RF Wireless Charging

Posted | Apple trends

Wireless charging technology has already existed since 19/20th century

Wireless charging is a term that has become widespread for a long time. I myself, who is not enthusiastic about technology, have heard about it. But I couldn’t imagine, what does this term really mean, although, the term wireless charging is almost settled in daily life. Many people have already an electric toothbrush and bring wireless charging into their bathroom – and this is just an example. Now, wireless charging shall also capture the Smartphone front. While thinking about that, it becomes really attractive. No cable spaghetti, apart from different chargers and charging where you want. Due to the glasses backside, Apple offers its iPhone 8/Plus, X users a chance to charge the iPhone by induction. This is supported by Apple’s project of Qi. Qi is a market leader of wireless charging. I myself, found also another opportunity if wireless charging: RF wireless charging (radio frequency). Can this be a competitor to the market leader?

Induction or radio waves…

While both companies promote for wireless charging, they are using different technologies. There are actually two systems with a transmitter (charge station) and receiver (mobile phone), but these are the only common features between both companies. While Qi has an inductive interconnection between transmitter and receiver, companies as Humavox are using radio waves. While there is an electromagnetic field with induction, RF waves are transmitting to the receiver with RF wireless charging, where arrived energy is changed into DC voltage.

…what is better?

During a charge with induction, there is a clear limited factor of power: The coils. Those, who have paid enough attention in physics, will have any problem with the fact, that form and size are important factors for the efficiency of coils. Je larger the coils, the larger the electromagnetic field as well. But this is the crux. Only large and flat devices are suitable for coils. So there are no problems in the Smartphone world, but some difficulties can arise with other devices (such as hearing aids). And this is where RF wireless charging stepped in. Due to its autonomy from coils and other large sized factors, this technology can be effective in many areas.

Though the induction charging is fully functional for Smartphones, it can cause some disadvantage. Transmitter and receiver have to be pressed together. This means, that the mobile phone has always to be pressed exactly to charge station. This is recommended by the manufactures. You can find some tips and tricks about this issue on the website of Apple. Even a vibration of message can move the Smartphone away, which leads to a charge break. In my opinion, I suggest, that this is a little bit annoying to switch off the vibration or select flight mode. These are tips, which can take away the fun of wireless charging.

RF wireless charging whereas does not have these kinds of problems. You can differentiate between following types:

  1. Far-Field RF wireless charging

With Far-Field RF wireless charging, the device has not to be pressed on a panel. In the near of this type is quite enough. Radio waves are emitted in area. When the Smartphone will be located in close to Far-Field RF wireless charging, the mobile phone will be charged. The high loss of energy and the resulting fall in charge efficiency are the disadvantages.

  1. Near-Field RF wireless charging

Humavox is the only company, which offers this version. The term “drop & charge” can be take in the literal sense. The charge station is defined as a key, box etc. While the receiver has to be pressed on transmitter by an induction charging, we can “drop” the receiver in a bowl in this case without any problems concerning the charge. It doesn’t matter, which position it has.

RF wireless charging – In my opinion, it is more future-oriented

Charging per induction is available for longer than RF wireless charging. This is why, Qi is more known than Humavox. Qi offers its products on market for a long time. This is a reason, why this company has the opportunity to improve and test other future versions. Humavox is comparably new on market with its RF wireless charging. Where induction charging is restricted by limitations, RF wireless charging is coming into play. Charging per radio waves is also a good opinion for other situations. For example, the elderly don’t need to be annoyed by cables and plugs. They can drop their hearing aid immediately into the bowl and let it charge. RF wireless charging offers a better opportunity than a charging with induction, not only with charging Smartphone, but in technical areas as well. It will be very interesting, if RF wireless charging can be settled as the same as the market leader.


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