CN103623881B - An a kind of FFT ferrite allotment regulating device - Google Patents

Abstract

The invention discloses a kind of FFT ferrite allotment regulating device, comprise pressure vessel assemblies, be arranged on the circuitry components of described pressure vessel assemblies one end, near described pressure vessel assemblies away from circuitry components one end, be arranged on the magnetic loop system of described pressure vessel assemblies inside, and be arranged on the conductor assembly at described magnetic loop system assembly two ends; Described conductor assembly is connected with Circuits System.A FFT ferrite allotment regulating device of the present invention, can overcome the defects such as complex structure in prior art, inconvenient operation and result of use difference, to realize the advantage that structure is simple, easy to operate and result of use is good.

Description

An a kind of FFT ferrite allotment regulating device

Technical field

The present invention relates to ICRF Heating Experiment equipment technical field, particularly, relate to a kind of FFT ferrite allotment regulating device.

Background technology

EAST Novel ion convolution heating (ICRF) is one of Main Means of auxiliary heating in Tokamak.ICRF system comprises three major parts: RF emitter, transmission circuit network and antenna.In reality, the input impedance of antenna and the output impedance of emitter are not mated, and particularly when the impedance of antenna changes due to plasma variations thereupon, matching problem will become more complicated.In tokamak Heating Experiment, in order to obtain effective power delivery, the task of matching network is exactly that the modulation input impedance of antenna makes it reach consistent with the output impedance of emitter, thus obtains maximum antenna radiated power heating plasma.Traditionally, the coupling in radio-frequency region, the matching system that can be made up of variable short branch, phase shifter and variable or fixing vacuum condenser has come.

Traditional impedance matching system, it before blowing out at every turn, the duty of the range computation tuner that the plasma parameter according to next big gun and the antenna load impedance with pre-test may change, thus realize coupling.But owing to allocating the restriction of speed, this matching system cannot realize blowing out the real-time matching of period, particularly at L-Hmode, and when ELMS, obvious by all the more of the situation of mismatch.Traditional impedance matching system can not meet the needs of ICRF Heating Experiment.

Realizing in process of the present invention, inventor finds at least there is the defects such as complex structure, inconvenient operation and result of use difference in prior art.

Summary of the invention

The object of the invention is to, for the problems referred to above, propose a kind of FFT ferrite allotment regulating device, to realize the advantage that structure is simple, easy to operate and result of use is good.

For achieving the above object, the technical solution used in the present invention is: an a kind of FFT ferrite allotment regulating device, comprise pressure vessel assemblies, be arranged on the circuitry components of described pressure vessel assemblies one end, near described pressure vessel assemblies away from circuitry components one end, be arranged on the magnetic loop system of described pressure vessel assemblies inside, and be arranged on the conductor assembly at described magnetic loop system assembly two ends; Described conductor assembly is connected with Circuits System.

Further, be positioned at the below of described conductor assembly, in described magnetic loop system one end near circuitry components, be provided with cooling system assembly.

Further, described magnetic loop system assembly, comprises the first magnetic loop assembly and the second magnetic loop assembly that are equipped with successively.

Further, the structure of described first magnetic loop assembly is identical with the structure of the second magnetic loop assembly.

Further, described conductor assembly, comprises and is arranged on the outer conductor assembly of described magnetic loop system near circuitry components one end, and be arranged on the inner conductor component of described magnetic loop system away from circuitry components one end.

Further, described outer conductor assembly outer conductor assembly identical with the structure of inner conductor component is different with the structure of inner conductor component.

Further, described pressure vessel assemblies, comprises cylindrical pressure vessel.

A FFT ferrite allotment regulating device of various embodiments of the present invention, owing to comprising pressure vessel assemblies, be arranged on the circuitry components of pressure vessel assemblies one end, near pressure vessel assemblies away from circuitry components one end, be arranged on the magnetic loop system of pressure vessel assemblies inside, and be arranged on the conductor assembly at magnetic loop system assembly two ends; Described conductor assembly is connected with Circuits System; Ferrite Rapid matching can be realized; Thus the defect of complex structure in prior art, inconvenient operation and result of use difference can be overcome, to realize the advantage that structure is simple, easy to operate and result of use is good.

Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from description, or understand by implementing the present invention.

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

Accompanying drawing explanation

Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for description, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the structural representation of the two detail adaptation of coaxial line that a FFT ferrite of the present invention allotment regulating device is suitable for;

Fig. 2 is ferrite stub sectional view in Fig. 1;

Fig. 3 is the model stereogram of Fig. 1;

Fig. 4 is the sectional view of Fig. 3;

Fig. 5 is the equivalent radio frequency circuit of terminal short circuit strip line in Fig. 1;

Fig. 6 is that the differential phase shift of a FFT ferrite of the present invention allotment regulating device is with change of frequency analogous diagram;

The phase lengths curve map of Fig. 7 FFT ferrite allotment of the present invention regulating device;

In Fig. 8 FFT ferrite allotment of the present invention regulating device, maximum field intensity E is with the variation diagram of outer conductor inside radius b;

Fig. 9 is the strip line electric field stereogram of a FFT ferrite of the present invention allotment regulating device;

Figure 10 is the Distribution of Magnetic Field of infiltrating in a FFT ferrite of the present invention allotment regulating device in Ferrite Material;

Figure 11 is the self-induction curve map of field coil under a FFT ferrite of the present invention allotment regulating device different operating frequency;

Figure 12 is the analogous diagram of a FFT ferrite of the present invention allotment regulating device insertion loss with change of frequency;

Figure 13 is the flow chart of magnetic Circuit Design in a FFT ferrite of the present invention allotment regulating device;

Figure 14 is the circuit diagram of magnetic Circuit Design in a FFT ferrite of the present invention allotment regulating device; A () is mock-up figure; B () is equivalent circuit diagram; (c) equivalent circuit reduced graph;

Figure 15 is the perspective view of a FFT ferrite of the present invention allotment regulating device;

Figure 16 is the planar structure schematic diagram of a FFT ferrite of the present invention allotment regulating device; A () is for looking up structural representation; B () is the partial sectional view of main TV structure; C () is left TV structure schematic diagram;

Figure 17 is the structural representation of pressure vessel in a FFT ferrite of the present invention allotment regulating device;

Figure 18 is the structural representation of cooling system assembly in a FFT ferrite of the present invention allotment regulating device;

Figure 19 is the structural representation of magnetic loop assembly in a FFT ferrite of the present invention allotment regulating device;

Figure 20 is the structural representation of inner conductor component in a FFT ferrite of the present invention allotment regulating device;

Figure 21 is the structural representation of a FFT ferrite of the present invention allotment regulating device China and foreign countries conductor assembly.

By reference to the accompanying drawings 2, in the embodiment of the present invention, Reference numeral is as follows:

1-outer conductor assembly; 2-inner conductor component; 3-ferrite; 4-NdFeB material layer; 5-silicon steel sheet; 6-coil.

By reference to the accompanying drawings 15,16, in the embodiment of the present invention, Reference numeral is as follows:

1-pressure vessel assemblies; 2-first magnetic loop assembly; 3-second magnetic loop assembly; 4-cooling system assembly; 5-circuitry components; 6-inner conductor component; 7-outer conductor assembly.

By reference to the accompanying drawings 17, in the embodiment of the present invention, Reference numeral is as follows:

1-9 inch interface; 2-housing; 3-inflatable interface; 4-water intaking valve; 5-outlet valve; 6-leg.

By reference to the accompanying drawings 18, in the embodiment of the present invention, Reference numeral is as follows:

Cold drawing on 1-outer conductor; 2-inner wire cold drawing; Cold drawing under 3-outer conductor; 4-water tank; 5-copper tube; 6-water intaking valve; 7-outlet valve.

By reference to the accompanying drawings 19, in the embodiment of the present invention, Reference numeral is as follows:

1-planker; 2-NdFeB material layer; 3-coil; 4-silicon steel sheet.

By reference to the accompanying drawings 20, in the embodiment of the present invention, Reference numeral is as follows:

1-adapter sleeve (quantity 1); 2-spoke (quantity 5); 3-fixed head (quantity 1); 4-copper tube (quantity 5).

