WO2024105061A1 - Dispositif à noyau magnétique - Google Patents

Dispositif à noyau magnétique Download PDF

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Publication number
WO2024105061A1
WO2024105061A1 PCT/EP2023/081805 EP2023081805W WO2024105061A1 WO 2024105061 A1 WO2024105061 A1 WO 2024105061A1 EP 2023081805 W EP2023081805 W EP 2023081805W WO 2024105061 A1 WO2024105061 A1 WO 2024105061A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic core
core device
holding element
central
annular magnetic
Prior art date
Application number
PCT/EP2023/081805
Other languages
English (en)
Inventor
Guido RASEK
Madhavi Dhara
Arnoud Smit
Oscar Perez Cornejo
Original Assignee
Valeo Eautomotive Germany Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valeo Eautomotive Germany Gmbh filed Critical Valeo Eautomotive Germany Gmbh
Publication of WO2024105061A1 publication Critical patent/WO2024105061A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • 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
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F2017/0093—Common mode choke coil
    • 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
    • H01F2017/065—Core mounted around conductor to absorb noise, e.g. EMI filter
    • 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
    • H01F2017/067—Core with two or more holes to lead through conductor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections

Definitions

  • the present invention concerns a magnetic core device for electromagnetic filtering purposes, especially configured to surround electrical conductors forming busbars adapted to deliver electrical power.
  • an electric or a hybrid automotive vehicle presents an electric drive comprising an electric motor and other electrical equipment, such as power converters, which need to be supplied either by a high voltage power supply, or by a low voltage power supply.
  • power converters are configured to convert an input voltage into an output voltage.
  • an inverter converts a direct current (DC) voltage from a high-voltage power supply battery to an alternating current (AC) electrical power to feed the electric motor to drive the vehicle.
  • an on-board charger converts an AC voltage from an external electrical network into a DC voltage to charge the high-voltage power supply battery.
  • such power converters present a plurality of electrical components, such as electrical conductors forming busbars, causing electromagnetic interference (EMI) that may disturb the proper operation of the power converter or to devices connected to the DC busbar, especially in a high-power environment.
  • EMI electromagnetic interference
  • EM electromagnetic
  • a magnetic core notably made of a ferromagnetic material, surrounding at least partially the busbars.
  • a positive DC busbar and a negative DC busbar connected on one side respectively to a positive pole and to a negative pole of the high-voltage power supply battery, and on another side to a power stage of the inverter.
  • an annular core surrounding the positive and the negative DC busbars for EMI filtering.
  • the main objective of the present invention is to provide a magnetic core device for electromagnetic filtering that is easier to size and to manufacture and potentially provides a higher flexibility in the design.
  • the present invention concerns a magnetic core device comprising two complementary cores configured to come against one another along a contact surface, such that the two complementary cores form together an annular magnetic core having an inner volume.
  • the magnetic core device further comprises a central element disposed in the inner volume of the annular magnetic core such that to separate the inner volume into two respective free volumes between the central element and the annular magnetic core, the two free volumes each being adapted to be passed through by one of two electrical conductors.
  • the two complementary cores and the central element are separate pieces.
  • the central element further comprises a central magnetic core and a holding element housing the central magnetic core, the holding element being configured to ensure the positioning of the central element with respect to the annular magnetic core.
  • the magnetic core device allows thus advantageously to filter both common mode and differential mode interferences. More precisely, the common mode interferences are mostly attenuated by the annular magnetic core surrounding the two electrical conductors, and the differential mode interferences are mostly attenuated thanks to the combination of the annular magnetic core and the central element.
  • the invention provides thus an improved EMI filtering efficiency and compacity of the inverter.
  • the separation between the annular magnetic core and the central element provides the substantial gain of allowing to size the filtering of common mode interferences independently from the filtering of differential mode interferences.
  • the central element allows to easily adapt the length of an airgap between the central magnetic core and the annular magnetic core, notably by varying the thickness of the holding element.
  • the invention makes it possible to use a different material for the central magnetic core and for the annular magnetic core depending on the required EMI filtering performance.
  • the invention eases the adaptation of the length of the airgap and of the material of the central magnetic core, to achieve the required saturation and impedance of the magnetic core device.
  • the holding element allows the central element to be advantageously positioned in a stable and secured manner even in presence of vibrations during in-service life of the inverter.
  • the configuration of the magnetic core device comprising three different pieces allows to ease considerably the mounting of the magnetic core device and the two electrical conductors together and the mounting of the magnetic core device within an electrical equipment such as an inverter.
