Magnetic ring common mode inductor electronic component manufacturers should not be unfamiliar, but when it comes to the relationship between its inductance and the number of turns, it is completely confused.

First, the relationship between the common mode inductance of the magnetic ring and the number of turns?

  The relationship between the inductance and the square of the turns:

  The inductance of the common mode inductor of the magnetic ring is proportional to the square of the number of turns, that is, the inductance is proportional to the square of the number of turns, and the inductance of each turn is also related to the core size and quality. The calculation formula is: l = (0.01 * D * N * N) / (L / D + 0.44), where the coil inductance l unit: micro-henry, magnetic ring common mode inductor coil diameter D unit: cm, the number of turns of the inductor coil N unit: turns, coil length L unit: cm.

If the number of winding turns is increased under the condition that the iron core is unchanged, it can provide greater inductance and more abundant electrical energy. Under the condition that the winding is unchanged, the sheet iron core has less magnetic eddy current and lower loss Can pass higher frequencies. However, the number of gaps is large, and the magnetic circuit is also long. Many people pursue low internal resistance for better high frequency response and large inductance.

2. What is the relationship between the inductance of the common mode inductor of the magnetic ring and the number of turns?

1.Relationship between inductance and turns

  The relationship between the inductance and the number of turns is squared, that is to say, the inductance is proportional to the square of the turns and has nothing to do with the number of turns per volt of the common mode inductance of the magnetic ring.

  The number of turns per volt of the magnetic ring inductor is related to the size and quality of the iron core, and the amount of inductance per turn is also related to the size and quality of the iron core. A transformer with more turns per volt has a smaller inductance per turn.

2. If the core is unchanged, increasing the number of winding turns can provide greater inductance and more abundant electrical energy.

  In fact, this is an advantage, but it also increases internal resistance, which is a disadvantage. With the same windings, the lamellar core has less eddy current, lower loss, and can pass higher frequencies. However, the number of gaps is large, and the magnetic circuit is also long. Many people pursue low internal resistance for better high-frequency response and large inductance to get more current to increase the sense of low frequency. "The more heat will be smaller, the internal resistance will be larger, the power will be smaller, and the dynamics will be affected. The more primary turns, the larger the inductance, the greater the obstacle to AC, so excessively increasing the number of turns will inevitably lead to output Power drop and high current supply.

  The relationship between the common mode inductance of the magnetic ring and the number of turns is related to the core size and quality factors. Inductance manufacturers should pay attention to all aspects of the details!