Calculation method for Boost circuit magnetic core direct current offset coefficient
A technology of DC bias and coefficient calculation, applied in calculation, electrical digital data processing, computer-aided design, etc., it can solve the problem that the loss value cannot meet the requirements, and the change rate of magnetic flux density is not considered, and achieves clear physical concept and calculation. Simple process effect
Active Publication Date: 2019-07-05
NANJING UNIV OF POSTS & TELECOMM
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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
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[0021] 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.
[0022] Such as figure 1 The Boost variator shown works in CCM mode. When Q1 is turned on, the magnetic flux variation is:
[0023] When Q1 is off, the amount of flux change is:
[0024] The current change of the core inductance as figure 2 As shown, I av.in is the average current in the inductor, when there is a DC bias, the expression of the DC bias factor is:
[0025] When D=0.5, the DC bias coefficient B DC =1.
[0026] Such as image 3 As shown, the DC bias coefficient in the Boost converter increases rapidly with the increase of the duty cycle.
[0027]
[0028] To sum up, we fully combine the actual working characteristics of the Boost converter and the physical essence of the h...
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The invention discloses a calculation method for a Boost circuit magnetic core direct current offset coefficient. Under a magnetic flux density variable quantity that a duty ratio D is equal to 0.5, the working principle of a Boost converter circuit is analyzed to calculate a direct current offset coefficient change rule of the of the magnetic core when the duty ratio of the Boost converter is changed. The method has the advantages of clear physical concept and simple calculation process, and can effectively predict the direct current offset coefficient of the magnetic core material in a Boostconverter output inductor under a condition of different duty ratios.
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...
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IPC IPC(8): H02M3/158G06F17/50
CPCH02M3/158G06F30/20
Inventor 田家良王奔崔林威周岩张宇飞
Owner NANJING UNIV OF POSTS & TELECOMM