Method for calculating magnetic core loss of Boost converter

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

Inactive Publication Date: 2017-08-18
NANJING UNIV OF POSTS & TELECOMM
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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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  • Method for calculating magnetic core loss of Boost converter
  • Method for calculating magnetic core loss of Boost converter
  • Method for calculating magnetic core loss of Boost converter

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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 Boost converter shown works in CCM mode, the inductance is positively excited during the conduction period of Q1, and the flux variation is:

[0031]

[0032] In the formula, V I Represents the input voltage, T represents the temperature, N represents the number of coil turns, A e Represents the cross-sectional area of ​​the magnetic core, and D represents the duty cycle.

[0033] During the cut-off period of Q1, the inductance demagnetizes in reverse, and the amount of flux change is:

[0034]

[0035] In the formula, V O represents the output voltage.

[0036] The eddy current loss in the magnetic core per unit volume of the Boost converter can be expressed as:

[0037]

[0038] In the formula, R e is the core equivalent resistance.

[0039] Eddy current loss under different duty cycle conditions Edd...

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Abstract

The invention discloses a method for calculating magnetic core loss of a Boost converter. Under the condition of determining a change quantity of magnetic flux density when a duty ratio D is equal to 0.5, by analyzing a working principle of a Boost converter circuit, a relational expression among magnetic hysteresis loss, eddy current loss and the duty ratio is established, and a magnetic core loss change law of a magnetic core when the duty ratio of the Boost converter is changed is predicted. The method has the advantages that a physical concept is clear; a calculation process is simple; and the loss of a magnetic core material in an output inductor of the Boost converter under the condition of different duty ratios can be effectively predicted.

Description

technical field [0001] The invention relates to a calculation method for magnetic core loss in a Boost converter, in particular to a calculation method for high-frequency ferrite magnetic cores 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 周岩陈麒米张宇飞
Owner NANJING UNIV OF POSTS & TELECOMM
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