WO2021205565A1 - Bobine d'arrêt à double mode - Google Patents

Bobine d'arrêt à double mode Download PDF

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Publication number
WO2021205565A1
WO2021205565A1 PCT/JP2020/015816 JP2020015816W WO2021205565A1 WO 2021205565 A1 WO2021205565 A1 WO 2021205565A1 JP 2020015816 W JP2020015816 W JP 2020015816W WO 2021205565 A1 WO2021205565 A1 WO 2021205565A1
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Prior art keywords
magnetic
leg
central
permeability
choke coil
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PCT/JP2020/015816
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English (en)
Japanese (ja)
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白木　康博
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三菱電機株式会社
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Priority to PCT/JP2020/015816 priority Critical patent/WO2021205565A1/fr
Publication of WO2021205565A1 publication Critical patent/WO2021205565A1/fr

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    • 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
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/09—Filters comprising mutual inductance

Definitions

  • This disclosure relates to a dual mode choke coil.
  • Patent Document 1 discloses a dual-mode choke coil.
  • the dual mode choke coil includes a first magnetic core, a second magnetic core, a first coil, and a second coil. A gap is provided between the first magnetic core and the second magnetic core.
  • the dual mode choke coil is arranged in the electric circuit connecting the power supply and the inverter connected to the load, for example.
  • Electromagnetic interference (EMI) noise is generated by the high-speed switching operation of the inverter.
  • This EMI noise mainly includes normal mode noise and common mode noise.
  • the normal mode noise propagates as a normal mode noise current between the positive side electric wire and the negative side electric wire extending between the power supply and the inverter. Therefore, the normal mode noise current propagates in the positive and negative electric wires extending between the power supply and the inverter in opposite directions.
  • the common mode noise propagates as a common mode noise current between the positive wire and the ground and between the negative wire and the ground. Therefore, the common mode noise current propagates in the same direction between the positive side electric wire and the negative side electric wire extending between the power supply and the inverter.
  • the first AC magnetic flux formed by the normal mode noise current passes through the first magnetic core and the second magnetic core.
  • the second AC magnetic flux formed by the common mode noise current passes through the first magnetic core and the second magnetic core.
  • the first magnetic core and the second magnetic core have a high inductance with respect to the first AC magnetic flux and the second AC magnetic flux, so that the first magnetic core and the second magnetic core have the first AC magnetic flux. It has a high impedance with respect to the second AC magnetic flux.
  • the dual mode choke coil attenuates and eliminates the normal mode noise current and the common mode noise current. It functions as a noise filter for normal mode noise current and common mode noise current.
  • the dual mode choke coil When the dual mode choke coil is connected to a DC power supply, a direct current flows from the DC power supply to the dual mode choke coil.
  • the direct current magnetic flux formed by this direct current passes through the first magnetic core and the second magnetic core.
  • the direct current propagates between the positive and negative wires extending between the power supply and the inverter, similar to the normal mode noise current. Therefore, the magnetic path of the DC magnetic flux in the dual mode choke coil is the same as the magnetic path of the first AC magnetic flux in the dual mode choke coil.
  • the DC magnetic flux causes magnetic saturation of the first magnetic core and the second magnetic core with respect to the smaller first AC magnetic flux.
  • the inductance of the dual-mode choke coil with respect to the normal-mode noise current decreases, and the impedance of the dual-mode choke coil with respect to the normal-mode noise current also decreases. The ability of the dual mode choke coil to remove normal mode noise current is reduced.
  • the length of the gap between the first magnetic core and the second magnetic core is increased to increase the length of the gap between the first magnetic core and the second magnetic core. It is necessary to prevent magnetic saturation of the.
  • the inductance of the dual mode choke coil with respect to the normal mode noise current decreases, and the dual mode choke coil with respect to the normal mode noise current decreases. Impedance also drops. The ability of the dual mode choke coil to remove normal mode noise current is reduced.
  • the present disclosure has been made in view of the above problems, and an object thereof is to suppress a decrease in the ability of a dual mode choke coil to remove a normal mode noise current.
  • the dual mode choke coil of the present disclosure can remove the normal mode noise current and the common mode noise current.
  • the dual mode choke coil includes a first magnetic core, a second magnetic core, a magnetic cylinder, a first coil, and a second coil.
  • the first magnetic core includes a first yoke, a first side magnetic leg, a second side magnetic leg, and a first central magnetic leg.
  • the first side magnetic leg, the second side magnetic leg, and the first central magnetic leg extend from the first yoke.
  • the first central magnetic leg is arranged between the first side magnetic leg and the second side magnetic leg.
  • the second magnetic core includes a second yoke, a third side magnetic leg, a fourth side magnetic leg, and a second central magnetic leg.
  • the third side magnetic leg, the fourth side magnetic leg, and the second central magnetic leg extend from the second yoke.
  • the second central magnetic leg is arranged between the third side magnetic leg and the fourth side magnetic leg.
  • the first side magnetic leg and the third side magnetic leg are in contact with each other.
  • the second side magnetic leg and the fourth side magnetic leg are in contact with each other.
  • the first central magnetic leg and the second central magnetic leg are separated from each other with a first gap.
  • the first central magnetic leg and the second central magnetic leg are inserted into the magnetic cylinder and separated from the magnetic cylinder.
  • the magnetic cylinder is separated from the first yoke with a second gap.
  • the magnetic cylinder is separated from the second yoke with a third gap.
  • the first coil is wound around a first side magnetic leg and a third side magnetic leg.
  • the second coil is wound around a second side magnetic leg and a fourth side magnetic leg.
  • the first winding direction of the first coil is opposite to the second winding direction of the second coil.
  • the first reluctance of the first central magnetic path with respect to the AC magnetic flux is smaller than the second magnetic resistance of the second central magnetic path with respect to the AC magnetic flux.
  • the AC magnetic flux is formed by the normal mode noise current flowing through the first coil and the second coil.
  • the third reluctance of the first central magnetic path with respect to the DC magnetic flux is larger than the fourth magnetic resistance of the second central magnetic path with respect to the DC magnetic flux.
  • the direct current magnetic flux is formed by the direct current flowing through the first coil and the second coil.
  • the first central magnetic path is a magnetic path formed by the first central magnetic leg, the first gap, and the second central magnetic leg.
  • the second central magnetic path is a magnetic path formed by the second gap, the magnetic cylinder, and the third gap.
