Design of iron powder core filter inductor
DesignofChokeUsingIronPowderCores
Abstract:
The design of filter inductor (choke) must be considered to DC magnetization. The iron powder core has high saturation magnetic flux density, small impact of DC magnetization, and low expenditure. It is an ideal material. Introduce three choke coil design methods. Rwandans Escorte
1 Introduction
Common filter inductors mainly include: common mode filter inductors, Differential mode filter inductor and rectifier filter inductor. The first two inductors are mainly used in various line filters and work in traffic conditions. The latter one is used to filter out the rectified traffic ripple and make the rectified DC part straighter. Because it works under DC conditions, the impact of DC magnetization on the inductance has to be considered.
In the past, electronic equipment, such as those using electron tubes, had mostly high voltage and low current rectifier outputs. Today’s electronic equipment using transistors and integrated circuits mostly have low voltage and high current. Since the DC magnetizing force is inversely proportional to the magnitude of the current, more attention must be paid to the impact of DC magnetization on the inductance. This requires that the filter inductor must adapt to high current conditions. Therefore, Rwanda Sugar chooses what kind of material to make the magnetic core. How to design the filter coil well, reduce the influence of DC magnetization, and avoid core saturation has to become an issue worthy of attention.
2 Regarding the characteristics of constant magnetic permeability or constant inductance
The rectifier filter inductor works under a large DC current condition, and the change in the working current causes the change in the inductance value to be as small as possible. That is to say, the DC magnetization of the magnetic core is required to have a small impact, that is, it has some constant magnetic permeability characteristics. Due to the influence of DC magnetization, the inductance tends to be saturated, and the inductance will decrease as the operating current increases. According to the resonance of the master, the so-called constant magnetic conductance characteristics can also be calledIt is a constant inductance characteristic, which means that the inductance of the inductor is not less than half of the initial inductance within a certain DC magnetizing force range. Mastering this feature, we can achieve different percentage requirements by selecting different magnetic cores and different specifications.
3 Selection of core materials
When making filter inductors and choosing which core material to use, in addition to paying attention to avoid core saturation problems, the constant magnetic permeability characteristics of the core must also be taken into consideration. It needs to be pointed out that some designers often only pay attention to the indicator of inductance and choose materials with high magnetic permeability to reduce the number of turns of the coil. When the rated current of the inductor is large, whether the inductance can be reduced and to what extent? Whether it will reach saturation is a small consideration. This should be avoided.
Table 1 lists a comparison of the constant magnetic permeability characteristics of some core materials for reference when selecting. The constant magnetic permeability range mentioned in the table Rwanda Sugar Daddy means that within this DC magnetizing force range, the magnetic permeability will not be low. at 50%. Reducing the DC magnetizing force corresponds to a percentage increase in magnetic permeability. Table 2 shows the percentage of magnetic permeability of an iron powder core with a magnetic permeability of 75 when the DC magnetizing force is different.
Table 1 Comparison of some core materials and constant magnetic permeability characteristics
4 Relevant calculation formulas
Table 3 Iron powder core (data 26) Characteristic parameter table
AL (nH/N2) So (mm2)
In order to better design the inductor and meet the constant magnet requirements, you need to be proficient in some magnetic formulas and Understand some necessary magnetic knowledge.
The DC magnetizing force mentioned above can be calculated through (1):
H=0.4πRwanda SugarNI/lOe(1)
or H=NI/lA/cm(1′)
Here N is the number of coil turns; I is the current, The unit is Ampere (A); l is the uniform magnetic path length of the magnetic core, and the unit is centimeters (cm). Transform the above formula, then we have:
H/NI=0.4π/l or H/NI=1/l
For a ring-shaped core (the filter inductor is many Using an annular core), because
l=[(D+d)/2]×πcm
where D is the outer diameter, d is the inner diameter, unit centimeter (cm).
So, H/NI can be obtained in the following way, namely
H/NI=0.8/(D+d) or H/NI=1/(D+d)0.5π
For any size of ring core, an H/NI value can be obtained. Multiplying this value by the number of ampere turns is the DC magnetizing force, that is:
H=(H/NI)NIOe (or A/cm)
It can be seen that H/NI is proportional to l or (D+d). A large-sized core will have a small H/NI value. When the number of ampere-turns is certain, choosing a large-sized core will have a small H value and good constant magnetic permeability characteristics. It can also be said that under the premise of determining the H value, a large-sized magnetic core will have a larger ampere-turn number.