  • the magnetic core device according to the invention forms a standard and scalable pre-assembly which eases the manufacturing process, reduces the associated manufacturing costs, and improves the compacity of the inverter.
  • the contact surface forms a substantially plane surface located between the two free volumes.
  • the contact surface forms a substantially plane surface transversally crossing both of the two free volumes.
  • the present invention makes it possible to adapt the contact surface such that to ease the mechatronic integration of the magnetic core device within the inverter depending on the configurations of the different elements of the inverter, and in particular the configurations of a housing and of a cooling system of the inverter.
  • the annular magnetic core comprises at least one longitudinal recess configured to receive a portion of the holding element. Then, the mounting of the magnetic core device is simplified while ensuring a stable positioning of the central element with respect to the annular magnetic core.
  • the annular magnetic core comprises longitudinal protruding portions configured to be accommodated in longitudinal slots of the holding element.
  • the mounting of the magnetic core device is simplified while ensuring a stable positioning of the central element with respect to the annular magnetic core.
  • such a configuration provides the advantage of increasing the contact surface between the two complementary cores which in return improves the common mode filtering efficiency of the magnetic core device.
  • the holding element comprises at least one frontal blocking element on at least an end of the holding element, the annular magnetic core being configured to accommodate the at least one frontal blocking element.
  • the use of frontal blocking elements housed by the frontal recesses of the annular magnetic core allows to prevent misalignment between the central element and the annular magnetic core in two lateral directions and in the longitudinal direction of the annular magnetic core.
  • the use of the frontal blocking elements provides the advantage of increasing the contact surface between the two complementary cores which in return improves the common mode filtering efficiency of the magnetic core device.
  • the holding element is made out of a diamagnetic material, for instance a plastic material, especially a high-performance plastic material.
  • the present invention also concerns a busbar assembly comprising the two electrical conductors and the magnetic core device as described previously, the two electrical conductors being configured to pass respectively through the two free volumes of the magnetic core device.
  • the present invention also concerns an inverter configured to convert a direct current (DC) voltage coming from a high-voltage power supply battery into an alternating current (AC) voltage so as to drive an electric motor of an electric drive of an electric vehicle or of a hybrid electric vehicle.
  • the AC voltage may be a multiphase AC voltage, especially a three-phase voltage.
  • the inverter further comprises the busbar assembly as previously described.
  • the inverter comprises a power stage, an intermediate circuit capacitor, and a housing, the housing being configured to accommodate the busbar assembly, the power stage, and the intermediate circuit capacitor.
  • Another aspect of the invention is the electric drive, comprising the electric motor and the inverter as described above configured to convert a DC voltage into an AC voltage to drive the electric motor.
  • a further aspect of the invention is a vehicle, comprising the electric drive for driving the vehicle.
  • the vehicle may comprise the high-voltage power supply battery, preferably a rechargeable battery for providing the DC voltage to the inverter, if applicable.
  • Figure 1 illustrates a view of a first example of a magnetic core device according to an embodiment of the invention
  • Figure 2 illustrates a view of a second example of the magnetic core device according to an embodiment of the invention
  • Figure 3 illustrates a view of a third example of the magnetic core device according to an embodiment of the invention.
  • Figure 4 illustrates a view of a fourth example of the magnetic core device according to an embodiment of the invention.
  • Figure 5 illustrates a view of a fifth example of the magnetic core device according to an embodiment of the invention.
  • Figure 6A and 6B illustrate two cut views of a busbar assembly comprising the fifth example of the magnetic core device according to the invention
  • Figure 7 illustrates a schematic automotive electric or hybrid vehicle comprising an inverter comprising the magnetic core device according to the invention.
  • the electric drive comprises an electric motor M and electrical equipment such as power converters, notably an inverter I being configured to convert a direct current (DC) voltage coming from a high-voltage power supply battery B into an alternating current (AC) voltage in order to drive the electric motor M.
  • the AC voltage may be a multiphase AC voltage, such as a three-phase voltage.
  • the inverter I comprises a power stage PW, an electromagnetic interference (EMI) filtering stage F, and an intermediate circuit capacitor C commonly designated as DC-link capacitor.
  • the power stage PW generally comprises several pairs of switching elements arranged in half-bridges within so-called power modules, controlled such that to deliver an AC voltage for driving the electric motor M.
  • the EMI filtering stage F usually comprises capacitive elements, such as X capacitors and/or Y capacitors, and inductive elements, such as chokes, for filtering potential electromagnetic emissions.
  • the inverter I further comprises two electrical conductors 11 forming DC busbars configured to connect respectively a positive pole and a negative pole of the high-voltage power supply battery B to the power stage PW of the inverter I.
  • the two electrical conductors 11 advantageously present a rectangular section, although other section shapes are also possible.
