Wireless Charging – Behind the Curtain

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Mel Khamlichi
Webmaster and technical Director at Osradar.com Linux/Unix Guru Technology and hardware addicted Location : Amsterdam Netherlands

We all have heard about wireless charging, right? It’s just a magic – you place your phone on the charger and that’s it! No more hassle of the wired system. Some of the best smartphones – iPhone 8, iPhone 8 plus, iPhone X, Galaxy S7, S8 and Galaxy Note 8. A shadowy idea of its working method is familiar to us all. It’s not magic – it’s just a simple trick of physics and some awesome methods fused together.

First of all, let’s be clear – wireless charging isn’t that wireless. Of course, your charger needs to be connected to the power line via a wire. However, your phone + smart devices (only supported ones) will charge without any wired connection. Here’s how that works.

The basics

Wireless charging is nothing but a play of electromagnetic force. The charger uses magnetic induction to transfer energy to your phone. At first, you place your device on the charger and turn on the power. The electricity is using to create a waving magnetic force in a coil inside the charger. The device of yours has the same coil inside.

The changing magnetic force creates an induced electricity in the device’s coil. Using that power, the device charges its battery. It’s the same mechanism that’s used continuously into various important and crucial devices in our everyday life, for example, the transformers, calling bells etc.

Usage in smart devices

Although being very simple, it was never that simple to develop the tech, especially for the smart devices. Wireless charging has been with us for years. Even Nokia Lumia 820 from 2012 also contained wireless charging, not to mention the electronic toothbrushes and other gadgets. Although it seems awesome, such method isn’t much available for Android devices. If you’ve bought any recent iPhone, you’re able to use this facility.

Here’s a short list of wireless charging supported & famous devices.

• Samsung Galaxy – S6, S6 Edge, S7, S7 Edge, S8, S8+, Note 5, Note 8
• Microsoft Lumia – 920, 928, 929, 930, 1020, 1520
• Google Nexus – 4-7
• Blackberry – Priv
Interested in the long list? Just check it out!

Pros and cons

Wireless charging is awesome, no doubt. However, there are several pros & cons of it. Here, all of them are explained.

• Pros

o Looks awesome
o Connection protection – less risk of short circuit, no exposure to water + O2
o Low infection risk – safe to skin, no risk of getting scratched by wires
o Enhanced durability – no need for plugging & unplugging, less wear & tear of both the device socket and cables
o Multiple device support
o Simple to use – just put the phone on the charger and you’re free to go!

• Cons

o Slower charging – due to low energy efficiency, charges a lot slow
o More expensive – wireless charging isn’t mainstream yet, so costly hardware
o Usage inconvenience – the device must be moved gently while charging
o Compatibility issue – various devices need different types of wireless chargers
o Heating issue – in some cases, wireless charging heats up the charging device

If you’re a fan of wireless charging, give it a shot. It’s still not the best option. However, it will surely be an amazing experience. The all-new Qi standard of wireless charging is showing promise and has become the widespread standard for wireless charging.
Let’s go wireless and rule the world!

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