CN106208745B - Plasma cutting machine output current ripple frequency multiplication and modulating system - Google Patents
Plasma cutting machine output current ripple frequency multiplication and modulating system Download PDFInfo
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- CN106208745B CN106208745B CN201610643772.6A CN201610643772A CN106208745B CN 106208745 B CN106208745 B CN 106208745B CN 201610643772 A CN201610643772 A CN 201610643772A CN 106208745 B CN106208745 B CN 106208745B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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Abstract
The present invention provides a kind of plasma cutting machine output current ripple frequency multiplication and modulating system, including reduction voltage circuit, chopper circuit and cutting torch circuit, the chopper circuit includes two groups of BUCK circuits, and the workpiece to be processed after two groups of BUCK circuit output ends are in parallel with cutting torch circuit is connected.The present invention is by designing discontinuous sawtooth carrier wave, the on-off of respective four IGBT modules of the PWM drive signal control two-way BUCK circuit of equal duty ratio is generated in stable state, wherein 90 ° are successively differed per the IGBT module trigger sequence of BUCK circuit all the way, so that per DC current ripple quadruple all the way, two-way output differs 45 ° of certain angle according to actual condition, it complements each other so that the DC current output ripple octonary synthesized, ripple current amplitude further decrease.The present invention supports that output current ripple frequency multiplication, single tube IGBT stress are small, modularized design and can support High-current output, and control principle is clear, control signal occur it is simple.
Description
Technical field
The present invention relates to a kind of output current ripples in plasma cut field and Technics of Power Electronic Conversion field to cut down technology,
In particular it relates to a kind of plasma cutting machine output current ripple frequency multiplication and modulating system.
Background technique
" cutting and welding " is known as the title of " steel tailor ", and modern industry be unable to do without the cutting and welding of sheet metal, cuts
Cut be welding first working procedure, the height of the quality (flatness, smoothness) of cutting section, cutting efficiency and stock utilization
It is low all to directly affect welding quality (such as weld strength), production efficiency and cost, therefore, the development of modern industry, from not
Open the mental section cutting processing equipment of modernization.Currently, completing there are three types of the main methods that mental section is cut: flame, etc.
Ion, the big cutting mode of laser three, and plasma cut is efficient, at low cost, is that section steel cutting processes optimal selection, in work
The numerous areas of industry production is all widely used.
Plasma cutting power supply is one of the core component of machine plasma cutter, in view of overall cost it is lower and effect
Rate is higher, and in high powered plasma cutter device, chopped mode power supply is increasingly subject to favor, and power circuit supports output electric current etc.
Grade constantly increases.On the other hand, industry is to the quality of DC power supply (including voltage stability and ripple peak-to-peak value and ripple
Frequency) requirement it is also higher and higher, the demand of industry is no longer satisfied by passive device (increase capacitor and inductance) merely.
Therefore, high powe design and output current ripple high frequency are plasma cut DC source urgent problems to be solved.
By the retrieval to the plasma cutting machine output current ripple multiple-frequency modulation method prior art, discovery mainly have with
Lower representativeness document:
" design of plasma cutting machine DC current source " text proposes two-way BUCK output and improves plasma power supply function
The scheme of rate grade, but the direct current output ripple frequency of the circuit is higher, is not able to satisfy the output current precision of greater degree
It is required that." systematic research of plasma cut high-performance power supply " text proposes a kind of buffering BUCK converter to reduce voltage
Current break, but the unsuitable power supply as high power level, high-precision requirement plasma cutting machine of the circuit.
In summary, to being found after the retrieval of the plasma cutting machine output current ripple multiple-frequency modulation method prior art,
Existing control method lacks the control strategy that can effectively improve ripple frequency.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of plasma cutting machine output current ripples times
Frequency and modulating system, can effectively improve ripple frequency.
According to the first aspect of the invention, a kind of plasma cutting machine output current ripple frequency doubling system, including drop are provided
Volt circuit, chopper circuit and cutting torch circuit, in which: transformation of the reduction voltage circuit to complete three-phase alternating voltage；It is described to cut
Wave circuit is to synthesize stable DC stream all the way；The cutting torch circuit is to complete fine cut.
