原标题：Freescale WCT1000 5W单线圈无线充电器参考设计

　　freescale公司的WCT1000是无线电源发送器控制器,集成了WPC Qi兼容的无线电源发送设计所需的所有功能,是低功率5W解决方案.单电源输入4.2V起,典型值为5V,12V和19V,采用Freescale Touch技术得到超低待机功耗,低于25mW.本文介绍了WCT1000主要特性, 无线充电系统功能框图, WCT1000功能框图, 无线发送系统设计案例电路图以及单线圈无线充电器参考设计WCT-5W1COILTX主要特性和优势,框图,电路图和材料清单.

　　The WCT1000 is a wireless power transmitter controller that integrates all required functions for WPC “Qi” compliant wireless power transmitter design. It’s an intelligent device to work with Freescale touch sensing technology or use periodically analog PING (configurable by user) to detect a mobile device for charging while gaining super low standby power. Once the mobile device is detected, the WCT1000 controls the power transfer by adjusting operation frequency of power stage according to message packets sent by mobile device.

　　In order to maximize the design freedom and product differentiation, WCT1000 supports any low power guided positioning single coil power transmitter design (WPC types or customization) using operation frequency and duty cycle control by software based solutions. Besides, easy-to-use FreeMASTER GUI tool with configuration, calibration and debugging functions provides user-friendly design experience and speed time-to-market.

　　The WCT1000 includes digital demodulation module to reduce external components, over-voltage/current/ temperature protection and FOD method to protect from overheating by misplaced metallic foreign objects. It also handles any abnormal condition and operational status, and provides comprehensive indicator outputs for robust system design.

　　WCT1000主要特性:

　　 Low power (5 W) solution for Wireless Power Consortium (WPC) compliant transmitter design

　　 Conforms to the latest version low power WPC specifications

　　 Supports wide DC input voltage range starting from 4.2 V, typically 5 V, 12 V and 19 V

　　 Integrated digital demodulation on chip

　　 Supports all types of receiver modulation strategies (AC capacitor, AC resistor and DC resistor)

　　 Supports Foreign Object Detection (FOD)

　　 Dynamic input power limit for limited input power supply, like USB power.

　　 Super low standby power (less than 25 mW) by Freescale Touch technology

　　 Supports any guided positioning single coil power transmitter solutions using frequency and duty cycle control

　　 LED & buzzer for system status indication

　　 Over-voltage/current/temperature protection

　　 Software based solution to provide maximum design freedom and product differentiation

　　 FreeMASTER GUI tool to enable configuration, calibration and debugging

　　WCT1000应用:

　　 Low Power Wireless Power Transmitter

　　Any guided positioning single coil solution with frequency & duty cycle control (WPC A types or customer properties)

　　图1.无线充电系统功能框图

　　图2. WCT1000功能框图

　　单线圈无线充电器参考设计WCT-5W1COILTX

　　This document describes how to use the 5 W low power wireless charger transmitter WCT_A11 reference board designed by Freescale. The A11 Reference solution is compliant with the WPC Qi V1.1 specification. It is a low cost reference solution which can be easily customized through the FreeMASTER GUI tool.

　　The 5 watt single-coil wireless charging transmitter reference design uses Freescale’s MWCT1000 transmit controller IC to manage and perform all control functions necessary to implement a wireless charging transmitter solution. This solution is highly optimized to provide the lowest bill-of-materials cost, as well as highest performance. The design complies with the Wireless Power Consortium’s latest Qi specification and is certified as a WPC-A11 transmitter type. Among the many features of this design, the solution has been developed to provide a more general solution which operates with many different coil types.

　　参考设计WCT-5W1COILTX主要特性:

　　Certified as WPC-A11 transmitter type

　　Greater than 75% transfer efficiency

　　Transmit IC consumes less than 30mA in active Run mode

　　On-chip digital demodulation

　　30mW standby power using proximity sensing

　　Robust foreign object detection algorithm

　　Ultra-low Bill-of-Materials cost

　　Support for current limited devices such as PCs

　　Supports any 5 watt single-coil application that uses 5 volt input source

　　参考设计WCT-5W1COILTX目标应用:

　　• 5 W single-coil wireless charging applications

　　• Mobile phone chargers

　　• Point-of-sale terminals

　　• Handheld medical devices

　　• Mobile phone accessories such as battery banks and active phone sleeves

　　• PC accessories, including keyboards and mice

　　图3.WCT A11参考板外形图

　　图4.WCT A11参考板框图

　　参考设计WCT-5W1COILTX特性和优势:

　　图5.WCT A11参考板主要元件分布图