Semtech TSDMRX-19V20W-EVM Manuel utilisateur
TSDMRX-19V20W-EVM
Wireless Charging Receiver
www.semtech.com
WIRELESS CHARGING
LinkCharge™ 20 Series
User Guide
TSDMRX-19V20W-EVM
Wireless Charging
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Introduction
The Semtech TSDMRX-19V20W-EVM is an evaluation platform for test an experimentation of a wireless charging
receiver base on a suite of high efficiency Semtech ICs: the TS81000 Receiver Controller for Wireless Power
Systems, TS94033 current sense amplifier IC, an the TS30042 Current-Mo e Synchronous Buck DC/DC Converter.
This evaluation mo ule provi es a complete system solution for in uctive stan ar of wireless power transfer,
making this receiver an i eal platform compatible with the majority of wireless power systems in use to ay.
Please visit www.semtech.com to download the latest EVM software for your evaluation board.
Objectives
The objective of this User Gui e is to provi e a fast, easy an thorough metho to experiment with an evaluate
the Semtech solutions for wireless charging systems. Sufficient information is provi e to support the engineer in
all aspects of a ing wireless charging support to their pro ucts. Semtech offers a range of solutions to meet the
nee s of a wi e range of system evelopers. Developers are provi e with all the information on how this EVM
was built as a starting point for their own esigns using the TS81000 an other Semtech components.
Table of Contents
Wireless Charging Concepts ........................................................................................................................2
Product Description .....................................................................................................................................3
Standard Use ...............................................................................................................................................4
Documentation ............................................................................................................................................7
A.
Block Diagram ................................................................................................................................7
B.
Schematic .......................................................................................................................................8
C.
Bill Of Materials “BOM” ...............................................................................................................12
D.
Boar Layout ................................................................................................................................13
E.
Boar Layers .................................................................................................................................14
FAQs .......................................................................................................................................................... 5
Next Steps .................................................................................................................................................. 6
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Wireless Charging Concepts
Wireless power transfer is, essentially, a transformer. Power is provi e to a primary coil which pro uces an
electromagnetic (EM) fiel . In this fiel , a secon ary coil is place . The EM fiel in uces a current into the
secon ary coil, provi ing power to whatever it is connecte to.
However, unlike a conventional power transformer that operates at line frequencies an requires an iron core for
efficiency, wireless power systems are esigne to operate in the 100 kHz range, an thus can perform efficiently
with an air core. As such, the primary an secon ary win ings, if closely space , can be in separate evices, the
primary being part of a transmitter an the secon ary within a receiver. This implementation can also be escribe
as a ra io broa cast process, an as such, these transformer coils can also be seen as antennas with equal vali ity,
an the two terms will be use interchangeably in this text.
Receiver
Transmitter
Control
Electromagnetic
Flux
Controller FETArray
Power
Supply
Supply
Regulation Rectifier
End
Equipment
Power
Wireless power systems iffer in another major aspect from conventional transformers, in that they are
intelligently manage . A transmitter will only provi e power when a receiver is present, an only pro uce the
amount of power requeste by the receiver. In a ition, the system is capable of recognizing when the
electromagnetic fiel has been interrupte by an uninten e element, a 'foreign object', an will shut own the
transfer to prevent any significant amount of power being absorbe by anything but a proper receiver. The
intelligent management of the wireless power transmission process is achieve though the programming of the
TS81000. When intro uce to a compliant transmitter, the TSDMRX-19V20W-EVM receiver informs the
transmitter of its power requirements, an transmission begins. The receiver then verifies the right amount of
power is being sent, an that none is being lost to foreign objects. The receiver continually provi es ongoing
requests for power to maintain the transaction. If these requests cease, the transaction terminates. Via this
protocol, even complex charging patterns can be supporte , as the transmitter can provi e varying amounts of
power at ifferent times, as requeste by the TSDMRX-19V20W-EVM. Shoul the TSDMRX-19V20W-EVM require
no further power, such as when a battery charge is complete , it can request no further power be sent, an the
transmitter will re uce its output accor ingly.
Wireless power systems have been broken into three basic power categories. “Wearable” evices, such as
hea sets, wrist-ban evices, me ical sensors, an so forth - all operate in the low power range, up to 5 watts.
