无线充电设计(二)-方案设计

本文深入探讨了无线充电的两大主流方案:MCU方案与SOC方案,包括MOS外置SOC和DrMOS外置SOC的特点及应用。同时,推荐了几种参考设计,如IDT无线电参考套件、TI的可穿戴设备电源参考设计和NXP的无线充电器演示板。

无线充电采用的主流方案有两种:MCU方案和SOC方案。

  • MCU方案

无线充电早期方案,MCU芯片,控制芯片,驱动芯片,运放全部独立,外围元件也相当多,复杂,不利于产品快速开发。

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  • SOC方案

SOC方案又分为两种类型:

  1. MOS外置SOC方案

SOC芯片内部集成了无线驱动、H桥驱动、运放、MCU等功能。外置MOS可以自由配置,灵活性较高,是使用最广泛的一种SOC方案

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  1. DrMOS外置SOC方案

由一颗控制芯片和一颗智能全桥芯片 SmartBridge构成,智能全桥芯片集成了全桥 MOS和 Driver,可以实现 MOS 和Driver 匹配,大电流时需要考虑散热、效率。

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无线充电方案相对成熟,推荐一些参考设计:

参考

Automotive Wireless Transmitter Controller Features • Conforms to the latest version WPC “Qi” specification • Supports wide DC input voltage range of 6 V (limited duration at Start/Stop operation) to 16 V for automotive battery input • Supports Foreign Object Detection (FOD) • Low-power system standby available using Freescale Touch technology • Provides free positioning solutions by using WPC A or B type multi-coil technology • Uses rail voltage control or phase shift control with fixed operating frequency to control power transfer to help alleviate automotive system interference • Supports the key FOB avoidance function • Supports the operation frequency dithering technology to eliminate the AM band interference • Improved EMC performance for automotive certification • Supports CAN/LIN/IIC/SCI/SPI interfaces • LED for system status indication • Over-voltage/current/temperature protection • Software based solution to provide maximum design freedom and product differentiation • AEC-Q100 grade 2 certification • Dual-mode capable Overview Description The WCT100xA is a wireless power transmitter controller that integrates all required functions for WPC “Qi” compliant wireless power transmitter design. The WCT100xA transmitter IC manages the power transfer by receiving commands from the receiver. Receivers are detected by using either standard protocol methods or Freescale touch sensor technology. Once the mobile device is detected, the WCT100xA controls the power transfer by adjusting rail voltage or phase shift of power stage according to message packets sent by mobile device. To maximize the design freedom and product differentiation, the WCT100xA supports any 5W coil topology capable of supporting WPC Qi-based implementation. In addition, the system supports both WPC and PMA protocols. The WCT100xA also includes CAN/LIN/IIC/SCI/SPI interfaces, over-voltage/current/temperature protection and FOD method to protect from overheating by misplaced metallic foreign object
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