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Wireless Power – Ready for Prime Time
Jeff Gao – Senior FAE
Tech Shanghai
16th March, 2016
© 2016, IDT
Wireless Power – Ready For Prime Time
Abstract:
For many, 2015 marked the ‘tipping point’ for wireless power with major announcements
from several key smartphone and infrastructure providers.
This paper explores the reasons behind the adoption of wireless power, after more than
one hundred years in the wilderness, reviews some of the wireless power technology
trends and standards and looks to the next phase of enabling mass market adoption.
Content:
•Wireless Power Introduction
•Market Trends
•‘Crossing the Chasm’
•Wireless Power for the Mass Market
© 2016, IDT
Wireless Power Introduction
• An alternating current in the
transmitter coil generates a
magnetic field which induces a
voltage in the receiver coil.
• This voltage can be used to
power a mobile device or
charge a battery
Reference: Wireless Power Consortium
• Best energy transfer when the coils are similar size and
tightly coupled with small separation
© 2016, IDT
WPC Wireless Power System
Transmitter
Transmitter (Tx)
• Power Conversion Unit:
DC-to-AC Conversion
• Adapts Power Transfer
– To the need of the receiver
– To a required operating point
• Receives Messages
– Via communication Packets
– By de-modulation of the reflected
load
Receiver
Receiver (Rx)
• Power Receive Unit:
AC-to-DC Conversion
• Controls Received Power
– To the need of the mobile device
– To the desired operating point
• Sends Messages
– Via communication packets
– By load modulation on the power signal
© 2016, IDT
MI vs. MR Comparison
There are advantages and disadvantages to each…
•
•
Inductive solutions are more efficient when displacement is minimal
Standardization and development efforts occurring around both technologies
In Mass
Production Today
Close Coupling
Spatial Freedom
Magnetic Technologies
Induction
Resonance
Magnetic Field
Shielded
Open
100-205kHz
Fixed 6.78MHz
<5mm
Inches
1:1 Charge
1:Multi-Charge
70-75%
TBD
15W Today
3-10W Today
Frequency Range
Coupling
Tx : Rx
Efficiency
Power Transfer
© 2016, IDT
Wireless Power Standards
• WPC Qi (MI) gaining greater traction
• >50MU shipped
• Large Smartphone Wins
• A4WP (MR):
• Multi-device charging and spatial freedom
• Larger size, lower efficiency, increased cost? EMI?
• PMA(MI) and A4WP(MR) agreement to merge
© 2016, IDT
Wireless Power Market Trends
•
•
•
•
•
2015 seen as industry Tipping Point
with new products from Samsung,
Apple and IKEA
Cellphone drives the infrastructure
MI solutions will dominate next 2-3
years, at least
Wireless Power Consortium Release 1.2 with Extended Power
Profile (EPP)
A4WP and PMA officially merged in
June 2015 to form AirfuelTM Alliance
IHS Wireless Power Report 2015
© 2016, IDT
Wireless Power:
Crossing the Chasm
Mass Market
Adoption
APPLICATION ISSUES SOLVED
●Convenience
●Eliminates
●Allows
- Better user experience
contact corrosion
for waterproofing / dustproofing
●Eliminates
●Alleviates
connector reliability issues
form-factor constraints
Value / Cost
Efficiency
Size
Standards
Easy To Use
© 2016, IDT
Reaching the Mass Market
• ‘Ready-to-go’ kit in compact form factor
• Easy import to customer design
• Extensive support collateral
© 2016, IDT
Ease of Use – Development Kits
Turnkey 5 W
Wireless Power
Transmitter and
Receiver Solution
•
•
•
Fast prototyping
Simplified design
integration
Proven, Qi-compliant
solution
© 2016, IDT
Ease of Use – Development Kits
Turnkey 5 W
Wireless Power
Transmitter and
Receiver Solution
•
•
•
Fast prototyping
Simplified design
integration
Proven, Qi-compliant
solution
© 2016, IDT
Turnkey 5 W
Wireless Power
Transmitter and
Receiver Solution
Kits arrived
5:00 pm
•
•
•
Fast prototyping
Simplified design
integration
Proven, Qi-compliant
solution
By 8:05 it was
converted in
and sealed
© 2016, IDT
Reference Kit for the Mass Market
“The Product”
Easy to design-in and highly-accessible
5 Watt Qi-compliant wireless power
solution (Tx & Rx).
