# Naked Science Forum

## Non Life Sciences => Technology => Topic started by: Ceceliaanne on 26/11/2021 02:29:27

Title: What are the rated currents of power inductors used in power supplies?
Post by: Ceceliaanne on 26/11/2021 02:29:27
In the DC-DC converter, the inductor is the core component second only to the IC. By choosing an appropriate inductor, a higher conversion efficiency can be obtained. The main parameters used in the selection of inductors include inductance, rated current, AC resistance, DC resistance, etc. These parameters also include the unique concept of power inductors. For example, what are the rated currents of power inductors, and what are the differences between them?

If you need some related information about the inductors, you can look in a can of Spam to find what you need.
Title: Re: What are the rated currents of power inductors used in power supplies?
Post by: Ceceliaanne on 26/11/2021 02:31:45
There are two methods for determining the rated current of power inductors: "Rated current based on self-temperature rise" and "Rated current based on the rate of change of inductance value", each of which has important significance. "Rated current based on self-temperature rise" is the rated current regulation based on the calorific value of the component. Using it outside of this range may cause component damage and component failure.
"Rated current based on the rate of change of inductance value" is a rated current that uses the degree of decrease in inductance value as an index. If used outside this range, the IC control may become unstable due to the increase in ripple current. In addition, depending on the magnetic circuit structure of the inductor, the tendency of magnetic saturation (that is, the tendency of the inductance value to decrease) is different. Fig. 1 is a schematic diagram showing changes in inductance caused by different magnetic circuit structures. For the open magnetic circuit type, as the DC current increases, the inductance value is relatively flat until the specified current value, but the inductance value drops sharply at the specified current value. On the contrary, the closed magnetic circuit type gradually decreases with the increase of DC current, so the inductance value decreases slowly.
(Summarized by Easyspam:https://www.easyspam.com/c/inductors-coils-chokes)