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Gizmo

发布时间:2019-03-01 03:12:03来源:未知点击:

Cellphones often run out of power when you are on the move. So Nokia has filed a patent application on a portable charger for a new type of cellphone (US 2007/0024238). The device contains a pre-charged battery and an induction coil, while the phone also has an induction coil. When an RFID reader in the charger picks up a signal from the phone, it switches on a current in the coil. This induces a current in the phone’s coil,