By reference to the accompanying drawings 21, in the embodiment of the present invention, Reference numeral is as follows:

1-fasten panels (quantity 1); 2-cover plate (quantity 2); 3-copper tube (quantity 10); 4-side plate (quantity 2).

Detailed description of the invention

Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.

In radio frequency and microwave propagation, usually reflection power can be increased due to the change of load under different operating state, reduce the efficiency of transmission of circuit.Therefore, must regulate transmission line, to ensure the efficiency of transmission of transmission line, make device be in optimum Working.

In transmission line theory, require that the power that load and transmission line match to ensure to be transferred to from emission source load is many as much as possible, and the loss of transmission line itself is few as much as possible.The impedance matching of transmission line mainly comprises two aspects: one is the impedance matching of transmission line and load, to eliminate the power reflection of load, makes transmission line work in traveling-wave mode; Two is impedance matchings of transmission line and wave source, and object obtains peak power output from microwave source.Under normal circumstances, the impedance matching portion of emitter is own through being made in emitter inside, ensures that its output impedance equals the characteristic impedance of transmission line.

Impedance matching has three kinds usually, i.e. load impedance coupling, wave source impedance matching and conjugate impedance match.Under load impedance matching condition, load will absorb whole incident power, ensure the most effective of transmission line; Under conjugate impedance match condition, on the arbitrary cross section of transmission line, input impedance Zi and singal source resistance Z0 conjugate each other, now signal source power output is maximum.In engineer applied, three kinds of couplings generally can not realize simultaneously, and most important impedance matching is load impedance coupling, can work in traveling-wave mode to make transmission line.In order to load can be made enough to absorb peak power, thus when transmission line does not mate with load, then need termination adaptation, impedance matching must be carried out to it.

In transmission line, its characteristic impedance wherein: L1 is the inductance of unit length transmission line; C1 is the electric capacity of unit length transmission line.Therefore, in lossless or microwave transmission situation, only depend on distributed constant L1 and C1 of transmission line, have nothing to do with operating frequency, also have nothing to do with the position of transmission line.Therefore, we can mating by suitable method load impedance and line characteristic impedance Z0.

In order to overcome the limitation of original matching system, need plan design and establishing ferrite Rapid matching system; According to the embodiment of the present invention, as shown in Fig. 1-Figure 21, provide a kind of FFT ferrite allotment regulating device (1.5MW).

See Figure 15 and Figure 16, a FFT ferrite allotment regulating device of the present embodiment, comprise pressure vessel assemblies (pressure vessel assemblies 1 as in Figure 15 and Figure 16), be arranged on the circuitry components (circuitry components 5 as in Figure 15 and Figure 16) of pressure vessel assemblies one end, near pressure vessel assemblies one end away from circuitry components, be arranged on the magnetic loop system (the first magnetic loop assembly 2 and the second magnetic loop assembly 3 as in Figure 15 and Figure 16) of pressure vessel assemblies inside, and be arranged on the conductor assembly (as the inner conductor component 6 in Figure 15 and Figure 16 and outer conductor assembly 7) at magnetic loop system two ends, conductor assembly is connected with circuitry components.Be positioned at the below of conductor assembly, in magnetic loop system one end near circuitry components, be provided with cooling system assembly (the cooling system assembly 4 as in Figure 15 and Figure 16).Pressure vessel assemblies, comprises cylindrical pressure vessel.

Here, pressure vessel assemblies operation principle: see Figure 17,9 inch interface of pressure vessel assemblies (9 inch interface 1 as in Figure 17) are installed to system, are filled with 0.6MPa sulfur hexafluoride gas for arc extinguishing by inflatable interface (inflatable interface 3 as in Figure 17); Enter 0.5MPa press water for cooling inner wire and outer conductor by water intaking valve (water intaking valve 4 as in Figure 17), and by outlet valve (outlet valve 5 as in Figure 17), heat is discharged.In fig. 17, pressure vessel assemblies also comprises housing (housing 2 as in Figure 17) and leg (leg 6 as in Figure 17), housing is arranged on leg, and 9 inch interface are located at one end of housing, and inflatable interface, water intaking valve and outlet valve are all located at the other end of housing.

