![]() Because the power transfer is rather small, DCR is of minor importance. The windings are at least bifilar wound with twisted wires is better still. Signal transformers therefore usually deploy ring cores with high permeability. The leakage inductances should therefore be kept as low as possible. Taking a look at the transformer equivalent circuit (chapter I/2.3, page 81 ff), it is apparent that the leakage inductances contribute to addition frequency-dependent signal attenuation. For the transformer, this means that its transformation properties should be as constant as possible up to high frequencies. they include a large number of harmonics. The signal profiles are usually rectangular pulses, i.e. For this reason, the transformer should have the highest possible main inductance. From chapter I/1.9 we know that the magnetizing current is not transferred to the secondary side. The signal should be largely unaffected in this case. Transformers are used on data lines mainly for isolation and impedance matching. ![]() In addition, sometimes different impedances have to be matched or voltages increased.Ä£.2 Requirements for data and signal transformers ![]() Data transformers: Here the main function is also isolation. ![]() drive transformers for transistors: The main function is isolation sometimes higher voltages are also required to drive a transistor
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