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Showing posts with label wireless charging. Show all posts
Showing posts with label wireless charging. Show all posts

Wednesday, 11 January 2017

How does wireless charging work?

Basic principle behind wireless charging is inductive coupling between charger and device

How does wireless charging works
Mobile with wireless charger
Content Highlights

  • How do wireless chargers work? 
  • Wireless charger circuit schematic diagram 
  • Applications of wireless charging technology 
  • Wireless charging interface standards (Qi standard) 
  • Devices with wireless charging
  • wireless charging distance
  • Advantages and benefits of wireless/inductive charging

Many modern gadgets are now switching to wireless charging.Laptop manufactures have also also welcomed this technology.Recently Dell unveiled First Wireless Charging Laptop  (Dell's 2-in-1 Latitude 7285)in CES 2017.Latest apple and samsung devices are also equiped with wireless charging support.You ever wonder 'how does wireless charging works?'.Wireless charging (Inductive charging )uses an electromagnetic field to transfer energy between two objects through electromagnetic induction.Energy is transferred through an inductive coupling to an electrical device, which can then use that energy to charge batteries or run the device.

Working of wireless chargers

You might have heard of the word 'resonance' .Resonance is a phenomenon that occurs in nature in many different forms. In general,resonance involves energy oscillating between two modes.In a system at resonance, it is possible to have a large build up of stored energy while having only a weak excitation to the system. The build-up occurs if the rate of energy injection into the system is greater than the rate of energy loss by the system.
wireless charging resonance circuit layout
An electrical/electronic resonator circuit.

Above figure represents a electrical resonator.L=inductance,R=Resistance and C=Capacitance.Resonant frequency of above circuit is given by

wireless charging resonance formula

Resonant frequency is the frequency at which maximum energy is stored in the system,If two resonators are placed in proximity to one another such that there is coupling between them, it becomes possible for the resonators to exchange energy. The efficiency of the energy exchange depends on the characteristic parameters for each resonator .Maximum energy is transferred when frequency of two resonators are same.By varying L and C ,frequency can be varied. Let Ls be the inductance coil connected to the power source Vs, and Lr is the receiver coil.When a current is passed through Ls,it creates a magnetic field around Ls.This varying magnetic field causes current flow through Lr.Thus,energy gets transferred between coils via electromagnetic induction.At resonance this energy transfer will touch it's peak.

wireless charing witricity circuit
 Two resonators are placed in proximity
Practical circuit for wireless charging applications are given below.The current induced in the receiver coil will flow through the battery connected across,and the energy gets stored in this battery.
Practical circuit for wireless charging applications
Practical circuit for wireless charging applications

Applications of wireless charging

Consumer Electronics

dell 7285 with wireless charger
Dell's 2-in-1 Latitude 7285 with wireless charging
Wireless chargers for portable consumer electronics like mobile phones,laptops,tablets,smartwatches etc..

Medical Devices

medical applications of wireless charger
Application of wireless charging in medical equipment
For charging  implanted medical devices including heart assist pumps, pacemakers, and infusion pumps etc..

Electric Vehicles

For charging full electric and hybrid vehicles.
wireless charging in electric vehicles
Wireless charging in electrical vehicles

LED Lighting

wireless LED lamp
Powering LED lamps using wireless energy transfer
LED (light emitting diode) lights can be directly powered with wireless electricity, eliminating
the need for batteries in under-cabinet task lighting, and enabling architectural lighting designers to create products that seemingly float in mid-air, with no power cord

Defense Systems

Designers of defense systems are able to utilize wireless charging to improve the reliability, ergonomics, and safety of electronic devices

Qi (standard)

Qi (pronounced 'chee ' meaning "natural energy") is an open interface standard developed by the Wireless Power Consortium for inductive charging over distances of up to 4 cm (1.6 inches). The system uses a charging pad and a compatible device, which is placed on top of the pad, charging via resonant inductive coupling.
Mobile device manufacturers that are working with the standard include Asus, HTC, Huawei, LG , Motorola ,Nokia, Samsung, BlackBerry, and Sony.

Devices having inbuilt wireless charging feature(Qi standard)

  • Samsung Galaxy: S7, S7 Edge, Note 5, S6, S6 Edge
  • Microsoft Lumia: 1520, 1020, 930, 929, 928, 920
  • Google Nexus: 4, 5, 6, 7 (2013)
  • BlackBerry: Priv
For the list of devices given above you just need to buy a wireless charger.

Devices capable of wireless charging with the help of an adapter

  • Apple: iPhone 7, iPhone 7 Plus, iPhone SE, iPhone 6S, iPhone 6S Plus, iPhone 5S
  • Samsung: Galaxy S5, Galaxy S4, Galaxy S3, Galaxy Note 3, Galaxy Note 2
  • Microsoft: Lumia 930, Lumia 925, Lumia 830
  • Sony: Xperia Z3, Xperia Z2, Xperia Z
iphone wireless charging back cover
iPhone wireless charging back cover

If your phone is in the above list, you need the accessory linked and a wireless charging pad.

