WO2016170708A1 - Carte de circuit imprimé et circuit de filtrage l'utilisant - Google Patents

Carte de circuit imprimé et circuit de filtrage l'utilisant Download PDF

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Publication number
WO2016170708A1
WO2016170708A1 PCT/JP2015/084312 JP2015084312W WO2016170708A1 WO 2016170708 A1 WO2016170708 A1 WO 2016170708A1 JP 2015084312 W JP2015084312 W JP 2015084312W WO 2016170708 A1 WO2016170708 A1 WO 2016170708A1
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WO
WIPO (PCT)
Prior art keywords
inductor
filter circuit
circuit
circuit board
inductance element
Prior art date
Application number
PCT/JP2015/084312
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English (en)
Japanese (ja)
Inventor
淳 東條
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株式会社村田製作所
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 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2016170708A1 publication Critical patent/WO2016170708A1/fr

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    • 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
    • H03H7/075—Ladder networks, e.g. electric wave filters
    • 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

  • the present invention by adopting a circuit configuration in which two capacitor elements can be mounted, the influence of the parasitic resistance of the capacitance element on the noise suppression effect is suppressed, and the parasitic capacitance of the capacitance element is reduced using the negative inductance component of the inductance element.
  • a circuit board capable of suppressing the influence of inductance on the noise suppression effect.
  • a noise suppression effect can be improved by mounting a capacitor element on the circuit board to form a filter circuit.
  • 1 is a circuit diagram of a filter circuit according to a first embodiment of the present invention. It is a circuit diagram which shows the equivalent circuit of a 3rd-order T-type LC filter circuit, and a graph which shows the transmission characteristic with respect to the frequency of this circuit diagram. 4 is a circuit diagram showing an equivalent circuit of a third-order T-type LC filter circuit when the parasitic resistance of the capacitor is large, and a graph showing transmission characteristics with respect to frequency in this circuit diagram. It is a circuit diagram which shows the equivalent circuit of a 5th-order T type
  • 4 is a circuit diagram showing an equivalent circuit of a fifth-order T-type LC filter circuit having a coupling coefficient K16 of 10%, and a graph showing transmission characteristics with respect to frequency in this circuit diagram. It is a graph which shows the transmission characteristic with respect to the frequency of a filter circuit whose coupling coefficient K16 is 1% and 0.1%.
  • FIG. 1 is a circuit diagram of a filter circuit 1 according to Embodiment 1 of the present invention.
  • Filter circuit 1 is, for example, an EMI removal filter, and is a fifth-order T-type LC filter circuit. As shown in FIG. 1, the filter circuit 1 includes a capacitor C1 (first capacitance element), a capacitor C2 (second capacitance element), an electrode T1 (first electrode), an inductor L1 (first inductance element), and an inductor L2 ( A first inductance part), an inductor L3 (second part of the second inductance element), an electrode T2 (second electrode), and an inductor L6 (third inductance element).
  • the capacitor C1 has one terminal connected to the electrode T1 and the other terminal connected to the ground electrode GND3.
  • the capacitor C1 has an inductor L4 as a parasitic inductance (equivalent series inductance (ESL)) and a resistor R1 as a parasitic resistance (equivalent series resistance (ESR)).
  • the inductor L4 and the resistor R1 are in series with the capacitor C1a. It is equivalent to the connected circuit configuration.
  • an inductor L1 and an inductor L2 are connected to the electrode T1.
  • the inductor L1 and the inductor L2 are tightly coupled, and a pseudo negative inductance component is generated.
  • This negative inductance component can cancel the parasitic inductance of the capacitor C1 (inductor L4), and the inductance component of the capacitor C1 can be apparently reduced.
  • the filter circuit has a parasitic inductance (inductor L4) due to a negative inductance component between the inductor L1 and the inductor L2.
  • the capacitor C2 has one terminal connected to the electrode T2 and the other terminal connected to the ground electrode GND4.
  • the capacitor C2 has an inductor L5 as a parasitic inductance and a resistor R2 as a parasitic resistance, and is equivalent to a circuit configuration in which the inductor L5 and the resistor R2 are connected in series to the capacitor C2a.
  • an inductor L3 and an inductor L6 are connected to the electrode T2.
  • the inductor L3 and the inductor L6 are tightly coupled, and a pseudo negative inductance component is generated. This negative inductance component can cancel the parasitic inductance of the capacitor C2 (inductor L5), and the inductance component of the capacitor C2 can be apparently reduced.
