原标题：TI bq51025 WPC Qi协议10W无线电源接收解决方案

　　TI公司的bq51025是基于 WPC Qi协议的完整的无线电源接收器,提供单个器件电源转换(整流和稳压)以及基于WPC v1.1标准的数字控制和通信,10W时的系统效率84%,可调输出电压44.5V-10V,主要用在智能手机,平板电脑和手持设备,POS设备,充电宝和其它手持设备.本文介绍了bq51025主要特性,框图, 应用电路框图, 采用 bq51025的无线电源系统框图,以及无线电源接收评估板bq51025EVM-649 (PWR649)主要特性,电路图,材料清单和PCB元件布局图.

　　The bq51025 device is a fully-contained wireless power receiver capable of operating in the wireless Power Consortium (WPC) Qi protocol, which allows a wireless power system to deliver 5-W to the system with Qi inductive transmitters and up to 10-W when operating with the bq500215 primary-side controller. The bq51025 device provides a single device power conversion (rectification and regulation) as well as the digital control and communication as per WPC v1.1 specification. With market-leading 84% system efficiency and adjustable output voltage, the bq51025 device allows for unparalleled system optimization. With a maximum output voltage of 10-V, the bq51025 offers a flexible solution that allows optimal thermal performance of the system. The I2C interface allows system designers to implement interesting new features such as aligning a receiver on the transmitter surface, or detecting foreign objects on the receiver. The bq51025 device complies with the WPC v1.1 communication protocol making it compatible with all WPC transmitter solutions. The receiver allows for synchronous rectification, regulation and control, and communication to all exist in a market-leading form factor, efficiency, and solution size.

　　bq51025主要特性:

　　Robust 10-W Receiver Solution Using Proprietary

　　Protocol With TI&3146;s 10-W bq500215 Transmitter

　　Post-Regulation LDO to Protect External Charger

　　Input from Rectifier Output Transients; Inductorless Solution for Lowest Height

　　Adjustable Output Voltage (4.5-V to 10-V) for Coil and Thermal Optimization

　　Fully Synchronous Rectifier With 96% Efficiency

　　97% Efficient Post Regulator

　　84% System Efficiency at 10-W

　　WPC v1.1 Compliant Communication and Control for Compatibility With Current TX Solutions

　　Patented Transmitter Pad Detect Function Improves

　　User Experience

　　Power Signal Frequency Measurement Allows Host to

　　Determine Optimal Placement on TX Surface

　　I2C Communication With Host

　　bq51025应用:

　　Smart Phones, Tablets, and Headsets

　　Point-Of-Sale Devices

　　Power Banks

　　Other Portable Devices

　　图1. bq51025框图

　　图2. bq51025应用电路框图

　　图3.采用 bq51025的无线电源系统框图

　　图4. bq51025应用电路:WPC v1.1电源-输出7V/1.4A,I2C

　　图5. bq51025嵌入系统板电路

　　无线电源接收评估板bq51025EVM-649 (PWR649)

　　The bq51025EVM-649 (PWR649) wireless power receiver evaluation kit (EVM) from TI is a high performance, easy-to-use development kit for the design of wireless power solutions. It helps designers evaluate the operation and performance of the bq51025 IC, a secondary-side receiver device for wireless power transfer applications. The bq51025 device is a fully-contained, wireless power receiver capable of operating in WPC v1.1 protocol which allows a wireless power system to deliver up to 5 W to the system when used with a Qi inductive transmitter. When paired with the bq500215EVM-648 (PWR648), the bq51025 is capable of delivering up to 10 W to the system. The bq51025 device provides a single device power conversion (rectification and regulation) as well as the digital control and communication for WPC specification. The kit enables designers to speed up the development of their end-applications.

　　The bq51025EVM-649 evaluation module (PWR649) demonstrates the receiver portion of the wireless power system. This receiver EVM is a complete receiver-side solution that produces 10-W output power at up to 2-A load with adjustable output voltage. The 10-W output power can be delivered from various output voltages. The output current is limited so that the overall delivered power is less than 10 W. For example, a 10-V output can supply up to 1 A, whereas a 5-V output can deliver up to 2 A. The default configuration for this EVM is a 7-V output capable of delivering up to 1.43 A.

　　评估板bq51025EVM-649 (PWR649)主要特性:

　　• The receiver can be used in any number of devices as a power supply for a battery charger. With contact-free charging capability, no connections to the charging power source are required.

　　• 5-W power delivery with any WPC v1.1 transmitter

　　• 10-W power delivery with the bq500215 transmitter

　　• Highly-integrated wireless power receiver solution

　　– Ultra-efficient synchronous rectifier

　　– Very high efficiency post regulator

　　– WPC v1.1-compliant communication and control

　　– Only one IC required between RX coil and DC output

　　• Programmable output voltage to optimize performance for application

　　• Adaptive communication current limit (CM_ ILIM) for robust communication

　　• Supports 20-V max input

　　• Low-power dissipative overvoltage clamp

　　• Overvoltage, overcurrent, overtemperature protection

　　• Low-profile, external pick-up coil

　　• Frame is configured to provide correct receiver to transmitter spacing

　　• Room above coil for testing with battery, key for Foreign Object Detection (FOD) tuning

　　• Options to adjust the input current limit and output voltage using resistors or I2C

　　• Flexibility for FOD tuning

　　• Adjustable resistor that can be used to set RFOD

　　• Temperature sensing can be adjusted using external resistors

　　• Micro-USB connector for adapter testing configuration

　　• I2C connector (USB-TO-GPIO "HPA172" kit for I2C communication through computer is required)

　　• WPG LED indicator (Green LED is on when VOUT is high)

　　• PD_DET LED indicator (Orange LED is on when the RX is on TX pad)

　　图6. 评估板bq51025EVM-649 (PWR649)外形图

　　图7. PWR649和PWR648的按装连接图

　　评估板bq51025EVM-649 (PWR649)材料清单: