What ever advancement Cellphone achieves, Wireless Charging is future. With Wireless charging, step by step method of how it works in Cellphone is explained.

Wireless charging offers us a safe, convenient and efficient way for powering up as well as charging our electrical equipment/gadgets at a small scale (like home) and at a bigger scale, too ( like workshops and industrial level). Many of our house-hold gadgets are based on it and we are using this technology from decades.

Fig. 1 – Wireless Charging Coil

The term ‘Wireless charging’ is quite old now. However, Only a few Cell phones are coming with it pre-equipped. And that too with high cost implications. Here we will try to understand the concept behind it. Later on we will also figure out how to make our normal cell phones ready for charging wirelessly. But first things first. Lets understand its basic concept:

## Principle of Wireless Charging

Fig. 2 – Electro-magnetic Induction

Wireless charging functions on the Electromagnetic induction principle. That means, it uses electro-magnetic fields to transmit power from a transmitting device to a receiving device.

The power received by the Receiver is further used to charge the battery of a device.  It is just like how a transformer functions.  To understand the complete charging process in a better way, Lets split it in various steps.

## How Wireless Charging Works – Step by Step

Fig. 3 – How wireless charging works

### Step 1

Applied power (voltage) is first converted into HFAC (High-frequency alternating current).

### Step 2

The HFAC is then supplied to the Transmitter coil through Transmitter circuitry.  The HFAC flowing through the coil generates a magnetic field in the transmitter coil.

### Step 3

The Transmitter coil’s magnetic field passes through the Receiver coil of the device to be charged.

### Step 4

This varying magnetic field in the Receiver coil produces a flow of current through it.

### Step 5

This current flowing through the Receiver coil is then converted into Direct current (DC) by the Receiver circuitry which is further used for charging the battery of the device be charged.

## History of Wireless Charging

Fig. 4 – History of Wireless Charging

I hope, you have got some basic idea about the working of wireless charging now. In our next post, we will try to understand :

`Advantages of Wireless Charging`
`Disadvantages of Wireless Charging`