Coupling inductor applicable to multi-phase interleaved parallel converter

Abstract

The invention discloses a coupling inductor applicable to a multi-phase interleaved parallel converter. A structure of the coupling conductor is mainly formed by combining backcoupling transformers consisting of two phases of windings and an energy storage inductor; for an n-phase interleaved parallel converter, the quantity of the backcoupling transformers is n-1 or n or n(n-1) / 2, and the connection relation of the backcoupling transformers is a central type or a head-tail closure type or a two-two combination type respectively; and the energy storage inductor is serially connected with at least one phase of the winding in the backcoupling transformers, the winding quantity of the energy storage inductor is between 1 and n, and various phases of the windings of the energy storage inductor are independent from each other or are subjected to forward coupling. The coupling inductor ensures that an energy storage function and a filtering function are borne by the energy storage inductor and the backcoupling transformers respectively by splitting the energy storage function and the filtering function, can effectively avoid the intrinsic contradiction between the energy storage function and the filtering function in a multi-magnetic circuit magnetic core, further reduce the loss and volume of magnetic components, improve the power density, the conversion efficiency and the output dynamic performance of the converter, and is suitable for the multi-phase interleaved parallel converters.

Description

technical field [0001] The invention relates to a coupled inductor suitable for use in multi-phase interleaved parallel converters, belonging to the field of inductors or voltage conversion. Background technique [0002] In a switching power supply, the filter inductor plays a very important role in filtering and energy storage, but there is a contradictory relationship between these two functions: under the premise of ensuring that the number of turns of the filter inductor and the maximum The greater the average current passing, the greater the reluctance of the magnetic core is required, that is, the smaller the inductance value of the filter inductance, and to improve the filtering ability, the greater the inductance value of the filter inductance is required. In order to alleviate these two contradictions, the method of keeping the reluctance constant and increasing the effective permeable area, that is, increasing the volume of the magnetic parts, is usually adopted. ...

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Problems solved by technology

[0005] In order to apply the reverse coupling method to multi-phase interleaved parallel converters to improve the steady-state performance and dynamic performance of the converter, Zumel P, Garcia O, Cobos J.A, Uceda J. Magnetic Integration for Interleaved Converters. Proc. IEEE APEC, 2003: 1143 -1149. It is proposed to use a pair of multi-magnetic circuit magnetic cores to realize the integration of all inductors, which reduces the volume of the magnetic core, but the magnetic core of this coupling method still undertakes the functions of energy storage and filtering at the same time, and there are two functions. Inherent contradiction, which restricts further optimization of the volume

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