  • the magnetic path of the AC magnetic flux formed by the normal mode noise current can be made different from the magnetic path of the DC magnetic flux formed by the DC current.
  • the first magnetic core and the second with respect to the AC magnetic flux formed by the normal mode noise current without increasing the first gap length of the first gap between the first central magnetic leg and the second central magnetic leg. Magnetic saturation of the magnetic core is less likely to occur.
  • the length of the first gap of the first gap between the first central magnetic leg and the second central magnetic leg is not increased, the decrease in the inductance and impedance of the dual mode choke coil with respect to the normal mode noise current can be suppressed. In this way, it is possible to suppress a decrease in the noise removing ability of the dual mode choke coil with respect to the normal mode noise current.
  • FIG. 5 is a schematic cross-sectional view taken along the cross-sectional line III-III shown in FIG. 2 of the dual-mode choke coil of the first embodiment.
  • FIG. 5 is a schematic cross-sectional view taken along the cross-sectional line IV-IV shown in FIG. 2 of the dual-mode choke coil of the first embodiment.
  • FIG. 5 is a schematic cross-sectional view taken along the cross-sectional line VV shown in FIG. 2 of the dual-mode choke coil of the first embodiment.
  • FIG. 1 shows the graph which shows the frequency characteristic of the specific magnetic permeability of a 1st magnetic core, the frequency characteristic of the specific magnetic permeability of a 2nd magnetic core, and the frequency characteristic of the specific magnetic permeability of a magnetic cylinder.
  • FIG. 1 shows the magnetic path of the 1st AC magnetic flux formed by the normal mode noise current in the dual mode choke coil of Embodiment 1.
  • FIG. It is the schematic which shows the magnetic path of the direct current magnetic flux formed by the direct current in the dual mode choke coil of Embodiment 1.
  • FIG. It is the schematic which shows the magnetic path of the 2nd AC magnetic flux formed by the common mode noise current in the dual mode choke coil of Embodiment 1.
  • FIG. 5 is a schematic cross-sectional view taken along the cross-sectional line XI-XI shown in FIG. 10 of the dual-mode choke coil of the second embodiment.
  • FIG. 5 is a schematic cross-sectional view taken along the cross-sectional line XII-XII shown in FIG. 10 of the dual-mode choke coil of the second embodiment.
  • FIG. 5 is a schematic cross-sectional view taken along the cross-sectional line XIII-XIII shown in FIG. 10 of the dual-mode choke coil of the second embodiment.
  • Embodiment 1 The power conversion device 2 of the first embodiment will be described with reference to FIG.
  • the power conversion device 2 is connected to the DC power supply 3 and the load 9.
  • the DC power supply 3 may include an AC power supply (not shown) and a rectifier (not shown) that converts an AC voltage from the AC power supply into a tidal current voltage.
  • the load 9 is, for example, a motor.
  • the power conversion device 2 includes a positive electric wire 4a, a negative electric wire 4b, a capacitor 5, a dual mode choke coil 1, a capacitor 6a, a capacitor 6b, and an inverter 8.
  • the positive side electric wire 4a is connected to the positive electrode of the DC power supply 3.
  • the positive side electric wire 4a extends from the DC power supply 3 to the inverter 8.
  • the negative side electric wire 4b is connected to the negative electrode of the DC power supply 3.
  • the negative wire 4b extends from the DC power supply 3 to the inverter 8.
  • the capacitor 5 is connected to the positive side electric wire 4a and the negative side electric wire 4b.
  • the capacitor 5 is arranged on the input side (DC power supply 3 side) of the dual mode choke coil 1.
  • the dual mode choke coil 1 is connected to the positive side electric wire 4a and the negative side electric wire 4b.
  • the inverter 8 is connected to the positive side electric wire 4a and the negative side electric wire 4b.
  • the inverter 8 is arranged on the output side (load 9 side) of the dual mode choke coil 1.
  • a load 9 is connected to the output side of the inverter 8.
  • the inverter 8 includes a plurality of switching elements (not shown) such as a metal oxide semiconductor field effect transistor (MOSFET) or an insulated gate bipolar transistor (IGBT).
  • MOSFET metal oxide semiconductor field effect transistor
  • IGBT insulated gate bipolar transistor
  • the capacitor 6a is connected to the portion of the positive electric wire 4a extending between the dual mode choke coil 1 and the inverter 8 and the ground 7.
  • the capacitor 6b is connected to a portion of the negative electric wire 4b extending between the dual mode choke coil 1 and the inverter 8 and the ground 7.
  • Electromagnetic interference (EMI) noise is generated by the high-speed switching operation of the inverter 8.
  • This EMI noise mainly includes normal mode noise and common mode noise.
  • the normal mode noise propagates as a normal mode noise current between the positive side electric wire 4a and the negative side electric wire 4b extending between the DC power supply 3 and the inverter 8.
  • the common mode noise propagates as a common mode noise current between the positive side electric wire 4a and the ground and between the negative side electric wire 4b and the ground.
  • the normal mode noise current and the common mode noise current are alternating currents because they are generated due to the high-speed switching operation of the inverter 8.
  • the dual mode choke coil 1 can attenuate the normal mode noise current and the common mode noise current to remove the normal mode noise current and the common mode noise current.
  • the dual mode choke coil 1 of the first embodiment will be described with reference to FIGS. 2 to 6.
  • the dual mode choke coil 1 includes a first magnetic core 10, a second magnetic core 20, a first coil 30, a second coil 35, and a magnetic cylinder 40.
  • the first magnetic core 10 includes a first yoke 11, a first side magnetic leg 13, a second side magnetic leg 14, and a first central magnetic leg 12.
  • the longitudinal direction of the first yoke 11 is the x direction.
  • the first side magnetic leg 13, the second side magnetic leg 14, and the first central magnetic leg 12 extend from the first yoke 11.
  • the first central magnetic leg 12 is arranged between the first side magnetic leg 13 and the second side magnetic leg 14.
  • the longitudinal direction of the first side magnetic leg 13 is, for example, the y direction perpendicular to the longitudinal direction (x direction) of the first yoke 11.
  • the longitudinal direction (y direction) of the second side magnetic leg 14 is, for example, the y direction perpendicular to the longitudinal direction (x direction) of the first yoke 11.
  • the longitudinal direction of the first central magnetic leg 12 is, for example, the y direction perpendicular to the longitudinal direction (x direction) of the first yoke 11.
