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From: firstname.lastname@example.org (Richard Nienhuis)
Subject: High power current sources...
Date: 7 Dec 2002 00:01:36 -0800
NNTP-Posting-Date: 7 Dec 2002 08:01:36 GMT
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?
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