Cooling system component operation principle: see Figure 18, the large unit of each hear rate is all based on cold drawing, cold drawing is divided into inner wire cold drawing (the inner wire cold drawing 2 as in Figure 18) and the upper and lower cold drawing of outer conductor (as cold drawing 3 under cold drawing 1 on the outer conductor in Figure 18 and outer conductor), cooling water enters stratified water tanks (water tank 4 as in Figure 18) by after water intaking valve (water intaking valve 6 as in Figure 18), then enter internal and external conductor cold drawing carry out heat exchange through copper tube (copper tube 5 as in Figure 18) road, complete heat finally by outlet valve to export, as shown in figure 18.

Wherein, above-mentioned magnetic loop system assembly, comprises the first magnetic loop assembly (as the first magnetic loop assembly 2) and the second magnetic loop assembly (as the second magnetic loop assembly 3) that are equipped with successively.The structure of the first magnetic loop assembly is identical with the structure of the second magnetic loop assembly.

Here, magnetic loop component operation principle (the first magnetic loop assembly and the second magnetic loop assembly are together): the magnetic field that magnet (neodymium iron boron) produces forms magnetic loop by silicon steel sheet, coil produces bias magnetic field under the function of current, and magnetic field changes magnetic conductivity, thus changes electrical length.See Figure 19, magnetic loop assembly comprises silicon steel sheet (silicon steel sheet 4 as in Figure 19), be arranged on silicon steel sheet inside and be stratified and set on coil (coil 3 as in Figure 19) and the NdFeB material layer (NdFeB material 2 as in Figure 19) of top, and being arranged on silicon steel sheet inside and planker (planker 1 as in Figure 19) below being stratified and set on.

Above-mentioned conductor assembly, comprises and is arranged on the outer conductor assembly (as outer conductor assembly 7) of magnetic loop system near circuitry components one end, and is arranged on the inner conductor component (as inner conductor component 6) of magnetic loop system away from circuitry components one end.

Here, inner conductor component and outer conductor component operation principle: form strip line between inner wire and outer conductor, signal wave passes through strip transmission.See Figure 20 and Figure 21, during assembling, should assemble on platform, require that each parts are smooth vertical and horizontal, crooked phenomenon must not be had; Overall silver-plated, silver plating thicknesses is 20 microns.

See Figure 20, inner conductor component comprises the many spokes (spoke 2 as in Figure 20) that horizontal parallel is arranged, be separately positioned on adapter sleeve (adapter sleeve 1 as in Figure 20) and the fixed head (fixed head 3 as in Figure 20) at spoke two ends, be located at the many piece copper tubes (copper tube 4 as in Figure 20) of fixed head away from spoke one end.

See Figure 21, outer conductor assembly comprises multiple cover plates (cover plate 2 as in Figure 21) that horizontal parallel is arranged, be located at fasten panels (fasten panels 1 as in Figure 21) and the pair of side plates (side plate 4 as in Figure 21) at cover plate two ends respectively, and between pair of side plates and the parallel many copper tubes (copper tube 3 as in Figure 21) being arranged on patch ends.

In FFT ferrite allotment the regulating device of above-described embodiment, two detail adaptations (FFT ferrite allotment detail the belongs to pair detail adaptation one) primary structure that is suitable for see Fig. 1.Wherein, each joint transmission line is 50 Ω transmission lines, wherein gets d ₂=3/8 λ, characteristic impedance Z 0 (being commonly defined as 50 Ω), load impedance ZL is any resistance.Can be known by the mapping of smith circle diagram, the length l1 of suitable adjustment first ferrite coupling detail (i.e. the first ferrite coupling detail 8) and the length l2 of the second ferrite coupling detail (i.e. the second ferrite coupling detail 9), mating of optional frequency and any resistance and 50 Ω characteristic impedances can be realized, realize the maximum power output of power source.

Ferrite magnetic conductance μ is by the intensity of magnetization (M) of Ferrite Material and the impact of applied field strengths (H).Therefore, join in transmission line by selecting suitable Ferrite Material, and suitable design is carried out to its physical dimension, distributing position and applied field strengths (H) in transmission line, then by the adjustment of external magnetic field intensity (H) can make adaptation obtain needed for effective electrical length (β l).

