WO2005029516A1 - 信号弁別器 - Google Patents
信号弁別器 Download PDFInfo
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- WO2005029516A1 WO2005029516A1 PCT/JP2003/012043 JP0312043W WO2005029516A1 WO 2005029516 A1 WO2005029516 A1 WO 2005029516A1 JP 0312043 W JP0312043 W JP 0312043W WO 2005029516 A1 WO2005029516 A1 WO 2005029516A1
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- frequency
- reactance
- signal
- noise
- signal discriminator
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- 239000000696 magnetic material Substances 0.000 claims abstract description 35
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000001939 inductive effect Effects 0.000 abstract description 5
- 230000003247 decreasing effect Effects 0.000 abstract 3
- 239000011162 core material Substances 0.000 description 44
- 230000035699 permeability Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 239000011812 mixed powder Substances 0.000 description 9
- 229910018605 Ni—Zn Inorganic materials 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000008859 change Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 230000004907 flux Effects 0.000 description 6
- 238000004804 winding Methods 0.000 description 6
- 230000001965 increasing effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 101150107341 RERE gene Proteins 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000012776 electronic material Substances 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
- C04B35/2625—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing magnesium
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- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
- H01F1/342—Oxides
- H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
- H01F17/06—Fixed inductances of the signal type with magnetic core with core substantially closed in itself, e.g. toroid
- H01F2017/065—Core mounted around conductor to absorb noise, e.g. EMI filter
Definitions
- the present invention relates to a signal discriminator, and more particularly to a signal discriminator having good noise cutoff characteristics and no waveform distortion.
- the signal discriminator has a structure in which a signal line and a power supply line of an electronic device pass through a cylindrical or toroidal magnetic core.
- a cable 1 such as a signal line or a power supply line is penetrated by a cylindrical magnetic core 2.
- the outside of the magnetic core 2 is covered with an insulator 3.
- This cylindrical or toroidal core 2 has a structure in which a closed magnetic circuit is formed by a single core 2 as shown in FIG. 9 (a), for example, and a plurality of cores as shown in FIG. 9 (b). There is a structure in which a closed magnetic circuit is formed by combining 2a and 2b.
- FIG. 10 (a) and FIG. 10 (b) show frequency characteristic curves of magnetic permeability IX and impedance Z in a magnetic core using such a soft magnetic material.
- the pure resistance component (R) caused by the imaginary magnetic permeability (') provides a high-frequency noise absorption effect as described later, and is used as a signal discriminator for separating noise and signals.
- the impedance Z of the magnetic core having the above characteristics has been expressed by the magnetic permeability ⁇ as follows. '
- X is a reactance component generated by the real part ⁇ ′ of the magnetic permeability ⁇ , and : Proportional component.
- R is a resistance component caused by the imaginary part / "of the magnetic permeability ⁇ , and is composed of winding resistance, iron loss, etc. As will be described later, in actuality, the X and R components respectively have winding-winding The capacitance between the core and the capacitance between the core and the winding is also included.
- the magnetic permeability is represented by a real part ⁇ 'and an imaginary part ⁇ ", and the real part decreases at high frequencies. That is, the property as the inductance is lost. The part starts to increase from a certain frequency band, and after the maximum value, decreases again.
- Such an imaginary part ′ acts as a pure resistance component as a signal discriminator. That is, high-frequency signals or noise are consumed as heat energy.
- FIG. 10 (a) When FIG. 10 (a) is shown by a change in impedance Z as a signal discriminator, it becomes as shown in FIG. 10 (b). That is, at low frequencies, the reactance component X is dominant, and at high frequencies, the imaginary part ⁇ ”increases and the resistance component R becomes dominant. The reactance component X reflects noise, and the resistance component R converts noise to thermal energy. Convert to
- the reactance component X prevents noise transmitted through the cable by reflecting the noise mixed into the cable to the input side, the reflected noise becomes another noise source and radiated noise. It is possible that On the other hand, the resistance component R converts noise to heat energy and consumes it, so there is no effect as noise on others. Therefore, it is desirable to remove noise by converting it to heat energy.
