CN205901578U - Wave filter with coupling inductance - Google Patents
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- CN205901578U CN205901578U CN201620617412.4U CN201620617412U CN205901578U CN 205901578 U CN205901578 U CN 205901578U CN 201620617412 U CN201620617412 U CN 201620617412U CN 205901578 U CN205901578 U CN 205901578U
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- 238000010168 coupling process Methods 0.000 title claims abstract description 45
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 45
- 230000008878 coupling Effects 0.000 title claims abstract description 44
- 238000004804 winding Methods 0.000 claims abstract description 11
- 230000005291 magnetic effect Effects 0.000 claims description 48
- 239000003990 capacitor Substances 0.000 claims description 23
- 238000013016 damping Methods 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- LLESOAREQXNYOK-UHFFFAOYSA-N cobalt vanadium Chemical compound [V].[Co] LLESOAREQXNYOK-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229910000889 permalloy Inorganic materials 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 15
- 238000001914 filtration Methods 0.000 abstract description 7
- 230000005389 magnetism Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 14
- 230000010354 integration Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
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- 230000033228 biological regulation Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 litz line Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012913 prioritisation Methods 0.000 description 1
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Abstract
The utility model discloses a wave filter with coupling inductance belongs to power electronic equipment's technical field. The wave filter includes main power branch road inductance, parallel branch inductance and filter capacitance. Main power branch road inductance and parallel branch inductance back -coupling for increased an equivalent coupling inductance in the main power current loop, the rethread concatenates the mode of offsetting the impedance in parallel branch makes parallel branch's equivalent sense value sum be 0, and then this wave filter has the conventional LCL wave filter of 2 inductance to have the same filtering effect with main power current loop cluster. The utility model discloses a main power current loop only needs an inductance, and the wire winding that required main power current loop is thicker is less, simultaneously to it is less to ally oneself with branch current, and the required wire winding of parallel branch inductance is thinner, so compare conventional LCL wave filter, has effectively reduced magnetism spare volume.
Description
Technical field
The utility model discloses the wave filter with coupling inductance, belong to the technical field of power electronic equipment.
Background technology
Traditional pwm commutator or combining inverter, in order to reduce current on line side harmonic wave, are gone here and there in Chang Zhu power current loop
Receipts or other documents in duplicate inductor filter.Current on line side harmonic wave comprises the high-frequency harmonic at switching frequency and its multiple, and single inductance filter is to height
The attenuation characteristic of frequency harmonic wave is not ideal enough, needs larger inductance value to require with the restriction meeting percent harmonic distortion.
Document < jalili k, bernet s.design of lcl filter of active-front-end two-
Level voltage-source converters > ([j] .ieee trans.on industrial electronics,
2009,56 (5): 1674-1684.) point out, lcl wave filter has more preferable High frequency filter effect.The main power of lcl wave filter
In the middle of two inductance of series connection, inductance in current loop, one filter capacitor of parallel connection, is a kind of higher order filter.As Fig. 1, lcl filter
Ripple device is similar to l wave filter in the amplitude-versus-frequency curve of low-frequency range, is declined with the slope of -20db.After resonance point, lcl filters
The amplitude-versus-frequency curve of ripple device is declined with the slope of -60db.Before generally lcl filter resonance point being located at switching frequency, make
Obtain lcl wave filter and single inductance filter is better than to the filter effect of high-frequency harmonic.Therefore, when reaching identical filter effect,
Total sensibility reciprocal needed for lcl wave filter is less than single inductance filter, and this is conducive to reducing magnetic part volume, reduces cost.
Connect in the main power current loop of lcl wave filter two inductance, made inductance, then magnetic according to discrete magnetic part
Core quantity is more, and volume is larger.According to statistics, the weight of magnetic part typically constitutes from the 30～40% of whole device gross weight, and volume then accounts for always
The 20～30% of volume, and the power supply for high frequency, modularized design, the ratio shared by magnetic part weight, volume is also higher.People
Generally reduce the volume of magnetic part and system, weight using putting forward high-frequency method, but improve frequency and can increase power device
Switching loss, affects system effectiveness.Therefore, research staff also studies application integrated magnetic, under conditions of not changing frequency,
Continue to optimize the performance of magnetic part.
