Welcome to Chipmall.com
Products
View All Products
Home > News > News detail

Common-mode inductors commonly used core types

163.com | 24/04/2021

For most products, ferrite (nickel-zinc series and manganese-zinc series) are used for the core of common mode inductors. Nickel-zinc cores are characterized by low initial permeability, but they can still maintain initial permeability at very high frequencies (greater than 100MHz). On the other hand, the manganese-zinc system has a very high initial permeability, but at a very low frequency (20KHz), the permeability may decay. Because the nickel-zinc core has a very low initial permeability, it cannot produce high impedance characteristics at low frequencies. However, Mn-Zn magnetic cores can provide very high impedance characteristics at low frequencies, and are very suitable for anti-electromagnetic interference from 10KHz to 50MHz. Based on this, we mainly focus on manganese-zinc cores today to reveal the most commonly used core types for common mode inductors.

Manganese-zinc cores come in many shapes: ring, E-shaped, pot-shaped, RM-shaped, EP-shaped, and so on. But for most common mode inductors, toroidal cores are used. The main reasons are as follows:

First: The price of toroidal cores is relatively cheap. Because only one ring can be made, and other shapes of cores need a pair to form the common mode inductance, and during the molding, due to the pairing of the two cores, it is necessary to increase the grinding process (such as mirror cores). ) In order to get a higher magnetic permeability. This is not necessary for toroidal cores.

Second: The toroidal core has a higher effective permeability compared with the cores of other shapes. Because the air gap phenomenon cannot be eliminated no matter how the two paired magnetic cores are assembled, the effective magnetic permeability is lower than that of a single closed magnetic core.

However, the toroidal core has a disadvantage: the winding cost is relatively high. Because other shapes of magnetic cores have a matching wire rack in use, winding can be machine-operated, while toroidal cores can only be operated by hand or machine (lower speed). But under normal circumstances, the number of common-mode inductor turns is less (less than 30 turns), so the winding cost is relatively low.

Tags

Common Mode Chokes

Topic
News Homepage
News detail

Brands

Cross News

1. Common-mode inductors commonly used core types

Common-mode inductors commonly used core types

2. Modular power supplies offer up to 18 outputs with...

Modular power supplies offer up to 18 outputs with low acoustic noise and full MoPPs isolation

3. Smart storage includes an open-source toolkit for ...

Smart storage includes an open-source toolkit for managing data centre storage

4. Power MOSFETs offer high power density and efficiency

Power MOSFETs offer high power density and efficiency

5. Sensor modules provide long range presence and pro...

Sensor modules provide long range presence and proximity sensing for light curtain applications

6. AMD Achieves 25x Energy Efficiency Goal from 2014

AMD Achieves 25x Energy Efficiency Goal from 2014

7. Podcast: DAC 2020 preview – AI, ML and RISC-V on rise

Podcast: DAC 2020 preview – AI, ML and RISC-V on rise

8. New touchscreen controller for smart surfaces and ...

New touchscreen controller for smart surfaces and multi-function displays

9. Intel to Introduce Control-Flow Enforcement Techno...

Intel to Introduce Control-Flow Enforcement Technology into Tiger Lake Mobile CPUs

10. What do AI users predict for its future?

What do AI users predict for its future?

Connect with us
Email error
©2022 Chipmall Electronics Limited. All Rights Reserved.    Sitemap
We use cookies to offer you a better experience. Detailed information on the use of cookies on this website is provided in our Privacy Policy. By using this site, you consent to the use of our cookies.
Accept