- the frequency at which the reactance component X and the resistance component R are the same is called the X-R cross point frequency.
- the X-R cross point frequency is low. The higher the frequency, the greater the effect of noise reduction from low frequencies.
- Ni— ⁇ -based ferrite having a high specific resistance has been used in order to obtain frequency characteristics as shown in the example of FIG.
- the raw material is expensive, the price as a signal discriminator becomes expensive, and there are economic and manufacturing technical problems such as requiring a dedicated manufacturing process.
- Mn_Zn ferrites that are inexpensive and have good characteristics.
- the specific resistance of general Mn-Zn ferrites is lower than that of Fe3 + and Fe2 + .
- the resistivity is as low as 0.1 to 1 ⁇ ⁇ due to the transfer of electrons between The eddy current loss increases from the frequency and the usable frequency is limited to about several hundred kHz. Further, in a frequency region exceeding this, the magnetic permeability (initial magnetic permeability) is remarkably reduced, and there is a problem that the characteristics as a soft magnetic material are completely lost.
- a cover and a coating of an insulating film are required, which has a disadvantage of increasing the price.
- the signal discriminator uses a relatively inexpensive material (Mg-Zn-based ferrite) that does not contain Ni or the like, and uses the conventional expensive Ni-Zn by a conventional general manufacturing process. It is intended to provide an economical signal discriminator by producing a magnetic core having a magnetic permeability and impedance having substantially the same frequency characteristics as a system magnetic core.
- the main component of the magnetic core has the following (a) to (d), and the auxiliary component auxiliary has the material composition of the following (e) to achieve the above object.
- the conventional Ni—Zn-based magnetic core has high specific resistance and good high-frequency characteristics.
- the resonance frequency of the coil is high, and the XR cross point frequency exists at 10 MHz or more.
- the characteristics of the magnetic core formed of Mg—Zn-based ferrite disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 05-2833223 are different from those of the conventional Ni—Zn-based magnetic core.
- the magnetic core has substantially the same frequency characteristics and magnetic permeability and impedance. Therefore, similar to the conventional Ni-Zn-based magnetic core, signal waveforms are distorted, and characteristics such as saturation magnetic flux density of the magnetic material are inferior to other magnetic materials. In order to obtain the same characteristics as a signal discriminator, Must be bigger. In particular, when used for power lines carrying large currents, and when ripple current or surge noise is a problem, the dimensions must be further increased to prevent magnetic saturation.
- the present invention solves the above problem and utilizes the change in the dielectric constant of the Mn-Zn-based ferrite to exhibit an impedance characteristic equivalent to that of a conventional signal discriminator using a Ni-Zn-based magnetic core. It is another object of the present invention to provide a high-withstand-voltage signal discriminator in which a waveform distortion caused by high-frequency noise is reduced in a high-frequency noise band. Disclosure of the invention
- the impedance Z of the conventional magnetic core was expressed by (Equation 1) and (Equation 2).
- a magnetic substrate should be treated as a purely magnetic material when only an electrostatic field acts. It is known that when high-frequency electric and magnetic fields such as microwaves are used simultaneously, not only magnetic properties but also dielectric properties are exhibited.
- the dielectric constant of the ferrite can be on the order of thousands at low frequencies (below the kHz band). Above the 1 MHz band, most ferrites exceed the dispersion phenomenon and become In the band, the dielectric constant of many ferrites is on the order of 10 to 15. j It is also known.
- the present inventors have paid attention to the above points, and have increased the specific resistance of a magnetic core using a relatively inexpensive soft magnetic material that does not contain Ni or the like.
- the frequency was determined to be higher in the low-frequency range and lower in the high-frequency range than the frequency of the electric signal flowing through the cable, so that it can be manufactured by the conventional general manufacturing process.
- the resistance component as a signal discriminator can be reduced in the low frequency band and increased in the frequency band of the noise signal, thereby reducing the waveform distortion caused by the high frequency noise.
