CN108492958B - A kind of tandem multiphase is interlocked coupling inductance structure and its control method - Google Patents
A kind of tandem multiphase is interlocked coupling inductance structure and its control method Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
- H01F17/06—Fixed inductances of the signal type with magnetic core with core substantially closed in itself, e.g. toroid
- H01F17/062—Toroidal core with turns of coil around it
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
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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
- H02M1/00—Details of apparatus for conversion
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Abstract
Interlock coupling inductance structure and its control method the invention discloses a kind of tandem multiphase, it is made of several concatenated multiphase coupled inductance units, each multiphase coupled inductance unit uses and winds N number of winding coil on single magnetic core, the successively positive and negative coupling of N number of winding coil, N are the number of phases of coupling inductance；The magnetic core of each multiphase coupled inductance unit is using annular magnet ring structure；Odd number phase winding on each magnetic core is around to identical, and even number phase winding is around to identical, and Odd Phases and even number phase winding are around on the contrary, to realize each winding successively positive and negative coupling on each magnetic core.Tandem multiphase proposed by the present invention coupling inductance of interlocking can improve the dynamic property of coupling inductance simultaneously and steady-state performance and reduce coupling inductance volume, with than the complete bigger equivalent steady state inductance optimization range of negative coupled modes, and it can realize the coefficient of coup design value of gamut.
Description
Technical field
Interlock coupling inductance technical field used in code converter the present invention relates to multiphase, more particularly to a kind of series connection
Formula multiphase is interlocked coupling inductance structure and its control method.
Background technique
With the fast development in the fields such as generation of electricity by new energy, electric car, energy-storage system, non-isolation type DC-DC converter
It has received widespread attention.In many occasions, as fuel cell, airplane power source, communication power supply, radar transmitter, electroplating power supply,
There is very high want in the applications such as server power supply to the power grade, current ripples, transducer dimensions etc. of DC power supply
It asks, therefore high performance non-isolation type multiphase interleaving DC-DC converter has the huge market demand.
In the prior art, traditional multiphase interleaving DC-DC converter uses separate inductor, and this solution makes
Converter be difficult in terms of the phase current ripple (i.e. steady-state performance) of inductance, converter dynamic property and transducer dimensions three into
One step is promoted.It is traditional using separate inductor to converter dynamic property, steady-state performance and the more demanding occasion of size
Design requirement may be not achieved in solution.
Have some integrated magnetics at present, by the way of the negative coupling of multiphase, by traditional Interleaved control method, to mention
The dynamic and steady-state performance of high converter.But converter coupling coefficient range used by this solution is limited, coupling electricity
The maximum coefficient of coup of sense is inversely proportional with the number of phases is coupled, i.e., with the increase of the coupling number of phases, the maximum coefficient of coup of coupling inductance
It is reduced rapidly, this brings difficulty to designing and producing for coupling inductance.At the same time, the mode of complete negative coupling, so that coupling electricity
The equivalent steady state inductance value promotion of sense is not obvious, by under different duty and the different coefficients of coup coupling inductance it is equivalent steady
State inductance surface chart can be seen that the mode of this complete negative coupling, under large-scale duty ratio and the coefficient of coup, equivalent steady state
Separation inductance value when inductance value is not than coupling reduce it is obvious, if that is, converter obtains higher transient performance and stability simultaneously
Can, the volume of coupling inductance need to be sacrificed, the self-inductance of each phase of coupling inductance is significantly increased.
In conclusion the dynamic property of coupling inductance, steady-state performance and coupling inductance volume three condition each other, it is existing
The integrated magnetic and control method of complete negative coupling are only capable of preferably improving the dynamic property and steady-state performance of coupling inductance, but
The volume of coupling inductance cannot be reduced simultaneously, and this method is limited to the hoisting power of steady-state performance, and there is maximum coupling
The limitation of coefficient, it is difficult to extend to multiphase and there is production difficulty when being used in multi-phase converter.
At present for improving the dynamic property of coupling inductance, steady-state performance simultaneously and reducing coupling inductance volume, still lack
Effective solution scheme.
Summary of the invention
In order to solve the deficiencies in the prior art, one of the object of the invention is to provide a kind of tandem multiphase and interlocks coupling inductance
Structure, dynamic property and steady-state performance for improving coupling inductance while, reduce coupling inductance volume, with bigger etc.
Stable state inductance optimization range is imitated, and can realize the coefficient of coup design value of gamut.
