原标题：ST STWBC支持Qi A11拓扑无线电池充电器发送方案

　　ST公司的STWBC是用于无线电池充电器发送器的数字控制器,支持Qi A11拓扑,提供最灵活和效率的解决方案,用来给无线充电器接收器发送的功率进行控制,支持5V 5W的功率,可以用于采用电磁线圈充电的手机,可穿戴和其它电池供电的设备.本文介绍了STWBC主要特性,框图和无线充电系统框图,以及评估板STEVAL-ISB027V1主要特性,框图,电路图,材料清单和PCB设计图.

　　Digital controller for wireless battery charger transmitters supporting Qi A11 topology The STWBC is the digital controller for wireless battery charger (WBC) transmitters (TX) from STMicroelectronics, offering the most flexible and efficient solution for controlling power transfer to a receiver (RX) in WBC-enabled applications such as phones, wearables,and other battery powered devices that use electromagnetic induction for recharging.

　　As a member of the Qi Wireless Power Consortium and the PMA (Power Matters Alliance),ST ensures full compatibility with these leading wireless charging protocols and holds certification for the Qi 1.1.2 A11 standard.

　　The STWBC performs all the functions for transmitter control: thanks to the internal 96 MHzclock and supporting both half-bridge and full bridge topologies, it is able to precisely controlthe amount of transmitted power to match the requirements of the receiving unit in terms ofmaximizing the efficiency of the power transfer.

　　The STWBC comes with firmware options to offer customers the ability to personalize theirend product without the need of external microcontrollers:

　　A turnkey Qi 1.1.2 A11 certified solution, fully interoperable with Qi enabled mobile phones.

　　API (application programming interface) access to customize the underlying firmware,for example modifying the behavior of the LEDs or GPIOs in response to the receiver behavior and supporting I²C and UART communication within a network.

　　The STWBC Qi 1.1.2 A11 certified solution is available in the STMicroelectronics STEVALISB027V1reference design, intended for all Qi compatible receivers such as in Qi enabledmobile phones.

　　In the reference design the STWBC integrates the foreign object detection (FOD): the digitalfeedback between TX and RX units allows the detection of metal objects close to thereceiver that could result in potential hazards, enabling the STWBC to stop power transmission when such objects are detected.

　　The reference design is offered together with a complete ecosystem to support customers inbuilding their applications, including the Qi 1.1.2 A11 certified board (STEVAL-ISB027V1),API libraries and documentation to develop software customizations, as well asa comprehensive graphical user interface to monitor real-time performance and diagnostics.

　　STWBC主要特性:

　　 Digital controller for wireless battery chargertransmitter

　　 Multiple Qi certified and PMA standardcompatible

　　 Support for up to 5 W applications

　　– Mobile

　　– Wearable, sports gear, medical

　　– Remote controllers

　　 Native support to half-bridge and full bridgetopologies

　　 5 V supply voltage

　　 2 firmware options

　　– Turnkey solution for quick design

　　– APIs available for applicationcustomization(a)

　　 Peripherals available via APIs(a)

　　– ADC with 10 bit precision and 1 M ohminputimpedance

　　– UART

　　– I2C master fast/slow speed rate

　　– GPIOs

　　 Memory

　　– Flash and E2PROM with read-while-write(RWW) and error correction code (ECC)

　　– Program memory: 32 KBytes Flash; dataretention 15 years at 85 ℃ after 10 kcycles at 25 ℃

　　– Data memory: 1 KByte true data E2PROM;data retention:15 years at 85 ℃ after 100 kcycles at 85 ℃

　　– RAM: 6 KBytes

　　 Reference design features

　　– 2 layers PCBs

　　– Active object detection

　　– Graphical user interface for applicationmonitoring

　　– Evaluation boards

　　 Operating temperature: -40℃ up to 105℃

　　 Package: VFQFPN32

　　STWBC应用:

　　 Certified Qi A11

　　– Evaluation board: STEVAL-ISB027V1

　　– Power rate: 5W

　　– Input: 5V

　　 Qi A13(a)

　　– Power rate: 5 W

　　– Input: 5 - 16 V, 12 V

　　 Wearable(a)

　　– Power rate: 2 W

　　– Input: 5 V

　　 PMA(a)

　　– power rate: 5 W

　　– input: 5 V

　　图1.STWBC器件架构图

　　图2.无线充电系统框图

　　评估板STEVAL-ISB027V1

　　Qi A11 wireless charger transmitter evaluation board based on STWBC

　　The following describes the operation of the STEVAL-ISB027V1 Qi A11 wireless power transmitter evaluation board. The STEVAL-ISB027V1 is a certified reference design based on the Qi A11 wireless power consortium (WPC) standard version 1.1.2, and supports FOD (foreign object detection).

　　The transmitter is compatible with all Qi-compatible receivers, such as those already available in Qi-enabled mobile phones. Receivers with both resistive or capacitive modulation are supported.

　　In accordance with the Qi A11 topology, the STEVAL-ISB027V1 supports a 5 V input and a full bridge stage with both frequency and duty cycle control. The STEVAL-ISB027V1 features the STWBC controller, which integrates all the functions required to drive and monitor the transmitter.

　　STWBC supports UART connectivity to a PC and thanks to the STEVAL-ISB027V1 graphical interface, it is possible to monitor the behavior of the transmitter in real-time. The STEVAL-ISB027V1 reference design provides a complete kit which includes the STWBC, firmware, layout, graphical interfaces and tools. The layout is based on a cost-effective 2-layer PCB.

　　This user manual explains the STEVAL-ISB027V1 hardware and software installation, as well as details on the evaluation of the board and the GUI interface.

　　图3.评估板STEVAL-ISB027V1外形图

　　评估板STEVAL-ISB027V1(无线发送板)主要特性:

　　 WPC Qi 1.1.2 certified

　　 Standard Qi A11-type transmitter and coil

　　 Resistive and capacitive modulation

　　 Foreign object detection (FOD)

　　 LEDs for charge status indication

　　 UART connection for user interface

　　 SWIM connection for firmware download

　　 5 V power supply

　　评估板STEVAL-ISB027V1主要电特性:

　　评估板STEVAL-ISB027V1材料清单: