 An attempt at a QCW DRSSTC design
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cjk2
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Registered Member #51
Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
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I have done lots more work on this design.
The buck converter works pretty well as far as I have tested it. The board will be redesigned soon as the current one gets warmer than I would like.
I am having problems with the self resonant full bridge driver. I believe I have shoot through problems. my output stage is a full bridge of two FDD8424 driven by an IXDI604. The circuit looks similar to Steve Ward's UD 2.1 seen here: http://www.stevehv.4hv.org/leadcomp/UD2_1revB/UD2_1revbschem.pdf.
I was running the driver CW from a function generator to test. At 320 Khz, I see a current draw of 70 ma with no load on my GDT. With the gate of one IGBT connected, the current draw goes up to 450 ma. I expect to see about 250 ma in this case so I suspect something is wrong with my output stage.
Any ideas?
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zzz_julian_zzz
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Registered Member #3964
Joined: Thu Jun 23 2011, 03:23AM
Location: Valenzuela City
Posts: 332
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Hi Cjk2,
Just wondering on your schematic, you put the positive 5V on the 4th pin of MCP6562 which is based on the datasheet, it is the Negative rail of the this IC. Same with the 8th pin - connected on the ground. ( Which in the DS it is the positive rail).. Isn't its just a misconnection/wrong pin config? thanks.
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