WO2007004266A1 - Coupleur de signal - Google Patents

Coupleur de signal Download PDF

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Publication number
WO2007004266A1
WO2007004266A1 PCT/JP2005/012118 JP2005012118W WO2007004266A1 WO 2007004266 A1 WO2007004266 A1 WO 2007004266A1 JP 2005012118 W JP2005012118 W JP 2005012118W WO 2007004266 A1 WO2007004266 A1 WO 2007004266A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
coupling device
magnetic cores
gap
signal coupling
Prior art date
Application number
PCT/JP2005/012118
Other languages
English (en)
Japanese (ja)
Inventor
Yuichiro Murata
Sawako Ojima
Masataka Kato
Takao Tsurimoto
Takashi Hifumi
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
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 Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to PCT/JP2005/012118 priority Critical patent/WO2007004266A1/fr
Priority to PCT/JP2006/312353 priority patent/WO2007004419A1/fr
Priority to JP2007523403A priority patent/JPWO2007004419A1/ja
Publication of WO2007004266A1 publication Critical patent/WO2007004266A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • 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
    • H01F38/30—Constructions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/56—Circuits for coupling, blocking, or by-passing of signals
    • 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
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/16—Toroidal transformers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462—Systems for power line communications
    • H04B2203/5483—Systems for power line communications using coupling circuits

