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 measurement, measure the DC voltage, over current, over voltage protection function