So-called integrated magnetic, refers to two or more discrete magnetic parts are wound on a secondary magnetic core, concentrates from structure
Together.Magnetic part after discrete magnetic part is concentrated is referred to as integrated magneticses.Integrated magnetic can effectively reduce the weight of magnetic part, volume
And loss, improve power density.In some occasions, if being designed to work as moreover it is possible to reduce current ripples, or even realize zero ripple.
With the presence or absence of coupling, decoupled integration and coupling integration two can be divided into according between integrated rear each magnetic part by integrated for magnetic
Class.Using decoupling magnetic integrated when, the magnetic flux that the winding of each magnetic part is interlinked is separate, integrated after each magnetic part remain in that
And former discrete magnetic part identical characteristic.During using coupling integration, exist certain between the magnetic flux that the winding of each magnetic part is interlinked
Coupling, thus the characteristic of former discrete magnetic part changes.In some specific occasions, magnetic is integrated can improve changer for coupling
Stable state or dynamic property.
Two inductance of the main power current circuit in series of the multipair greatly lcl wave filter of existing document are studied, such as Central China
Article " in combining inverter, the magnetic of lcl wave filter is integrated " that University of Science and Technology delivers for 2012 (Pan Donghua, Ruan Xinbo, Wang Xuehua,
Bao Chenlei, Li Weiwei, the magnetic of the lcl wave filter in combining inverter is integrated [j]. Chinese motor journal, 2012) and, analyze lcl
The impact to filtering performance for two inductive of wave filter, should be from decoupling it is indicated that coupling integration weakens High frequency filter performance
Integrated Solution, and propose two inductance in lcl wave filter accordingly and forward connect the scheme of decoupled integration.Because winding is forward gone here and there
Connection, the magnetic flux that two inductance produce in low magnetic resistance common magnetic circuit is cancelled out each other, and decreases and uses iron, reach reduce inductance volume,
The effect of weight.
" in three-phase circuit, filter inductance integrated magnetic grinds the article that Nanjing Aero-Space University delivers for 2014
Study carefully " (Liu Hang, Chen Qianhong, the research of filter inductance integrated magnetic in three-phase circuit, the 8th national universities power electronics
With Electric Drive Annual Conference, Wuhan, 2014), have studied the coupling integration side of two inductance in the main loop of power circuit of lcl wave filter
Method, establishes the equivalent-circuit model of the single-phase lcl filter circuit using different coupling integration modes.For coupling electricity in the same direction
Sense, has equivalent negative sense in parallel branch, needs to seal in positive inductance counteracting；For reverse coupled, need Reasonable adjustment resonance point,
Filtering advantage interval is placed at high harmonic content.The inductance integrated approach that article proposes, is ensureing the filter of coupling inductance wave filter
Under conditions of ripple effect, reach reduction inductance volume, the purpose of weight.
How to inquire into that inductance is integrated further, study the filter construction of new employing coupling inductance, ensureing filtering effect
Reduce core volume under conditions of fruit, be a problem being worth thinking.
Utility model content
The purpose of this utility model is to propose a kind of wave filter with coupling inductance and its parameter determination method, using coupling
Close inductance, devise a kind of new filter construction, compare conventional lcl wave filter, decrease the inductance number on main loop of power circuit,
Reduce magnetic part volume under conditions of ensureing filter effect.
This utility model is to realize above-mentioned utility model purpose to adopt the following technical scheme that
Wave filter with coupling inductance, comprising: only include the main power leg of the first inductance, the second inductance and filtering
Electric capacity and offset the parallel branch that is composed in series of impedance, main power leg and parallel branch composition two-port network, described two
In port network, either port connects another port during alternating-current voltage source and connects rectification circuit or inverter circuit.
