TPU - General Discussion

[epwpixieq-1]

@Grumpy

Very useful links/books, and a lot ... a lot  to learn,  thanks !

Best

[wattsup]

@Hi guys

Here's a question for the EEers from your resident nonEEer.

If I take an AC/DC transformer, let's say 110vac to 50vdc but instead of sending 110vac into the primary, I send 110vdc but I alternate the polarity so each back and forth alternation occurs at 60 times per second, would this work.

I guess what I am asking is does continuous switching the polarity of a DC current equal AC?

I  know this might sound real dumb, but for me it is important.

Imagine, I only recently understood that a DC to DC transformer (not converter) is impossible so this is opening a whole new world of potential for me.

I would spend hours winding coils on coils with pulses, etc. and all I would get is heat. I know now why the ECD coils never came to life. Geez.

Know you know why I think it might be good to have a thread called Learning EE basics. 

[Grumpy]

as long as the input is changing you will get an output at the secondary - well to a point anyway.

If you send a pulse in - you will get a pulse out

If you send a squarewave in - you will get a pulse out because the steady top of the pulse is not changing

[z_p_e]

If you send a squarewave in - you will get a pulse out because the steady top of the pulse is not changing

Oh my...

[kames]

@wattsup,

If you really don?t have enough experience with it, don?t use such high voltage. If you want to play with it, your safety is up to you.

I guess what I am asking is does continuous switching the polarity of a DC current equal AC?

In your case (only in your case) continuous switching the polarity of a DC is not the same as AC but would be close to it (I would say square root of two, ie, about 71% or 141%, depends from which side you are looking at it.). You might get a very high BEMF. Be careful. Switching your transformer in reverse and still using 110dc can burn it easily. Why don?t you try to use 5V for now and see what happens.

It is better to be on the safe side than to have the rest of the day with shaking hands, at best.

@Grumpy,

I guess you wanted to be more generic. In this case you are right. However, what you have said is not correct. Assuming all the conditions are ideal, no limit for power, frequency, core saturation, no coil impedance and so on and on and on? if I keep the input current (practically flat input voltage) rising in the linear mode I would get a perfect flat DC output.

Kames.