Noise filters and electrical and electronic equipment

Abstract

The noise filter is constructed to include: a magnetic core (11) including a magnetic body; and a distance adjustment component that adjusts the distance between a portion of one or more conductor wirings of a first conductor wiring (6) and a second conductor wiring (9) that is wired in a ring shape, i.e., a ring portion, and the magnetic core (11).

Description

Technical Field

[0001] The present invention relates to a noise filter including a conductor wiring wired in a loop shape, and an electric or electronic device including the noise filter. Background Art

[0002] An electrical and electronic device may include a noise filter that suppresses electromagnetic noise generated from a first circuit mounted on a printed circuit board from being transmitted to a second circuit mounted on the printed circuit board.

[0003] In an electrical electronic device including a power pattern connecting a first circuit and a second circuit and a ground pattern connecting the first circuit and the second circuit, a capacitor is known as a noise filter connected between the power pattern and the ground pattern.

[0004] The capacitor bypasses electromagnetic noise propagating in the power pattern to the ground pattern, thereby preventing electromagnetic noise generated in the first circuit from being propagated to the second circuit via the power pattern.

[0005] However, the capacitor includes an inductance component. In addition, the lead connecting the capacitor and the power pattern and the lead connecting the capacitor and the ground pattern also include an inductance component.

[0006] The inductance component included in the capacitor or the like reduces the bypass performance for the high-frequency component included in the electromagnetic noise, so that the transmission of the high-frequency component of the electromagnetic noise may not be suppressed.

[0007] Patent Document 1 listed below discloses a noise filter capable of suppressing the transmission of high-frequency components of electromagnetic noise.

[0008] The noise filter disclosed in Patent Document 1 includes the following components (1) to (3).

[0009] (1) A ring-shaped conductor wiring having one end connected to the second circuit

[0010] The loop-shaped conductor wiring corresponds to the first reactor wired on the first conductor layer of the printed circuit board.

[0011] (2) A loop-shaped conductor wiring having one end connected to the first circuit and the other end connected to the other end of the first reactor

[0012] The loop-shaped conductor wiring corresponds to the second reactor wired on the second conductor layer of the printed circuit board.

[0013] (3) A capacitor having one end connected to the other end of the first reactor and the other end connected to the ground layer which is the third conductor layer of the printed circuit board

[0014] The first reactor and the second reactor are arranged on the same axis and share a magnetic flux formed by the current output from the first circuit. Therefore, the first reactor and the second reactor are magnetically coupled via the mutual inductance M.

[0015] The mutual inductance M plays a role in reducing the inductance component included in the capacitor and the like, thereby improving the effect of suppressing the high-frequency component of electromagnetic noise.

[0016] Prior art literature

[0017] Patent Literature

[0018] Patent Document 1: Japanese Patent Application Publication No. 2016-031965 Summary of the invention

[0019] The noise filter disclosed in Patent Document 1 reduces the inductance component included in the capacitor and the like by using the first reactor and the second reactor, and thus can enhance the effect of suppressing the high-frequency component of electromagnetic noise.

[0020] When designing the printed circuit board, as the first reactor and the second reactor, reactors having inductances capable of canceling out inductance components included in the capacitor and the like are selected.

[0021] However, due to the influence of dimensional tolerance or variation during substrate manufacturing, the inductance component included in the capacitor or the like may not be offset by the selected first reactor and second reactor.

[0022] When the inductance component included in the capacitor and the like cannot be offset by the selected first reactor and second reactor, there is a problem that the printed circuit board may need to be redesigned and remanufactured.

[0023] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a noise filter and an electrical and electronic device capable of improving the effect of suppressing high-frequency components of electromagnetic noise without redesigning and remanufacturing a printed circuit board.

[0024] The noise filter of the present invention comprises: a grounding wire connected between a first circuit and a second circuit, the first circuit being mounted on a first conductor layer in a substrate, and the second circuit being mounted on the first conductor layer; a capacitor having one end connected to the grounding wire; a first conductor wiring connected between the other end of the capacitor and the second circuit, and being wired in a ring shape in the first conductor layer; a second conductor wiring connected between the first circuit and the other end of the capacitor, and being wired in a ring shape in the second conductor layer in the substrate, and being magnetically coupled with the first conductor wiring; a magnetic core including a magnetic body; and a distance adjusting member receiving adjustment of the distance between the magnetic core and a portion of one or more conductor wirings wired in a ring shape, i.e., a ring portion, of the first conductor wiring and the second conductor wiring, and receiving movement of the magnetic core in a horizontal direction of the first conductor layer or a horizontal direction of the second conductor layer.

[0025] According to the present invention, the noise filter is configured to include: a magnetic core including a magnetic body; and a distance adjustment member that receives adjustment of the distance between the portion of the first conductor wiring and the second conductor wiring that is wired in a ring shape, that is, the ring portion, and the magnetic core, and the distance adjustment member receives movement of the magnetic core in the horizontal direction of the first conductor layer or the horizontal direction of the second conductor layer. Therefore, the noise filter involved in the present invention can improve the suppression effect of the high-frequency component of electromagnetic noise without redesigning and remanufacturing the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a perspective view showing an electric and electronic device including a noise filter according to the first embodiment.

[0027] Figure 2 It is shown Figure 1 FIG. 2 is a plan view of a first conductor layer 1 a in a printed circuit board 1 of an electric or electronic device.

[0028] Figure 3 It is shown Figure 1 FIG. 2 is a plan view of a second conductor layer 1 b in a printed circuit board 1 of an electrical or electronic device.

[0029] Figure 4 The figure shows a state where the magnetic core 11 is away from the annular portion 6a of the first conductor layer 1a. Figure 2 as well as Figure 3 A cross-sectional view of the A-A' section.

[0030] Figure 5 The figure shows the state where the magnetic core 11 is close to the annular portion 6a of the first conductor layer 1a. Figure 2 as well as Figure 3 A cross-sectional view of the A-A' section.

[0031] Figure 6This is a circuit diagram of a portion from the input / output terminal 2 a of the first circuit 2 to the input / output terminal 3 a of the second circuit 3 .

[0032] Figure 7 This is a circuit diagram in which the portion 20 including the first reactor and the second reactor is converted into an equivalent circuit.

