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Application of Inductance in Circuit
2021-09-27
The common function of the inductor in the circuit is to form the LC filter circuit together with the capacitor. Capacitors have the ability to "block DC and pass AC", while inductors have the function of "pass DC and block AC. If the direct current accompanied by many interference signals passes through the LC filter circuit, the AC interference signal will be consumed by the capacitor into heat energy. When the relatively pure direct current passes through the inductor, the AC interference signal is also changed into magnetic induction and heat energy, and the higher frequency is easily impedance by the inductor, which can suppress the interference signal of higher frequency.
LC filter circuit
The inductance of the power supply part of the circuit board is generally surrounded by a very thick wire coated with a circular magnetic core of various colors. And there are usually several tall filter aluminum electrolytic capacitors nearby, which are composed of the above-mentioned LC filter circuit. In addition, the circuit board also uses a large number of "snake line patch tantalum capacitors" to form LC circuits, because the snake line is folded back and forth on the circuit board, which can also be regarded as a small inductor.
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