直流稳压电源及漏电保护装置设计

A design for DC stabilized power supply and leakage-protection device

提供一种线性直流稳压电源及漏电保护装置的设计方法,以芯片LM2577、LM2576和单片机为核心制作DC—DC转换器,提供额定输出电压为5V±0.05V、额定输出电流为1A的直流稳压电源。可以实现直流电压输入5.5-25V,输出电压保持在5V±0.05V,电压调整率SU≤1%;当输入电压为7V,直流稳压电源输出电流由1A减小到0.01A,负载调整率SL≤1%,并能够实现功率测量与实时显示,能够实现对模拟漏电支路的漏电保护动作。

This paper proposes a design for the linear DC stabilized power supply and leakage-protection device with taking the chips of LM2577,LM2576 and the single-chip microcomputer as the core to produce a DC—DC converter,meanwhile,it provides the DC stabilized power supply with the rated output voltage of 5V±0.05 Vand the rated output current of 1A.It can achieve that 5V±0.05 Vof output voltage is maintained with 5.5-25 Vof input DC voltage whose voltage regulation factor（SU）is less than or equal to 1%.At the same time,the output DC regulated power supply current will reduce from 1Ato 0.01 Awhen the input voltage is 7V,and the load regulation rate（SL）will be less than or equal to 1%,it gets the aim of power measurement and real-time display,what＇s more,it can also realize the protection-action to the leakage of the simulation-leakage branch.