Design method of coupling inductor with adjustable coupling coefficient

Abstract

The invention discloses a design method of a coupling inductor with an adjustable coupling coefficient. The method comprises the following steps: (1) obtaining a magnetic resistance expression from a magnetic circuit model; (2) obtaining a circuit model through equivalent transformation of a magnetic circuit; (3) obtaining an expression of self-inductance and mutual inductance values through a circuit model; (4) substituting a required self-inductance value and a mutual inductance value into the expression in the step (3) to solve basic parameters; (5) performing simulation verification. The method is simple and convenient in design, and the coupling coefficient is convenient to control; the coupling inductor structure can reduce material consumption and reduce the cost of a magnetic piece. And the application requirements in three aspects of efficiency, cost and volume can be considered.

Description

technical field [0001] The invention relates to the technical field of coupled inductors, in particular to a design method for coupled inductors with adjustable coupling coefficients. Background technique [0002] Although the interleaved parallel technology solves the problem of increasing output power of the DC / DC converter, it doubles the number of magnetic elements in the converter, thereby increasing the volume, weight and cost of the converter. In order to reduce the number of magnetic components in the converter, the magnetic components in the converter can be integrated, that is, magnetic integration technology is used. By adopting this technology, not only can the problem of large volume and quantity of magnetic components in the converter be solved, but also the steady-state and transient performance of the circuit can be improved. [0003] Traditional coupled inductors have the problem of 1. The relative concentration of windings and magnetic circuits leads to un...

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Problems solved by technology

[0003] Traditional coupled inductors have the problem of 1. The relative concentration of windings and magnetic circuits leads to uneven distribution of magnetic pressure, excessive eddy current loss, core loss and electromagnetic interference of magnetic parts

2. The magnetic circuit model is too complex, the edge and air gap reluctance is difficult to calculate, and it is not suitable to realize the symmetrical coupling of the winding

3. Many problems such as high cost, difficult heat dissipation, and difficult factory production

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