Me ium power evices, in the 5- to 15-watt range, inclu e most han hel evices, such as cell phones, tablets,
an me ical electronics. High power wireless systems are inten e to support evices such as power tools, ra io
controlle (“RC”) evices such as rones, an other equipment requiring 15 to 100 watts of power.
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Product Description
The TSDMRX-19V20W-EVM Evaluation Mo ule is a rea y-to-use emonstration platform allowing testing of up to
20 watts of wireless power transmission using a proprietary communication protocol as well as backwar
compatiblity with the in ustry in uctive stan ar to charge evices at 15W or below. For 20 watts operation, the
transimitter must be be paire with Semtech’s Transmitter TSDMTX-1 V2-EVM (firmware version should be 00.75
or newer), which can allow a variety of experiments to easily be performe in or er to learn more about the
behavior of the system.
To evelop your own boar , or integrate this functionality into an existing system, the EVM can be use as a
starting point for the esign, as it emonstrates a working mo el from which to procee . Towar this en , all
ocumentation for the EVM is provi e to make the process as efficient as possible.
The key technology components of the EVM are a trio of Semtech integrate circuits, the TS81000, TS94033, an
TS30042. The TS81000 provi es the Qi compliant communications an control for wireless receivers of up to 40+
watts. All the intelligent management of the process is han le by the TS81000. Up to 20+ watts of power acquire
from the receiver antenna is recifie , converte to DC, an output at ~ 21VDC. TS94033, sense the DC current an
fee back to TS81000, the TS30042 is the final part of the process, where the output of the rectification is
converte to 19VDC for output to the system loa . This EVM presents a working example of how these three
components can be use together to form a complete wireless power receiver solution with high efficiency, low
part count an minimize space requirements.
As seen in the photo below, at the left is antenna lea s an the right port can be use to provi e output power to
a evice. In a 31x16mm portion of the boar is the receiver, in icating the size of the actual receiver system. Right
own elow is the connector for programming. Some will be employe in the following text; all are ocumente
in the schematic iagram below.
In the following section, an intro uction will be provi e to the evaluator for how to use the EVM for wireless
power reception as well as how the TSDMTX-19V2-EVM can be use in conjunction with.
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Standard Use
The TSDMRX-19V20W-EVM is very easy to use. Start by applying power to the TSDMTX-19V2-EVM transmitter. A
few times each secon , the transmitter emits a ‘ping’ of energy in search of a compliant receiver in range - in this
ocument, the TSDMRX-19V20W-EVM.
Place the TSDMRX-19V20W-EVM over the target area of the transmitter EVM. The TSDMRX-19V20W-EVM is
initially powere by the ping sufficiently to be able to announce its presence to the transmitter, an a transaction
begins. The transmitter next provi es a small amount of power to the newly iscovere receiver, so the TSDMRX-
19V20W-EVM can tell the transmitter what its power requirements are.
At the completion of this han shake, the transmitter begins provi ing the requeste power, in icate by a green
LED on the receiver EVM. During power transfer, the TSDMRX-19V20W-EVM continuously communicates with the
transmitter, actively irecting the process. In this way, it is assure that power is only sent when an how it is
require by the receiver. If require by the loa , the TSDMRX-19V20W-EVM can actively increase or ecrease its
power request, an the transmitter will act accor ingly. As such, equipment with complex charging requirements
can be precisely supporte by the TSDMRX-19V20W-EVM an only the esire amount of power is provi e . If at
any time an error is etecte , transmission is halte . To restart, the TSDMRX-19V20W-EVM must be remove from
the range of the transmitter an returne to the target zone to start a new transaction.
The receiver EVM can eliver up to 20 watts of power at 19 volts to any loa the user woul like to experiment
with. For general experimentation, the optimal loa to select woul be a Programmable DC Electronic Loa . A
‘loa box’ can easily be set to raw a selecte current or power at the turn of a knob, making them very flexible
an easy to use in observing power supply operation in general. If a loa box is not available, a power resistor
eca e box is nearly as convenient, as it can easily be set to any esire resistance to simulate a range of loa
con itions. In either case, be sure the test loa is rate for at least the amount of power being teste .
Run wires from the VOUT+ an - pins of the receiver EVM to the selecte test loa , as per the illustration below.
