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Re: [Amps] winding an HV transformer (part 2)

To: amps@contesting.com
Subject: Re: [Amps] winding an HV transformer (part 2)
From: Paul Decker <kg7hf@comcast.net>
Date: Mon, 30 Mar 2009 21:43:47 +0000 (UTC)
List-post: <amps@contesting.com">mailto:amps@contesting.com>

BTW, I did try to simulate the result using the 3.4 v p-p signal generator.   
I've had some issues believing the result as it seems my signal generator 
actually produces    -1.7 to +1.7 v pulses.   This makes me think there may be 
a difference to something truly 0 to + 3.4 V pulses which the diodes may see. 





----- Original Message ----- 
From: "Paul Decker" <kg7hf@comcast.net> 
To: amps@contesting.com 
Sent: Monday, March 30, 2009 5:37:17 PM GMT -05:00 US/Canada Eastern 
Subject: winding an HV transformer 






I've been holding this question for a couple of days now, I'm sure it is very 
simple and perhaps I just need some reassurance on the answer. 



If you have been following some of this smps discussion, I've got 100Khz pulsed 
DC (0 - 340v) which is generated by directly rectifing and filtering the 240 V 
AC mains and providing that into an h-bridge.   The h-bridge dumps the 340 V 
100Khz square wave into the transformer. 



As the QST article recomends, I've wound the transformer with five turns on the 
primary and had calculated that I need 30 turns on the secondary.   Performing 
some small signal tests, inputting 3.4v pk-pk square wave from my signal 
generator yeilds about 20.4 volts pk-pk square wave.   I believe this 
relationship should be linear and inputting 340 V will yeild 2040 volts on the 
secondary.    



At this point the secondary dumps into a full wave bridge rectifier followed by 
a filter capacitor.   This is where I am unclear.    When I rectify this with 
the full wave bridge, will I get 2040 * 0.90 or will I get 2040 * 1.414 as the 
final DC output?    Part of me says I get the 1.414 value of 2885 VDC, however 
reading through the handbook, I seem to be reading I'll get 0.90 the output 
voltage. 



thanks, 

Paul 







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