How to calculate the number of turns of wireless charging coil winding?

How to calculate the number of turns of wireless charging coils is a very important thing?

1、 How to calculate the number of turns of inductance in the winding coil of a wireless charging coil?

Step 1: Remove the power inductor coils that have been incinerated and cut them horizontally. Take 20 turns each at the bottom, middle, and top layers (after cutting, it becomes 20 pieces, that is, take out 20 metal wires in three layers). To be very accurate, samples can be taken from multiple layers and placed on a balance for weighing separately; Add up the weight of the three layers and divide by 3 to reach a uniform weight of 20 turns (in grams).

Step 2: Weigh the total weight (in grams) of the old coil's metal wire, snow washing coil fan bones, and insulation material on a unified balance.

Step 3: Use the formula to calculate the total number of turns N of the SMT inductor coil:

N=total weight of the entire old coil wire, uniform weight of 20 turns of old wire x 20

Hall effect measurement of coil turns



2、 Test the magnetic induction strength technique for the number of turns of wireless charging coil winding?

Measure the magnetic induction intensity at each point on the axis of the current carrying circular inductor coil and Helmholtz coil

When measuring the current I=300 mA, measure the magnetic induction intensity B1 at each point on the axis of the magnetic ring inductor coil 1. Require a set of data to be measured every 1.00cm interval.

2. The distance between wireless charging coil 1 and wireless coil 2 is equal to the radius of the coil, that is, d=R. Take the current I=300mA and measure the magnetic induction intensity B1 and B2 at each point on the axis when coil 1 and coil 2 are separately energized (with the same current direction). Then, there is a current I=300mA of the same size and direction passing through the two coils. Measure the magnetic induction intensity B1+2 at each point on the axis of the Helmholtz coil.

3. Compare the magnetic induction intensity on the axis of a measurable circular coil with the results of theoretical calculations.

3、 What is the winding current of the wireless charging coil?

1. Draw a distribution diagram of magnetic induction lines on the axis plane of a current carrying circular coil.

The Helmholtz coil has a current of I=300 mA, and the magnetic induction intensity at each point on several straight lines parallel to the axis is measured.

2. When two circular wireless coils are connected with an equal current (I=300 mA) in opposite directions, measure the magnetic field distribution along their axis.

Cenko Inductor manufacturer has explained some commonly used techniques for the number of turns of wireless charging coils. If you have better ideas and insights, you can also communicate with us!