The first terminal of the first inductance is connected with second inductance one end, and the second inductance other end connects with offsetting impedance one end
Connect, offset the impedance other end and be connected with a pole of filter capacitor, another pole structure of the Second terminal of the first inductance and filter capacitor
Become a port of described two-port network, the junction point of the first inductance and the second inductance constitutes institute with another pole of filter capacitor
State another port of two-port network, the first inductance and the second inductance reverse coupled.
Further, the counteracting impedance in the described wave filter with coupling inductance is single inductance or single capacitor or inductance electricity
Hold connection in series-parallel combination, using single inductance as counteracting inductance under wide frequency ranges.
The step entered, the described wave filter with coupling inductance also includes damping resistance, and damping resistance is serially connected in parallel connection
In branch road or be connected in parallel between the two poles of the earth of filter capacitor.
Further, in the described wave filter with coupling inductance, the magnetic core of the first inductance and the second inductance is stalloy
Or the magnetic core of ferrite or crystallite or ultracrystallite or permalloy or ferrum cobalt vanadium material.
Further, in the described wave filter with coupling inductance, the first inductance is solid leading with the winding of the second inductance
Line or the winding of litz line or copper sheet or pcb coiling.
The parameter determination method of the described wave filter with coupling inductance, obtains described carrying using Method of Eliminating Mutual Inductance and couples
The equivalent circuit of the wave filter of inductance, adjusts the first inductance and the inductance value of the second inductance and the coefficient of coup makes parallel branch first-class
Effect inductance value anon-normal, in parallel branch, concatenation makes the counteracting impedance that equivalent inductance value sum in parallel branch is 0, so that described
Wave filter with coupling inductance is equivalent to conventional lcl wave filter.
As the further prioritization scheme of the parameter determination method of the described wave filter with coupling inductance, described regulation
The inductance value of one inductance and the second inductance and the coefficient of coup make equivalent inductance value anon-normal in parallel branch, particularly as follows: adjusting coupling
Coefficient is 1, and adjusts the inductance value that the inductance value of the first inductance is more than the second inductance.
This utility model adopts technique scheme, has the advantages that
(1) main power leg inductance and parallel branch inductance reverse coupled are so that increased one in main power current loop
Individual equivalent coupled inductance, then make the equivalent inductance value sum of parallel branch be by way of concatenation offsets impedance in parallel branch
0, then the conventional lcl wave filter that this wave filter has 2 inductance with main power current loop string has identical filter effect.
(2) main power current loop of the present utility model only needs an inductance, required main power current loop thicker around
Line is less, and meanwhile, parallel branch electric current is less, and coiling needed for parallel branch inductance is thinner, so comparing conventional lcl wave filter,
Effectively reduce magnetic part volume.
Brief description
Fig. 1 is lcl wave filter and single inductance filter amplitude frequency curve contrast；
Fig. 2 is conventional lcl wave filter universal circuit structure；
Fig. 3 is conventional lcl wave filter low frequency equivalent circuit；
Fig. 4 is conventional lcl filter high-frequency equivalent circuit；
Fig. 5 is lcl wave filter emulation experiment waveform；
Fig. 6 is the circuit diagram of the wave filter a with reverse coupled inductance of the present utility model；
Fig. 7 is the equivalent electric that the wave filter a with reverse coupled inductance of the present utility model is obtained using Method of Eliminating Mutual Inductance
Road；
Fig. 8 is lcl filter inductance Entity measurement amplitude frequency curve；
Fig. 9 is the inductance Entity measurement amplitude frequency curve of the wave filter a with reverse coupled inductance of the present utility model；
Figure 10 is the circuit diagram of the wave filter b with reverse coupled inductance of the present utility model；
Figure 11 is the equivalent electric that the wave filter b with reverse coupled inductance of the present utility model is obtained using Method of Eliminating Mutual Inductance
Road；
Figure 12 is that application in single-phase inversion circuit for the wave filter a with reverse coupled inductance of the present utility model is real
Example；
Figure 13 is simulation waveform and the current spectrum of conventional lcl wave filter；
Figure 14 is that the counteracting inductance in the wave filter a with reverse coupled inductance of the present utility model is completely counterbalanced by simultaneously
Simulation waveform after connection branch road equivalent negative sense and current spectrum；
Figure 15 is the filter schematic that n phase carries coupling inductance.