Once the loa is a e , the receiver EVM can be use to perform a variety of tests.
Note: In-ban communication between the RX an the TX is one using loa mo ulation. At light loa s a minimum
loa is generate using R15, but that may not be enough to maintain optimal communication. An external load of
100-200mA is necessary to prevent communication dropouts.
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Connect a DC voltmeter across the VOUT+ an - pins to monitor the voltage being output to the loa , an a DC
ammeter in series with the VOUT+ line. Set levels to allow for up to 20 volts an 1.5 amps to be observe .
With no loa selecte , place the receiver on the center of the transmitter target circle. Once transmission begins,
you shoul observe approximately 19 volts an 0 amperes on the meters.
Apply a variety of loa s to observe performance at 20 watt levels. Voltage shoul remain nearly constant, an
current shoul follow the P=V*I relationship. Experiment with the maximum power that can be rawn before the
receiver etects an overloa an cuts off power. You shoul be able to observe on a minor overloa , the receiver
will attempt to restore power by retesting the loa intermittently. In the case of a major overloa , the transmitter
may register an error, as in icate by a re LED on the transmitter, which will halt further activity until the receiver
is remove from the target area for several secon s before being returne to start a new transaction.
Observe Coil Signals
The following information is not require in or er to use the EVM, as what can be observe below is entirely
manage by the Semtech TS81000 Wireless Controller. However, it allows the observer an opportunity to see how
the receiver an transmitter actively manage the wireless power process.
If you wish to observe the intrinsic wireless process, place an oscilloscope probe on the antenna lea s, with the
probe groun run to the boar groun . Be sure the scope can han le signals up to 200 volts. While the EVM power
output is only 19 volts, the antenna is part of a resonant circuit where consi erably higher voltages are evelope .
Place the receiver on the transmitter target. With the scope set to 0.5 to 1 uSec an 10 to 20 volts per ivision, you
shoul observe a signal that is a composite of the sinusoi al power signal with a igital ‘notch’ in the sinewave
which is pro uce by the communication between the receiver an transmitter. Note as you vary the loa an the
location of the receiver on the target that the amplitu e an frequency of the coil signal changes. The greater the
loa , the more signal is sent to transfer the power require by the loa . Similarly, the less well couple the
receiver antenna is to the transmitter coil, the more power must be sent to compensate for the inefficient
misalignment.
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Measure Efficiency
By measuring the power from the receiver’s VOUT+ an - pins in comparison to the power entering the transmitter
EVM, you can etermine the efficiency of the power transfer through the system. For the EVMs use
here(TSDMRX-19V20W-EVM on TSDMTX-19V2-EVM), the iagram below emonstrates that efficiency is a function
of output current, an runs about 85% at higher power levels, assuring goo efficiency an minimal heat
issipation concerns.
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Documentation
The following sections ocument the har ware esign of the TSDMRX-19V20W-EVM. This information can be use
to better un erstan the functionality of the esign, as well as assist in creating your own har ware solution base
on this esign.
A. Block Diagram
The TSDMRX-19V20W-EVM may be ivi e into a number of sub-blocks as show in the iagram:
Antenna: Transmit – power source riving the receiver EVM (in this ocument: part of the TSDMTX-19V2-EVM).
Antenna: Receive – coil of wire place in proximity to the transmit antenna to power the EVM receiver system.
Also inclu es zero-crossing etection an over-voltage protection circuitry.
Rectification&Modulation – full wave Rectifier Bri ge.
Current Sense – low power low offset current sense aplifier IC base on the TS94033.
Controller – base on the TS81000 High Efficiency Receiver Controller for Wireless Power Systems. The TS81000
collects voltage, current, an temperature fee back signals from the receiver system, controls the actions.
DC/DC Converter – base on the TS30042 Switching frequencies 1MHz, 2A Current-Mo e Synchronous Buck
DC/DC Converter, which converts 19VDC at up to 1.1 amperes for use by the user-selecte user of the receive
power.
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B. Schematic
Below are two copies of the schematic. The first, annotation has been a e to in icate which part of the block
iagram each component is a member of. The secon will allow better use in print-out form, as the lan scape
orientation allows a larger image to be provi e .
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Table des matières
Autres manuels Semtech Récepteur
