Download>Subject> Selected Component Knowledge (9) -- Magnetic Bead Knowledge from Beginner to Master

Selected Component Knowledge (9) -- Magnetic Bead Knowledge from Beginner to Master

Recently, EEWORLD has produced a collection of the essence of various component application technologies. This series of collections carefully organizes the characteristics, application circuits, selection, detection and other applications of commonly used components such as resistors, capacitors, inductors, diodes, transistors, thyristors, field effect transistors, etc., so that everyone can start from the components and master electronic circuit design step by step. Speaking of magnetic beads, many people may not be familiar with them, which is no wonder, because magnetic beads are less used, but in terms of anti-interference of electronic circuits, magnetic beads play a very important role. This collection starts with the working principle of magnetic beads, covers the selection of magnetic beads, practical circuits, and the differences and connections between magnetic beads, inductors, and 0 ohm resistors.

Document List

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Introduction of magnetic beads
Points it Requires : 1 Type:Application DocumentsUploader:huhuhah0009Date:2013-09-29
Introduction: Magnetic beads [Repost] What are magnetic beads and the principles and applications of magnetic beads Classification: Hardware What are magnetic beads Magnetic beads have high resistivity and permeability. They are equivalent to resistors and inductors in series, but the resistance and inductance values ​​vary with frequency. They have better high-frequency filtering characteristics than ordinary inductors, and are resistive at high frequencies, so they can maintain high impedance in a fairly wide frequency range, thereby improving the FM filtering effect. As a power supply filter, an inductor can be used. The circuit symbol of the magnetic bead is an inductor, but the model shows that a magnetic bead is used. In terms of circuit function, the magnetic bead and the inductor are the same in principle, but the frequency characteristics are different. The magnetic bead is composed of an oxygen magnet, and the inductor is composed of a magnetic core and a coil. The magnetic bead converts the AC signal into heat energy, and the inductor stores the AC and releases it slowly. Magnetic beads have a greater blocking effect on high-frequency signals. The general specifications are 100 ohms/100mMH Z. Its resistance is much smaller than that of the inductor at low frequencies. Ferrite beads are a type of anti-interference component that is currently developing rapidly. They are cheap, easy to use, and effective in filtering out high-frequency noise. In a circuit, as long as the wire passes through it (……
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EMC beads (very good)
Points it Requires : 1 Type:Application DocumentsUploader:常见泽1Date:2013-03-17
Introduction:EMC beads are worth a look
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The difference between inductors and magnetic beads and their applications and functions
Points it Requires : 1 Type:Application DocumentsUploader:雪人001Date:2013-06-18
Introduction:The difference between inductors and magnetic beads and their application occasions and functions. Magnetic beads are composed of oxygen magnets, and inductors are composed of magnetic cores and coils. Magnetic beads convert AC signals into heat energy, and inductors store AC and release it slowly. Magnetic beads have a greater blocking effect on high-frequency signals. The general specifications are 100 ohms/100mMHZ. Its resistance is much smaller than that of inductors at low frequencies. The equivalent resistance of inductors can be obtained by Z=2X3.14xf. Ferrite beads (Ferrite Bead) are a kind of anti-interference component with rapid application development. They are cheap, easy to use, and have a significant effect in filtering high-frequency noise. In the circuit, as long as the wire passes through it (I use those that look like ordinary resistors, the wires have been passed through and glued, and there are also surface mount forms, but they are rarely sold). When the current passes through the wire, the ferrite has almost no impedance to the low-frequency current, but it will have a greater attenuation effect on the higher frequency current. High-frequency current is dissipated in the form of heat, and its equivalent circuit is an inductor and a resistor in series, and the values ​​of the two components are proportional to the length of the magnetic bead. There are many types of magnetic beads, and the manufacturer should provide technical indicators, especially the curve of the impedance and frequency relationship of the magnetic beads. Some magnetic beads have multiple holes, and passing a wire through them can increase the component impedance (the square of the number of times the magnetic beads are passed through), but the increased noise suppression ability at high frequencies may not be as much as expected, and it would be better to connect more magnetic beads in series. Ferrite is a magnetic material, which will produce magnetic saturation due to excessive current passing through, and the magnetic permeability will drop sharply. High current filtering should use magnetic beads specially designed in structure, and attention should also be paid to its heat dissipation measures. Ferrite beads can not only be used to filter high-frequency noise in power supply circuits (can be used for DC and AC output), but can also be widely used in other circuits, and their size can be made very small. Especially in digital circuits, since pulse signals contain high-frequency high-order harmonics, which are also the main source of high-frequency radiation