Definitions

  • the present invention relates to a signal coupling device that superimposes a communication signal on a power transmission power line.
  • a PLC (Power Line Communication) system which is a power line carrier system, is a system that performs data communication by superimposing a high-frequency signal of 2MHz to 40MHz on a power line carrying power.
  • the signal coupling device in the PLC system performs a process of superimposing a communication signal transmitted from a communication device such as a modem on the power line or a process of extracting a communication signal superimposed on the power line. It is composed of an inductive coupling unit (IC U: Inductive Coupling Unit) that is a magnetic core.
  • IC U Inductive Coupling Unit
  • a power line is inserted into the opening of the magnetic core constituting the signal coupling device, and a signal line connected to a communication device such as a modem is wound around the contour of the magnetic core.
  • a communication device such as a modem
  • a gap is applied to a part of the contour of the magnetic core.
  • the gap force causes magnetic flux to leak to the outside of the magnetic core.
  • the magnetic core coupling efficiency decreases (for example, see Patent Document 1).
  • the sintered shape of the ferrite is increased, so that the internal characteristics of the ferrite are not stabilized, the magnetic characteristics of the ferrite core are reduced, or a large crack is formed in the ferrite core. May occur.
  • the magnetic properties of the ferrite core vary from one firing lot to another and become unstable, leading to a decrease in coupling efficiency of the signal coupling device and variations.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2002-270430 (the fourth page force is also the eighth page, Fig. 2)
  • the conventional signal coupling device is configured as described above, the saturation phenomenon of the magnetic core is prevented.
  • the gap cover is magnetically coupled. Since magnetic flux leaks to the outside of the core, there is a problem that the coupling efficiency is lowered unless the height of the magnetic core is increased.
  • the present invention has been made to solve the above-described problems, and provides a signal coupling device capable of preventing a decrease in coupling efficiency of a magnetic core without increasing the height of the magnetic core. With the goal.
  • a plurality of magnetic cores are installed in close contact so that the positions of the gaps are the same.
  • FIG. 1 is a perspective view showing a signal coupling device according to Embodiment 1 of the present invention.
  • FIG. 2 is an explanatory diagram showing magnetic flux leakage of the signal coupling device according to Embodiment 1 of the present invention.
  • FIG. 3 is a characteristic diagram showing the coupling efficiency of the signal coupling device according to the first embodiment of the present invention.
  • ⁇ 4] Shows the relationship between the magnetic core interval and the coupling efficiency of the signal coupling device according to the first embodiment of the present invention.
  • FIG. 5 is an explanatory diagram showing a flow of magnetic flux when gap positions of a plurality of magnetic cores are shifted.
  • FIG. 6 is a characteristic diagram showing the relationship between gap misalignment and coupling efficiency.
  • FIG. 7 is an explanatory view showing a magnetic core manufacturing method capable of eliminating gap misalignment without aligning a plurality of magnetic cores.
  • FIG. 8 is a perspective view showing a signal coupling device according to Embodiment 3 of the present invention.
  • FIG. 9 is a perspective view showing a signal coupling device according to Embodiment 6 of the present invention.
  • FIG. 10 is a perspective view showing a signal coupling device according to Embodiment 7 of the present invention.
  • FIG. 11 is a perspective view showing a signal coupling device according to an eighth embodiment of the present invention.
  • FIG. 12 is an explanatory view showing the arrangement of common gap members.
  • FIG. 13 is an explanatory view showing a common gap material.
  • FIG. 14 is a sectional view showing a signal coupling device according to Embodiment 10 of the present invention.
  • FIG. 15 is a sectional view showing a signal coupling device according to Embodiment 10 of the present invention.
  • FIG. 16 is an explanatory diagram showing a protection element of a signal coupling device according to Embodiment 11 of the present invention.
  • FIG. 17 is an explanatory view showing a spacer of the signal combining device according to the eleventh embodiment of the present invention.
  • FIG. 1 is a perspective view showing a signal coupling device according to Embodiment 1 of the present invention.
  • a power line 1 is a line that carries power transmitted from a distribution system.
  • the modem 2 is a communication device that transmits and receives communication signals, and a signal line 5 that carries the communication signals is connected to the connector 3.
  • the connector 3 is accommodated in the connector case 4 in order to protect the attachment portion of the signal line 5 to the modem 2.
  • the signal coupling device includes ring-shaped magnetic cores 7a and 7b, and superimposes a communication signal transmitted from the modem 2 on the power line 1 for power transfer, while superimposing it on the power line 1.
  • the communication signal is extracted and the communication signal is output to the modem 2.
  • the magnetic cores 7a and 7b are made of a magnetic material such as MnZn ferrite, NiZn ferrite, amorphous, permalloy, silicon steel plate, etc., and are in close contact with each other so that the gaps 10a and 10b are at the same position. is set up.
  • the openings 8 of the magnetic cores 7a and 7b are holes for inserting the power lines 1 for power transfer.
  • the signal line 5 is wound around the contour portions 9a and 9b of the magnetic cores 7a and 7b, and gaps 10a and 10b are provided on part of the contour portions 9a and 9b.
  • the number of turns of the signal wire 5 with respect to the contour portions 9a and 9b of the magnetic cores 7a and 7b is “1”, and the number of turns may be “2” or more. Yes.
  • the area 6 (the hatched portion in the figure) of the loop region by the signal line 5 is set to be larger than the cross-sectional area 11 of the contour portions 9a and 9b in the magnetic cores 7a and 7b.
  • FIG. 2 is an explanatory diagram showing magnetic flux leakage of the signal coupling device according to the first embodiment of the present invention
