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How Qi Wireless Charging Works
How Qi Wireless Charging Works
Published: 2015/10/16
Channel: ThioJoeTech
Eripu Qi Wireless Charging Pad Review
Eripu Qi Wireless Charging Pad Review
Published: 2016/02/29
Channel: Galaxy Tech Review
Fantasy Qi Standard Wireless Charger
Fantasy Qi Standard Wireless Charger
Published: 2016/08/26
Channel: R0CKY Tube
2016: Best Wireless Qi Charging Pad | Review & Comparison
2016: Best Wireless Qi Charging Pad | Review & Comparison
Published: 2016/05/04
Channel: ILuvTrading
DIY QI Wireless Charger
DIY QI Wireless Charger
Published: 2013/03/09
Channel: PicplayerAudio
Samsung Wireless Charging Pad for Galaxy S6 / S6 edge - Qi Standard
Samsung Wireless Charging Pad for Galaxy S6 / S6 edge - Qi Standard
Published: 2015/04/19
Channel: TechCloud
Wie funktionert ein kabelloses Ladegerät basierend auf QI Standard  (German-Deutsch) ElectroFame
Wie funktionert ein kabelloses Ladegerät basierend auf QI Standard (German-Deutsch) ElectroFame
Published: 2014/10/19
Channel: ElectroFame
QI Wireless charger for SAMSUNG Galaxy S3 I9300
QI Wireless charger for SAMSUNG Galaxy S3 I9300
Published: 2012/11/06
Channel: V-CEN Kolar
How To Use Qi Wireless Charging On Your Smartphone - Compatible All Devices - ElectroFame
How To Use Qi Wireless Charging On Your Smartphone - Compatible All Devices - ElectroFame
Published: 2014/11/04
Channel: Rosemarie Benson
REVIEW: Universal MicroUSB Qi Wireless Charger Adapter (Receiver)
REVIEW: Universal MicroUSB Qi Wireless Charger Adapter (Receiver)
Published: 2015/03/21
Channel: OSReviews
qi standard fast charging wireless charger
qi standard fast charging wireless charger
Published: 2016/09/19
Channel: Gesp Technology
Wireless Charger Pad for QI Standard
Wireless Charger Pad for QI Standard
Published: 2014/08/18
Channel: NeWisdom Valley
Fantasy Qi Wireless Charging
Fantasy Qi Wireless Charging
Published: 2016/05/19
Channel: Brandon Bain
QI Standard iPhone 5 Wireless Charging Case
QI Standard iPhone 5 Wireless Charging Case
Published: 2013/08/30
Channel: iviyAdap iviyNanan
Metrans Qi Standard Wireless Charger
Metrans Qi Standard Wireless Charger
Published: 2013/05/30
Channel: charlie chen
How to retrofit your smartphone with Qi wireless charging
How to retrofit your smartphone with Qi wireless charging
Published: 2014/12/31
Channel: Pocketnow
Samsung Wireless Charging Pad Qi Original
Samsung Wireless Charging Pad Qi Original
Published: 2015/05/18
Channel: TM Videos
Qi Wireless Charger Receiver, Transmitter For iPhone 6 - Test
Qi Wireless Charger Receiver, Transmitter For iPhone 6 - Test
Published: 2015/06/16
Channel: MEDIASSOFT
QI Standard Portable Wireless Power Pack "OwlPad/pwp"
QI Standard Portable Wireless Power Pack "OwlPad/pwp"
Published: 2014/05/30
Channel: Moon Soo Choi
Carregador SEM FIO Qi Standard Wireless Charging Transmitter DealExtreme
Carregador SEM FIO Qi Standard Wireless Charging Transmitter DealExtreme
