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Hello Chris,
Sorry I have not responded sooner. My wife has been in the hospital and i have been taking care of her since she got home. She will be ok, just got a bit of recovery ahead of her.
The whole igbt module is used, but only 1 switch is used. The other switch is used only for its reverse diode. This allows one module to provide all power stage functions.
As for the capacitor location, It is across the batter terminals. It needs to be located as close to the switching device as possible. Also, you want to keep in mind that you want to create the smallest inductive loop as possible. The cap absorbs the voltages spikes so the batteries dont have to, and also keeps huge current spikes from being pulled from the batteries.
I have though about designing a 2 module version of the driver board but this is as small as it can go. The VLA-500 and support circuitry is too large to go any smaller then 2 modules and this is eve pushing it.
I dont think I have posted the files yet, But i have thought about setting up a group buy if there is enough interest.
-Adam
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