What is a Power Inductor?
What is a Power Inductor? A power inductor , sometimes referred to as an inductor coil or choke inductor, is a passive electronic component made of wire wound around a ferrite core with an air gap. It is primarily used to smooth or filter the output of high-frequency switching power supplies. Choosing a suitable inductor involves more than simply selecting an inductance value. To ensure reliable performance within a circuit, several key specifications must be evaluated. Power inductors are generally classified based on factors such as: DC resistance Tolerance Package dimensions Nominal inductance Packaging type Shielding method Maximum rated current Inductor Construction and Operation An inductor is defined by its structure and the materials used. It is created by winding insulated copper wire into a coil around a core material, often ferrite, resulting in a two-terminal passive component. When current passes through the coil, a magnetic field forms, and an electromotive ...