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TSDMTX-5V2-EVM Datasheet(PDF) 3 Page - Semtech Corporation

Part # TSDMTX-5V2-EVM
Description  Wireless Charging Transmitter
Download  24 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

TSDMTX-5V2-EVM Datasheet(HTML) 3 Page - Semtech Corporation

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User Guide
2 of 23
TSDMTX-5V2-EVM
www.semtech.com
Rev1.0
Wireless Charging Concepts
Wireless power transfer is, essentially, a transformer. Power is provided to a primary coil which produces
an electromagnetic (EM) field. In this field, a secondary coil is placed. The EM field induces a current into
the secondary coil, providing power to whatever it is connected to.
However, unlike a conventional power transformer that operates at line frequencies and requires an iron
core for efficiency, wireless power systems are designed to operate in the 100 kHz range, and thus can
perform efficiently with an air core. As such, the primary and secondary windings, if closely spaced, can
be in separate devices, the primary being part of a transmitter and the secondary within a receiver. This
implementation can also be described as a radio broadcast process, and as such, these transformer coils
can also be seen as antennas with equal validity, and the two terms will be used interchangeably in this
text.
Receiver
Transmitter
Electromagnetic
Flux
Controller
FET Array
Power
Supply
Supply
Regulation
Rectifier
End
Equipment
Wireless power systems differ in another major aspect from conventional transformers, in that they are
intelligently managed. A transmitter will only provide power when a receiver is present, and only produce
the amount of power requested by the receiver. In addition, the system is capable of recognizing when
the electromagnetic field has been interrupted by an unintended element, a 'foreign object', and will shut
down the transfer to prevent any significant amount of power being absorbed by anything but a proper
receiver. The intelligent management of the wireless power transmission process is achieved though the
programming of the TS80000, which first searches for a receiver. Once found, the receiver informs the
transmitter of its power requirements, and transmission begins. The system then verifies the right amount
of power is being sent, and that none is being lost to foreign objects. The receiver will continually provide
ongoing requests for power to maintain the transaction. If the requests cease, the transaction terminates.
Via this protocol, even complex charging patterns can be supported, as the transmitter can provide
varying amounts of power at different times, as requested by the receiver. Should the receiver require no
further power, such as when a battery charge is completed, it can request no further power be sent, and
the transmitter will reduce its output accordingly.
Wireless power systems have been broken into three basic power categories. “Wearable” devices, such
as headsets, wrist-band devices, medical sensors, and so forth - all operate in the low power range, up to
5 watts. Medium power devices, in the 5- to 15-watt range, include most handheld devices, such as cell
phones, tablets, and medical electronics. High power wireless systems are intended to support devices
such as power tools, radio controlled (“RC”) devices such as drones, and other equipment requiring 15 to
100 watts of power.


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