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Diagram below indicates the power supply and the switchi ng frequency (ripple frequency) that are suitable for Super Core. As the data shows, Super Core is suitable for medium-capacity inverter and converter reactors of 3 kHz, 1 kVA or 10A or higher. Particularly with this power supply, Super Core effectively brings such benefits as high efficiency, compact size, and low noise. |
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| Suitable core materials for transformers and reactors in switched mode power supplies |
lTypical magnetic properties of soft magnetic core materials applied for
switched mode power supplies using IGBT, MOS-FET
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| Diagram below shows the characteristics of general magnetic cores and Super Core (JNHF-Core and JNEX-Core) from the perspective of the magnetic characteristics required for a high-frequency reactor, i.e., core loss and saturation flux density. In this diagram, the iron loss is compared under a ripple frequency of 20 kHz. The data shows that JNHF-Core and JNEX-Core both have the necessary characteristics for a high-frequency reactor, and indicate superior total balance compared to the other magnetic cores. |
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Due to the high saturation magnetic flux density, the low core loss at high-frequency and the high-permeability of JFE Super Core, it is ideal for applications in high-frequency reactors with high-frequency current superimposition over a broad range of frequencies.
Because JFE Super Core meets all high frequency wave regulations and power factor improvements, demand is on the increase for its use in not only inverter output reactors but also in active filters and in PWM converter reactors in the market sectors from consumer electronics to industrial, renewable power generation and automotives.
JFE Super Core meets a diverse range of customers needs since it can be formed into wound cores, such as C-cores and toroidal cores, as well as into lamination cores and glued block cores of various shapes by cutting or pressing.
For example, as illustrated in the figure on the bottom right, a reactor with 4-point gaps, consisting of a combination of glued-lamination core and a flat, vertically wound coil, with excellent impedance-frequency characteristics, shows DC superimposition characteristics that are far superior to conventional wound core with one or two gaps.
Furthermore, the low magnetostriction characteristics of JNEX-Core reduce high frequency noise in the audible ranges of 20kHz or less, and therefore provide quiet power sources for inverters and converters. |
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| Comparison of DC superimposition characteristics |
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| High-frequency transformer |
The low core loss characteristics at high-frequency of JFE Super Coreallow it to be effectively used for a wide range of transformers, driven from several hundred Hz to several tens of kHz.
JFE Super Core allow the transformer to generate less heat, and provide higher design induction than conventional silicon steel sheets, enabling transformer size to be reduced. This then reduces the quantities of other required transformer materials, such as the copper wire, leading to overall cost reductions.
By taking full advantage of the low magnetostriction characteristics of JNEX- Core, it is also possible to reduce transformer noise dramatically.
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| Examples of noise and size reduction for high-frequency transformers(for fixed core loss)
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| High-frequency transformer noise and core loss comparison |
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Because of its superior low core loss characteristics, JFE Super Core has many advantages in high-speed motors and power generator applications -- stator, rotor, and yoke -- and contributes greatly to efficiency.
It is also effective in reducing noise that is caused in part by magnetostriction.
JFE Super Core has attracted the attention for its use in electric and hybrid car motors, power generators, as well as the motors for OA devices. |
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Applications are diverse, including magnetic shields, which take advantage of the excellent permeability into high-frequency ranges, magnetic yokes used at high-frequencies, heating equipment inductors, and CT(Current Transformer). Other applications include inductors and filters that reduce high-frequency noise. |
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