Preferably, the reduction voltage circuit includes an Industrial Frequency Transformer, in which: the Industrial Frequency Transformer three-phase primary windings
Input terminal be connected respectively with three-phase alternating-current supply 380V, secondary includes two groups 30 ° of difference of three-phase secondary windings 220V, three
The first phase of phase secondary windings is respectively that Y connects 0 ° and Δ connects 30 °.
Preferably, the chopper circuit includes two groups of BUCK circuits, is the first BUCK circuit and the 2nd BUCK circuit respectively,
Workpiece to be processed after first BUCK circuit, the 2nd BUCK circuit output end are in parallel with cutting torch circuit is connected.
The first BUCK circuit includes: that first diode does not control three-phase rectification bridge, the first electrolytic capacitor, the first power electricity
Resistance, the first IGBT module, the second IGBT module, third IGBT module, the 4th IGBT module, the first reversed fast recovery two pole of power
Pipe, the second reversed power diode, third restored fastly reversely restore power diode, the 4th reversed fast recovery power diode fastly
With the first flat wave inductance, in which: first diode do not control three-phase rectification bridge input be reduction voltage circuit in Y connect 0 ° of three-phase secondary around
Output Ua1, Ub1 and Uc1 of group, the direct current output anode and the first electrolytic capacitor that first diode does not control three-phase rectification bridge are just
Pole, one end of the first power resistor, the first reversed fast recovery power diode cathode, second reversely restore power diode yin fastly
Pole, third reversely restore fastly power diode cathode, the 4th it is reversed fast restore power diode cathode, the first flat wave inductance one
End is connected, and first diode does not control the direct current output cathode of three-phase rectification bridge and the cathode of the first electrolytic capacitor, the first power electricity
The other end of resistance, the emitter of the first IGBT module, the emitter of the second IGBT module, the emitter of third IGBT module,
The emitter of four IGBT modules is connected, the collector of the first IGBT module, the collector of the second IGBT module, third IGBT module
Collector, the 4th IGBT module collector and first reversed fast restore power diode anode, second reversed fast restore function
Rate diode anode, third reversely restore power diode anode fastly, the 4th reversed fast power diode anode that restores is connected, shape
At the cathode of DC power supply, the other end of the first flat wave inductance forms the anode of DC power supply；
The 2nd BUCK circuit includes: that the second diode does not control three-phase rectification bridge, the second electrolytic capacitor, the second power electricity
Resistance, the 5th IGBT module, the 6th IGBT module, the 7th IGBT module, the 8th IGBT module, the 5th reversed fast recovery two pole of power
Pipe, the 6th reversed fast recovery power diode, the 7th are reversely fast to restore power diode, the 8th reversed recovery power diode fastly
With the second smoothing reactor, in which: the three-phase input that the second diode does not control three-phase rectification bridge is that Δ connects 30 ° three in reduction voltage circuit
Output Ua2, Ub2 and Uc2 of phase secondary windings, the second diode do not control direct current output anode and the second electrolysis of three-phase rectification bridge
The anode of capacitor, one end of the second power resistor, the 5th reversed fast recovery power diode cathode, the 6th reversely restore power fastly
Diode cathode, the 7th reversed fast recovery power diode cathode, the 8th reversely restore power diode cathode, the second flat wave fastly
One end of inductance is connected, and the second diode does not control the direct current output cathode of three-phase rectification bridge and the cathode of the second electrolytic capacitor, the
The other end of two power resistors, the 5th IGBT module emitter, the 6th IGBT module emitter, the 7th IGBT module emitter,
8th IGBT module emitter, the 5th IGBT module collector, the 6th IGBT module collector, the 7th IGBT module collector,
8th IGBT module collector and the 5th reversed fast restore power diode anode, the 6th reversed fast restores power diode sun
Pole, the 7th reversed fast recovery power diode anode, the 8th reversed fast power diode anode that restores are connected, formation DC power supply
Cathode, the other end of the second flat wave inductance forms the anode of DC power supply；
The cutting torch circuit is connected with two output ends of two-way BUCK circuit, in which: workpiece one end to be processed with cut
The anode of wave circuit is connected, and the workpiece other end to be processed is connected with plasma column one end, the plasma column other end with cut
Torch touches mouth and internal electrode is connected, and the cathode of cutting torch circuit is connected with the cathode of chopper circuit.
