Detection device for power supply circuit of three-phase motor and a power supply system

The invention discloses a detection device for a power supply circuit of a three-phase motor and a power supply system, and the device comprises a first output voltage detection module, a second output voltage detection module and a third output voltage detection module which are used for detecting the output voltage of a three-phase circuit at the output end of the three-phase motor. The output voltage of the output end of the three-phase motor is related to the on or off state of the three-phase power supply switch, so that the first processing module can determine the state of the output end of the three-phase power supply switch based on the three-phase output voltage acquired by the three output voltage detection modules and the control instruction of the three-phase power supply switch; and reliable detection of the state of the output end of the three-phase power supply switch is realized. 本申请公开了一种三相电机的供电电路的检测装置及供电系统，包括分别对三相电机的输出端的三相电路上的输出电压进行检测的第一输出电压检测模块、第二输出电压检测模块及第三输出电压检测模块，又考虑到三相电机的输出端的输出电压与三相供电开关