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Method for calculating magnetic core loss of Flyback converter

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

Inactive Publication Date: 2018-09-07
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
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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 Flyback converter
  • Method for calculating magnetic core loss of Flyback converter
  • Method for calculating magnetic core loss of Flyback converter

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Embodiment Construction

[0028] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] The Flyback converter magnetic core loss calculation method described in the present invention combines the physical mechanism of magnetic core loss and the operating characteristics of the Flyback converter circuit, and utilizes the advantage of the clear physical concept of the magnetic loss separation method to establish the Flyback converter power inductance in different occupations. The magnetic loss model under the condition of empty ratio.

[0030] The method of the invention uses the loss data of the Flyback converter when the duty ratio D=0.5 under the given working conditions of DC bias, frequency and magnetic flux density variation to predict the magnetic core loss at different duty ratios.

[0031] Specific steps are as follows:

[0032] (1) Determine the duty cycle range of the magnetic core according to t...

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Abstract

The invention discloses a method for calculating magnetic core loss of a Flyback converter. Under the condition of determining a magnetic flux density change quantity when a duty ratio D is equal to 0.5, a working principle of a circuit of the Flyback converter is analyzed, and a relationship among magnetic hysteresis loss, eddy current loss and the duty ratio is established, so that a magnetic core loss change law of a magnetic core during change of the duty ratio of the Flyback converter is predicted. The method is clear in physical concept and simple in calculation process, and can effectively predict loss values of a magnetic core material in an output inductor of the Flyback converter under the condition of different duty ratios.

Description

technical field [0001] The invention relates to the field of magnetic components of high-frequency switching converters, in particular to a calculation method for magnetic core loss of a Flyback converter. Background technique [0002] In high-frequency switching converters, magnetic components are mainly used as transformers and power inductors. Power magnetic components have a decisive impact on the performance and reliability of switching converters. 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. [0003] At present, ...

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
Owner NANJING UNIV OF POSTS & TELECOMM
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