A kind of tandem multiphase is interlocked coupling inductance structure, comprising:
Several multiphase coupled inductance units being connected in series, each multiphase coupled inductance unit uses to be wound on single magnetic core
N number of winding coil, the successively positive and negative coupling of N number of winding coil, N are the number of phases of coupling inductance；Each multiphase coupled inductance list
The magnetic core of member is using annular magnet ring structure；
Odd number phase winding on each magnetic core is around to identical, and even number phase winding is around to identical, Odd Phases and even number phase
Winding is around on the contrary, to realize each winding successively positive and negative coupling on each magnetic core.
The series system of further technical solution, the multiphase coupled inductance unit is each multiphase coupled inductance list
Each phase winding in member enters end and is connected with the outlet of corresponding winding in a upper multiphase coupled inductance unit, each multiphase coupling
Each phase winding outlet closed in inductance unit is connected with the end that enters of corresponding winding in next multiphase coupled inductance unit, the
Each phase winding of one multiphase coupled inductance unit enters end and enters end, the last one multiphase coupling for total each phase winding of coupling inductance
The outlet for closing each phase winding of inductance unit is the outlet of total each phase winding of coupling inductance.
The total volume of the coupling inductance determines that concatenated series is more, coupling inductance by the concatenated series of coupling inductance
Total volume it is smaller.
Since series is more, in the identical situation of total self-induction, the number of turns needed for the winding of every level-one is smaller, corresponding at different levels
Perimeter needed for magnet ring is smaller, the volume of magnet ring and perimeter it is square directly proportional, volume is then reduced with square speed, so series connection
Series is more, and coupling inductance total volume is smaller.
A kind of tandem multiphase is interlocked the making step of the multiphase coupled inductance unit of each of coupling inductance structure are as follows:
(1) coupling inductance unit is equivalent when being controlled under the different numbers of phases of drafting using the different coefficients of coup and different duty
Stable state inductance diagram of block；
(2) converter work is determined in nominal duty cycles, and when equivalent steady state inductance maximum of coupling inductance is corresponding
Best Coupling coefficient；
(3) electric current that each phase inductance flows through is calculated according to the design power of converter, determines winding wire diameter；
(4) the coupling inductance size reached according to needed for determines concatenated series needed for coupling inductance；
(5) according to toroidal core, in different magnetic resistance and winding, the corresponding coefficient of coup relationship under different the number of turns, determination are every
The toroidal core size and umber of turn of a annular coupling inductance.
In the step (1), when according to circuit steady operation, inductance has the spy of voltage-second balance in a switch periods
Property, steady state relation formula is write to multiphase coupled inductance matrix column accordingly, by mathematic(al) manipulation to the coupling inductance in steady state relation formula
Part is decoupled, and the Equivalent Decoupling stable state inductance of multiphase coupled inductance can be obtained；It is from change with the coefficient of coup and duty ratio
Amount, Equivalent Decoupling stable state inductance are dependent variable, coupling inductance list when can draw the different coefficients of coup and different duty control
The equivalent steady state inductance diagram of block of member.
Value of the Equivalent Decoupling inductance under different duty and the different coefficients of coup is different, and equivalent steady state inductance is bigger, says
Bright by after independent inductive coupling, equivalent stable state inductance obtained is bigger, can preferably reduce inductance ripple in this way, mention
The steady-state performance of high converter.Equivalent steady state inductance diagram of block described in text, in the case of describing same winding, difference is accounted for
Sky compares the situation of change with equivalent steady state inductance under the coefficient of coup, and by the selection of duty ratio and the coefficient of coup, determination makes equivalent
The performance of coupling inductance can be optimal by duty ratio and the coefficient of coup when coupling inductance maximum in this way.
In the step (2), in the design of real transform device, duty ratio and the coefficient of coup are influenced by many factors.It is right
The selection of duty ratio and the coefficient of coup, and according to the design of different converters carry out many factors the considerations of, in conjunction with reality
Determine the solution of duty ratio and the coefficient of coup, the diagram of block of this paper is only provided from the best of coupling inductance angle consideration
Design method, but in the design of real transform device, generally nominal duty cycles are calculated first according to the function of converter, it is basic herein
On the coefficient of coup is selected, be finally completed the design of coupling inductance.
It is that the coupled modes and control mode of coupling inductance, the two combine lower coupling inductance in place of main innovation of the present invention
The improvement of performance.The specific design of electric current and line footpath can refer to the method for being typically designed, such as can be with reference to " the magnetic member of Switching Power Supply
Part is theoretical and design " design method.
The specific coefficient of coup relationship of the present invention can refer to specific manufacture craft in terms of coupling inductance.
