LDC1614EVM: calculation of total inductance from target interaction

František Andrejka

Part Number: LDC1614EVM
Other Parts Discussed in Thread: LDC1614

Hello everyone,

I am planning work with LDC1614 eval board with a custom planar coil. Now I am dealing with calculation of inductance of coil as well as influence of target distance to total inductance. LDC_Tools-ext51 provide these information, but cells are locked so I can not see equations and I would like to better understand. I found many equations to calculate inductance of coil from geometry, but not for relation between coil an conductive target. Do you have some papers that dealing with calculation of total inductance according distance of target.

Regards,

Frantisek

over 1 year ago

0 John Miller - Sensing over 1 year ago

TI__Mastermind 35885 points

Frantisek,

A couple of IEEE papers may help:

1. On the Relationship of Quality Factor and Hollow Winding Structure of Coreless Printed Spiral Winding (CPSW) Inductor
URL: https://ieeexplore.ieee.org/document/6069869

2. Simple Accurate Expressions for Planar Spiral Inductances
URL: https://ieeexplore.ieee.org/document/792620

They don't have all the answers, but they should help.

Regards,
John

0 František Andrejka over 1 year ago in reply to John Miller - Sensing

Prodigy 10 points

Thanks John,

I am familiar whit these articles. You are right, there are very helpful but not answer to main question how a conductive target interacts with the coil.

Regards,

Frantisek

0 John Miller - Sensing over 1 year ago in reply to František Andrejka

TI__Mastermind 35885 points

Frantisek,

I will need to investigate further, and will update this thread with the findings by the end of the day on Wednesday of next week.

Regards,
John

0 John Miller - Sensing over 1 year ago in reply to John Miller - Sensing

TI__Mastermind 35885 points

Frantisek,

The equations used in the tool result from a combination of analysis and experimental results.
We tend to not share the details, and because of this, do not have any collateral that describes the equations or their development.

Regards,
John

0 František Andrejka over 1 year ago in reply to John Miller - Sensing

Prodigy 10 points

John,

I understand, Anyway Thank you for your effort to try solve my problem.

Regards,

Frantisek

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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LDC1614EVM: calculation of total inductance from target interaction