[0033] Fig. 8A is an explanatory diagram showing the relationship between the position of the magnetic core 11 and the mutual inductance M. Figure 8B is an explanatory diagram showing the frequency characteristics of the mutual inductance M and the noise suppression effect, Figure 8C It is an explanatory diagram showing the relationship between the position of the magnetic core 11 and the noise suppression effect of high-frequency components.

[0034] Fig. 9 It is shown Figure 2 as well as Figure 3 A cross-sectional view of the A-A' section.

[0035] Fig.10 It is shown Figure 2 as well as Figure 3 A cross-sectional view of the A-A' section.

[0036] Fig.11 This is a plan view showing a first conductor layer 1 a in a printed circuit board 1 of an electric or electronic device according to a second embodiment.

[0037] Fig.12 This is a plan view showing the second conductor layer 1 b in the printed circuit board 1 of the electric and electronic device according to the second embodiment.

[0038] Fig.13 The diagram shows a state in which the magnetic core 31 is not arranged inside the annular portion 6a when the electric and electronic device is viewed from the z direction. Fig.11 as well as Fig.12 Cross-sectional view of the B-B' section.

[0039] Fig.14 The diagram shows a state in which the magnetic core 31 is arranged inside the annular portion 6a when the electric and electronic device is viewed from the z direction. Fig.11 as well as Fig.12 Cross-sectional view of the B-B' section.

[0040] Fig.15 It is a cross-sectional view of the electric and electronic device according to the third embodiment in a state where the magnetic core 11 is separated from the annular portion 9a of the second conductor layer 1b.

[0041] Fig.16 It is a cross-sectional view of the electric and electronic device according to the third embodiment in a state where the magnetic core 11 is close to the annular portion 9a of the second conductor layer 1b.

[0042] Fig.17 It is a cross-sectional view of the electric and electronic device according to the fourth embodiment in a state where the magnetic core 51 is separated from the annular portion 6 a of the first conductive layer 1 a .

[0043] Fig.18 It is a cross-sectional view of the electric and electronic device according to the fourth embodiment in a state where the magnetic core 51 is close to the annular portion 6 a of the first conductor layer 1 a .

[0044] (Explanation of symbols)

[0045] 1: printed circuit board; 1a: first conductor layer; 1b: second conductor layer; 1c: insulating layer; 2: first circuit; 2a: input / output terminal; 3: second circuit; 3a: input / output terminal; 4: ground wire; 5: capacitor; 5a, 5b: lead wire; 6: first conductor wiring; 6a: ring portion; 7: conductor wiring; 8: connecting conductor; 9: second conductor wiring; 9a: ring portion; 10: connecting conductor; 11: magnetic core; 11a: external thread; 11b: recess; 11c: convex portion; 12: slit (distance adjustment component); 13: core support component (distance adjustment component) 13a: through hole; 13b: internal thread; 14: fixing pin; 20: portion including the first inductor and the second inductor; 31: magnetic core; 31a: external thread; 32: slit (distance adjusting component); 33: core supporting component (distance adjusting component); 33a: through hole; 33b: internal thread; 40: through hole (distance adjusting component); 40a: internal thread (distance adjusting component); 51: magnetic core; 51a: external thread; 52: slit (distance adjusting component); 53: frame (distance adjusting component); 54: through hole; 54a: internal thread. DETAILED DESCRIPTION

[0046] In order to explain the present invention in more detail, specific embodiments will be described below with reference to the accompanying drawings.

[0047] Implementation method 1.

[0048] Figure 1 This is a perspective view showing an electric and electronic device including a noise filter according to the first embodiment.

[0049] Figure 2 It is shown Figure 1 FIG. 2 is a plan view of a first conductor layer 1 a in a printed circuit board 1 of an electric or electronic device.

[0050] Figure 3 It is shown Figure 1 FIG. 2 is a plan view of a second conductor layer 1 b in a printed circuit board 1 of an electrical or electronic device.

[0051] Figure 4The figure shows a state where the magnetic core 11 is away from the annular portion 6a of the first conductor layer 1a. Figure 2 as well as Figure 3 A cross-sectional view of the A-A' section.

[0052] Figure 5 The figure shows the state where the magnetic core 11 is close to the annular portion 6a of the first conductor layer 1a. Figure 2 as well as Figure 3 A cross-sectional view of the A-A' section.

[0053] exist Figures 1 to 5 , the z direction is a direction perpendicular to the first conductor layer 1a and the second conductor layer 1b, the x direction is a horizontal direction in the first conductor layer 1a and the second conductor layer 1b, and the y direction is a direction perpendicular to the z direction and the x direction.

[0054] The printed circuit board 1 is a multilayer board including a first conductor layer 1 a and a second conductor layer 1 b .

[0055] 1c is the insulating layer of the printed circuit board 1. Figures 1 to 3 The record is omitted.

[0056] The first circuit 2 is a circuit mounted on the first conductor layer 1 a of the printed circuit board 1 .

[0057] The second circuit 3 is a circuit mounted on the first conductor layer 1 a of the printed circuit board 1 .

[0058] One end of the ground line 4 is connected to the first circuit 2 , and the other end is connected to the second circuit 3 .

[0059] One end of the capacitor 5 is connected to the ground line 4 , and the other end is connected to one end of the first conductor wiring 6 and the other end of the connection conductor 10 , respectively.

[0060] The lead wire 5 a is a lead wire of the capacitor 5 to the ground wire 4 .

[0061] The lead wire 5 b is a lead wire for connecting the capacitor 5 to the connection point between the first conductor wiring 6 and the connection conductor 10 .

[0062] One end of the first conductor wiring 6 is connected to the other end of the capacitor 5 and the other end of the connection conductor 10 , respectively, and the other end is connected to the input / output terminal 3 a of the second circuit 3 .

[0063] The first conductor wiring 6 is wired on the first conductor layer 1a. A portion of the first conductor wiring 6 is wired in a loop shape, and the loop portion 6a, which is the loop-shaped portion of the first conductor wiring 6, functions as a first reactor.

[0064] One end of the conductor wiring 7 is connected to the input / output terminal 2 a of the first circuit 2 , and the other end is connected to one end of the connection conductor 8 .

[0065] The connection conductor 8 is a via having one end connected to the other end of the conductor wiring 7 and the other end connected to one end of the second conductor wiring 9 .

