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From: "Harry Dellamano"
Subject: Re: High power current sources...
Date: Sat, 7 Dec 2002 10:03:51 -0800
Organization: Posted via Supernews, http://www.supernews.com
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"Richard Nienhuis" wrote in message
> I am trying to build up a 10KW current mode switching supply. I am
> trying to design this somewhat opened ended since the input voltages
> will be changing in the future. 120-480v, 1 or 3 phase. But for
> starters on the design I am targeting 240v input, 20A or so output.
> Voltage is not too critical right now.
> The goal of this supply is to drive a water cooled induction heating
> head. It needs to drive the head at resonance and track changes in
> resonance. I have most of the mechanics isolating the head and
> maintaining water tempature done. But I have some questions on what
> the best approach for the PS is. Also keep in mind, this first
> version will only run at 1KW but I want it to be able to scale up to
> around 20KW without to many changes to the basic design.
> I'm also trying to make this design fairly efficent. So I'm going to
> attempt to do PFC, Synchronous rectification, Zero voltage/current
> switching. I would also like to avoid doing water cooling of the
> power supply, though it would not be too difficult to add another loop
> to the water cooling system.
> What topology I end up using is probably going to depend on how I
> scale this up. I was thinking of having several parallel supplies
> driving a multi tap primary transformer and have the load on a single
> secondary. This might bring up a few synchronization problems though.
> Does anyone have some experience at designing mid power supplies like
> this? What topo do you tend to favor for applications like this?
> The supply is also going to probably use a TI C2000 with some MOS/IGBT
> drivers. Hopefully I can get sufficent responce out of it at is
> relativly low clocking speed. It should be enough to drive everything
> Also whats the best way to track circuit resonance?
> Rich Nienhuis
Sounds pretty strait forward. We have experts on this NG that will give you
a lot of positive encouragement. Watch particularly for John Fields and Bob
Sorry Bob, I just could not resist.
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