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2. Disturbances generated by multimedia devices
2.1 Analysis of power supply operation and disturbances
The multimedia devices studied are :
a 45 W television set;
DVD player ;
a computer ;
an ADSL modem.
All these devices have built-in power supplies, except for the ADSL modem, which is powered by a switch-mode AC adapter. Today, these converters are increasingly replacing mains adapters that used to be powered by a 50 Hz transformer. The current measured can be used to identify the type of conversion used in device power supplies. Most devices below 75 W use diode rectification combined with capacitive filtering to convert AC mains voltage into DC...
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Bibliography
Standards and norms
- ISO Acoustique : méthode de calcul du niveau d'isotonie - ISO 532 - 1975
- Limits for harmonic current emissions (current drawn by devices) per phase, p. 15 § 7, UTE - NF EN 61000-3-2 - 05-01
- Limites et méthodes de mesure des perturbations radioélectriques produites par les appareils électriques d'éclairage et les appareils analogues, p. 10, § 5.3.4, UTE - NF EN 55015 - 05-01
- Electromagnetic compatibility...
Regulations
Directive 2005/32/EC (6 july 2005) of the European Parlement and of the council – Establishing a framework for the setting of ecodesign requirements for energy-using products and amending Council Directive 92/42/EEC and Directives 96/57/EC and 2000/55/EC of the European Parlement and the Council.
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