CN109903960A - Choke coil with current sensor - Google Patents
Choke coil with current sensor Download PDFInfo
- Publication number
- CN109903960A CN109903960A CN201811176729.9A CN201811176729A CN109903960A CN 109903960 A CN109903960 A CN 109903960A CN 201811176729 A CN201811176729 A CN 201811176729A CN 109903960 A CN109903960 A CN 109903960A
- Authority
- CN
- China
- Prior art keywords
- core
- soft magnetism
- choke coil
- current sensor
- protruding portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 230000005389 magnetism Effects 0.000 claims abstract description 58
- 239000004020 conductor Substances 0.000 claims abstract description 31
- 230000005291 magnetic effect Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/207—Constructional details independent of the type of device used
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
-
- 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
-
- 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
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
Abstract
The present invention relates to a kind of choke coil (12) with current sensor, especially common mode choke (1), its core (10) with hollow soft magnetism, the core has multiple for guiding the recess portion of electric conductor (22 to 24) respectively, wherein, protruding portion (121 to 123) that each recess portion is extended through the center (M) of the excircle of the core (10) from hollow soft magnetism towards the core (10) of hollow soft magnetism and adjacent recess portion every, and wherein, it is disposed with current sensor (31 to 33) between two adjacent protruding portions (121 to 123) and adjacent to the end regions of these protruding portions (121 to 123).
Description
Technical field
The present invention relates to a kind of choke coil with current sensor, especially a kind of common mode choke.
Background technique
EMV filter (Electro Magnetic Compatibility) it is used for vehicle
In power electronic device in, to ensure as far as possible not interfere onboard power system.EMV filter is not only used in power
On the side DC (DC=Gleichstrom, direct current) of electronic device and the side AC (AC=Wechselstrom, exchange) can be used in
On.In the case where the inverter for the AC electric energy being converted to the DC electric energy of battery on motor, EMV filter for example is mounted at
Between inverter and motor, to reduce the propagation towards the electromagnetic interference in the direction of motor.
The principle of output end filter can be described in the form of electrical choke.Choke coil has the core of soft magnetism, and
And usually tool is there are three the AC route (electric conductor) that guides inside the core of soft magnetism, they by the core of soft magnetism with
Motor connection.Common code impedance is generated using this structure, to reduce the propagation of common mode interference.It is used in inverter simultaneously
AC current sensor, to measure AC electric current.Then the signal of these current sensors is directed in microcontroller and at that
In be further processed to be adjusted or monitor.
The typical current sensor according to open loop hall principle is shown in FIG. 1, and by 30 He of Hall sensor
The core 10 and AC route 21 of soft magnetism are constituted, and AC route 21 is guided through the core 10 of soft magnetism.By flowing through soft magnetism
The electric current of the core 10 of property, can generate the electromagnetic field of restriction in the region of Hall sensor 30.
So far, the EMV filter on the AC output end of inverter and AC current sensor are in inverter by that
This is individually designed and manufactured.This causes two components that must have big structure space.Due to having used the material of soft magnetism,
So that the two components are expensive.
Summary of the invention
Therefore, the task of the present invention is a kind of choke coil for EMV filter is provided, lesser structure space is needed
It and is therefore cheap.
According to the present invention, which is solved by the feature of independent claims.Advantageous embodiment is appurtenance
The theme that benefit requires.
Therefore, it is proposed to a kind of choke coil, the core with hollow soft magnetism.The core has multiple for distinguishing
Guide the recess portion of electric conductor.Each recess portion is by the excircle of the core from hollow soft magnetism towards the core of hollow soft magnetism
The protruding portion that the direction at the center of body extends is separated with adjacent recess portion.Therefore, between two adjacent recess portions there are
This protruding portion.Therefore, there are this recess portions between two adjacent protruding portions.Core of these protruding portions towards soft magnetism
The direction (that is, radially inward direction) at the center of body possesses end regions respectively.In at least two so adjacent protrusions
Current sensor is disposed between portion and adjacent to these end regions of the two protruding portions.
It may be implemented to reduce the structure for arranging current sensor in EMV filter by the arrangement proposed
Space.Therefore, the function of choke coil and current sensor is incorporated in common component.