In figure label declaration: ugFor alternating-current voltage source, urFor rectification or inverter side equivalent voltage source, laBased on power leg
Inductance, lbFor parallel branch inductance, the mutual inductance of power leg inductance and parallel branch inductance, c based on mfFor filter capacitor, r is resistance
Buffer resistance, laddFor offsetting inductance, n represents n wave filter, s1～s4For switching tube, d1～d4For backward diode, c1～c4For
Parasitic capacitance.
Specific embodiment
Below in conjunction with the accompanying drawings the technical scheme of utility model is described in detail.
Conventional lcl wave filter is as shown in Fig. 2 be serially connected with inductance l on main power leg1With inductance l2, parallel branch has string
The filter capacitor c connecingfWith damping resistance r composition.No. 1 terminal of two-port network and the indirect alternating-current voltage source u of No. 2 terminalsg,
No. 3 terminals of two-port network and the indirect rectification/inverter circuit of No. 4 terminals, rectification or inverter side equivalent voltage source are ur.Figure
Equivalent circuit during conventional lcl wave filter low frequency shown in 2 as shown in figure 3, filter capacitor impedance is larger, approximately open by parallel branch
Road, now lcl wave filter be equivalent to inductance l1With inductance l2The single inductance filter being composed in series；Conventional lcl filtering shown in Fig. 1
As shown in figure 4, filter capacitor impedance diminishes, high-frequency harmonic is mainly bypassed equivalent circuit during device high frequency by parallel branch, therefore right
The filter capacity of high-frequency harmonic is stronger.
As shown in figure 5, from the emulation experiment waveform of lcl wave filter, main power current loop flows through inductance l1
With inductance l2Electric current i1And i2Size is similar, and parallel branch electric current icIt is about i22.2%, much smaller than main power current loop
Electric current.
This utility model does not make two inductance decouplings or coupling collection on lcl wave filter main power current loop using traditional
The method becoming, but the inductance number in main power current loop is kept to one.Main power leg inductance is anti-with parallel branch inductance
To coupling so that increased an equivalent coupled inductance in main power current loop, then offset by concatenation in parallel branch
It is 0 that the mode of impedance makes the equivalent inductance value sum of parallel branch, then this wave filter and main power current loop string have 2 inductance
Conventional lcl wave filter has identical filter effect.
Main power current loop of the present utility model only needs an inductance, and the thicker coiling in required main power current loop is relatively
Few, meanwhile, parallel branch electric current is less, and coiling needed for parallel branch inductance is thinner, so comparing conventional lcl wave filter, effectively
Reduce magnetic part volume.
For the utility model proposes the wave filter with coupling inductance and parameter determination method, there is shown herein emulation
Experiment, and made material object, the wave filter demonstrating the application design is feasible.
Specific embodiment one
Wave filter a with reverse coupled inductance as shown in Figure 6, comprising: the main power leg inductance l of reverse coupleda
(the first inductance as in claim) and parallel branch inductance lb(the second inductance as in claim), filter capacitor
cfAnd offset inductance ladd, parallel branch inductance lb, offset inductance ladd, filter capacitor cfIt is composed in series parallel branch, Two-port netwerk
No. 1 terminal of network and the indirect alternating-current voltage source u of No. 2 terminalsg, No. 3 terminals of two-port network and No. 4 terminals indirectly whole
Stream/inverter circuit, rectification or inverter side equivalent voltage source are ur.In parallel branch, the damping resistance r of concatenation is used for suppressing lcl to filter
The resonance spikes of ripple device, are beneficial to stablizing of system, and damping resistance r can also be attempted by filter capacitor cfBetween the two poles of the earth.
