Nfc Based Wireless Charging System
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Transcript of Nfc Based Wireless Charging System
NFC BASED WIRELESS CHARGING SYSTEM
Wireless battery charging, state-of-the-art
Why to charge wirelessly?• Easy-to-use charging facility• Avoiding external galvanic contacts that can be
unreliable or impractical Wireless Power Consortium (http://www.wirelesspowerconsortium.com/) has released a specification (Qi 1.0) for wireless charging of mobile handsets
Wireless battery charging, state-of-the-art
• Charging power up to 5 W (the main target application is mobile handsets)
• Inductive coupling, operating frequency 110 - 205 kHz commercial products with proprietary wireless charging
• e.g. electric toothbrushes• challenge: different approaches, versatility
Wireless battery charging, state-of-the-art
NFC-enabled wireless charging– technical baseline
• The main issue of NFC-enabled wireless charging is combining controllable wireless power transfer and NFC communication into the same implementation with shared antennas and communication channels.
• Similarly to wireless charging technologies, NFC is by construction:
NFC-enabled wireless charging– technical baseline
• based on inductive coupling between loop antennas, and
• capable of simultaneous power transfer (powering of passive tags) and bidirectional
• communication between the devices • However, the power transfer level of current
NFC implementations is much lower than needed in charging of typical mobile devices.
Requirements/challenges for thetechnical implementation
• On RF level, the NFC implementations have to be amended so that the NFC interface can transmit enough power to a compatible receiver and receive power from a compatible power transmitter with good efficiency
• On protocol level, the charging power transmission has
to feature continuous carrier generation and charging management based on message exchange between the charger device and the device to be charged.
Requirements/challenges for thetechnical implementation
• In contrast to conventional NFC interactions, close and long-lasting proximity between
• the transmitter and the receiver is needed, which also affects the mechanical and
• usability design of the charger device and the device to be charged.
• The amendments have to be made without major cost impacts and by retaining the
• NFC-compatibility without compromising NFC communication performance
EX OF POTENTIAL USE CASES
Wireless charging of small NFC enableddevices
EX OF POTENTIAL USE CASES
Delaying out of battery status ofmobile handsets
BENEFITS
• More compact and cost efficient wireless charging interface for small NFC-enabled portable devices
• More pervasive charger infrastructure (based on existing NFC devices) with reduced costs (no dedicated chargers)
• Extending battery discharging time of mobile handsets
BENEFITS
• Convenient overnight charging facility of mobile handsets
• Possibility to integrate NFC-based service to charging applications
• Benefits of 13.56 MHz over lower operating frequencies typically used in wireless charging
• Lighter antennas• Higher frequency reduces parasitic heating of
metallic stray objects
BUSINESS OPPORTUNITIES
Standardized NFC charging provides opportunity to NFC community members to
• create new applications and business models in top of the future NFC infrastructure,
• join the ”heating” market of wireless charging.
BUSINESS OPPORTUNITIES
The charging feature will:• boost the penetration of NFC especially to small
devices such as wrist units,headsets, remote controllers, mouses, sensors etc.
• produce added value to NFC-enabled mobile handsets by auxiliary charging via their NFC interface
• enable totally new NFC products related to wireless charging.
Business opportunities
• The resulting added value of NFC-enabled products increases public interest towards NFC.
• Increased revenue for NFC technology, device and application vendors.
CONCLUSION
• The relatively high (13.56 MHz) operating frequency of NFC (compared to the WPC Qi 110 - 205 kHz) favors use cases with relatively low charging power level.
• Still, charging power levels over 1 W are possible with close proximity between the antennas even within the RF field strength limit of the current NFC specification
CONCLUSION
• NFC-enabled charging will be rather a completing than a competing technology to WPC Qi specification.
• NFC-compatibility won't increase the power level or improve the power efficiency.
• NFC-compatibility will improve the compactness and cost-efficiency of the entire implementation (more detailed lists of benefits after examples of potential use cases).
THANK YOU