Power-failure hold circuit, power supply protection method and apparatus, and power supply control circuit

Abstract

The present application relates to the technical field of power supply protection, and discloses a power-failure hold circuit, a power supply protection method and apparatus, and a power supply control circuit. The power-failure hold circuit comprises: a first energy storage circuit comprising a plurality of capacitors connected in parallel, wherein the plurality of capacitors are used for storing energy on the basis of an input bus voltage of a server and reversely supplying power to the server; a second energy storage circuit comprising an inductor and a first switch transistor, wherein the inductor and the first switch transistor are sequentially connected in series between an input bus positive electrode and an input bus negative electrode, and the inductor is used for storing energy so as to boost the voltage to a target voltage; and a third energy storage circuit comprising a second switch transistor and an energy storage capacitor, wherein the second switch transistor and the energy storage capacitor are sequentially connected in series between the inductor and the input bus negative electrode, the inductor is used for charging the energy storage capacitor, and the energy storage capacitor reversely supplies power to the server.

Description

Power-off holding circuit, power supply protection method, power supply control circuit and device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on June 13, 2023, with application number 202310695687.4, and application name “Power-off retention circuit, power supply protection method, power supply control circuit and device”, all contents of which are incorporated by reference in this application. Technical Field

[0003] The present application relates to a power-off holding circuit, a power supply protection method, a power supply control circuit and a device. Background Art

[0004] With the continued growth of the power supply business, servers are increasingly demanding higher and higher levels of power supply stability. When a server's input voltage drops abnormally or a fault occurs, the system must quickly report and store information about the system's operating status and abnormal grid voltage within the power-off holdup time, and then switch to a backup power source. Therefore, a power-off holdup circuit must be incorporated into the server's power supply system to ensure the server maintains this holdup time.

[0005] In related technologies, in order to ensure that the server has a power-off retention time, a large-capacitance electrolytic capacitor is connected in parallel to the input end of the server's DC switching power supply. When the server input voltage drops abnormally or fails, the large-capacitance electrolytic capacitor can be used to power the server, thereby meeting the server's power-off retention time requirement.

[0006] However, the inventors realized that using this method to power servers can lead to a significant voltage difference between the server's internal voltage and the voltage released by the large-capacitance electrolytic capacitors when the server input voltage drops abnormally or fails. This can cause a large inrush current at the server input, compromising server safety. Therefore, a power-off holdover circuit is urgently needed that can meet the server's power-off holdover time requirements and ensure server safety.

[0007] Summary of the Invention

[0008] According to various embodiments disclosed in this application, in a first aspect, a power-off holding circuit is provided, the power-off holding circuit comprising:

[0009] A first energy storage circuit includes a plurality of capacitors connected in parallel, the plurality of capacitors being used to store energy according to an input bus voltage of the server and to reversely supply power to the server;

[0010] The second energy storage circuit includes an inductor and a first switching tube, which are sequentially connected in series between the positive electrode of the input bus and the negative electrode of the input bus. The inductor is used to store energy to boost the voltage to a target voltage.

[0011] The third energy storage circuit includes a second switching tube and an energy storage capacitor. The second switching tube and the energy storage capacitor are connected in series between the inductor and the negative pole of the input bus. The inductor is used to charge the energy storage capacitor, and the energy storage capacitor provides reverse power to the server.

[0012] According to various embodiments disclosed in this application, a second aspect provides a power supply protection method, which is applied to the power-off holding circuit of the first aspect or any corresponding embodiment thereof, and the method includes:

[0013] Detect the voltage signal on the server input bus;

[0014] When the voltage on the input bus is less than or equal to the first voltage threshold, the server is reversely powered based on the first voltage in the multiple capacitors in the first energy storage circuit, and / or the second voltage in the energy storage capacitor in the third energy storage circuit is reversely powered for the server.

[0015] According to various embodiments disclosed in this application, in a third aspect, a power supply control circuit is provided. The power supply control circuit is used to control a power-off holding circuit to reversely supply power to a server. The power-off holding circuit is the power-off holding circuit of the first aspect or any corresponding embodiment thereof. The power supply control circuit includes:

[0016] A first drive circuit includes a first power supply, a first switch, a second switch, a first control drive unit for a third switch tube, a first delay unit, and a second control drive unit for the second switch tube. The first power supply, the first switch, the second switch, the first delay unit, and the second control drive unit are connected in series in sequence. The first control drive unit is connected between the second switch and the first delay unit. The first power supply is used to power the first drive circuit. The first control drive unit is used to control the third switch tube to be in an on state or an off state. The second control drive unit is used to control the second switch tube to be in an on state.

[0017] An input voltage detection unit, connected to the input bus, for detecting the voltage on the input bus;

[0018] an input voltage determination unit, wherein a first end of the input voltage determination unit is connected to the input voltage detection unit, and a second end of the input voltage determination unit is connected to the second switch, the input voltage determination unit being configured to compare a first voltage within a plurality of capacitors in the first energy storage circuit with a first voltage threshold, and to control the second switch to be in an on state or in an off state based on a first comparison result, wherein the first comparison result is a comparison result between the first voltage and the first voltage threshold;

[0019] a capacitor voltage detection unit connected to the energy storage capacitor in the third energy storage circuit, the capacitor voltage detection unit being used to detect a second voltage in the energy storage capacitor;

[0020] A capacitor voltage judgment unit, wherein the first end of the capacitor voltage judgment unit is connected to the capacitor voltage detection unit, and the second end of the capacitor voltage judgment unit is connected to the second switching switch. The capacitor voltage judgment unit is used to compare the second voltage with the second voltage threshold, and to control the first switching switch to be in the on state or the off state according to the second comparison result; the second comparison result is the comparison result between the second voltage and the second voltage threshold.

[0021] According to various embodiments disclosed in this application, in a fourth aspect, a power supply protection device is provided, the device comprising:

[0022] Detection module, used to detect the voltage signal on the server input bus;

[0023] A control module is used to reversely power the server based on a first voltage in multiple capacitors in the first energy storage circuit and / or a second voltage in the energy storage capacitor in the third energy storage circuit when the voltage on the input bus is less than or equal to a first voltage threshold.

[0024] According to the various embodiments disclosed in the present application, in a fifth aspect, a server is provided, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, computer instructions being stored in the memory, and the processor executing the power supply protection method of the above-mentioned second aspect or any corresponding embodiment thereof by executing the computer instructions.

[0025] According to various embodiments disclosed in the present application, in a sixth aspect, a non-volatile computer-readable storage medium is provided, on which computer instructions are stored, and the computer instructions are used to enable a computer to execute the power supply protection method of the above-mentioned second aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] FIG1 is a schematic structural diagram of a power-off holding circuit according to an embodiment of the present application;

[0028] FIG2 is a schematic structural diagram of another power-off holding circuit according to an embodiment of the present application;

[0029] FIG3 is a schematic structural diagram of another power-off holding circuit according to an embodiment of the present application;

[0030] FIG4 is a schematic structural diagram of another power-off holding circuit according to an embodiment of the present application;

[0031] FIG5 is a flow chart of a power supply protection method according to an embodiment of the present application;

[0032] FIG6 is a flow chart of another power supply protection method according to an embodiment of the present application;

[0033] FIG7 is a schematic structural diagram of a power supply control circuit according to an embodiment of the present application;

[0034] FIG8 is a schematic structural diagram of another power supply control circuit according to an embodiment of the present application;

[0035] FIG9 is a timing diagram of reverse power supply for a server according to an embodiment of the present application;

[0036] FIG10 is a power supply protection device according to an embodiment of the present application;

[0037] FIG11 is a schematic diagram of the hardware structure of a server according to an embodiment of the present application;

[0038] FIG12 is a schematic structural diagram of a non-volatile computer-readable storage medium according to an embodiment of the present application.