  • the electrical conductors are generally made out of a metallic material, most commonly copper.
  • the present invention concerns a magnetic core device notably configured to surround at least partially the two electrical conductors 11 , and forming with the two electrical conductors 11 a busbar assembly.
  • the inverter I further comprises a housing 120 configured to accommodate the busbar assembly, the power stage PW, the intermediate circuit capacitor C, and possibly a cooling system.
  • FIGs 1 to 5 illustrate several examples of the magnetic core device 1 according to the invention.
  • the magnetic core device 1 comprises two complementary cores 2a, 2b configured to come against one another along a contact surface 21 , such that the two complementary cores 2a, 2b form together an annular magnetic core 2 having an inner volume 22.
  • the two complementary cores 2a, 2b may advantageously be substantially symmetrical with respect to one another, forming thus two “half” cores of the annular magnetic core.
  • the two “half” cores 2a, 2b present substantially a U-shape.
  • Such “half” cores simplify the standardization of components and thus permit to reduce manufacturing costs.
  • the two complementary cores 2a, 2b are notably made of a ferromagnetic material, such as ferrites, iron powders, nanocrystalline material, or iron alloys.
  • the magnetic core device further comprises a central element 3 disposed in the inner volume 22 of the annular magnetic core 2 such that to separate the inner volume 22 into two free volumes 22a, 22b between two opposite faces 33a, 33b of the central element 3 and the annular magnetic core 2. Then, the two free volumes 22a, 22b are each adapted to be passed through by one of the two electrical conductors 11 .
  • the magnetic core device allows thus advantageously to filter both common mode and differential mode interferences such as the solution proposed in DE102017109499A1 . More precisely, the common mode interferences are mostly attenuated by the annular magnetic core surrounding the two electrical conductors, and the differential mode interferences are mostly attenuated thanks to the combination of the annular magnetic core and of the central element.
  • the invention provides thus an improved EMI filtering efficiency and compacity of the inverter.
  • the central element 3 comprises a central magnetic core 31 and a holding element 32 housing the central magnetic core 31 .
  • the holding element 32 is configured to ensure the positioning of the central element 3 with respect to the annular magnetic core 2.
  • the holding element allows the central element 3 to be advantageously positioned in a stable and secured manner even in presence of vibrations during in-service life of the inverter.
  • the separation between the annular magnetic core and the central element provides the substantial gain of allowing to size the filtering of common mode interferences independently from the filtering of differential mode interferences.
  • the invention makes it possible to use a different material for the central magnetic core and for the annular magnetic core depending on the required EMI filtering performance.
  • the central magnetic core 31 may be made of a ferromagnetic material, such as ferrites, iron powders, or iron alloys.
  • the holding element 32 is advantageously made out of a diamagnetic or a nonmagnetic material, notably a polyethylene or a plastic material, especially a high-performance plastic material able to resist to high temperature conditions.
  • the central element 3 allows to easily adapt the length of an airgap between the central magnetic core 31 and the annular magnetic core 2, notably by varying the thickness of the holding element 32.
  • the airgap length is defined by the sum of the distances D1 and D2.
  • D1 is equal to D2.
  • the decisive parameter is not the repartition of the airgap length between D1 and D2 but the value of their sum.
  • the magnetic core device according to the invention presents the substantial advantage of allowing to achieve the required saturation and impedance of the magnetic core device for differential mode interference filtering, independently from common mode interference filtering, by easing the adaptation of the length of the airgap and of the materials of the central magnetic core and of the annular magnetic core.
  • the two complementary cores 2a, 2b and the central element 3 are separate pieces.
  • the configuration of the magnetic core device comprising three different pieces allows to ease considerably the mounting of the magnetic core device and the two electrical conductors together and the mounting of the magnetic core device within an electrical equipment such as the inverter.
  • the magnetic core device forms a standard and scalable pre-assembly which eases the manufacturing process, reduces the associated manufacturing costs, and improves the compacity of the inverter.
  • the central magnetic core 31 may for instance present an elongated shape with a rectangular section.
  • the contact surface 21 may form a substantially plane surface located between the two free volumes 22a, 22b.
  • the contact surface 21 forms a substantially plane surface transversally crossing both of the two free volumes 22a, 22b.
  • the present invention makes it possible to adapt the contact surface 21 such that to ease the mechatronic integration of the magnetic core device within the inverter depending on the configurations of the different elements of the inverter, and in particular the configurations of the housing and of the cooling system of the inverter.
  • the contact surface may be advantageously oriented parallel to a parting plane of the housing.
  • each of the two complementary cores may be cooled separately, for example using a cooling module associated to each one of the two complementary cores. In that case, the separation between the cooling modules is substantially parallel to the contact surface.
