Power supply circuit

A power supply circuit, comprising a first voltage conversion module, a first metal-oxide-semiconductor field-effect transistor (MOS transistor), a second voltage conversion module, a second MOS transistor, a baseboard management controller and an interface module;

• wherein,
• an output terminal of the first voltage conversion module is respectively connected to an input terminal of the first MOS transistor and a gate of the second MOS transistor, an input terminal of the first voltage conversion module is connected to a gate of the first MOS transistor, the first voltage conversion module is configured to output a first voltage to the gate of the first MOS transistor and the gate of the second MOS transistor when an input power supply is abnormal;
• the first voltage is a low-level voltage;
• an output terminal of the first MOS transistor is respectively connected to an input terminal of the second voltage conversion module and an output terminal of the second MOS transistor, and the first MOS transistor is configured to turn off when it is detected that the input power supply is abnormal;
• the interface module is connected to an input terminal of the second MOS transistor, and the interface module is configured to input a second voltage input by an external mobile power supply to the second MOS transistor, wherein the second voltage is a high-level voltage;
• the second MOS transistor is configured to turn on when the first voltage is detected, and input a third voltage obtained by dividing the second voltage into the second voltage conversion module;
• an output terminal of the second voltage conversion module is connected to a baseboard management controller, and the second voltage conversion module is configured to convert the third voltage into a fourth voltage to supply power to the baseboard management controller;
• further comprising a power supply protection module and a complex programmable logic device;
• wherein an input terminal of the power supply protection module is respectively connected to the output terminal of the first MOS transistor and the output terminal of the second MOS transistor, an output terminal of the power supply protection module is connected to the interface module and the input terminal of the second MOS transistor, an input terminal of the complex programmable logic device is connected to a power indication pin of the first voltage conversion module, and an output terminal of the complex programmable logic device is connected to an enable pin of the power supply protection module, the complex programmable logic device is configured to output a low-level general purpose input/output signal to the power supply protection module when a low-level signal is detected, and the power supply protection module is configured to turn off when the low-level general purpose input/output signal is received.