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Recognition and Measurement of Electronic Components

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In this lesson, we mainly learn about inductor and its parameter identification

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Inductor is an essential power supply element in the power supply line

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Inductors are electromagnetic induction components wound with insulated wires

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As shown in the figure, after the copper wire surrounds the electromagnetic circle, it forms an inductance

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So we need to know that the structure of an inductor is a wire

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Inductors can be divided into chip inductors and plug-in inductors according to the installation method

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Plug-in inductors are generally used in large electrical circuit boards,

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such as desktop mainboards, laptop mainboards,

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and air-conditioner power boards

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Chip inductors are generally used in mobile phone mainboards

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Because the mainboard of the mobile phone is relatively small and the power is relatively low,

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most of the installed inductors are chip inductors

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Inductor functions

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Inductors are mainly used to pass DC and block AC in the mobile phone mainboard,

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and play the role of energy storage and filtering in the circuit

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That is, we often say that the power supply that generates large current

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There will also be some fuse inductors in the main board of the mobile phone,

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and the fuse inductors mainly play the role of fuses in the circuit

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Large inductors are generally located near the power IC

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Like this mainboard, there are many gray inductors near the Xiaomi 11 power supply

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And there are dot marks, which belong to the large inductor that generates the power supply

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The fuse inductor is generally located near the connecting seat,

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and the surface is gray-black

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The size of the fuse inductor is relatively small,

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and it is not easy to identify in the real object

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We can identify it through the schematic diagram or bitmap,

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Inductors are identified by the letter "L" in the circuit diagram

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Some inductors are used as fuse and will be marked with the letter "FL"

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For example, in the picture,

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L3401 is generally the inductor that generates large power,

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and FL1051 is generally the fuse inductor

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In Android drawings, some fuse inductors will be marked with "LB",

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such as LB6103

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Inductor unit

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According to the size of the inductor, the thickness of the line,

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and the difference in the current generated,

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the inductor will be represented by a special unit

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The unit of inductor is represented by the letter H in "Henry"

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The conversion relationship is,

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1H=1000mH

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1mH=1000uH

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For example, in the picture has an inductor of 0.22uH

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Ok, that's all for this video