[0039] Figure numerals: 10: first energy storage circuit; 20: second energy storage circuit; 30: third energy storage circuit; 11: multiple capacitors; 21: magnetic core; 40: magnetic excitation saturation control module; 710: first drive circuit; 720: input voltage detection unit; 730: input voltage judgment unit; 711: first power supply; 712: first switching switch; 713: second switching switch; 714: first control drive unit; 715: first delay unit; 716: second control drive unit; 740: capacitor voltage detection unit; 750: capacitor voltage judgment unit; 760: second drive circuit; 761: second power supply; 762: third switching switch; 763: fourth switching switch; 764: second delay unit; 765: third control drive unit. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0041] In related technologies, in order to ensure that the server has a power-off retention time, a large-capacitance electrolytic capacitor is connected in parallel to the input end of the server's DC switching power supply. When the server input voltage drops abnormally or fails, the large-capacitance electrolytic capacitor can be used to power the server, thereby meeting the server's power-off retention time requirement.

[0042] However, these capacitors are too large, typically accounting for approximately one-quarter of the server power supply's overall volume. As output power increases, this volume increases to one-third to meet the necessary requirements. This has severely hampered the development of high-efficiency, high-power density server power supplies. Furthermore, when the server input voltage drops abnormally or a fault occurs, the large difference between the server's internal voltage and the voltage released by the large-capacitance electrolytic capacitors can cause a large inrush current into the server, compromising server safety.

[0043] In view of this, in an embodiment of the present application, a power-off holding circuit is provided, comprising: a first energy storage circuit, comprising a plurality of capacitors connected in parallel, the plurality of capacitors being used to store energy according to the input bus voltage of the server, and to reversely supply power to the server; a second energy storage circuit, comprising an inductor and a first switch tube, the inductor and the first switch tube being sequentially connected in series between the positive pole of the input bus and the negative pole of the input bus, the inductor being used to store energy to boost the voltage to a target voltage; a third energy storage circuit, comprising a second switch tube and an energy storage capacitor, the second switch tube and the energy storage capacitor being sequentially connected in series between the inductor and the negative pole of the input bus, the inductor being used to charge the energy storage capacitor, and the energy storage capacitor being used to reversely supply power to the server. Through the power-off holding circuit provided in the present application, energy can be stored according to the voltage of the server input bus respectively through multiple energy storage circuits, and then when the server input voltage drops abnormally or fails, the input bus fluctuating voltage can be smoothed, thereby meeting the requirement of providing power-off holding time for the server while ensuring the safety of the server.

[0044] This embodiment provides a power-off holding circuit, as shown in FIG1 , including: a first energy storage circuit 10 , a second energy storage circuit 20 and a third energy storage circuit 30 .

[0045] The first energy storage circuit 10 includes a plurality of capacitors 11 connected in parallel.

[0046] In the embodiment of the present application, in order to meet the energy storage requirements and avoid the power-off holding circuit being too large, a first energy storage circuit 10 is formed by connecting multiple capacitors 11 in parallel. The multiple capacitors 11 are used to store energy according to the input bus voltage of the server, and when the input voltage on the bus drops abnormally or fails, the server is reversely powered. In addition, the use of multiple capacitors 11 connected in parallel helps to smooth bus voltage fluctuations when the voltage on the input bus drops abnormally or fails, thereby helping to ensure the safety of the server.

[0047] The second energy storage circuit 20 includes an inductor L1 and a first switch tube Q3 , which are sequentially connected in series between the positive electrode of the input bus and the negative electrode of the input bus.

[0048] In the embodiment of the present application, the second energy tank circuit 20 can be understood as a boost circuit. The inductor L1 can boost the voltage flowing into the input bus to a target voltage, so that the third energy tank circuit 30 can pre-store high-voltage electrical energy when the voltage of the input bus is normal, thereby providing sufficient power-off holdover time for the server when powering the server later.

[0049] Furthermore, inductor L1 can be understood as a boost inductor with low power demand and low design difficulty. Its inductance design value takes into account the current limiting characteristic requirements, and can achieve a short-term current limiting function during power-off retention. Then, when switching to energy storage capacitor C3 to power the server through the input bus, it can suppress the surge current caused on the input bus, thereby helping to enhance the reliability of the power-off retention circuit.

[0050] Furthermore, by placing the second energy storage circuit 20 in the power-off holding circuit instead of on the main power branch of the server, the power required by the second energy storage circuit 20 can be reduced, thereby enhancing the reliability of the power-off holding circuit while helping to reduce the volume occupied by the second energy storage circuit 20.

[0051] The third energy storage circuit 30 includes a second switch tube Q4 and an energy storage capacitor C3. The second switch tube Q4 and the energy storage capacitor C3 are sequentially connected in series between the inductor L1 and the negative electrode of the input bus. The inductor L1 is used to charge the energy storage capacitor C3.

[0052] In the embodiment of the present application, the third energy storage circuit 30 is used to store high-voltage electrical energy and to reversely supply power to the server when the input voltage on the busbar drops abnormally or fails. Since the capacitor energy storage satisfies the following energy formula: Therefore, when the energy storage capacitor C3 uses the target voltage to store energy, the stored energy will be higher than the energy required by the server. When the voltage on the input bus drops abnormally or fails, it can provide the required energy supply for the server, thereby helping to provide the server with sufficient power-off retention time.

[0053] The power-off holding circuit provided in this embodiment can store energy according to the voltage of the server input bus through multiple energy storage circuits when the server input voltage is in a normal state. It can also reversely supply power to the server through the first energy storage circuit and / or the second energy storage circuit when the server input voltage drops abnormally or fails, thereby effectively reducing the surge current on the input bus. While meeting the requirement of providing power-off holding time for the server, it can also ensure the safety of the server. It occupies a small volume, which helps to ensure the development of high efficiency and high power density of server power supplies.

[0054] As shown in Figure 2, multiple capacitors 11 include a first capacitor C1 and a second capacitor C2 connected in parallel with the first capacitor C1; the first energy storage circuit 10 also includes: a third switch tube Q1 and a diode D1. The first capacitor, the second capacitor and the third switch tube Q1 are connected in series between the positive pole of the input bus and the negative pole of the input bus in sequence. In actual applications, the source of the third switch tube Q1 can be connected to the output ends of the multiple capacitors 11 (the first capacitor C1 and the second capacitor C2), and the drain of the third switch tube Q1 can be connected to the negative pole of the input bus; the drain of the third switch tube Q1 can also be connected to the output ends of the multiple capacitors 11 (the first capacitor C1 and the second capacitor C2), and the source of the third switch tube Q1 can be connected to the negative pole of the input bus. The specific series connection method depends on the use requirements and is not limited in this application.