Universal wireless charging adapters

If your phone doesn't support wireless charging,need not worry,you just need a universal adapter and a wireless charger. You can get these for phones with Micro USB ports (e.g. Android) and Lightning ports (e.g. iPhone).
wireless charging adaptors
Maxfield and aircharge adaptors
There are two type of universal adapters available in the market.Internal adapter, which slides into the back of a case, and an external adapter, which hangs outside. Maxfield is the leading producer of internal adpater and aircharge is the front runner in the external wireless charging adapters.

iphone 6 and maxfield wireless charging adaptor
Without any hardware modification you can charge your iphone 6 in wireless mode by connecting maxfield adaptor.

Wireless charging Distance between Charging pad and device

Wireless charging much more hassle free than wired one, but still requires the device be in physical contact with its station to actually work. That's about to change now that the Federal Communications Commission has approved the first wireless charger that works from up to three feet away.Wireless charging "at a distance" on its way to smartphones and other handheld devices.

Wireless charging:Technology Benefits

  • Make devices more convenient and thus more desirable to purchasers, by eliminating the need for a power cord.
  • Make devices more reliable by eliminating the most failure prone component in most electronic systems—the cords and connectors.
  • Make devices safer by eliminating the sparking hazard associated with conductive interconnections.
  • Reduce system cost by leveraging the ability to power multiple devices from a single source resonator.
Wireless charging and wireless power transfer technology is going to make a revolution in the consumer electronics as well as electrical appliances in coming days.A company named WiTricity specialized in wireless power solution is all ready out there in the market.More companies are coming into this field.We can expect some innovative products and technologies from such firms soon.

Monday, 9 January 2017

Dell Unveils First Wireless Charging Laptop in CES 2017

Dell's 2-in-1 Latitude 7285, the world's first wireless charging laptop

Tired of tangled wires of your laptop? Dell's new 2-in-1 Latitude 7285 brings wireless charging to laptops.
Another innovative has been presented at the January 5 event of the Las Vegas CES 2017 by Dell. Laptop maker, Dell, has unveiled its new Dell Latitude 7285 and claimed that it is the first laptop to have wireless charging feature.

Dell 2-in-1 Latitude 7285 wireless charging laptop
Dell 2-in-1 Latitude 7285

Unique features of  Dell's 2-in-1 Latitude 7285

2-in-1 feature 

The Dell Latitude 7285 unveiled at the 2017 Las Vegas CES is a 2-in-1 business laptop. With the performance of a laptop and versatility of a tablet, you can count Dell Latitude 7285 on to deliver exactly what you need.You can use it either as a laptop or a tablet.It's keypad is removable.

Wireless Charging Feature

"Dell will deliver a true wireless experience by incorporating WiTricity magnetic resonance wireless charging technology in the 12-inch Latitude 7285 2-in-1 available later this year," says the company. "When combined with a charging mat and WiGig wireless dock, users can take the Latitude 2-in-1 with them without disengaging any wires or a physical dock."

Dell Latitude 7285 Specifications

  • OS: Windows 10 OS, 
  • Display:Dell Latitude 5285 features a 12.3-inch Full HD display of 1920x1080 pixel resolution, secured further with a layer of Corning Gorilla Glass.
  • Processor:Powering the 2-in-1 laptop is a 7th-gen Intel Core CPU
  • RAM: up to 16GB of RAM. 
  • Secondary Storage:For storage, the laptop offers up to 256GB M.2 SATA SSD, up to 1TB PCIe NVMe M.2 SSD or up to 512GB PCIe OPAL M.2 SSD.
  • Camera:The hybrid laptop has an 8MP rear camera and a 5MP front-facing shooter for selfies.
  • Connectivity: For connectivity, it offers Wi-Fi, Bluetooth, USB 3.0, microSD and SIM.
  • Battery backup:The company claims that the 2-in-1 can deliver up to 6 hours of battery backup in tablet mode and up to 9 hours when it is attached to the keyboard base.

Dell Latitude 7285 Pricing

Dell has yet to offer any pricing details for  Latitude 7285 2-in-1, or announce a specific release date.Dell says that it will offer more details about the device and its wireless charging capability at the DELL EMC World 2017 event in May.
The Latitude 5285 2-in-1(without wireless charging), for instance, will go on sale starting in February at an $899 price point.You can expect a price range of $1999 to $1299 for Latitude 7285 2-in-1 wireless charging model and commercial launch by the end of second quarter of 2017.
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