  • the filter circuit When a circuit composed of the capacitor C2, the inductor L3, and the inductor L6 is considered as a third-order T-type LC filter circuit, the filter circuit has a parasitic inductance (inductor L5) due to a negative inductance component between the inductor L3 and the inductor L6. By canceling out, the noise suppression effect in the high frequency band is improved.
  • FIG. 2 is a circuit diagram showing an equivalent circuit of a third-order T-type LC filter circuit, and a graph showing transmission characteristics with respect to frequency in this circuit diagram.
  • a filter circuit 1a illustrated in FIG. 2A is a third-order T-type LC filter circuit including a capacitor C1, an inductor L1, and an inductor L2.
  • the capacitor C1 sets the capacitor C1a as 0.1 ⁇ F, the inductor L4 as 1 nH, and the resistor R1 as 0.01 ⁇ .
  • the inductors L1 and L2 are set to 2 nH, respectively.
  • the coupling coefficient K12 between the inductor L1 and the inductor L2 is set to 0.5 (50%).
  • the filter circuit 1a cancels the 1 nH parasitic inductance of the inductor L4 with a negative inductance component ( ⁇ 1 nH) generated by coupling the 2 nH inductors L1 and L2 at 50%.
  • FIG. 2B is a graph showing the result of performing circuit simulation on the filter circuit 1a shown in FIG. 2A and showing the transmission characteristics with respect to the frequency.
  • the horizontal axis is the frequency Freq (MHz)
  • the vertical axis is the transmission characteristic S (dB).
  • the filter circuit 1a has a reduced transmission characteristic S at a frequency Freq of 1.0 MHz or higher, and can improve the noise suppression effect in the high frequency band.
  • FIG. 3B is a graph showing a result of performing circuit simulation on the filter circuit 1a shown in FIG. 3A and showing transmission characteristics with respect to frequency.
  • the filter circuit 1a has the transmission characteristic S reduced at a frequency Freq of 1.0 MHz or higher, but the noise suppression effect in the high-frequency band as compared with the graph shown in FIG. 2 (b). Can not be improved sufficiently.
  • the filter circuit 1a where the parasitic resistance (resistor R1) of the capacitor C1 is large the influence of the impedance of the parasitic resistance increases at frequencies after the self-resonance frequency, and the contribution ratio of the dielectric loss of the capacitor C1 increases according to the frequency. For this reason, the filter circuit 1a having a large parasitic resistance (resistor R1) of the capacitor C1 cannot sufficiently improve the noise suppression effect in the high frequency band only by canceling the parasitic inductance with a negative inductance component.
  • the filter circuit 1a has a small parasitic resistance and a negative parasitic inductance. By canceling out with the inductance component, it is possible to improve the noise suppression effect in the high frequency band.
  • the parasitic resistance of the capacitor C1 increases in the filter circuit 1a. Therefore, simply canceling the parasitic inductance with a negative inductance component causes noise in the high frequency band. The suppression effect cannot be improved sufficiently.
  • the circuit simulation is performed with the coupling coefficient K16 between the inductor L1 and the inductor L6 set to 0.0 (0%).
  • the coupling coefficient K16 between the inductor L1 and the inductor L6 cannot be sufficiently separated so as to be 0%, the coupling coefficient K16 has some value.
  • the inductor L1 and the inductor L2 shown in FIG. 1 are marked with a circle indicating the beginning of winding on the left side of the coil, while the inductor L3 and the inductor L6 are marked with a circle indicating the beginning of winding on the right side of the coil. . This indicates that the winding directions of the inductors L1 and L2 are different from the winding directions of the inductors L3 and L6.
  • FIG. 8 is a perspective view of the filter circuit 1 according to Embodiment 1 of the present invention.
  • FIG. 9 is a plan view and a cross-sectional view of the filter circuit 1 according to Embodiment 1 of the present invention.
  • the filter circuit 1 includes a circuit board 2, a capacitor C ⁇ b> 1 and a capacitor C ⁇ b> 2 mounted on the circuit board 2.
  • a capacitor C1 and a capacitor C2 are mounted in parallel to the circuit board 2, as shown in FIG.
  • Electrode T1 and electrode T2 are formed on the surface of circuit board 2 on which capacitors C1 and C2 are mounted.
  • the coil-shaped wiring patterns of the inductor L2 and the inductor L3 are formed continuously as shown in FIG. 9A and can be considered as one inductance element. That is, the left half of the drawing of one inductance element (the first portion of the second inductance element) functions as the inductor L2, and the right half of the drawing of one inductance element (the second portion of the second inductance element) is the inductor L3. Is functioning as Thereby, the manufacturing cost of the inductor L2 and the inductor L3 can be reduced. Of course, the inductor L2 and the inductor L3 may be manufactured separately.