[0055] Diode D1, the positive electrode of diode D1 is connected to the negative electrode of the input bus. The second capacitor C2 is connected in series between the positive electrode of the input bus and the negative electrode of diode D1. The charging or discharging state of multiple capacitors 11 can be controlled by the third switch tube Q1, and then the multiple capacitors 11 can be targetedly controlled according to the voltage state of the input bus. By setting the diode D1, it can be ensured that when the first energy storage circuit 10 supplies power to the server through the input bus, the multiple capacitors 11 are always in a discharged state, thereby avoiding the occurrence of reverse power supply, which helps to extend the power-off holding time.

[0056] In some optional embodiments, the first capacitor C1 and the second capacitor C2 are used to store energy according to the input bus voltage of the server when the third switch tube Q1 is in the on state; the first capacitor C1 and the second capacitor C2 are also used to reverse power the server when the third switch tube Q1 is in the off state and the diode D1 is in the unidirectional conduction state.

[0057] Specifically, when the third switch Q1 is in the on state, the first energy tank circuit 10 is connected in series between the positive electrode of the input bus and the negative electrode of the input bus, thereby being able to store energy according to the input bus voltage of the server. Furthermore, when the input bus continuously supplies power to the first capacitor C1 and the second capacitor C2, when the first capacitor C1 and the second capacitor C2 are in a saturated state, they can be equivalent to the voltage of the input bus, thereby being able to supply power to the inductor L1 or the energy storage capacitor C3.

[0058] When the third switch tube Q1 is in the off state and the diode D1 is in the unidirectional conduction state, the multiple capacitors 11 are in the discharge state and can provide reverse power to the server to maintain the power demand on the server load side.

[0059] Moreover, in this case, since the multiple capacitors 11 cannot continue to charge, the energy and time of the surge current on the input bus can be greatly reduced when the power supply circuit is switched to the first energy storage circuit to reversely supply power to the server, thereby solving the problem that the energy storage capacitor C3 cannot be directly switched in parallel to the input bus.

[0060] Furthermore, the presence of diode D1 in first tank circuit 10 maintains a constant discharge path, reducing the time required for instantaneous switching of storage capacitor C3, thereby helping to ensure the reliability of switching state determination. Diode D1 is also used to provide sufficient input load holding energy during power-off switching.

[0061] In some other optional implementations, when the third switch tube Q1 is in the on state, the first switch tube Q3 and the second switch tube Q4 are alternately turned on according to a specified duty cycle to allow the inductor L1 to charge the energy storage capacitor C3.

[0062] Specifically, when the third switch tube Q1 is in the on state, the first switch tube Q3 and the second switch tube Q4 are alternately turned on according to a specified duty cycle period to charge the energy storage capacitor C3 through the inductor L1. For example: a single specified duty cycle includes a first duty cycle and a second duty cycle, and the execution period of the first duty cycle is earlier than the execution period of the second duty cycle. The first duty cycle is used to control whether the first switch tube Q3 is in the on state, and the second duty cycle is used to control whether the second switch tube Q4 is in the on state. Since the target voltage of the energy storage capacitor C3 is provided by the inductor L1, and when the first switch tube Q3 and the second switch tube Q4 are in the on state at the same time, the energy storage capacitor C3 will be short-circuited. Therefore, to ensure that the inductor L1 can charge the energy storage capacitor C3 at the target voltage through the second switch tube Q4, the first switch tube Q3 and the second switch tube Q4 are controlled to be turned on alternately. By taking advantage of the large internal resistance and slow self-discharge of the energy storage capacitor, the second energy storage circuit 20 can be controlled to enter the standby shutdown and self-discharge state for a long time, thereby reducing the overall light-load power consumption of the power supply and at the same time reducing the electromagnetic interference problem of the power supply caused by the addition of high-frequency circuits.

[0063] In one or more implementation scenarios, the alternating frequency between the first switching transistor Q3 and the second switching transistor Q4 can be within a range of 300 kHz to 500 kHz, thereby reducing the inductance requirement for the inductor L1 and facilitating its integration with the inductance required for inductive current limiting. Furthermore, integrating the second energy storage circuit with the energy storage capacitor minimizes the number of power devices used, further improving the power density of the power supply.

[0064] As shown in FIG3 , the power-off holding circuit further includes: a current-limiting resistor R1 and a fourth switch transistor Q2; one end of the current-limiting resistor R1 is disposed between the second switch transistor Q4 and the energy storage capacitor C3; and the fourth switch transistor Q2 is connected in series between the other end of the current-limiting resistor R1 and the cathode of the diode D1. When the energy of the first and second capacitors, the second capacitor C2, and the energy storage capacitor C3 is released to the operating undervoltage threshold, the energy storage capacitor C3 can be connected in series with the first and second capacitors and the second capacitor C2 based on the current-limiting resistor R1 and the fourth switch transistor 50 to increase the power supply voltage supplied to the server by the power-off holding circuit via the input bus (for example, after connecting the energy storage capacitor C3 with the first and second capacitors and the second capacitor C2 in series, the voltage output by the power-off circuit can be increased by approximately two times). This ensures that the energy stored in the first and second capacitors, the second capacitor C2, and the energy storage capacitor C3 is fully utilized, helps shorten the power supply switching time, and thus effectively extends the power-off holding time to ensure stable operation of the server.

[0065] In some optional embodiments, when the second switch tube Q4 is in the on state and the first switch tube Q3, the third switch tube Q1 and the fourth switch tube Q2 are all in the off state, the energy storage capacitor C3 is connected in parallel with multiple capacitors 11 to reverse power the server to extend the power-off retention time provided to the server.

[0066] When the first switch tube Q3, the second switch tube Q4, and the third switch tube Q1 are all in the off state, the fourth switch tube Q2 is in the on state, and the diode D1 is in the unidirectional conduction state, the energy storage capacitor C3 is connected in series with the multiple capacitors 11 to reverse power the server, so as to maximize the utilization of the electrical energy in the multiple capacitors 11 and the energy storage capacitor C3, and extend the duration of the power-off hold time provided to the server. Furthermore, when the energy storage capacitor C3 is connected in series with the multiple capacitors 11 to release energy, the server power supply circuit can be switched to the power-off hold circuit to power the server. By cutting off the large capacitor on the input bus, it is ensured that there are no large-capacity energy storage capacitors on the input bus branch. As a result, when the power supply circuit is switched, the surge energy on the input bus is small and the duration is short. In addition, the current limiting resistor R1 also has a current limiting function, thereby effectively ensuring the safety of reverse power supply to the server.

[0067] As shown in Figure 4, the inductor L1 is an energy storage current limiting coil; the second energy storage circuit 20 also includes: a magnetic excitation saturation control module 40, an excitation saturation coil L2, and a magnetic core 21; the energy storage current limiting coil L1, the magnetic core 21, and the excitation saturation coil L2 constitute a coupled inductor; the magnetic excitation saturation control module 40 is used to control the current in the excitation saturation coil L2, and the current is used to control the energy storage current limiting coil L1 to be in a current limiting state or to control the energy storage current limiting coil to be in a saturation state. By utilizing the principle of magnetic integration to control the charge and discharge state of the energy storage capacitor C3, the design difficulty is low. Not only can the energy storage current limiting coil L1 have a short-term current limiting function when power is lost, but it can also suppress the surge current generated on the input bus when the energy storage capacitor C3 switches to the main power path.