According to the second aspect of the invention, a kind of tune of above-mentioned plasma cutting machine output current ripple frequency doubling system is provided
System processed, including filter unit, expectation electric current comparing unit, Fractional Order PID adjust unit, clipping unit, carrier wave comparing unit
With polarity judging unit, in which: carrier wave comparing unit includes the first~the 8th carrier wave comparing unit；Polarity judging unit includes the
One~the octupole property judging unit；
Cutting machine output current signal in resulting operation, i.e. the total current signal io of two-way BUCK circuit output are sampled,
It is sent into filter unit, the output electric current after filtering unit filters inputs expectation electric current comparing unit, expectation electric current comparing unit
The output electric current is subtracted each other to obtain current error with the corresponding expectation electric current for wishing actual output current, current error input point
Number rank PID adjusts unit, and Fractional Order PID adjusts unit and carries out proportional integral differential adjusting to current error, and Fractional Order PID is adjusted
The output of unit is connected with clipping unit, and clipping unit ensures that Fractional Order PID adjusts export-restriction between specified bound, prevents
Only there is overflow and underflow, the input that the output of clipping unit carries the~the eight carrier wave comparing unit as first is another
Input is respectively the first~the 8th carrier wave, is compared respectively, i.e., Fractional Order PID adjusts output compared with carrier wave carries out size,
8 tunnel results after comparing input the first~the octupole property judging unit respectively, and the first~the octupole property judging unit carries out polarity
Judge: 8 tunnel results after relatively are that timing exports high level, and 8 tunnel results after comparison export low level when being negative, the first~the
The output of octupole property judging unit generates the first~the 8th PWM drive signal, and eight PWM drive signals respectively drive BUCK circuit
In the first~the 8th IGBT module on-off, complete output voltage to export electric current transformation.
The present invention controls the on-off of eight IGBT modules of two-way BUCK circuit by the PWM drive signal of equal duty ratio,
90 ° are successively wherein differed per IGBT module trigger sequence all the way, so that per 4 frequency multiplication of DC current ripple all the way, two-way output
45 ° of certain angle are differed according to actual condition, is complemented each other so that 8 frequency multiplication of DC current output current ripple frequency synthesized,
Current ripples further decrease.
Compared with prior art, the present invention have it is following the utility model has the advantages that
(1) four IGBT modules of every road BUCK circuit use phase shifting control strategy, 90 ° of phase shift so that every road output electricity
4 frequency multiplication of flow liner wave；
(2) two-way BUCK circuit is complementary to one another, and 45 ° of phase shift, so that 8 frequency multiplication of output current ripple of output, exports electric current
Ripple is lower；
(3) eight IGBT modules share power output, can support High-current output and single tube power stress is small；
(4) four IGBT modules of every road BUCK circuit share a flat wave inductance, more save component and can reduce
Power volume；
(5) emitter of IGBT module connects on the cathode of rectifier output, so that the design of driving circuit is more convenient.
The present invention passes through equal duty ratio phase shifting control strategy, so that per output current ripple frequency multiplication all the way, and be effectively reduced
The ripple of synthesis output electric current, current ripples multiple frequence, single tube IGBT stress is small, modularized design and high current can be supported defeated
Out, have the advantages that control principle it is clear, control signal occur it is simple.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the frequency doubling system circuit diagram of one embodiment of the invention；
Fig. 2 is the modulating system schematic diagram of one embodiment of the invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
As shown in Figure 1, the present embodiment provides a kind of plasma cutting machine output current ripple multiple-frequency modulation system, including drop
Volt circuit 11, chopper circuit and cutting torch circuit 14, in which: transformation of the reduction voltage circuit to complete three-phase alternating voltage；Institute
Chopper circuit is stated to synthesize stable DC stream all the way；The cutting torch circuit is to complete fine cut.
