Inductor with thermally stable resistance
View Patent ↗An inductor includes an inductor body having a top surface and a first and second opposite end surfaces. There is a void through the inductor body between the first and second opposite end surfaces. A thermally stable resistive element positioned through the void and turned toward the top surface to forms surface mount terminals which can be used for Kelvin type sensing. Where the inductor body is formed of a ferrite, the inductor body includes a slot. The resistive element may be formed of a punched resistive strip and provide for a partial turn or multiple turns. The inductor may be formed of a distributed gap magnetic material formed around the resistive element. A method for manufacturing the inductor includes positioning an inductor body around a thermally stable resistive element such that terminals of the thermally stable resistive element extend from the inductor body.
1. An inductor comprising:
a thermally stable resistive element;
an inductor body having a top surface and first and second opposite end surfaces;
the inductor body comprising a distributed gap magnetic material pressed over the thermally stable resistive element;
wherein opposite ends of the resistive element are each turned along outer sides of the first and second opposite end surfaces toward the top surface of the inductor body and have ends that overlap the top surface of the inductor body to form opposite surface mount terminals, each surface mount terminal including a larger terminal for current carrying and a smaller terminal for Kelvin-type current sensing.
2. The inductor of claim 1 wherein the thermally stable resistive element is formed of a non-ferrous metallic alloy.
3. The inductor of claim 1 wherein the thermally stable resistive element comprises a non-ferrous metallic alloy comprising nickel and copper.
4. The inductor of claim 1 wherein the thermally stable resistive element comprises iron, chromium, and aluminum.