Magnetic core high-frequency loss calculation method under symmetric/asymmetric rectangular voltage excitation

A rectangular voltage and high-frequency loss technology, applied in the field of high-frequency loss calculation of magnetic cores under symmetric/asymmetric rectangular voltage excitation, can solve the problems of lengthy sample preparation process and lack of physical meaning.

Pending Publication Date: 2020-11-10
CHINA THREE GORGES UNIV
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Problems solved by technology

The disadvantage of the Steinmetz empirical formula method and its modified formula is that it depends on the test. For a specific type of magnetic material, it is necessary to make a small magnetic ring of a specific size, measure the core loss density at different frequencies, and then obtain the undete

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  • Magnetic core high-frequency loss calculation method under symmetric/asymmetric rectangular voltage excitation
  • Magnetic core high-frequency loss calculation method under symmetric/asymmetric rectangular voltage excitation
  • Magnetic core high-frequency loss calculation method under symmetric/asymmetric rectangular voltage excitation

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Embodiment Construction

[0128] A method for calculating the high-frequency loss of a magnetic core under symmetrical / asymmetrical rectangular voltage excitation, comprising the following steps:

[0129] Step 1: Deduce the magnetization rate expressions of the ascending branch and descending branch of the trapezoidal and triangular magnetic flux density waveforms:

[0130] figure 1 It is a circuit topology of a bidirectional full-bridge DC-DC converter, which consists of a high-frequency transformer and a high-frequency H-bridge at both ends of the transformer. In the bidirectional full-bridge DC-DC converter, the excitation voltage of the winding port of the high-frequency transformer is not a sinusoidal voltage wave, but such as figure 2 The symmetrical rectangular voltage shown. The characteristic parameter of the symmetrical rectangular voltage is the duty cycle D 1 , the value range is 0~1. at a duty cycle of D 1 Under the rectangular voltage excitation of , the voltage value can be positi...

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Abstract

The invention discloses a method for calculating high-frequency loss of a magnetic core under symmetric/asymmetric rectangular voltage excitation, and the method comprises the steps: deducing ascending branch and descending branch magnetization rate expressions of corresponding trapezoidal and triangular magnetic flux density waveforms according to symmetric and asymmetric rectangular voltage excitation waveforms; calculating a static hysteresis loop and hysteresis loss of the thin strip-shaped soft magnetic material by adopting an Energitic static hysteresis model; deducing an eddy current loss correction coefficient according to the magnetization rate expressions of the ascending branch and the descending branch; deducing a residual loss correction coefficient according to the magnetization rate expression; and calculating a dynamic loss parameter according to the sine loss density of the thin strip-shaped magnet material in one magnetization period under different frequencies and different peak magnetic densities. Based on the derived expression, a calculation process of the thin strip-shaped soft magnetic material high-frequency loss calculation method is established. The method can be used for accurately calculating the magnetic core loss of the high-frequency transformer in the full-bridge DCDC converter and the inductor in the Boost type DCDC converter, and effectively separating the components of the magnetic core loss.

Description

technical field [0001] The invention belongs to the design field of high-frequency transformers and inductors, and in particular relates to a calculation method for high-frequency loss of a magnetic core under symmetrical / asymmetrical rectangular voltage excitation. Background technique [0002] High frequency and high power have become the current development trend of DC-DC converters. With the increase of operating frequency and power and the reduction of the volume of magnetic components, the problem of magnetic core loss becomes more and more obvious, which reduces the efficiency. Therefore, it is necessary to reduce the core loss of the magnetic element to improve the overall working efficiency of the DC-DC converter. At present, most of the low-power magnetic components in inverters and switching power supplies use ferrite as the core. Ferrite has high resistivity and low high-frequency eddy current loss, but its saturation magnetic density is low, and its working ma...

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Application Information

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IPC IPC(8): G06F30/20G06F30/367
CPCG06F30/20G06F30/367
Inventor 陈彬
Owner CHINA THREE GORGES UNIV
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