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Original question:

LDC1614: LDC1614 Coil Design Questions.

LDC0851: Coil Design Questions.

Matheus Tenorio dos Santos
Prodigy 30 points
Part Number: LDC0851

Hi Everyone,

I have been working on a flow meter application. I used LDC0851 for count the number of times the target pass by the coil. The distance between the coil and the target must be 5mm, on minimum.  The target is composed of a thin metal piece. This piece has the shape of 1/3 of the circumference (See image below), with the radius of 7mm. The target cannot be modified (Application restriction).

So, my question is:
What is the ideal diameter and fill ratio of the sensor coil such that the minimum switch ON distance is 5mm, using LDC0851.

If anyone has any theoretical document to help me with this problem, I will be very grateful.

Thanks!

  • 0
    TI__Mastermind 23810 points
    To do this, you will need to put in two coils, each with an approximate diameter of 7mm. You can use the LDC tools excel file to help with your design:

    www.ti.com/.../slyc137

    The webench coil design tool might help as well.

    The output of the LDC0851 will switch depending on if the target is covering the reference coil or the sensor coil. Try and design your coils as large as possible, but so that the target will completely cover it when it is over the sensor coil.