Aspire Switch 10 USB Charger possible?
12 volt and 1,5 amps to charge [...]
   any USB port 


12 Volt and 1.5 A means 18 W. To get 18 W from the 5 Volts of the USB port you need at least 3.6 A current - but normal USB will deliver only 0.5A or 1.5 to 2.1A on a specialized charging port. That is simply not enough power.