source:Industry News Popular:adapter release time:2021-05-27 09:48:18 Article author:sznbone
The efficiency and performance of a saturated single-transformer converter mainly depends on the choice of transformer material. When working at high frequencies, low-loss rectangular hysteresis loop ferrite materials are usually selected. Rectangular hysteresis loops and band-wound toroid materials are also used, because very thin laminated core materials must be used in order to reduce losses, and these materials are more expensive at high frequencies. The recently developed amorphous alloy rectangular hysteresis loop material shows good properties in this application.
For some rectangular hysteresis loop materials, the permeability (the slope of the B/H characteristic in the saturation region) after saturation is very low (B is high). The figure shows the characteristics of the H5B2 material. Therefore, the magnetic flux density change between S1 and S2 is very small, and the flyback effect during turn-off is weak, which makes the switch action slow during the conversion period. In the figure shown, it can be seen that H7A or similar core materials have a more powerful switching effect, but because these materials have low Br (remanence) values, core losses are often higher.
For toroidal cores, it seems that the designer must use rectangular hysteresis loops, low-loss cores (low core loss but slow switching), or low-permeability and higher-loss cores (switching faster, but the magnetizing current is higher due to the smaller inductance. High, and there is a greater loss) to make a compromise choice. For other core structures, air limitation can be introduced to solve the problem. This can give a powerful switch without increasing the core loss. Suitable rectangular hysteresis loop and metal ribbon winding materials include rectangular permalloy, nickel-iron high-permeability alloy and various HCR materials. Some almost rectangular amorphous alloy materials can also be used. Be careful when choosing the rectangular hysteresis loop material. When the hysteresis loop is too close to the rectangle, it will not cause oscillation because the flyback effect is too weak.
It is recommended to use rectangular tape loop ferrite material for high frequency applications. Suitable models include Fair-Rite#8 Siemens T26, N27, Philips 308 TDK H7C, H5BH7A and more.
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