[0066] One end of the second conductor wiring 9 is connected to the other end of the connection conductor 8 , and the other end is connected to one end of the connection conductor 10 .

[0067] The second conductor wiring 9 is wired on the second conductor layer 1b. A portion of the second conductor wiring 9 is wired in a loop shape, and the loop portion 9a, which is the looped portion of the second conductor wiring 9, functions as a second reactor.

[0068] Regarding the annular portion 6a and the annular portion 9a, the conductor wiring is wound in the same direction and arranged on the same axis.

[0069] The first reactor and the second reactor are magnetically coupled via mutual inductance M.

[0070] The connection conductor 10 is a via having one end connected to the other end of the second conductor wiring 9 and the other end connected to the other end of the capacitor 5 and one end of the first conductor wiring 6 , respectively.

[0071] The conductor wiring 7 , the connection conductor 8 , the second conductor wiring 9 , the connection conductor 10 , and the first conductor wiring 6 constitute a power supply pattern that connects the first circuit 2 and the second circuit 3 .

[0072] The magnetic core 11 is a member including a magnetic body that affects the magnitude of the magnetic field coupling between the first conductor wiring 6 and the second conductor wiring 9 .

[0073] Figure 1 The illustrated electric and electronic device includes a distance adjusting member that adjusts the distance between the annular portion 6 a and the magnetic core 11 , and the distance adjusting member includes a slit 12 and a core supporting member 13 .

[0074] The slit 12 is formed at the end portion of the magnetic core 11 on the +z direction side.

[0075] The shape of the slit 12 is a shape that matches a slotted screw driver or the like, and the slotted screw driver or the like can be inserted into the slit 12 .

[0076] The core supporting member 13 is a non-magnetic member provided in a region inside the annular portion 6 a in a plane on the +z direction side of the first conductive layer 1 a .

[0077] The core supporting member 13 has a through hole 13 a formed therein for inserting the magnetic core 11 , and supports the magnetic core 11 inserted into the through hole 13 a .

[0078] Figure 1The core support member 13 of the electric and electronic device shown is provided on the plane on the +z direction side of the first conductor layer 1a. However, this is only an example, and the core support member 13 may be provided in the region inside the annular portion 9a on the plane on the -z direction side of the second conductor layer 1b.

[0079] The magnetic core 11 and the core support member 13 form threads that mesh with each other.

[0080] A male thread 11 a is formed on the side surface of the magnetic core 11 , and a female thread 13 b engaging with the male thread 11 a is formed in the through hole 13 a of the core support member 13 .

[0081] When the user rotates the magnetic core 11 by rotating a slotted screwdriver or the like inserted into the slit 12 , the magnetic core 11 moves in the z direction due to the action of the screw thread.

[0082] The movement of the magnetic core 11 in the +z direction is the movement of the magnetic core 11 away from the annular portion 6 a , and the movement of the magnetic core 11 in the −z direction is the movement of the magnetic core 11 toward the annular portion 6 a .

[0083] The fixing pins 14 are pins for fixing the core supporting member 13 to the printed circuit board 1 .

[0084] Figure 6 This is a circuit diagram of a portion from the input / output terminal 2 a of the first circuit 2 to the input / output terminal 3 a of the second circuit 3 .

[0085] Next, refer to Figure 6 , instructions are included in Figure 1 The operation of the noise filter in the electrical and electronic equipment shown.

[0086] The noise filter is provided on the printed circuit board 1 in order to prevent electromagnetic noise generated from the first circuit 2 from being transmitted to the second circuit 3 and electromagnetic noise generated from the second circuit 3 from being transmitted to the first circuit 2 .

[0087] The capacitor 5 of the noise filter bypasses the electromagnetic noise generated from the first circuit 2 or the electromagnetic noise generated from the second circuit 3 to the ground line 4 , thereby preventing the electromagnetic noise from being transmitted to the second circuit 3 or the first circuit 2 via the power supply pattern.

[0088] Capacitor 5 Figure 6 As shown, in addition to the electrostatic capacitance C, it also has an inductance Lc.

[0089] Lead 5a and lead 5b also have inductance. Figure 6 In FIG. 5 , L_line represents the sum of the inductance of lead 5 a and the inductance of lead 5 b.

[0090] Since the inductance Lc and the inductance L_line are connected in series, the following description will be given assuming that the total of the inductance Lc and the inductance L_line is the ESL.

[0091] The annular portion 6a functioning as the first reactor has a self-inductance L1, and the annular portion 9a functioning as the second reactor has a self-inductance L2.

[0092] The first reactor and the second reactor are magnetically coupled via mutual inductance M.

[0093] The value of the mutual inductance M is determined by structural parameters such as the distance between the annular portions 6a and 9a, that is, the thickness of the insulating layer 1c of the printed circuit board 1, in addition to the ring size of each of the annular portions 6a and 9a.

[0094] The value of the mutual inductance M is determined by whether or not there is a magnetic body near the annular portion 6 a or the annular portion 9 a .

[0095] In addition, the value of the mutual inductance M increases as the common magnetic flux between the first reactor and the second reactor increases.

[0096] Therefore, the value of the mutual inductance M is as follows: Figure 5 As shown in the case close to the annular portion 6a, for example Figure 4 The situation shown is greater away from the annular portion 6a.

[0097] Here, in response to Figure 6 When the portion 20 including the first reactor and the second reactor is transformed into an equivalent circuit, the circuit diagram of the portion from the input / output terminal 2a of the first circuit 2 to the input / output terminal 3a of the second circuit 3 becomes as follows: Figure 7 The circuit diagram shown.

[0098] Figure 7 This is a circuit diagram in which the portion 20 including the first reactor and the second reactor is converted into an equivalent circuit.

[0099] like Figure 7 As shown, the circuit between the input-output terminal 2a and the input-output terminal 3a is a circuit in which an equivalent negative inductance having a value of -M is inserted in series with the electrostatic capacitance C and the inductance ESL.

[0100] Therefore, the inductance connected in series with the electrostatic capacitance C is ESL-M, and the inductance ESL can be offset by an amount corresponding to the mutual inductance M.

[0101] Generally, regarding inductance, the higher the frequency, the higher the impedance, so the inductance ESL plays a role in deteriorating the effect of suppressing high-frequency components of electromagnetic noise.