  • the three pieces configuration of the invention provides more latitude regarding the mounting possibilities of the magnetic core device within the inverter, and especially for the mounting of the two electrical conductors passing through the magnetic core device.
  • the two complementary cores may be assembled together on the contact surface through a mechanical bond or by glue.
  • the principle is to have complementary portions to be assembled together between the annular magnetic core and the central element, while easing the manufacturing of the magnetic core device and ensuring a stable holding and positioning between the annular magnetic core and the central element.
  • the annular magnetic core may comprise at least one longitudinal recess configured to receive a portion of the holding element.
  • the at least one longitudinal recess is oriented in a longitudinal direction of the annular magnetic core.
  • the longitudinal direction of the annular magnetic core notably corresponds to a direction of insertion of the two electrical conductors through the two free volumes.
  • the central element may be slid along the longitudinal direction of the annular magnetic core even at the end of the assembling process.
  • Figures 1 and 2 illustrate respectively a first and a second examples of the magnetic core device 1 according to such an embodiment of the invention.
  • the annular magnetic core 2 comprises two longitudinal recesses 23, notably oriented towards one another, and configured to each receive a portion of the holding element 32.
  • the holding element 32 has notably a rectangular section.
  • two side portions 321 of the holding element, located respectively on two opposite external faces of the holding element, are configured to be accommodated in the two longitudinal recesses 23 of the annular magnetic core 2.
  • the first and second examples present the advantage of being easy to manufacture, the shapes of the two longitudinal recesses 23 of the annular magnetic core 2 and of the central element 3 being simple.
  • the contact surface 21 between the two complementary cores is reduced due to the two longitudinal recesses 23 which has an impact on the common mode filtering efficiency.
  • Figure 3 illustrates a third example of the magnetic core device 1 .
  • the at least one longitudinal recess forms longitudinal grooves 24 configured to receive corresponding portions of the holding element 32, said portions forming longitudinal ribs 322.
  • the holding element 32 may have four longitudinal ribs 322, each being located at a different corner of the holding element 32.
  • the annular magnetic core 2 may have four longitudinal grooves 24, each corresponding to one of the four longitudinal ribs 322 of the holding element 32.
  • the annular magnetic core 2 may comprise longitudinal protruding portions 25. Then, the longitudinal protruding portions 25 are configured to be accommodated in longitudinal slots 323 of the holding element 32.
  • This fourth example of the invention presents the advantage of increasing the contact surface between the two complementary cores which in return improves the common mode filtering efficiency of the magnetic core device.
  • the central element may be slid along the longitudinal direction of the annular magnetic core even at the end of the assembling process.
  • the magnetic core device and more specifically the holding element present a same section along a longitudinal direction of the magnetic core device.
  • the central element may be slid into its position even after the assembly of the annular magnetic core.
  • the holding element 32 may comprise at least one frontal blocking element 324 on at least an end of the holding element 32, the annular magnetic core 2 being configured to accommodate the at least one frontal blocking element 324.
  • the annular magnetic core 2 may further comprise frontal recesses 26, for instance having a depth comprised between 0.5mm and 3mm, the frontal recesses 26 being configured to accommodate the frontal blocking elements 324.
  • frontal blocking elements housed by the frontal recesses of the annular magnetic core allows to prevent misalignment between the central element 3 and the annular magnetic core 2 in two lateral directions and in the longitudinal direction of the annular magnetic core 2.
  • the use of the frontal blocking elements provides the advantage of increasing the contact surface between the two complementary cores which in return improves the common mode filtering efficiency of the magnetic core device.
  • the magnetic core device 1 may further comprise a fixation system configured to attach the magnetic core device to the housing 120 of the inverter.
  • a fixation system configured to attach the magnetic core device to the housing 120 of the inverter.
  • busbar assembly 10 comprising the two electrical conductors 11 and the magnetic core device 1 , the two electrical conductors 1 1 being configured to pass respectively through the two free volumes 22a, 22b of the magnetic core device 1 .
  • the inverter I configured to convert a direct current (DC) voltage coming from the high-voltage power supply battery B into an alternating current (AC) voltage so as to drive the electric motor of the electric drive of the electric vehicle or of the hybrid electric vehicle.
  • the inverter I comprises the busbar assembly 10 according to the preceding aspect of the invention.
  • the inverter I further comprises the power stage PW, the intermediate circuit capacitor C, and the housing 120, the housing 120 being configured to accommodate the busbar assembly 10, the power stage PW, and the intermediate circuit capacitor C.
  • the electric drive comprising the electric motor and the inverter as described above configured to convert a DC voltage into an AC voltage to drive the electric motor.
  • a further aspect of the invention is the vehicle, comprising the electric drive for driving the vehicle.
  • the vehicle may comprise the high-voltage power supply battery, preferably a rechargeable battery for providing the DC voltage to the inverter, if applicable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