in circuits, magnetic beads can play a role in this occasion. Ferrite beads are also widely used in noise filtering of signal cables. Taking HH-1H3216-500, which is commonly used for power supply filtering, as an example, the meanings of the various fields of its model are as follows: HH is one of its series, mainly used for power supply filtering, and the HB series is used for signal lines; 1 means that a component encapsulates a magnetic bead, and if it is 4, four beads are encapsulated side by side; H represents the constituent materials, H, C, and M are medium frequency applications (50-200MHz), T is low frequency applications (<50MHz), and S is high frequency applications (>200MHz); 3216 is the package size, 3.2mm long and 1.6mm wide, that is, 1206 package; 500 is the impedance (generally at 100MHz), 50 ohm. There are three main product parameters: Impedance [Z]@100MHz (ohm): Typical 50, Minimum 37; DC Resistance (m ohm): Maximum 20; Rated Current (mA): 2500. Magnetic beads have high resistivity and permeability. They are equivalent to resistors and inductors in series, but the resistance and inductance values ​​vary with frequency. They have better high-frequency filtering characteristics than ordinary inductors. They are resistive at high frequencies, so they can maintain high impedance in a fairly wide frequency range, thereby improving the FM filtering effect. Magnetic beads are mainly used for high-frequency isolation, suppression of differential mode noise, etc.
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The principle and function of magnetic beads
Points it Requires : 1 Type:OthersUploader:hctoofdDate:2017-04-30
Introduction:The role of magnetic beads. How to use magnetic beads
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The difference between magnetic beads and inductors - information summarized by others, the basic knowledge is very good, a small collection of 1RD
Points it Requires : 1 Type:Application DocumentsUploader:nkyqslDate:2013-09-29
Introduction: The difference between magnetic beads and inductors The difference between magnetic beads and inductors 1. Inductors are energy storage components, while magnetic beads are energy conversion (consumption) devices. Inductors are mostly used in power supply filter circuits, focusing on suppressing conducted interference; magnetic beads are mostly used in signal circuits, mainly for EMI. Magnetic beads are used to absorb ultra-high frequency signals. Some RF circuits, PLLs, oscillation circuits, and ultra-high frequency memory circuits (DDR, SDRAM, RAMBUS, etc.) all require magnetic beads to be added to the power input part, while inductors are energy storage components used in LC oscillation circuits, medium and low frequency filter circuits, etc., and their application frequency range rarely exceeds 50MHz. 2. The unit of magnetic beads is ohm, and the unit of inductance is hunter. 3. Magnetic beads have high resistivity and permeability. They are equivalent to resistors and inductors in series, but the resistance and inductance values ​​vary with frequency. They have better high-frequency filtering characteristics than ordinary inductors, and are resistive at high frequencies, so they can maintain a high impedance in a fairly wide frequency range, thereby improving the FM filtering effect. 4. As a power supply filter, you can use an inductor. The circuit symbol of the magnetic bead is an inductor, but the model number shows that a magnetic bead is used. In terms of circuit function, the magnetic bead and the inductor are based on the same principle, but the frequency characteristics are different. [pic] [pic] Impedance frequency characteristic curve of the inductor (poor suppression of high frequencies above 50MHz) Impedance frequency characteristic curve of the magnetic bead (good suppression of high frequencies) 5. The magnetic bead is composed of an oxygen magnet, and the inductor is composed of a magnetic core and a coil. The magnetic bead converts the AC signal into heat energy, and the inductor stores the AC and releases it slowly. The magnetic bead has a greater blocking effect on high-frequency signals. The general specifications are 100 ohms/100mMHZ. Its resistance is much smaller than that of the inductor at low frequencies. Ferrite beads (FerriteBead) are a kind of anti-interference component that is currently developing rapidly. They are cheap, easy to use, and have a significant effect in filtering high-frequency noise. In the circuit, just pass the wire through it (the ones I use are like ordinary resistors, with the wires passed through and glued. There are also surface mount forms, but they are rarely sold). When current flows through the wire, the ferrite reacts to low...
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Application of ferrite rings and ferrite beads in suppressing electromagnetic interference EMI
Points it Requires : 1 Type:Application DocumentsUploader:flexbuilderDate:2013-11-22
Introduction:Application of ferrite rings and ferrite beads in suppressing electromagnetic interference EMI
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Magnetic beads and their applications in switching power supplies.
Points it Requires : 1 Type:Application DocumentsUploader:anvy178Date:2013-03-20
Introduction:Magnetic beads and their applications in switching power supplies.
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Selection of inductors and magnetic beads
Points it Requires : 1 Type:Application DocumentsUploader:西北望射天狼Date:2012-12-19
Introduction:Inductive components and EMI filter components are widely used in the PCB circuits of electronic devices. These components include chip inductors and chip magnetic beads. The following describes the characteristics of these two devices and analyzes their common and special applications.