  • FIG. 3 is a characteristic diagram showing the coupling efficiency of the signal coupling device according to the first embodiment of the present invention. is there.
  • FIG. 4 is a characteristic diagram showing the relationship between the magnetic core spacing and the coupling efficiency of the signal coupling device according to Embodiment 1 of the present invention
  • FIG. 5 shows the magnetic flux when the gap positions of a plurality of magnetic cores are shifted. It is explanatory drawing which shows a flow.
  • the modem 2 transmits a communication signal
  • the communication signal is output to the signal line 5.
  • the communication signal output from the modem 2 is carried by the signal line 5, and when the communication signal reaches the magnetic cores 7a and 7b, it is superimposed on the power line 1 by the electromagnetic induction action of the magnetic cores 7a and 7b.
  • the communication signal output from the modem 2 is carried along with the power by the power line 1.
  • the communication signal is carried by the signal line 5 and received by the modem 2.
  • the forces in which the gaps 10a and 10b are applied to the contour portions 9a and 9b of the magnetic cores 7a and 7b in FIG. 1 are as shown in FIG. 2 (a).
  • the gaps 10a and 10b are not applied to the contour portions 9a and 9b, the magnetic flux flows only inside the magnetic cores 7a and 7b.
  • FIG. 3 shows the relationship between the coupling efficiency of the signal coupling device and the winding cross-sectional area (the area 6 of the loop region by the signal line 5).
  • the ratio of the area 6 of the loop region by the signal line 5 to the cross-sectional area 11 of the contour portions 9a and 9b is As it increases, the coupling efficiency increases.
  • the magnetic cores 7a and 7b are installed in close contact with each other so that the gaps 10a and 10b are at the same position.
  • the magnetic core is divided in the height direction and a plurality of low-profile magnetic cores 7a and 7b are overlapped to prevent a reduction in coupling efficiency without incurring high costs. Like you do.
  • the number of magnetic cores to be superimposed should be determined according to the required coupling efficiency. This makes it easy to manufacture according to the installation location of the signal coupling device.
  • the interval between the magnetic cores 7a and 7b is set to zero, high coupling efficiency can be obtained.
  • the positions of the gaps 10a and 10b of the magnetic cores 7a and 7b are If they are deviated, the magnetic flux generated by the current 12 flowing through the power line 1 does not link the gaps 10a and 10b. As a result, the magnetic cores 7a and 7b are saturated and the characteristics deteriorate due to this magnetic flux.
  • nonmagnetic materials such as plastic, Teflon (registered trademark), polycarbonate, and ABS are used.
  • FIG. 6 is a characteristic diagram showing the relationship between the positional deviation of the gaps 10a and 10b and the coupling efficiency.
  • the ratio between the gaps 10a and 10b and the gap length is used as the definition of the gaps 10a and 10b.
  • Fig. 6 (b) shows the case where the gaps 10a and 10b are displaced and the specific power of the gap length is '1'.
  • the ratio between the gaps 10a and 10b and the gap length is "0. If it is 3 "or less, the coupling efficiency is hardly attenuated.
  • one type of signal coupling device can be used to support the power line 1 with various current values. be able to.
  • the plurality of magnetic cores 7a and 7b are arranged in close contact so that the positions of the gaps 10a and 10b are the same. Therefore, there is an effect that a high coupling efficiency can be obtained without increasing the height of the magnetic cores 7a and 7b.
  • the magnetic cores 7a and 7b are composed of ferrite cores, it is possible to reduce the volume of the ferrite in the firing step at the time of producing the ferrite. As a result, the magnetic properties of the entire ferrite core can be improved and the magnetic properties can be stabilized. That is, it is possible to increase the coupling efficiency of the signal coupling device and perform stable data communication.
  • the ferrite core can be made smaller in shape, cracks and microcracks (small cracks with a gap of 1 mm or less) are almost never generated in the ferrite core, and partial discharge is unlikely to occur even when attached to a high-voltage power line. Thus, there is an effect that a signal coupling device having excellent insulation characteristics and reliability can be obtained.
  • the power line 1 since the ratio between the positional deviation of the gaps 10a and 10b in the plurality of magnetic cores 7a and 7b and the length of the gap is 0.3 or less, the power line 1 There is an effect that the decrease in the coupling efficiency due to the saturation of the magnetic core due to the current 12 flowing through can be made substantially zero.
  • the gaps 10a, 10b in the plurality of magnetic cores 7a, 7b Since the ratio between the misalignment and the gap length is 0.5 or less, the reduction in coupling efficiency due to the saturation of the magnetic core due to the current 12 flowing through the power line 1 affects the communication characteristics. There is an effect that can be suppressed to a certain extent. Further, even if the gap length manufacturing variation force S is present, it is possible to eliminate the decrease in coupling efficiency.
  • the power line 1 is allowed to flow.
  • the effect of reducing the decrease in coupling efficiency due to the saturation of the magnetic core due to the current 12 generated can be achieved.
  • the area 6 of the loop region formed by the signal line 5 wound around the contour portions 9a and 9b of the magnetic cores 7a and 7b is set to the contour portions 9a and 9b of the magnetic cores 7a and 7b. Since the cross-sectional area of the magnetic cores 7a and 7b is increased, the coupling efficiency of the magnetic cores 7a and 7b can be prevented from being lowered without increasing the height.
  • the ratio between the area 6 of the loop region by the signal line 5 and the cross-sectional area 11 of the contour portions 9a and 9b in the magnetic cores 7a and 7b is 1.5 or more. As a result, it is possible to obtain a high coupling efficiency.
  • the coupling efficiency does not change, and the variation in the characteristics of the signal coupling device can be reduced.
  • FIG. 7 is an explanatory view showing a manufacturing method of the magnetic cores 7a and 7b that can eliminate the positional deviation of the gaps 10a and 10b without aligning the magnetic cores 7a and 7b.
