how to get Wireless charging methods of different cell phones - 4 DIAGRAM

BLOCK DIAGRAM OF CHARGING

WORKING OF BLOCK DIAGRAM:

Transmitter:
The most basic transmitter setup consists of a piece of equipment that generates a signal whose output is then fed into an amplifier that is finally output through a radiating antenna – the air interface. A condition must be met where the antenna operates optimally at the desired frequency output from the signal generator. In the current case, an antenna was connected through an amplifier to a radio-frequency (RF) source. The RF source is a circuit that outputs a signal at a user- specified frequency and voltage. The range of frequencies of the signal generator resides in the radio frequency band, 3 mega-hertz (MHz) to 3 giga-hertz (GHz). The output power of this device is limited. For this reason, an amplifier is required on the output.
The transmitting antenna is called a patch antenna and is fabricated from copper plating that is soldered to a feed wire and has a ground plane. The frequency of 915MHz was chosen for this project because it is one at which our team has experience, and it falls in one of the Industrial-Scientific-Medical (ISM) RF bands made available by the Federal Communications Commission for low power, short distance experimentation.
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This frequency was chosen mostly for simplicity in using the available equipment. It is not used for mass communication or anything else on a major scale, and therefore is not going to be interfered with, or interfere with other devices at low power levels. This also means that transmitters for short distances are readily available. In fact, 915MHz is a very common frequency used in RF research. This makes a transmitter system easy to construct and manage. The source is nothing more than a signal generator, capable of outputting a low-noise AC signal at 915MHz. This setup results in the antenna beaming approximately 6mW of power per square meter. This was the limit of the gain of the amplifier.
Receiver:
The receiver’s main purpose is to charge a battery. A simple battery charging theory is to run current through the battery, and apply a voltage difference between the terminals of the battery to reverse the chemical process. By doing so, it recharges the battery. There are other efficient and faster ways to charge the battery, but it requires a large amount of energy which the wireless battery charger cannot obtain, yet. Therefore, in our design, we use a straight forward method to charge the battery.
Microwave signal is an AC signal with a frequency range of 1 GHz – 1000 GHz. 915 MHz is in between the RF/ Microwave range. No matter how high the frequency is, AC signal is still AC signal. Therefore, the signal can also be treated as a low frequency AC signal. In order to get a DC signal out of the AC signal, a rectifier circuit is needed. At the output of the rectifier, the signal is not a fully DC signal yet. Thus, by adding a capacitor and a resistor can smooth out the output to become DC signal.