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Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
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Posts: 874
Thanks Fred Apart from way larger capacitance to make the discharge have a flatish curve, do you think theres anonther way?
Reading another thread and Ash Small gave me a brain wave, below pic should have quicker discharge by being in series, with a external field being created, with a one turn salt water as the secondary.
Registered Member #54441
Joined: Mon Feb 09 2015, 11:33AM
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Posts: 9
you should be able to parallel up your lgbt just like any other component to increase your current. i use this for mosfets/regulators when i need more juice or worry about heat. distribute your heat and load.
I was also thinking of either mineral oil or baby oil for insulating and cooling rapidly heating components (like lgbt & mosfets), volume of liquid container... or things like (thermoelectric) peltier junction coolers
what kind of coils are you using? is it cored? toroid?
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
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Posts: 874
Will have to build them but looking at a rought spec of 400 amps 0.5-1uH, will then add about four or five in series, aiming for about 5-10 joules per block.
Use straight wire inductance foumla should get pretty close to those values.
Will proable make it out of steel, as the frequency wont be a proabling, maybe one to two turns of 50*3 mm plate bar, design with cooling as the main consideration.
Scr can handle the amps, but dont think I can use them in this case.
What would I be looking at to parrellel Igbts, make model of the switch, I think I can do some tests with four lead acid batterys, and learn how to design them
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
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Posts: 874
Got some gear, will need some moe ipf540n, for paralleling this, I saw from a post early about youtube, and that you need a singal gate drive per mosfet,
Just wondering what other things you need to parallel them
Registered Member #54441
Joined: Mon Feb 09 2015, 11:33AM
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Posts: 9
The higher the frequency the more need to use ferrite materials, molecular structure of material determines frequency. take a look at magnetic fields switching on iron. this will give you a guess of the heat dissipation.
there are really good magnetic field simulation software available, allows you to build your device and test it for any parameters. like temperature and field strength etc... lots of good electronic workbench programs do this too. you can then simulate everything and test it before building it.
electronic workbench programs
free magnetic mapping tool
Also- i would build a single demo one just for testing and working out the bugs... get all the bugs worked out on one single thing...write down all your values and play to make it better before moving on. makes everything easier. also saves the wallet...
i find "google images" for finding circuits to be very valuable, i can easily spent hours looking at circuits...
do a search for - igbt. scr and mosfet parallel circuits to give you ideas.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
Thanks Fred Search on google, and noticed something thats strange, why does parallel mosfet driven with a series gate signal, with resistor between each mosfet in the chain.
How would you select the value, is it just to stop inrush current? Wouldnt it make a voltage divider, or is that the reason to balance the voltage?
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Driving a Igbt