As shown in Figure 1, the reduction voltage circuit 11 includes an Industrial Frequency Transformer, in which: at the beginning of the Industrial Frequency Transformer three-phase
The input terminal of grade winding is connected with three-phase alternating-current supply 380V respectively, and secondary includes two groups 30 ° of difference of three-phase secondary windings
220V, the first phase of three-phase secondary windings are respectively that Y connects 0 ° and Δ connects 30 °, are changed for realizing the voltage of 380V-220V.
As shown in Figure 1, the chopper circuit includes two groups of BUCK circuits, it is the first BUCK circuit 12 and the 2nd BUCK respectively
Circuit 13；
The first BUCK circuit 12 includes: that a diode does not control three-phase rectification bridge B1, an electrolytic capacitor E1, one
Power resistor R1, four IGBT module S1-S4, a four reversed fast recovery power diode D1-D4 and smoothing reactor L1,
Wherein: diode does not control the output that the three-phase input of three-phase rectification bridge B1 connects 0 ° of three-phase secondary windings for Y in reduction voltage circuit 11
Ua1, ub1 and uc1, diode do not control the anode of the direct current output anode P1 and electrolytic capacitor E1 of three-phase rectification bridge B1, power electricity
One end, reversed fast recovery power diode D1-D4 cathode, the one end of flat wave inductance L1 for hindering R1 are connected, and diode does not control three-phase
The direct current output cathode N1 of rectifier bridge B1 and the cathode of electrolytic capacitor E1, the other end of power resistor R1, IGBT module S1-S4
Emitter is connected, and the collector of IGBT module S1-S4 is connected with the reversed fast power diode D1-D4 anode that restores, and forms direct current
The cathode of power supply, the other end of flat wave inductance L1 form the anode of DC power supply；
The 2nd BUCK circuit 13 includes: that a diode does not control three-phase rectification bridge B2, an electrolytic capacitor E2, one
Power resistor R2, four IGBT module S5-S8, a four reversed fast recovery power diode D5-D8 and smoothing reactor L2,
Wherein: diode does not control the output that the three-phase input of three-phase rectification bridge B2 connects 30 ° of three-phase secondary windings for Δ in reduction voltage circuit 11
Ua2, ub2 and uc2, diode do not control the anode of the direct current output anode P2 and electrolytic capacitor E2 of three-phase rectification bridge B2, power electricity
One end, reversed fast recovery power diode D5-D8 cathode, the one end of flat wave inductance L2 for hindering R2 are connected, and diode does not control three-phase
The direct current output cathode N2 of rectifier bridge B2 and the cathode of electrolytic capacitor E2, the other end of power resistor R2, IGBT module S5-S8
Emitter is connected, and the collector of IGBT module S5-S8 is connected with the reversed fast power diode D5-D8 anode that restores, and forms direct current
The cathode of power supply, the other end of flat wave inductance L2 form the anode of DC power supply；
It is connected after first BUCK circuit, the 2nd BUCK circuit output end are in parallel with the workpiece of cutting torch circuit 14, wherein workpiece
It is connected with the anode of chopper circuit, the cathode of cutting torch circuit is connected with the cathode of chopper circuit.
As shown in Fig. 2, a kind of modulating system of above-mentioned frequency doubling system, by designing discontinuous sawtooth carrier wave, in stable state
When generate equal duty ratio PWM drive signal control two-way BUCK circuit respective four IGBT modules on-off, wherein each
The IGBT module trigger sequence of road BUCK circuit successively differs 90 °, so that per DC current ripple quadruple all the way, two-way is defeated
45 ° of certain angle are differed according to actual condition out, is complemented each other so that the DC current output ripple octonary synthesized, ripple electricity
Stream amplitude further decreases.
