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Registered Member #4074
Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335
Fantastic system you've got there RateReducer, surprisingly large arcs for the power input! Are you worried about the diodes in the doubler getting destroyed from high pulse currents? (I mean the large discharges from the caps when you strike an arc.)
Mr.Plasma-CRAZY wrote ...
Could you post a schematic for me? I would like to build one
Maybe you could start with something using more readily available components (the transformer core(s) and doubler in particular), since you might find it difficult to gather everything needed to replicate this circuit exactly (and especially have it run reliably at 5kW)?
I've been looking at building this simple bridge circuit for testing a couple of used IGBT bricks I've found: 555 IGBT half bridge
Also, I found this site to be helpful for getting a grasp on the basics of bridge design: H-Bridge Basics
Registered Member #4603
Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
Thanks! The diodes do their job quite well but they get f.... hot! They even meltet a hole into the plastic enclosure that stores the diodes and the oil, meesing up my carpet -__- I need to get a bigger enclosure with more oil in it than just one cm so that the diodes do not become so hot...
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
Im guessing the brick you have there in use is a CM300? Im thinking of buying one off EVR as their used ones are only $99 I do wonder how well tested the used ones are, if they are tested with current and voltage ect. as whenever i think of buying used semiconductors i get scared il buy a load of zombie ones
Im currently working on my room/ workshop, once ive got the benches all set up and the 64-80A cable run upto my room i plan to build some things like this, mabye scaled up abit ;D
Registered Member #4603
Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
No it is not a CM300 2MBI300S-120 300A 1200V 40nF on the Gate ^^ It is a used one from Ebay. Only 20€! I think if you buy your used bricks at a trustable seller it will surely be in a good condition.
Registered Member #4603
Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
__=|(:3)-|--{__: Lower gate capacitance means that there is less current needed to drive your IGBT which is good But if you have a nice gate drive, high gate charges are no problem at all.
HDF49: Thanks! It a special HV insulating oil from an X-Ray transformer.
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3kW IGBT Halfbridge Inverter *UPDATE 5kW*
