peterw;203280 Wrote: > I believe the EU already has efficiency rules for power supplies and EU > supplies typically have much better Power Factor profiles than US > supplies for that reason. According to Wikipedia, the EU regulation > only applies to switching supplies. As I understand it, efficiency > isn't just good "green" (lower energy demand) design, it's also better > for the power utilities' gear. Given the same actual power demand, the > utilities would rather have a larger more efficient device on the grid > than a smaller, less effcient one.
The EU doesn't place efficiency rules on power supplies (though the forthcoming Energy Using Products directive may change that). However, below is a quote from an application note by Condor Electronics (a major manufacturer of power supplies) - I believe the input harmonic requirement applies to units drawing 75W or more. ------------ Input Harmonic Reduction Although there are no regulations that specifically regulate the power factor of products, there are international regulations that limit the input harmonic content. In the European Union, the standard is EN61000-3-2, which took effect in 2001. It establishes limits on harmonics of the ac input current up to the 40th harmonic (2kHz). Limits are based on the input power, the type of product, and the specific harmonic. As stated earlier, low input harmonics are accomplished by making the input current a sine wave. Note: a product with a sinusoidal input current can still result in low power factor if the current is not in phase with the voltage. -- AndyC_772 ------------------------------------------------------------------------ AndyC_772's Profile: http://forums.slimdevices.com/member.php?userid=10472 View this thread: http://forums.slimdevices.com/showthread.php?t=35430 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