  • the first magnetic core 10 is an E-type core.
  • the first central magnetic leg 12 has a length L 12 , a width a 1, and a height b 1 .
  • the length L 12 of the first central magnetic leg 12 is the length of the first central magnetic leg 12 in the longitudinal direction (y direction) of the first central magnetic leg 12.
  • the width a 1 of the first central magnetic leg 12 is perpendicular to the longitudinal direction (y direction) of the first central magnetic leg 12 and is along the longitudinal direction (x direction) of the first yoke 11. It is the length of the first central magnetic leg 12 in the width direction (x direction).
  • the height b 1 of the first central magnetic leg 12 is the first central magnetic leg 12 perpendicular to the longitudinal direction (y direction) of the first central magnetic leg 12 and the width direction (x direction) of the first central magnetic leg 12. It is the length of the first central magnetic leg 12 in the height direction (z direction) of.
  • Sectional area S 12 of the first central magnetic leg 12 is given by the product of width a 1 and a height b 1.
  • the cross-sectional area S 12 of the first central magnetic leg 12 is the area of the first central magnetic leg 12 in the cross section perpendicular to the longitudinal direction (y direction) of the first central magnetic leg 12.
  • the width a 1 of the first central magnetic leg 12 may be equal to the height b 1 of the first central magnetic leg 12, and the cross section of the first central magnetic leg 12 may have a square shape.
  • the width a 1 of the first central magnetic leg 12 may be different from the height b 1 of the first central magnetic leg 12, and the cross section of the first central magnetic leg 12 may have a rectangular shape.
  • the first side magnetic leg 13 includes an end face 13a distal to the first yoke 11.
  • the second side magnetic leg 14 includes an end face 14a distal to the first yoke 11.
  • the first central magnetic leg 12 includes an end face 12a distal to the first yoke 11.
  • the second magnetic core 20 includes a second yoke 21, a third side magnetic leg 23, a fourth side magnetic leg 24, and a second central magnetic leg 22.
  • the longitudinal direction of the second yoke 21 is the x direction.
  • the third side magnetic leg 23, the fourth side magnetic leg 24, and the second central magnetic leg 22 extend from the second yoke 21.
  • the second central magnetic leg 22 is arranged between the third side magnetic leg 23 and the fourth side magnetic leg 24.
  • the longitudinal direction of the third side magnetic leg 23 is, for example, the y direction perpendicular to the longitudinal direction (x direction) of the second yoke 21.
  • the longitudinal direction (y direction) of the fourth side magnetic leg 24 is, for example, the y direction perpendicular to the longitudinal direction (x direction) of the second yoke 21.
  • the longitudinal direction of the second central magnetic leg 22 is, for example, the y direction perpendicular to the longitudinal direction (x direction) of the second yoke 21.
  • the second magnetic core 20 is an E-
  • the second central magnetic leg 22 has a length L 22 and a width a 2 and a height b 2 .
  • the length L 22 of the second central magnetic leg 22 is the length of the second central magnetic leg 22 in the longitudinal direction (y direction) of the second central magnetic leg 22.
  • the width a 2 of the second central magnetic leg 22 is perpendicular to the longitudinal direction (y direction) of the second central magnetic leg 22 and is along the longitudinal direction (x direction) of the second yoke 21. It is the length of the second central magnetic leg 22 in the width direction (x direction).
  • the height b 2 of the second central magnetic leg 22 is the second central magnetic leg 22 perpendicular to the longitudinal direction (y direction) of the second central magnetic leg 22 and the width direction (x direction) of the second central magnetic leg 22. Is the length of the second central magnetic leg 22 in the height direction (z direction) of.
  • Sectional area S 22 of the second central magnetic leg 22 is given by the product of width a 2 and height b 2.
  • the cross-sectional area S 22 of the second central magnetic leg 22 is the area of the second central magnetic leg 22 in the cross section perpendicular to the longitudinal direction (y direction) of the second central magnetic leg 22.
  • the width a 2 of the second central magnetic leg 22 may be equal to the height b 2 of the second central magnetic leg 22, and the cross section of the second central magnetic leg 22 may have a square shape.
  • the width a 2 of the second central magnetic leg 22 may be different from the height b 2 of the second central magnetic leg 22, and the cross section of the second central magnetic leg 22 may have a rectangular shape.
  • Width a 2 of the second central magnetic leg 22 is equal to the width a 1 of the first central magnetic leg 12, and the height b 2 of the second center leg 22 to the height b 1 of the first central magnetic leg 12 May be equal.
  • Sectional area S 22 of the second central magnetic leg 22 may be equal to the cross-sectional area S 12 of the first central magnetic leg 12.
  • the third side magnetic leg 23 includes an end face 23a distal to the second yoke 21.
  • the fourth side magnetic leg 24 includes an end face 24a distal to the second yoke 21.
  • the second central magnetic leg 22 includes an end face 22a distal to the second yoke 21.
  • the first side magnetic leg 13 and the third side magnetic leg 23 are in contact with each other. Specifically, the end surface 13a of the first side magnetic leg 13 is in surface contact with the end surface 23a of the third side magnetic leg 23.
  • the second side magnetic leg 14 and the fourth side magnetic leg 24 are in contact with each other. Specifically, the end surface 14a of the second side magnetic leg 14 is in surface contact with the end surface 24a of the fourth side magnetic leg 24.
  • the first central magnetic leg 12 and the second central magnetic leg 22 are separated from each other with a first gap 17. Specifically, the end surface 12a of the first central magnetic leg 12 and the end surface 22a of the second central magnetic leg 22 are separated from each other with a first gap 17.
  • the first gap length G 1 of the first gap 17 includes the first central magnetic leg 12 (end face 12a) and the second central magnetic leg 22 (end face 22a) in the longitudinal direction (y direction) of the first central magnetic leg 12. Is the length between.
  • the first magnetic core 10 and the second magnetic core 20 are made of a soft magnetic material.
  • the first magnetic core 10 and the second magnetic core 20 are, for example, a ferrite core, an amorphous core, or an iron dust core.
  • the ferrite core is, for example, a manganese-zinc (Mn—Zn) -based ferrite core or a nickel-zinc (Ni—Zn) -based ferrite core.
  • the amorphous core is formed of, for example, an iron-based amorphous alloy.
  • the iron dust core is a magnetic core formed by pressure molding iron powder.