The equivalent circuit of Fig. 6 is obtained as shown in fig. 7, main power leg inductance l using Method of Eliminating Mutual InductanceaWith parallel branch electricity
Sense lbIt is equivalent to the l being connected on main power lega- m and m and be connected on the l in parallel branchbPower leg based on-m, m
Inductance laWith parallel branch inductance lbMutual inductance.Adjust main power leg inductance laInductance value, parallel branch inductance lbInductance value,
Main power leg inductance laWith parallel branch inductance lbCoefficient of coup k so that equivalent inductance value l in parallel branchb- m is anon-normal
Value, then concatenation makes the counteracting inductance l that inductance value sum in parallel branch is 0 in parallel branchadd, then wave filter a can be equivalent
For conventional lcl wave filter, have and conventional lcl wave filter identical filter effect.Main power current loop of the present utility model
Only need an inductance, the thicker coiling in required main power current loop is less, and meanwhile, parallel branch electric current is less, parallel branch
Inductance and coiling needed for counteracting inductance are thinner, so comparing conventional lcl wave filter, effectively reduce magnetic part volume.
Figure 12 is the application example in single-phase inverter of wave filter a shown in Fig. 6.Input direct voltage 400v,
Output AC voltage 220v, output 1.2kw, switching frequency 24khz.Inverter circuit includes switching tube s1～s4, switching tube leakage
All it is connected to backward diode d between pole and source electrode1～d4With parasitic capacitance c1～c4, main power leg inductance la=4.8mh, in parallel
Shunt inductance lb=0.56mh, coefficient of coup k=1, offset inductance ladd=1.08mh, filter capacitor cf=4.4uf, damping resistance
R=0.47 ω.
Figure 13 is the simulation result in single-phase inversion circuit using conventional lcl wave filter, can see from current spectrum,
Inductance l1On the electric current i that flows through1High-frequency harmonic be mainly distributed on 24khz times for several times near, by the high frequency of filter capacitor
Road acts on, inductance l2On the electric current i that flows through2High fdrequency components very little, be concentrated mainly near 24khz, maximum amplitude is
6.97ma.Figure 14 is the simulation result of the wave filter a using reverse coupled inductance, offsets inductance laddWith on capacitive branch etc.
Effect inductance lbThe absolute value of-m is equal, is completely counterbalanced by, and makes wave filter a shown in Fig. 6 reach the filter same with lcl wave filter
Ripple effect is it is ensured that the High frequency filter effect of wave filter.Can see from current spectrum, inductance l2On the electric current i that flows through2?
Maximum amplitude near 24khz is 6.96ma, and lcl wave filter is similar with no coupling.
Make lcl wave filter respectively according to inductance parameters and the inductance of coupling inductance wave filter is in kind.Lcl wave filter
Two inductance adopt ee70b and ee65 magnetic core, and the coupling inductance of coupling inductance wave filter adopts ee85a magnetic core, offsets inductance and adopts
Nps050060 magnet ring with Bo Ke company.Main loop of power circuit inductance coiling adopts 0.1 × 160 litz wire, parallel branch inductance
And offset the litz wire that inductance coiling adopts 0.07 × 14.Fig. 8, Fig. 9 are respectively and use agilent e5061b type analysis of network
The measurement result to lcl wave filter and the amplitude frequency curve of coupling inductance wave filter for the instrument.During due to actual fabrication, offset inductance and be difficult to
It is completely counterbalanced by the equivalent negative sense in parallel branch, so the amplitude frequency curve of two filter has a difference in the resonance point second half section, but
Before 100khz frequency, the gain of two curves is closer to, for switching frequency frequency nearby and its at multiple of 24khz
High-frequency harmonic all has larger attenuation rate.Contrast table 1 two filter magnetic part volume and understanding, coupling inductance filter of the present utility model
Ripple device saves 20.8% magnetic part volume.
Table 1
Filter capacitor can adopt single capacitor, it would however also be possible to employ the connection in series-parallel of many electric capacity.Main power leg inductance, parallel branch
The magnetic core of inductance and counteracting inductance adopts ferromagnetic material such as stalloy, ferrite, crystallite, ultracrystallite, permalloy or ferrum cobalt vanadium.