  • a manufacturing process for flattening the gap surface is provided after the magnetic cores 7a and 7b are bonded together.
  • the manufacturing process for flattening the gap surface may be polishing or grinding.
  • the signal coupling device is configured by using a plurality of magnetic cores 7a and 7b.
  • the signal coupling device is configured by using one magnetic core 7a. Even in this case, if the area 6 of the loop region by the signal line 5 wound around the contour portion 9a of the magnetic core 7a is made larger than the cross-sectional area 11 of the contour portion 9a of the magnetic core 7a, the first embodiment and Similarly, it is possible to prevent the coupling efficiency of the magnetic core 7a from being lowered without increasing the height of the magnetic core 7a.
  • the area 6 of the loop region by the signal line 5 wound around the contour portions 9a and 9b of the magnetic cores 7a and 7b is made larger than the cross-sectional area 11 of the contour portions 9a and 9b of the magnetic cores 7a and 7b.
  • the gaps 10a and 10b of the magnetic cores 7a and 7b are eliminated.
  • even if the area 6 of the loop region by the signal line 5 wound around the contours 9a and 9b of 7b is not larger than the cross-sectional area 11 of the contours 9a and 9b of the magnetic cores 7a and 7b.
  • the gap 10a, 1 Ob of force 3 or more shown in the case where the signal coupling device is configured using the magnetic cores 7a, 7b provided with the two gaps 10a, 10b is applied.
  • the signal coupling device may be configured using the magnetic cores 7a and 7b.
  • the signal coupling device may be configured using three or more magnetic cores.
  • the force shown for the winding force of the signal line 5 with respect to the contour portions 9a and 9b of the magnetic cores 7a and 7b is applied to the contour portions 9a and 9b of the magnetic cores 7a and 7b.
  • the number of turns of the signal line 5 to be performed may be “2” or more.
  • the magnetic cores 7a and 7b may be provided with ground terminals 12a and 12b.
  • FIG. 10 is a perspective view showing a signal carrying device according to Embodiment 7 of the present invention.
  • the same reference numerals as those in FIG. 10 are identical to FIG. 10 in the figure.
  • the reinforcing wires 13 are inserted into the openings 8 of the magnetic cores 7a and 7b, and both ends are connected to the connector case 4.
  • the reinforcing wire 13 is made of a metal or insulating wire, and the length of the reinforcing wire 13 is set so that the loop of the reinforcing wire 13 is smaller than the loop of the signal wire 5.
  • the force shown for the case where the signal line 5 connected to the modem 2 is wound around the ring portions 9a and 9b of the magnetic cores 7a and 7b. If the modem 2 or the magnetic cores 7a and 7b are mistakenly moved during installation of the combined device, a tensile load is applied to the signal line 5 and the signal line 5 may be disconnected.
  • the reinforcing wire 13 made of a metal or an insulating wire is inserted into the openings 8 of the magnetic cores 7a and 7b.
  • the length of the reinforcing wire 13 is set so that the loop of the reinforcing wire 13 is smaller than the loop of the signal wire 5 as described above.
  • the gaps 14 and 15 of the plurality of magnetic cores 7a and 7b may be configured by using a gap member common to the plurality of magnetic cores 7a and 7b.
  • the gap member common to the magnetic cores 7a and 7b may be a plate made of a magnetic material such as plastic, Teflon (registered trademark), polycarbonate, ABS, and the like. It may be attached to the gaps 14 and 15 of the magnetic cores 7a and 7b with an agent.
  • the magnetic cores 7a and 7b may be stretched on one side or both upper and lower sides.
  • the gap positions of the plurality of magnetic cores 7a and 7b can be aligned. it can.
  • the force shown in FIG. 13 is shown for forming gaps 14 and 15 by bonding a non-magnetic plate, which is a common gap material, to magnetic cores 7a and 7b.
  • the gap materials 16 and 17 may be covered with the magnetic cores 7a and 7b to form the gaps 14 and 15.
  • Such a cap may be provided on one side or both upper and lower sides of the magnetic cores 7a and 7b.
  • the magnetic cores 7a and 7b may be housed in a plastic or metal case 18!
  • an elastic member 20 such as a panel is attached to the case 18 so that the elastic member 20 presses the magnetic cores 7 a and 7 b against the reference surface 19 of the case 18.
  • a surge voltage from the power distribution system may be generated on the power line 1. Since the frequency of this surge voltage is almost the same as the frequency of the communication signal, it may enter the signal line 5 and damage the modem 2.
  • a protection element 21 that prevents destruction of the modem 2 due to a surge voltage is connected to the signal line 5.
  • the modem 2 connected to the signal line 5 can be protected even if a surge voltage is generated in the distribution system.
  • the protective element 21 is installed inside the connector case 4, and the protective element 21 is molded into the connector case 4 together with the connector 3.
  • a capacitor As the protective element 21, a capacitor, a surge arrester, a gas gap arrester, a parister, a diode, or the like is used. Any one element may be used, or various elements may be combined. Protective element 21 is installed between signal line 5 or between signal line 5 and ground
  • the thickness of the nonmagnetic spacer 22 is at least one half of the thickness of the gap material (gap length), it is possible to prevent a reduction in coupling efficiency.
  • the reason why the coupling efficiency can be prevented is that the magnetic flux generated by the current 12 flowing through the power line 1 passes through the nonmagnetic spacer 22 twice, as shown in FIG.
  • a plate made of a nonmagnetic material such as plastic, Teflon (registered trademark), polycarbonate, ABS or the like can be considered.
  • the magnetic cores 7a and 7b and the spacer 22 may be integrated to form a single unit, but may be prepared separately and stored in a case or the like to be fixed.
  • the nonmagnetic spacer 22 is inserted between the magnetic cores 7a and 7b, even if the gaps 10a and 10b are slightly misaligned, the coupling efficiency is prevented from being lowered. The effect which can be done is produced.
  • the signal coupling device superimposes the communication signal transmitted from the communication device on the power line when performing data communication or the like using the power carrier power line, It is suitable for extracting a communication signal superimposed on a power line.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