Published: 2013/11/09
Channel: SombrasNoturnas
Nillkin Magic Disk II QI Wireless Charger For Samsung Galaxy S6/S6 Edge iPhone 6 LG Nexus 5 6
Nillkin Magic Disk II QI Wireless Charger For Samsung Galaxy S6/S6 Edge iPhone 6 LG Nexus 5 6
Published: 2015/01/28
Channel: Christopher Fuller
Nillkin Phantom Qi Wireless Charging Lamp | The Most Futuristic Wireless Charger
Nillkin Phantom Qi Wireless Charging Lamp | The Most Futuristic Wireless Charger
Published: 2015/05/27
Channel: TeQreation
Wireless charging pad for NEXUS 5 /Qi standard.
Wireless charging pad for NEXUS 5 /Qi standard.
Published: 2013/11/10
Channel: Tech4 Networkers
How I Finally Set Up Qi Wireless Charging for my Phone!
How I Finally Set Up Qi Wireless Charging for my Phone!
Published: 2014/11/15
Channel: Makeup at Midnight
Wireless Qi Car Mount for Galaxy S6/S6 Edge! [iOttie Easy OneTouch Wireless]
Wireless Qi Car Mount for Galaxy S6/S6 Edge! [iOttie Easy OneTouch Wireless]
Published: 2015/05/21
Channel: Max Lee
Nexus 4 wireless charging (Qi standard)
Nexus 4 wireless charging (Qi standard)
Published: 2012/12/22
Channel: youwkh
QI Standard MC 01 Wireless Charger + Receiving Module for Samsung Galaxy S3   DX
QI Standard MC 01 Wireless Charger + Receiving Module for Samsung Galaxy S3 DX
Published: 2013/08/19
Channel: Janee Malachowski
Mindzo W07 Qi Standard Wireless Charger - GearBest обзор
Mindzo W07 Qi Standard Wireless Charger - GearBest обзор
Published: 2016/07/02
Channel: Docent Mind
Sunwee Qi Standard 3 Coils Wireless Charging Stand Review
Sunwee Qi Standard 3 Coils Wireless Charging Stand Review
Published: 2015/07/18
Channel: Galaxy Tech Review
CES 2012 - eCoupled - Qi Standard - Fulton Innovation
CES 2012 - eCoupled - Qi Standard - Fulton Innovation
Published: 2012/01/11
Channel: ecoupled
New Zero Heat LC-X5 Qi Standard Mobile Wireless Power Charger
New Zero Heat LC-X5 Qi Standard Mobile Wireless Power Charger
Published: 2014/03/31
Channel: Buy now
Qi Wireless Charger Ultra-Slim Qi Wireless Charging Pad
Qi Wireless Charger Ultra-Slim Qi Wireless Charging Pad
Published: 2016/06/07
Channel: Review Home
iOttie Easy Flex Wireless Qi Charging Car Mount Review!
iOttie Easy Flex Wireless Qi Charging Car Mount Review!
Published: 2014/08/01
Channel: muwen360
Nillkin Qi Standard Business Wireless Charger
Nillkin Qi Standard Business Wireless Charger
Published: 2015/10/29
Channel: Everbuying
How to install the LG G3 QI Standard wireless charging chip
How to install the LG G3 QI Standard wireless charging chip
Published: 2014/11/17
Channel: NeWisdom Valley
QI WIRELESS CHARGING PAD Lerway Wirelessr Charger Pad
QI WIRELESS CHARGING PAD Lerway Wirelessr Charger Pad
Published: 2013/11/22
Channel: Charlie Charles
Best Masione™ QI Standard Portable Wireless Charger Pad & Receiver Tag Charging Module
Best Masione™ QI Standard Portable Wireless Charger Pad & Receiver Tag Charging Module
