The future of residential building electrical installations

mapj1:

1 to 2 watts per socket is typical, and on some models  with a rather odd current waveform, as unloaded they go into a burst mode, where the switcher shuts off when the reservoir capacitor is above some voltage, and then restart at some lower value. Gives a very characteristic pulsed 'squegging' noise on the radio. And that is another disadvantage - meeting the bare minimum level for interference generation to meet CE marking is nothing like good enough if you wish to receive radio signals nearby. A plug in charger that causes interference can at least be unplugged.

There are different versions of USB sockets on the market and they are still being developed. Some can be switched off when not in use but others are permanently connected and they place a continuous parasitic load on the mains supply which is something that I find cause for concern. Has anybody investigated the impact of a continuous power drain on the network caused by USB sockets that are not being used - assuming that every home has an average of 10 of these sockets?


All SMPS place a strange load on the mains supply and are potential sources of EMI. I'm concerned that the small size and lack of shielding of USB sockets potentially exacerbates EMI.

mapj1:

1 to 2 watts per socket is typical, and on some models  with a rather odd current waveform, as unloaded they go into a burst mode, where the switcher shuts off when the reservoir capacitor is above some voltage, and then restart at some lower value. Gives a very characteristic pulsed 'squegging' noise on the radio. And that is another disadvantage - meeting the bare minimum level for interference generation to meet CE marking is nothing like good enough if you wish to receive radio signals nearby. A plug in charger that causes interference can at least be unplugged.

There are different versions of USB sockets on the market and they are still being developed. Some can be switched off when not in use but others are permanently connected and they place a continuous parasitic load on the mains supply which is something that I find cause for concern. Has anybody investigated the impact of a continuous power drain on the network caused by USB sockets that are not being used - assuming that every home has an average of 10 of these sockets?


All SMPS place a strange load on the mains supply and are potential sources of EMI. I'm concerned that the small size and lack of shielding of USB sockets potentially exacerbates EMI.