A kind of modulating system of above-mentioned frequency doubling system, including filter unit, expectation electric current comparing unit, Fractional Order PID tune
Save unit, clipping unit, carrier wave comparing unit (two inputs, 1,2 and output 3 of carrier wave comparing unit in Fig. 2), polarity
Judging unit and PWM generating unit, sampling gained current signal are sent into filter unit, output and the expectation electric current phase of filter unit
Subtract, gained current error inputs Fractional Order PID and adjusts unit, and the output that Fractional Order PID adjusts unit is connected with clipping unit, limits
The output of width unit is compared with carrier wave 1-8 respectively, and the result after comparing is connected with polarity judging unit 1-8 respectively, and polarity is sentenced
The output of disconnected unit 1-8 generates PWM1-8 respectively.The pwm control signal of first BUCK circuit 12 differs 90 ° respectively, specifically:
90 ° of advanced PWM3 of 90 ° of the advanced PWM2 of PWM1, PWM2,90 ° of the advanced PWM4 of PWM3, the output current ripple quadruple on the road；
The pwm control signal of 2nd BUCK circuit 13 differs 90 ° respectively, specifically: 90 ° of the advanced PWM6 of PWM5, the advanced PWM7 of PWM6
90 °, 90 ° of the advanced PWM8 of PWM7, the output current ripple quadruple on the road；PWM1 and PWM5 can phase according to circuit operation
A poor angle, the output electric current of two-way BUCK circuit are complementary to one another, so that the output electric current i of synthesisoRipple further subtract
It is small, to realize fine High-current output, meet the DC power supply requirement of plasma cutting machine.
In a certain embodiment, the type selecting and parameter of each device are as follows:
AC-input voltage wide scope, 380V ± 15%, power frequency 50Hz or 60Hz, nominal input voltage 380VAC are specified
Export DC voltage average value 150V, output-current rating 270A, input power 45kW；
IGBT chopping frequency: 20kHz；
Electrolytic capacitor E1-E2:450V, 6800 μ F, four parallel connections；
Diode does not control three-phase rectification bridge B1-B2:600V, and 300A/100 DEG C；
Smoothing reactor L1-L2:2.2mH, 130A, 0.35mm are thick, silicon steel；
IGBT module and it is reversed fast restore power diode S1 and D1, S2 and D2, S3 and D3, S4 and D4, S5 and D5, S6 with
D6, S7 and D7, S8 and D8:600V, 250A/100 DEG C, single bridge arm IGBT module；
Power resistor R1-R2:50k Ω, 5W；
Industrial Frequency Transformer TR1:380V/2x220V, 75kVA.
Key principle of the invention is:
(1) phase-shifting carrier wave actuation techniques, the driving signal of 4 IGBT modules is interlocked 90 ° in every road BUCK circuit, two-way
The driving signal of 8 IGBT modules is interlocked 45 ° in BUCK circuit, can be effectively reduced the size and reduction of every flat wave inductance
Current ripples；
(2) special carrier design, as shown in Fig. 2, in stable state, the generation of the driving signal of every IGBT module be by
Discontinuous sawtooth carrier wave compares generation with control signal, the duty ratio having the same in stable state, relatively after polarity be
Just, high level is generated, corresponding IGBT module is driven to be connected, polarity is negative after comparing, and generates low level, drives corresponding IGBT
Module shutdown；In dynamic, the generation of the driving signal of every IGBT module is by discontinuous sawtooth carrier wave and control signal
Compare generation, duty ratio real-time change；
(3) the phase-shifting carrier wave actuation techniques of the equal duty ratio carrier wave different, traditional from traditional phase-shifting carrier wave actuation techniques
Duty ratio in phase shift actuation techniques is unable to equal part, changeable, and when duty ratio is more than or equal to 1/4, every road BUCK circuit is not
It is able to achieve double frequency function, the final output current ripples of two-way BUCK circuit only 2 frequency multiplication, only when duty ratio is less than 1/4,
Every road BUCK circuit is just able to achieve double frequency function, 8 frequency multiplication of final output current ripples.When output voltage is higher, particularly with
Plasma (orifice) gas cutting mill application, duty ratio are greater than 0.5 but less than 0.6, thus the present invention can be realized under any operating condition it is defeated
8 frequencys multiplication of electric current out could improve DC inductance current ripples frequency in the constant situation of carrier frequency, and then improve electric current essence
Fineness improves work piece cut quality, and can be improved output power grade；Or maintain DC inductance current ripples frequency
