Regarding chip inductors with and without packaging
Release time:
2022-01-07
The chip inductor package is divided into shielded and unshielded. Flat and I-shaped ones are generally unshielded, and square fully enclosed ones are shielded.
The chip inductor package is divided into shielded and unshielded. Flat and I-shaped ones are generally unshielded, and square fully enclosed ones are shielded.
The shielded chip inductor has a different inductance effect from the general chip inductor. The general chip inductor is not shielded in the circuit, and the inductor does not achieve the desired effect in the circuit. The shielded chip inductor can shield the instability of the current in some circuits and play a good role in blocking. The complete metal shield of the shielded inductor surrounds the positively charged conductor. The inner side of the shield will induce the same amount of negative charge as the charged conductor, and the outer side will have the same amount of positive charge as the charged conductor. If the metal shield is grounded, the positive charge on the outside will flow into the earth, and there will be no electric field on the outside, that is, the electric field of the positively charged conductor is shielded in the metal shield.
Shielded inductors also play a coupling role in the circuit. To reduce the coupling interference voltage of the alternating electric field on the sensitive circuit, the shielded patch inductor can set a metal shield with good conductivity between the interference source and the sensitive circuit, and ground the metal shield. The magnitude of the coupling interference voltage of the alternating electric field on the sensitive circuit depends on the product of the alternating electric field voltage, the coupling capacitance and the grounding resistance of the metal shield. As long as the metal shield is well grounded, the coupling interference voltage of the alternating electric field on the sensitive circuit can be made very small. Electric field shielding is mainly based on reflection, so the thickness of the shield does not need to be too large, and the structural strength is the main consideration.
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