A few more formulas are listed below:
L=N2AL（nH/N2）nH(2)
N=[L（nH)/AL (nH/N2)]1/2 turns (3)
AL=L (nH)/N2nH/N2(4)
W(energy)=LI2/2J or Ws (5)
In this formula, the L unit is H and the I unit is A.
When the L unit is μH, then W is μJ or μWs. Substituting formula (2) into (6), it can also be Rwanda Sugarobtains a relationship:
W=LI2/2=N2ALI2/2=(NI)2AL/2(6)
In this formula, as AL takes nH/N2 value, then it is nJ. In order to make the result as μJ, the formula can be formed as:
W=(NI)2AL/2000μJ (6′)
5design methods and steps
Once you are familiar with the above formula, you still need the DC superposition characteristic curve provided by the magnetic core birth unit, and you can proceed with the design. Figure 1 shows the beautiful Rwandans Escort The curve provided by Guowei Metal Company is for design reference. During actual operation, design calculation can also be carried out based on the data provided in Table 2.
Rwandans Escort Because the iron powder core has high saturation magnetic flux density, good constant magnetic permeability characteristics and low price, and has been widely used. Therefore, the design methods and steps of this article are based on those who are loyal to me. Other materials only need to change the characteristic parameters, and there is not much difference.
Design basis: the inductance is 100μH, the additional current is 3A, and at the extra current, the inductance value must be less than 75μH. That is, the constant magnetic permeability characteristic is required to be 75%.
Introducing three design methods:
(1) Method 1: Use the constant magnetic permeability characteristic curve and the series product characteristic table (Table 3) for design.
Table 3 Iron powder core (data 26) characteristic parameter table
1) Looking at Figure 1 or Table 2, we can see that at 75% μo, H is 25Oe.
2) Calculate the ampere-turns from the H/NI value of the magnetic core in Table 3, that is:
H=(H/NI)NI transforms into NI=H/( H/NI)
Try to choose T9026, the H/NI value of this core is 0Rwandans Sugardaddy.2168.
NI=25/0.2168=115.3, take 115
Then use the number of ampere turns to find the number of turns
N=NI/I=115/3= 38.3, take 38
Calculate RW Escorts inductance, the AL value of the core is 70nH/N2
L=N2AL=382×0.07=101.1μH
Since this inductance is close to the required value, 38 can be the required number of turns. If the difference is large, calculate the actual number of turns according to formula (3).
3) Calculate the number of turns according to formula (3).
4) Calculate the DC magnetizing force.
NI=N×I=38×3=114
H=(H/NI)×NI=0.2168×114=24.7Oe
5) Check %μo, it can be seen from Figure 1 or Table 2 that 24.7Oe, %μo>75%, meets the requirements.
(2) Method 2: Calculated from the energy storage coefficient.
1) Calculate the energy storage coefficient according to formula (6):
W=LI2/2=100×32/2=450μJ
2) From W calculates the ampere-turns. Transform formula (6′) to get:
NI=[2000W/AL]1/2
Try to choose T9026, the AL value of this core is 70.
NI=[2000×450/70]1/2=113.4, take 113.
Calculate N from the number of ampere-turns.
N=NI/I=113/3=37.7, take 38
Calculate the inductance,
L=N2AL=382×0.07=101.1μH
The following steps are the same as method 1 and will not be listed again.
Both of the above methods require trial selection. If the trial selection is not possible, try a larger or smaller size depending on the situation until the requirements are met.
(3) Method 3: Use the two curves provided by the childbirth unit (see Figure 2, Figure 3) to find out the required magnetic core.
Based on the design: the inductance is 100μH, the extra current is 4A, and at the extra current, the inductance is not less than 75μH.
1) Calculate the energy storage coefficient. When calculating here, the required inductance is the value at the rated current, which is 75μH.
Calculate ampere-turns and inductance.
N=NI/I=130/4=32.5, take 33
L=332×0.093=101.3μH
This inductance is non-extra current time value.
