基于STM32漏电保护的5V直流线性稳压源的设计  

The design of 5V DC linear stabilized voltage source with leakage protection based on STM32

作　　者：倪瑛[1,2] 顾金国 骆静[2] 

机构地区：[1]南京航空航天大学电子信息工程学院,江苏南京210016 [2]南京工业职业技术学院能源与电气工程学院,江苏南京210023 [3]南京沃泽电气有限公司,江苏南京210008

出　　处：《电子设计工程》2016年第13期164-166,共3页Electronic Design Engineering

基　　金：2014年度江苏省智能传感网工程技术研究开发中心开放基金立项项目(ZK14-02-02)

摘　　要：设计了5 V/1 A 4‰精度低压差直流线性稳压源,能够实现5.5~25 V宽电压输入。采用德州仪器（TI）TL431B精度4‰并联电压基准,作为电压闭环反馈控制主IC,从而确保整个电路的输出电压5‰精度。其中意法半导体的Cortex-M3内核STM32 AM7采用外部高精度基准源,通过内置12 bit AD实时的对工作电流、工作电压、漏电流、输出功率、漏电流功耗采样,处理完有效数据在显示器件上显示,同时控制相关部件对电源进行软、硬件的短路和漏电保护。经过对实际电路的测试,能够实现最低输入电压5.3 V,最高输入电压45 V 0.2%的输出精度,漏电流采样精度的绝对值≤5%。This paper gave the design of 5 V/1 A 4‰ precision and low dropout DC linear stabilized voltage source, which can achieve the 5.5 ~25V wide input voltage. In this design TI TL431 B,which can realize 4‰ accuracy parallel voltage reference, was used as voltage close loop feedback to control main IC, to ensure the output voltage 5‰ precision. The STMicroelectronics Cortex-M3 kernel STM32 AM7 using external high precision reference source, sampled working current and voltage, leakage current, output power, leakage power through the built-in 12 bit AD converter and displayed the valid parameters on display device. At the same time, STM32 AM7 can control the relevant components to provide short circuit and leakage protection with software and hardware. After the actual circuit testing, this design outputted high precision voltage of0.2% precision even in the minimum input voltage 5.3 V, and the maximum input voltage 45 V. The absolute value of leakage current was less than 5%.

关 键 词：直流 线性稳压源 漏电保护 低压差 高精度 

分 类 号：TN7[电子电信—电路与系统]