74456122

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Fixed Inductors

Fixed inductors are the type of inductors that have a predetermined inductance value and are designed for operation in a specific frequency range. These are generally used for both AC and DC operations. It is constructed by a wire winding with a core made of air, powdered iron, ferrite, or other magnetic materials. The winding of the inductor can be either with copper foil for low frequencies or with litz wire for high frequencies. Generally, the inductance value of the inductor is determined by the wound wire length and the core materials. The two main applications of the fixed inductors are as follows:

74456122 Application Field

• Switching Power Supplies: Fixed inductors are widely used in switching power supplies for regulating and controlling the voltage level of the power supply. The inductor helps in the smoothing of the output voltage and current. It also provides a low impedance path to switch currents during transitions and helps to reduce switching losses in the circuit.
• Decoupling Applications: Decoupling applications require a certain amount of inductance to create a low impedance path to short out high frequency components in the signal. This helps in removing noise from the signal and providing a clean input to the following stage. Decoupling inductors are usually used in digital circuits, audio systems, and communication systems.

Working Principle

The working principle of fixed inductors is based on Faraday’s law. The changing voltage in the winding of the inductor inspires a change in current. This induces a magnetic field in the core, which tries to oppose the change in current. So, when current flows through the inductor, an impedance is created, which restricts the current flow as the voltage increases. This is the circuitry behavior of an inductor.

Fixed inductors come with a variety of cores and windings. The core materials can include air, powdered iron, ferrite, and other magnetic materials. The windings are usually copper foil for low frequency applications and litz wire for high frequency applications. The inductance value of an inductor is determined by the core materials, winding, and geometry. Inductors can be used in various applications from switching power supplies to decoupling applications.

In switching power supplies, the inductors are used to regulate and control the voltage level. By creating a low impedance path to switch currents during transitions, the inductors help to reduce the switch losses in the circuit. For decoupling applications, inductors are used to create a low impedance path to short out high frequency components in the signal. This helps to provide a clean input signal to the following stages and thus, reduce noise in the signal.

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