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Let you thoroughly understand the difference and application of 0 ohm resistors, magnetic beads and inductors
Points it Requires : 1 Type:Application DocumentsUploader:电子爱好者IKDate:2014-03-05
Introduction:Let you thoroughly understand the difference and application of 0 ohm resistors, magnetic beads and inductors
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EMC&EMI The difference between magnetic beads and inductors
Points it Requires : 1 Type:Application DocumentsUploader:欣之Date:2013-09-07
Introduction:This document mainly introduces the differences between magnetic beads and inductors, and their applications in EMC&EMI.
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High Current Magnetic Bead Application Notes
Points it Requires : 1 Type:Application DocumentsUploader:lamasDate:2014-03-05
Introduction:High current magnetic beads application instructions, magnetic devices, the secrets you must know!
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What are magnetic beads and their principles and applications?
Points it Requires : 1 Type:Application DocumentsUploader:frogluckyDate:2013-09-29
Introduction: Principle of magnetic beadsWhat are magnetic beads?Magnetic beads have high resistivity and permeability. They are equivalent to resistors and inductors in series, but the resistance and inductance values ​​vary with frequency. They have better high-frequency filtering characteristics than ordinary inductors. They are resistive at high frequencies, so they can maintain high impedance in a fairly wide frequency range, thereby improving the FM filtering effect. As a power supply filter, an inductor can be used. The circuit symbol of a magnetic bead is an inductor, but the model shows that a magnetic bead is used. In terms of circuit function, magnetic beads and inductors are based on the same principle, but with different frequency characteristics. Magnetic beads are composed of oxygen magnets, and inductors are composed of magnetic cores and coils. Magnetic beads convert AC signals into heat energy, and inductors store AC and release it slowly. Magnetic beads have a greater blocking effect on high-frequency signals. The general specifications are 100 ohms/100mMHZ. Its resistance is much smaller than that of inductors at low frequencies. Ferrite beads (Ferrite Bead) are a kind of anti-interference component that is currently developing rapidly. They are cheap, easy to use, and have a significant effect in filtering high-frequency noise. In the circuit, as long as the wire passes through it (the ones I use are like ordinary resistors, the wires have been passed through and glued, and there are also surface mount forms, but they are rarely sold). When the current passes through the wire, the ferrite has almost no impedance to the low-frequency current, but it will have a greater attenuation effect on the higher frequency current. The high-frequency current is dissipated in the form of heat, and its equivalent circuit is an inductor and a resistor in series, and the values ​​of the two components are proportional to the length of the magnetic bead. There are many types of magnetic beads, and the manufacturer should provide technical indicators, especially the curve of the impedance and frequency relationship of the magnetic beads. Some magnetic beads have multiple holes, and passing them through can increase the impedance of the component (the square of the number of times the magnetic beads are passed through), but the increased noise suppression ability at high frequencies may not be as much as expected, and it would be better to use more magnetic beads in series. Ferrite is a magnetic material, which will produce magnetic saturation due to excessive current passing through, and the magnetic permeability will drop sharply. High current filtering should use magnetic beads specially designed in structure, and pay attention to its heat dissipation measures. Ferrite beads can not only be used to filter high-frequency noise in power supply circuits (can be used for DC and AC output), but can also be widely used in other circuits, and their volume can be made very small. Especially in digital circuits, due to the pulse...
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How to select Ferrite Bead
Points it Requires : 1 Type:Technical DocumentationUploader:空气Date:2013-08-13
Introduction:How to select Ferrite Bead
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Completely free to enjoy: Principle and selection guide of magnetic ring and magnetic bead
Points it Requires : 1 Type:Application DocumentsUploader:电子爱好者IKDate:2013-09-29
Introduction: 2005914172625202application note Philips Magnetic ProductsCable ShieldingPhilips Components Cable ShieldingContentsIntroduction EMI suppression and cable shielding with ferrites Ferrite selection Material properties Ferrite core and its impedance behaviour Ferrite location Impedance concept Attenuation concept Product range 34 6 7 11 12 13 16 171Philips Magnetic Products Our range of ferrite cable shields2Philips Magnetic Products IntroductionElectromagnetic interference problems can arise anywhere since electromagnetic energy can unpredictably couple into systems, producing unwanted effects. Electromagnetic interference occurs when three elements come together: a source of interference a receiver of the interference a path of transfer. According to this simple scheme, minimizing ……
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Reject ambiguity - inductors and magnetic beads
Points it Requires : 1 Type:Application DocumentsUploader:hellopinkgirlsDate:2013-09-29
Introduction: Reject ambiguity - inductors and magnetic beads, reject ambiguity - inductors and magnetic beads...

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