[0102] However, in Figure 1In the electrical and electronic device shown, the inductance ESL is canceled by the equivalent negative inductance having a value of -M, so that the effect of suppressing the high-frequency component of electromagnetic noise is unlikely to deteriorate.

[0103] If the structural parameters are designed so that ESL-M=0, the influence of the inductor ESL disappears and the high-frequency component of electromagnetic noise is suppressed more effectively. The inductor ESL can be estimated by using an approximate formula or electromagnetic field analysis during design, so the structural parameters can be designed so that ESL-M=0.

[0104] However, due to the influence of dimensional tolerance or variation during substrate manufacturing, actual inductor ESL may differ from inductor ESL estimated during design. Also, actual structural parameters may differ from structural parameters estimated during design.

[0105] Therefore, sometimes the amount of inductance ESL offset by the equivalent negative inductance having a -M value is lower than the amount of offset at the time of design (ESL-M>0). Also, sometimes the amount of inductance ESL offset by the equivalent negative inductance having a -M value is higher than the amount of offset at the time of design (ESL-M<0).

[0106] Figure 1 The electric and electronic device shown includes a distance adjusting member that adjusts the distance between the annular portion 6a and the magnetic core 11. The distance adjusting member can adjust the amount of cancellation of the inductance ESL generated by the equivalent negative inductance having a value of -M so that ESL-M=0.

[0107] Here, FIG. 8 is an explanatory diagram showing the effect of the noise filter according to the first embodiment.

[0108] Fig. 8A 1 is an explanatory diagram showing the relationship between the position of the magnetic core 11 and the mutual inductance M.

[0109] Figure 8B 1 is an explanatory diagram showing the frequency characteristics of the mutual inductance M and the noise suppression effect.

[0110] Figure 8C It is an explanatory diagram showing the relationship between the position of the magnetic core 11 and the noise suppression effect of high-frequency components.

[0111] Hereinafter, the relationship between the position of the magnetic core 11 and the noise suppression effect will be described with reference to FIG. 8 .

[0112] Here, for the sake of convenience, it is assumed that Figure 5 As shown, when the magnetic core 11 is close to the annular portion 6a of the first conductive layer 1a and the magnetic core 11 is substantially in contact with the first conductive layer 1a, the position of the magnetic core 11 (the distance between the magnetic core 11 and the first conductive layer 1a) is "0".

[0113] like Fig. 8A As shown, when the position of the magnetic core 11 is "0", the mutual inductance M is the largest, and as the magnetic core 11 is away from the first conductive layer 1a, the mutual inductance M decreases.

[0114] Figure 8B This shows that when the mutual inductance M and the inductance ESL are not equal, the effect of suppressing high-frequency components above the resonance frequency in the electromagnetic noise is degraded.

[0115] The resonance here is Figure 7 Since the LC resonance using the combination of electrostatic capacitance C and (ESL-M) is shown, no resonance occurs when M=ESL. Therefore, when M=ESL, the suppression effect of the high frequency component of frequency F does not deteriorate.

[0116] The user rotates the magnetic core 11 by rotating a slotted screwdriver or the like inserted into the slit 12 , and adjusts the position of the magnetic core 11 so that M=ESL, thereby enhancing the effect of suppressing high-frequency components of electromagnetic noise.

[0117] Figure 8C It is shown that when M=ESL, the noise suppression effect of the high-frequency component of frequency F is the best.

[0118] In the above embodiment 1, the noise filter is configured to include: a magnetic core 11 including a magnetic body; and a distance adjustment member that adjusts the distance between the portion of the first conductor wiring 6 and the second conductor wiring 9 that is wired in a ring shape, that is, the ring portion, and the magnetic core 11. Therefore, the noise filter can improve the suppression effect of the high-frequency component of electromagnetic noise without redesigning and remanufacturing the printed circuit board.

[0119] exist Figure 1 In the illustrated electric and electronic device, the annular portion 6 a and the annular portion 9 a are arranged on the same axis so as to substantially overlap each other when the electric and electronic device is viewed from the z direction.

[0120] However, the present invention is not limited thereto, and the electrical and electronic device may be arranged so that only a portion of the annular portion 6a and the annular portion 9a overlap when viewed from the z direction. However, in the portion where only a portion of the annular portion 6a and the annular portion 9a overlap, the magnetic flux generated from the first reactor and the magnetic flux generated from the second reactor need to be in the same direction.

[0121] exist Figure 1 In the illustrated electric and electronic device, the first circuit 2 includes an input-output terminal 2a, and the second circuit 3 includes an input-output terminal 3a.

[0122] However, one end of the conductor wiring 7 may be connected to the first circuit 2 , and the other end of the first conductor wiring 6 may be connected to the second circuit 3 .

[0123] Therefore, the first circuit 2 may not include the input / output terminal 2 a , and the second circuit 3 may not include the input / output terminal 3 a .

[0124] exist Figure 1 The electric and electronic device shown includes a magnetic core 11 made of a magnetic body.

[0125] The magnetic core 11 may be any member as long as it includes a magnetic body, and may be a member including a magnetic body such as iron, ferrite, or stainless steel, and a non-magnetic body such as resin.

[0126] exist Figure 1 In the illustrated electric and electronic device, a magnetic core 11 is shown that can be moved in the z direction by the action of a screw.

[0127] As long as the magnetic core 11 can move along the core supporting member 13 , the movement is not limited to the example in which the magnetic core 11 moves by the action of the screw.

[0128] Therefore, the magnetic core 11 and the core support member 13 do not need to form mutually engaging threads, and the core support member 13 may have a structure that receives movement of the magnetic core 11 by applying pressure or impact to the magnetic core 11 .

[0129] When the core supporting member 13 is structured to receive the movement of the magnetic core 11 by applying pressure or impact to the magnetic core 11 , the distance adjusting member only needs to include the core supporting member 13 , and therefore the slit 12 may not be included.

[0130] exist Figure 1 In the illustrated electric and electronic device, the magnetic core 11 is supported by the core support member 13 due to the friction force between the external thread 11 a and the internal thread 13 b.

[0131] However, the present invention is not limited to this, and the magnetic core 11 and the core supporting member 13 may be fixed using an adhesive, a thermoplastic resin, or the like after the distance is adjusted by the distance adjusting member.

