Wireless Power Transfer
Ing. Nicolò Antonante
Field Application Engineer
Würth Elektronik Italy
[email protected]
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Agenda
Standards
Coils basics and technologies
Wireless Power Consortium & Qi Standard
WE Products and advantages
WPCC Demo
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Standards
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War of Standards
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How does Wireless Power Charging work?
Power transfers via inductive coupling at short
distances (mm range)
Transmitter (Tx) and Receiver (Rx) Coils are
inductively coupled coils
Magnetic field concentrated in small volume
between Tx / Rx
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Industry Accepted Standardization: Qi Standard
Standardization increases consumer confidence and
demand
Qi “气” (Chee: “Vital Energy” in Asian Philosophy - An
Intangible Flow of Power)
Industry standard developed by Wireless Power
Consortium (WPC)
Rapid industry-wide adoption
(200+ Members)
More than 500 approved products in the market
Würth Electronics is an official member of the WPC
http://www.wirelesspowerconsortium.com/memberlist/
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Alliance for Wireless Power (A4WP) –
Flexible coupling technology at 6.78MHz
Würth Elektronik is member of A4WP as well
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Comparison Standards 4/2014
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Applications
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Application - Accessories
Multiple Charging Pads
Chargers
Phone/Tablet Sleeves
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Application - Furniture
Wireless Power in every desk
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Application - Automotive
Use time in car for convenient charging
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Application – Medical Devices
Easy to clean & sanitize
Hermetic sealing
No contact degradation due to aggressive solvents
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Coils basics and technologies
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How does Wireless Power Charging work?
Power transfers via inductive coupling at short
distances (mm range)
Transmitter (Tx) and Receiver (Rx) Coils are
inductively coupled coils:
AC current in Tx coil generates a magnetic
field, which induces a voltage in Rx coil. Rx
voltage may be used to power a mobile
device or charge a battery
Magnetic field concentrated in small volume
between Tx / Rx
Improve coupling effect between coils by:
matching coil size
flat surface between coil to keep distance
small
shielding and aligning of coils
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Magnetic coupling
Transmission depends on the position of the
coils
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Coupling factor / alignment tolerances
In general, for any coil type the magnetic coupling
factor K can be improved by reducing the;
1.
2.
Vertical distance and
Coil misalignment
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Coil without Shield with battery
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Coil with shield and battery
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Improvement using ferromagnetic shielding
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Quality factor – definition
Wurth part 760308100111
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Skin effect
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WE-FSFS Flexible Sintered Ferrite Sheet
Technical Information
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Flexible ferrite sheet with adhesive tape
High permeability
Low losses at communication frequency
Easy to apply adhesive mounting tape
Operating temperature
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-40°C ~ +85°C
Improve efficiency of Wireless Power Transfer
Improve performance of NFC and RFID
communication systems
EMI Suppression
Magnetic Shielding
Custom designs on request
Length, stampings,…
Attention: Technical drawing is needed!!
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WE-FSFS Flexible Sintered Ferrite Sheet
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WE-FSFS vs WE-FAS
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Wireless Power Consortium
Qi Standard
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The Power of Qi
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QI Standard System Overview
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WIRELESS POWER
CONSORTIUM
Communication (Modulation)
Transmitter
Receiver
Cp
+
-
Lp
Cs
Ip Vp
Load
Ls
Cd
Modulation
Cm
Modulation
C
Rm
Power
How it works
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Foreign object detection (FOD) (1)
Qi-standard V1.1
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Foreign object detection (FOD) (2)
Qi-standard V1.1
The difference between transmitted and received power indicates power loss
If the difference indicates an unexpected power loss, the power transmitter
terminates the power transfer
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WE Products and advantages
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Wireless Power Coils WE-WPCC
- Tx/Rx coils
Fully compliant to WPC Qi standard
Efficiency up to 85%
Supreme shielding characteristics for low leakage
inductance
Outstanding performance due to usage of litz wire:
lowest RDC
highest Q values
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WE Wireless Power Coils –
Product Program - Transmitters
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WE Wireless Power Coils –
Product Program - Receivers
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WE-WPCC Products
760 308 101
760 308 105
760 308 110
760 308 111
760 308 100 111 760 308 201 760 308 103 202
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760 308 106
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Structure of thin receiver coils
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WE-WPCC
NEW round pot core transmitter A10, A11
760 308 100 110
760 308 100 111
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WE Wireless Power Coils
New Receiver design:
Smaller receivers on thin flexible ferrite
Round small receivers on thin flexible ferrite
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WPCC Demo Kit
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Thank you
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