P9038-R-EVK
P9025AC-R-EVK
54mm
34mm
•Fast prototyping
- Plug-and-play functionality
- Compact form factor
29mm
84mm (total)
+
Datasheets
Board user guides
Schematics
Layout import files
Gerber files
BOM and direct-purchase links
Board start-up / how-to videos
Layout import video
Layout guide app note
•Seamless design integration
- Extensive documentation
- Layout import files
- FOD tuning guide
The only wireless power solution with
comprehensive design-in collateral and
a fully-optimized reference layout that
can be easily ported to any board.
13
17mm
68mm (total)
FOD tuning guide app note
FOD tuning calculator (Excel)
FOD tuning guide how-to video
Ref solution marketing video
Ref solution product brief
Device (IC) marketing videos
Kits available at disti
Entire BOM available at disti
Availability
Available NOW
URL:
www.idt.com/go/WPkits
© 2016, IDT
P9038-R-EVK Features & Benefits
Score line for coil separation
High-efficiency coil w/ spacer
Non-circuit thermal
dissipation area
Easy-access
power input
(optional)
Micro-USB
input
LED status
indicators
Easy-access I/O
connection points
VIN
GND
USB
FET
Micro
USB
IO6
IO5
IO4
P9038
D1
D3
IO3
IO0 RESET
IO2 SDA
/EN SCL
GND1 WP
EEPROM
LDO5V
Non-circuit thermal
dissipation area
Features
Benefits
Integrated power stage
Low BOM cost, small PCB area, low mfg. costs
Proprietary slew rate control
Low EMI, up to -10 dB below CISPR specification
2-layer PCB reference layout
Low cost, easily ported to system board
High efficiency
Low thermal dissipation
Input in-rush control
Prevents surges with inexpensive USB/standard adaptors
Fully-functional reference board
Fast prototyping
Extensive support collateral
Eases design-in effort for faster time-to-market
14
© 2016, IDT
P9025AC-R-EVK Features & Benefits
High-efficiency coil, face-down
(uses PCB as spacer)
Score line for coil separation
SCL I2CRAIL
SDA TEOP
/EN
CHG_END
Non-circuit thermal
dissipation area
Easy-access I/O
connection points
GND
GND1
VRECT
OUT
INT STAT
P9025AC
Features
Benefits
Single-chip solution
Low BOM cost, small PCB area, low mfg. costs
Programmable FOD
Provides flexibility for various applications
Qi-compatible (WPC 1.1.2)
Enables widespread interoperability
Optimized PCB reference layout
Low cost, easily ported to system board
Fully-functional reference board
Plug-and-play prototyping
Extensive support collateral
Eases design-in effort for faster time-to-market
15
Easy-access
power output
LED power
indicator
Non-circuit thermal
dissipation area
© 2016, IDT
Drop-in Layout Module
• Layout import file facilitates “drop-in” to system board – no tweaking necessary
• All inputs and outputs have been placed around edges for easy integration
• Special layout needs/issues will be referred to a third-party support team
Drop-in layout
Other
Circuitry
IDT Tx Reference Board
Customer’s System Board
16
© 2016, IDT
Foreign Object Detection (FOD) Primer
Reported Power
(Measured by Rx)
Power Delivered
(Measured by Tx)
I f Delivered - Reported > 350m W ,
then an FOD event has occurred
© 2016, IDT
Foreign Object Detection Setting
• Changes in Received-Transmit Power caused by
‘ambient’ conditions can be tuned out
• P9025AC receiver has flexible FOD trims implement
