Filter for performing high-frequency suppression by using ferrite magnetic material

Abstract

The invnetion relates to a filter for performing high-frequency suppression by using a ferrite magnetic material. The filter comprises a null line and a live wire, wherein the null line and the live wire are respectively connected with two sides of a switch, the live wire is connected with a first terminal, the first terminal is connected with a first switch through a first resistor ESR and a first variable resistor ESL, the first terminal is connected with a second terminal, the second terminal is connected with a second switch through a second resistor ESR and a second variable resistor ESL, the second terminal is connected with a third terminal, the third terminal is connected with a diode and an ESD suppressor, and the ESD suppressor comprises a positive ESD protection module and a negative ESD protection module. According to the filter, the common-mode filter part and the ESD suppressor are connected and combined into a whole, so that the number of components can be reduced, the occupied area is reduced, high-frequency suppression protection performance on common-mode noise is achieved, an electrostatic suppression function is achieved, and damage of electrostatic discharge to important components is prevented.

Description

technical field [0001] The invention relates to the technical field of filters for high-frequency suppression by using ferrite magnetic materials, in particular to a filter for high-frequency suppression by using ferrite magnetic materials. Background technique [0002] The common-mode filter adopts ferrite core with double-wire parallel winding, low differential mode noise signal to suppress interference source, difficult to deform in high-speed signal, good noise suppression countermeasures, high common mode noise suppression and low differential mode noise signal suppression, common The design of the mode filter is relatively simple, including a common mode capacitor, an unbalanced transformer or a common mode inductor. The common mode capacitor bypasses the common mode current of the two input lines to the ground, and the common mode inductor presents a balanced impedance, that is, The impedance between the power line and the ground line is equal, and this impedance pres...

AI Technical Summary

Problems solved by technology

[0004] (1) The existing common-mode filter and electrostatic suppressor are two separate independent components, with a large number of components and a large installation area, and because the components are getting smaller and smaller, they are easily affected by static electricity. The filter lacks the performance of high frequency suppression and protection

[0005] (2) Existing common-mode filters are widely used, but the effect is poor in terms of magnetic permeability, the initial magnetic permeability is low, and the overall magnetic induction intensity is low, which leads to poor overall effect, poor use effect, and high Common mode noise suppression and low differential mode noise signal suppression take a long time, which is not convenient for users to use;

[0006] (3) The conduction current of the ESD circuit is relatively large when the grid and source of the P-type GAN enhanced power device 30 have a reverse voltage bias, causing the ESD circuit to be inconsistent with the grid negative voltage test for detecting grid-related defects. compatible, making it difficult for the device to balance reliability and ESD tolerance

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