In particular, electric conductor and current sensor and the core of soft magnetism are all jointly the component parts of choke coil.This
Outside, choke coil may also include the shell for surrounding core.
Preferably, core possesses precisely or at least three this recess portions.Therefore, it is provided with precisely or at least three
A this electric conductor.Therefore, in particular, choke coil can be used in three-phase or the inverter of multiphase.Here, electric conductor then shape
At the phase line (AC route) of inverter.Then, institute can be known by using three or more this current sensors
There is the phase current of phase line.
Preferably, it is respectively disposed with current sensor in this way between all two adjacent protruding portions.Therefore,
It can be set precisely or at least three current sensors.In particular, current sensor is for knowing following electric conductor
In electric current, the electric conductor between with current sensor two adjacent protrusions between recess portion in is guided.
Preferably, one or more current sensors are relative to affiliated electric conductor court guided in respective recess portion
The direction at the center of the core of soft magnetism be staggered.Therefore, one or more current sensors relative to electric conductor radially
More it is located inside core.In particular, when using multiple current sensors, these current sensors are arranged in the core of soft magnetism
On internal common radius.In particular, it is arranged on the common radius of (others) of the electric conductor inside the core of soft magnetism
Or it is guided.
Protruding portion can be respectively provided with the shape of pin.Protruding portion can be from the radial direction of the cavity of the core of hollow soft magnetism
External region extends to the region of the inner radial of the cavity.Then, recess portion is also equipped in cavity inside.Therefore, these
Recess portion is respectively formed a part of cavity.Protruding portion is especially constructed with the core of soft magnetism one-piece.Then, these protruding portions
Therefore it forms the part of hollow core being integrated together and is made of the material of same soft magnetism.
Choke coil is preferably electrical choke, especially common mode choke.This (common mode) choke coil can be for example used for
It is arranged in the case where power electronic device in the high voltage input terminal of power electronics devices, such as the situation in inverter
Under be arranged between DC high pressure plug device (DC=direct current) and intermediate circuit capacitor.As an alternative, as described above, choke coil can also
To be arranged on the AC output end of inverter, that is, it is arranged on the phase line (AC route) of inverter.Therefore, the invention further relates to
This inverter.
This electric conductor for example can be structured as conductor rail, metal wire or twisted wire.Electric conductor is especially well led by having
Electrical material, such as such as copper or aluminium are constituted.
The core of this soft magnetism is made of the material of soft magnetism.This especially should be understood to be readily able to the magnetic in magnetic field
The ferromagnetic material changed.According to DIN EN 60404-1, this material especially be can be with rectifying less than or equal to 1000A/m
The raw material of stupid power.
In embodiments, protruding portion is arranged with being equably staggered on the circumferencial direction of the core of soft magnetism.When excellent
Select in embodiment setting just there are three recess portion and therefore just setting there are three when protruding portion, then these protruding portions with
Arrange with offseting one from another to 120 degree of angle.By the arrangement, so that electric conductor and current sensor are (if using multiple
Words) distance having the same each other, and simplify due to uniformity the manufacture of choke coil.
In embodiments, protruding portion towards soft magnetism core center direction with pointed convergence end region
Domain.Advantageously, here, current sensor, preferably each current sensor are all disposed within the pointed of two adjacent protruding portions
In the region of the rake of the end regions of convergence.In particular, a current sensor or multiple current sensors are then arranged
In the immediate vicinity of the core of soft magnetism.
In embodiments, the core (at least in outside) of hollow soft magnetism has the shape of cylinder.Protruding portion as a result,
End regions be directed toward center be exactly cylinder radius midpoint.Further, since symmetrical shape and simplify manufacture.
In embodiments, each protruding portion towards soft magnetism core center direction extension (length) it is small
The distance between the excircle of cavity inside core and the center of core of soft magnetism.Which ensure that protruding portion is not or not center
It contacts and does not therefore influence electric field.
