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well I had 4 450V 2400uf caps and I needed a new filter on the full bridge doubler so I built this I am wondering at 900V 2400uf cap is enough I will be running it at doubled 120 AC so 340VDC Also if the copper bus bar construction is adequate? This is for a full bridge DRSSTC that I have been working on.
also latest pic before the filter caps blew up of my DRSSTC
thanks,
Daniel
edit
do I need an inrush current limiter or is it ok if the lights dimm?
true but I need a voltage doubler I was thinking of running it off the 240V line but I didn't want to go through the trouble of always getting to one of those outlets I only have 2 in my house.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
All 4 caps are probably overkill for the size of IGBT you are using, but they should be adequate in either doubler (2400uF) or all parallel (9600uF). Keep the wiring between the caps and the IGBTs as short as possible. I try to integrate the cap's bus wiring to the IGBT wiring so there are at most a few inches of wire between the two.
here is how I made it I am almost done I just need to mount the components on the other half bridge witch will come in tomorrow via UPS so I should be able to have it done by Thursday because I need to build a larger box to house everything. Dose everything look right from my pics I tried to minimize inductance.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Surely you can reduce the length of the bottom right buss bar. Use thin plastic as insulation between the copper bar and the PCB where necessary. Its not good to have the bus bar routed so far out of the way. The left side looks very good.
Of course, those caps are wired in series/parallel (instead of just parallel like you said you were going to do) but they should still be fine, and could be used for a voltage doubler still.
I will try to re route the long bus bar after I mount the heat sinks then I will know where to leave open. Also the caps are going to be used as a voltage doubler otherwise I would have had then all in parallel.
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Adequate Filter capacitance?
