Study On Inductance Of Inductance Coil Distributed Capacitance And Alternating Magnetic Field

With the development of modern power electronic technology, electronic product development of high frequency has become a trend, but the subsequent effect of element distribution parameters in high, frequency and puts forward a new research topic to the people. In high frequency, inductance coil in addition to the need to consider the perceptual characteristics of itself, the distributed capacitance needs to be considered also.In the process of magnetic core excitation coil inductance tend to take the pulse magnetic permeability, and according to the definition of pulse magnetic permeability, it is difficult to give dynamic curve of inductance, so the ac magnetic core inductance calculation method is necessary.This paper firstly introduces the current research status of distributed capacitance and inductance coil inductance.Detail what is distributed capacitance, analyzes the influence of distributed capacitance on the circuit, and to establish a simplified model for calculating the distribution of capacitance inductance coil.Equivalent circuit analysis shows that interlayer capacitance is the main part of the distributed capacitance of inductance coil. According to the principle of the energy of electric field is determined by the electric field distribution, the electric field energies of both kinds of coils winded with "Z" and "U" types were analyzed, and their expressions of the equivalent distributed capacitances are derived, respectively.Some experimental method of measuring capacitance inductance coil, are Introduced, and this article’s method to calculate the distribution of capacitance inductance coil is proved to be correct by "the effective inductance measurement under different frequency method".The coil inductance calculation expression in the constant magnetic field is deduced, and then the nonlinear of core coil inductance in changing magnetic field has been discussed in detail. The calculating formula of dynamic inductance coil which is fit for ac magnetic core or pulse excitation conditions is deduced based on the definition of inductance.The distributed capacitance calculation expression of inductance coil clearly established the relationship between the distributed capacitance of coil and the structure parameters such as the number of coil layers, so it’s convenient to guide inductor and filter design, can also be used to estimate transformer distributed capacitance, etc. For core coil, in the process of excitation inductance tend to take the pulse magnetic permeability, difficult to give a dynamic inductance curve, but the calculating formula of dynamic inductance coil which is fit for ac magnetic core or pulse excitation conditions is given in this paper.