The principal element for only considering influence coupling inductance volume, when series increases, perimeter needed for every phase magnet ring becomes smaller,
The volume approximation of every phase magnet ring is directly proportional to the quadratic power of perimeter, it is known that and series increase may make coupling inductance total volume to reduce,
Since the factor for influencing inductor size is excessive, and it is related to inductance production level, only provides rough conclusion here, is i.e. increase coupling
Inductance series is closed, coupling inductance total volume can be made to reduce.The invention mainly relates to the optimizations of inductive coupling mode and control mode.
Further, the multiphase coupled inductance unit of the tandem can be used for needing the electricity of the converter of multiphase Interleaved control
Lu Zhong, as conventional multiphase interlocks DC-DC converter.
Tandem multiphase is interlocked the control method of coupling inductance structure, the control mode of the multiphase coupled inductance unit of tandem
For 180 ° of Interleaved control modes, i.e., the charging and discharging state of adjacent winding successively lags 180 ° of phase angles.
Further, the equivalent steady state inductance value (being indicated with per unit value) of the multiphase coupled inductance unit of the tandem are as follows:
Wherein, LeqFor the equivalent steady state inductance value of the multiphase coupled inductance unit of tandem, L is and the multiphase coupled electricity of tandem
Feel the identical independent electrical inductance value of each phase self-induction of unit, D is duty ratio, and k is the coefficient of coup.
Equivalent steady state inductance value of the present invention, after capable of illustrating the coupling of multiphase separate inductor, equivalent stable state inductance
It is worth the variation generated, concretely, after separate inductor coupling, equivalent stable state inductance value is in certain duty ratio and coupling range
Under can become larger namely separate inductor coupling after, be equivalent to and used bigger separate inductor, thus separate inductor coupling after can mention
Rise the steady-state characteristic of converter.Expression formula is the basis of equivalent steady state inductance diagram of block above in text, is expressed by this
Formula can draw diagram of block, then comprehensively consider various aspects design according to specific converter design demand by surface chart
Demand preferentially chooses duty ratio and the coefficient of coup.
Further, the equivalent transient inductance value (being indicated with per unit value) of the multiphase coupled inductance unit of the tandem are as follows:
Wherein, LtrFor the equivalent transient inductance value of the multiphase coupled inductance unit of tandem, L is and the multiphase coupled electricity of tandem
Feel the identical independent electrical inductance value of each phase self-induction of unit, k is the coefficient of coup.
It can be seen from the equivalent transient inductance expression formula of the multiphase coupled inductance unit of the tandem with separate inductor phase
Become smaller than its equivalent transient inductance value, the dynamic response of converter becomes faster, therefore the transient performance of converter can be improved.
Further, each phase winding of the successively positive and negative coupling, when be positive between winding couple when, coefficient of coup k's
Range is 0 < k < 1, when be negative between winding couple when, the range of coefficient of coup k is -1 < k < 0.
Further, 180 ° of Interleaved control modes, by taking conventional multiphase DC-DC converter as an example, to be opened per corresponding
It closes pipe on state and successively lags 180 ° of phase angles.
Compared with prior art, the beneficial effects of the present invention are:
Tandem multiphase proposed by the invention is interlocked coupling inductance solution, has broader coupling coefficient range,
It is easily designed.And equivalent steady state inductance increases after can realizing inductive coupling in very big duty ratio and coupling coefficient range,
And increase the solution that multiple is significantly greater than complete negative coupling, the coupling inductance so tandem multiphase proposed by the present invention is interlocked
With better stable state inductance performance.At the same time, tandem multiphase proposed by the present invention interlocks coupling inductance with smaller
Equivalent transient inductance, so tandem multiphase proposed by the present invention is interlocked, coupling inductance has better transient performance.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is the described four mutually positive and negative concatenated coupling inductance structures of coupling level Four；
Fig. 2 for using mentioned novel serial multiphase interlock coupling inductance tradition four staggered parallel connection DC-DC it is topological；
Fig. 3 is opens using the interlock staggered parallel connection DC-DC topology of tradition four of coupling inductance of mentioned novel serial multiphase
Close control signal；
Fig. 4 is that inductance unit is coupled with tandem four respectively mutually from the identical separate inductor structure of inductance value；
Fig. 5 (a) be the tandem four be coupled inductance unit equivalent steady state inductance in different duty and different couplings
Close corresponding equivalence value under coefficient range；
Fig. 5 (b) is the side view of Fig. 5 (a)；
Fig. 6 (a) be using the four of complete negative coupled modes be coupled inductance unit equivalent steady state inductance in different duty
With equivalence value corresponding under different coupling coefficient ranges；
Fig. 6 (b) is the side view of Fig. 6 (a).
