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Registered Member #512
Joined: Sat Feb 10 2007, 05:42PM
Location: Chico, CA
Posts: 25
thanks Bennem
What would be the advantages of using feedback from the primary? Secondary feedback can be substituted for this.
And for over current detection in the primary, I'm thinking about using these high current shunts
It's basically a real rugged, linear resistor so the current can be measured as a proportion of the voltage across it. Let me know what you guys think.
Registered Member #154
Joined: Sun Feb 12 2006, 04:28PM
Location: Westmidlands, UK
Posts: 260
Hi Gentoo,
Allthough secondary feedback works, the current in the secondary coil is not completely represenative of the current in the primary coil. To acheive zero current switching, which is what we want, the best method feedback for a DRSSTC presently is primary feedback. IMO.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Firstly, let me say that my design is particularly that way for a reason (ive blown up enough silicon figuring it out, so everyone else shouldnt have to).
The picture you linked was of the secondary feedback, and is thusly out of date. Do not use secondary feedback! As Ben said, primary feedback ensures zero current switching (aside from switching delays) and is much more robust.
On the first 1:33 turn CT, you dont need to "wind" a primary, just slip the ferrite toroid with 33 turns on it, around the primary conductor, from the output of the bridge. Do not put the CT on the node connecting the L and the C as the voltage rings up to many kV at this node!
Current shunts: why would you want to use a shunt??? This would require your controller/driver board be connected to the H-bridge directly. This is why CTs exist!!! Not to mention that a CT will *undoubtedly* give a cleaner signal of the current through the primary.
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Chris, those epoxy-dipped CTs are really sexy! I remember when you posted the pics of them earlier. Tell me, is the field well constrained to within the ferrite core? If you put them side by side, do the cascaded CTs get confused?
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DRSSTC 2 SIMULATION PROBLEMS
