UCC28950: Current transformer dotting

Furkan Eroglu

Part Number: UCC28950

Hi team!

I've a issue with the current biasing point of the current transformer let me explain as follow in the picture below.

As you can see the normally operations is drawed with the blue arrows the current is coming from the dc link and is going from 11 to 12 primary and in the secondary is going from the dotting point to the rectifier diode.

But what if the current is going from 12 to 11..
Is the secondary side good designed in the first picture or do you suggest the design in the picture below or maybe another suggestions?

Thank you team!

over 5 years ago

0 Colin Gillmor over 5 years ago

TI__Mastermind 25570 points

Hello Furkan

Assuming that the CT is placed in the path between the DC link and the H bridge then the CT may be used in either polarity but the secondary rectifier must be changed. Your third sketch is correct - I've added the necessary reset path (resistor) and the polarity of the resulting CS signal to your sketch below.

Here's the schematic showing where I have assumed the CT to be placed.

Regards

Colin

0 Furkan Eroglu over 5 years ago in reply to Colin Gillmor

Prodigy 120 points

Oh! one last the question.
forgive me for asking like this sır.
Finally , this is the circuit when I add my own Current transformer the circuit will be like this with this dot convention.
this circuit will work I'm right?