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Registered Member #2161
Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 247
Hello,
I am in the process of building my second SSTC. It follows Steve Wards class-e SSTC . My question is, would it be possible to use this driver schematic to drive a half bridge of IRFP460s , like in the mini SSTC schematic?
I would run the UCC output directly into the 460's, is this at all feasible? Should I just finish this one up as a Class-E SSTC and wait for my parts to arrive from farnell and build the mini sstc by itself?
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Half-bridge arrangement won't work for your standard class-E topology.
Also, you can't drive the UCC output directly to the 460's in a half-bridge configuration because its not isolated. You need a gate transformer for isolation.
Registered Member #2161
Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 247
Thanks for the advice Dr. Gigavolt. Will finish up the class-e first.
As I come close to finishing up this project another question has come up, regarding the start-up procedure. What do I turn-on first the driver or the power portion of the SSTC? I know turning on the driver without feedback and a FET attached will result in burning UCC chips, so power portion first then driver? Really stumped on this one.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
brtaman wrote ...
Thanks for the advice Dr. Gigavolt. Will finish up the class-e first.
As I come close to finishing up this project another question has come up, regarding the start-up procedure. What do I turn-on first the driver or the power portion of the SSTC? I know turning on the driver without feedback and a FET attached will result in burning UCC chips, so power portion first then driver? Really stumped on this one.
Thanks brtaman
Always drivers first!
Your driver design can risc having a state when powered off where it would have the FET turned on, so powering the bridge would result in a short.
As long as you have the UCCs driving a GDT with attached FETs there should be no problem in running drivers without power on the bridge, I have yet to have a failure.
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Single driver (UCC) for a half-bridge?
