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Thanks prs09210 for posting your experiment. I came across this subject by googled it. I think your experiment result fits with the simulation picture that some one else had posted before. Here is what I think: depends on how long is the pulse on primary coil is and how much the Henry of the primary coil of the transformer is that we will have square wave or a short bust of voltage on the secondary coil. I.e. for a certain value of transformer, if the primary voltage stays high for long enough that when primary current reach near DC value then voltage on secondary start to fall, as a result, the voltage on secondary just looks like a burst of voltage compare to long width of the primary voltage, so the secondary is not a replica of the primary voltage. But imagine that if we turn off the primary voltage very soon (a very short time of high, during that time the primary current is linear) then the secondary voltage will stay at constant DC during this time, then falling at the same time as primary voltage; hence we have a replica of the primary on the secondary. The same thing can be achieved by using another transformer with much more turns on the primary coil instead of narrowing down the width of the square wave. The simulation picture posted by previous person showed this trend. So for transformers, the low frequency component is of more important I.e. any low frequency transformers can be used for RF transformer (if cost is not a factor), but the reverse is not true.
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Just a thought, to tidy up messy pulses, perhaps putting them into another transformer, might tidy them up a little bit more towards a sinewave?Probably some sort of capacitance to help with the fall of wave so it is slower to fall rather than blocky, then putting that into the second transformer. As the rise and fall has a lot to do with the induction. And generally speaking, like in the old points system in a car, the bigger effect is when the magnetic field collapses creating the best spark, as there is no for want of a better word, "resistance" (not electrical), when the field collapses. But there is a push against the building up magnetic field on the rise voltage, which is an inductive reactance effect creating that resistance.But if you want to get any current out of it, it goes without saying that the square wave will have to power a power transistor circuit.
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Posted:Mar 27, 2010
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