Wireless Battery Charging is a battery recharge using an electromagnetic field to transfer energy between two objects through electromagnetic induction. This wireless charging technology was originally used to recharge batteries for relatively small mobile devices such as Smartphones and Smartphones. But today it has evolved into a technology that can recharge larger devices such as Car Batteries and other large devices.

This wireless charging or wireless charging usually uses an inductive clutch between two circuits to transfer power from one circuit to another and has no physical electrical contact so it is more convenient and also does not depend on connector contacts that can wear out after many charging cycles.

Wireless Battery Charging is usually flat or flat to facilitate the placement of devices to be recharged. In its application, wireless charging consists of two flat inductor reels whose primary side is connected to the power source while the secondary side is near the devices to be charged.

Some aspects of which affect how wireless battery charging works is the efficiency, diameter of the coil or coil and frequency used. The next aspect to note in the design of wireless charging is filtering and ensuring that wireless power transfer does not interfere with other electronic circuits, especially on power-receiving devices.

Wireless Charging Standard

There are several wireless charging standards that have been developed and can be found on the market. Among these standards are two of the most common standards found, namely Qi Wireless Charging Standard and A4WP Wireless Charging Standard.

1. Qi Wireless Charging Standard

The Qi Wireless Charging Standard was the first to be invented and has a fairly dominant market share. This standard has been adopted by the majority of phone manufacturers to recharge their phone batteries. Basically this Qi Wireless Charging Standard is an inductive system that uses relatively low frequencies (between 110 and 205 kHz for low power and 80 to 300 kHz for medium power) for power transfer.

2. A4WP Standard

The A4WP wireless power standard was developed slightly slower than the Qi standard. This A4WP standard uses resonance techniques along with a higher power transfer frequency of 6.78 MHz for power, and 2.4GHz for control signals. This A4WP standard also allows simultaneous charging for multiple devices.

Advantages and Disadvantages of Wireless Battery Charging

The following are some of the advantages and disadvantages of Wireless Battery Charging.

Advantages of Wireless Battery Charging:

• Convenience and Practical – Just put a device that requires charging to the charging area.
• Reduce wear on plugs and sockets – as there is no physical connection, no problems with connector wear and more. Physically the system is more powerful than the one that uses the connector.
• Impurities resistance – some applications operate in highly contaminated environments. Since there are no connectors, the system is much more resistant to contamination.
• More suitable for applications in medical environments – using wireless charging is not required connectors that can hold bacteria and others so it is safer to use on medical equipment that requires battery power.

Disadvantages of Wireless Battery Charging :

• Additional complexity – this system requires a more complex system to transfer power through a cordless interface.
• Additional costs – because these systems are more complicated than traditional wired systems, wireless chargers will be more expensive.
• Reduced efficiency – there are disadvantages to the wireless battery charging system such as resistivity losses on coils and others. But basically it can still be about 85 – 90% efficiency when compared to charging with cables.