- a closed magnetic circuit is formed by a soft magnetic material, an electric signal flowing through the cable is passed through the closed magnetic circuit, and a noise signal is cut off.
- the relative permittivity changes according to the frequency, and the real part of the complex relative permittivity is larger in the low frequency region than in the frequency of the electric signal flowing through the cable, and smaller in the high frequency region.
- the real part of the complex relative permittivity of the soft magnetic material is 1, 0 0 0 or more at 1 KHz, and 2 0,
- a special feature is that it is not more than 0000 and not more than 50 at 1 MHz.
- the basic component composition of the soft magnetic material is Fe 2 0 3 44.0 to 50.0, according to the signal discriminator according to claim 1 or 2.
- mol% excluding the 50. Omol%
- Ti0 2 and Sn0 either or both of the two is 0. 1 ⁇ 8. Omol%, the balance being MnO It is a Mn-Zn ferrite characterized by having a material composition.
- a signal discriminator according to a fifth aspect is the signal discriminator according to any one of the first to fourth aspects, wherein the specific resistance of the soft magnetic material is 150 ⁇ or more.
- Fig. 1 is a diagram for explaining the movement of the X-R crosspoint frequency.
- Fig. 1 (a) is a frequency characteristic diagram
- Fig. 1 (b) is an equivalent circuit of a signal discriminator.
- FIG. 2 shows the basic component compositions (unit: mol 1%) of the magnetic core using the soft magnetic material of the embodiment of the present invention and the magnetic core using the soft magnetic material used for comparison.
- Fig. 3 shows the measured values of the basic characteristics of the magnetic core formed with the basic composition shown in Fig. 2 (unit: m o 1%).
- Figure 4 shows the frequency characteristics of the real part ⁇ 'of the complex relative permittivity of Samples 1, 2, 3, and 4. is there.
- FIG. 5 is a diagram showing a change in the impedance Z of the signal valve IJ device in each sample.
- Figure 6 shows the impedance of the sample 1 separated into the reactance component X2 and the resistance component R.
- Figure 7 shows the impedance of the sample 4 separated into a reactance component XI and a resistance component R.
- FIG. 8 is a diagram of a conventional signal discriminator.
- Fig. 9 is a diagram illustrating a conventional cylindrical or toroidal magnetic core.
- Fig. 9 (a) is a structural diagram in which a closed magnetic circuit is formed by one magnetic core, and Fig. 9 (b) is divided into multiple parts.
- FIG. 3 is a structural diagram of forming a closed magnetic circuit by combining magnetic cores.
- FIG. 10 is a graph showing the frequency characteristic of the magnetic permeability ⁇ and impedance ⁇ ⁇ ⁇ ⁇ in a magnetic core using a soft magnetic material, and Fig. 10 (a) shows the magnetic permeability; u and Fig. 10 (b) FIG. 6 is a diagram illustrating impedance Z. BEST MODE FOR CARRYING OUT THE INVENTION
- a magnetic core using a soft magnetic material such as ferrite exhibits not only magnetic properties but also dielectric properties, and the dielectric constant changes with frequency. Therefore, the impedance Z expressed by (Equation 1) is affected by the dielectric constant ⁇ .
- the magnetic core using the soft magnetic material will be described in consideration of not only the magnetic permeability ⁇ but also the dielectric constant ⁇ .
- the dielectric constant ⁇ is defined as (Equation 3).
- ⁇ ' is the real part of the permittivity ⁇
- ⁇ " is the imaginary part of the permittivity ⁇
- the frequency characteristic of the reactance component X is influenced by the dielectric constant ⁇ in the low frequency band.
- the effect is that the X-R cross point frequency moves to the lower frequency side.
- Fig. 1 is a diagram for explaining the movement of the X-R crosspoint frequency.
- Fig. 1 (a) shows the frequency characteristics of ⁇ ', R and X
- Fig. 1 (b) shows the signal discriminator. It is an equivalent circuit.
- the horizontal axis is frequency
- the vertical axis is reactance components X1, X2, resistance component R, and real parts ⁇ '1 and ⁇ '2 of permittivity.
