If you use a low Ur high freq ferrite the effect will be less pronounced, but still there - some may suggest a low Ur iron powder core - but you will still have the issue of falling L and higher losses than for ferrite. With no gap the L will be high (Ur ~ 2300) until you put some current thru it ( ~ 5 amp say ) then the L will fall over as the ferrite saturates. Your basic problem here is that you appear not to have given yourself enough room to design a choke - or part of a transformer - with sufficient size to allow a small air gap to fix the inductance. This is our ing clip-on ferrites as in the top post….īut anyway, in our ferrite inductive couplers, we don’t need energy storage…because they are used as transformers…however, the resonant power stage in the driver will see the inductances of the primaries, and therefore we need to know what they are, because they will effect the resonant frequency of the driver stage which produces the fixed 50khz rms sinewave current. If most of this 1.9A current is magnetising current, then we aren’t going to have any “primary referred secondary current”……and then we won’t be able to get anywhere near enough secondary current for our LED luminaires… They are usually included as standard on various types of computer cables, though people designing digital data equipment and may end up adding additional ferrite sleeves, beads or other components to cables to reduce interference to a specified level.Click to expand.Thanks, then we’ve had it, because we only have a single turn primary and we simply can’t have any air gap no matter how small, because we need to get our primary magnetising inductance up high because we only have one turn on the primary……the primary current in one of our systems for example is fixed at 1.9A RMS……….(it’s a 50khz sine). They can also be incorporated into ferrite core chokes, broadband transformers, inductors and other components. These cores are designed for noise suppression and are frequently used in antenna and RFID applications.
As well as these materials having the capability of functioning as the core in a transformer, they also have tremendous capabilities in terms of reducing electrical interference moving to or from devices, and are heavily used in radio equipment. What do they do?įerrite cores help to protect against radio frequency interference (RFI) and electromagnetic interference (EMI). They are among the most versatile and important pieces of basic electronic equipment and many modern devices would not be able to work without them. A Ferrite core is a type of magnetic cylindrical core that is made from ferrite, a ferrous material.
0 kommentar(er)
