原标题：TI bq5102x WPC 5W无线电源接收器解决方案

　　TI公司的bq5102x是无线电源接收器,符合WPC V1.1协议,当采用Qi电感发送器时, 无线电源系统能提供高达5W的功率.单片bq5102x提供电源转换(整流和稳压)以及WPC标准的数字控制和通信.输出电压在4.5-8 V间可调,5W时的系统效率79%,主要用在智能手机,平板电脑,Wi-Fi热点,移动电源和其它手持设备.本文介绍了bq5102x主要特性,功能框图, 双模式无线电源系统框图, 嵌入系统板的bq5102x电路图以及评估模块bq51020EVM-520主要特性,电路图,材料清单和PCB元件布局图.

　　The bq5102x device is a fully contained wireless power receiver capable of operating with the 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. The bq5102x device provides a single device power conversion (rectification and regulation) as well as the digital control and communication for WPC specification. With market-leading efficiency and adjustable output voltage, the bq5102x device allows for unparalleled efficiency and system optimization. I2C also 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 receiver allows for synchronous rectification, regulation and control and communication to all exist in a market leading form factor, efficiency, and solution size.

　　bq5102x主要特性:

　　Robust 5-W Solution With 50% Lower Losses

　　for Improved Thermals

　　Inductorless Receiver for Lowest Height

　　Profile Solution

　　Adjustable Output Voltage (4.5 to 8 V) for Coil

　　and Thermal Optimization

　　Fully Synchronous Rectifier With 96% Efficiency

　　97% Efficient Post Regulator

　　79% System Efficiency at 5 W

　　WPC v1.1 Compliant Communication

　　Patented Transmitter Pad Detect Function Improves User

　　Experience

　　Alignment Feature Through I2C Allows for User

　　Training to Find Best Position on Surface of TX

　　bq5102x主要用用领域:

　　Smart Phones, Tablets, and Headsets

　　Wi-Fi Hotspots

　　Power Banks

　　Other Handheld Devices

　　图1. bq5102x简化电路图

　　图2. bq5102x双模式无线电源系统框图

　　图3. bq5102x功能框图

　　图4. bq5102x WPC 5W电路图

　　图5. 嵌入系统板的bq5102x电路图

　　Bq51020无线电源接收器评估模块bq51020EVM-520 (PWR520-002)

　　The bq51020EVM-520 (PWR520-002) 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 to evaluate the operation and performance of the bq51020 IC, a secondary-side receiver device for wireless power transfer in portable applications.

　　The bq51020 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. The bq51020 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 bq51020EVM-520 evaluation module (PWR520-002) demonstrates the receiver portion of the wireless power system. This receiver EVM is a complete receiver-side solution that produces 5-W output power at up to 1-A load with adjustable output voltage.

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

　　• 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

　　• Flexibility for Foreign Object Detection (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

　　• WPG LED indicator (turns on as VOUT goes high)

　　• PD_DET LED indicator --turns on as the RX is on TX pad

　　图6. 评估模块bq51020EVM-520电路图

　　评估模块bq51020EVM-520材料清单:

　　图7.评估模块bq51020EVM-520布局案例图

　　图8.评估模块bq51020EVM-520顶层PCB元件布局图