High-power filtering protection device and frame-type filtering structure

Abstract

The invention discloses a high-power filtering protection device and a frame-type filtering structure. The high-power filtering protection device comprises a preceding-stage filtering circuit and a backward-stage protection circuit, and the protection circuit comprises NMOS tubes Q1 and Q2 and a control chip U1. The drain electrode of the Q1 is connected with the positive electrode of the input end, the grid electrode of the Q1 is connected to the HGATE end of the U1 through the R4, and the source electrode of the Q1 and the source electrode of the Q2 are connected to the SOURCE end of the U1;the grid electrode of the Q2 is connected to the DGATE end of the U1, and the drain electrode of the Q2 is connected to the SENSE end of the U1; the SOURCE end of the U1 is connected with the positive electrode of the D1 and the positive electrode of the D2, and the negative electrode of the D1 and the negative electrode of the D2 are connected to the HGATE end and the DGATE end of the U1 respectively. The SENSE end of the U1 is connected to the OUT end through the R5, the UV end of the U1 is connected with the positive electrode of the input end through the R1, the OV end is connected with the negative electrode of the output end through the R3, and the UV end is connected to the OV end through the R2; the FB end of the U1 is grounded through the R6 and is connected to the OUT end through the R7, the GND end of the U1 is connected with the negative electrode of the output end, and the TMR end is connected to the negative electrode of the output end through the capacitor C7. Accordingto the present inventio, the requirement for circuit safety protection can be met, and the electromagnetic compatibility of device is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a high-power filter protection device and a frame filter structure. Background technique [0002] During the working process of the automotive electrical system, when the load current, voltage and magnetic field in the equipment change, it is easy to generate high-frequency interference signals, and these high-frequency interference signals are easily transmitted through the power line, which is harmful to back-end equipment such as communication radar. Large interference will cause adverse effects on the performance of the vehicle equipment. In addition, when the power supply is switched and fluctuates, it is prone to surge voltage, overcurrent, overvoltage and undervoltage, etc., which may cause damage to the back-end equipment. Contents of the invention [0003] Aiming at the deficiencies in the prior art, the present invention provides a high-power ...

AI Technical Summary

Problems solved by technology

[0002] During the working process of the automotive electrical system, when the load current, voltage and magnetic field in the equipment change, it is easy to generate high-frequency interference signals, and these high-frequency interference signals are easily transmitted through the power line, which is harmful to back-end equipment such as communication radar. Cause greater interference, which will adversely affect the performance of on-board equipment

In addition, when the power supply is switched and fluctuates, it is prone to surge voltage, overcurrent, overvoltage and undervoltage, etc., which may cause damage to the back-end equipment

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