multi mode receiver design - wirelesspowerconsortium.com · june, 2015 multi mode receiver design...
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Mark Estabrook
Wireless Power Solutions | MediaTekJune, 2015
Multi Mode ReceiverDesign
To Accelerate Wireless Power Market Adoption
Wireless-Power Ecosystem Diversity
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Several WP ecosystems coexist now, fighting for market share , confusing customers with “I am the best..” statements
Today’s Wireless Power Ecosystems are Self Contained and Divided Competing Ecosystems Create a Road Block to WW Wireless Power Adoption Qi/PMA Dual mode products are just starting to emerge
But Each Standard Has BenefitsFeature/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 A4WP coil size will scale with the power requirement
Power control IB IB BLE IB = In Band, potentially lower cost
Efficiency ++ ++ +
Freedom of placement + + ++ Tolerance for low coupling
Interoperability of different size coils / power levels
+ + ++ Tolerance for low coupling which accommodates mismatch in Rx/Tx sizes more easily
Charging continuity in presence metals
+ + ++ Sensitivity to metals causes FOD schemes to interrupt or prevent charging
Multiple device support No No Yes With a single Tx coil
Distance Charging + + ++ Low = ~ 5mm, High = ~35mm
Based on existing standards Qi 1.1.2, PMA 1.0, A4WP 1.2
Can We Bring Wireless Charging Under One Umbrella of Solutions?
What Makes These Standards Different?
Feature
Comms Protocols
Power Transfer • Induction vs. Resonance
Operating Frequency
Difference
This is just a language. The essential algorithm for power transfer is similar.
All systems are resonant, the difference is whether we choose to operate on-resonance (Rezence) or slightly off-resonance (Qi)
Qi/PMA are of similar frequencies, and A4WP is a very different frequency
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We Could Define The Ecosystem Based on Frequency
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Highly Resonant
HFTX
RX
Inductive LF
TX
RX
Operating Frequency Fence
100-300kHz
6.78 MHz
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 ΩRx Case…
MT3188 Multi Standard Module
▪ Device, MT3188 • In Mass Production
▪ Certification• WPC 1.1.2 Mar, 2014
• PMA 1.0 Dec, 2014
• A4WP 1.2 Feb, 2015
▪ Module Supplier• Various; contact MediaTek
55mm
73 mm
Considerations for Rx or Tx for Multimode Implementation
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▪ The A4WP standard is 1:many charging (Tx/Rx)
▪ The Qi standard has Tx options for multiple coils for 1:1 charging (Rx/Tx)• Rx: Simple coil design
• Tx: More complicated coil design
Rx Tx - 1:2
A4WP coil
Qi/PMA coils
To Date Companies are Moving Towards Rx Implentations
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▪ Companies have announced Rx solutions first including…
• MediaTek MT3188
• Broadcom BCM59350
• IDT P9700
▪ The infrastructure market is asking for multimode transmitters; none are announced
Summary
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▪ The diversity of Wireless-Power Ecosystems does not promote global adoption
▪ Technology can support Multi-Frequency solutions for both transmitters and receivers
▪ 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
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