全国大学生电子设计大赛报告.docxVIP

全国大学生电子设计大赛报告 全国大学生电子设计大赛报告 题目名称：开关电源模块并联供电系统（A 开关电源模块并联供电系统是采用8位Atmega88的开关电源，主电路采用LM2576和LM2596作为两块并联的开关电源。LM2576作为恒压源，LM2596作为恒流源。该两块开关电源保证系统的效率，电流电压调整率和输出精度要求。系统具有限流保护功能，HD7279键盘输入输出等多种功能。该系统主要采用硬件反馈调节，调整能力强，使单片机负载小。 本系统功能完善，在支路在0.5-2A输出范围内，干路电流输出范围使1-4A其分压比由外界输入。由AD采用，读出干路电流，经数字电位器调整恒流源工作状态，使其自调整实现固定分压比，并且电流精度满足在百分之五以内。关机或过流保护收后，具有可以记忆参数、自恢复功能。 Abstract Switching power supply modules in parallel power supply system is the use of 8-bit Atmega88 switching power supply, the main circuit LM2576 and LM2596 as two parallel switching power supply. LM2576 as the voltage source, LM2596 as a constant current source. The two switching power supply to ensure efficiency of the system, current and output voltage regulation accuracy requirements. System has a current limit protection, HD7279 keyboard input and output functions. The system uses hardware feedback regulation, adjust the ability to make a small single-chip load. The system is functional, the branch in the output range of 0.5-2A, distributors current output range 1-4A the partial pressure than by the external input. Used by the AD, to read out the current trunk, the digital potentiometer to adjust the current source working condition, to self-adjust to achieve a fixed partial pressure ratio, and accuracy to meet the current five percent or less. After closing down or over-current protection, with memory parameters can be, since the recovery. 1 方案论证与比较 ...................................................................................................... 3 1.1 系统方案论证 ..................................................................................................... 3 1.2 过流保护方案论证 ............................................................................................. 5 2 系统设计 .................................................................................................................. 6 2.1 总体设计 ...............................................................