What is the role of magnetic ring inductors in switching power supplies?

Switching power supply is very common in our life, such as lighting circuits to convert the household 220V voltage into lighting lamps with 48V or 24V voltage, power chargers, etc. The work of switching power supply is inseparable from the support of driver chips, resistors, capacitors, Inductors, of which the role of Magnetic Ring Inductor is very important.

What is the role of magnetic ring inductor in switching power supply?

Magnetic ring inductor is a property of closed circuit, in layman's terms, is to pass DC block AC, resistance to changes in current, in high power switching power supply, electromagnetic interference is more serious, in order to suppress electromagnetic interference, often using common mode magnetic ring inductor, common mode magnetic ring inductor two windings with the same in and out, the same number of turns, switching power supply on the moment of power, there is a strong AC current over, at this time the magnetic ring inductor can suppress the changes The moment the switching power supply is turned on, there is a strong AC current over, at this time the magnetic ring inductor can suppress the change of AC current over, making the current more smooth and stable.