L'invention concerne un dispositif à noyau magnétique (1) comprenant deux noyaux complémentaires (2a, 2b) conçus pour venir les uns contre les autre le long d'une surface de contact (21), de telle sorte que les deux noyaux complémentaires (2a, 2b) forment ensemble un noyau magnétique annulaire (2) ayant un volume interne (22) ; un élément central (3) disposé dans le volume interne (22) du noyau magnétique annulaire (2) de telle sorte à séparer le volume interne (22) en deux volumes libres respectifs (22a, 22b) dont chacun est conçu pour être traversé par l'un de deux conducteurs électriques. Les deux noyaux complémentaires (2a, 2b) et l'élément central (3) sont des pièces séparées. L'élément central (3) comprend un noyau magnétique central (31) et un élément de maintien (32) logeant le noyau magnétique central (31), l'élément de maintien (32) étant conçu pour assurer le positionnement de l'élément central (3) par rapport au noyau magnétique annulaire (2).
PCT/EP2023/081805 2022-11-15 2023-11-14 Dispositif à noyau magnétique WO2024105061A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022130155.9 2022-11-15
DE102022130155.9A DE102022130155A1 (de) 2022-11-15 2022-11-15 Magnetkernvorrichtung

Publications (1)

Publication Number Publication Date
WO2024105061A1 true WO2024105061A1 (fr) 2024-05-23

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WO (1) WO2024105061A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080303624A1 (en) * 2007-06-08 2008-12-11 Nec Tokin Corporation Inductor
US20090051478A1 (en) * 2007-08-20 2009-02-26 Cheng-Hong Lee Filter and manufacturing method thereof
US20100289607A1 (en) * 2009-05-15 2010-11-18 Delta Electronics, Inc. Transformer structure
DE102017109499A1 (de) 2017-05-03 2018-11-08 Valeo Siemens Eautomotive Germany Gmbh Inverter
WO2021258352A1 (fr) * 2020-06-24 2021-12-30 华为技术有限公司 Composant électrique, carte de circuit imprimé et alimentation électrique à découpage

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
JP3379419B2 (ja) 1998-01-16 2003-02-24 松下電器産業株式会社 複合形リアクタとその製造方法と電源装置
US6737951B1 (en) 2002-11-01 2004-05-18 Metglas, Inc. Bulk amorphous metal inductive device
US20140176289A1 (en) 2012-12-21 2014-06-26 Samsung Electro-Mechanics Co., Ltd. Electromagnetic interference filter and method of manufacturing the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080303624A1 (en) * 2007-06-08 2008-12-11 Nec Tokin Corporation Inductor
US20090051478A1 (en) * 2007-08-20 2009-02-26 Cheng-Hong Lee Filter and manufacturing method thereof
US20100289607A1 (en) * 2009-05-15 2010-11-18 Delta Electronics, Inc. Transformer structure
DE102017109499A1 (de) 2017-05-03 2018-11-08 Valeo Siemens Eautomotive Germany Gmbh Inverter
WO2021258352A1 (fr) * 2020-06-24 2021-12-30 华为技术有限公司 Composant électrique, carte de circuit imprimé et alimentation électrique à découpage
EP4152351A1 (fr) * 2020-06-24 2023-03-22 Huawei Technologies Co., Ltd. Composant électrique, carte de circuit imprimé et alimentation électrique à découpage

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