  • the iron dust core is made of, for example, any material selected from the group consisting of pure iron, Fe—Si alloys, Fe—Si—Al alloys, Ni—Fe alloys or Ni—Fe—Mo alloys.
  • the first coil 30 is a conducting wire made of a metal material such as copper, for example.
  • the first coil 30 is wound around the first side magnetic leg 13 and the third side magnetic leg 23.
  • the first coil 30 is a part of the positive electric wire 4a.
  • a terminal 31 is provided at the end of the first coil 30 proximal to the DC power supply 3.
  • a terminal 32 is provided at the end of the first coil 30 proximal to the inverter 8.
  • the second coil 35 is a conducting wire made of a metal material such as copper, for example.
  • the second coil 35 is wound around the second side magnetic leg 14 and the fourth side magnetic leg 24.
  • the second coil 35 is a part of the negative side electric wire 4b.
  • a terminal 36 is provided at the end of the second coil 35 proximal to the DC power supply 3.
  • a terminal 37 is provided at the end of the second coil 35 proximal to the inverter 8.
  • the first winding direction of the first coil 30 is opposite to the second winding direction of the second coil 35.
  • the longitudinal direction of the magnetic cylinder 40 is the longitudinal direction (y direction) of the first central magnetic leg 12 and the longitudinal direction (y direction) of the second central magnetic leg 22. As shown in FIG. 3, the magnetic cylinder 40 has a length L 40 .
  • the length L 40 of the magnetic cylinder 40 is the length of the magnetic cylinder 40 in the longitudinal direction (y direction) of the magnetic cylinder 40.
  • the magnetic cylinder 40 includes an end face 41 facing the first yoke 11 and an end face 42 facing the second yoke 21.
  • the magnetic cylinder 40 is separated from the first yoke 11 with a second gap 43.
  • the second gap length G 2 of the second gap 43 is the length between the first yoke 11 and the magnetic cylinder 40 (end surface 41) in the longitudinal direction (y direction) of the magnetic cylinder 40.
  • the magnetic cylinder 40 is separated from the second yoke 21 with a third gap 44.
  • the third gap length G 3 of the third gap 44 is the length between the second yoke 21 and the magnetic cylinder 40 (end surface 42) in the longitudinal direction (y direction) of the magnetic cylinder 40.
  • the first gap length G 1 of the first gap 17 between the first central magnetic leg 12 and the second central magnetic leg 22 is the second gap length G 2 of the second gap 43 and the third gap of the third gap 44. it may be greater than the sum of the length G 3.
  • the first central magnetic leg 12 and the second central magnetic leg 22 are inserted into the magnetic cylinder 40.
  • the end surface 12a of the first central magnetic leg 12, the end surface 22a of the second central magnetic leg 22, and the first gap 17 between the first central magnetic leg 12 and the second central magnetic leg 22 are magnetic cylinders 40. It is in the cavity of the magnetic cylinder 40 defined by the inner surface 40b of the.
  • the magnetic cylinder 40 is separated from the first central magnetic leg 12 and the second central magnetic leg 22. Specifically, the inner surface 40b of the magnetic cylinder 40 is separated from the first central magnetic leg 12 and the second central magnetic leg 22.
  • the gap length g 11 (see FIG. 4) between the first central magnetic leg 12 and the inner surface 40b of the magnetic cylinder 40 in the width direction (x direction) of the first central magnetic leg 12 is the first central magnetic leg. It may be equal to the gap length g 12 (see FIG. 4) between the first central magnetic leg 12 and the inner surface 40b of the magnetic cylinder 40 in the height direction (z direction) of 12.
  • the gap length g 21 (see FIG.
  • the second central magnetic leg 22 between the second central magnetic leg 22 and the inner surface 40b of the magnetic cylinder 40 in the width direction (x direction) of the second central magnetic leg 22 is the second central magnetic leg 22. It may be equal to the gap length g 22 (see FIG. 5) between the second central magnetic leg 22 and the inner surface 40b of the magnetic cylinder 40 in the height direction (z direction) of 22.
  • the gap length g 11 (see FIG. 4) between the first central magnetic leg 12 and the inner surface 40b of the magnetic cylinder 40 in the width direction (x direction) of the first central magnetic leg 12 is the second central magnetic leg. It may be equal to the gap length g 21 (see FIG. 5) between the second central magnetic leg 22 and the inner surface 40b of the magnetic cylinder 40 in the width direction (x direction) of 22.
  • the gap length g 12 (see FIG. 4) between the first central magnetic leg 12 and the inner surface 40b of the magnetic cylinder 40 in the height direction (z direction) of the first central magnetic leg 12 is the second central magnetic leg. It may be equal to the gap length g 22 (see FIG. 5) between the second central magnetic leg 22 and the inner surface 40b of the magnetic cylinder 40 in the height direction (z direction) of the leg 22.
  • the outer surface 40a of the magnetic cylinder 40 has a width p 1 and a height p 2 .
  • the width p 1 of the outer surface 40a of the magnetic cylinder 40 is perpendicular to the longitudinal direction (y direction) of the magnetic cylinder 40 and is the width direction of the magnetic cylinder 40 along the longitudinal direction (x direction) of the first yoke 11. It is the length of the outer surface 40a of the magnetic cylinder 40 in the (x direction).
  • the height p 2 of the outer surface 40a of the magnetic cylinder 40 is the height direction of the magnetic cylinder 40 perpendicular to the longitudinal direction (y direction) of the magnetic cylinder 40 and the width direction (x direction) of the magnetic cylinder 40.
  • Z direction is the length of the outer surface 40a of the magnetic cylinder 40.
  • the width p 1 of the outer surface 40a of the magnetic cylinder 40 may be equal to the height p 2 of the outer surface 40a of the magnetic cylinder 40, or different from the height p 2 of the outer surface 40a of the magnetic cylinder 40. May be good.
  • the inner surface 40b of the magnetic cylinder 40 has a width q 1 and a height q 2 .
  • the width q 1 of the inner surface 40b of the magnetic cylinder 40 is perpendicular to the longitudinal direction (y direction) of the magnetic cylinder 40 and is the width direction of the magnetic cylinder 40 along the longitudinal direction (x direction) of the first yoke 11. It is the length of the inner surface 40b of the magnetic cylinder 40 in the (x direction).
  • the height q 2 of the inner surface 40b of the magnetic cylinder 40 is the height direction of the magnetic cylinder 40 perpendicular to the longitudinal direction (y direction) of the magnetic cylinder 40 and the width direction (x direction) of the magnetic cylinder 40.
