本文为电子大赛的最后提交文档，题目为简易数控直流电源，书写详细清楚，很好的参考样品-This contest final submission of electronic documents, entitled Simple NC DC power supply, writing more clear, a good reference sample

基于ATT7022的的三相电压监测原理图，支持蓄电池充放电、过放电保护、蓄电池直流切换、三相电压测量、直流电压测、过流、过压保护等功能-Based on the three-phase voltage monitoring ATT7022 schematic in support of battery charge and discharge, over-discharge protection, battery dc switch, three-phase voltage measuremen