  • the inductors L1 to L3 and L6 have substantially the same coil size, and the inductors L1 and L2 connected to the capacitor C1 and the inductors L3 and L6 connected to the capacitor C2 are substantially rotationally symmetric. Yes.
  • a compact filter circuit 1 can be manufactured by overlapping a plurality of inductors in the normal direction of the surface on which the capacitor C1 is mounted.
  • FIG. 10 is a graph showing transmission characteristics with respect to frequency of the filter circuit 1 according to Embodiment 1 of the present invention.
  • a graph (with a circuit board) showing the transmission characteristics with respect to the frequency of the filter circuit 1 in which the capacitors C1 and C2 are mounted on the circuit board 2a, and the transmission characteristics with respect to the frequency of the filter circuit consisting only of the capacitors C1 and C2.
  • a graph (without a circuit board) is shown.
  • the filter circuit 1 can sufficiently improve the noise suppression effect in the high frequency band by reducing the transmission characteristic S at the frequency Freq up to about 600.0 MHz as compared with the case without the circuit board.
  • the winding characteristics of the inductor L1 and the winding direction of the inductor L6 are made different so that the transmission characteristics S in a band similar to the circuit configuration when the coupling coefficient K16 is 1% in the circuit simulation result.
  • the noise suppression effect in the high frequency band can be improved.
  • the two capacitors C1 and C2 are mounted on the circuit board 2 to form the fifth-order T-type LC filter circuit, and the winding direction of the inductor L1 By making the winding direction of the inductor L6 different, the noise suppression effect in the high frequency band can be improved.
  • the capacitors C1 and C2 have been described as multilayer ceramic capacitors, not only multilayer ceramic capacitors mainly composed of BaTiO3 (barium titanate) but also multilayer ceramic capacitors mainly composed of other materials may be used. Furthermore, the capacitors C1 and C2 are not limited to multilayer ceramic capacitors, and may be other types of capacitors such as aluminum electrolytic capacitors. (Embodiment 2) In the first embodiment of the present invention, as shown in FIG. 9A, the inductors L1 to L3 and L6 formed on the circuit board 2 have almost the same coil size.
  • FIG. 11 is a plan view of a circuit board according to Embodiment 2 of the present invention, and a graph showing transmission characteristics with respect to frequency of a filter circuit using the circuit board.
  • the coil shape formed by the wiring pattern of the inductor L1a is smaller than the coil shape formed by the wiring pattern of the inductor L2.
  • the winding directions of the inductors L1a and L2 are the same counterclockwise.
  • the coil shape formed by the wiring pattern of the inductor L6a is smaller than the coil shape formed by the wiring pattern of the inductor L3. Note that the winding directions of the inductors L3 and L6a are the same clockwise.
  • the coupling coefficient K12a between the inductor L1a and the inductor L2 changes compared to the coupling coefficient K12 between the inductor L1 and the inductor L2 shown in FIG. Therefore, the negative inductance component generated by the coupling between the inductor L1a and the inductor L2 is also changed.
  • the inductors L1a and L2 connected to the capacitor C1 and the inductors L3 and L6a connected to the capacitor C2 have a substantially rotationally symmetric shape.
  • the inductance component is also changed.
  • FIG. 11B a graph (with a circuit board) showing transmission characteristics with respect to the frequency of the filter circuit in which the capacitors C1 and C2 are mounted on the circuit board 2a, and the frequency of the filter circuit consisting only of the capacitors C1 and C2 A graph (without circuit board) showing transmission characteristics is shown.
  • the filter circuit using the circuit board 2a can sufficiently improve the noise suppression effect in the high frequency band by reducing the transmission characteristic S at a frequency Freq of 1.0 MHz or higher compared to the case without the circuit board. That is, even if the circuit board 2a is a filter circuit, the transmission characteristic S can be reduced and the noise suppression effect in the high frequency band can be sufficiently improved as in the filter circuit 1 shown in FIG. As shown in FIG.
  • FIG. 12 is a plan view of a modification of the circuit board according to Embodiment 2 of the present invention.
  • the size of the coils of the inductors L1 and L2 is almost the same as the size of the coil shown in FIG. 9A, but compared with the size of the coils of the inductors L3 and L6.
  • the size of the coils of the inductors L3b and L6b is small.
  • the coil size of the inductor L3b and the coil size of the inductor L6b are substantially the same size.

