how to get Wireless charging methods of different cell phones - 3

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There are three methods of charging. They are as follows

1. Inductive charging

2. Radio charging

3. Resonance charging

1.1  Inductive Charging:

Inductive charging is used for charging mid-sized items such as cell phones, MP3 players and PDAs. Inductive charging uses the electromagnetic field to transfer energy between two objects. A charging station sends energy through inductive coupling to an electrical device, which stores the energy in the batteries. Because there is a small gap between the two coils, inductive charging is one kind of short-distance wireless energy transfer.

In inductive charging, an adapter equipped with contact points is attached to the device's back plate. When the device requires a charge, it is placed on a conductive charging pad, which is plugged into a socket

Advantages:

·        Inductive charging carries a far lower risk of electrical shock.

·        Inductive charging is used for implanted medical devices that require periodic or even constant external power, and for electric hygiene devices, such as toothbrushes and shavers, that are frequently used near or even in water.

·        Inductive charging makes charging mobile devices more convenient.

Disadvantages:

·        One disadvantage of inductive charging is its lower efficiency and increased ohmic (resistive) heating in comparison to direct contact.

·        Inductive charging also requires drive electronics and coils that increase manufacturing complexity and cost

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1.2  Resonance Charging:

Resonance charging is used for items that require large amounts of power, such as an electric car, robot, vacuum cleaner or laptop computer. In resonance charging, a copper coil attached to a power source is the sending unit. Another coil, attached to the device to be charged, is the receiver. Both coils are tuned to the same electromagnetic frequency, which makes it possible for energy to be transferred from one to the other. The method works over short distances (3-5 meters).

1.3  Radio Charging:

Radio charging is used for charging items with small batteries and low power requirements, such as watches, hearing aids, medical implants, cell phones, MP3 players and wireless keyboard and mice. Radio waves are already in use to transmit and receive cellular telephone, television, radio and Wi-Fi signals. Wireless radio charging works similarly. A transmitter, plugged into a socket, generates radio waves. When the receiver attached to the device is set to the same frequency as the transmitter, it will charge the device's battery.