Power supply circuit
View Patent ↗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.
1 . 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.
2 . The power supply circuit according to claim 1 , wherein the first voltage conversion module is configured to convert a fifth voltage input by the input power supply into a sixth voltage when the input power supply is normal, input the sixth voltage to the gate of the first MOS transistor and the gate of the second MOS transistor respectively, and input a high-level signal to the complex programmable logic device, wherein the sixth voltage is a high-level voltage.
3 . The power supply circuit according to claim 2 , wherein the complex programmable logic device is configured to output a high-level general purpose input/output signal to the enable pin of the power supply protection module when the high-level signal is detected.
4 . The power supply circuit according to claim 3 , wherein the first MOS transistor is further configured to divide the sixth voltage to obtain a seventh voltage, and input the seventh voltage to the second voltage conversion module and the power supply protection module respectively.
5 . The power supply circuit according to claim 4 , wherein the second MOS transistor is further configured to turn off when the sixth voltage output by the first voltage conversion module is detected.
6 . The power supply circuit according to claim 5 , wherein turning off when the sixth voltage output by the first voltage conversion module is detected comprises:
turning off when it is detected that the sixth voltage output by the first voltage conversion module is a high-level voltage, by the gate of the second MOS transistor.
7 . The power supply circuit according to claim 4 , wherein the power supply protection module is further configured to turn on when the high-level general purpose input/output signal is detected, convert the seventh voltage into an eighth voltage and input the eighth voltage to the interface module to charge the external mobile power supply.
8 . The power supply circuit according to claim 3 , wherein the complex programmable logic device is further configured to detect that a signal of the indicator pin of power supply of the first voltage conversion module is a low-level signal, and control the output terminal of the complex programmable logic device to enter a low-resistance mode.
9 . The power supply circuit according to claim 1 , further comprising a first resistor, wherein one end of the first resistor is connected to the gate of the first MOS transistor, and the other end of the first resistor is connected to the input terminal of the first voltage conversion module.
10 . The power supply circuit according to claim 1 , further comprising a second resistor and a third resistor, wherein one end of the second resistor is connected to the input terminal of the second voltage conversion module, the other end of the second resistor is connected to one end of the third resistor and an enable pin of the second voltage conversion module respectively, and the other end of the third resistor is grounded.
11 . The power supply circuit according to claim 1 , further comprising a fourth resistor and a fifth resistor, wherein one end of the fourth resistor is connected to the output terminal of the first MOS transistor, the other end of the fourth resistor is connected to the enable pin of the power supply protection module, one end of the fifth resistor and the output terminal of the complex programmable logic device respectively, and the other end of the fifth resistor is grounded.
12 . The power supply circuit according to claim 1 , further comprising a sixth resistor, wherein one end of the sixth resistor is connected to the gate of the second MOS transistor, and the other end of the sixth resistor is connected to the output terminal of the first voltage conversion module.
13 . The power supply circuit according to claim 1 , further comprising a diode, wherein one end of the diode is connected to the interface module, and the other end of the diode is grounded.
14 . The power supply circuit according to claim 13 , wherein the diode is configured to absorb a reverse current generated at the interface module when the input power supply is cut off.
15 . The power supply circuit according to claim 1 , further comprising a third voltage conversion module and a deployment device, wherein an input terminal of the third voltage conversion module is connected to the output terminal of the first MOS transistor, and an output terminal of the third voltage conversion module is connected to the deployment device.
16 . The power supply circuit according to claim 15 , further comprising a seventh resistor and an eighth resistor, wherein one end of the seventh resistor is connected to the input terminal of the third voltage conversion module, the other end of the seventh resistor is respectively connected to an enable pin of the third voltage conversion module and one end of the eighth resistor, and the other end of the eighth resistor is grounded.
17 . The power supply circuit according to claim 1 , wherein the first MOS transistor is an N-type MOS transistor and the second MOS transistor is a P-type MOS transistor.
18 . The power supply circuit according to claim 1 , in response to converting the third voltage into the fourth voltage to supply power to the baseboard management controller, the second voltage conversion module is configured to:
convert the third voltage into the fourth voltage, and inputting the fourth voltage into the baseboard management controller to supply power to the baseboard management controller, wherein the third voltage is 10V and the fourth voltage is 3.8V.
19 . The power supply circuit according to claim 1 , wherein a gate voltage of the second MOS transistor is zero, and the second MOS transistor is turned on.
20 . The power supply circuit according to claim 1 , wherein the interface module comprises a universal serial bus (USB) or Type C.