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Abstract

La présente invention porte sur une carte de circuit imprimé (2) qui possède un premier et un second élément de capacité (condensateurs C1, C2) montés sur celle-ci, et qui est pourvue d'une première électrode (électrode T1), d'un premier élément d'inductance (bobine d'inductance L1), de deuxièmes éléments d'inductance (bobines d'inductance L2, L3), d'une seconde électrode (électrode T2) et d'un troisième élément d'inductance (bobine d'inductance L6). Au moins les directions d'enroulement du premier élément d'inductance (bobine d'inductance L1) et de la première section de deuxième élément d'inductance (bobine d'inductance L2) sont identiques, et celles du troisième élément d'inductance (bobine d'inductance L6) et de la seconde section de deuxième élément d'inductance (bobine d'inductance L3) sont identiques.
PCT/JP2015/084312 2015-04-20 2015-12-07 Carte de circuit imprimé et circuit de filtrage l'utilisant WO2016170708A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-086055 2015-04-20
JP2015086055 2015-04-20

Publications (1)

Publication Number Publication Date
WO2016170708A1 true WO2016170708A1 (fr) 2016-10-27

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PCT/JP2015/084312 WO2016170708A1 (fr) 2015-04-20 2015-12-07 Carte de circuit imprimé et circuit de filtrage l'utilisant

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022070888A1 (fr) * 2020-10-01 2022-04-07 株式会社村田製作所 Composant bobine, circuit filtre le contenant, et dispositif électronique
US11451319B2 (en) 2019-11-25 2022-09-20 Murata Manufacturing Co., Ltd. High-frequency signal transmission-reception circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56128007A (en) * 1980-03-11 1981-10-07 Nec Corp Low-pass filter
JPH08250962A (ja) * 1995-03-10 1996-09-27 Tdk Corp Ｌｃフィルタ
JP2007202380A (ja) * 2005-07-04 2007-08-09 Tdk Corp サージ吸収素子

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56128007A (en) * 1980-03-11 1981-10-07 Nec Corp Low-pass filter
JPH08250962A (ja) * 1995-03-10 1996-09-27 Tdk Corp Ｌｃフィルタ
JP2007202380A (ja) * 2005-07-04 2007-08-09 Tdk Corp サージ吸収素子

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11451319B2 (en) 2019-11-25 2022-09-20 Murata Manufacturing Co., Ltd. High-frequency signal transmission-reception circuit
WO2022070888A1 (fr) * 2020-10-01 2022-04-07 株式会社村田製作所 Composant bobine, circuit filtre le contenant, et dispositif électronique
JP7107463B1 (ja) * 2020-10-01 2022-07-27 株式会社村田製作所 電子機器

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