TIDM817-current transformer resistor

Tevhide Dayioglu

Hello there,

I saw a resistor between seconder side of current transformer. I was wondering the reason for using this. Could you please explain this.

over 3 years ago

0 Cody Watkins over 3 years ago

TI__Mastermind 42195 points

I believe this can be answered by taking a look at the typical circuit diagram from the current sense transformer's Datasheet. It recommends using a termination resistor to adjust the ratio of Vout to Iin.

Regards,

Cody

0 Tevhide Dayioglu over 3 years ago in reply to Cody Watkins

Prodigy 10 points

I am sorry, There is a misunderstanding because of me. Let me correct.

I would like to ask that 20 ohms which have been paralleled before the rectification diode.

0 Cody Watkins over 3 years ago in reply to Tevhide Dayioglu

TI__Mastermind 42195 points

I think this would be there to ensure that the power can quickly be bled off. I would call this a burden resistor. However I was not involved in this design, the normal owner is on leave, so please allow me a day or so to look at why this was done.

Regards,
Cody

0 Tevhide Dayioglu over 3 years ago in reply to Cody Watkins

Prodigy 10 points

Hello Cody, did you have a chance to look at why?

BR

0 Cody Watkins over 3 years ago in reply to Tevhide Dayioglu

TI__Mastermind 42195 points

I have an inquiry out. Will report back soon.

0 Cody Watkins over 2 years ago in reply to Cody Watkins

TI__Mastermind 42195 points

I was unable to get a response. My assumption, which could be wrong, is that this was done as a way to discharge the rectified power. Without some load the response would not happen quickly enough to sample accurately. My believe is that when the sampled current is reducing the rectified voltage would lag behind as it slowly floated down from its previous level without this load.

Regards,
Cody

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TIDM817-current transformer resistor