Identification and detection methods of common inductance types

Release time: 2021-05-18

1, inductors are commonly referred to as inductors, is one of the basic electronic components commonly used.

There are many kinds of inductors, different shapes, the more common are: single-layer flat wound hollow inductors, interwound hollow inductors, empty core coil, multi-layer hollow inductors, honeycomb inductors, inductors with magnetic core, magnetic tank inductors, high frequency choke, low frequency choke, fixed inductors and so on.

2, the fixed inductor is a series of products with strong versatility, the coil (often containing a magnetic core) is sealed in the shell, with small size, light weight, solid structure, stable inductance and easy to use and install.

3, the other is the color code method, that is, the color ring represents the inductance, and its unit is μH.

The 1.2 ring represents two significant digits, the third ring represents the multiplier, and the fourth ring of the chip shield power inductor manufacturer represents the allowable deviation. The rated current refers to the max current allowed by the inductor when it is working normally. In use, the actual working current of the inductor should be less than the rated current, otherwise the inductor coil will be seriously heated or even burned.

4. The resistance of the inductor to alternating current is called inductive reactance, expressed by the symbol "XL" and the unit is Ω.

Inductive reactance is equal to the ratio of the AC voltage (RMS) at both ends of the inductor to the AC current (RMS) passing through the inductor. The inductive reactance XL is directly proportional to the frequency f of the alternating current and the inductor's inductance L, respectively, i.e. XL=2 L fL (Ω).

5, inductors can be used to distinguish high and low frequency signals.

Because the high frequency choke coil L is highly reactive to the high frequency current and very small to the audio current, the high frequency signal output by the VT collector stage of the common-mode inductor factory transistor can only enter the detection circuit through C. The audio signal after detection can reach the headset through L after being amplified by VT.

Good or bad judgment: The reading of the chip inductance at this time should be zero, and if the multimeter reading is too large or infinite, the inductance is damaged.

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