Charging of Mobile
Nowadays mobile phones have become a part of our life. But the charging of mobile phone batteries has always been a major problem. Each mobile phone varies in their talk time and battery standby. Now the technology has improved a lot and new technologies are emerged to charge the mobile devices using wireless methods. Of these the most important one is charging mobile devices using microwaves. Do you know how this can be done?
The microwave signal is transmitted from the transmitter along with the message signal using special kind of antennas referred to as slotted wave guide antenna. This antenna is has a frequency of 2.45 GHz. Microwave technology is widely used in point-to-point telecommunications. They are used mostly because they can be more easily focused into narrow beams.
Wireless power transmission works on the principle of Magnetic induction. As we place one coil carrying current through it, it forms a magnetic field near to it. And if we place another coil over there than it’s induce by the primary coil and it carry current from it. This is often the principle of magnetic induction.
Wireless battery charging uses an inductive or magnetic field between 2 objects that are usually coils to transfer the energy from one to another. The energy will be transferred from the energy source to the receiver where it’s usually used to charge the battery in the device.
This makes wireless charging or inductive charging ideal to be used with several portable devices like mobile phones and other wireless applications. But they also found widespread use in products like electric toothbrushes where cordless operation is required. And where connections would be very unwise and temporary.
Several wireless charging standards are been developed or already exist in the market. Now let us have a look at these:
The Qi wireless charging standard is one that has come to the market before some others. It’s essentially what’s termed and inductive system using a comparatively low frequency (between 110 and 205 kHz for the low power and 80 to 300 kHz for the medium power) for the power transfer.
The A4WP wireless power standard was developed a bit later than the Qi standard. Usually, this uses resonance techniques along with a better power transfer frequency of 2.4GHz for the control signals and 6.78 MHz for the power. It also permits simultaneous charging of multiple devices.
Now let have a look at some of the advantages of using wireless mobile charging technique:
- Convenience: This system is more convenient as the appliance that has to be charged only needed to be placed in the charging field.
- Reduced wear of sockets and plugs: Since there is no physical connection, there is no problem with the connector issue.
- Resilience from dirt: Some appliance may usually operate in contaminated environments. As there are no connectors the system is free from contamination.
- Application in medical environments: Since this technology does not require any physical connection. It is free from bacteria. So this technology can be used in medical equipments that require battery power.