Re: switched mode power supply

To: tesla-at-poodle.pupman-dot-com
Subject: Re: switched mode power supply
From: Tesla List <tesla-at-stic-dot-net>
Date: Thu, 27 Mar 1997 08:54:55 -0600
Approved: tesla-at-stic-dot-net

Subject: 
        Re: switched mode power supply
  Date: 
        Thu, 27 Mar 1997 12:32:27 +0200
  From: 
        Kenneth Aaron <kennetha-at-geocities-dot-com>
    To: 
        Tesla List <tesla-at-pupman-dot-com>

>
>Subject: 
>        Re: switched mode power supply
>  Date: 
>        Wed, 26 Mar 1997 14:08:24 +0200 (EET)
>  From: 
>        Harri Suomalainen <haba-at-cc.hut.fi>
>    To: 
>        Tesla List <tesla-at-pupman-dot-com>
>
>
>On Sun, 23 Mar 1997, Tesla List wrote:
>> >PWM chip ----- FET ---OOOprimaryOOO---- +ive
>> >I found that while say 1A was being fed into the circuit, 4A say
>> >(average) was
>> >being switched by the FET and 3A was fed back onto the +ve rail via the
>> >protection diodes. (with out these diodes overvoltage killed the FET)
>
>You should use eg. clamp winding. Brute force clamping by a diode
>backwords in parallel with the primary is not a good idea!
>
>> >I now use Duane Bylands magnifier arrangement:
>> >ground----OOOSMPS secondaryOOOOO------OOmagnifier coilOOO-----toriodal
>
>I've found that setup very satisfactory too.
>
>> it's still an idea. if it works it should be sreat, no tonnes of iron
>> and
>> copper like traditional xfrms.
>
>There are lots of nice things that do work. However, do not expect
>wonders with a cw driven coil. My latest prototype was nothing
>compared to conventional ones. It definately needed around 500-1000W
>to be any fun.. ;)
>--
>"99% of the pain in the world is due to misunderstanding" -M.
>Jarvelainen
>
>Harri.Suomalainen-at-hut.fi - PGP key available by fingering
>haba-at-alpha.hut.fi
>
>


i have re-considered the SMPS and it's too much work. 
I'll do it with a transformer at the moment.
----------------------------
Kenneth Aaron 
E-mail : kennetha-at-geocities-dot-com
http://www.geocities-dot-com/SunsetStrip/8736/
----------------------------