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This article outlines key requirements for common-mode inductor production, including wire insulation, avoiding core saturation, and core-coil insulation. It also highlights the advantages of single-layer winding and stresses the importance of impedance-based selection for optimal performance.
(1) Insulation of Wires: In the production of common-mode inductors, it is imperative that the wires wound around the magnetic core of the coil are thoroughly insulated. This insulation serves the vital purpose of preventing any instances of breakdown and short circuits between the individual turns of the coil, especially when subjected to sudden overvoltage conditions.
(2) Avoiding Core Saturation: During the flow of instantaneous large currents through the coil, it is crucial to ensure that the magnetic core does not reach a state of saturation. Saturated cores can significantly impact the performance of the inductor, so measures should be taken to prevent this occurrence.
(3) Insulation of Magnetic Core: A further precautionary step in common-mode inductor production involves isolating the magnetic core from the coil itself. This insulation helps to guard against breakdown between the core and coil, particularly when exposed to abrupt overvoltage events.
(4) Single-Layer Winding: Whenever possible, the coil should be wound in a single layer. This winding method offers several advantages, including a reduction in parasitic capacitance and an enhancement of the coil's resistance to instantaneous overvoltage.
In general, it is crucial to pay careful attention to the required frequency band for filtering. The larger the common-mode impedance, the better the inductor's performance. Therefore, when selecting a common-mode inductor, it is advisable to consult device data and primarily base the choice on the impedance frequency curve. Additionally, when making a selection, it is essential to consider the influence of differential mode impedance on the signal, with a particular focus on high-speed ports.
