Computing method of consumption of Buck changer's magnetic core

A technology of magnetic core loss and calculation method, applied in calculation, instrumentation, design optimization/simulation, etc., can solve problems such as practical application difficulties, multi-material parameters of the model, etc., and achieve the effect of clear physical concept and simple calculation process

Inactive Publication Date: 2017-08-04
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The physical model of magnetic loss provides a theoretical basis for modeling and analysis of magnetic element loss under various operating conditions of switching converters, but its main disadvantage is that the model contains too many material parameters, which brings difficulties to practical applications

Method used

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  • Computing method of consumption of Buck changer's magnetic core
  • Computing method of consumption of Buck changer's magnetic core
  • Computing method of consumption of Buck changer's magnetic core

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Experimental program
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Embodiment Construction

[0029] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0030] Such as figure 1 The Buck converter shown works in CCM mode, the inductance is positively excited during the conduction period of Q1, and the magnetic flux variation is

[0031]

[0032] During the cut-off period of Q1, the inductor reversely demagnetizes, and the flux change is

[0033]

[0034] The eddy current loss in the magnetic core per unit volume of the Buck converter can be expressed as:

[0035]

[0036] In the formula, R e is the core equivalent resistance. Eddy current loss under different duty cycle conditions Eddy current loss with D=0.5 square wave excitation The relationship is:

[0037]

[0038] Assuming that D=0.5, the eddy current loss is 1, and the change trend of the eddy current loss of the magnetic core under different duty ratio conditions is as follows image 3 shown. The ratio of eddy current l...

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Abstract

The invention discloses a computing method of consumption of Buck changer's magnetic core. When duty ration is equal to 0.5, flux density variation should be confirmed. By analyzing the operating principle of Buck changer's circuit, a relational expression between hysteresis loss and the duty ration and a relational expression between eddy current loss and the duty ration are established. As the duty ratio changes, the changing law of the loss of Buck changer's magnetic core should be estimated. The computing method of consumption of Buck changer's magnetic core has the advantages of being clear in physical concept and being simple in computing process. The computing method of consumption of Buck changer's magnetic core can effectively estimate the consumption of the magnetic core in Buck changer's output inductor under the condition of different duty ratio.

Description

technical field [0001] The invention relates to a method for calculating the core loss of a Buck converter, in particular to a method for calculating the high-frequency ferrite core under different duty cycle conditions. Background technique [0002] Magnetic components are mainly used as transformers and power inductors in high-frequency switching converters. Power magnetic components have a decisive impact on the performance and reliability of switching converters, and unreasonable magnetic component design will cause switching converters to fail. Switching frequency f, magnetic flux density variation B pp , duty cycle D, DC bias H DC , temperature T and other working conditions will have a direct impact on the power loss of magnetic components, which brings significant difficulties to the modeling of core loss. even in B pp Under the same conditions, the core loss will also be affected by the DC bias H DC and the significant effect of excitation waveform changes. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 周岩张宇飞高宁
Owner NANJING UNIV OF POSTS & TELECOMM
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