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Registered Member #139
Joined: Sat Feb 11 2006, 11:01AM
Location: Perth, Western Australia
Posts: 358
Is it possible to do away with the GDT and drive the semi's directly from the UCC's? From my understanding the GDT provides isolation between the bridge and the driver circuitry. Is there any way of achieving this using blocking caps, or is there another way?
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Assuming you mean a full-bridge, you'll need to use a GDT to isolate the drive when driving with low-side gate drivers such as the UCC3732x chips. A blocking capacitor won't work since the level you are attempting to isolate is AC and not DC (remember its swinging at the operating frequency of the bridge)
There are also high side driver ICs which you can use instead of GDTs and optocouplers could be used as well.
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
I think Desmo is asking about e.g. in the case of a single transistor, connecting the UCCs straight up.
Just for imagination's sake, consider a fullbridge of MOSFETs... 8 UCCs (4 inv. and 4x norm.) and four 12V batteries. Do you mean isolated power supplies for each pair of UCCs/FET, Desmo, thus no GDT? ^^
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
For a Half or Full brige there are lots of complicated options, using optoisolators and/or levelshifters to get the drive potential up to the full floating voltage. If you are driving a single transistor, there is no need for a GDT except for impedance matching purposes.
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Direct driving MOSFETs
