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Calculation method of core loss of high frequency transformer

A high-frequency transformer, core loss technology, applied in the direction of calculation, instrument, design optimization/simulation, etc., can solve the problems involving many parameters, low calculation accuracy, seldom used, etc., to achieve accurate calculation and make up for the magnetic core Effect of loss, effect of improved excitation conditions

Active Publication Date: 2018-12-28
SHENYANG POLYTECHNIC UNIV
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AI Technical Summary

Problems solved by technology

[0004] Although the traditional loss separation method is more accurate for the calculation of eddy current loss and additional loss, it is rarely used in actual calculations because of the many parameters involved and the extraction method is complicated.
The classic method of high frequency loss density - Steinmetz (Steinmetz) formula is widely used in engineering, but it is only used in the case of sinusoidal excitation, and the calculation accuracy is not high

Method used

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  • Calculation method of core loss of high frequency transformer
  • Calculation method of core loss of high frequency transformer
  • Calculation method of core loss of high frequency transformer

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Embodiment Construction

[0040] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0041] Such as figure 2 The shown transformer works in a high-frequency environment, the input waveform is a triangle wave, and the initial temperature of the transformer core is 25°C.

[0042] Such as image 3 Shown in COMSOL to establish a high-frequency transformer core loss thermal model.

[0043] Input corresponding excitation for temperature field simulation analysis, get T 1 .

[0044] Then the temperature coefficient T can be obtained * for:

[0045]

[0046] Integrating the positive half-period of a sinusoidal waveform is:

[0047]

[0048] Since the input waveform is a triangular wave, the triangular wave function can be obtained as:

[0049]

[0050] The positive half-period integral of formula (3) is:

[0051]

[0052] From formula (2) and formula (4), the form factor λ can be obtained * for:

[0053]

[0054] ...

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Abstract

The invention discloses a method for calculating the magnetic core loss of a high-frequency transform, relates to two important parameters T*, lambda *. Temperature coefficient T*. The parameter is the temperature specific gravity of the core at room temperature and the temperature rise in the operating environment. The parameter is an important factor in the present invention because the temperature of the transformer core increases during operation and the temperature causes a change in the loss. Compared with the original Steinmetz formula, the invention adds the temperature coefficient andthe waveform coefficient parameter, compensates the influence of the temperature change on the magnetic core loss, improves the excitation condition of the waveform, and makes the calculation of themagnetic core loss more accurate.

Description

technical field [0001] The invention relates to the field of magnetic core loss calculation, in particular to a calculation method for magnetic core loss applied in a high-frequency environment. Background technique [0002] Magnetic components including transformers and inductors perform the functions of galvanic isolation, harmonic filtering, energy storage and parameter matching of power stages and control circuits in power converters, and they usually determine the size of the converter. With the rapid development of electronic information technology, power systems for various small and lightweight electronic devices emerge in an endless stream. [0003] With the continuous increase of operating frequency, electronic equipment is developing towards miniaturization, so it is necessary to pay attention to the selection of magnetic core materials, and the magnetic core loss is one of the characteristics of the magnetic core material and one of the important losses that affe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20Y02E60/00
Inventor 王湘明张振强陈哲邢作霞
Owner SHENYANG POLYTECHNIC UNIV
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