In embodiments, each protruding portion at least or just has as follows on the longitudinal direction of the core of soft magnetism
Length, these length correspond to length of the current sensor on the longitudinal direction of the core of soft magnetism.In other words, in core
Longitudinal direction on, protruding portion and one or more current sensors are at least isometric.Therefore, material can be saved.
In a further embodiment, at least one protruding portion, preferably each protruding portion, soft magnetism core
There is length in whole length on its longitudinal direction.Differential mode can be further reduced due to improving differential-mode impedance as a result,
Interference.
In embodiments, current sensor configuration is Hall sensor.Hall sensor to (nonmagnetic) dirt and
Water is insensitive, so that it is highly suitable for automotive field.
Current sensor can be placed on common circuit board.The circuit board can be a part of choke coil.It is right
It is required electronic component for the signal processing of current sensor, such as capacitor and resistor can also be placed on this
On common circuit board.
Other features and advantages of the present invention by the attached drawing for showing details by the embodiment of the present invention below
It describes and is obtained by claim.Each feature can be respectively individually or multiple in any combination in implementation of the invention
It is realized in variant schemes.
Detailed description of the invention
The preferred embodiment of the present invention is elaborated by attached drawing below.Wherein:
Fig. 1 shows the core of the soft magnetism according to prior art with Hall sensor and AC route；
Fig. 2 shows the views of the choke coil according to embodiments of the present invention with the current sensor being integrated together
Figure；
Fig. 3 shows the cross section of choke coil shown in Fig. 2.
In the following drawings description, identical element or function part appended drawing reference having the same.
Specific embodiment
Core of the invention is the structure space reduced for arranging current sensor in EMV filter and therefore drops
Low cost.
Fig. 2 shows feasible embodiments of the invention.Here, the present invention is by being embodied as the common mode choke of cylinder
12 example illustrates that common mode choke has the core 10 of soft magnetism and in three electric conductors 22,23,24 wherein guided.
Electric conductor 22,23,24 is AC route respectively, namely for each electric line of induced AC electric current.Purpose is to generate use
In the common code impedance of decaying interference and for magnetic field needed for current sensor 31,32,33.
Fig. 3 is shown in the cross section of choke coil 12 shown in Fig. 2.
Each of three electric conductors 22,23,24 are directed across common mode chokes in the recess portion for oneself being its setting
The core 10 of the soft magnetism shaped to the shape of cylinder in this example of circle 12.These recess portions have been collectively form the core 10 of soft magnetism
Internal cavity.That is, inside (hollow) region of common mode choke 12 is by ground structure as follows, that is, make it
There are three for guiding the recess portion of one of electric conductor 22,23,24 just respectively for tool.
Here, wherein each recess portion passes through two protruding portions 121,122,123 and separates with two adjacent recess portions.This
It is meant that one of protruding portion 121,122,123 is between two adjacent recess portions.And it means that in two phases
There are one of recess portions between adjacent protruding portion 121,122,123.It therefore, is protruding portion there are three three recess portions are arranged just
121、122、123。
The direction (i.e. radially inwardly) of protruding portion 121,122,123 towards the midpoint M of cylinder radius have length or prolong
Exhibition portion A.That is, independently with the outer shape of the core 10 of soft magnetism, wherein each protruding portion 121,122,123 from
The excircle of cavity towards core 10 center M extend to inside hollow core 10.When the core 10 of soft magnetism is embodied as
When cylinder, which is also referred to as midpoint M.
As shown, protruding portion 121,122,123 is preferably with 120 degree of angle along the circumferencial direction of core 10
It arranges with offseting one from another.Due to well-balanced property, this facilitates the production of choke coil 12.
Protruding portion 121,122,123 advantageously has pointed convergence towards the direction of the midpoint M of the core of soft magnetism 10
End regions.Therefore as being clearly seen in Fig. 2 and 3, protruding portion 121,122,123 has arrow-shaped in cross-section respectively
Shape.
