全国大学生电子设计竞赛单相 AC/DC 变换电路（A 题）摘 要 本系统以 Boost 升压斩波电路为关键，采用 PFC 功率因数校正专用控制芯片 UCC28019 产生 PWM 波形，进行闭环反馈控制，从而实现稳压输出。试验成果表明：电源进线的交流电压和负载电流在比较宽的范围内变化时，电源输出直流电压可以保持较高的稳定性，电源交流输入功率因数达到 89%，效率达到 92%，具有良好的电压调整率和负载调整率，此外，本系统还具有输出 2.5A过流保护，输出功率因数的测量与显示功能。关键词：开关电源 UCC28019 Boost 电路 功率因数校正 【Abstract】This system in order to Boost the Boost chopper circuit as the core, adopts PFC control chip dedicated power factor correction UCC28019 PWM waveforms, the closed-loop feedback control, so as to realize the voltage output. The experimental results show that the power supply into line voltage and load current changes in a comparatively wide scope, can maintain the stability of the high power output dc voltage, power supply ac input power factor reaches more than 89%, efficiency of 92%, has the good voltage regulation and load regulation, In addition, this system also has 2.5 A output over-current protection, the measurement and display of power factor of the output.目 录1 系统方案....................................................................11.1DC／DC 变换模块的论证和选择...............................................................................11.2PFC 控制方案的论证和选择.......................................................................................22 系统理论分析与计算..........................................................22.1 电路设计的分析.................................................................................................................2主电路的分析...................................................................................................................2控制电路的分析.....................................
