摘 要 在当代经济的发展和生活水平的提高下，让人们对自身的生命安全财产的保护越来越重视，而防盗警报器的发展成为了人们关心问题，而目前国内市场出现的防盗报警系统，（）文设计了一个以 C8051F020 为控制核心的简易数控恒流源系统，实现了-2A 到 2A 数控可调直流恒流 关键词：恒流源；C8051F020 单片机；数字控制；稳压；扩流 【 The paper designs a simple constant-current source based on SCM C8051F020 as a control core, and realizes a digital control adjustable DC constant-current system within the current range from -2A to 2A.The power part uses high power transformer for power supply, uses multilevel capacitance and network to eliminate ripple interference. The power output part uses three-voltage chip for stabilizing voltage,and make use of high power Dalindon tube to enlarge current to meet the demand level after expanding power flow. The constant-current source part uses multiple precision operational amplifiers OP07 to constitute a closed-loop feedback control form, so as to improve the control precision, and the controlled part adopts Dalindon tube to enlarge current and precisely set output current. The current measurement part uses kang-manganese bronze resistance wire as the precise sampling resistance, free from the effect of ambient temperature. The display part uses 128*64 dot-matrix LCD for real-time display the setting current value and measured value. The digital control constant-current source features ocular and simple control interface, and good human-computer interaction.Key words:Constant-current source; C8051F020; Digital control; Voltage stabilization; Enlarging current 【目录部分一级目录标题采用小四黑体，二级目录标题采用 5 号黑体， 目 录 三级目录标题采用 5 号宋体 目录部分排版行距采用固定值 20 磅】摘 要 ..............................................................
