Before understanding how to purchase suitable inductors, let's first understand what inductors are and the basic principles and parameters of inductors.
Introduction to inductors:
Inductors - also known as chokes, reactors, and dynamic reactors. Together with capacitors and resistors, they are known as the three major passive components, and relay containers and resistors have rapidly developed into chip based components.
The basic principle of an inductor:
Self induction phenomenon: electromagnetic induction phenomenon produced when the current flowing through the conductor itself changes. The coil is made of metal wires. When the current flowing through the coil changes, it will produce a very obvious electromagnetic induction phenomenon. The coil's self induced reverse electromotive force blocks the change of current and plays a role in stabilizing the current. Specifically, if the inductor is in a state where there is no current flowing, it will attempt to block the flow of current when the circuit is connected; If the inductor is in a state with current flowing through it, it will attempt to maintain the current constant when the circuit is disconnected.
From an energy perspective, an inductor can convert electrical energy into magnetic energy and release magnetic energy into electrical energy. The same inductor has different blocking effects on currents with different changing frequencies, and its overall pattern is: low frequency on, high frequency on.
Main performance parameters of inductor:
Inductance, also known as self inductance coefficient, is a physical quantity that represents the ability of an inductor to generate self inductance when the current flowing through it changes. The magnitude of inductance reflects the strength of the energy stored and released by the component. Inductance is an inherent characteristic of an inductor, which depends on the number of coil turns, winding method, magnetic core material, etc.
How to choose the appropriate inductance?
The appropriate inductor is mainly determined based on the packaging size of the inductor, as well as the minimum inductance and rated working current required for circuit design. In addition, it is necessary to comprehensively consider the working environment of the inductor, referring to parameters such as working frequency and voltage.
What are the effects of choosing an inappropriate inductor?
If an inappropriate inductor is selected, the basic energy storage and filtering function of the inductor cannot be achieved, or it may cause circuit short circuits, leakage, and even more severe inductance heating, which may cause circuit board self ignition, affecting the use of the circuit.
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