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Registered Member #1169
Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251
As suggested by Daniel, I'm going to use Steve's 8kW PFC Boost Converter to power the new DRSSTC I am constructing.
Perhaps it would be better to ask Steve directly but, does anyone know if any further improvements have been made to Steve's Active Snubber design? Although a 200W power loss seems pretty good to me considering what it was before, I wonder if any improvements have been made to this particular design since 2006.
Thought I would ask before i just start building this thing.
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Hi all last two weeks i was making high power SMPS. now have almost all part's for it, so soon we have to see working SMPS. It's voltage mode step up (1:3 or 1:3.5) SMPS, powered by 50A fet's. Not loaded output have to give up to 900V, but i will add some ~100W load, so PWM will stabilize it right to 800V I guess this type step up "transformer" is more easer to make, then Steve Ward inverter If every thing will go ok, i will publish all data, for this SMPS making (lay files, and other) so far:
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
> I guess this type step up "transformer" is more easer to make, then Steve Ward inverter.
It may well be easier to make, but one of the design goals of Steve's "8kW Active PFC boost converter" was to give Power Factor Correction. The input current to his boost converter will be nearly sinusoidal and therefore have the lowest possible RMS current figure. Whereas the input current for any SMPS which uses a passive rectifier-fed DC bus is a horrendous spikey waveform, with poor power factor and massively inflated RMS current figure. This fact becomes very important once you start to draw kW's of power from the mains supply. If you don't understand what I'm talking about then read up on "harmonic power factor correction".
The lousy power factor of a traditional rectifier-fed SMPSU can only be properly corrected by proceeding it with an active power factor corrector stage. This is often called something like a Boost PFC pre-converter. In the case of Steve W's design, he realised that this one boost converter could boost the input voltage to hundreds of volts at the output and provide the essential PFC function at the same time. It is also semi-regulated in that there is some negative feedback in order to roughly control the output voltage. The only things it doesn't provide are electrical isolation from the mains line and output short circuit protection. The output voltage also always must be higher than the peak input voltage, so you can't "wind it down to zero" like you can with a variac or a forward derived switching converter.
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Yes, i was thinking about PFC, but when power is around 0,5-2KW, it's very good, and quite easy to make. But now is large current, i know, that i just take top of sinusoidal signal from line, and left in line very bad signal. (220V). Maybe i will add it later, i don't know. (because need same heat-sink, and some powerful low los IGBT) if some one can give 8KW PFC circuit, i will try to add it... cheers, Linas
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Steve Ward's 8kW PFC Boost Converter
