PDA

View Full Version : BLDC app and bootstrapping



jml1006
Aug 12th, 2013, 02:22 PM
I'm evaluating the BLDCBCH03 app with the XMC1300 and PMSM eval board. I cannot find reference to any function for charging the bootstrap capacitors when starting the motor. Is there a method for charging these caps that I am overlooking?

I understand the caps could be charged through the motor winding when a single lower-leg is fired, during normal conduction in any single sector, but this would not seem ideal for starting the motor. Typically, all three bottom legs are pulsed to charge the bootstrap caps, before the motor is commutated.

I would appreciate any insight.

Regards,
Joshua

Jackson
Aug 14th, 2013, 07:15 PM
Hi Joshua,

We are looking into this now.
Will update you once we have the solution.

elegantk
Aug 19th, 2013, 10:36 PM
Please try out the attached workaround for charging the bootstrap capacitor