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[原创] Rohm BD57121MUF-M汽车NFC兼容无线功率发送解决方案

关键词:汽车电子 无线功率发送 NFC AEC-Q100规范

时间:2019-02-11 10:59:57       作者:Rohm       来源:中电网

Rohm公司的BD57121MUF-M是汽车NFC兼容无线功率发送器评估板,包括了ROHM公司的汽车级(AEC-Q100规范)无线功率发送控制IC(BD57121MUF-M)和ST公司的NFC阅读器IC(ST25R3914)以及8位MCU(STM8A系列),兼容WPC的Qi标准,充电高达15W,多线圈设计加宽了充电范围(比单线圈大2.7倍),输入电压11.0-13.0V,输出电压12.0V(接收边),输出电流1.25A(接收边).本文介绍了评估板BD57121MUF-M主要特性和性能指标,无线功率传输和NFC的系统配置图以及评估板BD57121MUF-M主要元件,框图,连接图,电路图,材料清单和PCB设计图.

ROHM has recently announced the development of an automotive wireless charging solution with integrated NFC communication. This solution combines ROHM’s automotive-grade (AEC-Q100 qualified) wireless power transmission control IC (BD57121MUF-M) with STMicroelectronics’NFC Reader IC (ST25R3914) and 8-bit microcontroller (STM8A series). In addition to being compliant to WPC’s Qi standard supporting EPP (Extend Power Profile) that enables the charger to supply up to 15W of power, the multi-coil design enables a wide charging area that provides some spatial freedom in vehicle applications (2.7x greater charging range vs single coil configurations). This means that consumers do not need to worry much about exactly aligning their smartphones to the provided charging area in order to be able to charge wirelessly.

Wireless charging technology, commonly used in portable devices such as smartphones to improve the safety and resistance to water and dust of connectors, is seeing increased adoption in infrastructure applications including vehicles, hotels, airports, cafes, and similar public locations. At present, Qi, the most popular standard, has already been adopted by the European Automotive Standards Group (CE4A) as the charging standard in vehicles, and by 2025 it is predicted that most cars will be equipped with Qi-based wireless chargers.

Meanwhile, NFC communication provides user authentication to allow Bluetooth/WiFi communication with infotainment system, lock/unlock the doors, and allow engine start. NFC also enables vehicle setting customization for multiple drivers such as seat and mirror positioning, infotainment pre-sets, and navigation destination pre-sets.

BD57121MUF-EVK-001 Evaluation Board is based on the BD57121MUF-M Automotive-grade wireless power transmitter IC. This boardintegrates the ST25R3914 NFC reader/writer IC from ST Microelectronics to detect the presence of any NFC cards or tags and to preventdamaging of the NFC antennae by the wireless power transfer system. Wireless power transfer is compliant with WPC Qi ver1.2.4 and can supplypower up to 15 W (output in receiver). Detection and identification of NFC Type A, B, F and V are possible.

评估板BD57121MUF-M主要特性:

・Compliance to WPC Qi ver1.2.4
・Support of Multiple coils to increase charging area(Qi MP-A13 coil type)
・Power control using fixed frequency and variable voltage
・NFC card/tag detection of Type A, B, F, V
・Housing size: 120 mm x 65 mm x 30 mm

图1.评估板BD57121MUF-M外形图

评估板BD57121MUF-M性能指标:

These are only representative values, and they do not represent guaranteed values of the product characteristics.
VIN = 12 V, unless otherwise specified.

System configuration for wireless power transfer and NFC

Wireless power transfer system consists of a two-way power transmission and communication system using a transmitter and areceiver, and the NFC system also communicates between the reader (= transmitter) and the listener. A single Microcontroller (MCU)controls both wireless power transmission and NFC reader, so it is possible to have seamless operation between each other.

图2.用于无线功率传输和NFC的系统配置图
评估板BD57121MUF-M主要元件:


图3.评估板BD57121MUF-M-001框图

图4.评估板BD57121MUF-M-001连接图

图5.评估板BD57121MUF-M-001电路图(1)

图6.评估板BD57121MUF-M-001电路图(2)
评估板BD57121MUF-M-001材料清单:



图7.评估板BD57121MUF-M-001 PCB设计图(1):顶层丝印和布局

图8.评估板BD57121MUF-M-001 PCB设计图(2):底层丝印和布局

图9.评估板BD57121MUF-M-001 PCB设计图(3):顶层布局

图10.评估板BD57121MUF-M-001 PCB设计图(4):中间1层布局

图11.评估板BD57121MUF-M-001 PCB设计图(5):中间2层布局

图12.评估板BD57121MUF-M-001 PCB设计图(6):底层布局
详情请见:
https://d1d2qsbl8m0m72.cloudfront.net/en/products/databook/datasheet/ic/power/switching_regulator_system/bd57121muf-evk-001_ug-e.pdf
bd57121muf-evk-001_ug-e.pdf

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