Reasons and solutions for inductor whistling 1

Inductor whistling refers to the high-frequency oscillation sound that occurs when using inductors in a circuit, which can affect the normal operation of the circuit and even damage circuit components. There are many reasons for inductor whistling, mainly including the structure and materials of the inductor itself, the design and layout of the circuit, and other factors. Below, we will analyze the causes and solutions of inductor howling from these aspects. diode

1、 The structure and material of the inductor itself

1. Coil structure

The coil structure of inductor BCP69 is an important factor affecting howling. For example, when the distance between the metal foil or metal shielding layer in the coil and the turns of the coil is uneven or asymmetric, induced current will be generated, causing whistling sound. In addition, excessive coil turns and thin wire diameters can also lead to the generation of whistling sounds.

Solution: Choose coils with fewer turns, larger wire diameters, and reduce irregular structures such as uneven inter turn distances between metal foil or metal shielding layers and coils.diode

2. Material selection

The material selection of inductors can also affect their operational stability and howling. For example, when the magnetic core material of an inductor is not selected properly, the magnetic core will produce hysteresis phenomenon, which can cause whistling sound. In addition, when there is an air gap between the coil of the inductor and the magnetic core, it can also lead to the generation of whistling sound. diode

Solution: Choose a suitable magnetic core material, such as ferrite material, to reduce hysteresis phenomenon. At the same time, try to avoid air gaps between the coil and the magnetic core, and choose a structure with good sealing performance. diode