© 2016, IDT
Step-by-step FOD Tuning Guide
• Boards are factory tuned for Qi compliance, and can be used AS IS
• FOD tuning guide provides instruction and Excel tool for making
adjustments on the bench with resistors
• Custom/precision profiles to be supported by third-party
User inputs basic voltage and
current measurements
Spreadsheet calculates best
FOD bank selection and offset
resistor values
19
© 2016, IDT
P9038-R
Qi Wireless Power Tx with Integrated Inverter
Features:
EN
EN
IDTP9038
CBST2
BST2
COUT_T1
IN
SW2
ISNSN_IN
BST1
SW1
ISNSP_IN
LCTX
CBST1
CHPF
HPF
GATE
LDO5V
ADAPTOR
VBUS_SNS
ISNS_V
ISNS_V
LDO2P5V_IN
CLDO5V
SDA
PGND
OVP_SEL
REFGND
CLDO2P5V
GPIO6
GPIO5
GPIO4
GPIO3
GPIO2
GPIO1
GPIO0
Status
Production release
Availability
Samples and EVK now
Production
Now
Proprietary slew rate control
 Eliminates the need for EMI filter
Input Source Voltage Flexibility
LDO2P5V
RESET
SCL
SDA
LDO5V
INV5V_IN
VFOD_SNS
RESET
SCL
 Minimizes real estate & BOM cost
 Very low RDS(ON) offering high efficiency
ISNS
REG_IN
VIN Range: 4.5 – 6.9V
Supports up to 8W (RX) power transfer – 1.6A
Integrated Power Stage
GPIO6
GPIO5
GPIO4
GPIO3
GPIO2
GPIO1
GPIO0
 USB or AC Adaptor
Programmable input in-rush control
 Supports both USB and AC Adaptor
 Prevents surges with low cost adaptors
Integrated current sense & FOD amplifier
Input Over-Voltage Protection
WPC-1.1 compliant
Proprietary backchannel communication
Over-current protection
Available in VFQFN- 7m X 7m 56 pin
-40 to +85°C temperature range
© 2016, IDT
P9025AC-R
Qi Wireless Power Rx with LDO Output
Features:
Fully integrated single chip wireless
power receiver
6W output Power
BST1
P9025AC
CBST1
CCLAMP1
CS
LRX
C MOD1
5V OUTPUT
OUT
CLAMP1
Output Voltage up to
SNS
TQFN only
ACM1
AC1
C OUT
Rlim
ILIM
CD
CMOD2
CCLAMP2
CBST2
AC2
R1
STAT
ACM2
RFOD1
CLAMP2
FOD1
FOD2
BST2
TEOP
R FOD2
VDD
Interupt
INT
Chip Enable
EN
Temperature
Control
C1
VRECT
C RECT
Charge Complete
SCL
CHG_END/CS100
AGND
SDA
PGND
Status
Production release
Availability
Samples and EVK now
Production
Now
Integrated tracking LDO
SCL
SDA
5.5V
77% Peak System Level Efficiency
WPC-1.1.2 Compliance
Integrated synchronous full bridge rectifier
Power good status pin
Programmable current limit
 Lower power settings
Active low enable function
I2C interface – read back
 Die temperature, VREC voltage, resonance frequency,
Available in WLCSP 3X3mm – 36 & QFN5X5-32 packages
Safety Features:
 Foreign Object Detection [FOD]
 Under voltage lockout – UVLO
 Over temperature/Current/ Voltage protection
© 2016, IDT
Key Applications and Customer Needs
KEY APPLICATIONS
●PC
peripherals
●Small
appliances
●Rugged
electronic gear
●Furniture
APPLICATION ISSUES SOLVED
●Eliminates
●Allows
for waterproofing / dust-proofing
●Eliminates
●Alleviates
●Better
contact corrosion
connector reliability issues
form-factor constraints
user experience
22
© 2016, IDT
Wireless Power – Ready For Primetime
• 2015 tipping point for wireless power
• Infrastructure driven by cellphone manufacturers
• Wireless Power ready to ‘Cross the Chasm’
• Enable small to medium mass market companies with
‘Ready-to-Go’ EVK accompanied by collateral
23
© 2016, IDT
Thank You!
Questions…
© 2016, IDT