Wireless Power

Eval Platform for Testing and Experimentation of a Wireless Charging Transmitter

The Semtech TSDMTX-19V3-EVM is an evaluation platform for test and experimentation of a wireless charging transmitter based on the Semtech TS80003 wireless power transmitter controller, TS61002 FET driver, TS30011 dc-dc converter, and TS94033 current-sense amplifier.

This evaluation module provides a complete system solution and is compatible with the major industry standards of power transmission, making this transmitter an ideal platform for powering the majority of wireless receivers in use today.

The TSDMTX-19V3-EVM Evaluation Module is a ready-to-use demonstration platform allowing testing of up to 15 Watts of wireless power transmission compliant with the dominant industry standard. This evaluation module provides a complete system solution and is compatible with the Wireless Power Consortium (WPC) or Qi standards of power transmission, making this transmitter an ideal platform for powering the majority of wireless receivers in use today.

The transmitter may be coupled with any receiver module to form a complete wireless power transmission system. For the system designer, a likely choice might be the complementary Semtech TSDMRX-19V/20W-EVM, which can allow a variety of experiments to easily be performed in order to learn more about the behavior of the system.

There are a number of other Semtech Receiver EVMs that support different power levels and output voltages, any of which can be used as they are compatible with the major industry standards and therefore are compatible with the TSDMTX-19V3-EVM transmitter.

Features

  • 19V Input / up to 20W Output Power
  • Compatible with the major industry standards
  • Supports faster charging

The TSDMTX‐19V3‐EVM is easy to set up and use. Use the power supply module and line cord that comes with the EVM kit to apply power to the EVM via “J2”, the 19V power input jack. The acceptable input voltage range is from 16V to 21V. Once input power is provided, the green LED should light for about a half‐second and then turn off.

At this point, the EVM is ready to transmit power. A few times each second, the transmitter emits a ‘ping’ of energy in search of a compliant receiver in range.

When receiver is in range (usually 4mm~6mm), the receiver is powered sufficiently during the ping‐phase and is able to announce its presence to the transmitter, and a transaction begins. The transmitter provides a small amount of power to the newly discovered receiver, so receiver can tell the transmitter what its power requirements are.

At the completion of the handshake, the transmitter begins providing the requested power, indicated by

blinking green LED. During power transfer, the receiver continuously communicates with the transmitter, actively directing the process. In this way, it is assured that power is only sent by how much it is required by an available and desirous receiver – and in the way that is compatible to the requirements of the receiver. If required, a receiver can actively increase or decrease its power request, and the transmitter will act accordingly. As such, equipment with complex charging requirements can be precisely supported and only the desired amount of power is provided.

Once charging is completed, the LED stops blinking and displays a steady green ‘completed’ state. If at any time an error is detected, the red LED is lit and transmission is halted. To restart, the receiver must be removed from the range of the transmitter and put back to the target zone to start a new transaction.

Semtech Corp.
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