Main power leg inductance, parallel branch inductance and counteracting inductor winding adopt solid conductor, litz line, copper sheet or pcb winding
Form.Alternating-current voltage source can be single-phase, three-phase or multiphase, rectification circuit can using bridge-type, half-wave, all-wave, multiplication of voltage or
Stream rectifying and wave-filtering again, inverter circuit can adopt bridge-type, half-wave, single-phase, multi-phase inverter circuit.For n commutating phase/inversion electricity
Road, the n wave filter with coupling inductance can be connected between alternating-current voltage source and rectification/inverter circuit, as shown in figure 15.
From this example, the structure of this utility model wave filter can be with equivalent lcl wave filter, simultaneously using coupling magnetic
Integrated technology decreases magnetic part volume weight, can bring good economic benefit, has good development prospect.
Specific embodiment two
Wave filter b with reverse coupled inductance as shown in Figure 10, the annexation of main power leg and parallel branch with
Specific embodiment one is identical, No. 1 terminal of two-port network and indirect rectification/inverter circuit, rectification or the inverter side of No. 2 terminals
Equivalent voltage source is ur, No. 3 terminals of two-port network and the indirect alternating-current voltage source u of No. 4 terminalsg.Filter parameter design side
Method is identical with specific embodiment one, Figure 11 be wave filter b with reverse coupled inductance using Method of Eliminating Mutual Inductance obtain equivalent
Circuit.
Claims (5)
1. carry coupling inductance wave filter it is characterised in that include: only include the first inductance (l a) main power leg,
Two inductance (l b) and filter capacitor (c f) and counteracting impedance (l add) parallel branch that is composed in series, main power leg and in parallel
Road forms two-port network, and in described two-port network, either port connects another port during alternating-current voltage source and connects rectification circuit or inverse
Become circuit,
First inductance (l a) the first terminal and the second inductance (l b) one end connection, the second inductance (l b) other end with offset impedance
(l add) one end connection, counteracting impedance (l add) other end and filter capacitor (c f) one pole connect, the first inductance (l a) the second end
Son with filter capacitor (c f) another pole constitute a port of described two-port network, the first inductance (l a) and the second inductance
(l b) junction point and filter capacitor (c f) another pole constitute another port of described two-port network, the first inductance (l a)
With the second inductance (l b) reverse coupled.
2. carry the wave filter of coupling inductance according to claim 1 it is characterised in that described counteracting impedance be single inductance or
The connection in series-parallel combination of single capacitor or inductance capacitance, using single inductance as counteracting impedance under wide frequency ranges.
3. carry the wave filter of coupling inductance according to claim 1 it is characterised in that described wave filter also includes damping electricity
Resistance (r), described damping resistance (r) be serially connected in parallel branch or be connected in parallel on filter capacitor (c f) the two poles of the earth between.
4. the wave filter with coupling inductance according to claim 1 it is characterised in that described first inductance (l a) and the
Two inductance (l b) magnetic core be stalloy or ferrite or crystallite or ultracrystallite or permalloy or ferrum cobalt vanadium material magnetic core.
5. the wave filter with coupling inductance according to claim 1 it is characterised in that described first inductance (l a) and the
Two inductance (l b) winding be solid conductor or litz line or copper sheet or pcb coiling winding.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105958809A (en) * | 2016-06-21 | 2016-09-21 | 南京航空航天大学 | Filter with coupled inductor and parameter determining method of filter |
| CN111022276A (en) * | 2019-12-27 | 2020-04-17 | 哈尔滨工业大学 | Hall effect thruster low-frequency oscillation suppression outer loop |
-
2016
- 2016-06-21 CN CN201620617412.4U patent/CN205901578U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105958809A (en) * | 2016-06-21 | 2016-09-21 | 南京航空航天大学 | Filter with coupled inductor and parameter determining method of filter |
| CN111022276A (en) * | 2019-12-27 | 2020-04-17 | 哈尔滨工业大学 | Hall effect thruster low-frequency oscillation suppression outer loop |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |