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Measurement method of broadband relative permeability of soft ferrite core with integrated inductor

A technology of relative magnetic permeability and soft ferrite, applied in the direction of magnetic performance measurement, etc., can solve the problems of complex operation and poor stability, and achieve the effect of simple operation, avoiding randomness and high repeatability

Inactive Publication Date: 2017-11-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of complex operation and poor stability of the existing broadband relative permeability measurement method. The present invention provides a measurement method for the broadband relative permeability of a soft ferrite core with an integrated inductor

Method used

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  • Measurement method of broadband relative permeability of soft ferrite core with integrated inductor
  • Measurement method of broadband relative permeability of soft ferrite core with integrated inductor
  • Measurement method of broadband relative permeability of soft ferrite core with integrated inductor

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specific Embodiment approach 1

[0037] Specific implementation mode one: combine figure 1 Describe this embodiment, the method for measuring the broadband relative magnetic permeability of the soft ferrite core integrated with the inductor described in this embodiment, the measurement method is realized based on a measurement platform, and the measurement platform includes a radio frequency coaxial connector 2. RF coaxial cable 3 and network analyzer 4;

[0038] The integrated inductor 1 to be tested includes a soft ferrite core and a printed circuit board (PCB),

[0039] The plate-type printed circuit is a single-sided spray-plated winding copper conductor, hollowed out in the middle, and nested in a ferrite core. The output end of the integrated inductor 1 is connected to a connection end of the RF coaxial connector 2, and the RF coaxial The other connection end of the connector 2 is connected to the network analyzer 4 through the radio frequency coaxial transfer line 3;

[0040] The measurement methods ...

specific Embodiment approach 2

[0075] Embodiment 2: This embodiment is a further limitation of the method for measuring the broadband relative magnetic permeability of the soft ferrite core of the integrated inductor described in Embodiment 1.

[0076] The method also includes:

[0077] Step 8: Replace the board-type printed circuit of the integrated inductor 1, use steps 1 to 7 to measure, obtain the broadband relative magnetic permeability of the soft ferrite core after replacing the board-type printed circuit, and use the replacement board to print The broadband relative magnetic permeability obtained after the circuit and the broadband relative magnetic permeability obtained in step 7 are averaged, and the averaged broadband relative magnetic permeability is the broadband relative magnetic permeability of the integrated inductor (1) to be tested;

[0078] The replacement of the board-type printed circuit of the integrated inductor 1 includes: replacing the same type of board-type printed circuit, replac...

specific Embodiment approach 3

[0080] Embodiment 3: This embodiment is a further limitation of the method for measuring the broadband relative magnetic permeability of the soft ferrite core of the integrated inductor described in Embodiment 2,

[0081] When considering the air gap of the integrated inductor, the broadband relative permeability μ e Further optimization is required, and the optimized broadband relative permeability is:

[0082]

[0083] In the formula, l g is the air gap of the integrated inductor.

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Abstract

The invention provides an integrated inductor soft magnetic ferrite magnetic core broadband relative permeability measuring method, belongs to the field of electromagnetic measurement, and aims at solving problems that existing broadband relative permeability measuring methods are complex in operation and poor in stability. An integrated inductor comprises a soft magnetic ferrite magnetic core and a board type printed circuit. An equivalent circuit model and a no-load equivalent circuit model of the integrated inductor are respectively established in the method, and the equivalent inductance frequency characteristic of the integrated inductor is calculated through combination of the corresponding impedance characteristic. The parameters in the models are acquired by utilizing a geometric dimension measuring method so that broadband relative permeability of the soft magnetic ferrite magnetic core is further obtained. The method is suitable for measurement of soft magnetic ferrite broadband relative permeability of the integrated inductor.

Description

technical field [0001] The invention belongs to the field of electromagnetic measurement. Background technique [0002] With the development of semiconductor devices and the improvement of circuit topology, the operating frequency of power electronic converters has been continuously increased. However, the existence of electromagnetic interference (EMI) limits the further improvement of operating efficiency. In the frequency range where power electronic equipment works, its electromagnetic interference is mainly conducted interference (0.15 ~ 30MHz), and the most effective measure to suppress conducted interference is to install an EMI filter. In order to accurately predict the insertion loss in the filter design stage and to design a more effective inductor, it is necessary to grasp the high-frequency characteristics of the soft ferrite core. One of the important electromagnetic parameters is the relative permeability of the core. Although there are many magnetic materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/12
Inventor 张刚刘璇白瑾珺康代涛王立欣
Owner HARBIN INST OF TECH