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Overview of Power Inductors Power inductors are used to store energy, provide lower signal losses, filter EMI noise, and yield lower core losses in applications where voltage conversion is necessary. Before you can gain a good understanding of power inductors, it’s important to first familiarize yourself with the larger category of inductors. What Are Inductors? To understand inductors as a whole, you need a basic knowledge of magnetism and a few fundamental electromagnetic field laws. You can learn more about the basic principles of inductive components in our Trilogy of Magnetics design guide.

Basically, an inductor is a passive electrical component with two terminals that store energy in their magnetic field. Inductors are designed to create inductance for conductors. Generally, inductors are wrapped around a core material (such as iron) to increase inductance.

There are many different types of inductors, including multilayer inductors, RF inductors, toroid inductors, wire-wound inductors, and, of course, power inductors. What Are Power Inductors? A power inductor is an electronic component that both receives and stores electrical energy by using a magnetic field (usually created with a tightly coiled conductive wire). Power inductors serve to maintain a steady current in an electrical circuit with a varying current and/or voltage. Install Libusb Compat Ubuntu Desktop there.

With switched-mode power supplies becoming increasingly common, semiconductor manufacturers have begun offering a wide range of power inductors with simplified circuit design. To fully utilize the advantages of switching regulators, you should take care in selecting the appropriate storage choke.

Power inductors can be differentiated using criteria such as inductance, DCR, rated current, saturation current, and frequency range. They can also be categorized by type (see “Types of Power Inductors” below). Applications of Power Inductors The applications of power magnetics in general are vast and varied: • Filter circuits • Audio circuitry • Video circuitry • Interfaces • RF circuits • Motor control units • SMPS basics circuits • Mains filters • Power supply The smaller subset of power inductors has more specific applications. There are three main applications of power inductors: • Conducted EMI noise filters in AC inputs • Low-pass frequency noise filters for low-frequency ripple current noise • Energy storage in DC/DC converters. Types of Power Inductors While there are several types of power inductors, they can be divided into three main categories: flatwire inductors, coupled inductors, and compact SMD power inductors. Flatwire Inductors Flatwire inductors use a flat wire inside the choke in place of the conventional round wire. There are several advantages of flatwire inductors: • Large wire surface (thus low high-frequency losses) • Low winding capacity (thus high self-resonant frequency) • Low DC resistance (thus low self-heating at high prolonged currents) • High packing density (thus smaller component size than comparable chokes with round wire) • High operating temperature (up to max.

150°C) The are great inductors for high performance and low wire losses. It comes in two different sizes and is optimized for power supplies running high switching frequencies. Coupled Inductors Coupled inductors consist of two discrete inductors that are magnetically coupled.