Systematic investigation and reduction of radiated emission from LCD monitor
This project investigates the feasibility of retrofitting commercial off-the-shelf liquid crystal display (LCD) monitors to meet more stringent radiated emission requirements, such as military electromagnetic compatibility (EMC) standards. For reciprocity theorem, a LCD monitor with low rad...
| 1. autor: | |
|---|---|
| Kolejni autorzy: | |
| Format: | Praca dyplomowa |
| Język: | English |
| Wydane: |
2013
|
| Hasła przedmiotowe: | |
| Dostęp online: | http://hdl.handle.net/10356/54907 |
| _version_ | 1826115447867572224 |
|---|---|
| author | Soh, Weishan. |
| author2 | See Kye Yak |
| author_facet | See Kye Yak Soh, Weishan. |
| author_sort | Soh, Weishan. |
| collection | NTU |
| description | This project investigates the feasibility of retrofitting commercial off-the-shelf liquid
crystal display (LCD) monitors to meet more stringent radiated emission
requirements, such as military electromagnetic compatibility (EMC) standards. For
reciprocity theorem, a LCD monitor with low radiated emission also exhibits good
electromagnetic immunity. Hence, the modified LCD monitors are rugged enough
for a more hostile electromagnetic environment and also not causing interference to
other nearby systems.
The project begins with a review of the basic operating principle of a LCD monitor
display and common electromagnetic interference (EMI) suppression techniques.
Preliminary radiated emission profiles of the various circuit modules are measured
and analysed. The EMI filter has been found to play an important role in controlling
radiated emissions. Hence, the EMI filter design is carefully studied and analysed to
reduce the radiated emission levels from the LCD monitor.
Finally, the radiated emissions of original LCD monitor and the retrofitted LCD
monitor are measured in accordance with MIL-STD-461E to demonstrate the
effectiveness of the EMI suppression techniques implemented. By properly
designing the EMI filter on the power card of the original LCD monitor, the radiated
emission from the LCD monitor can be reduced by 10 to 20 dB from 2 MHz to 1
GHz. |
| first_indexed | 2024-10-01T03:55:39Z |
| format | Thesis |
| id | ntu-10356/54907 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:55:39Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/549072023-07-04T15:01:17Z Systematic investigation and reduction of radiated emission from LCD monitor Soh, Weishan. See Kye Yak School of Electrical and Electronic Engineering DRNTU::Engineering This project investigates the feasibility of retrofitting commercial off-the-shelf liquid crystal display (LCD) monitors to meet more stringent radiated emission requirements, such as military electromagnetic compatibility (EMC) standards. For reciprocity theorem, a LCD monitor with low radiated emission also exhibits good electromagnetic immunity. Hence, the modified LCD monitors are rugged enough for a more hostile electromagnetic environment and also not causing interference to other nearby systems. The project begins with a review of the basic operating principle of a LCD monitor display and common electromagnetic interference (EMI) suppression techniques. Preliminary radiated emission profiles of the various circuit modules are measured and analysed. The EMI filter has been found to play an important role in controlling radiated emissions. Hence, the EMI filter design is carefully studied and analysed to reduce the radiated emission levels from the LCD monitor. Finally, the radiated emissions of original LCD monitor and the retrofitted LCD monitor are measured in accordance with MIL-STD-461E to demonstrate the effectiveness of the EMI suppression techniques implemented. By properly designing the EMI filter on the power card of the original LCD monitor, the radiated emission from the LCD monitor can be reduced by 10 to 20 dB from 2 MHz to 1 GHz. Master of Science (Electronics) 2013-10-24T08:32:07Z 2013-10-24T08:32:07Z 2013 2013 Thesis http://hdl.handle.net/10356/54907 en 72 p. application/pdf |
| spellingShingle | DRNTU::Engineering Soh, Weishan. Systematic investigation and reduction of radiated emission from LCD monitor |
| title | Systematic investigation and reduction of radiated emission from LCD monitor |
| title_full | Systematic investigation and reduction of radiated emission from LCD monitor |
| title_fullStr | Systematic investigation and reduction of radiated emission from LCD monitor |
| title_full_unstemmed | Systematic investigation and reduction of radiated emission from LCD monitor |
| title_short | Systematic investigation and reduction of radiated emission from LCD monitor |
| title_sort | systematic investigation and reduction of radiated emission from lcd monitor |
| topic | DRNTU::Engineering |
| url | http://hdl.handle.net/10356/54907 |
| work_keys_str_mv | AT sohweishan systematicinvestigationandreductionofradiatedemissionfromlcdmonitor |