Inductive Charging

Wireless Charging

        Charging has become very important in life. Any mobile device needs power(electric power)to run. In the early 2000s the usage of electronics is less so that with less battery we were able to survive weeks but in the current world, every gadget needs a lot more power to provide an efficient usage, nowadays even with a large amount of battery capacity we are only able to withstand a day. It clearly explains our dependence on electronics.

Okay! Let’s get into the topic.

    Searching for a charger and plugging in is the most frustrating one for most youngsters. So the digital world has taken a step in solving this issue by making an inductive charger and in layman terms wireless charger.

How do they work


 Its working principle is so basic. It makes use of electromagnetic induction (Faraday’s law). The inductive charging has a charging platform: which comprises a primary coil on the charger and a secondary coil circuit which is found in the device to be charged. 

    Once the alternating current flows through the primary coil it generates an alternating magnetic field in the primary and hence due to electromagnetic induction the current is induced in the secondary coil. 

Wireless charger details

    The fluctuating current(AC) is then changed into linear current(rectified) by small circuital elements(rectifier circuit) which are required for charging the electronic devices(almost all electronic devices need DC power to work).

    This is not a new technology. This has been used in the late ’80s to demonstrate charging vehicles but at that time diesel engines were more popular so this approach went forgotten.

What are their types?

        These types of chargers are now extensively used in charging the electric razors and electric cigarettes and now it stepped into mobile chargers as we know most of the smartphone comes with Inductive charging nowadays.

    This is of two types inductive charging and resonant charging

  •     Inductive charging is the basic and most used one that was explained before. 
  •     Resonance charging is the upgraded version of inductive charging. In this type, there are many resonant circuits between the charging platform and the devices. The advantage over inductive charging is that it can charge many devices at a time, the device can be of any position and can be within certain distance limits. 

    With this much application the negative points of resonant charging is that it is more complex and more expensive. 

Resonance charging

Three competing wireless charging standards focus on inductive and resonance charging specifications: 

  •      The Alliance for Wireless Power (A4WP)
  •      The Power Matters Alliance (PMA) 
  •     The Wireless Power Consortium (WPC)

    The latter is providing standard mobile chargers for Apple, Samsung, and many more in the Chinese name of Qi (pronounce as "chee") charging standards.

Qi Chargers

(pronounce as "chee" chargers)

      Now let’s talk about the smaller devices.

     These chargers can produce 5 watts but are now engineered up to 35 watts. YES! 

    The main disadvantage of these chargers is that they take a bit more time to charge when compared to wired chargers. Some chargers can be connected to the phone at a certain distance (mostly up to 25 cm).


        Looking into the pros of inductive charging, they find their application in smartwatches, tablets, mobile phones, electric razors, Drones and Service robots, IoT devices, etc.   

    Implementing them in coffee shops, a library, offices will be much more useful as they could possibly charge in the time we take a break.

Inductive charging in coffee shop

    We can reduce the amount we pay on charging cables which will be subjected to wear and tear over usage and can overcome some difficulties which we often experience on a normal as usual charger like breaking the charger while unplugging in a rush/using mobile with much effort to text someone and many more.

    On the other side, little displacement of a device will not charge a device. There are more chances they could be damaged easily. The large space between the platform and device may lead to a disconnection of cable(in the case of wired charging).

    The inductive charging gives a solution to these kinds of problems as it involves no wires to charge a device, developers are planning future with this resonant charging technology to make them charge all electronic devices in a building floor this could be made possible when their charging range is increased(practically possible with some difficulties).

    we could be sure that soon the technical problems will be rectified.


Wireless parking charger

        As electric cars are becoming the future this charging finds application as their fuel replacement. These inductive/resonance chargers can be used in parking lots, garages where we usually stop the cars and they may charge the car's battery during waiting time.

    It is a model under development in fact some companies like WiTricity, Elix Wireless are using this type of chargers in their product development. It is similar to the above discussed(inductive charging) but the power handled is higher which can be supplied by high power rated inverters.

Do they harm us?

        Absolutely not. As mobile phones charging network uses minimal magnetic field it does not damage the human in any manner and it is only effective in the little area around it.

Quick byte

Wireless charging system

     You can use any mobile inductive charger to your mobile as long as it follows the same Qi standards and your phone supports the wireless charging system. They need not be the same manufacturer. For example, you can use a Samsung charger to charge your iPhone as long as they belong to the same charging standards & have the same charger rating.

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