Key Advantages for High-Frequency Inductors
Extremely Low Eddy Current Loss: Ferrites possess high resistivity (ranging from 10² to 10⁶ Ω·cm)-far exceeding that of metallic magnetic materials-resulting in minimal eddy current loss under high-frequency alternating magnetic fields; this is the primary reason for their suitability in high-frequency applications.
Broad Frequency Coverage: Ferrites of various compositions can meet requirements across the entire high-frequency spectrum, with products available for ranges spanning from tens of kilohertz (kHz) to the gigahertz (GHz) level.
High Saturation Inductance: Ferrite inductors offer high saturation inductance values, meeting energy storage needs for high-power, high-frequency applications while allowing for great flexibility in size and capacity design.
Excellent Magnetic Properties: They exhibit favorable permeability and dielectric constants-with permeability reaching up to several thousand-effectively enhancing the electromagnetic conversion efficiency of high-frequency inductors.
High-Frequency Suitability of Different Ferrites
Manganese-Zinc (MnZn) Ferrite: Standard versions are suitable for the 100 kHz–200 kHz range, while high-frequency variants with optimized formulations can operate between 1 MHz and 6 MHz; they are commonly used for high-frequency inductors in low-to-medium power switching power supplies and PFC circuits.
Nickel-Zinc (NiZn) Ferrite: Suitable for the 1 MHz–100 MHz range and even up to the GHz range; characterized by higher resistivity and lower losses at high frequencies, it is the preferred core material for RF circuits, high-frequency filters, and EMC ferrite beads.