L'invention a trait à un coupleur de signal comprenant des centres magnétiques (7a, 7b) ; une ligne électrique (1) est insérée dans une ouverture (8), une ligne de signal (5) reliée à un modem (2) est enroulée autour des parties de contour (9a, 9b) et des intervalles (10a, 10b) sont prévus dans une partie du contour (9a, 9b). Puisque la pluralité des centres magnétiques (7a, 7b) est précisément positionnée de sorte que les intervalles (10a, 10b) soient situés à la même place, il est possible de parvenir à une forte efficacité de couplage sans augmenter la hauteur des centres magnétiques (7a, 7b).
PCT/JP2005/012118 2005-06-30 2005-06-30 Coupleur de signal WO2007004266A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/JP2005/012118 WO2007004266A1 (fr) 2005-06-30 2005-06-30 Coupleur de signal
PCT/JP2006/312353 WO2007004419A1 (fr) 2005-06-30 2006-06-20 Coupleur de signal
JP2007523403A JPWO2007004419A1 (ja) 2005-06-30 2006-06-20 信号結合装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2005/012118 WO2007004266A1 (fr) 2005-06-30 2005-06-30 Coupleur de signal

Publications (1)

Publication Number Publication Date
WO2007004266A1 true WO2007004266A1 (fr) 2007-01-11

Family

ID=37604146

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/JP2005/012118 WO2007004266A1 (fr) 2005-06-30 2005-06-30 Coupleur de signal
PCT/JP2006/312353 WO2007004419A1 (fr) 2005-06-30 2006-06-20 Coupleur de signal

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/JP2006/312353 WO2007004419A1 (fr) 2005-06-30 2006-06-20 Coupleur de signal

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JP (1) JPWO2007004419A1 (fr)
WO (2) WO2007004266A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4834881B2 (ja) * 2007-06-27 2011-12-14 ネッツエスアイ東洋株式会社 電力線通信システム用結合器、結合器の組付け構造及び電力線通信システム
JP7368091B2 (ja) * 2019-03-18 2023-10-24 矢崎総業株式会社 サージ低減装置、ワイヤハーネス及びコア間連結構造体

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57196513A (en) * 1981-05-28 1982-12-02 Tamura Seisakusho Co Ltd Choke coil of switching regulator or the like
JP2003517196A (ja) * 1999-12-16 2003-05-20 ハネウェル・インターナショナル・インコーポレーテッド インダクタのコア・コイル・アセンブリおよびその製造
WO2003094365A2 (fr) * 2002-05-03 2003-11-13 Ambient Corporation Construction de coupleurs de donnees de ligne electrique de moyenne tension
WO2004112274A1 (fr) * 2003-06-17 2004-12-23 Sumitomo Electric Industries, Ltd. Dispositif de remplissage/extraction de signal

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5914326U (ja) * 1982-07-19 1984-01-28 株式会社電機精工社 直流リアクトル
JPH01281713A (ja) * 1988-05-09 1989-11-13 Fujitsu Ltd トランス
JPH0341910U (fr) * 1989-08-31 1991-04-22
JPH062638U (ja) * 1992-06-18 1994-01-14 スタンレー電気株式会社 ノイズフィルタ用チョークコイル
JPH0620844A (ja) * 1992-06-30 1994-01-28 Matsushita Electric Ind Co Ltd インダクタンス部品
JP3626945B2 (ja) * 2002-07-15 2005-03-09 北川工業株式会社 雑音電流吸収具

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57196513A (en) * 1981-05-28 1982-12-02 Tamura Seisakusho Co Ltd Choke coil of switching regulator or the like
JP2003517196A (ja) * 1999-12-16 2003-05-20 ハネウェル・インターナショナル・インコーポレーテッド インダクタのコア・コイル・アセンブリおよびその製造
WO2003094365A2 (fr) * 2002-05-03 2003-11-13 Ambient Corporation Construction de coupleurs de donnees de ligne electrique de moyenne tension
WO2004112274A1 (fr) * 2003-06-17 2004-12-23 Sumitomo Electric Industries, Ltd. Dispositif de remplissage/extraction de signal

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JPWO2007004419A1 (ja) 2009-01-22
WO2007004419A1 (fr) 2007-01-11

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