[0068] In some optional embodiments, when the second switch tube Q4 is in the on state and the third switch tube Q1 is in the off state, the energy storage current limiting coil L1 is used to charge the energy storage capacitor C3 in the current limiting state; when the second switch tube Q4 is in the on state, the third switch tube Q1 is in the off state, and the diode D1 is in the unidirectional conduction state, the energy storage capacitor C3 is used to reversely power the server when the energy storage current limiting coil L1 is in the saturation state. Because the self-discharge rate of the energy storage capacitor C3 is slow, it is possible to control whether the energy storage current limiting coil L1 is in the inductor saturation state and whether the energy storage capacitor C3 is in the self-discharge state, thereby reducing the inductance requirements of the inductor L1 and facilitating the integrated design of the inductance required for the current limiting of the inductor L1; at the same time, entering the off self-discharge state for a long time can enable the second energy storage circuit to reduce the overall light-load power consumption of the power supply and reduce the electromagnetic interference problem of the power supply caused by the addition of high-frequency circuits, thereby helping to enhance the stability of the server.

[0069] Moreover, when the energy storage capacitor C3 is switched to the main power path of the server, by controlling the current of the excitation saturation coil L2, the energy storage current limiting coil L1 is triggered to be in a saturated state, and the energy storage capacitor C3 can also be completely connected in parallel to the input bus path. The current in the capacitor on the input bus can release energy by flowing through the diode D1, thereby providing power supply maintenance service for the server.

[0070] The power-off holding circuit provided in this application can not only store energy when the voltage of the input bus is in a normal state, but also provide the server with the necessary power-off holding time when the input voltage drops abnormally or a fault occurs, assist the server in reporting the fault and storing necessary information, and be able to switch to the backup power supply in time, making it more applicable and reliable.

[0071] Based on the same inventive concept, the present application also provides a power supply protection method, which is applied to any power-off holding circuit provided in the present application, including: detecting the voltage on the server input bus; when the voltage on the input bus is less than or equal to a first voltage threshold, reversely supplying power to the server based on the first voltage in the multiple capacitors in the first energy storage circuit, and / or reversely supplying power to the server based on the second voltage in the energy storage capacitor in the third energy storage circuit. The power supply protection method provided in the present application can smooth the fluctuating voltage of the input bus when the voltage on the server input bus drops abnormally or fails, thereby providing the server with the required power-off holding time while ensuring the safety of the server.

[0072] According to an embodiment of the present application, an embodiment of a power supply protection method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0073] In this embodiment, a power supply protection method is provided. The execution subject may be a server or a baseboard management controller (BMC) deployed inside the server. FIG5 is a flow chart of the power supply protection method according to the embodiment of the present application. As shown in FIG5 , the flow chart includes the following steps:

[0074] Step S501: Detect the voltage on the server input bus.

[0075] In the embodiment of the present application, the purpose of detecting the voltage on the input bus is to determine whether the current voltage on the input bus is normal and whether it can normally power the server.

[0076] Step S502: When the voltage on the input bus is less than or equal to a first voltage threshold, reverse power is supplied to the server based on the first voltage in the plurality of capacitors in the first energy storage circuit, and / or the second voltage in the energy storage capacitor in the third energy storage circuit.

[0077] In the embodiment of the present application, the first voltage threshold can be understood as a warning voltage, that is, the minimum voltage value to maintain normal operation of the server. If the voltage on the input bus is less than or equal to the first voltage threshold, it indicates that the voltage on the server input bus is abnormal or has dropped. Therefore, to ensure that the server can switch the power supply circuit in time, the server is reversely powered based on the first voltage in the multiple capacitors in the first energy storage circuit and / or the second voltage in the energy storage capacitor in the third energy storage circuit, so as to provide the server with power failure holdover time.

[0078] The power supply protection method provided in this embodiment can smooth the fluctuating voltage of the input bus when the server input voltage drops abnormally or fails, thereby providing the server with the required power-off holding time and ensuring the safety of the server.

[0079] In some optional embodiments, multiple capacitors include a first capacitor and a second capacitor connected in parallel with the first capacitor; the first energy storage circuit also includes: a third switching tube and a diode; the first capacitor and the third switching tube are connected in series between the positive pole of the input bus and the negative pole of the input bus; a diode, the positive pole of the diode is connected to the negative pole of the input bus; the second capacitor is connected in series between the positive pole of the input bus and the negative pole of the diode.

[0080] In some optional implementation scenarios, when the voltage on the input bus is equal to a first voltage threshold, the process of reversely powering the server based on the first voltage in multiple capacitors in the first energy storage circuit can be as follows: when the voltage on the input bus is equal to the first voltage threshold and the second voltage in the energy storage capacitor is equal to the second voltage threshold, the third switch tube is controlled to be in an off state, so as to reversely power the server based on the first voltage in the first capacitor and the second capacitor when the diode is in a unidirectional conduction state.

[0081] Specifically, when the voltage on the input bus is equal to the first voltage threshold, it indicates that the voltage on the input bus is in a low voltage state. The second voltage threshold can be understood as the maximum voltage value when the energy storage capacitor is in a saturated state. When the second voltage is equal to the second voltage threshold, it can be determined that the energy storage capacitor is currently in a saturated state. Therefore, in order to prevent the voltage on the input bus from gradually decreasing, the third switch tube is controlled to be in a disconnected state, so that when the diode is in a unidirectional conduction state, the server is reversely powered based on the first voltage in the first capacitor and the second capacitor to smooth the voltage on the input bus, thereby ensuring normal power supply to the server load.

[0082] In some optional implementation scenarios, when the voltage on the input bus is equal to the first voltage threshold, the process of reverse powering the server based on the first voltage in multiple capacitors in the first energy storage circuit and the second voltage in the energy storage capacitor in the third energy storage circuit can be as follows: when the voltage on the input bus is less than the first voltage threshold, the voltage on the input bus is greater than the third voltage threshold, and the second voltage is equal to the second voltage threshold, then the third switch tube is controlled to be in the off state for a first period of time, and the second switch tube in the third energy storage circuit is controlled to be in the on state, and when the first switch tube in the second energy storage circuit is in the off state and the diode is in the unidirectional conduction state, multiple capacitors are controlled to be connected in parallel with the energy storage capacitor, and the server is reverse powered by the first voltage and the second voltage.

[0083] Specifically, the third voltage threshold can be understood as the minimum voltage value when multiple capacitors are in an undervoltage state. When the voltage on the input bus is less than the first voltage threshold, the voltage on the input bus is greater than the third voltage threshold, and the second voltage is equal to the second voltage threshold, it indicates that the voltage on the input bus is gradually decreasing, but the first voltage in the multiple capacitors has not yet reached the undervoltage state. Therefore, in order to reduce the inrush current on the input bus, it can meet the demand of providing power-off retention time for the server while ensuring the safety of the server, then the third switch tube is controlled to be in the off state for a first time period, and the second switch tube in the third energy storage circuit is controlled to be in the on state, and when the first switch tube in the second energy storage circuit is in the off state and the diode is in the unidirectional conduction state, the first voltage and the second voltage are used to reverse power the server. At this time, multiple capacitors and energy storage capacitors are connected in parallel.

