Chip Level Techniques for EMI Reduction in LCD Panels

Kim, Min-woo; Kim, Do-wan; Koo, Bon-sung; Kim, Yong-bum; Choi, On-Sik; Kim, Nam-deog

doi:10.1109/emczur.2009.4783485

Cited by 8 publications

(5 citation statements)

References 6 publications

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“…In the same framework, many researches aim at the application of spread-spectrum modulation (SSM) techniques on power converters as a suitable method of EMI mitigation, as SSM spreads EMI power into a wider band of frequencies so as to significantly reduce the EMI amplitude at the harmonics of the switching frequency [16][17][18]. Indeed, SSM has been found to be effective to keep the electromagnetic emission levels below EMC standard limits and has been used in some applications like electronic ballasts [19] and LCD panels [20,21]. However, some research was conducted to determine the effect of the SSM on telecommunication devices, especially in the range 2 to 150 kHz [22].…”

Section: Introductionmentioning

confidence: 99%

The Effect of EMI Generated from Spread-Spectrum-Modulated SiC-Based Buck Converter on the G3-PLC Channel

et al. 2021

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Power line communication (PLC) is increasingly emerging as an important communication technology for the smart-grid environment. As PLC systems use the existing infrastructure, they are always exposed to conducted electromagnetic interference (EMI) from switching mode power converters, which need to be tightly controlled to meet EMC regulations and to ensure the proper operation of the PLC system. For this purpose, spread-spectrum modulation (SSM) techniques are widely adopted to decrease the amplitude of the generated EMI from the power converters so as to comply with EMC regulations. In this paper, the influence of a spread-spectrum-modulated SiC-based buck converter on the G3-PLC channel performance is described in terms of channel capacity reduction using the Shannon–Hartley equation. The experimental setup was implemented to emulate a specific coupling path between the power and communication circuits and the channel capacity reduction was evaluated by the Shannon–Hartley equation in several operating scenarios and compared with the measured frame error rate. Based on the obtained results, SSM provides the EMI spectral peak amplitude reduction required to pass the electromagnetic compatibility (EMC) tests, but results in increased EMI-induced channel capacity degradation and increased transmission error rate in PLC systems.

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Section: Introductionmentioning

confidence: 99%

The Effect of EMI Generated from Spread-Spectrum-Modulated SiC-Based Buck Converter on the G3-PLC Channel

et al. 2021

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“…In recent years spread spectrum techniques have been used in many applications, ranging from class D amplifiers [25]- [28] to microprocessor clock generators [29], [30], electronic ballasts [31], and LCD display panels [32]. It has been also adopted in some recent communication protocols like Serial ATA [33]- [39], Display Port [40] and PCI Express [41].…”

Section: Introductionmentioning

confidence: 99%

EMI Reduction via Spread Spectrum in DC/DC Converters: State of the Art, Optimization, and Tradeoffs

2015

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Spread spectrum is a technique introduced for mitigating electromagnetic interference (EMI) problems in many class of circuits. In this paper, with particular emphasis on switching DC/DC converters, we consider the most common and most efficient known spreading techniques, looking for spreading parameters that ensure the highest EMI reduction and the lowest performance reduction in the circuit where the spreading is applied. The result is an interesting tradeoff not only between EMI reduction and performance drop, but also on the EMI reduction itself when considering different EMI victim models. The proposed analysis is supported by measurements on two switching DC/DC converters: 1) based on pulse-width modulation and 2) based on the resonant converter class

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“…4. According to experimental data in [21], most EMI noise sources of TFT-LCD panel come from the T-CON and occur at the clock harmonic frequencies. Fig.…”

Section: Radiated Emission Problem In a Tft-lcd Panelmentioning

confidence: 99%

Estimating the Reduction of Radiated Emissions From TFT-LCD Panel Using Network Analyzer With a Bulk Current Injection Probe

Ho¹,

Chen²,

Horng³

et al. 2013

PIER

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Abstract-A network analyzer with a bulk current injection (BCI) probe is proposed to measure the common-mode conversion coefficient for DC supply loops on a driver PCB of thin film transistor-liquid crystal display (TFT-LCD) panel. The proposed technique is used to predict the common-mode radiated emission caused by the DC supply loops, which highly correlates with the radiated emission measurements obtained for the TFT-LCD panel in a fully anechoic chamber (FAC). The proposed technique is also successful to estimate the reduction of a specific peak in the radiated emission spectrum by shielding the DC supply loops on a driver PCB of TFT-LCD panel. Electromagnetic simulation and equivalent-circuit modeling approaches are developed to confirm the common-mode radiation mechanism in this study.

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Chip Level Techniques for EMI Reduction in LCD Panels

Cited by 8 publications

References 6 publications

The Effect of EMI Generated from Spread-Spectrum-Modulated SiC-Based Buck Converter on the G3-PLC Channel

The Effect of EMI Generated from Spread-Spectrum-Modulated SiC-Based Buck Converter on the G3-PLC Channel

EMI Reduction via Spread Spectrum in DC/DC Converters: State of the Art, Optimization, and Tradeoffs

Estimating the Reduction of Radiated Emissions From TFT-LCD Panel Using Network Analyzer With a Bulk Current Injection Probe

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