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
In a kind of typical embodiment of the application, as shown in Figure 1, providing a kind of four mutually positive and negative couplings of level Four series connection
Coupling inductance, use traditional four phase DC-DC converter topologys to verify the performance of coupling inductance.The level Four is connecting four phases just
The coupling inductance structure of negative coupling is as shown in Figure 1.
The four concatenated coupling inductance of mutually positive and negative coupling level Four includes four concatenated four inductance units that are coupled, each
Four inductance units that are coupled successively are made by the way of positive and negative coupling using winding four winding coils on single magnetic core.
The preferred core structure of the implementation case is annular magnet ring structure.
1,3 phase windings on each magnetic core are around to identical, and 2,4 phase windings are around to identical, and 1 winding and 2,4 windings are around to phase
Instead, 3 windings and 2,4 windings to realize on magnetic core that each winding is successively positive and negative around on the contrary, couple, i.e. mutual inductance M12、M14、M23、M34
It is negative, mutual inductance M13、M24It is positive.
The series system of four four inductance units that are coupled is, each four each phase windings being coupled on inductance enter end with it is upper
The outlet of corresponding winding is connected on one multiphase coupled inductance, each four be coupled inductance each phase winding outlet with it is next
A four ends that enter of corresponding winding on inductance that are coupled are connected, and it is total that each phase winding of first four inductance that is coupled, which enters end,
Each phase winding of coupling inductance enter end, the last one four be coupled inductance each phase winding outlet be total each phase of coupling inductance
The outlet of winding.
It is coupled compared with inductance with single four, inductance is coupled with smaller volume and more greatly using level Four concatenated four
Heat dissipation area.
As preferred specific implementation case, interlock the performance of coupling inductance to verify proposed novel serial multiphase, it is electric
Road topology is using the staggered parallel connection DC-DC topology of tradition four, as shown in Figure 2.
Only by taking converter works in boost operating mode as an example, switching tube S1、S3、S5、S7On state successively lags
180 ° of phase angles, switching tube S2、S4、S6、S8Using synchronous rectification mode, with S1、S3、S5、S7On state complementation (does not consider here
Dead zone).Control signal such as Fig. 3 of switching tube, duty cycle range are 0 < D < 1.
When the symmetrical coiling of each winding, four are coupled inductance matrix are as follows:
The matrix is intended to mean that the feature of the positive and negative coupling of coupling inductance, the matrix simple and clear show the present invention with
Have the difference of negative coupling inductance technology, multi-phase converter design in, the matrix be fundamental matrix, for converter analysis and
It calculates.
The tandem four is coupled the equivalent steady state inductance value (being indicated with per unit value) of inductance unit are as follows:
Wherein, LeqIt is coupled the equivalent steady state inductance value of inductance unit for tandem four, L is the electricity that is coupled with tandem four
Feel the identical independent electrical inductance value of each phase self-induction of unit, k is the coefficient of coup.
The tandem four is coupled the equivalent transient inductance value (being indicated with per unit value) of inductance unit are as follows:
Wherein, LtrIt is coupled the equivalent transient inductance value of inductance unit for tandem four, L is the electricity that is coupled with tandem four
Feel the identical independent electrical inductance value of each phase self-induction of unit, k is the coefficient of coup.
Being coupled with tandem four, respectively phase is as shown in Figure 4 from the identical separate inductor structure of inductance value for inductance unit.
The tandem four be coupled inductance unit equivalent steady state inductance in different duty and different coefficient of coup models
Corresponding equivalence value such as Fig. 5 (a) under enclosing, side view such as Fig. 5 (b).
In the integrated magnetic of existing complete negative coupling, using the four of complete negative coupled modes be coupled inductance unit etc.
Imitate stable state inductance corresponding equivalence value such as Fig. 6 (a) under different duty and different coupling coefficient ranges, side view such as Fig. 6
(b)。
The coupling inductance solution as it can be seen that tandem multiphase proposed by the invention is interlocked has the broader coefficient of coup
Range, it is easily designed.And equivalent steady state inductance after inductive coupling can be realized in very big duty ratio and coupling coefficient range
Increase, and increases the solution that multiple is significantly greater than complete negative coupling, the coupling so tandem multiphase proposed by the present invention is interlocked
Closing inductance has better stable state inductance performance.At the same time, tandem multiphase proposed by the present invention coupling inductance of interlocking has
Smaller equivalent transient inductance, so tandem multiphase proposed by the present invention is interlocked, coupling inductance has better transient performance.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (9)
- The coupling inductance structure 1. a kind of tandem multiphase is interlocked, characterized in that include:Several multiphase coupled inductance units being connected in series, each multiphase coupled inductance unit are N number of using winding on single magnetic core Winding coil, the successively positive and negative coupling of N number of winding coil, N are the number of phases of coupling inductance；Each multiphase coupled inductance unit Magnetic core is using annular magnet ring structure；Around to identical, even number phase winding is odd around to identical for odd number phase winding on each magnetic core Number is mutually and even number phase winding is around on the contrary, to realize each winding successively positive and negative coupling on each magnetic core；The equivalent steady state inductance value of the multiphase coupled inductance unit of tandem is indicated with per unit value are as follows:Wherein, LeqFor the equivalent steady state inductance value of the multiphase coupled inductance unit of tandem, L is and the multiphase coupled inductance list of tandem The identical independent electrical inductance value of each phase self-induction of member, D is duty ratio, and k is the coefficient of coup.