- the reactance components X 1 and X 2 have a small real part ⁇ ′ of the permittivity and are constant ( ⁇ ′1), respectively, and a real part ⁇ ′ of the permittivity is large in the low frequency band and high in the high frequency band. This is the reactance component when it changes so as to be smaller ( ⁇ ′ 2).
- X R1 and X R2 are X-R cross point frequencies at which the reactance components X I and X 2 and the resistance component R intersect, respectively.
- the signal discriminator is represented by a parallel circuit consisting of a resistance component, an inductive reactance L and a capacitive reactance C.
- the capacitive reactance C is composed of the stray capacitance between the windings and the stray capacitance between the core and the winding.
- the stray capacitance between the core and the winding depends on the real part of the dielectric constant of the core. That is, when the real part of the dielectric constant is large, the capacitive reactance C increases.
- the soft magnetic material of the present invention has a capacitive reactance C that depends on the real part of the dielectric constant, the complex relative permittivity of which varies with the frequency, and the real part of the complex relative permittivity flows through the cable. Higher in the low frequency range than the frequency of the electrical signal, lower in the high frequency range .
- the reactance component X 2 is such that the capacitive reactance C cannot be ignored in the low-frequency region with respect to the inductive reactance L, and the effect of the reactance component X 2 as a parallel circuit of the capacitive reactance C and the inductive reactance L: X 2 Decrease (shape change).
- the effect of the capacitive reactance C decreases at high frequencies.
- the reactance component X 2 is reduced compared to the reactance component X 1 without changing the impedance characteristic Z as a whole, and the X—R crosspoint frequency is lower than the XR 1 X— Move to R cross point frequency XR 2.
- the frequency characteristic of the reactance component X is changed by the influence of the dielectric constant ⁇ , the X-R cross point frequency is shifted to the lower frequency side, and the noise in the frequency band where the noise component exists is reduced. Converted to heat energy, produced by high frequency noise Reduces shear waveform distortion.
- FIG. 2 shows the basic component compositions (in units of mo) of the magnetic cores using the soft magnetic materials of Examples 1 and 2, which are the embodiments of the present invention, and the magnetic cores using the soft magnetic material used for comparison. 1%).
- reference numeral S 1 denotes Example 1
- reference numeral S 2 denotes Example 2
- reference numerals S 3, S 4, and S 5 denote basic component compositions (unit: mo) of soft magnetic materials used for comparison. 1%).
- the symbols S1, S2, S3, S4, and S5 are referred to as sample 1, sample 2, sample 3, sample 4, and sample 5, respectively.
- the frequency of the signal to be used is in the 1 MHz band and the frequency of the noise to be removed is in the 10 to 500 MHz band.
- the XR cross point frequency for discriminating the frequency of the signal from the noise is set to 1 OMHz or less.
- the specific resistance p is determined by the force determined by the voltage applied to the cables such as signal lines and power supply lines. Let it be 150 ⁇ ⁇ . Under the above conditions, the real part ⁇ ′ of the complex relative permittivity of the soft magnetic material is set to be equal to or more than 1, 000 at 1 ⁇ ⁇ and equal to or less than 20, 000, and equal to or less than 50 at 1 MHz. The basic component composition was determined.
- the real part ⁇ ′ of the complex relative permittivity of the soft magnetic material is not less than 1,000 and not more than 20,000 at 1 ⁇ ⁇ This is because the reactance C is too small and the shape of the frequency characteristic of the reactance X does not change.If it exceeds 20 and 00, the reactance X changes remarkably because the capacitive reactance C is too large and the overall impedance characteristic becomes It is a force that has an effect up to that point. Furthermore, the reason that the real part ⁇ ′ of the complex relative permittivity is 50 or less at 1 MHz is that if it exceeds 50, the capacitive reactance C in the high frequency band is too large, so that the impedance characteristic in the high frequency band is high. Is deteriorated.
