624303A (en) * | 2016-12-16 | 2017-05-10 | 成都华远电器设备有限公司 | Inverter type high-power power supply for fine plasma cutting |
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