WIRELESS POWER TRANSFER
Würth Elektronik eiSos GmbH
October, 2015
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Content
 Applications
 Technologies & Standards
 Coil Specific Considerations
 Würth Elektronik Products & Advantages
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JHant / CSo | Confidential | Wireless Power 2015
© All rights reserved by Würth Elektronik, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us.
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Applications
JHant / CSo | Confidential | Wireless Power 2015
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Application Areas besides Consumer Products
Industrial
Automotive
Medical Technology
Furniture / Infrastructure
JHant / CSo | Confidential | Wireless Power 2015
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WIRELESS POWER
CONSORTIUM
Cordless Kitchen
13 July 2012
Power for
appliances
everywhere
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Technologies and Standards
JHant / CSo | Confidential | Wireless Power 2015
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Inductive and Resonant Coupling
Evanescent wave coupling
Rx
Rx
Rx
Tx
Tx
B Field
B Field
inductive power transfer
B Field
B Field
resonant power transfer
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JHant / CSo | Confidential | Wireless Power 2015
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WIRELESS POWER
CONSORTIUM
Inductive Wireless Power Transfer
Transmitter
Receiver
Cp
+
-
Lp
Cs
I p Vp
Cd
Load
Ls
Power
Modulation
Cm
Modulation
C
Rm
The Power of Qi
How to get a Qi-certified product?
Product must fulfill the requirements of Qi low power
specification downloadable from
http://www.wirelesspowerconsortium.com
Part1: Interface definition (public)
Part2: Performance Requirements (for members only)
Part3: Compliance testing (for members only)
Product must be certified – Qi authorized
test labs are:
• TÜV Rheinland, Korea
• TÜV Rheinland, Taiwan
• CETECOM, Germany
• DLS electronic systems, USA
Product certification is available only to members of
the WPC.
JHant / CSo | Confidential | Wireless Power 2015
© All rights reserved by Würth Elektronik, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us.
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JHant / CSo | Confidential | Wireless Power 2015
© All rights reserved by Würth Elektronik, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us.
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Coil specific considerations
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JHant / CSo | Confidential | Wireless Power 2015
© All rights reserved by Würth Elektronik, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us.
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Skin Effect
The penetration depth δ can be described with
the following formula:
ρ
ω
µ
specific resistance
angular frequency
sheared effective permeability (e.g.: 100)
Source: en.wikipedia.org
JHant / CSo | Confidential | Wireless Power 2015
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Proximity Effect
The proximity effect causes current constriction or current displacement in
closely spaced conductors.
Source: itwissen.info
Source: electrical4us.com
JHant / CSo | Confidential | Wireless Power 2015
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Coupling factor / alignment tolerances
Good coupling and maximum energy transmission depends on
 size of the effective area of the receiver coil in the magnetic field
 the distance in the z direction
A coupling factor of 1 is ideal
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JHant / CSo | Confidential | Wireless Power 2015
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Improvement using ferromagnetic shielding
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JHant / CSo | Confidential | Wireless Power 2015
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WE Products & Advantages
JHant / CSo | Confidential | Wireless Power 2015
© All rights reserved by Würth Elektronik, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us.
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Würth Elektronik Wireless Power Coils WE-WPCC
 Fully compliant to WPC Qi standard
 Efficiency up to 93%
 Supreme shielding characteristics for low leakage
inductance
 Outstanding performance due to usage of litz wire:
 lowest RDC
 highest Q values
JHant / CSo | Confidential | Wireless Power 2015
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Structure of thin receiver coils
JHant / CSo | Confidential | Wireless Power 2015
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WE Wireless Power Coils – 9/2015
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Transmitter Coils
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Receiver Coils
http://katalog.we-online.de/en/pbs/browse/Power_Magnetics/Wireless_Power_Transmission
JHant / CSo | Confidential | Wireless Power 2015
© All rights reserved by Würth Elektronik, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us.
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JHant / CSo | Confidential | Wireless Power 2015
© All rights reserved by Würth Elektronik, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us.
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Thank you
JHant / CSo | Confidential | Wireless Power 2015
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