2013年全国大学生电子设计竞赛双向DC-DC变换器（A题）2015年8月12日摘要本系统以Buck和Boost并联，实现双向DC-DC交换，以STM32为核心控制芯片。Buck降压模块使用XL4016开关降压型转换芯片，通过单片机闭环实现恒流输出控制。放电回路选择Boost升压模块，以UC3843作为PWM控制器，组成电压负反馈系统，通过调整PWM的占空比，实现稳压输出。系统能自动检测外部电源电压变化，在负载端电源较高时自动切换成充电模式，反之切换为放电状态。系统具有过流、过压保护功能，并可对输出电压、电流进行测量和显示。?关键字： DC-DC交换；Buck；Boost；PWM控制AbstractThe system is Buck and Boost parallel, to achieve two-way DC-DC exchange, STM32 as the core control chip. The Buck Buck module uses the XL4016 switch Buck converter chip, takes the current signal in the output, controls the feedback of XL4016, completes the closed-loop control, and realizes the constant current output. Boost boost module uses UC3843 as the PWM control chip, according to the output voltage negative feedback signal to adjust the PWM signal, the closed-loop control is carried out, in order to achieve the regulator output. System can automatically switch charge and discharge mode, can also be manually switch. The system has the fun