multi mode receiver design - wireless power consortium€¦ · mark estabrook . director strategic...
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Mark Estabrook Director Strategic Marketing - MediaTek
Wireless Power Solutions | MediaTek September, 2015
Multi Mode Receiver Design To Accelerate Wireless Power Market Adoption
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Wireless-Power Ecosystem Diversity
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Today’s Wireless Power Ecosystems are Self Contained and Divided Competing Ecosystems Create a Road Block to WW Wireless Power Adoption
But there is hope…
Qi/PMA Dual mode products are just starting to emerge (e.g. SGS6) Qi/PMA/A4WP Multi mode receiver products are emerging (see tradeshow)
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Each Standard Has Benefits
Feature/Benefit Qi PMA A4WP Notes
Market maturity, lowest cost today
++ ++ Qi & PMA have been in the market for years, Qi has the highest volume
Coil Area (e.g. 5W Phones) X X 2-3X
Power control IB IB BLE IB = In Band, potentially lower cost
Efficiency ++ ++ + Due to tight coupling and frequency choice
EMI sensitivity ++ ++ + Tight coupling minimizes stray EMI
Freedom of placement + + ++ Loose coupling
Interoperability of different size coils / power levels
+ + ++ Loose coupling
Multiple device support No No Yes With a single Tx coil
Distance Charging + + ++ Low = ~ 5mm, High = ~45mm
Charging continuity in presence metals
+ + ++ Sensitivity to metals causes FOD schemes to interrupt or prevent charging
Based on standards Qi 1.1.2, PMA 1.0, A4WP 1.2
Tightly Coupled, low frequency
Loosely coupled, high frequency
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Essential Differences Tightly Coupled (TC) vs Loosely Coupled (LC)
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▪ All the Standards are “resonant”
▪ Higher Q resonance yields higher efficiency, especially at distance (i.e. LC)
▪ All WP system designers strive to minimize loss, and thus maximize Q
▪ Higher operation frequency generally helps to maximize Q • Inductor Q=ωL/R
Coil to Coil Efficiency
n = efficiency K = coupling Q = quality factor of resonance
TC LC
0
20
40
60
80
100
0 20 40 60 80 100
low Q resonance (1:1) high Q resonance (1:1)
Coil separation (Z height) in mms
Effic
ienc
y (%
)
Coil to Coil Efficiency (simulated)
Low frequency, low Q
Higher frequency, higher Q
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Use Case May Help Decide Tightly vs. Loosely Coupled
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▪ Higher Q cannot overcome the loss in k entirely, but many advantages can be had • Freedom of movement • Different coil sizes on Rx • Multi device support
▪ Can we build solutions that can take advantage of
each standard? YES
TC • 1: 1 • Ltd freedom • 0.3 < k < 0.7
LC • 1: Many • Ext. freedom • k < 0.3
Tx coil
Rx coil(s)
3D Coil-Coil Efficiency • 1mm Z gap • Qi A6 •A4WP Class 3 • DC-DC measured, electronic losses removed
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What Makes These Standards Different?
Feature
Comms Protocols
Power Transfer • Tightly vs. Loosely Coupled
Operating Frequency
Difference This is just a language. The
essential algorithm for power transfer is similar
Higher Q coils allow greater design flexibility with the same efficiency, but system operate on same principles
Qi & PMA are of similar frequencies, and A4WP is a very different frequency
2014-11-20 Copyright © MediaTek Inc. All rights reserved. 6
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Frequency of Operation Does Create a Fence
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Loosely Coupled
HF TX
RX
Tightly Coupled
LF TX
RX
Operating Frequency Fence
100-300kHz
6.78 MHz
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We Can Use Frequency To Our Advantage
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▪ Low cost approach w/single: • Coil • Matching network • Power path
▪ Matching circuit delivers power
at the desired frequency
LF MI Mode HF MR Mode
HF
LF
ZC>1000 Ω
ZL<0.4 Ω ZL>600 Ω
CS CS
ZC<0.4 Ω Rx Case…
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We Can Use Frequency To Our Advantage
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▪ Low cost approach w/single: • Coil • Matching network • Power path
▪ Matching circuit delivers power
at the desired frequency
LF MI Mode HF MR Mode
HF
LF
ZC>1000 Ω
ZL<0.4 Ω ZL>600 Ω
CS CS
ZC<0.4 Ω Rx Case…
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Multi Mode Receiver Designs are Here
▪ Device, MT3188 • In Mass Production
▪ Certification • WPC 1.1.2 Mar, 2014 • PMA 1.0 Dec, 2014 • A4WP 1.2 Feb, 2015
55mm
73 mm
55mm
19 mm
See Kupiin sleeves at the Tradeshow !
MediaTek MT3188 Multimode Rx
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Multi Mode Transmitter Considerations
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▪ 1:1 Transmitter • Single coil option similar to Rx coil designs • Multi TC coil offers freedom of placement
for TC devices ▪ 1:Many Transmitter
• Freedom of placement for multiple devices
Tx - 1:1 Single coil LC Single coil TC Tx - 1:1
Single LC coil Multi TC coil
Tx - 1:Many Single LC Coil Multi TC coil
•Simplest option •TC coils may de-tune LC coil
•May have user ‘dead’ spots for TC devices •TC coils may de-tune LC coil •High complexity
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To Date Companies are Moving Towards Rx Implementations
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▪ Companies have announced Rx solutions first including… • MediaTek MT3188 • Broadcom BCM59350 • IDT IDTP9700
▪ The infrastructure market is asking for multimode transmitters; none are announced
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Summary
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▪ Technology can support multi-frequency solutions for both transmitters and receivers; receivers are simpler and will be sooner to market
▪ Multi-frequency, multi-standard products are already emerging on the market. Let’s welcome them.
▪ Multi-standard wireless power products can be a contemporary approach to promote world wide acceptance of wireless charging
▪ Use cases can be drive the best technology/standard choice
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