[0084] In other optional embodiments, the power-off holding circuit further includes: a current limiting resistor and a fourth switch tube; one end of the current limiting resistor is arranged between the second switch tube and the energy storage capacitor; the fourth switch tube is connected in series between the other end of the current limiting resistor and the negative electrode of the diode.

[0085] In some optional implementation scenarios, when the voltage on the input bus is less than a first voltage threshold, a process of reversely powering the server based on the first voltage in the plurality of capacitors in the first energy tank circuit and the second voltage in the energy storage capacitor in the third energy tank circuit may be as follows:

[0086] When the voltage on the input bus is equal to the third voltage threshold, the second voltage is less than the second voltage threshold and the second voltage is greater than the fourth voltage threshold, then the plurality of capacitors are continued to be controlled in parallel with the energy storage capacitor, and the first voltage and the second voltage are used to reversely power the server. The fourth voltage threshold can be understood as the minimum voltage value when the energy storage capacitor is in an undervoltage state. When the voltage on the input bus is equal to the third voltage threshold, the second voltage is less than the second voltage threshold and the second voltage is greater than the fourth voltage threshold, it indicates that the plurality of capacitors are in an undervoltage state, their own voltage is insufficient, but the voltage in the energy storage capacitor is relatively sufficient. Therefore, the plurality of capacitors are continued to be controlled in parallel with the energy storage capacitor, and the first voltage and the second voltage are used to reversely power the server.

[0087] When the voltage on the input bus is equal to a third voltage threshold and the second voltage is equal to a fourth voltage threshold, the second switch is controlled to be in an off state. After the second switch is in an off state for a second duration, the fourth switch is controlled to be in an on state. When the first and third switches are both in an off state and the diode is in a unidirectional conduction state, multiple capacitors and an energy storage capacitor are controlled to be connected in series, and the first and second voltages are used to reverse power the server. When the voltage on the input bus is equal to the third voltage threshold and the second voltage is equal to the fourth voltage threshold, it indicates that the multiple capacitors and the energy storage capacitor are all in an undervoltage state. Therefore, to maximize the utilization of the voltages within the multiple capacitors and the energy storage capacitor, the second switch is controlled to be in an off state. After the second switch is in an off state for a second duration, the fourth switch is controlled to be in an on state. When the first and third switches are both in an off state and the diode is in a unidirectional conduction state, the multiple capacitors and the energy storage capacitor are controlled to be connected in series, and the first and second voltages are used to reverse power the server, thereby releasing as much stored energy as possible in the multiple capacitors and the energy storage capacitor and extending the power-off holdover time.

[0088] In this embodiment, a power supply protection method is provided. The execution subject may be a server or a BMC deployed inside the server. FIG6 is a flow chart of the power supply protection method according to the embodiment of the present application. As shown in FIG6 , the flow includes the following steps:

[0089] Step S601: Detect the voltage on the server input bus. Detailed descriptions refer to the descriptions of the corresponding steps in the above embodiment, which will not be repeated here.

[0090] In step S602, when the voltage on the input bus is less than or equal to a first voltage threshold, reverse power is supplied to the server based on a first voltage within the plurality of capacitors in the first energy tank circuit, and / or a second voltage within the energy storage capacitors in the third energy tank circuit. For detailed descriptions, refer to the descriptions of the corresponding steps in the above embodiment and are not repeated here.

[0091] Step S603: If the voltage on the input bus is greater than the first voltage threshold, the third switch in the first energy storage unit is controlled to be in an on state to control the multiple capacitors to store energy according to the voltage.

[0092] In an embodiment of the present application, when the voltage on the input bus is greater than the first voltage threshold, it indicates that the server is currently being powered. Therefore, the third switch tube in the first energy storage unit is controlled to be in the on state to control multiple capacitors to store energy according to the voltage on the input bus, so that when the input voltage drops abnormally or fails, the electric energy stored in multiple capacitors can be used to power the server load, and the voltage on the input bus can be smoothed when multiple capacitors are used to power the server through the input bus.

[0093] Step S604: After the third switch tube is in the on state for a third time period, the first switch tube in the second energy tank circuit is controlled to be in the on state, so as to control the inductor in the second energy tank circuit to store energy in the energy storage capacitor.

[0094] In this embodiment of the present application, when the third switch is in the on state for a third duration, the input bus can stably supply power to the server. Furthermore, when the third switch is in the on state, the first switch in the second energy tank circuit is controlled to be in the on state, thereby controlling the inductor in the second energy tank circuit to store energy in the energy storage capacitor. The inductor is used to store energy to boost the voltage on the bus to a target voltage.

[0095] In some optional embodiments, the second energy storage circuit can be controlled to store energy for the energy storage capacitor in the following manner: the first switch tube and the second switch tube in the third energy storage circuit are controlled to be alternately turned on according to a specified duty cycle period to charge the energy storage capacitor through the inductor, thereby helping to balance the stored energy of the second energy storage circuit and the third energy storage circuit, avoiding excessive loss of electrical energy, and helping to ensure the stability of the power-off retention circuit.

[0096] The power supply protection method provided in this embodiment controls the energy storage of the first energy storage circuit or the third energy storage circuit in the power-off holding circuit when the voltage on the server input bus is in a normal state. When the voltage on the input bus drops abnormally or a fault occurs, the fluctuating voltage of the input bus can be smoothed, thereby meeting the requirement of providing power-off holding time for the server while ensuring the safety of the server.

[0097] In some optional implementations, the power supply protection method further includes:

[0098] Step S605 , detecting whether the second voltage in the energy storage capacitor is equal to the second voltage threshold.

[0099] In the embodiment of the present application, detecting whether the second voltage in the energy storage capacitor is equal to the second voltage threshold is used to detect whether the energy storage capacitor reaches a saturation state during the energy storage process.

[0100] In step S606, if the second voltage is equal to the second voltage threshold, the second switch tube is controlled to be continuously in the on state, and the first switch tube is controlled to be continuously in the off state, so that when the diode of the first energy storage circuit is in the unidirectional conduction state, the energy storage capacitor is in the discharge state.

[0101] In the embodiment of the present application, the characteristics of the energy storage capacitor with large internal resistance and slow self-discharge are utilized to control the second energy storage circuit to enter the standby off self-discharge state for a long time, thereby avoiding the energy storage capacitor from being in the energy storage state continuously, thereby reducing the overall light-load power consumption of the power supply and reducing the power supply electromagnetic interference problem caused by the addition of high-frequency circuits.

[0102] Step S607: When the second voltage is equal to the fifth voltage threshold, the first switch tube is controlled to be in the on state, and the second switch tube is controlled to be continuously in the off state, so as to control the inductor in the second energy storage circuit to continue to supply power to the energy storage capacitor.

