nifelheim skrev:Vill minnas att du måste ha någon speciell spänningsdelare till D+ och D- för att paddan eller ifånen ska "förstå" att den kan ladda med hög ström.
Stämmer, bäst att kolla upp vad som gäller för just den enhet man ska ladda.
http://en.wikipedia.org/wiki/Universal_ ... g_adapters
"harging ports exist in two flavors: charging downstream ports (CDP), supporting data transfers as well, and dedicated charging ports (DCP), without data support. A portable device can recognize the type of USB port from the way the D+ and D- pins are connected. For example,
on a dedicated charging port, the D+ and D- pins are shorted. With charging downstream ports, current passing through the thin ground wire may interfere with high-speed data signals. Therefore, current draw may not exceed 900 mA during high-speed data transfer. A dedicated charge port may have a rated current between 500 and 1500 mA. There is no upper limit for the rated current of a charging downstream port, as long as the connector can handle the current (standard USB 2.0 A-connectors are rated at 1500 mA).
Before the battery charging specification was defined, there was no standardized way for the portable device to inquire how much current was available.
For example, Apple's iPod and iPhone chargers indicate the available current by voltages on the D- and D+ lines. When D+ = D- = 2V, the device may pull up to 500 mA. When D+ = 2.0 V and D- = 2.8 V, the device may pull up to 1000 mA of current.[50]"
Det är alltså olika på äldre och nyare enheter.
De laddare du redan har kanske funkar fint i sig men inte är kompatibla med enheterna du vill ladda.