Hall sensor is preferably for current sensor 31,32,33 necessary to current measurement.Current sensor 31,
32, it 33 is attached respectively to one of electric conductor 22,23,24.For this purpose, wherein each current sensor 31,32,33 is all located at
In the region of the recess portion for having affiliated electric conductor 22,23,24 of the cavity inside of core 10.Therefore, current sensor 31,32,
33 be equally arranged in belonging to the recess portion for having affiliated electric conductor 22,23,24 in, that is to say, that be respectively arranged wherein two
Between a protruding portion 121,122,123.As Fig. 3 is high-visible, current sensor 31,32,33 is preferably placed in recess portion
In the region of the rake of the end of pointed convergence and therefore close to the midpoint M of cylinder.
The shape and size of recess portion select as follows, that is, exist be sufficiently used for 22,23,24 and of electric conductor wherein
The space of affiliated current sensor 31,32,33, and current sensor 31,32,33 can be measured in an appropriate manner and led
Electric current in body 22,23,24.
As can see in Fig. 3, due to the common mode current of three electric conductors 22,23,24, so that along soft magnetism
The circumference of core 10 and magnetic field is produced in the circumferential inner of the core of soft magnetism 10.This is in Fig. 3 by surrounding center M shape
Two dotted lines of concentric circle are shown.Thereby produce common code impedance.
The electric current flowed in electric conductor 22,23,24 also produces magnetic field respectively, however, the magnetic field substantially only through
Two adjacent protruding portions 121,122,123 of respective conductor 22,23,24 conduct.This is in Fig. 3 by around conductor 22
Chain-dotted line is exemplarily illustrated.The magnetic field passes through the conduction of protruding portion 121 and 122 and in this example by affiliated current sense
Device 31 detects.Current sensor 31 is that (unshowned) microcontroller generates corresponding signal.
As can also see in Fig. 3, it is arranged for recess portion and then electric conductor 22,23,24 and electric current
The protruding portion 121,122,123 that sensor 31,32,33 separates is not contacted in the center M of the core of soft magnetism.Therefore, it
End regions there is a certain distance (air gap) each other.It is disposed with current sensor 31,32,33 wherein.
Shape, the length/prolong of protruding portion 121,122,123 on the direction towards the midpoint M of the core 10 of soft magnetism
Exhibition portion A, along soft magnetism core 10 longitudinal direction L protruding portion 121,122,123 length and circumferentially
The width of protruding portion 121,122,123 selected as follows, that is, so that magnetic field is passed through electric conductor 22,23,24 and affiliated
31,32,33 ground of current sensor is generated and is guided with method in set manner.
Protruding portion 121,122,123 in the core 10 of soft magnetism can design as follows, that is, exist only in Hall
In the region of sensor 31,32,33, that is to say, that do not deposited along the whole length L of the core 10 of the soft magnetism of choke coil 12
?.In this embodiment, material can be saved and therefore save cost.
As an alternative, protruding portion 121,122,123 can be along the whole length L structure of the core 10 of the soft magnetism of choke coil 12
It makes.In this embodiment it is possible to be additionally further reduced DM EMI, this is because can use protruding portion 121,122,
123 generate differential-mode impedance.
The common mode choke 12 proposed can be particularly used for the inverter of automotive field (namely for motor vehicle)
In EMV filter.But it is not limited to this application.
Reference signs list
The core of 10 soft magnetisms
12 choke coils
22 to 24 electric conductors
31 to 33 current sensors
121 to 123 protruding portions
Extension/length of A protruding portion
Length/longitudinal direction of L choke coil
The midpoint M
Claims (9)
1. a kind of choke coil (12), especially common mode choke (1), the core (10) with hollow soft magnetism,
The core has multiple recess portions for guidance electric conductor (22 to 24) respectively,
Wherein, each recess portion is by the excircle of the core (10) from hollow soft magnetism towards the core of hollow soft magnetism
(10) protruding portion (121 to 123) that the direction at center (M) extends is separated with adjacent recess portion, and
Wherein, between two adjacent protruding portions (121 to 123) and adjacent to the end of the two protruding portions (121 to 123)
It is disposed with current sensor (31 to 33) to portion region.
2. choke coil (12) according to claim 1, wherein core of the protruding portion (121 to 123) in soft magnetism
(10) it arranges with equably offseting one from another on circumferencial direction.
