 QCW DRSSTC buck converter
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Dr. ISOTOP
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Sun Aug 28 2011, 04:29PM
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Registered Member #2919
Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
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Does the buck converter modulating a QCW DRSSTC have to be a synchronous buck? I see that both Steve Ward and Eric Goodchild use one.
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Goodchild
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Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
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Well it doesn't have to be synchronous. But if you use a regular buck you have to have some method to bring the voltage back down after a burst or when the OCD trips. If you don't do this the bridge will turn on with voltage on the bus and this can be catastrophic for your IGBTs.
A sync buck automatically brings voltage back down and recycles it back into the bulk C because of it's low side switch. A sync buck also can be more efficient then a regular one if built and tuned correctly.
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