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There are special common mode choke coil that are often required to be customized, which requires the calculation of the inductance. But the calculation of the amount of inductance is more complex, the general use of empirical formula.

In addition, the relationship between the inductance and the number of turns of common mode choke manufacturers to note is:

1, the inductance and the number of turns into the square ratio of the relationship, that is, the inductance and the square of the square is proportional to the number of turns per turn inductance and core size, quality.

2, if the core in the case of the same, increase the winding turns, can provide greater inductance and more abundant power, which is the advantage, but increased the internal resistance it is a disadvantage. In the case of constant winding, the sheet core has less magnetic eddy current, lower losses, through a higher frequency. But the gap is large, magnetic circuit is also long. Many people pursue low internal resistance to get better high frequency response, the pursuit of large inductance, in order to get more current to increase the sense of low frequency. "The more heat will be small, the internal resistance will become larger, the power becomes smaller, the greater the number of laps. The greater the number of turns, the greater the amount of inductance for the exchange of obstacles, so the excessive number of turns is bound to lead to output power Down and offer high current.

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