Published: 2016/12/31
Channel: Interest reviews
Wie funktionert ein kabelloses Ladegerät basierend auf QI Standard  (German-Deutsch) ElectroFame
Wie funktionert ein kabelloses Ladegerät basierend auf QI Standard (German-Deutsch) ElectroFame
Published: 2014/11/04
Channel: Rosemarie Benson
Беспроводные зарядки Qi. Обзор 3х устройств
Беспроводные зарядки Qi. Обзор 3х устройств
Published: 2016/04/04
Channel: gadget.letnick.com
Enable Qi Wireless Charging On Samsung Galaxy Note 4
Enable Qi Wireless Charging On Samsung Galaxy Note 4
Published: 2014/11/11
Channel: Geekyranjit
Itian C1 Qi Wireless Car Charger from GearBest
Itian C1 Qi Wireless Car Charger from GearBest
Published: 2015/06/12
Channel: Gear Obsession
QI Standard Wireless charger kits include sender and receiver-szokla.com-china phone parts wholesale
QI Standard Wireless charger kits include sender and receiver-szokla.com-china phone parts wholesale
Published: 2016/01/08
Channel: OKLA TECH
Review : การใช้งาน wireless charging (qi standard) สำหรับ Samsung Galaxy S6 & S6 Edge
Review : การใช้งาน wireless charging (qi standard) สำหรับ Samsung Galaxy S6 & S6 Edge
Published: 2015/06/10
Channel: Gadzbox
How To Get Qi Wireless Charging On Your iPhone 6 and 6 Plus Or Any Lightning Device!
How To Get Qi Wireless Charging On Your iPhone 6 and 6 Plus Or Any Lightning Device!
Published: 2014/12/15
Channel: OT4Tech
Qi Global Wireless Power Standard
Qi Global Wireless Power Standard
Published: 2014/09/30
Channel: Freedy Korea
Induktivo - Möbel - Induktives laden mit dem Qi-Standard (Test mit einem Iphone/Nexus)
Induktivo - Möbel - Induktives laden mit dem Qi-Standard (Test mit einem Iphone/Nexus)
Published: 2014/04/20
Channel: Induktivo
QI - Why Do We Use QWERTY Keyboards?
QI - Why Do We Use QWERTY Keyboards?
Published: 2015/04/06
Channel: QI: Quite Interesting
Samsung Galaxy S5: How to Install Qi Wireless Charger Adapter
Samsung Galaxy S5: How to Install Qi Wireless Charger Adapter
Published: 2015/01/12
Channel: ITJungles
SZHunter HB 20 Qi standard Wireless Charger, great for wireless charging
SZHunter HB 20 Qi standard Wireless Charger, great for wireless charging
Published: 2016/11/14
Channel: Char H
3 Coil Wireless Qi Charging Pad and Qi Receiver for Galaxy S5 Review - $25 on ebay
3 Coil Wireless Qi Charging Pad and Qi Receiver for Galaxy S5 Review - $25 on ebay
Published: 2014/05/21
Channel: adrockr2
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Qi
The Qi logo, which consists of a round-esque, lowercase "q" with a semicircle at the right parallel to its stem and a circle on top.
The Qi logo, consisting of a lowercase "q" with a semicircle-esque "i" with a circle on top
Status Active
Year started 2008; 9 years ago (2008)
First published 2008; 9 years ago (2008)
Latest version 1.2.2
Organization Wireless Power Consortium
Committee Wireless Power Consortium
Domain Inductive charging
License Open standard
Copyright Logo and trademark

