Oring fault detection method and power supply system

An ORING fault detection method, which is applied to a power supply system comprising a plurality of power supply modules connected in parallel, each power supply module comprising a primary unit, a secondary unit, an ORING unit and a control unit, the primary unit and the secondary unit of each power supply module being connected and the ORING unit located at an output side of the secondary unit, the control unit at least connected to the ORING unit, the method comprising:

• starting the primary units of the plurality of power supply modules in a time-sharing manner;
• starting the secondary units of the plurality of power supply modules within a first delay;
• and
• as for each power supply module, if a bus voltage at an output end of the power supply module within the first delay is within a first threshold range, initiating ORING detection of the power supply module, comprising:
• determining whether the ORING unit is in a healthy state by judging whether an output current of the power supply module has a negative current, or whether a voltage difference before and after the ORING unit of the power supply module is less than a preset value.