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A Calculation Method of Boost Circuit Magnetic Core DC Bias Coefficient

A DC bias and coefficient calculation technology, applied in computer-aided design, DC power input conversion to DC power output, electrical components, etc., can solve the problems of not considering the change rate of magnetic flux density and the loss value can not meet the requirements, etc., to achieve The effect of clear physical concept and simple calculation process

Active Publication Date: 2020-11-10
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In addition, the SE equation only reflects the characteristics of the frequency and does not consider the rate of change of the magnetic flux density, so it can only provide accurate loss estimates in the sinusoidal case of a certain magnetic flux density, frequency and temperature range
Therefore, for magnetic components under actual complex working conditions, the loss value predicted by the SE equation cannot meet the requirements

Method used

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  • A Calculation Method of Boost Circuit Magnetic Core DC Bias Coefficient
  • A Calculation Method of Boost Circuit Magnetic Core DC Bias Coefficient
  • A Calculation Method of Boost Circuit Magnetic Core DC Bias Coefficient

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Embodiment Construction

[0020] In order to make the content of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0021] like figure 1 The Boost converter shown works in CCM mode. When Q1 is turned on, the magnetic flux variation is:

[0022] When Q1 is off, the amount of flux change is:

[0023] The current change of the core inductance as figure 2 As shown, I av.in is: the average input current of the inductor, Ι 0 is: the load current; η is: the efficiency of the system; when there is a DC bias, the expression of the DC bias factor is:

[0024] When D=0.5, the DC bias coefficient B DC =1.

[0025] like image 3 As shown, the DC bias coefficient in the Boost converter increases rapidly with the increase of the duty cycle.

[0026]

[0027] To sum up, we fully combine the actual working charact...

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Abstract

The invention discloses a method for calculating the DC bias coefficient of a Boost circuit magnetic core. Under the condition of the magnetic flux density variation when the duty ratio D=0.5, by analyzing the working principle of the Boost converter circuit, the calculation method of the magnetic core in the Boost conversion The variation law of the DC bias coefficient when the duty cycle of the converter is changed. The invention has the advantages of clear physical concept and simple calculation process, and can effectively predict the magnitude of the DC bias coefficient of the magnetic core material in the output inductance of the Boost converter under different duty cycle conditions.

Description

technical field [0001] The invention relates to a calculation method for a DC bias coefficient of a Boost circuit magnetic core, in particular to a calculation method for a DC bias coefficient under different duty cycle conditions. Background technique [0002] As inductors and transformers operate at higher frequencies, ferrite losses become a major limiting factor in their engineering design. Operating conditions such as flux density, frequency, duty cycle, temperature, excitation voltage, and DC bias all have a direct impact on the power loss of a magnetic component, making modeling core losses extremely difficult. [0003] In the practical application of core loss prediction, the Steinmetz (SE) equation based on experimental data fitting is commonly used. The classic SE equation uses three coefficients to fit the loss value of the core material under sinusoidal excitation conditions at different frequencies and flux densities, which has the advantages of fewer parameter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158G06F30/20
CPCH02M3/158G06F30/20
Inventor 田家良王奔崔林威周岩张宇飞
Owner NANJING UNIV OF POSTS & TELECOMM