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Six issues to pay attention to when selecting inductors

2024-06-26 10:29

What aspects should be considered when selecting inductors? When selecting an inductor, it is necessary to consider its performance parameters (inductance, rated current, quality factor, etc.) and whether the external dimensions meet the requirements. When selecting, the following six points should be noted:

① The number of inductors should be the same as the circuit requirements; Especially the coil inductance value of the tuning circuit needs to be precise. When the inductance is too large or too small, the number of coil turns can be reduced or increased to meet the requirements. For coils with adjustable compassion, the magnetic core should be adjusted to the middle position during measurement and debugging. When there is a significant difference in inductance, series and parallel methods can be used to solve it.

② The higher the Q value, the better. When the inductance of two inductance coils is the same, the smaller scale value can be selected according to the definition of Q value (XL/R), or the larger wire diameter with the same value can be selected for use.

③ The applied voltage and the current passing through cannot exceed its rated value.

④ For inductors with requirements for electrical strength, it is necessary to choose packaging materials with high voltage resistance. Generally, inductors with good voltage resistance have better moisture-proof performance. Resin impregnation, encapsulation, and die-casting processes can meet this requirement.

⑤ The main considerations for inductor leads or pins are tension, torque, solder resistance, and solderability. When the component has been manufactured for more than six months, a new solderability test should be conducted to ensure the reliability of the welding.

⑥ For SMT inductors, the selection should refer to the designed solder pad size. If using inductors with pins, without clear regulations and sufficient installation positions, vertical and horizontal inductors with the same parameters can be interchanged.

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