Circuit design for broad band EMI reduction in LCD driver IC

Kim, Soo-Woo; An, Se-Hyuk; Kim, Namsoo; Jeong, Hyeim; Choi, Ho Cheol

doi:10.1109/norchip.2014.7004699

Cited by 1 publication

(1 citation statement)

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“…This fault was resolved by improving the BTM's immunity as described in [5], and further research on the BTM's electromagnetic sensitivity is presented in [6]. Reference [7,8] proposed optimizing wiring and applying cascode level shifter to solve EMI problems related to abnormal LCD displays in the passenger information system. However, there is a lack of research on the EMC of train PWM encoders.…”

Section: Introductionmentioning

confidence: 99%

Investigation and Analysis of Electromagnetic Interference for PWM Encoder of Urban Rail Train

Yang,

Zhu,

Wang

et al. 2023

ACES Journal

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Electromagnetic compatibility (EMC) is an important factor in ensuring the safe operation of the sensitive electronic equipment on urban rail trains. The pulse width modulation (PWM) encoder of an urban rail train exported from China to Brazil is sometimes affected by electromagnetic interference (EMI), which causes the train to fail to run properly. To solve this problem, the EMC test is performed on the PWM encoder to identify the coupling path and the type of interference source. The EMI coupling model and the vehicle-catenary-rail model are established by using an electromagnetic transients program (EMTP) to analyze the mechanism of interference coupling. It is shown that the unbalanced voltage of the train body caused by the backflow of the grounding current is the root cause of the interference of the PWM encoder. The maximum voltage coupled to the internal port of the PWM encoder is about 1894 V, which is sufficient to burn out the encoder. A measure to suppress the interference by installing thyristor surge suppressors (TSS) P0300SC is proposed, which effectively solves the EMI problem of the PWM encoder.

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Section: Introductionmentioning

confidence: 99%