Qi (pronounced CHEE;[1] IPA: /tʃiː/, from the Chinese word "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).[2] The system uses a charging pad and a compatible device, which is placed on top of the pad, charging via resonant inductive coupling.[3]

Mobile device manufacturers that are working with the standard include Asus, HTC, Huawei, LG Electronics, Motorola Mobility, Nokia, Samsung, BlackBerry, and Sony.[4] According to a list of Qi devices by Qi Wireless Charging,[5] as of 14 July 2016 there were over 140 smartphones, tablets and other devices which can be charged wirelessly with Qi.

Features and specifications[edit]

Under the Qi specification, "low power" for inductive transfers denotes power deliveries below 5 W. Systems that fall within the scope of this standard are those that use inductive coupling between two planar coils to transfer power from the power transmitter to the power receiver. The distance between the two coils is typically 5 mm. It is possible to extend that range to at least 40 mm.[2]

Regulation of the output voltage is provided by a digital control loop where the power receiver communicates with the power transmitter and requests more or less power. Communication is unidirectional from the power receiver to the power transmitter via backscatter modulation. In backscatter modulation, the power-receiver coil is loaded, changing the current draw at the power transmitter. These current changes are monitored and demodulated into the information required for the two devices to work together.[3]

The bottom side of an LG WCP-300 Qi charging pad
Opened Nokia DT-900 Qi charger

The WPC published the Qi low-power specification in August 2009.[6] The Qi specification can be downloaded freely after registration.[7] In 2011, the Wireless Power Consortium began to extend the Qi specification to medium power.[8][9] The low-power specification delivers up to 5 W (typically used to charge mobile devices), and the medium-power specification will deliver up to 120 W (typically used to power displays and laptops). In 2015, WPC demonstrated a high-power specification that will deliver up to 1 kW, allowing the powering of kitchen utensils among other high-power utilities.[7]

Adoption[edit]

As the Qi standard gains popularity, it is expected that Qi Hotspots will begin to arise in places such as coffee shops, airports, sports arenas, etc.[6] The Coffee Bean and Tea Leaf, a major US coffee chain, will install inductive charging stations at selected major metropolitan cities,[10] as well as Virgin Atlantic Airways, for United Kingdom's London Heathrow Airport[11] and New York City's John F. Kennedy International Airport.[12]

Furniture retailer IKEA introduced lamps and tables with integrated wireless chargers for sale in 2015.[13] Also starting in 2015 the Lexus NX will offer an available Qi charging pad in the center console.[14]

System overview[edit]

Devices that operate with the Qi standard rely on electromagnetic induction between planar coils. A Qi system consists of two types of devices – the Base Station, which is connected to a power source and provides inductive power, and Mobile Devices, which consume inductive power. The Base Station contains a power transmitter that comprises a transmitting coil that generates an oscillating magnetic field; the Mobile Device contains a power receiver holding a receiving coil. The magnetic field induces an alternating current in the receiving coil by Faraday's law of induction. Close spacing of the two coils, as well as shielding on their surfaces, ensure the inductive power transfer is efficient.

Base Stations typically have a flat surface—referred to as the Interface Surface—on top of which a user can place one or more Mobile Devices. There are two methods for aligning the transmitting coil (part of the Base Station) and receiving coil (part of the Mobile Device) in order for a power transfer to happen. In the first concept—called guided positioning—a user must place the Mobile Device on a certain location of the Base Station's surface. For this purpose, the Mobile Device provides an alignment aid that is appropriate to its size, shape and function. The second concept—referred to as free positioning—does not require the user to place the Mobile Device in direct alignment with the transmitting coil. There are several ways to achieve free positioning. In one example a bundle of transmitting coils is used to generate a magnetic field at the location of the receiving coil only. Another example uses mechanical means to move a single transmitting coil underneath the receiving coil. A third option is to use a technique called "Multiple Cooperative Flux Generators."[15]

Fig. 1-1

Figure 1-1 illustrates the basic system configuration. As shown, a power transmitter includes two main functional units—a power conversion unit and a communications and control unit. The diagram shows the transmitting coil (array) generating the magnetic field as part of the power conversion unit. The control and communications unit regulates the transferred power to the level that the power receiver requests. The diagram also demonstrates that a Base Station may contain numerous transmitters, allowing for multiple Mobile Devices to be placed on the same Base Station and inductively charge until each of its batteries are fully charged. Finally, the system unit in the diagram comprises all other functionality of the Base Station, such as input power provisioning, control of multiple power transmitters, and user interfacing.

A power receiver comprises a power pick-up unit, as well as a communications and control unit. Similar to the power conversion unit of the transmitter, Figure 1-1 illustrates the receiving coil as capturing the magnetic field of the power pick-up unit. A power pick-up unit typically contains a single receiving coil only. Moreover, a Mobile Device typically contains a single power receiver. The communications and control unit regulates the transferred power to the level that is appropriate for the subsystems (e.g., battery) connected to the output of the power receiver. These subsystems represent the main functionality of the Mobile Device.

See also[edit]

References[edit]

External links[edit]

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