[0132] exist Figure 1 In the illustrated electric and electronic device, the shape of the magnetic core 11 is a cylindrical shape.

[0133] However, this is only an example and may also be Fig. 9 As shown in FIG. 1 , the magnetic core 11 has a shape in which a recessed portion 11 b is provided at an end portion on the −z direction side of the magnetic core 11 .

[0134] In addition, you can also Fig.10As shown in FIG. 1 , the magnetic core 11 has a shape in which a convex portion 11 c is provided at an end portion on the −z direction side of the magnetic core 11 .

[0135] Fig. 9 as well as Fig.10 It is shown Figure 2 as well as Figure 3 A cross-sectional view of the A-A' section.

[0136] exist Figure 1 In the illustrated electric and electronic device, the dimension of the core support member 13 in the xy plane is smaller than the dimension of the annular portion 6 a in the xy plane.

[0137] The core supporting member 13 only needs to be able to support the magnetic core 11 , and the size of the magnetic core 11 in the xy plane may be larger than the size of the annular portion 6 a in the xy plane.

[0138] exist Figure 1 In the illustrated electric and electronic device, the magnetic core 11 is structured to be substantially in contact with the first conductive layer 1 a in a state where the magnetic core 11 is closest to the annular portion 6 a of the first conductive layer 1 a .

[0139] However, the present invention is not limited to this, and even if the magnetic core 11 is brought closest to the annular portion 6a of the first conductive layer 1a, the magnetic core 11 may not be in contact with the first conductive layer 1a.

[0140] exist Figure 1 In the illustrated electric and electronic device, the magnetic core 11 is disposed in a region inside the annular portion 6 a.

[0141] However, the present invention is not limited to this, and only a part of the magnetic core 11 may be arranged in the region inside the annular portion 6 a.

[0142] exist Figure 1 In the illustrated electric and electronic device, the core supporting member 13 is a non-magnetic member.

[0143] However, the present invention is not limited thereto, and the core supporting member 13 may be a composite material member including a non-magnetic body and a magnetic body, or may be a magnetic body member.

[0144] exist Figure 1 In the illustrated electric and electronic device, the core support member 13 is fixed to the printed circuit board 1 by the fixing pins 14 .

[0145] If the core support member 13 is a member formed of resin, the core support member 13 may be fixed to the printed circuit board 1 by deforming the core support member 13 using heat or the like.

[0146] exist Figure 1 In the illustrated electric and electronic device, a printed circuit board 1 includes a first conductor layer 1 a and a second conductor layer 1 b .

[0147] However, the present invention is not limited thereto, and the number of conductor layers in the printed circuit board 1 may be three or more layers, or may be one layer.

[0148] However, when the printed circuit board 1 has one conductor layer, the plane on the +z direction side of the printed circuit board 1 is regarded as the first conductor layer 1a, and the plane on the -z direction side of the printed circuit board 1 is regarded as the second conductor layer 1b.

[0149] exist Figure 1 In the illustrated electric and electronic device, the first conductor wiring 6 forms a first reactor, and the second conductor wiring 9 forms a second reactor.

[0150] The first reactor may be formed by using a metal wiring such as a bus bar instead of the first conductor wiring 6 , and the second reactor may be formed by using a metal wiring such as a bus bar instead of the second conductor wiring 9 .

[0151] Alternatively, metal wiring such as a bus bar may be used as the connection conductor 8 and the connection conductor 10 .

[0152] exist Figure 1 In the illustrated electrical and electronic device, a printed circuit board 1 includes a first circuit 2 and a second circuit 3 .

[0153] Each of the first circuit 2 and the second circuit 3 may be a component constituting an electrical or electronic device, and corresponds to a switching power supply circuit, an inverter circuit, a connector, or the like.

[0154] exist Figure 1 In the illustrated electrical and electronic device, the conductor wiring 7 , the connection conductor 8 , the second conductor wiring 9 , the connection conductor 10 , and the first conductor wiring 6 constitute a power supply pattern that connects the first circuit 2 and the second circuit 3 .

[0155] However, the conductor wiring 7 , the connection conductor 8 , the second conductor wiring 9 , the connection conductor 10 , and the first conductor wiring 6 are not limited to power supply patterns, and may be, for example, conductor wiring for transmitting signals.

[0156] Implementation method 2.

[0157] In the second embodiment, an electric or electronic device is described in which the distance adjusting member receives the movement of the magnetic core 31 in the horizontal direction of the first conductor layer 1 a or the horizontal direction of the second conductor layer 1 b .

[0158] Fig.11 This is a plan view showing a first conductor layer 1 a in a printed circuit board 1 of an electric or electronic device according to a second embodiment.

[0159] Fig.12This is a plan view showing the second conductor layer 1 b in the printed circuit board 1 of the electric and electronic device according to the second embodiment.

[0160] Fig.13 The diagram shows a state in which the magnetic core 31 is not arranged inside the annular portion 6a when the electric and electronic device is viewed from the z direction. Fig.11 as well as Fig.12 Cross-sectional view of the B-B' section.

[0161] Fig.14 The diagram shows a state in which the magnetic core 31 is arranged inside the annular portion 6a when the electric and electronic device is viewed from the z direction. Fig.11 as well as Fig.12 Cross-sectional view of the B-B' section.

[0162] exist Figures 11 to 14 In, with Figures 1 to 5 The same reference numerals represent the same or corresponding parts, and thus their descriptions are omitted.

[0163] The magnetic core 31 is a member including a magnetic body that affects the magnitude of the magnetic field coupling between the first conductor wiring 6 and the second conductor wiring 9 .

[0164] The electric and electronic device according to the second embodiment includes a distance adjusting member that adjusts the distance between the annular portion 6 a and the magnetic core 31 , and the distance adjusting member includes a slit 32 and a core supporting member 33 .

[0165] The slit 32 is formed at the end portion of the magnetic core 31 on the +x direction side.

[0166] The shape of the slit 32 is a shape that matches a slotted screw driver or the like, and the slotted screw driver or the like can be inserted into the slit 32 .

[0167] The core supporting member 33 is a non-magnetic member provided in a region including the annular portion 6 a on a plane on the +z direction side of the first conductive layer 1 a .

[0168] The core supporting member 33 has a through hole 33 a formed therein for inserting the magnetic core 31 , and supports the magnetic core 31 inserted into the through hole 33 a .