  • the width q 1 of the inner surface 40b of the magnetic cylinder 40 may be equal to the height q 2 of the inner surface 40b of the magnetic cylinder 40.
  • the width q 1 of the inner surface 40b of the magnetic cylinder 40 may be equal to the height q 2 of the inner surface 40b of the magnetic cylinder 40, or different from the height q 2 of the inner surface 40b of the magnetic cylinder 40. May be good.
  • the cross-sectional area S 40 of the magnetic cylinder 40 is given by the equation (1).
  • the cross-sectional area S 40 of the magnetic cylinder 40 is the area of the magnetic cylinder 40 in a cross section perpendicular to the longitudinal direction (y direction) of the magnetic cylinder 40.
  • the magnetic cylinder 40 is made of a material different from that of the first magnetic core 10 and the second magnetic core 20.
  • the saturation magnetic flux density of the magnetic cylinder 40 is larger than the saturation magnetic flux density of the first magnetic core 10 and larger than the saturation magnetic flux density of the second magnetic core 20.
  • the saturation magnetic flux density of the magnetic cylinder 40 is, for example, 1.5 tesla or more.
  • the magnetic cylinder 40 is made of, for example, a rolled steel material for general structure (SS material), a silicon steel plate, or a permalloy.
  • the frequency characteristic ⁇ r40 ( ⁇ ) of the specific magnetic permeability of the magnetic cylinder 40 is different from the frequency characteristic of the specific magnetic permeability of the first central magnetic leg 12 of the first magnetic core 10.
  • the first yoke 11, the first central magnetic leg 12, the first side magnetic leg 13 and the second side magnetic leg 14 are formed of a single magnetic material, and the first magnetic core 10 is the first. 1
  • the frequency characteristic of the relative permeability of the central magnetic leg 12 is equal to the frequency characteristic ⁇ r10 ( ⁇ ) of the relative permeability of the first magnetic core 10.
  • the frequency characteristic ⁇ r40 ( ⁇ ) of the specific magnetic permeability of the magnetic cylinder 40 is different from the frequency characteristic ⁇ r10 ( ⁇ ) of the specific magnetic permeability of the first magnetic core 10.
  • the frequency characteristic ⁇ r40 ( ⁇ ) of the specific magnetic permeability of the magnetic cylinder 40 is different from the frequency characteristic of the specific magnetic permeability of the second central magnetic leg 22 of the second magnetic core 20.
  • the second yoke 21, the second central magnetic leg 22, the third side magnetic leg 23, and the fourth side magnetic leg 24 are formed of a single magnetic material, and the second magnetic core 20 is the second. 2.
  • the frequency characteristic of the relative permeability of the central magnetic leg 22 is equal to the frequency characteristic ⁇ r10 ( ⁇ ) of the relative permeability of the second magnetic core 20.
  • the frequency characteristic ⁇ r40 ( ⁇ ) of the specific magnetic permeability of the magnetic cylinder 40 is different from the frequency characteristic ⁇ r20 ( ⁇ ) of the specific magnetic permeability of the second magnetic core 20.
  • ⁇ n is the frequency of the first alternating magnetic field formed by the normal mode noise current.
  • the frequency ⁇ n of the first AC magnetic field is equal to the frequency of the normal mode noise current.
  • ⁇ c is the frequency of the second AC magnetic field formed by the common mode noise current.
  • the frequency ⁇ c of the second AC magnetic field is equal to the frequency of the common mode noise current.
  • the normal mode noise current and the common mode noise current are generated due to the high-speed switching operation of the inverter 8 (see FIG. 1). Therefore, the frequency of the common mode noise current is substantially equal to the frequency of the normal mode noise current, and the frequency ⁇ c of the second AC magnetic field is substantially equal to the frequency ⁇ n of the first AC magnetic field.
  • the frequency ⁇ n of the first AC magnetic field is, for example, 1 kHz or more.
  • the frequency ⁇ n of the first AC magnetic field is, for example, 500 kHz or less.
  • the frequency ⁇ n of the first AC magnetic field may be 150 kHz or less.
  • the frequency ⁇ c of the second AC magnetic field is, for example, 1 kHz or more.
  • the frequency ⁇ c of the second AC magnetic field is, for example, 500 kHz or less.
  • the frequency ⁇ c of the second AC magnetic field may be 150 kHz or less.
  • the direct current is formed by a direct current flowing from the direct current power source 3 to the positive electric wire 4a including the first coil 30 and the negative electric wire 4b including the second coil 35.
  • the relative magnetic permeability of the vacuum with respect to the first AC magnetic field is equal to 1.
  • the relative permeability of the vacuum with respect to the second AC magnetic field is equal to 1.
  • the relative magnetic permeability of a vacuum with respect to a DC magnetic field is equal to 1.
  • the first AC magnetic flux is formed by the normal mode noise current.
  • the frequency ⁇ n of the first AC magnetic flux is equal to the frequency of the normal mode noise current.
  • the first central magnetic path is a magnetic path formed by the first central magnetic leg 12, the first gap 17, and the second central magnetic leg 22.
  • the second central magnetic path is a magnetic path formed by the second gap 43, the magnetic cylinder 40, and the third gap 44.
  • the direct current magnetic flux is formed by a direct current flowing through the positive electric wire 4a including the first coil 30 and the negative electric wire 4b including the second coil 35.
  • the magnetic flux density of the DC magnetic flux in the magnetic cylinder 40 is smaller than the saturation magnetic flux density of the magnetic cylinder 40.
  • the first reluctance R mca ( ⁇ ) of the first central magnetic path is given by the equation (2).
  • R mca ( ⁇ ) R m12 ( ⁇ ) + R m17 ( ⁇ ) + R m22 ( ⁇ ) (2)
  • R m12 ( ⁇ ) represents the reluctance of the first central magnetic leg 12
  • R m17 ( ⁇ ) represents the reluctance of the first gap 17
  • R m22 ( ⁇ ) represents the reluctance of the second central magnetic leg 22.
  • the width a 1 of the first central magnetic leg 12 is equal to the width a 2 of the second central magnetic leg 22
  • the height b 1 of the first central magnetic leg 12 is equal to the height b 2 of the second central magnetic leg 22.
  • the second reluctance R mcb ( ⁇ ) of the second central magnetic path is given by Eq. (6).