- the basic component composition of Sample 1 is as follows: F3 ⁇ 40 3 44.0 to 50,0 mol% (excluding 50 Omol%), ZnO 4.0 to 26. 5 mol%, Ti0 2 Contact Yopi Sn0 either or both of the two is 0. 1 ⁇ 8. Omol%, from a range of material composition of the remainder MnO, Fe 2 0 3 47. 0 mol%, ZnO 10. 5 mol%, Ti0 2 1. Omol 0/0, MnO 41. 5 raol% Is the case.
- the mixed powder is preliminarily calcined in the air at 900 ° C. for 2 hours.
- finely pulverize in a ball mill until the average crystal grain size becomes approximately 1.4 ⁇ m.
- the toroidal-shaped magnetic core has, for example, an outer diameter of 15 mm, an inner diameter of 8 ⁇ , and a height of 3 nmi. After that, baking is performed at 115 ° C. for 3 hours in an atmosphere in which nitrogen is supplied and oxygen partial pressure is controlled.
- the basic component composition of Sample 2 is, as in the case of the soft magnetic material indicated by the symbol S2 in FIG. 2, Fe 2 0 3 44.0 to 50.0 mol% (however, excluding 50. Omol%), ZnO 4. 0 ⁇ 26. 5 mol%, Ti0 2 Contact Yopi Sn0 1 kind or two kinds 0.1 to 8 of the 2. 0mol%, CuO 0. 1 ⁇ 16 . 0 mol%, the range of material composition of the remainder MnO from, Fe 2 0 3 47. 0 mol %, ZnO 10. 5 mol%, Sn0 2 0. 5mol%, MnO 39. 5 mol%, a case where a CuO 1. 5 mol%.
- Advance Fe 2 0 3 as a main component, ZnO, Sn0 2, MnO, each original department powders ⁇ Pi CuO were weighed to make a predetermined ratio shown in FIG. 2, by mixing them in a ball mill A mixed powder is obtained, and the mixed powder is calcined at 900 ° C. for 2 hours in the atmosphere. Next, it was pulverized with a ball mill until the average crystal grain size became approximately 1.4 m.
- the toroidal magnetic core has, for example, an outer diameter of 15 mm, an inner diameter of 8 mm, and a height of 3 mm after being baked. After that, baking is performed at 115 ° C. for 3 hours in an atmosphere in which nitrogen is supplied and oxygen partial pressure is controlled.
- Sample 3 4, shown in 5, the soft magnetic material used for comparison in advance Fe as a main component 2 0 3, ZnO, Mn0, Ni, each raw material powder of MgO and CuO in FIG. 2
- the mixture is weighed so as to have the specified ratio as shown, and they are mixed by a ball mill to obtain a mixed powder.
- the mixed powder is calcined in the air at 900 ° C. for 2 hours.
- it was pulverized with a ball mill until the average crystal grain size became about 1.4 ⁇ m.
- Polyvinyl alcohol is added to the mixed powder to granulate, and the pressure is reduced to 80 MPa. A force is applied to form a toroidal core.
- the toroidal magnetic core has, for example, an outer diameter of 15 mm, an inner diameter of 8 mm, and a height of 3 mm after being baked. Thereafter, the sample with reference sign S 3 was baked at 1,150 ° C for 3 hours in an atmosphere in which nitrogen was introduced and oxygen partial pressure was controlled, and samples 4 and 5 were baked in air at 1,150 ° C for 3 hours. Fired for hours.
- Fig. 3 shows the measured values of the basic characteristics of the magnetic core formed with the basic component composition shown in Fig. 2 (unit: mo 1%). Symbols S1, S2, S3, S4, and S5 are used the same as in FIG. 0.1 Initial permeability at 1 MHz ⁇ 1, 1, 194 AZm Saturation magnetic flux density B s, specific resistance p V, and real part ⁇ 'of complex relative permittivity at 1 KHz and 1 MHz .
- Sample 1, Sample 2, and Sample 4 of the Ni— ⁇ ⁇ system have good results in initial magnetic permeability ⁇ i, saturation magnetic flux density B s, and specific resistance p V.
