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Wireless Power Design Kit – Medium Power – 760308MP V1.0

Design Kit Manual

EUDC59-U-004 - Rev. 1.0

1. Introduction

WPC's Qi standard for medium power has attracted attention as a next-generation standard for inductive power transmission that

will enable wireless charging of tablet PCs while allowing smartphones and other mobile devices to be charged up to three times

faster than the existing low power standard (5W). In addition, an advanced Foreign Object Detection (FOD) function is included to

provide improved safety by detecting foreign metallic right before the power transfer has started to ensure the safety of sensitive

electronics and to avoid overheating of foreign metallic objects.

ROHM has developed this design kit to enable engineers to faster develop wireless charging in general and explore the detailed

usage of its core components on the transmitter side with the BD57020MWV and on the receiver side with the BD57015GWL.

This manual is valid for Design Kit Version 1.0. It provides guidelines to quickly setup the hardware for fast and easy evaluation of

the wireless charging system and the featured key components. For further details and updates about the TX and RX ICs and other

ROHM products, please also consult the relevant product datasheets and general information at http://www.rohm.com.

Please also check www.rohm.com/web/eu/wirelesspowerkit for downloading the latest version of this document and additional

useful information such as application notes, Gerber files, schematics, bill of materials, etc.

2. Hardware Description

2.1 Block Diagram

The design kit consists of the following components:

 TX Module Demonstration of charging pad function using TX IC, MCU, discrete full bridge, QFOD circuit, TX coil

 RX Module Demonstration of wireless power receiver inside a mobile device using Receiver IC, RX coil

 LED Shield Wireless powered LED light using LED array + driver, MCU

 Power Supply Wide input range mains power supply with different adapters for international use

A block diagram of the design kit is depicted in Figure 1. The transmitter design corresponds to the MP-A7 as defined in the WPC Qi

specification 1.2.2. The necessary 19V

input voltage is provided with the included mains adapter.

The key component of the Transmitter Module is the transmitter IC BD57020MWV. This IC integrates all necessary analog functions

to operate as a wireless power transmitter such as full bridge pre-driver and demodulation circuit. The digital control is realized by

the microcontroller ML610Q772-B03 which is directly supplied by one of the LDO outputs of the TX IC. The quality factor foreign

object detection (Q-FOD) circuit is realized with discrete components.

The coil area is the wireless power interface to the receiver. It is covered by a 2mm thick acryl glass plate which acts as distance

spacer and physical protection of the resonant circuit which may carry high AC voltages in certain conditions.

Figure 1: Design Kit Block Diagram

The Receiver Module integrates all necessary functions to act as a wireless power receiver such as full synchronous rectification,

power sensing, modulator, Qi/PMA packet controller and an adjustable output LDO. The key component is the BD57015GWL

receiver IC.