Common magnetic core magnetic ring

Iron powder core series

   The materials are: -2 material (red/transparent), -8 material (yellow/red), -18 material (green/red), -26 material (yellow/white), -28 material (gray/green), -33 Material (gray/yellow), -38 material (gray/black), -40 material (green/yellow), -45 material (black), -52 material (green/blue); size: outer diameter from 30 to 400D (Note: The outer diameter ranges from 7.8mm to 102mm).

Sendust series

   The main u values ​​are: 60, 75, 90, 125; Dimensions: the outer diameter ranges from 3.5mm to 77.8mm.

 

 

In addition to the main ring, the specifications of the two products are also E-shaped, rod-shaped, etc., and can also be customized according to the various parameters provided by the customer. They are widely used in computer motherboards, computer power supplies, power supplies, mobile phone chargers, lighting transformer dimmers, uninterruptible power supplies (UPS), various household appliances control panels, etc.

 

Seven, the connection and difference between inductance and magnetic beads

 

What is the connection and difference between inductance and magnetic beads

   1. Inductance is an energy storage element, and magnetic beads are energy conversion (consumption) devices

   2. Inductors are mostly used in power filter circuits, and magnetic beads are mostly used in signal circuits for EMC countermeasures.

   3. Magnetic beads are mainly used to suppress electromagnetic radiation interference, while inductance is used in this area to focus on suppressing conductive interference. Both can be used to deal with EMC and EMI issues.

   There are two ways of EMI, namely: radiation and conduction. Different ways use different suppression methods. The former uses magnetic beads and the latter uses inductors.

 4. Magnetic beads are used to absorb ultra-high frequency signals. For example, some RF circuits, PLLs, oscillating circuits, and ultra-high frequency memory circuits (DDR SDRAM, RAMBUS, etc.) need to add magnetic beads to the power input part, and the inductance is a This kind of energy storage element is used in LC oscillating circuit, medium and low frequency filter circuit, etc., and its application frequency range rarely exceeds 50MHZ.

   5. Inductance is generally used for circuit matching and signal quality control. General connection and power connection.

   Use magnetic beads where analog ground and digital ground are combined. Magnetic beads are also used for signal lines.

   The size of the magnetic bead (specifically, the characteristic curve of the magnetic bead) depends on the frequency of the interference wave that the magnetic bead needs to absorb. The magnetic bead is to block high frequency, low resistance to DC, high resistance to high frequency. For example, 1000R@100Mhz means that there is a resistance of 1000 ohms for a signal with a frequency of 100M. Because the unit of the magnetic bead is nominally based on the impedance it generates at a certain frequency, the unit of impedance is also ohms. The datasheet of the magnetic bead is usually accompanied by a characteristic curve of frequency and impedance. Generally, 100MHz is used as the standard, such as 2012B601, which means that the Impedance of the magnetic beads is 600 ohms at 100MHz.