- sample 3 of the general Mn-Zn system has good initial magnetic permeability i and saturated magnetic flux density Bs, but has a very low specific resistance; 0 V, and is difficult to use at high frequencies. is there.
- the specific resistance is extremely low, it is necessary to use a cable having a thin insulating film on the surface thereof or a cable having an insulating film, which limits the application.
- Sample 5 of the Mg-Zn system has a low saturation magnetic flux density B s and has no advantage over other samples.
- the signal discriminator is required not to be magnetically saturated with respect to ripple current or surge noise, the sample 5 having a low saturation magnetic flux density Bs must have a large core size.
- FIG. 4 shows the frequency characteristics of the real part f ′ of the complex relative permittivity in Samples 1, 2, 3, and 4.
- the real part ⁇ 'of the complex relative permittivity of Samples 1 and 2 at 1 KHz is 10,000 or more, but the real part ⁇ ' of the complex relative permittivity decreases from about 5 KHz. At 1 MHz, the value is about 30.
- the real part ⁇ 1 of the complex relative permittivity is 100,000 or more, even at 1 MHz, the value is about 2,000, But its value is more than 1,000.
- the real part ⁇ , of the complex relative permittivity is as low as about 20, even at ⁇ .
- FIG. 5 is a diagram showing a change in the impedance ⁇ of the signal discriminator in each of the samples, where the impedance ⁇ is on the vertical axis and the frequency is on the horizontal axis.
- the frequency of the signal used is 1 MHz and the frequency of the noise to be removed is 10-500 MHz.
- the impedance characteristics of 3 are significantly lower than those of other samples. This is because the specific resistance pV of the Mn-Zn-based sample is low, and the real part ⁇ 'of the complex relative permittivity at 1 KHz is 100,000 or more, and the value is about 2,000 even at 1 MHz. Yes, and even 1 mm, its value is more than 1,000.
- FIG. 6 is a diagram showing impedance ⁇ of the sample 1 separated into a reactance component X 2 and a resistance component R. As is evident from Fig. 6, the X-R crosspoint frequency of sample 1: XR2 is approximately 5 MHz. The characteristics of Sample 2, not shown, are also substantially the same as in FIG.
- FIG. 7 is a diagram illustrating the impedance of the sample 4 separated into a reactance component X1 and a resistance component R.
- the X—R crosspoint frequency XR 1 of Sample 4 is about 10 MHz, which is the same as the conventional one.
- the X-R cross-point frequency XR2 of Samples 1 and 2 is 5 MHz, as described above with reference to FIG. 4, in Samples 1 and 2 at 1 kHz, the real part ⁇ ′ of the complex relative permittivity. Is more than 10,000, but the real part ⁇ 'of the complex relative permittivity decreases from about 5 KH ⁇ , and the value is about 30 at 1 MHz.
- a signal discriminator that forms a closed magnetic circuit with a soft magnetic material, penetrates a cable through the closed magnetic circuit, passes an electric signal flowing through the cable, and blocks a noise signal.
- the complex relative permittivity of the soft magnetic material varies with frequency, and the real part of the complex relative permittivity is larger in the low frequency region than the frequency of the electric signal flowing through the cable, and in the high frequency region. Since it is small, it is possible to suppress the noise component and obtain a signal discriminator that passes the signal component.
- the frequency of the signal used is 1 MHz
- the frequency of the noise to be removed is 10 to 500 MHz
- the X-R cross point frequency is 10 MHz or less. It is possible to obtain a low-cost signal discriminator that has no insulation, has good insulation, and can discriminate between signal and noise.
