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A PCB power loop EMI suppression circuit

A technology for suppressing circuits and power loops, applied in the direction of output power conversion devices, electrical components, high-efficiency power electronics conversion, etc., to achieve the effect of reducing ground plane impedance and PCB electromagnetic radiation

Active Publication Date: 2022-07-05
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are parasitic impedances in PCB traces and ground planes. Although these impedances are not shown in the schematic diagram, their influence on power supply noise and electromagnetic radiation interference is very obvious

Method used

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  • A PCB power loop EMI suppression circuit
  • A PCB power loop EMI suppression circuit
  • A PCB power loop EMI suppression circuit

Examples

Experimental program
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Effect test

Embodiment

[0029] see figure 1 , A PCB power loop EMI suppression circuit provided by this embodiment includes a power converter ground layer, and the power converter ground layer includes an input circuit and an output circuit connected in series with each other. Among them, one end of the input circuit is the power input terminal P InGND , for the input power line, the other end of the input circuit is the input node P 1 . One end of the output circuit is the power output terminal P OutGND , for the output power line, the other end of the output circuit is the output node P 3 . There is a first decoupling capacitor C in the input circuit i , there is a second decoupling capacitor C in the output circuit O , the decoupling capacitor can provide a more stable power supply, and can also reduce the noise coupled to the power supply end of the component, and indirectly reduce the influence of other components by the noise of this component. An inductor L is connected in parallel betw...

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PUM

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Abstract

The invention discloses a PCB power loop EMI suppression circuit, comprising a power converter ground layer, the power converter ground layer is provided with a power input end and a power output end, and the power converter ground layer includes a power converter connected in series The first parasitic impedance and the second parasitic impedance between the power supply input terminal and the power supply output terminal, a cross capacitor is connected in parallel on the ground layer of the power converter, and the two ends of the cross capacitor are respectively connected with the first parasitic impedance and A second parasitic impedance connection. The invention provides a PCB power loop EMI suppression circuit. By improving the circuit topology, a cross capacitor is added between the input and output nodes to reduce the impedance of the ground layer, thereby reducing the PCB electromagnetic radiation; at the same time, by improving the two ends of the cross capacitor Traces can further reduce PCB electromagnetic radiation; in addition, by improving PCB layout, the ground layer impedance can be further reduced, thereby reducing PCB electromagnetic radiation.

Description

technical field [0001] The invention relates to a technology for reducing radiated electromagnetic interference of a PCB power loop, in particular to a PCB power loop EMI suppression circuit. Background technique [0002] With the increasing frequency of various power products, signal integrity and power integrity problems are becoming more and more serious. The time it takes for product designers to address signal integrity is shrinking, products must be successful the first time when they are brought to market, and if there is interference from electromagnetic radiation during the product design cycle, the resulting product may have reduced life cycle and reliability. [0003] There are parasitic impedances in PCB traces and ground planes. Although these impedances are not represented in the schematic, their impact on power supply noise and electromagnetic radiation interference is very obvious. [0004] Ansys electromagnetic field simulation helps users design innovative...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/44
CPCH02M1/44Y02B70/10
Inventor 刘洋刘鑫张鹏
Owner HUAZHONG UNIV OF SCI & TECH