Transformer for DC-DC converter

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Transformer for DC-DC converter

Postby arivalagan13 » Thu Mar 14, 2013 11:08 am

Hello all,
In the process of designing a DC-DC converter am stuck with a major blow with transformer..

My project is 9V DC to 500V DC converter...The 9V source will be coming from a normal 9V battery available in markets..and output current shall be scaled down appropriately..(for control i'll be using PSoC1)

I need to construct a transformer for this application..

i would like to switch the transformer with approximately around 20 or 30KHz..(am not clear with how to choose the frequency systematically :( )

I've done this sofar:
Taken a E(or M) shaped ferrite core and bobbin of appropriate size..in the primary 90 turns of AWG no. 46 and in the secondary 5000 turns of AWG no. 26)
..I was expecting for a 9:500V(i/p:o/p) but as i gave 1V sinewave through function generator i got only 22V sinewave @ secondary but will lot of noise surmounted on the sinewave...simply not my day..

Then i purchased a ready-made switching transformer used for SMPS to trigger out how it was constructed and to test it..(unfortunately none of the specs. are known to the local vendor)...nothing worked my way..then i cut-open this and found similar type of construction which i did it myself...

Can somebody kindly support me constructing the transformer for the above specs :mrgreen:

Note: I humbly welcome support with some design example..sorry i should not expect this but (please accept my apologies) am in critical phase of my project work and need to finish it ASAP..

Kindly support...

Regards
Arivalagan M
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Re: Transformer for DC-DC converter

Postby bobmarlowe » Thu Mar 14, 2013 11:40 am

Let me think: Did you measure the applied voltage at the primary coil or did you trust your function generator to deliver the needed current without decrease of output voltage?
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Re: Transformer for DC-DC converter

Postby arivalagan13 » Thu Mar 14, 2013 12:17 pm

Thanks for reminding it,Bob...i understand it would load...

what i did to the primary was the following:
Top end of primary will be connected to V+ of battery..to the other end of primary will be one transistor buffer...
Transistor collector to primary's bottom end,emitter grounded..base is getting input from Schmitt trigger through a 2.2K resistor..using SL100 transistor for this..

Regards
Arivalagan M
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