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2003/012043 WO2005029516A1 (ja) | 2003-09-22 | 2003-09-22 | 信号弁別器 |
EP03816836A EP1544875A1 (en) | 2003-09-22 | 2003-09-22 | Signal discriminator |
US10/511,308 US20050162234A1 (en) | 2003-09-22 | 2003-09-22 | Signal discriminator |
CNA038132273A CN1695213A (zh) | 2003-09-22 | 2003-09-22 | 信号辨别器 |
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PCT/JP2003/012043 WO2005029516A1 (ja) | 2003-09-22 | 2003-09-22 | 信号弁別器 |
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WO2005029516A1 true WO2005029516A1 (ja) | 2005-03-31 |
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PCT/JP2003/012043 WO2005029516A1 (ja) | 2003-09-22 | 2003-09-22 | 信号弁別器 |
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US (1) | US20050162234A1 (ja) |
EP (1) | EP1544875A1 (ja) |
CN (1) | CN1695213A (ja) |
WO (1) | WO2005029516A1 (ja) |
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CN100468930C (zh) * | 2006-03-17 | 2009-03-11 | 鸿富锦精密工业(深圳)有限公司 | 抗电磁干扰电源滤波器的磁珠选择方法 |
JP5987686B2 (ja) * | 2012-12-28 | 2016-09-07 | 日立金属株式会社 | ワイヤハーネス |
JP5920209B2 (ja) * | 2012-12-28 | 2016-05-18 | 日立金属株式会社 | ワイヤハーネス |
RU2523932C1 (ru) * | 2013-05-27 | 2014-07-27 | Корпорация "САМСУНГ ЭЛЕКТРОНИКС Ко., Лтд." | Плоская катушка индуктивности с повышенной добротностью |
US9570222B2 (en) * | 2013-05-28 | 2017-02-14 | Tdk Corporation | Vector inductor having multiple mutually coupled metalization layers providing high quality factor |
US9324490B2 (en) | 2013-05-28 | 2016-04-26 | Tdk Corporation | Apparatus and methods for vector inductors |
US9735752B2 (en) | 2014-12-03 | 2017-08-15 | Tdk Corporation | Apparatus and methods for tunable filters |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6441202A (en) * | 1987-08-06 | 1989-02-13 | Mitsubishi Petrochemical Co | Cable shielding bead |
JPH05283223A (ja) * | 1992-04-03 | 1993-10-29 | Mitsubishi Electric Corp | 信号弁別器 |
JP3108804B2 (ja) * | 1998-08-19 | 2000-11-13 | ミネベア株式会社 | Mn−Znフェライト |
JP3108803B2 (ja) * | 1998-08-19 | 2000-11-13 | ミネベア株式会社 | Mn−Znフェライト |
JP2003282318A (ja) * | 2002-03-22 | 2003-10-03 | Minebea Co Ltd | 信号弁別器 |
JP2003324014A (ja) * | 2002-04-30 | 2003-11-14 | Minebea Co Ltd | ビーズコア型ノイズフィルタ |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5990417A (en) * | 1993-06-07 | 1999-11-23 | Nippon Telegraph And Telephone Corporation | Electromagnetic noise absorbing material and electromagnetic noise filter |
-
2003
- 2003-09-22 US US10/511,308 patent/US20050162234A1/en not_active Abandoned
- 2003-09-22 CN CNA038132273A patent/CN1695213A/zh active Pending
- 2003-09-22 EP EP03816836A patent/EP1544875A1/en not_active Withdrawn
- 2003-09-22 WO PCT/JP2003/012043 patent/WO2005029516A1/ja not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6441202A (en) * | 1987-08-06 | 1989-02-13 | Mitsubishi Petrochemical Co | Cable shielding bead |
JPH05283223A (ja) * | 1992-04-03 | 1993-10-29 | Mitsubishi Electric Corp | 信号弁別器 |
JP3108804B2 (ja) * | 1998-08-19 | 2000-11-13 | ミネベア株式会社 | Mn−Znフェライト |
JP3108803B2 (ja) * | 1998-08-19 | 2000-11-13 | ミネベア株式会社 | Mn−Znフェライト |
JP2003282318A (ja) * | 2002-03-22 | 2003-10-03 | Minebea Co Ltd | 信号弁別器 |
JP2003324014A (ja) * | 2002-04-30 | 2003-11-14 | Minebea Co Ltd | ビーズコア型ノイズフィルタ |
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US20050162234A1 (en) | 2005-07-28 |
EP1544875A1 (en) | 2005-06-22 |
CN1695213A (zh) | 2005-11-09 |
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