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H-Bridge Braking (IFX9201SG)
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normalverbraucher:
Hi,

I have been playing around with the Infineon IFX9201 Integrated H-Bridge lately, and I was unable to figure out how to brake a DC motor with this IC. There is no brake functionality specified in the datasheet (see attached pic).
Does anyone know of an easy way to quickly stop a DC-motor with this chip?
soldar:
Reverse?
Etesla:
I think it depends on the direction the motor was already spinning.

Say you had HS1 and LS2 on, and then you wanted to break the motor. To break, you would turn off HS2 and LS2, and turn on just LS1. This would provide a reverse current path through LS1, through the diode in LS2, and through the motor, in the opposite direction breaking it.
The other case would be having HS2 and LS1 on to start, and then to break, turning off HS2 and LS1, and turning on just LS2.

I think turning on LS1 and LS2 at the same time for breaking would also work for both starting cases, even though one of the mosfets still shouldn't actually be conducting a whole lot during that time, but this simplification may be worth it.

I have never tried this, but this link makes me thing that this may work:
https://electronics.stackexchange.com/questions/56186/how-can-i-implement-regenerative-braking-of-a-dc-motor
Benta:
What the data sheet calls "Free Wheeling" is actually braking.
pwlps:

--- Quote from: Etesla on May 07, 2019, 03:52:09 pm ---I have never tried this, but this link makes me thing that this may work:
https://electronics.stackexchange.com/questions/56186/how-can-i-implement-regenerative-braking-of-a-dc-motor

--- End quote ---

Yes, this article explains it very nicely. So to enable breaking the PWM should switch very fast between "forward" and "free wheel forward" (and this is what we see in the driver truth table).  If the PWM frequency is high enough (relative to the L/R time constant of the motor) then on  decreasing the PWM duty cycle the motor will act as a buck–boost converter, supplying current to the PS (this is regenerative braking - check if the PS can accept reverse current).  So in principle there is nothing special to do, progressively decreasing the PWM duty cycle will enable breaking.
This won't work anymore when the motor EMF drops below the diode threshold, but then you can probably safely switch to reverse.
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