See Fig. 2, ferrite stub comprises horizontally disposed inner conductor component (inner conductor component 2 as in Fig. 2), be arranged on the outer conductor assembly (the outer conductor assembly 1 as in Fig. 2) of inner conductor component periphery, horizontal parallel is arranged on the ferrite (ferrite 3 as in Fig. 2) between inner conductor component and outer conductor assembly, horizontal parallel is arranged on outer conductor assembly, the NdFeB material layer (the NdFeB material layer 4 as in Fig. 2) of downside, vertically be symmetricly set on the silicon steel sheet (silicon steel sheet 5 as in Fig. 2) of outer conductor assembly and NdFeB material layer end, be symmetricly set on silicon steel sheet, the coil (coil 6 as in Fig. 2) of lower end.

A FFT ferrite allotment regulating device of above-described embodiment, technical requirement is as follows: 1. operating frequency: 25 ~ 70MHz; 2. differential electrical length: 60cm; 3. insertion loss :≤1%; 4. the response time :≤10ms; 5. system impedance: 50 Ω; 6. peak power can be born: 1.5MW.

A FFT ferrite allotment regulating device of above-described embodiment, embodiment and result comprise:

(i) radio frequency scheme

Ferrite stub mainly comprises yoke, permanent magnet, bias magnetic field coil and is partially filled the strip line (see Fig. 2) of Ferrite Material.By changing the size of bias magnetic field, making the magnetic conductivity of Ferrite Material that corresponding change occur, finally realizing the change of the equivalent electric length of this FFT ferrite allotment regulating device device.

This radio frequency scheme, adopts low-impedance strip transmission, and the internal and external conductor of strip line opens 4 gaps, reach the effect reducing eddy current, the width of every bar seam is 5mm, the thick 10mm of inner wire, long 1370mm, the long 1430mm of outer conductor, inner wire adopts hollow structure to facilitate water-cooled cooling.Ferrite is divided into two sections of effective coverages, and midfeather 200mm(is see Fig. 3 and Fig. 4).

Segmented mode is exactly direct segmentation, does not add short board.Gap length is made up of rectangular coaxial line (similar strip line, but there is metal boundary both sides), and this length is determined by required gap length between line bag corresponding to the phase shift line segment of two sections of effective lengths.Its first half section of transforming section is square circle transformation, after convert with the square square of exponential function.Due to size restriction, λ can not be used _gthe transform length of/4, so can only realize by transition line mode.

(1) differential electrical length

1. the influence factor of differential phase shift: the influence factor of differential phase shift mainly comprises magnetic conductivity, detail length, frequency.

The impact of a, magnetic conductivity:

This FFT ferrite allotment regulating device, be operated in high field region, at the bias magnetic field of ferrite sample interior, the boundary condition of ferrite surfaces is different from impressed field usually.When external magnetic field and Ferrite Material plane orthogonal, due to the continuity of magnetic induction density B on material surface, the magnetic conductivity μ of Ferrite Material can be expressed as bias magnetic field H and saturation magnetization M _sfunction: therefore Ferrite Material can describe with scalar magnetic conductivity under certain condition, thus simplifies theory analysis process.To lossless transmission line, characteristic impedance Z ₀can be expressed as with propagation constant β:

$Z_0=\sqrt{\frac{L_0}{C_0}}---\left(1\right);$

$\mathrm{\β}=\mathrm{\ω}\sqrt{L_0{C}_0}---\left(2\right);$

Wherein: ω is operating frequency, L ₀and C ₀be respectively distributed inductance and the distribution capacity of transmission line.

In this FFT ferrite allotment regulating device, the distributed inductance of strip line is relevant to the magnetic conductivity of Ferrite Material, can be realized the change of equivalent electric length by the magnetic conductivity changing Ferrite Material.Adopt finite element method, the distribution capacity of strip line under different bias magnetic field and distributed inductance all can calculate.

Because strip lines configuration has multiple independent parameter, when analyzing these independent parameters to the affecting of duty, need suppose that other parameters are constant.For ensureing to obtain compact physical size and rational weight in 25 ~ 70MHZ operating frequency range, ferrite stub have employed low-impedance strip lines configuration.