The steps will be the same as before. Table 4 lists the maximum inductance of four commonly used specifications of iron powder cores at different currents under several μo conditions. When designing, by checking the table, you can determine what kind of magnetic core (the specifications of the iron powder core) to choose.
Table 5 lists the different amounts of RW Escorts external current. When the difference is %μo, it should not be greater than a certain When measuring the inductance, the core specifications can be selected.
Table 4 Inductance at different currents of four commonly used specifications of iron powder cores
T18426
Finally, it needs to be pointed out that method one 2. The calculated ampere-turns may sometimes be very large, which may not be possible in fact. Therefore, it is necessary to check the calculation according to the following formula.
NI=KSoJ(7)
In the formula, K is the window application coefficient, which is 0.4.
So is the core window area, the unit is mm2.
J is the current density, and the unit is A/mm2. Generally, 2~4A/mm2 is acceptable. As the current density increases, more turns can be wound, but the copper loss increases and the coil temperature decreases.
The right side of Table 3 lists the number of ampere turns the magnetic core can wind at different current densities as a reference.
6 Temperature rise calculation
(1) Calculate Bac
Bac=L△I×102/2AeN=
(75× 0.75×100)/2×0.395×38=187.4(GS)
(2) Calculate unit volume power consumption and iron loss
Pcore=6.94×10-10f1.36B2. 03(f:Hz,B:GS)
=6.94×10-10×(100×103)1.36×(187.4)2.03
=179.9mW/cm3
PFe=Pcore×Ve=179.9×2.28=410.2mw
(3) Calculate copper loss
Pcu=(N×l/N)×ρ×I2
I0=3A, application #19, 0.264mΩ per cm
Pcu=38×3.64×0.264×32=328.6mW
(4) Calculate the temperature Liter
△T=|(PFe+Pcu)/SA|0.833=|(410Rwanda Sugar.2＋328.6)/
22.4|0.833=18.4℃
This temperature rise It’s not too high, and it’s completely usable.
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Adjustable inductor The role of the adjustable inductor_how to adjust the adjustable inductor The adjustable inductor switch control connects a bidirectional thyristor switch in series with the inductor circuit, and changes the equivalent inductance size of the inductor by turning on and off the bidirectional thyristor. 2019-11-15 08:53:378474Why should we use inductors? In the circuit, different inductors are used for RF isolation. The different types of inductors used in these applications are identified and discussed. Why use inductors? Essentially, an inductor is a low-pass filter. At high frequencies, the inductor becomes a high-impedance component that can be used for RF isolation. High frequency cannot pass through the inductor, but 2021-05-15 17:30:202130
The principle of inductor structure and inductor Basic Rwanda Sugar Daddy distribution to friends Basic knowledge of inductor structure and principle of distribution to friends Electronic components that can produce inductance Both are called inductors, commonly known as coils. They are one of the commonly used basic electronic components RW Escorts. They have a single variety and different shapes. This article mainly explains what an inductor is and the structure principle of an inductor. We 2021-04-14 01:45:04
3374What is an inductor? What is the function of an inductor? What is an inductor? The function of an inductor. The inductor is also one of the basic components of the circuit and is widely used in electronic equipment. It has the function of passing DC in the circuit. Blocking traffic, passing low frequency and blocking high frequency (such as inductor filtering) is a component that stores magnetic field energy. In electronic technology and power systems 2021-04-21 14:51:21
4978 Inductor Performance and Uses Inductors are various types of coils wound with insulated wires called inductors. The wires are wound into one or more turns to Electronic components that generate a certain amount of self-inductance are often called inductors or simply coils. Inductors are widely used in electronic circuits and are one of the important components to achieve oscillation, tuning, coupling, filtering, delay, and deflection. 2021-04-22 11:25:165117 What is an inductor? Summary of common common sense about inductors. What is an inductor? Inductors are rare. Summary of common knowledge Summary of common knowledge about inductors – Type 1. Vertical sealed fixed inductors Vertical sealed fixed inductors use same-direction pins. The domestic inductance range is 0.1~2200μH (directly marked on the casing). The rated working current is 0.052021-04-27 17:12:40What role does the 3202 common mode inductor play in the circuit? The two sets of coils of the common mode inductor are wound on a magnetic ring with the same number of turns and the same direction. They are just one set of coils. Winding on the left side, another set of coils is wound on the right side. The common mode inductor uses high magnetic permeability manganese zinc ferrite or amorphous material to improve the performance of the common mode inductor in the circuit. ? 2021-04-28 09:38:42What are the detection methods of 1875 inductors? What are the digital multimeters to detect inductors? Method: Set the range switch of the digital multimeter to the appropriate inductance level; then connect the two pins of the inductor to the two test leads, and the inductance of the inductor will be displayed on the display. If the displayed inductance is the same. If the nominal inductance is close, it means that the inductor is normal; if the displayed inductance is much different from the nominal value, it means there is a problem with the inductor 2021-06-30 11:34:04