[0169] The core support member 33 of the electric and electronic device of Embodiment 2 is provided on the plane on the +z direction side of the first conductor layer 1a. However, this is only an example, and the core support member 33 may be provided in a region including the annular portion 9a on the plane on the -z direction side of the second conductor layer 1b.

[0170] The magnetic core 31 and the core support member 33 form threads that mesh with each other.

[0171] An external thread 31 a is formed on the side surface of the magnetic core 31 , and an internal thread 33 b engaging with the external thread 31 a of the magnetic core 31 is formed in the through hole 33 a of the core support member 33 .

[0172] When the user rotates the magnetic core 31 by rotating a slotted screwdriver or the like inserted into the slit 32 , the magnetic core 31 moves in the x direction due to the action of the screw thread.

[0173] While the magnetic core 11 of the electric and electronic device according to the first embodiment is movable in the z direction, the magnetic core 31 of the electric and electronic device according to the second embodiment is movable in the x direction.

[0174] The electric and electronic device of the first embodiment is the same as the electric and electronic device of the second embodiment except that the moving direction of the magnetic core 11 and the moving direction of the magnetic core 31 are different.

[0175] Therefore, in the electrical and electronic device of the second embodiment, the circuit diagram of the portion from the input / output terminal 2a of the first circuit 2 to the input / output terminal 3a of the second circuit 3 is the same as that of the electrical and electronic device of the first embodiment. Figure 6 as well as Figure 7 same.

[0176] Fig.13 The figure shows a state in which the magnetic core 31 is not arranged inside the annular portion 6 a when the electric and electronic device is viewed from the z direction.

[0177] The state in which the magnetic core 31 is not arranged inside the annular portion 6 a corresponds to a state in which the distance between the annular portion 6 a and the magnetic core 31 is large.

[0178] Therefore, the magnetic core 31 in a state where the magnetic core 31 is not arranged inside the annular portion 6 a has little influence on the magnitude of the magnetic field coupling between the first conductor wiring 6 and the second conductor wiring 9 .

[0179] Fig.14 The figure shows a state in which the magnetic core 31 is arranged inside the annular portion 6 a when the electric and electronic device is viewed from the z direction.

[0180] The state in which the magnetic core 31 is arranged inside the annular portion 6 a corresponds to a state in which the distance between the annular portion 6 a and the magnetic core 31 is close.

[0181] Therefore, the magnetic core 31 in a state where the magnetic core 31 is arranged inside the annular portion 6 a has a large influence on the magnitude of the magnetic field coupling between the first conductor wiring 6 and the second conductor wiring 9 .

[0182] The value of the mutual inductance M varies according to the influence of the magnetic core 31. Fig.14In the case where the ring portion 6a is disposed inside, for example Fig.13 The case shown is larger than that not arranged on the inner side of the annular portion 6a.

[0183] When only a part of the magnetic core 31 is arranged inside the annular portion 6 a , the value of the mutual inductance M is smaller than when the entire magnetic core 31 is arranged inside the annular portion 6 a .

[0184] In addition, the value of the mutual inductance M is larger when only a part of the magnetic core 31 is arranged inside the annular portion 6 a than when all of the magnetic core 31 is not arranged inside the annular portion 6 a .

[0185] Even when the entire magnetic core 31 is disposed inside the annular portion 6 a , the value of the mutual inductance M increases as the position of the magnetic core 31 approaches the center of the inner side of the annular portion 6 a .

[0186] By moving the magnetic core 31 in the x direction using the distance adjusting member to adjust the position of the magnetic core 31 , the influence of the inductance ESL can be eliminated.

[0187] Specifically, the user rotates the magnetic core 31 by rotating a slotted screwdriver or the like inserted into the slit 32 , and adjusts the position of the magnetic core 31 so that M=ESL, thereby improving the effect of suppressing the high-frequency component of electromagnetic noise.

[0188] In the above-mentioned second embodiment, the noise filter is configured to include: a magnetic core 31; and a distance adjustment member that adjusts the distance between the annular portion of one or more of the first conductor wiring 6 and the second conductor wiring 9 and the magnetic core 31. Therefore, the noise filter can improve the suppression effect of the high-frequency component of electromagnetic noise without redesigning and remanufacturing the printed circuit board.

[0189] In the second embodiment, the noise filter is configured such that the distance adjustment member receives the movement of the magnetic core 31 in the horizontal direction of the first conductor layer 1a or the horizontal direction of the second conductor layer 1b. Therefore, the noise filter can reduce the space in the z direction compared with the noise filter of the first embodiment.

[0190] In the electric and electronic device according to the second embodiment, the distance adjusting member receives the movement of the magnetic core 31 in the x direction.

[0191] However, the distance adjustment member may be any member that receives movement of the magnetic core 31 in the horizontal direction of the first conductor layer 1a or the horizontal direction of the second conductor layer 1b, and the distance adjustment member may be, for example, a member that receives movement of the magnetic core 31 in the y direction. In addition, the distance adjustment member may be a member that receives movement of the magnetic core 31 in any direction within the xy plane in the first conductor layer 1a or the second conductor layer 1b.

[0192] In the electric and electronic device of the second embodiment, the magnetic core 31 is shown to be movable in the x direction by the action of the screw.

[0193] As long as the magnetic core 31 can move along the core supporting member 33 , the movement is not limited to the example in which the magnetic core 31 moves by the action of the screw.

[0194] Therefore, the magnetic core 31 and the core support member 33 do not need to form mutually engaging threads, and the core support member 33 may have a structure that receives movement of the magnetic core 31 by applying pressure or impact to the magnetic core 31 .

[0195] When the core supporting member 33 is structured to receive the movement of the magnetic core 31 by applying pressure or impact to the magnetic core 31 , the distance adjusting member only needs to include the core supporting member 33 and may not include the slit 32 .

[0196] In the electric and electronic device according to the second embodiment, the magnetic core 31 is supported by the core supporting member 33 due to the frictional force between the external thread 31 a and the internal thread 33 b .

[0197] However, the present invention is not limited to this, and the magnetic core 31 and the core supporting member 33 may be fixed using an adhesive or a thermoplastic resin after the distance is adjusted by the distance adjusting member.

[0198] Implementation method 3.

[0199] The magnetic core 11 of the electric and electronic device according to the first embodiment is inserted into the through hole 13 a of the core support member 13 .