At the selection of Ferrite Material above and the part of detecting of technical parameter, also fully checking describes the impact of magnetic conductivity on differential phase shift.

The impact of b, detail length

Ferrite stub is the short circuit strip lines configuration of a variableimpedance, and its connectivity port place must be mismatch (see Fig. 5).The characterisitic parameter (characteristic impedance, propagation constant, length) of port Impedance and strip line all can affect the equivalent electric length of whole detail.In order to describe the change of equivalent electric length, calculate this detail S ₁₁the differential phase shift Δ φ of parameter.

Utilize transmission line theory, the reflectance factor of input port can be expressed as:

$S_{11}={\mathrm{\Γ}}_{\mathrm{port}}=\frac{Z_{\mathrm{in}}\left(L\right)-Z_{\mathrm{port}}}{Z_{\mathrm{in}}\left(L\right)+Z_{\mathrm{port}}}---\left(3\right);$

Wherein, Γ _portfor port reflects coefficient; Z _in(L) be the input impedance of short-circuit line incidence end; L is the length of detail; Z _portfor the port Impedance of junction.

Also can be expressed as:

$Z_{\mathrm{in}}\left(L\right)=Z_0\frac{1-e^{-j2\mathrm{\βd}}}{1+e^{-j2\mathrm{\βd}}}---\left(4\right);$

Wherein, d is the length of distance short-circuit end.

Can obtain according to formula (1) ~ (4):

$S_{11}=\frac{(-1+e^{j2\mathrm{\ωL}\sqrt{L_0{C}_0}})\sqrt{\frac{L_0}{C_0}}-(1+e^{j2\mathrm{\ωL}\sqrt{L_0{C}_0}})Z_{\mathrm{port}}}{(-1+e^{j2\mathrm{\ωL}\sqrt{L_0{C}_0}})\sqrt{\frac{L_0}{C_0}}+(1+e^{j2\mathrm{\ωL}\sqrt{L_0{C}_0}})Z_{\mathrm{port}}}---\left(5\right);$

Obtaining differential phase shift is:

Wherein, B _maxand B _minbe respectively the minimum and maximum value of bias magnetic field magnetic induction intensity.

The impact of c, frequency

To the structure of limited length, differential phase shift and frequency closely related, higher frequency can obtain larger differential phase shift.Meanwhile, differential phase shift shows certain periodicity in detail length.Choose rational detail length, to ensure the differential phase shift requirement realizing full frequency band in bandwidth of operation.

(2) differential phase shift Computer Simulation

Under power 1.5MW condition, computer simulation chart (Fig. 6) under ADS2008 simulation software.Under certain frequency scope, the analogous diagram that the differential phase shift of two kinds of extreme cases (red line is not biasing field, and blue line is H=80000) changes.

(3) difference equivalent electric length computation

1. differential phase moves angle

Choose two kinds of extreme positions and obtain phase shift angle maximum difference, be i.e. the maximum difference difference of detail phase shift that causes of the change of different magnetic field; As 25MHZ from-20 to 35 changes about 55 °.

2. difference equivalent electric length, illustrated by 25MHZ and calculate:

25MHz and 55 ° is brought into:

$2\mathrm{\Δd}=360\frac{55\×3\×{10}^8}{720\×25\×{10}^6}=184\mathrm{cm};$

If only calculate electrical length difference herein to should be 184cm.But this 184cm is by the differential electrical length inciding outgoing, and its transmitting procedure is equivalent to two detail length.Electrical length due to the difference equivalence of this detail environment for use requirement is the electrical length change of single detail, so should divided by two according to the result of above-mentioned calculating, namely single detail difference equivalent electric length be 92cm.Can show that the equivalent electric length that 25MHZ is corresponding is 92cm thus.

