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It is true that running at a higher switching frequency allows you to reduce the inductor size.
Some years ago, I made a 1kW boost converter for a lithium battery charger. At the time, Infineon made an excellent control IC that was made specifically for a MPPT, high power factor, high efficiency boost converter. At the time I used a SiC diode, but SiC Mosfets weren't available.
They had excellent app notes regarding inductor sizing and the frequency relationship.
The DS pic would be quite capable of doing this. I don't see why an ARM or ST controller is necessarily better.
It may be possible to use a stand-alone controller with simple controls that could be administered by the main motor controller.
- E*clipse
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