[0200] In the third embodiment, an electric and electronic device in which the magnetic core 11 is inserted into the through hole 40 formed in the printed circuit board 1 will be described.

[0201] The electric and electronic device of the third embodiment is different from the electric and electronic device of the first embodiment in that it does not include the core supporting member 13 , and the other parts are the same.

[0202] Fig.15 It is a cross-sectional view of the electric and electronic device according to the third embodiment in a state where the magnetic core 11 is separated from the annular portion 9a of the second conductor layer 1b.

[0203] Fig.16 It is a cross-sectional view of the electric and electronic device according to the third embodiment in a state where the magnetic core 11 is close to the annular portion 9a of the second conductor layer 1b.

[0204] exist Fig.15 as well as Fig.16 In, with Figures 1 to 5 The same reference numerals represent the same or corresponding parts, and thus their descriptions are omitted.

[0205] On the side of the magnetic core 11, a Figure 4 as well as Figure 5 The external thread 11a is shown.

[0206] A through hole 40 for inserting the magnetic core 11 is formed in a region inside the annular portion 6 a and a region inside the annular portion 9 a .

[0207] The inner wall of the through hole 40 is formed with an internal thread 40 a that engages with the external thread 11 a of the magnetic core 11 .

[0208] The electric and electronic device of the third embodiment includes a distance adjusting member that adjusts the distance between the annular portion 6 a and the annular portion 9 a and the magnetic core 11 , and the distance adjusting member includes the slit 12 , the through hole 40 , and the internal thread 40 a .

[0209] Fig.15 A state in which a part of the magnetic core 11 is inserted into the through hole 40 is shown.

[0210] Fig.16 The state in which most of the magnetic core 11 is inserted into the through hole 40 is shown.

[0211] The magnetic core 11 in a state where most of the magnetic core 11 is inserted into the through-hole 40 has a greater influence on the magnitude of the magnetic field coupling than the magnetic core 11 in a state where a part of the magnetic core 11 is inserted into the through-hole 40 .

[0212] The value of the mutual inductance M varies according to the influence of the magnetic core 11. Fig.16 When most of the magnetic core 11 is inserted into the through hole 40, for example Fig.15 The case where a part of the magnetic core 11 is inserted into the through hole 40 is larger.

[0213] By moving the magnetic core 11 in the z direction using the distance adjusting member to adjust the position of the magnetic core 11 , the influence of the inductance ESL can be eliminated.

[0214] Specifically, the user rotates the magnetic core 11 by rotating a slotted screwdriver or the like inserted into the slit 12 , and adjusts the position of the magnetic core 11 so that M=ESL, thereby improving the effect of suppressing the high-frequency component of electromagnetic noise.

[0215] As described above, the electrical and electronic device of the third embodiment can also improve the effect of suppressing the high-frequency component of electromagnetic noise without redesigning and remanufacturing the printed circuit board, similarly to the electrical and electronic device of the first embodiment.

[0216] In the electric and electronic device of the third embodiment, the core support member 13 is not required, so the cost can be reduced compared with the electric and electronic device of the first embodiment.

[0217] In the electric and electronic device of the third embodiment, the magnetic core 11 is shown to be movable in the z direction by the action of the screw.

[0218] As long as the magnetic core 11 can move along the through hole 40 , the movement is not limited to the example in which the magnetic core 11 moves by the action of the screw.

[0219] Therefore, the magnetic core 11 and the through hole 40 do not need to form threads that mesh with each other, and the through hole 40 may have a structure that receives movement of the magnetic core 11 when pressure or impact is applied to the magnetic core 11 .

[0220] When the through hole 40 is structured to receive the movement of the magnetic core 11 by applying pressure or impact to the magnetic core 11 , the distance adjusting member may include the through hole 40 .

[0221] Furthermore, the through hole 40 may be plated with a conductor.

[0222] Implementation method 4.

[0223] In the electric and electronic device according to the first embodiment, the core support member 13 is provided on the plane on the +z direction side of the first conductor layer 1 a .

[0224] In the fourth embodiment, an electric and electronic device in which a frame 53 that houses a printed circuit board 1 plays a role as a core supporting member will be described.

[0225] Fig.17 It is a cross-sectional view of the electric and electronic device according to the fourth embodiment in a state where the magnetic core 51 is separated from the annular portion 6 a of the first conductive layer 1 a .

[0226] Fig.18 It is a cross-sectional view of the electric and electronic device according to the fourth embodiment in a state where the magnetic core 51 is close to the annular portion 6 a of the first conductor layer 1 a .

[0227] exist Fig.17 as well as Fig.18 In, with Figures 1 to 5 The same reference numerals represent the same or corresponding parts, and thus their descriptions are omitted.

[0228] The magnetic core 51 is a member including a magnetic body that affects the magnitude of the magnetic field coupling between the first conductor wiring 6 and the second conductor wiring 9 .

[0229] The slit 52 is formed at the end portion of the magnetic core 51 on the +z direction side.

[0230] The shape of the slit 52 is a shape that matches a slotted screw driver or the like, and the slotted screw driver or the like is inserted into the slit 52 .

[0231] The frame 53 is a housing that accommodates the printed circuit board 1. The frame 53 may be a metal housing or a non-metal housing such as a resin.

[0232] A through hole 54 for inserting the magnetic core 51 is formed in the region of the frame body 53 inside the annular portion 6 a in the +z direction, and the frame body 53 supports the magnetic core 51 inserted in the through hole 54 .

[0233] The magnetic core 51 and the through hole 54 form threads that mesh with each other.

[0234] An external thread 51 a is formed on the side surface of the magnetic core 51 , and an internal thread 54 a that engages with the external thread 51 a is formed on the inner wall of the through hole 54 .

[0235] When the user rotates the magnetic core 51 by rotating a slotted screwdriver or the like inserted into the slit 52 , the magnetic core 51 moves in the z direction due to the action of the screw thread.

[0236] The movement of the magnetic core 51 in the +z direction is the movement of the magnetic core 51 away from the annular portion 6 a , and the movement of the magnetic core 51 in the −z direction is the movement of the magnetic core 51 toward the annular portion 6 a .

[0237] The distance adjusting member in the electric and electronic device according to the fourth embodiment includes a slit 52 and a frame 53 .

