基于DSC的智能无线充电器设计

发布时间：2018-06-13 03:30

本文选题：无线充电 + Qi标准　；参考：《苏州大学》2014年硕士论文

【摘要】：无线充电具有环境适应性强、使用方便、防爆安全等优点，在一些特殊场合具有重要的应用价值，发展前景广阔。效率和通用性是影响无线充电技术推广应用的最大问题，无线充电联盟的Qi标准规定了无线充电发射器与电能接收端之间的功率传输和通信协议，可以对无线充电器的输出功率进行调节，提高系统的传输效率。MC56F82743是Freescale公司最近推出的通用型数字信号处理器(DSC)，具有较高的性价比。本文设计了符合Qi标准的磁耦合式无线充电器(TX)系统，是作者实习期间参与设计的此芯片的应用方案，能够与符合此标准的无线电能接收端(RX)配合使用，实现高效率的电能传输，同时具有过压保护、过流保护、低功耗和金属异物检测(FOD)的功能。本文首先对无线充电器的原理进行详细分析，包括充电器的基本结构、阻抗匹配方式、PFM控制方法等。同时利用Saber软件对无线充电系统进行仿真，利用搭建的仿真电路可以直观地了解TX在不同参数下的工作情况，为系统设计提供参考。在上文分析的基础上，根据Qi标准设计了一台输出功率为5W的智能无线充电器，论文详细地给出了充电器的硬件设计，，包括主控芯片的外设、采样电路、主功率回路、信号解调电路及物体检测电路部分。同时给出了系统软件的详细设计，包括主要功能模块的关键代码、程序流程图，基于电压增益的TX输出功率的控制算法PFM+PWM，降低功耗和金属异物检测的算法等。最后，将本文设计的样机进行实验验证，得到充电器在不同工作情况下的波形图，以及系统的充电效率。结果表明，该无线充电器能够符合设计要求，且充电性能和效率达到了预期的设计要求。
[Abstract]:Wireless charging has many advantages, such as strong environmental adaptability, convenient use, explosion-proof safety and so on. It has important application value in some special occasions and has a broad development prospect. Efficiency and versatility are the biggest problems affecting the popularization and application of wireless charging technology. The Qi standard of wireless charging alliance prescribes the power transmission and communication protocol between the wireless charging transmitter and the power receiving terminal. The output power of wireless charger can be adjusted, and the transmission efficiency of the system can be improved. MC56F82743 is a universal digital signal processor recently introduced by Freescale, which has a high performance-price ratio. In this paper, a magnetically coupled wireless charger (TX) system, which conforms to Qi standard, is designed, which is the application scheme of this chip, which can be used in conjunction with the standard radio receiver (RX). It achieves high efficiency power transmission, and also has the functions of over-voltage protection, over-current protection, low power consumption and metal foreign body detection FODs. In this paper, the principle of wireless charger is analyzed in detail, including the basic structure of charger, impedance matching method and PFM control method. At the same time, the wireless charging system is simulated by using Saber software. The simulation circuit can intuitively understand the working conditions of TX under different parameters, and provide a reference for the design of the system. Based on the above analysis, an intelligent wireless charger with output power of 5W is designed according to Qi standard. The hardware design of the charger is presented in detail, including the peripheral device of the main control chip, sampling circuit, main power loop, and so on. Signal demodulation circuit and object detection circuit. At the same time, the detailed design of the system software is given, including the key code of the main function module, the program flow chart, the control algorithm of TX output power based on voltage gain, the algorithm of reducing power consumption and detecting metal foreign body, etc. Finally, the prototype designed in this paper is verified by experiments, and the waveform diagram of the charger under different working conditions and the charging efficiency of the system are obtained. The results show that the wireless charger can meet the design requirements, and the charging performance and efficiency meet the expected design requirements.
【学位授予单位】：苏州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM910.6

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