In like manner show that the differential phase angle that other frequencies are corresponding and differential phase length see the following form, curve map (Fig. 7).

frequency (MHZ)	phase shift (.)	phase lengths (cm)
			25	55	92
30	65	90
			35	78	93
40	55	57
			45	72	67
50	67	56
			55	55	42
60	114	79
			65	126	81
70	130	77

(4) bear peak power

1. the calculating of maximum power capabilities: the electric field breakdown strengths Ec=3*106V/m of air, coaxial inner conductor outer radius a=10mm, outer conductor inside radius b, peak power P=1.5MW, maximum field intensity E theoretical formula:

$E\left(b\right):=\sqrt{\frac{p\·\mathrm{\η}0}{\mathrm{\π}\·a^2\·\ln \left(\frac{b}{a}\right)}}.$

Can be drawn by Fig. 8, when inner and outer conductor spacing is 20mm, electric field E=2.1MV/m, is less than the electric field breakdown strengths Ec of air, in fact, also little in lower frequency, shorter transmission line maximum field intensity; If add dielectric material in transmission line, the ability of bearing peak power also can be improved.

2. strip line electric field stereogram

When electric field E value reaches 1.4793e+006, magnetic field can be had influence on, thus easily cause sparking, it is exactly the color part of topmost portion in color illustrates in Fig. 9, can find out that by there being Fig. 9 internal magnetic field is the color of lowermost part in color illustrates, explanation fails to have influence on magnetic field, does not reach breakdown strength, thus can prove to bear peak power in 1.5MW.

(5) the response time: the response time of ferrite stub mainly affects by two aspects: the eddy current effect of conductor, the self-induction of bias magnetic field coil.

1. the impact of eddy current: the vortes interference in conductor is mainly from two aspects: is yoke, and two is strip line internal and external conductors.

A FFT ferrite allotment regulating device of above-described embodiment, selects ansoftMaxwell3Dcodes to carry out the impact of simulation analysis of computer eddy current effect.The internal and external conductor of strip line has opened many gaps, to reduce the impact of eddy current.Inner wire adopts hollow structure to facilitate water-cooled cooling, and in internal and external conductor, the number in gap and position are determined jointly by computer artificial result and mechanical processing difficulty.The bias magnetic field that Ferrite Material inside is infiltrated in rising along with bias magnetic field change frequency will reduce (Figure 10).During 50Hz, magnetic field is evenly distributed in whole Ferrite Material, and mean value is 0.04T; During 500Hz, magnetic field starts distortion but relatively even, and mean value is about 0.03T; During 1KHZ, the distortion of whole magnetic field is serious, and mean value is about 0.01T only.

Overcome the method for vortes interference:

The structure that the iron core that curvature adopts silicon steel sheet stack to be pressed into, strip line internal and external conductor crack.

2. the self-induction impact of field coil

In design bias magnetic field coil process, meeting the prerequisite of design object, the lower inductance that as far as possible should reduce field coil.Adopt the relation (Figure 11) of ansoftMaxwell3Dcodes simulation analysis of computer coil inductance and operating frequency, along with the increase of operating frequency, inductance value declines, and in 0 ~ 1KHZ frequency range, inductance is about 2 ~ 7mH.For improving the response time of field coil, the power supply that this device is selected have employed four-quadrant gauge tap.The most significant advantage of this four-quadrant switches power supply be ER effect to time, feed back in coil again after the current energy in field coil can being stored, thus significantly improve the stabilization time of field coil electric current and the response time of ferrite stub.

Four-quadrant controls power supply: input three-phase: 380V ± 10%; PFC PFC: PF>0.95; Output voltage: ± 500V; Output current: 0 ~ ± 150A; Output current ripple :≤1%; Control mode: current stabilization; Control accuracy :≤0.5%; Control mode :-9v ~+9v is voltage-controlled.

3. response time explanation

Slot to the internal and external conductor of ferrite stub, magnetic conduction selects the import silicon steel sheet of ultra-thin 0.1mm simultaneously, substantially reduces the response time.Can realize within the response time reaches 10ms the most at last.

(6) insertion loss

Ferrite Material has a certain impact to insertion loss, and when gyromagnetic ferrite is applied under microwave condition, its loss mainly comprises low-intensity magnetic field loss, dielectric loss and ferromagnetic resonance loss.Weak magnetic loss and frequency and 4 π M _srelevant, reduce saturation magnetization 4 π M _s, weak magnetic loss can be reduced.Resonance loss is relevant with Δ H, and Δ H is narrower, and resonance point absorbs larger, less from the loss away from resonance point.Therefore above can drawing is summarized: suitably changing parameter can greatly reduce the wastage.Relevant parameter changes sees P10 ~ P15 to the test of loss impact.

