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WIRELESS POWER TRANSFER

Würth Elektronik eiSos GmbH

October, 2015

2JHant / 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. www.we-online.com

Content

Applications

Technologies & Standards

Coil Specific Considerations

Würth Elektronik Products & Advantages



Applications



Application Areas besides Consumer Products

Industrial

Medical Technology

Furniture / Infrastructure

Automotive

WIRELESS POWER

C O N S O R T I U M

Cordless Kitchen

13 J

uly

2012

5

Power for

appliances

everywhere



Technologies and Standards



Rx

B Field

Rx

Rx

inductive power transfer resonant power transfer

Inductive and Resonant Coupling

Tx

B Field

Tx

B Field

B Field

Evanescent wave coupling

WIRELESS POWER

C O N S O R T I U M

Transmitter

Cp

Lp

+

-

Receiver

Inductive Wireless Power Transfer

Cd

Ls

Cs

C Rm

ModulationModulation

Cm

IpVp

Load

Power



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.

http://www.wirelesspowerconsortium.com/





Coil specific considerations



The penetration depth δ can be described with

the following formula:

ρ specific resistance

ω angular frequency

µ sheared effective permeability (e.g.: 100)

Skin Effect

Source: en.wikipedia.org

//upload.wikimedia.org/wikipedia/commons/6/61/Skin_depth.svg

//upload.wikimedia.org/wikipedia/commons/6/61/Skin_depth.svg

//upload.wikimedia.org/wikipedia/commons/c/c7/Skineffect_reason.svg

//upload.wikimedia.org/wikipedia/commons/c/c7/Skineffect_reason.svg



Proximity Effect

Source: electrical4us.com

The proximity effect causes current constriction or current displacement in

closely spaced conductors.

Source: itwissen.info



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



Improvement using ferromagnetic shielding



WE Products & Advantages



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



Structure of thin receiver coils



15 Transmitter Coils

15 Receiver Coils

WE Wireless Power Coils – 9/2015

http://katalog.we-online.de/en/pbs/browse/Power_Magnetics/Wireless_Power_Transmission

http://katalog.we-online.de/en/pbs/browse/Power_Magnetics/Wireless_Power_Transmission





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