In previous posts we discussed how some standard as well above-standard (intelligent) chargers work. In this post we will discuss some interesting techniques used by battery chargers.
USB Chargers
USB stands for Universal Serial Bus, a standard for cable connection between a computer and its peripherals (mouse, keyboard, printer, etc.). USB also supplies electric power, to the tune of 5V, to the peripherals for their functioning. So theoretically, any device connected to a USB can get power supply. A USB cable is used to connect the battery to the USB port of a computer for charging. Mobile phones, tablets, cameras, etc. can get charged in this fashion.
Induction Chargers
Induction chargers use electromagnetic force to charge a battery. You know from a previous post that wires carrying electric current generate a magnetic field around them. Also, a magnet with varying magnetic fields generates electric current. The inductive charger sends out magnetic fields, which are received by the device that needs to be charged. The device converts the power from electromagnetic field to electrical power, which charges the battery. Electric toothbrushes were the first to use this technique. Read more about inductive charging here.
Photo Courtesy: http://blog.laptopmag.com/
Solar Chargers
Solar chargers convert solar power to DC current. This current is then used to charge batteries. The disadvantage with solar power is that the availability of sunlight varies with climate and time. Solar chargers are usually used as trickle chargers.
Photo Courtesy: http://www.inglue.com/
Motion-powered Chargers
Motion powered chargers use rhythmic human body movement (like running or peddling) to charge a battery. It’s a simple case of converting kinetic energy to electric energy. In case you are wondering, kinetic energy is energy gained by a body due to its motion. Such chargers have not gained commercial success but in the future, you might actually be charging your mobile or iPad while jogging or running!!
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