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Modeling method of multi-phase DCDC converter

A modeling method and converter technology, applied in the direction of conversion equipment with intermediate conversion to AC, can solve problems such as difficulty in modeling multi-phase DC-DC converters

Inactive Publication Date: 2021-05-28
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of difficult modeling of multiphase DCDC converters, the present invention proposes a modeling method of simple and accurate multiphase DCDC converters

Method used

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  • Modeling method of multi-phase DCDC converter
  • Modeling method of multi-phase DCDC converter

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing and specific embodiment the technical scheme of the present invention is described in detail:

[0034] The steps of the technical solution of the present invention are as follows, as attached figure 1 Shown:

[0035] Step 1: List and write the multiphase DCDC conversion circuit switching vector differential equation

[0036] The polyphase DCDC circuit topology (for the known structure in the art) adopted by the model is as follows figure 2 As shown, the entire circuit contains M groups of coupled inductors, and each group of coupled inductors is composed of N mutually coupled inductors. Each phase inductor constitutes a boost circuit. By changing the number of mutual inductances and phases, it can evolve into a single-phase, magnetically integrated multi-phase circuit. There are many DCDC converter structures with multiple phases and coupled inductors.

[0037] The derivation process of the dynamic small-signal model c...

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Abstract

The invention relates to a modeling method of a multi-phase DCDC converter, which fully considers the problems of inductive coupling, stray parameters and asymmetry of the multi-phase DCDC converter, converts the multiply-accumulate process of a state equation into linear operation of matrix elements by utilizing the linear characteristic of a circuit differential equation, avoids the difficulty of small signal modeling of the multi-phase converter, and obtains a multi-phase converter state space model based on the improved switching period averaging method. According to the method, the complex intermediate process of average modeling of a traditional multiphase converter state space is eliminated, calculation is greatly simplified, good universality is achieved, and models of multiphase DCDC converters of different topologies can be established through the method.

Description

technical field [0001] The invention relates to a method for a multi-phase DC-DC converter, which can be used in the field of power electronic equipment. Background technique [0002] The limited capability of power electronic devices or power modules limits the power boost of DC / DC converters. In order to meet the high power and high power density requirements of the DC / DC converter of the fuel cell vehicle power system, a multi-phase parallel topology is usually used, and multiple groups of devices work together to realize the power demand. Multi-phase DC-DC converter has also become a research hotspot at home and abroad because of its characteristics of high power, high power density, flexible control and high reliability. [0003] There are two types of commonly used modeling methods for power electronic converters: theoretical modeling, which refers to switching cycle averaging and state space averaging; the other is network analysis based on simulation and testing. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28
CPCH02M3/28
Inventor 韦莉张逸成姚勇涛
Owner TONGJI UNIV