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I am ok with a mod moving this to the form that you think most appropriate.
I have a question about the voltage divider on the half bridge, I know to use good film caps I was planning to use when put together 10 caps 5 on each side, 1000V 5uf will that be enough for the power levels I am talking about?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
You need to use two banks of electrolytics in series anyway, to handle your 600V bus. So just use those as the "voltage divider" too.
BTW, if you drill your heatsinks with a few different sets of holes, you can probably get most half-bridge bricks to fit. Mine will take either Semikron or Powerex F-series.
thanks for the design tips I will need to figure out what to do with the 12 2400uf 450V caps that arrived today my parents were really upset lol that was a great deal though $29! I will need to figure out the best lay out for alot of them with low inductance bus bars connecting to the IGBT directly.
The only reason I questioned the divider because in a smaller coil the caps blew up after a long operation. I wasnt able to figure out if it was the caps were just too small, but if you think I can build it with the main caps as the divider I will.
I plan to though build it so I can without permanent changes move from a H-brige to half bridge.
and one last question is that can I use a simple comparator and resistor as a soft start? so when it is powered on the cap bank wont bring down the house, all it is that the power would be switched by a relay on startup through a 100ohm power resistor untill it reaches full charge then will trigger the relay to switch to a direct connection. or for a nice PSU like this should I build something like a powerful IGBT dimmer, I think that would be unnecessary though because I have full control by the inturupter?
Thanks for the help and I will be posting some sketches on the designe or pics once I get started.
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Rocketry76 wrote ...
and one last question is that can I use a simple comparator and resistor as a soft start? so when it is powered on the cap bank wont bring down the house, all it is that the power would be switched by a relay on startup through a 100ohm power resistor untill it reaches full charge then will trigger the relay to switch to a direct connection. or for a nice PSU like this should I build something like a powerful IGBT dimmer, I think that would be unnecessary though because I have full control by the inturupter?
Thanks for the help and I will be posting some sketches on the designe or pics once I get started.
You can buy a timer that switches a second relay to short out the resistor. That`s how I did in the CCPS. Then you can have slowblow fusing in the surge phase, and shift to fast blow fuses in the "run" phase.
ok so here is what I have now I have the 12 2400uf 450V caps and doubler 106A 1.2KV, and the 400A 1200V CM400 IGBT I should be able to get on to construction as soon as my second CM400 and heat sink arrive.
I am also working on the control circuitry along with this. now to just decide how many caps to use. All of them, sounds good.
one thing is that I am getting a 300A very similar model IGBT and the CM400 these are faster (60Khz) than the slandered CM. the ratings are verry similar and I wont go to 300A do you think I can use 2 different modules?
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Large DRSSTC plan
