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Characteristics and main applications of ferrite materials for high frequency transformers

There are two types of ferrite cores used in the production of high frequency transformers: ferrite cores and alloy cores. The ferrite cores are divided into three types: manganese zinc, nickel zinc and magnesium zinc. Alloy cores are also divided into silicon steel, iron powder cores, iron-silicon aluminum, iron-nickel full multi, molybdenum PoMo alloy, amorphous, microcrystalline alloy. Today by the power transformer manufacturers sincere Xinwang technology to everyone a brief explanation of the cores of the ferrite oxygen Hugh series.

The ferrite materials used in high frequency transformers are all soft magnetic ferrite materials. Due to the high resistivity of soft magnetic ferrite material, high frequency loss is small, easy to mass production, good consistency of the product, low cost, is currently the most used in high frequency transformers a magnetic material. Soft magnetic ferrite materials are mainly divided into Mn-Zn ferrite and Ni-Zn ferrite two categories, Mn-Zn ferrite for working frequency in 0.5 ~ 1MHz in the following high-frequency transformers, Ni-Zn ferrite for working frequency in 1MHz or more in the high-frequency transformers, Mn-Zn and Ni-Zn ferrite materials have many varieties, material characteristics are also different, respectively for various different requirements in high frequency transformers and inductors. The main areas include the following.

Power transformers for power transmission, voltage conversion and isolation etc. Materials with high saturation magnetic induction and low power losses are required.

Signal transmission transformers, used to transmit AC or pulse signals without distortion, impedance matching, isolation, etc.. Requires materials with high permeability, low hysteresis loss and low sensitivity to DC.

Filter inductors for telecommunications, requiring good stability and high Q-value. The material has low loss, a very low temperature coefficient in the specified temperature range and good stability against time.

Interference suppressors, which suppress unwanted high frequency interference signals and pass through useful high frequency signals. High impedance (high magnetic permeability) in the frequency range covered is required.

Inductors for delayed pulse circuits, used for the delay of pulses. Requires materials with high magnetic permeability.

Inductors for energy storage and smoothing circuits. Requires materials with high saturation magnetic induction strength values.

Tuned circuit inductors with a certain passband. Requires materials with appropriate losses and good temperature stability.

2.2 Types of ferrite cores for high frequency transformers

Ferrite cores are made by moulding and sintering, and there are many types, mainly E-shaped, can-shaped, U-shaped and ring-shaped, etc.

These are the basic characteristics and application range of ferrite materials

Post time: Sep-07-2022