Conducted EMI (electro-magnetic interference) noise suppression method of complex electronic system

An electronic system, noise suppression technology, applied in the direction of transmission noise suppression, transmission system, electrical components, etc., to achieve the effect of suppressing conducted EMI noise suppression methods

Active Publication Date: 2012-11-07
NANJING HUASHI ELECTRONICS SCI
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  • Abstract
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Problems solved by technology

[0004] Aiming at the conduction EMI noise problems caused by crosstalk, poor grounding and PCB cable impedance mismatch, it provides a conduction EMI noise suppression method for complex electronic systems that can effectively suppress the conduction EMI noise of complex electronic systems

Method used

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  • Conducted EMI (electro-magnetic interference) noise suppression method of complex electronic system
  • Conducted EMI (electro-magnetic interference) noise suppression method of complex electronic system
  • Conducted EMI (electro-magnetic interference) noise suppression method of complex electronic system

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Conducted EMI noise includes common-mode noise caused by high-frequency noise current between live wire and ground wire U CM , and the differential mode noise U DM . However, the rising edge of the switching device, poor grounding, RF field coupling between cables, and PCB cable impedance adaptation will all generate conducted EMI noise, which is the mechanism of conducted EMI noise generation.

[0029] ▲Generation mechanism of conducted EMI noise due to crosstalk

[0030] In a power system or communication system, the signal in the cable changes with time. According to Maxwell's equations, a radio frequency electromagnetic field will be generated around the cable, which will couple high-frequency noise to other cables, which is crosstalk. Generally speaking, the radio frequency electromagnetic field caused by the time-varying signal in the cabl...

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Abstract

A conducted EMI noise suppression method of a complex electronic system comprises: 1) analyzing the reasons generating the conducted EMI noise: (1) crosstalk, (2) bad grounding, and (3) PCB (printed circuit board) impedance mismatch; and 2) tightly winding the live wire and the neutral wire of a crosstalk choking coil in a negative-incoming negative-outgoing manner if the conducted EMI noise is caused by crosstalk; connecting capacitors (C1 to C8) in parallel, and respectively disposing U1 and U2 between C1 and C2, and between C4 and C5 if the conducted EMI noise is caused by bad grounding, wherein U1 is equal to U2, and the capacitances of C1, C2, C3, C4, C5, C6, C7 and C8 are respectively 22muF, 22muF, 0.1muF, 0.1muF, 0.1muF, 0.1muF, 100muF, and 10pF; and calculating the characteristic impedance of the PCB circuit by using electromagnetic simulation software, and carrying out signal integrity analysis according to the frequency characteristics of the transmission signal to realize the optimum impedance match of the PCB circuit if the conducted EMI noise is caused by PCB impedance mismatch.

Description

technical field [0001] The present invention relates to the suppression technology of conducted electromagnetic interference (EMI) noise generated by complex electronic systems, specifically for cable EMI noise generated by radio frequency electromagnetic The suppression technology of conducted EMI noise caused by cable impedance mismatch, etc. The application of this technology can better ensure that complex electronic systems pass the conducted EMI standard certification in electromagnetic compatibility technology, which belongs to the technical field of power electronics and electromagnetic compatibility (EMC). Background technique [0002] With the application of high-frequency switching devices, single-chip microcomputers, programmable logic devices, high-speed digital signal processing chips (DSP) and highly integrated PCB boards, the generation mechanism of electromagnetic interference noise in power electronic systems is more complex, and conducted electromagnetic int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B15/00
Inventor 张岳明陈爱林刘勇
Owner NANJING HUASHI ELECTRONICS SCI
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