[0238] exist Fig.17 as well as Fig.18 In the electrical and electronic device shown, the through hole 54 is formed in the +z direction region of the region inside the annular portion 6a of the frame 53. However, this is only an example, and the through hole 54 may be formed in the -z direction region of the region inside the annular portion 9a of the frame 53.

[0239] Fig.17 The state where the magnetic core 51 is separated from the annular portion 6 a of the first conductive layer 1 a is shown.

[0240] Fig.18 The state where the magnetic core 51 is close to the annular portion 6a of the first conductive layer 1a is shown.

[0241] The magnetic core 51 in a state where the magnetic core 51 is close to the annular portion 6 a has a greater influence on the magnitude of the magnetic field coupling than the magnetic core 51 in a state where the magnetic core 51 is far from the annular portion 6 a .

[0242] The value of the mutual inductance M varies according to the influence of the magnetic core 51. Fig.18 When the magnetic core 51 is close to the annular portion 6a, for example Fig.17 The magnetic core 51 is shown to be further away from the annular portion 6 a.

[0243] By moving the magnetic core 51 in the z direction using the distance adjusting member to adjust the position of the magnetic core 51 , the influence of the inductance ESL can be eliminated.

[0244] Specifically, the user rotates the magnetic core 51 by rotating a slotted screwdriver or the like inserted into the slit 52 , and adjusts the position of the magnetic core 51 so that M=ESL, thereby improving the effect of suppressing the high-frequency component of electromagnetic noise.

[0245] As described above, the electric and electronic device according to the fourth embodiment can also improve the effect of suppressing the high-frequency component of electromagnetic noise without redesigning and remanufacturing the printed circuit board, similarly to the electric and electronic device according to the first embodiment.

[0246] In the electric and electronic device of the fourth embodiment, the frame 53 supports the magnetic core 51 and the magnetic core 51 can be rotated from the outside of the frame 53. Therefore, when the user adjusts the position of the magnetic core 51, the user can save the trouble of removing the case accommodating the printed circuit board 1.

[0247] The electric and electronic device according to the fourth embodiment includes a magnetic core 51 made of a magnetic body.

[0248] The magnetic core 51 may be any member as long as it includes a magnetic body, and may be a member including a magnetic body such as iron, ferrite, or stainless steel, and a non-magnetic body such as resin.

[0249] In the electric and electronic device of the fourth embodiment, the magnetic core 51 which is movable in the z direction by the action of the screw is shown.

[0250] As long as the magnetic core 51 can move along the through hole 54 , the movement is not limited to the example in which the magnetic core 51 moves by the action of the screw.

[0251] Therefore, the magnetic core 51 and the through hole 54 do not need to have threads that mesh with each other, and the frame 53 may have a structure that receives movement of the magnetic core 51 when pressure or impact is applied to the magnetic core 51 .

[0252] When the frame 53 is structured to receive the movement of the magnetic core 51 by applying pressure or impact to the magnetic core 51 , the distance adjusting member only needs to include the frame 53 and may not include the slit 52 .

[0253] In the electric and electronic device according to the fourth embodiment, the magnetic core 51 is supported by the frame body 53 due to the frictional force between the external thread 51 a and the internal thread 54 a .

[0254] However, the present invention is not limited to this, and the magnetic core 51 and the frame body 53 may be fixed using an adhesive or a thermoplastic resin after the distance is adjusted by the distance adjusting member.

[0255] Furthermore, the present invention can realize free combination of the embodiments, modification of arbitrary components of the embodiments, or omission of arbitrary components of the embodiments within the scope of the invention.

[0256]

Industrial Applicability

[0257] The present invention is suitable for a noise filter including a conductor wiring wired in a loop shape.

[0258] Furthermore, the present invention is suitable for electric and electronic equipment including a noise filter.

Claims

1. A noise filter comprising: A ground line connected between a first circuit and a second circuit, wherein the first circuit is mounted on a first conductor layer in a substrate, and the second circuit is mounted on the first conductor layer; A capacitor, one end of which is connected to the ground wire; a first conductor wiring connected between the other end of the capacitor and the second circuit and wired in a loop shape on the first conductor layer; A second conductor wiring is connected between the first circuit and the other end of the capacitor, and is wired in a loop shape in the second conductor layer in the substrate to be magnetically coupled with the first conductor wiring; A magnetic core comprising a magnetic body; as well as a distance adjustment member for adjusting the distance between the magnetic core and a ring portion of one or more conductor wirings of the first conductor wiring and the second conductor wiring, The distance adjusting member receives movement of the magnetic core in a horizontal direction of the first conductive layer or in a horizontal direction of the second conductive layer.

2. The noise filter according to claim 1, characterized in that The loop portion of the first conductor wiring and the loop portion of the second conductor wiring are wound in the same direction.

3. The noise filter according to claim 2, characterized in that The loop portion of the first conductor wiring and the loop portion of the second conductor wiring are arranged on the same axis.

4. The noise filter according to claim 1, characterized in that When the substrate is viewed from a direction perpendicular to the first conductor layer and the second conductor layer, a part or all of the magnetic core is adjusted by the distance adjusting member to a position disposed inside the loop portion of the one or more conductor wirings.

5. The noise filter according to claim 1, characterized in that The magnetic core and the distance adjusting member are formed with threads that mesh with each other.

6. An electrical and electronic device, characterized in that: have: A first circuit mounted on a first conductor layer in the substrate; a second circuit mounted on the first conductor layer; and a noise filter for suppressing the transmission of electromagnetic noise between the first circuit and the second circuit, The noise filter has: A ground wire connected between the first circuit and the second circuit; A capacitor, one end of which is connected to the ground wire; a first conductor wiring connected between the other end of the capacitor and the second circuit and wired in a loop shape on the first conductor layer; A second conductor wiring is connected between the first circuit and the other end of the capacitor, and is wired in a loop shape in the second conductor layer in the substrate to be magnetically coupled with the first conductor wiring; A magnetic core comprising a magnetic body; as well as a distance adjustment member for adjusting the distance between the magnetic core and a ring portion of one or more conductor wirings of the first conductor wiring and the second conductor wiring, The distance adjusting member receives movement of the magnetic core in a horizontal direction of the first conductive layer or in a horizontal direction of the second conductive layer.

Images