[0103] In the embodiment of the present application, the fifth voltage threshold can be understood as the minimum overvoltage value of the energy storage capacitor. During the discharge process of the energy storage capacitor, when the second voltage equals the fifth voltage threshold, the voltage of the energy storage capacitor has reached the critical value. To avoid untimely reverse power supply and excessive charging time, the first switch tube is controlled to be in the on state and the second switch tube is controlled to be continuously in the off state, so that the inductor in the second energy tank circuit continues to power the energy storage capacitor.

[0104] The power supply protection method provided in this embodiment can meet the requirement of providing a power-off holding time for the server while avoiding excessive power loss, thereby helping to ensure the stability of the power-off holding circuit.

[0105] In some optional embodiments, the inductor is an energy storage current limiting coil; the second energy storage circuit also includes: a magnetic excitation saturation control module, an excitation saturation coil and a magnetic core; the energy storage current limiting coil, the magnetic core and the excitation saturation coil constitute a coupled inductor; the magnetic excitation saturation control module is used to control the current in the excitation saturation coil, and the current is used to control the energy storage current limiting coil to be in a current limiting state or to control the energy storage current limiting coil to be in a saturation state, thereby reducing the inductance requirement of the inductor and facilitating the integrated design with the inductance required for inductor current limiting; at the same time, entering the shutdown self-discharge state for a long time can enable the second energy storage circuit to reduce the overall light-load power consumption of the power supply, and reduce the power supply electromagnetic interference problem caused by adding high-frequency circuits, thereby helping to enhance the stability of the server.

[0106] Specifically, when the second switch tube is in the on state and the third switch tube is in the off state, the energy storage current limiting coil is used to charge the energy storage capacitor in the current limiting state; when the second switch tube is in the on state, the third switch tube is in the off state and the diode is in the unidirectional conduction state, the energy storage capacitor reversely supplies power to the server when the energy storage current limiting coil is in the saturation state.

[0107] Based on the same inventive concept, the present application also provides a power supply control circuit, which is used to control the above-mentioned power-off holding circuit to reversely supply power to the server. As shown in Figure 7, the power supply control circuit includes:

[0108] The first drive circuit 710 includes a first power supply 711, a first switch 712, a second switch 713, a first control drive unit 714 for the third switch tube, a first delay unit 715, and a second control drive unit 716 for the second switch tube. The first power supply 711, the first switch 712, the second switch 713, the first delay unit 715, and the second control drive unit 716 are connected in series in sequence. The first control drive unit 714 is connected between the second switch 713 and the first delay unit 715. The first power supply 711 is used to power the first drive circuit 710. The first control drive unit 714 is used to control the third switch tube to be in an on state, or the first control drive unit 714 is used to control the third switch tube to be in an off state, and the second control drive unit 716 is used to control the second switch tube to be in an on state.

[0109] In the embodiment of the present application, the first driving circuit 710 is used to control whether multiple capacitors and energy storage capacitors are connected in parallel to provide reverse power to the server.

[0110] The input voltage detection unit 720 is connected to the input bus and is used to detect the voltage on the input bus.

[0111] In the embodiment of the present application, in order to determine whether the voltage on the input bus is abnormal, the input voltage detection unit 720 may be used for detection.

[0112] An input voltage judgment unit 730, wherein the first end of the input voltage judgment unit 730 is connected to the input voltage detection unit, and the second end of the input voltage judgment unit 730 is connected to the second switching switch 713. The input voltage judgment unit 730 is used to compare the first voltage in the plurality of capacitors in the first energy storage circuit with the first voltage threshold, and to control the second switching switch 713 to be in an on state or an off state according to the first comparison result, wherein the first comparison result is a comparison result between the first voltage and the first voltage threshold.

[0113] In an embodiment of the present application, the input voltage judgment unit 730 is used to control whether the second switching switch 713 is in the on state or the off state according to the size between the first voltage and the first voltage threshold, thereby determining whether the first control circuit can be in the on state.

[0114] The capacitor voltage detection unit 740 is connected to the energy storage capacitor in the third energy storage circuit. The capacitor voltage detection unit 740 is used to detect the second voltage in the energy storage capacitor.

[0115] In the embodiment of the present application, the capacitor voltage detection unit 740 can detect whether the energy storage capacitor has reached a saturation state.

[0116] The capacitor voltage judgment unit 750, the first end of the capacitor voltage judgment unit 750 is connected to the capacitor voltage detection unit 740, the second end of the capacitor voltage judgment unit 750 is connected to the first switching switch 712, the capacitor voltage judgment unit 750 is used to compare the size between the second voltage and the second voltage threshold, and to control the first switching switch 712 to be in the on state or to control the first switching switch 712 to be in the off state according to the second comparison result; the second comparison result is the comparison result between the second voltage and the second voltage threshold.

[0117] In an embodiment of the present application, the capacitor voltage judgment unit 750 is used to control whether the first switching switch 712 is in the on state or the off state according to the size between the second voltage and the second voltage threshold, and then jointly determine with the second switching switch 713 whether the first driving circuit 710 can be in the on state.

[0118] In the power supply control circuit provided in this application, when the voltage on the input bus drops abnormally or fails, hardware control can be used to provide power-off protection time for the server in a timely manner, thereby achieving the purpose of power-off retention.

[0119] As shown in FIG8 , the power supply control circuit further includes a second drive circuit 760. The second drive circuit 760 includes a second power supply 761, a third switch 762, a fourth switch 763, a second control drive unit 716, a second delay unit 764, and a third control drive unit 765 for the fourth switch tube. The second power supply 761, the third switch 762, the fourth switch 763, the second delay unit 764, and the third control drive unit 765 are connected in series in sequence. The second control drive unit 716 is connected between the third switch 762 and the second delay unit 764. The second power supply 761 is used to supply power to the second drive circuit 760. The second control drive unit 716 is also used to control the second switch tube to be in the off state, and the third control drive unit 765 is used to control the fourth switch tube to be in the on state.

[0120] In the embodiment of the present application, the second driving circuit 760 is used to control whether multiple capacitors and energy storage capacitors are connected in series to provide reverse power to the server.

[0121] The second end of the input voltage judgment unit 730 is also connected to the fourth switch 763. The input voltage judgment unit 730 is further used to control the fourth switch 763 to be in the on state or to control the fourth switch 763 to be in the off state according to the first comparison result.

[0122] In an embodiment of the present application, the input voltage judgment unit 730 can control the on-off state of the second switching switch 713 and the fourth switching switch 763 respectively according to the size between the first voltage and the first voltage threshold, thereby achieving the purpose of separately controlling the third switch tube and the second switch tube.

[0123] The second end of the capacitor voltage judgment unit 750 is also connected to the third switch 762. The capacitor voltage judgment unit 750 is further used to control the third switch 762 to be in the on state or to control the third switch 762 to be in the off state according to the second comparison result.

[0124] In an embodiment of the present application, the input voltage judgment unit 730 can control the on-off state of the first switching switch 712 and the third switching switch 762 respectively according to the size between the second voltage and the second voltage threshold, thereby achieving the purpose of separately controlling the second switch tube and the fourth switch tube.