11024 Characteristics and Performance of Inductors Inductors (Inductors) are components that can convert electrical energy into magnetic energy and store it. The structure of the inductor Similar to a transformer, but only one winding has a certain inductance. It only blocks the change of current when the circuit is connected. 2021-06-30 11:59: 515094 FeSiAluminum Inductor KS068125A-1MH Vertical Pin Inductor Product Introduction Household Appliance Control Board. Magnetic cores are very suitable for energy storage filter inductors in switching power supplies. Compared with iron powder cores, iron-silicon aluminum performs better at low temperatures. In some applications, the use of iron-silicon aluminum cores is also smaller than iron powder cores. Small. The use of iron-silicon-aluminum cores can reduce the size of the online filter due to the required turns ratio2021-10-25 09:15:32
21 Rwanda Sugar Daddy What are the functions of the inductor in the circuit? It plays an important role in filtering and current limiting. , tuning, oscillation, interference suppression, and the effect of magnetic field; 2. The structure of the inductor. The inductor is generally composed of a skeleton, a winding, a shield, a packaging material, a magnetic core or a core, etc. 3. The unit of the inductor.The sum parameter inductor is represented by the symbol L. Its basic unit is Henry (H). The commonly used millihenry (mH) and microhenry (μH) are 2021-12-27 15:57:3210275 Magnetic Ring Inductor Having Children Store Popular Science What are the effects of too long pins of iron powder core magnetic ring inductors? Regarding the application of iron powder core magnetic ring inductors, I In the recent stage, I have shared with you a lot of inner things. In fact, there are still many issues surrounding the application of iron powder core magnetic toroid inductors that have not yet been explained. But don’t worry, we will continue to share knowledge about iron powder core magnetic toroid inductors with everyone. Here 2023-02-25 18:36:30198
Inductor moldRW Escorts and parameter introduction : The inductor is the main active component in parallel with the resistor R and capacitor C. It is sometimes also called a coil. Generally, the coil refers to the ring-shaped wire winding, and the coil in the circuit refers to the inductor. The symbol of the inductor is usually represented by “L”. This move is for commemoration 2023-05-31 17:27:412261
Third-Order High-Pass Filtering has Synthetic Inductors Inductors have a bad reputation as components of filters—they not only transmit EMI, also acts as an antenna to receive EMI. To avoid these problems, one can simulate the impedance of two operable combinations of an inductor, a transconductance amplifier (OTA), and a capacitor (Figure 1). This circuit acts as a decomposed inductor (LSYN) with one end connected to ground. 2023-06-10 10:54:24606
What is an inductor and how does it work? As mentioned before, an inductor is nothing more than a wire tightly wrapped around a magnetic core The core can be made of ferromagnetic material or plastic, or in some cases hollow (air). This relies on the principle of “magnetic flux growing around a current-carrying conductor”. You will become familiar with capacitors through 2023-06-18 10:19:39985
Why do inductors make noise? How to reduce the noise of inductors? Why do inductors make noise? How to reduce the noise of inductors? Inductors It is one of the common components in the circuit. It is used to store electrical energy, regulate voltage, filter, suppress interference, etc. However, when inductive devices are used in the circuit, noise may occur, affecting the normal operation of the circuit. Therefore, 2023- 09-14 11:00:092271 Performance and use of inductors in power supplies: Inductors can Used for power supply filtering and voltage stabilization. In the power supply, capacitors and inductors are combined to form a filter circuit. Through the filter circuit, the inductor can filter out the traffic electronic signals and only transmit the DC electronic signals. It can also be used in voltage stabilizing circuits to stabilize the input voltage by controlling the inductance value 2023-12-08 10:41:26
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