- The coupling inductance structure 2. a kind of tandem multiphase as described in claim 1 is interlocked, characterized in that the multiphase coupled electricity Feel the series system of unit are as follows: each phase winding in each multiphase coupled inductance unit enters end and upper one multiphase coupled inductance list The outlet of corresponding winding is connected in member, each phase winding outlet in each multiphase coupled inductance unit and next multiphase coupling The end that enters for closing corresponding winding in inductance unit is connected, and it is total that each phase winding of first multiphase coupled inductance unit, which enters end, Each phase winding of coupling inductance enters end, and the outlet of each phase winding of the last one multiphase coupled inductance unit is total coupling inductance The outlet of each phase winding.
- The coupling inductance structure 3. a kind of tandem multiphase as described in claim 1 is interlocked, characterized in that the coupling inductance Total volume determines that concatenated series is more by the concatenated series of coupling inductance, and the total volume of coupling inductance is smaller.
- The coupling inductance structure 4. a kind of tandem multiphase as described in claim 1 is interlocked, characterized in that the tandem multiphase Coupling inductance unit can be used for needing in the circuit of the converter of multiphase Interleaved control.
- The coupling inductance structure 5. a kind of tandem multiphase as described in claim 1 is interlocked, characterized in that the tandem multiphase The equivalent transient inductance value of coupling inductance unit is indicated with per unit value are as follows:Wherein, LtrFor the equivalent transient inductance value of the multiphase coupled inductance unit of tandem, L is and the multiphase coupled inductance list of tandem The identical independent electrical inductance value of each phase self-induction of member, k is the coefficient of coup.
- The control method of coupling inductance structure 6. a kind of tandem multiphase as described in claim 1 is interlocked, characterized in that series connection The control mode of the multiphase coupled inductance unit of formula is 180 ° of Interleaved control modes, i.e., the charging and discharging state of adjacent winding successively lags 180 ° of phase angles.
- The control method of coupling inductance structure 7. a kind of tandem multiphase as claimed in claim 6 is interlocked, characterized in that described Successively each phase winding of positive and negative coupling, when be positive between winding couple when, the range of coefficient of coup k is 0 < k < 1, when being between winding When negative coupling, the range of coefficient of coup k is -1 < k < 0.
- The control method of coupling inductance structure 8. a kind of tandem multiphase as claimed in claim 6 is interlocked, characterized in that described 180 ° of Interleaved control modes, successively to lag 180 ° of phase angles per corresponding switching tube on state.
- The multiphase coupled inductance unit of each of coupling inductance structure 9. a kind of tandem multiphase as described in claim 1 is interlocked Production method, characterized in that step are as follows:(1) equivalent steady state of coupling inductance unit when controlling under the different numbers of phases using the different coefficients of coup and different duty is drawn Inductance diagram of block；(2) determine converter work in nominal duty cycles, when equivalent steady state inductance maximum of coupling inductance corresponding best The coefficient of coup；(3) electric current that each phase inductance flows through is calculated according to the design power of converter, determines winding wire diameter；(4) the coupling inductance size reached according to needed for determines concatenated series needed for coupling inductance；(5) according to toroidal core in different magnetic resistance and winding the corresponding coefficient of coup relationship under different the number of turns, determine each ring The toroidal core size and umber of turn of shape coupling inductance.
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| CN104021920A (en) * | 2014-05-27 | 2014-09-03 | 华为技术有限公司 | Coupling inductor and power converter |
| CN107180697A (en) * | 2017-05-12 | 2017-09-19 | 辽宁工程技术大学 | A kind of building method of novel matrix formula multiple degrees of freedom coupling inductance |
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| CN107180697A (en) * | 2017-05-12 | 2017-09-19 | 辽宁工程技术大学 | A kind of building method of novel matrix formula multiple degrees of freedom coupling inductance |
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