[0125] In some optional implementation scenarios, when the first comparison result shows that the first voltage is greater than the first voltage threshold, the input voltage determination unit 730 controls the second switch 713 to be in the on state, so as to send the first control signal to the second control drive unit 716, and the second control drive unit 716 controls the third switch tube to be in the on state according to the first control signal;

[0126] When the first comparison result shows that the first voltage is equal to the first voltage threshold, the input voltage determination unit 730 controls the second switch 713 to be in the on state, so as to send the second control signal to the second control driving unit 716. The second control driving unit 716 controls the third switch tube to be in the off state according to the second control signal.

[0127] When the first comparison result shows that the first voltage is less than the first voltage threshold and the first voltage is greater than the third voltage threshold, the input voltage determination unit 730 controls the second switch 713 to be in an off state, so as to keep the third switch tube in an off state.

[0128] When the first comparison result is that the first voltage is equal to the third voltage threshold, the input voltage judgment unit 730 controls the fourth switching switch 763 to be in the on state to send the third control signal to the second control driving unit. The third control signal is used to control the second switch tube to be in the off state.

[0129] In some other optional implementation scenarios, when the second comparison result is that the second voltage is equal to the second voltage threshold, the capacitor voltage judgment unit 750 controls the first switch 712 to be in the on state, so as to send the fourth control signal to the second control driving unit 716 through the first delay unit 715. The second control driving unit 716 controls the second switch tube to be in the on state according to the fourth control signal. The first delay unit 715 is used to delay the fourth control signal for a first time length before sending it to the second control driving unit.

[0130] When the second comparison result shows that the second voltage is less than the first voltage threshold and greater than the fourth voltage threshold, the capacitor voltage determination unit 750 controls the first switch 712 to be in the on state, and the second control driving unit 716 continuously controls the second switch tube to be in the on state according to the fourth control signal;

[0131] When the second comparison result is that the second voltage is less than or equal to the fourth voltage threshold, the capacitor voltage judgment unit 750 controls the first switching switch 712 to be in the off state to stop sending the fourth control signal to the second control drive unit 716, and controls the third switching switch 762 to be in the on state to send the fifth control signal to the third control drive unit 765 through the second delay unit 764. The fifth control signal is used to control the third switching switch 762 to be in the on state, and the second delay unit 764 is used to delay the fifth control signal for a second time length before sending it to the third control drive unit 765.

[0132] The power supply control circuit provided in this application helps to quickly determine the voltage status of multiple capacitors and energy storage capacitors through voltage comparison, which in turn helps to switch circuits in a timely manner and smooth the fluctuating voltage of the input bus, thereby extending the power-off protection time.

[0133] In some further optional implementation scenarios, when both the first switch 712 and the second switch 713 are in the on state, the first driver circuit 710 is in the on state; and when both the third switch 762 and the fourth switch 763 are in the on state, the second driver circuit 760 is in the on state. The on states of the first driver circuit 710 and the second driver circuit 760 are mutually exclusive. That is, when the first driver circuit 710 is in the on state, the second driver circuit 760 is always in the off state; however, when the first driver circuit 710 is in the off state, the second driver circuit 760 is not necessarily in the off state. When the second driver circuit 760 is in the on state, the first driver circuit 710 is always in the off state; however, when the second driver circuit 760 is in the off state, the first driver circuit 710 is not necessarily in the off state. This allows for targeted control of the power-off hold circuit based on the states of the first and second voltages, thereby rationally utilizing the first and second voltages and effectively extending the power-off protection duration, enabling the server to achieve power-off hold.

[0134] In some further optional implementation scenarios, when the third switch tube and the second switch tube are both in the on state, and the first switch tube and the fourth switch tube in the second energy storage circuit are both in the off state, the multiple capacitors are connected in parallel with the energy storage capacitor;

[0135] When the second switch tube and the fourth switch tube are both in the on state, and the first switch tube and the third switch tube are both in the off state, the multiple capacitors are connected in series with the energy storage capacitor.

[0136] Using the above power supply control circuit to control the power-off holding circuit to reversely power the server helps shorten the control time, achieve fast switching, and quickly respond to the power demand on the load side, thereby helping to improve efficiency and ensuring that the server needs sufficient power-off protection time.

[0137] In some further optional implementation scenarios, the power-off holding circuit shown in FIG4 is combined with the power supply control circuit shown in FIG8 , and the operating sequence of controlling the power-off holding circuit to reversely supply power to the server can be as shown in FIG9 :

[0138] 1) The input voltage determination unit determines whether the voltage on the input bus has dropped to a first voltage threshold. When the voltage on the input bus has dropped to the first voltage threshold, the second switch 713 is controlled to be in the on state, and a second control signal is sent to the second control drive unit 716. The second control drive unit 716 controls the third switch Q1 to be in the off state according to the second control signal.

[0139] 2) At the same time, the capacitor voltage judgment unit 750 judges that the second voltage of the energy storage capacitor is equal to the second voltage threshold. When the energy storage capacitor is detected to be equal to the second voltage threshold, the first switching switch 712 is controlled to be in the on state, and then the fourth control signal is sent to the second switch tube Q4 through the first delay unit, so that after the third switch tube Q1 is in the off state for a first period of time, the second switch tube Q4 is controlled to be in the on state, and the current in the excitation saturation coil L2 is controlled through the magnetic excitation saturation control module 40 to control the energy storage current limiting coil L1 to be in a saturated state. At this time, the first switching switch 712 and the second switching switch 713 are both in the on state, thereby achieving the purpose of connecting multiple capacitors 11 in parallel with the energy storage capacitor C3, and reversely supplying power to the server when the diode D1 is in a unidirectional conductive state.

[0140] 3) During the discharge of multiple capacitors 11 and the energy storage capacitor C3, the input voltage detection unit 720 detects whether the first voltage reaches the third voltage threshold, and the capacitor voltage detection unit 740 detects whether the second voltage reaches the fourth voltage threshold. If the first voltage does not reach the third voltage threshold and / or the second voltage does not reach the fourth voltage threshold, the multiple capacitors 11 and the energy storage capacitor C3 are kept in parallel, and the server is continuously reversely powered when the diode D1 is in a unidirectional conduction state. Since the discharge path always exists when the voltage on the input bus is in a power-off state, the time requirement for the instantaneous cut-in of the energy storage capacitor can be reduced, thereby ensuring the reliability of the switching state.

[0141] 4) When the input voltage detection unit 720 detects that the first voltage reaches the third voltage threshold, and the capacitor voltage detection unit 740 detects that the second voltage reaches the fourth voltage threshold, the input voltage detection unit 720 controls the fourth switch 763 to be in the on state, and then sends the third control signal to the second control drive unit 716, so that the second control drive unit 716 controls the second switch tube Q4 to be in the off state; the capacitor voltage detection unit 740 controls the first switch 712 to be in the off state, so as to stop sending the fourth control signal to the second control drive unit 716, thereby ensuring that the second switch tube Q4 is in the off state. The capacitor voltage detection unit 740 is also used to control the third switch 762 to be in the on state, so as to send the fifth control signal to the third control drive unit 765 through the second delay unit 764. After the second switch tube Q4 is in the off state for a second period of time, the third control drive unit 765 controls the third switch 762 to be in the on state, thereby achieving the purpose of connecting multiple capacitors 11 and the energy storage capacitor C3 in series, and reversely supplying power to the server when the diode is in a unidirectional conductive state, so as to fully utilize the electrical energy in the multiple capacitors 11 and the energy storage capacitor C3 and extend the power-off retention time provided to the server. In addition, when the energy storage capacitor C3 is connected in series with the multiple capacitors 11 to release energy, the server power supply circuit can be switched to the power-off retention circuit to power the server. By cutting off the large capacitor on the input bus, it is ensured that there is no large-capacity energy storage capacitor on the input bus branch, thereby making the surge energy on the input bus small and short-lived when the power supply circuit is switched, and the current limiting resistor R1 also has a current limiting function, thereby effectively ensuring the safety of reverse power supply to the server.