It is constant, and then carrier frequency is reduced, the switching loss of IGBT module is reduced, so as to improve power grade.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (2)
1. a kind of modulating system of plasma cutting machine output current ripple frequency doubling system, the plasma cutting machine exports electric current
Ripple frequency doubling system, including reduction voltage circuit, chopper circuit and cutting torch circuit, in which: the reduction voltage circuit is to complete three intersections
The transformation of galvanic electricity pressure；The chopper circuit is to synthesize stable DC stream all the way；The cutting torch circuit is fine to complete
Cutting；
The reduction voltage circuit includes an Industrial Frequency Transformer, in which: the input terminal of the Industrial Frequency Transformer three-phase primary windings point
It is not connected with three-phase alternating-current supply, secondary includes two groups 30 ° of difference of three-phase secondary windings, the first phase point of three-phase secondary windings
Not Wei Y connect 0 ° and Δ connects 30 °；
The chopper circuit includes two groups of BUCK circuits, is the first BUCK circuit and the 2nd BUCK circuit, the first BUCK electricity respectively
Workpiece to be processed after road, the 2nd BUCK circuit output end are in parallel with cutting torch circuit is connected；
It is characterized by:
The first BUCK circuit include: first diode do not control three-phase rectification bridge, the first electrolytic capacitor, the first power resistor,
First IGBT module, the second IGBT module, third IGBT module, the 4th IGBT module, first it is reversed fast restore power diode,
Second it is reversed fast restore power diode, third reversely restore fastly power diode, the 4th it is reversed it is fast restore power diode and
First flat wave inductance, in which: the input that first diode does not control three-phase rectification bridge is that Y connects 0 ° of three-phase secondary windings in reduction voltage circuit
Output Ua1, Ub1 and Uc1, the direct current output anode and the first electrolytic capacitor that first diode does not control three-phase rectification bridge are just
Pole, one end of the first power resistor, the first reversed fast recovery power diode cathode, second reversely restore power diode yin fastly
Pole, third reversely restore fastly power diode cathode, the 4th it is reversed fast restore power diode cathode, the first flat wave inductance one
End is connected, and first diode does not control the direct current output cathode of three-phase rectification bridge and the cathode of the first electrolytic capacitor, the first power electricity
The other end of resistance, the emitter of the first IGBT module, the emitter of the second IGBT module, the emitter of third IGBT module,
The emitter of four IGBT modules is connected, the collector of the first IGBT module, the collector of the second IGBT module, third IGBT module
Collector, the 4th IGBT module collector and first reversed fast restore power diode anode, second reversed fast restore function
Rate diode anode, third reversely restore power diode anode fastly, the 4th reversed fast power diode anode that restores is connected, shape
At the cathode of DC power supply, the other end of the first flat wave inductance forms the anode of DC power supply；
The 2nd BUCK circuit include: the second diode do not control three-phase rectification bridge, the second electrolytic capacitor, the second power resistor,
5th IGBT module, the 6th IGBT module, the 7th IGBT module, the 8th IGBT module, the 5th it is reversed fast restore power diode,
6th it is reversed fast restore power diode, the 7th it is reversed it is fast restore power diode, the 8th it is reversed it is fast restore power diode and
Second smoothing reactor, in which: the three-phase input that the second diode does not control three-phase rectification bridge is that Δ connects 30 ° of three-phases in reduction voltage circuit
Output Ua2, Ub2 and Uc2 of secondary windings, the second diode do not control the direct current output anode and the second electrolysis electricity of three-phase rectification bridge
The anode of appearance, one end of the second power resistor, the 5th reversed fast recovery power diode cathode, the 6th reversely restore power two fastly
Pole pipe cathode, the 7th reversed fast recovery power diode cathode, the 8th are reversely fast to restore power diode cathode, the second flat wave electricity
One end of sense is connected, and the second diode does not control the direct current output cathode of three-phase rectification bridge and the cathode of the second electrolytic capacitor, second
The other end of power resistor, the 5th IGBT module emitter, the 6th IGBT module emitter, the 7th IGBT module emitter,