  • R mcb ( ⁇ ) R m43 ( ⁇ ) + R m40 ( ⁇ ) + R m44 ( ⁇ ) (6)
  • R m43 ( ⁇ ) represents the reluctance of the second gap 43
  • R m40 ( ⁇ ) represents the reluctance of the magnetic cylinder 40
  • R m44 ( ⁇ ) represents the reluctance of the third gap 44.
  • R m43 ( ⁇ ) is given by equation (7)
  • R m40 ( ⁇ ) is given by equation (8)
  • R m44 ( ⁇ ) is given by equation (9).
  • ⁇ r43 ( ⁇ ) is equal to 1.
  • ⁇ r44 ( ⁇ ) is equal to 1.
  • the equation (10) holds with respect to the magnitude relationship of the relative magnetic permeability of the substances constituting the first central magnetic
  • the equation (14) holds with respect to the magnitude relationship of the relative magnetic permeability of the substances constituting the second central magnetic path with respect to the DC magnetic field.
  • Normal mode noise current I n propagates between the positive side wire 4a and the negative wire 4b extending between the DC power source 3 and the inverter 8.
  • the first winding direction of the first coil 30 is opposite to the second winding direction of the second coil 35. Therefore, the normal mode noise current I n from the inverter 8 (see FIG. 1) flows in opposite directions and a negative wire 4b which includes a positive-side wire 4a and the second coil 35 including the first coil 30.
  • the DC current I dc from the DC power supply 3 also flows in opposite directions to the positive side electric wire 4a including the first coil 30 and the negative side electric wire 4b including the second coil 35.
  • the DC magnetic flux 53 formed by the DC current I dc flowing through the first coil 30 includes the first yoke 11, the second gap 43, the magnetic cylinder 40, and the third gap. It passes through a second central magnetic path formed by 44 and a magnetic path formed by a second yoke 21, a third side magnetic leg 23, and a first side magnetic leg 13.
  • the DC magnetic flux 54 formed by the DC current I dc flowing through the second coil 35 is a second central magnetic path formed by the first yoke 11, the second gap 43, the magnetic cylinder 40, and the third gap 44. 2 Passes through a magnetic path formed by a yoke 21, a fourth side magnetic leg 24, and a second side magnetic leg 14.
  • first magnetic center leg 12 does not increase the first gap length G 1 of the first gap 17 between the second central magnetic leg 22, reduction in the inductance of the dual-mode choke coil 1 is against the normal mode noise current I n Can be suppressed.
  • the decrease in impedance of the dual mode choke coil 1 with respect to the normal mode noise current can be suppressed.
  • the inductance of a magnetic core is proportional to the relative permeability of the magnetic core. Therefore, the first alternating magnetic flux 50, 51 formed by the normal mode noise current I n, the dual-mode choke coil 1 has a large inductance.
  • the common mode noise Denryu I c is between Tadashigawa wire 4a and the ground, and propagates between the negative wire 4b and ground.
  • the first winding direction of the first coil 30 is opposite to the second winding direction of the second coil 35. Therefore, common-mode noise current I c from the inverter 8 (see FIG. 1) flows and a negative wire 4b which includes a positive-side wire 4a and the second coil 35 including the first coil 30 in the same direction.
  • the second AC magnetic flux 56 includes a first central magnetic path formed by the first central magnetic leg 12, the first gap 17, and the second central magnetic leg 22, the second gap 43, the magnetic cylinder 40, and the second. It does not pass through the second central magnetic path formed by the three gaps 44.
  • the normal mode noise current I n and the common mode noise current I c are generated by the switching operation of a plurality of switching elements included in the inverter 8 (see FIG. 1). Therefore, the frequency ⁇ c of the second AC magnetic field formed by the common mode noise current I c is substantially equal to the frequency ⁇ n of the first AC magnetic field formed by the normal mode noise current I n.
  • the inductance of a magnetic core is proportional to the relative permeability of the magnetic core. Therefore, the dual mode choke coil 1 has a large inductance with respect to the second AC magnetic flux 56 formed by the common mode noise current I c.
  • the dual mode choke coil 1 has a large impedance with respect to the second AC magnetic flux 56 formed by the common mode noise current I c. Therefore, the dual-mode choke coil 1 attenuates the common mode noise current I c, can be removed common-mode noise current I c.
  • the dual mode choke coil 1 of the present embodiment can remove the normal mode noise current and the common mode noise current.
  • the dual mode choke coil 1 includes a first magnetic core 10, a second magnetic core 20, a magnetic cylinder 40, a first coil 30, and a second coil 35.
  • the first magnetic core 10 includes a first yoke 11, a first side magnetic leg 13, a second side magnetic leg 14, and a first central magnetic leg 12.
  • the first side magnetic leg 13, the second side magnetic leg 14, and the first central magnetic leg 12 extend from the first yoke 11.
  • the first central magnetic leg 12 is arranged between the first side magnetic leg 13 and the second side magnetic leg 14.
  • the second magnetic core 20 includes a second yoke 21, a third side magnetic leg 23, a fourth side magnetic leg 24, and a second central magnetic leg 22.
  • the third side magnetic leg 23, the fourth side magnetic leg 24, and the second central magnetic leg 22 extend from the second yoke 21.
  • the second central magnetic leg 22 is arranged between the third side magnetic leg 23 and the fourth side magnetic leg 24.
  • the first side magnetic leg 13 and the third side magnetic leg 23 are in contact with each other.
  • the second side magnetic leg 14 and the fourth side magnetic leg 24 are in contact with each other.
  • the first central magnetic leg 12 and the second central magnetic leg 22 are separated from each other with a first gap 17.
  • the first central magnetic leg 12 and the second central magnetic leg 22 are inserted into the magnetic cylinder 40 and separated from the magnetic cylinder 40.
  • the magnetic cylinder 40 is separated from the first yoke 11 with a second gap 43.
  • the magnetic cylinder 40 is separated from the second yoke 21 with a third gap 44.
  • the first coil 30 is wound around the first side magnetic leg 13 and the third side magnetic leg 23.
  • the second coil 35 is wound around the second side magnetic leg 14 and the fourth side magnetic leg 24.
  • the first winding direction of the first coil 30 is opposite to the second winding direction of the second coil 35.
  • the first reluctance of the first central magnetic path with respect to the AC magnetic flux is smaller than the second magnetic resistance of the second central magnetic path with respect to the AC magnetic flux.
