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[原创] ST STWLC04 Qi协议1W无线功率接收方案

关键词:Qi协议 无线充电器 可穿戴电子 STWLC04

时间:2017-06-13 10:48:27       作者:ST       来源:中电网

ST公司的STWLC04是基于Qi协议的1W无线功率接收器,具有数字控制和精密的模拟控制回路,保证了稳定工作.和STWBC-WA发送器一起,组成完整的无线发送方案.I2C接口可使许多参数定制化,并把配置存储在嵌入的NVM中,主要用在可穿戴设备,智能手表,医疗和保健仪器以及智能眼镜.本文介绍了STWLC04主要特性,框图和应用电路,以及基于STWBC-WA的可穿戴应用的无线充电发送器评估板STEVAL-ISB038V1T主要指标,框图,电路图,材料清单和PCB设计图.

The STWLC04 is an integrated wireless power receiver suitable for wearable applications. The STWLC04 is focused on 1-watt power transfer based on Qi protocol with digital control and precise analog control loops ensuring stable operation. Together with the STWBC-WA transmitter, the STWLC04 enables a complete wireless power transmission. I2C interface allows many parameters to be customized in the device and this configuration can be stored in the embedded NVM.

The STWLC04 can deliver the output power in two modes: as a power supply with configured output voltage or as a simple CC/CV battery charger with configurable charging current, charging voltage and termination current. The STWLC04 can detect the external (wired) power supply connection and drive an external power switch.

The STWLC04 is an advanced, integrated receiver IC for wireless power transceiver in wearable applications optimized for 1 W. It works as a voltage source with regulated output voltage, typically 5 V and can also be reconfigured into a simple battery charger mode (CC/CV) to charge directly Li-Ion or Li-Polymer batteries. The STWLC04 can operate autonomously or can be controlled through I2C by the host system.

STWLC04主要特性:

1 W output power 
Qi 1.0 wireless communication protocol based 
Integrated high efficiency synchronous rectifier 
800 kHz programmable step-down converter with input current and input voltage regulation loop 
Step-down converter efficiency up to 90% 
Simplified Li-Ion/Polymer charger function 
32-bit, 16 MHz embedded microcontroller with 16 kB ROM and 2 kB RAM memory 
2 kB NVM for customization 
Integrated driver for external supply switch 
Precise voltage and current measurements for received power calculation 
I2C interface 
Configurable GPIO output 
Rx coil NTC protection 
Thermal protection 
Low power dissipative rectifier overvoltage clamp 
Flip Chip 77 bumps (3.12x4.73 mm)

STWLC04应用:

Wearable applications 
Smart watches 
Glasses 
Medical and healthcare instrumentation

图1. STWLC04简化框图

图2. STWLC04应用电路图

基于STWBC-WA的可穿戴应用的无线充电发送器评估板STEVAL-ISB038V1T

STEVAL-ISB038V1T is the wireless charger transmitter unit component of the STEVAL-ISB038V1 wireless charging reference design for wearable applications. It is based on the STWBC-WA and is designed to transfer up to 1 watt of power to wireless power to devices requiring the use of small coils. It can be modified to deliver up to 3 watts.

The STEVAL-ISB038V1 is a wireless battery charger reference design evaluation kit designed for ultra-compact battery operated devices, such as wearable gear, smartwatches, Internet of Things sensors and healthcare devices.

The design is optimized for 1-watt wireless power transfer with a half-bridge topology on the transmitter side and with tiny 11 mm and 20 mm coils on the receiver and transmitter sides, respectively. For power transfers up to 3 watts, the design can be modified by using larger coils and a full-bridge configuration on the transmitter.

The STWBC-WA transmitter can support a cost-effective half-bridge topology (full-bridge optional) and a powerful software API lets you modify the behavior of LED and general purpose IOs as well as connecting external peripherals or devices like sensors to the design via the on-chip I²C and UART ports.

The STWLC04 is designed for 1-watt power transfer based on the Qi protocol, with digital control and precise analog control loops ensuring stable operation. The I²C interface allows a high degree of customization and settings can be stored in the embedded non-volatile memory.


图3.发送器评估板STEVAL-ISB038V1T外形图

评估板STEVAL-ISB038V1T主要特性:

•STWBC-WA based wireless power transmitter− Additional transmitter module compatible with the STEVAL-ISB038V1 reference kit
− Cost effective Half Bridge topology with integrated drivers
− Optional Full Bridge configuration for 3 W applications
− Active presence detector
− 2-layer PCB for easy design
− Turnkey solution or customizable via APIs
− Parametric customization via graphical interface
•Full KIT characteristics:− 11 mm coil on Receiver
− 20 mm coil on Transmitter
− 1 Watt delivered on Receiver side
− USB 5 V input
− Foreign Object Detection (FOD) optional
− Graphical interface for monitoring behavior
− Total reference design
− RoHS compliant
•STWLC04 wireless power receiver− Output voltage: 5 V regulated voltage
− Integrated high efficiency synchronous rectifier
− Li-Ion/Li-Pol charger functionality
− 4-layer PCB for easy design
评估板STEVAL-ISB038V1T电性能表:


图4.发送器评估板STEVAL-ISB038V1T框图

图5.发送器评估板STEVAL-ISB038V1T和SWIM连接器

图6.发送器评估板STEVAL-ISB038V1T电路图(1):发送器控制级

图7.发送器评估板STEVAL-ISB038V1T电路图(2):发送器电源级

图8.发送器评估板STEVAL-ISB038V1T电路图(3):USB-UART dongle
发送器评估板STEVAL-ISB038V1T材料清单:





图9.发送器评估板STEVAL-ISB038V1T PCB设计图(1):顶层丝印

图10.发送器评估板STEVAL-ISB038V1T PCB设计图(2):底层丝印

图11.发送器评估板STEVAL-ISB038V1T功能区块

图12.发送器评估板STEVAL-ISB038V1T电源信号布局图

图13.发送器评估板STEVAL-ISB038V1TIsense和波信号模拟输入信号走线图

图14.发送器评估板STEVAL-ISB038V1T UART信号和驱动桥的开关信号
详情请见:
http://www.st.com/content/ccc/resource/technical/document/datasheet/group3
/d3/fe/d4/97/3c/a3/42/46/DM00313662/files/DM00313662.pdf/jcr:content/translations/en.DM00313662.pdf

http://www.st.com/content/ccc/resource/technical/document/user_manual/group0/56/c5/b1/29/30
/9c/49/7f/DM00318158/files/DM00318158.pdf/jcr:content/translations/en.DM00318158.pdf

en.DM00313662.pdf
en.DM00318158.pdf

 

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