Under 1.5MW power, computer simulation chart (Figure 12) under ADS2008 simulation software, within the scope of certain frequency, the emulation that the difference loss of two kinds of extreme cases (red line is not biasing field, and blue line is H=80000) changes.

Material and its coupling affect its Insertion Loss, and simulation result and actual experiment test can have a tremendous difference, and only result can not be described with Computer Simulation, and the later stage requires to do some specific experiments according to technical standard, reaches technical indicator further.

(ii) magnetic Circuit Design

The DC bias magnetic field of magnetic Circuit Design is 1500 ± 500Gauss, adopts Analysis of Magnetic Circuit method, and Computer Simulation optimization adopts Ansoftmaxwell software.The flow chart of magnetic Circuit Design, see Figure 13.The calculating of external magnetic circuit: adopt two E-type magnetic road, the circuit diagram of external magnetic circuit is see Figure 14.

After segmentation, each road magnetic resistance: $R_1=\frac{1_1}{{\mathrm{\μA}}_1},R_2=\frac{1_2}{{\mathrm{\μA}}_2},R_3=\frac{1_3}{{\mathrm{\μA}}_3};$

Magnetic potential (F=NI, ferromagnetic material is tabled look-up): F=Φ (R ₁+ R ₂+ 2R ₃);

Air-gap reluctance: $R_{\mathrm{\δ}}=\frac{\mathrm{\δ}}{{\mathrm{\μ}}_{0}C\×D};$

Center pillar magnetic resistance with air gap: $R_1^{\′}=\frac{\mathrm{\δ}}{{\mathrm{\μ}}_0{A}_1}+\frac{1_1-\mathrm{\δ}}{{\mathrm{\μA}}_1}.$

A FFT ferrite allotment regulating device of above-described embodiment, technology is described as follows:

(1) should assemble on platform, require that each parts are smooth vertical and horizontal, crooked phenomenon must not be had;

(2), after pass the test, gas test need be re-started;

(3) do the water pressure test to cooling system entirety after assembling, test pressure is 0.8MPa, and entirety must not have leakage phenomenon;

(4) outer surface plastic-blasting (noting protection instrument and meter).

Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (4)

1. a FFT ferrite allotment regulating device, it is characterized in that, comprise pressure vessel assemblies, be arranged on the circuitry components of described pressure vessel assemblies one end, away from circuitry components, the magnetic loop system being arranged on described pressure vessel assemblies inside, and be arranged on the conductor assembly at described magnetic loop system assembly two ends; Described conductor assembly is connected with Circuits System;

Be positioned at the below of described conductor assembly, in described magnetic loop system one end near circuitry components, be provided with cooling system assembly; During this cooling system component operation, the large unit of each hear rate is all based on cold drawing, cold drawing to be divided on inner wire cold drawing, outer conductor cold drawing under cold drawing and outer conductor, cooling water is by entering stratified water tanks after water intaking valve, then to enter on inner wire cold drawing, outer conductor cold drawing under cold drawing and outer conductor through red copper pipeline and carry out heat exchange, complete heat finally by outlet valve and export;

Described conductor assembly, comprises and is arranged on the outer conductor assembly of described magnetic loop system near circuitry components one end, and be arranged on the inner conductor component of described magnetic loop system away from circuitry components one end;

Described outer conductor assembly is different with the structure of inner conductor component.

2. a FFT ferrite allotment regulating device according to claim 1, is characterized in that, described magnetic loop system assembly, comprises the first magnetic loop assembly and the second magnetic loop assembly that are equipped with successively.

3. a FFT ferrite allotment regulating device according to claim 2, it is characterized in that, the structure of described first magnetic loop assembly is identical with the structure of the second magnetic loop assembly.

4. a FFT ferrite allotment regulating device according to claim 1, it is characterized in that, described pressure vessel assemblies, comprises cylindrical pressure vessel.