3. choke coil (12) according to any one of the preceding claims, wherein the protruding portion (121 to 123) towards
The direction at the center of the core (10) of soft magnetism has the end regions assembled pointedly.
4. choke coil (12) according to claim 3, wherein current sensor (31 to 33) is arranged in two protruding portions
In the region of the rake of the end regions of the pointed convergence of (121 to 123).
5. choke coil (12) according to any one of the preceding claims, wherein the core (10) of hollow soft magnetism has
There is the shape of cylinder.
6. choke coil (12) according to any one of the preceding claims, wherein each protruding portion (121 to 123) towards
The extension in the direction at the center of the core (10) of soft magnetism
(A) the distance between excircle and center (M) of the cavity of core (10) inside of hollow soft magnetism are both less than.
7. choke coil (12) according to any one of the preceding claims, wherein each protruding portion (121 to 123) is soft
There is the following length, the length exists corresponding to current sensor (31 to 33) on the longitudinal direction (L) of magnetic core (10)
Length on the longitudinal direction (L) of the core (10) of soft magnetism.
8. choke coil (12) according to any one of the preceding claims, wherein at least one protruding portion (121 to 123)
There is length in the whole length on its longitudinal direction (L) of the core (10) of soft magnetism.
9. choke coil (12) according to any one of the preceding claims, wherein current sensor (31 to the 33) structure
It makes as Hall sensor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017222248.4 | 2017-12-08 | ||
| DE102017222248.4A DE102017222248A1 (en) | 2017-12-08 | 2017-12-08 | Throttle with current sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109903960A true CN109903960A (en) | 2019-06-18 |
| CN109903960B CN109903960B (en) | 2024-04-16 |
Family
ID=66629211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811176729.9A Active CN109903960B (en) | 2017-12-08 | 2018-10-10 | Choke with current sensor |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109903960B (en) |
| DE (1) | DE102017222248A1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6377479B1 (en) * | 1999-09-14 | 2002-04-23 | Hitachi, Ltd. | Power conversion system |
| CN1577882A (en) * | 2003-07-16 | 2005-02-09 | 马维尔国际贸易有限公司 | Power inductor with reduced DC current saturation |
| US20070247135A1 (en) * | 2006-04-21 | 2007-10-25 | Toko Kabushiki Kaisha A Corporation Of Japan | Current detection device |
| CN101552100A (en) * | 2007-11-30 | 2009-10-07 | 西门子公司 | Electric component, especially a transformer or a choke |
| CN102368422A (en) * | 2011-09-16 | 2012-03-07 | 陆明岳 | Magnetic core used for differential-mode choking coil |
| CN202523503U (en) * | 2012-01-17 | 2012-11-07 | 上海追日电气有限公司 | High-frequency filter inductor |
| CN202917282U (en) * | 2012-10-16 | 2013-05-01 | 洛阳泰阳电器有限公司 | Choking coil |
-
2017
- 2017-12-08 DE DE102017222248.4A patent/DE102017222248A1/en active Pending
-
2018
- 2018-10-10 CN CN201811176729.9A patent/CN109903960B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6377479B1 (en) * | 1999-09-14 | 2002-04-23 | Hitachi, Ltd. | Power conversion system |
| CN1577882A (en) * | 2003-07-16 | 2005-02-09 | 马维尔国际贸易有限公司 | Power inductor with reduced DC current saturation |
| US20070247135A1 (en) * | 2006-04-21 | 2007-10-25 | Toko Kabushiki Kaisha A Corporation Of Japan | Current detection device |
| CN101552100A (en) * | 2007-11-30 | 2009-10-07 | 西门子公司 | Electric component, especially a transformer or a choke |
| CN102368422A (en) * | 2011-09-16 | 2012-03-07 | 陆明岳 | Magnetic core used for differential-mode choking coil |
| CN202523503U (en) * | 2012-01-17 | 2012-11-07 | 上海追日电气有限公司 | High-frequency filter inductor |
| CN202917282U (en) * | 2012-10-16 | 2013-05-01 | 洛阳泰阳电器有限公司 | Choking coil |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102017222248A1 (en) | 2019-06-13 |
| CN109903960B (en) | 2024-04-16 |
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