POWER SUPPLY CIRCUIT

The present application provides a power supply circuit. When a power supply input by a server is abnormal, a first voltage conversion module inputs a low-level voltage to a gate of a second MOS transistor, and the second MOS transistor is turned on. At this time, a second voltage input by an external mobile power supply may be input to the second MOS transistor through an interface module, and the second MOS transistor divides the second voltage to obtain a third voltage and inputs the third voltage to the second voltage conversion module. The second voltage conversion module may convert the third voltage into a fourth voltage to supply power to a baseboard management controller, so that the baseboard management controller in the server has a working power supply temporarily by using the external mobile power supply to reversely supply power to the baseboard management controller, so that the backstage personnel may continue to obtain log information in the baseboard management controller, quickly understand reasons for the abnormal power supply of the server, realize rapid positioning of abnormal problems, and provide convenience for users.