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Inductive charging pad for a smartphone as an example of near-field wireless transfer. When the phone is set on the pad, a coil in the pad creates a magnetic field [1] which induces a current in another coil, in the phone, charging its battery. Generic block diagram of a wireless power system
Contact-based accessories may include changeable backs for cellular phones, special sleeves, or attachable clips. The charging bases are designed to identify a compatible receiver and only power up when it's detected to avoid risk of electrocution. [2] Open Dots is a specification for such charging pads and receivers using contacts instead of ...
Applications of inductive charging can be divided into two broad categories: Low power and high power: Low power applications are generally supportive of small consumer electronic devices such as cell phones, handheld devices, some computers, and similar devices which normally charge at power levels below 100 watts.
Incompatibility of chargers for mobile phones is a major environmental problem and an inconvenience for users across the EU. Currently specific chargers are sold together with specific mobile phones. A user who wants to change his/her mobile phone must usually acquire a new charger and dispose the current one, even if this is in perfect condition.
Quick Charge is a proprietary technology that can charge battery-powered devices, primarily mobile phones, at power levels exceeding the 7.5 watts (5 volts at 1.5 amps) supported by the USB BC 1.2 standard, using existing USB cables. The higher voltage available allows more power (watts) to be supplied through wires without excessive heating.
Higher-power fast charge solutions for mobile devices rely on a charge pump instead of a buck converter to reduce the voltage, as higher efficiency reduces heat generation. The Samsung Galaxy S23, which takes an input current of 3 A, can charge its internal battery packs at 6 A thanks to a 2:1 current pump. [3]