Eight IGBT module emitters, the 5th IGBT module collector, the 6th IGBT module collector, the 7th IGBT module collector,
Eight IGBT module collectors and the 5th it is reversed fast restore power diode anode, the 6th it is reversed it is fast restore power diode anode,
7th reversed fast recovery power diode anode, the 8th reversed fast power diode anode that restores are connected, and form DC power supply
Cathode, the other end of the second flat wave inductance form the anode of DC power supply；
The modulating system of above-mentioned plasma cutting machine output current ripple frequency doubling system includes that filter unit, expectation electric current are more single
Member, Fractional Order PID adjust unit, clipping unit, carrier wave comparing unit and polarity judging unit, in which: carrier wave comparing unit packet
Include the first~the 8th carrier wave comparing unit；Polarity judging unit includes the first~the octupole property judging unit；
Cutting machine output current signal in resulting operation, i.e. the total current signal io of two-way BUCK circuit output are sampled, is sent into
Filter unit, the output electric current after filtering unit filters input expectation electric current comparing unit, and expectation electric current comparing unit should
Output electric current subtracts each other to obtain current error with the corresponding expectation electric current for wishing actual output current, which inputs fractional order
PID adjusts unit, and Fractional Order PID adjusts unit and carries out proportional integral differential adjusting to current error, and Fractional Order PID adjusts unit
Output be connected with clipping unit, clipping unit ensures that Fractional Order PID adjusts export-restriction between specified bound, prevents out
Existing overflow and underflow, the input that the output of clipping unit carries the~the eight carrier wave comparing unit as first, another input
Respectively first~the 8th carrier wave, is compared respectively, i.e., Fractional Order PID adjusts output compared with carrier wave carries out size, compares
8 tunnel results afterwards input the first~the octupole property judging unit respectively, and the first~the octupole property judging unit carries out polarity judgement:
8 tunnel results after comparing are that timing exports high level, and 8 tunnel results after comparing export low level, the first~the octupole when being negative
Property judging unit output generate the first~the 8th PWM drive signal, eight PWM drive signals respectively drive in BUCK circuit the
The on-off of one~the 8th IGBT module completes the transformation of input voltage to output electric current；
In stable state, the driving signal of every IGBT module is the generation that compared by discontinuous sawtooth carrier wave with control signal
, the duty ratio having the same in stable state, polarity is positive after comparing, and generates high level, and drive corresponding IGBT module to be connected,
Compare rear polarity to be negative, generate low level, corresponding IGBT module is driven to turn off；In dynamic, the driving of every IGBT module
The generation of signal is also the generation that compared by discontinuous sawtooth carrier wave with control signal, duty ratio real-time change；
The on-off of eight IGBT modules of two-way BUCK circuit is controlled by the PWM drive signal of equal duty ratio, wherein per all the way
IGBT module trigger sequence successively differs 90 °, so that two-way is exported according to practical work per 4 frequency multiplication of DC current ripple all the way
Condition differs 45 ° of certain angle, complements each other so that 8 frequency multiplication of DC current output current ripple frequency synthesized, in any operating condition
Under can be realized 8 frequencys multiplication of output current ripple.
2. the modulating system of plasma cutting machine output current ripple frequency doubling system according to claim 1, feature exist
In the cutting torch circuit is connected with two output ends of two-way BUCK circuit, in which: workpiece one end to be processed and chopper circuit
Anode be connected, the workpiece other end to be processed is connected with plasma column one end, and the plasma column other end and cutting torch touch mouth
And internal electrode is connected, the cathode of cutting torch circuit is connected with the cathode of chopper circuit.
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| CN107959418A (en) * | 2017-11-08 | 2018-04-24 | 北京科诺伟业科技股份有限公司 | A kind of switching regulator interlocks DC-DC converter |
| CN110444371A (en) * | 2019-07-17 | 2019-11-12 | 孙崇山 | Wire current contrary distribution core type smoothing reactor |
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