high frequency transformer
are mainly used for power transmission and distribution system from the
power transmission, voltage conversion and insulation isolation role in
the application of the use of conditions include two aspects:
reliability and electromagnetic compatibility. Previously only pay
attention to reliability, and now due to increased awareness of
environmental protection, we must pay attention to electromagnetic
compatibility.
Reliability refers to the specific conditions of use, high-frequency
power transformer can work until the normal life so far. General use
conditions for high frequency power transformer is the greatest impact
on the ambient temperature. Some soft magnetic materials, Curie point is
relatively low, sensitive to temperature. For example, manganese zinc
soft ferrite, Curie point only 215 ¡æ, magnetic flux density,
permeability and loss are changing with temperature, in addition to the
normal temperature of 25 ¡æ, but also given 60 ¡æ, 80 ¡æ, 100 ¡æ When
the various reference data. Therefore, the temperature of manganese-zinc
soft ferrite core is limited to 100 ¡æ below, that is, the ambient
temperature of 40 ¡æ, the temperature rise is only allowed to less than
60 ¡æ, equivalent to A-class insulation temperature.
Electromagnetic compatibility by
high frequency transformer manufacturers
refers to the high-frequency power transformer does not produce
external electromagnetic interference, but also to withstand external
electromagnetic interference. Electromagnetic interference includes
audible audio noise and non-audible high frequency noise. One of the
main causes of electromagnetic interference in high frequency power
transformers is the magnetostriction of the core. Magnetostrictive large
soft magnetic material, resulting in large electromagnetic
interference. High-frequency power transformer electromagnetic
interference caused by the main reason there is the magnetic force
between the core and the winding between the repulsion. The frequency of
these changes in frequency and high frequency power transformer
operating frequency consistent.
Shielding is to prevent electromagnetic interference, increase the
high-frequency power transformer electromagnetic compatibility of a good
way. However, in order to prevent the transmission of electromagnetic
interference from high-frequency power transformers, the corresponding
measures should be taken in the design of the core structure and the
design of the winding structure. The addition of the external shield is
not necessarily the best solution because it can only prevent radiation
interference , Can not prevent conduction transmission interference.
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