  • the AC magnetic flux is formed by the normal mode noise current flowing through the first coil 30 and the second coil 35.
  • the third reluctance of the first central magnetic path with respect to the DC magnetic flux is larger than the fourth magnetic resistance of the second central magnetic path with respect to the DC magnetic flux.
  • the direct current magnetic flux is formed by the direct current flowing through the first coil 30 and the second coil 35.
  • the first central magnetic path is a magnetic path formed by the first central magnetic leg 12, the first gap 17, and the second central magnetic leg 22.
  • the second central magnetic path is a magnetic path formed by the second gap 43, the magnetic cylinder 40, and the third gap 44.
  • the magnetic path of the AC magnetic flux formed by the normal mode noise current can be made different from the magnetic path of the DC magnetic flux formed by the DC current.
  • the first with respect to the AC magnetic flux formed by the normal mode noise current without increasing the first gap length G 1 of the first gap 17 between the first central magnetic leg 12 and the second central magnetic leg 22. Magnetic saturation of the magnetic core 10 and the second magnetic core 20 is less likely to occur. Since the first gap length G 1 of the first gap 17 between the first central magnetic leg 12 and the second central magnetic leg 22 is not increased, the decrease in the inductance of the dual mode choke coil 1 with respect to the normal mode noise current is suppressed. obtain. The decrease in impedance of the dual mode choke coil 1 with respect to the normal mode noise current can be suppressed. It is possible to suppress a decrease in the noise removing ability of the dual mode choke coil 1 with respect to the normal mode noise current.
  • the first relative magnetic permeability (specific magnetic permeability ⁇ r10 ( ⁇ ⁇ n )) of the first central magnetic leg 12 with respect to the AC magnetic field formed by the normal mode noise current
  • the magnetic path of the AC magnetic flux formed by the normal mode noise current can be made different from the magnetic path of the DC magnetic flux formed by the DC current.
  • the magnetic saturation of the first magnetic core 10 and the second magnetic core 20 is less likely to occur with respect to the AC magnetic flux formed by the normal mode noise current.
  • the decrease in impedance of the dual mode choke coil 1 with respect to the normal mode noise current can be suppressed. It is possible to suppress a decrease in the noise removing ability of the dual mode choke coil 1 with respect to the normal mode noise current.
  • the magnetic path of the AC magnetic flux formed by the normal mode noise current can be made different from the magnetic path of the DC magnetic flux formed by the DC current.
  • the magnetic saturation of the first magnetic core 10 and the second magnetic core 20 is less likely to occur with respect to the AC magnetic flux formed by the normal mode noise current.
  • the decrease in impedance of the dual mode choke coil 1 with respect to the normal mode noise current can be suppressed. It is possible to suppress a decrease in the noise removing ability of the dual mode choke coil 1 with respect to the normal mode noise current.
  • the magnetic path of the AC magnetic flux formed by the normal mode noise current can be made different from the magnetic path of the DC magnetic flux formed by the DC current.
  • the magnetic saturation of the first magnetic core 10 and the second magnetic core 20 is less likely to occur with respect to the AC magnetic flux formed by the normal mode noise current.
  • the decrease in impedance of the dual mode choke coil 1 with respect to the normal mode noise current can be suppressed. It is possible to suppress a decrease in the noise removing ability of the dual mode choke coil 1 with respect to the normal mode noise current.
  • the magnetic path of the AC magnetic flux formed by the normal mode noise current can be made different from the magnetic path of the DC magnetic flux formed by the DC current.
  • the magnetic saturation of the first magnetic core 10 and the second magnetic core 20 is less likely to occur with respect to the AC magnetic flux formed by the normal mode noise current.
  • the decrease in impedance of the dual mode choke coil 1 with respect to the normal mode noise current can be suppressed. It is possible to suppress a decrease in the noise removing ability of the dual mode choke coil 1 with respect to the normal mode noise current.
  • the first gap length G 1 of the first gap 17 is the second gap length G 2 of the second gap 43 and the third gap length G 3 of the third gap 44. Greater than the sum.
  • the magnetic path of the AC magnetic flux formed by the normal mode noise current can be made different from the magnetic path of the DC magnetic flux formed by the DC current.
  • the magnetic saturation of the first magnetic core 10 and the second magnetic core 20 is less likely to occur with respect to the AC magnetic flux formed by the normal mode noise current.
  • the decrease in impedance of the dual mode choke coil 1 with respect to the normal mode noise current can be suppressed. It is possible to suppress a decrease in the noise removing ability of the dual mode choke coil 1 with respect to the normal mode noise current.
  • the magnetic flux density of the DC magnetic flux in the magnetic cylinder 40 is smaller than the saturation magnetic flux density of the magnetic cylinder 40.
  • the saturation magnetic flux density of the magnetic cylinder 40 is 1.5 tesla or more.
  • the dual mode choke coil 1b of the second embodiment will be described with reference to FIGS. 10 to 13.
  • the dual-mode choke coil 1b of the present embodiment has the same configuration as the dual-mode choke coil 1 of the first embodiment, but is different from the dual-mode choke coil 1 of the first embodiment mainly in the following points. There is.
  • the dual mode choke coil 1b further includes a first non-magnetic spacer 46, a second non-magnetic spacer 47, and a third non-magnetic spacer 48.
  • the first non-magnetic spacer 46, the second non-magnetic spacer 47, and the third non-magnetic spacer 48 are a resin such as an epoxy resin, a silicone resin, an acrylic resin, or an acrylonitrile butadiene styrene (ABS) copolymer resin, or a ceramic. Is formed of.
  • the first non-magnetic spacer 46 fills the second gap 43.
  • the first non-magnetic spacer 46 is in contact with the magnetic cylinder 40 and the first yoke 11. Specifically, the first non-magnetic spacer 46 is in surface contact with the end surface 41 of the magnetic cylinder 40 and the surface of the first yoke 11 facing the end surface 41.
  • the second non-magnetic spacer 47 fills the third gap 44.
  • the second non-magnetic spacer 47 is in contact with the magnetic cylinder 40 and the second yoke 21. Specifically, the second non-magnetic spacer 47 is in surface contact with the end surface 42 of the magnetic cylinder 40 and the surface of the second yoke 21 facing the end surface 42.
  • the first non-magnetic spacer 46 can accurately define the second gap length G 2 of the second gap 43.
  • the second non-magnetic spacer 47 can accurately define the third gap length G 3 of the third gap 44.
