Which techniques are adopted for the purpose of inductor designing in switching regulators ?

Which techniques are adopted for the purpose of inductor designing in switching regulators ?

a. Silicon Steel EI butt stacks
b. Ferrite EI, U & toroid cores
c. Powdered permalloy toroids
d. All of the above

Correct Answer : d. All of the above

Explanation :

Silicon steel EI butt stack method shows better permeability & high flux density along with the simplicity in construction phase. So, it is wide used in low-voltage switching regulators. Ferrite EI, U & toroid cores exhibits lower performance in the aspects of permeability, high temperature & expensive to greater extent. Powdered permalloy toroids possess are highly permeable with lower values of leakage inductance & losses. Due to this, they offer maximum stability & predictability but are very expensive similar to that of ferrite EI, U & toroid cores. However, all these mechanisms are adopted as per the requirement of desired application of switching regulator.