Induction chargers consist of two primary induction coils. One is housed in the ‘charging base’ (commonly known as the ‘mat’) and is responsible for generating an alternating current (AC) from within the base. The other is in the portable device in need of a charge (like a smartphone, tablet etc.). The coil might be in the form of a pad that clips to your phone, a circuit embedded inside your phone, or a replacement battery cover with a built-in charging coil that gets connected to the charging socket. Together, these two coils make up an electrical transformer.
Mobile wireless chargning
When the power supply to the charging base/plate is switched on, AC flows through it and creates an electromagnetic field (a changing magnetic field) around the primary coil. When the secondary coil (the receiver coil, which is housed in the smartphone) comes in close proximity to the former, an electric current is generated within the coil. The AC flowing through the coil in the smartphone(wireless phone charger) is converted into DC (Direct Current) by the receiver circuit. The DC generated in this way could ultimately be used to wireless battery charger.
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