Inductor Current

[iamakda]

I have an isolated dc dc boost converter whose average current is 100 A.

1). How can I find Peak to Peak current of indcutor that is DELTA I (pk-to-pk)?
2). How can I find Peak current of inductor?

Any suggestions?

Thanks.

[iamakda]

Re: Inductor Current

Same question with more clearification:

I have an isolated dc dc boost converter whose inductor's average current is 100 A.

1). How can I find Peak to Peak current of indcutor that is DELTA I (pk-to-pk)?
2). How can I find Peak current of inductor?

Any suggestions?

Thanks.

[tom66]

Re: Inductor Current

With a Hall probe.

[iamakda]

Re: Inductor Current

With a Hall probe.

Actually I want to calculate it.....not to measure it....

[tom66]

Re: Inductor Current

Actually I want to calculate it.....not to measure it....

How have you created and isolated -boost- converter? Am I misunderstanding, but isn't a boost converter a nonisolated topology?

To calculate peak-to-peak current:

You need the operating frequency of your converter and the inductance.

Voltage induced across inductor = Inductance * (change in current / change in time)

If you know the operating frequency (change in time), the voltage across the inductor (input-output difference) and the inductance it is a simple matter of rearranging the equation:

Voltage induced across inductor / (Inductance * Change in time) = Change in current

This assumes continuous conduction mode... discontinuous mode is different.

Peak current of inductor will be average current of inductor plus half the peak-to-peak amplitude. (approx)

Please note I have only a rudimentary knowledge of SMPSs, so what I just said might be wrong.

[popeye]

Re: Inductor Current

Hi iammakda

attached pdf of basic formulas.

[iamakda]

Re: Inductor Current

Hi iammakda

attached pdf of basic formulas.

Many thanks.