3 Phase Inverter with braking diodes

[alexplace2001]

3 phase inverter

Hello

I've seen that some 3 phase bridge topologies use three extra diodes in serires in the branch. This topology is shown in the image bellow.

For a BLDC motor drive, will this topology help to handle back EMF?
will this make a more robust brige?
what other considerations should be taken, to implement this?

Thanks in advance.

Alex

 

[FvM]

inverter braking

As one basic effect of the diodes, you're producing a risk to damage the high side transistors by overvoltage. The circuit also doesn't allow meaningful pwm operation. Unless you don't know, that the circuit is from a trustworthy source, you should better ignore it.