  • the first non-magnetic spacer 46 and the second non-magnetic spacer 47 make it possible to accurately position the magnetic cylinder 40 with respect to the first magnetic core 10 and the second magnetic core 20.
  • the third non-magnetic spacer 48 is in contact with the inner surface 40b of the magnetic cylinder 40 and the side surface of the first central magnetic leg 12, and the inner surface 40b of the magnetic cylinder 40 and the second central magnetic leg 22. It is in contact with the side surface.
  • the third non-magnetic spacer 48 enables the magnetic cylinder 40 to be accurately positioned with respect to the first central magnetic leg 12 of the first magnetic core 10 and the second central magnetic leg 22 of the second magnetic core 20. ..
  • the third non-magnetic spacer 48 fills the first gap 17.
  • the third non-magnetic spacer 48 can accurately define the first gap length G 1 of the first gap 17.
  • the third non-magnetic spacer 48 enables the first magnetic core 10 (first central magnetic leg 12) and the second magnetic core 20 (second central magnetic leg 22) to be accurately positioned with each other.
  • the effect of the dual mode choke coil 1b of the present embodiment has the following effects in addition to the effect of the dual mode choke coil 1 of the first embodiment.
  • the dual mode choke coil 1b of the present embodiment further includes a first non-magnetic spacer 46 and a second non-magnetic spacer 47.
  • the first non-magnetic spacer 46 fills the second gap 43 and is in contact with the magnetic cylinder 40 and the first yoke 11.
  • the second non-magnetic spacer 47 fills the third gap 44 and is in contact with the magnetic cylinder 40 and the second yoke 21.
  • the magnetic cylinder 40 can be accurately positioned with respect to the first magnetic core 10 and the second magnetic core 20. It is possible to suppress a decrease in the noise removing ability of the dual mode choke coil 1b with respect to the normal mode noise current.
  • the dual mode choke coil 1b of the present embodiment further includes a third non-magnetic spacer 48.
  • the third non-magnetic spacer 48 is in contact with the inner surface 40b of the magnetic cylinder 40 and the first side surface of the first central magnetic leg 12, and the inner surface 40b of the magnetic cylinder 40 and the second central magnetic leg 12 are in contact with each other. It is in contact with the second side surface of 22.
  • the magnetic cylinder 40 can be accurately positioned with respect to the first central magnetic leg 12 of the first magnetic core 10 and the second central magnetic leg 22 of the second magnetic core 20. It is possible to suppress a decrease in the noise removing ability of the dual mode choke coil 1b with respect to the normal mode noise current.
  • the third non-magnetic spacer 48 fills the first gap 17.
  • the first magnetic core 10 (first central magnetic leg 12) and the second magnetic core 20 (second central magnetic leg 22) can be accurately positioned with each other. It is possible to suppress a decrease in the noise removing ability of the dual mode choke coil 1b with respect to the normal mode noise current.
  • 1,1b dual mode choke coil 2 power converter, 3 DC power supply, 4a positive wire, 4b negative wire, 5, 6a, 6b capacitor, 7 earth, 8 inverter, 9 load, 10 first magnetic core, 11 1st yoke, 12 1st central magnetic leg, 12a end face, 13 1st side magnetic leg, 13a end face, 14 2nd side magnetic leg, 14a end face, 17 1st gap, 20 2nd magnetic core, 21 2nd yoke, 22 2nd central magnetic leg, 22a end face, 23 3rd side magnetic leg, 23a end face, 24 4th side magnetic leg, 24a end face, 30 1st coil, 31, 32 terminals, 35 2nd coil, 36, 37 terminals, 40 magnetic cylinder, 40a outer surface, 40b inner surface, 41, 42 end face, 43 second gap, 44 third gap, 46 first non-magnetic spacer, 47 second non-magnetic spacer, 48 third non-magnetic spacer, 50 , 51 1st AC magnetic flux, 53, 54 DC magnetic flux, 56

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

La présente invention concerne une bobine d'arrêt à double mode (1) qui comprend : un premier noyau magnétique (10) ; un second noyau magnétique (20) ; un corps cylindrique magnétique (40) ; une première bobine (30) ; et une seconde bobine (35). Une première direction d'enroulement de la première bobine (30) est opposée à une seconde direction d'enroulement de la seconde bobine (35). Une première résistance magnétique d'un premier trajet magnétique central contre un flux magnétique à courant alternatif formé par un courant de bruit en mode normal est inférieure à une seconde résistance magnétique d'un second trajet magnétique central contre le flux magnétique à courant alternatif. Une troisième résistance magnétique du premier trajet magnétique central contre un flux magnétique à courant continu formé par un courant continu circulant à travers la première bobine (30) et la seconde bobine (35) est supérieure à une quatrième résistance magnétique d'un second trajet magnétique central contre le flux magnétique à courant continu.
PCT/JP2020/015816 2020-04-08 2020-04-08 Bobine d'arrêt à double mode WO2021205565A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/015816 WO2021205565A1 (fr) 2020-04-08 2020-04-08 Bobine d'arrêt à double mode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/015816 WO2021205565A1 (fr) 2020-04-08 2020-04-08 Bobine d'arrêt à double mode

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WO2021205565A1 true WO2021205565A1 (fr) 2021-10-14

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09237722A (ja) * 1996-02-28 1997-09-09 Tamura Seisakusho Co Ltd 複合コイル
JP2001285005A (ja) * 2000-03-31 2001-10-12 Soshin Electric Co Ltd ノイズフィルタ
JP2009206178A (ja) * 2008-02-26 2009-09-10 Hitachi Ferrite Electronics Ltd 電動パワーステアリング用ノイズ除去コイル部品
JP2015053464A (ja) * 2013-09-09 2015-03-19 台達電子企業管理（上海）有限公司 インダクタおよびそれを含むスイッチング回路

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09237722A (ja) * 1996-02-28 1997-09-09 Tamura Seisakusho Co Ltd 複合コイル
JP2001285005A (ja) * 2000-03-31 2001-10-12 Soshin Electric Co Ltd ノイズフィルタ
JP2009206178A (ja) * 2008-02-26 2009-09-10 Hitachi Ferrite Electronics Ltd 電動パワーステアリング用ノイズ除去コイル部品
JP2015053464A (ja) * 2013-09-09 2015-03-19 台達電子企業管理（上海）有限公司 インダクタおよびそれを含むスイッチング回路

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