[0142] In this embodiment, a power supply protection device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments. The details that have been described will not be repeated here. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

[0143] This embodiment provides a power supply protection device, as shown in FIG10 , including:

[0144] The first detection module 1001 is used to detect the voltage signal on the server input bus;

[0145] The first control module 1002 is used to reversely power the server based on the first voltage in the multiple capacitors in the first energy storage circuit and / or the second voltage in the energy storage capacitor in the third energy storage circuit when the voltage on the input bus is less than or equal to the first voltage threshold.

[0146] In some optional embodiments, the plurality of capacitors include a first capacitor and a second capacitor connected in parallel with the first capacitor; the first energy storage circuit further includes: a third switch tube and a diode; the first capacitor and the third switch tube are sequentially connected in series between the positive electrode of the input bus and the negative electrode of the input bus; the diode, the positive electrode of the diode is connected to the negative electrode of the input bus; the second capacitor is connected in series between the positive electrode of the input bus and the negative electrode of the diode;

[0147] The first control module 1002 includes:

[0148] The first control unit is used to control the third switch tube to be in an off state when the voltage on the input bus is equal to the first voltage threshold and the second voltage in the energy storage capacitor is equal to the second voltage threshold, so as to reversely power the server based on the first voltage in the first capacitor and the second capacitor when the diode is in a unidirectional conduction state.

[0149] In some optional implementations, the first control module 1002 further includes:

[0150] The second control unit is used to control the third switch tube to be in an off state for a first period of time when the voltage on the input bus is less than the first voltage threshold, the voltage on the input bus is greater than the third voltage threshold, and the second voltage is equal to the second voltage threshold, and then control the second switch tube in the third energy storage circuit to be in an on state; and when the first switch tube in the second energy storage circuit is in an off state and the diode is in a unidirectional conduction state, control multiple capacitors to be connected in parallel with the energy storage capacitor, so that the server is reversely powered by the first voltage and the second voltage.

[0151] In some optional embodiments, the power-off holding circuit further includes: a current-limiting resistor and a fourth switch tube; one end of the current-limiting resistor is arranged between the second switch tube and the energy storage capacitor; the fourth switch tube is connected in series between the other end of the current-limiting resistor and the cathode of the diode;

[0152] The first control module 1002 further includes:

[0153] a third control unit, configured to, when the voltage on the input bus is equal to a third voltage threshold, the second voltage is less than the second voltage threshold, and the second voltage is greater than a fourth voltage threshold, continue to control the plurality of capacitors to be connected in parallel with the energy storage capacitor, and reversely power the server with the first voltage and the second voltage;

[0154] The fourth control unit is used to control the second switch tube to be in the off state when the voltage on the input bus is equal to the third voltage threshold and the second voltage is equal to the fourth voltage threshold, and after the second switch tube is in the off state for a second period of time, control the fourth switch tube to be in the on state, and when the first switch tube and the third switch tube are both in the off state and the diode is in the unidirectional conduction state, control multiple capacitors and energy storage capacitors to be connected in series, and reverse power the server with the first voltage and the second voltage.

[0155] In some optional embodiments, the device further comprises:

[0156] a fifth control module, configured to control the third switch in the first energy storage unit to be in an on state if the voltage on the input bus is greater than a first voltage threshold, so as to control the plurality of capacitors to store energy according to the voltage;

[0157] The sixth control module is used to control the first switch tube in the second energy storage circuit to be in the on state after the third switch tube is in the on state for a third time period, so as to control the inductor in the second energy storage circuit to store energy in the energy storage capacitor. The inductor is used to store energy to boost the voltage on the input bus to the target voltage.

[0158] In some optional implementations, the second energy storage circuit is controlled to store energy in the energy storage capacitor in the following manner:

[0159] The first switch tube and the second switch tube in the third energy storage circuit are controlled to be alternately turned on according to a specified duty cycle, so as to provide the inductor to charge the energy storage capacitor.

[0160] In some optional embodiments, the device further comprises:

[0161] A second detection module, configured to detect whether a second voltage in the energy storage capacitor is equal to a second voltage threshold;

[0162] a seventh control module, configured to control the second switch tube to be continuously in the on state and the first switch tube to be continuously in the off state if the second voltage is equal to the second voltage threshold, so that the energy storage capacitor is in a discharging state when the diode of the first energy storage circuit is in a unidirectional conduction state;

[0163] The eighth control module is used to control the first switch tube to be in the on state and control the second switch tube to be in the off state when the second voltage is equal to the fifth voltage threshold, so as to control the inductor in the second energy storage circuit to continue to supply power to the energy storage capacitor.

[0164] In some optional embodiments, the inductor is an energy storage current limiting coil; the second energy storage circuit also includes: a magnetic excitation saturation control module, an excitation saturation coil and a magnetic core; the energy storage current limiting coil, the magnetic core and the excitation saturation coil constitute a coupled inductor; the magnetic excitation saturation control module is used to control the current in the excitation saturation coil, and the current is used to control the energy storage current limiting coil to be in a current limiting state or to control the energy storage current limiting coil to be in a saturation state.

[0165] In some optional embodiments, when the second switch tube is in the on state and the third switch tube is in the off state, the energy storage current limiting coil is used to charge the energy storage capacitor in the current limiting state;

[0166] When the second switch tube is in the on state, the third switch tube is in the off state and the diode is in the unidirectional conduction state, the energy storage capacitor supplies reverse power to the server when the energy storage current limiting coil is in the saturation state.

[0167] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0168] The power supply protection device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0169] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0170] An embodiment of the present application also provides a server having the power supply protection device shown in FIG10 above.

[0171] Please refer to Figure 11, which is a structural diagram of a server provided by an optional embodiment of the present application. As shown in Figure 11, the server includes: one or more processors 110, a memory 120, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed in the server, including instructions stored in or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple servers can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 11 takes a processor 110 as an example.

[0172] The processor 110 may be a central processing unit (CPU), a network processor (NPU), or a combination thereof. The processor 110 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device (PLD) may be a complex programmable logic device (CPLD), a field programmable gate array (FPGA), a general purpose array logic (GAL), or any combination thereof.

[0173] The memory 120 stores instructions that can be executed by at least one processor 110, so as to enable at least one processor 110 to execute the method shown in the above embodiment.

[0174] The memory 120 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created based on the use of the server, etc. In addition, the memory 120 may include a high-speed random access memory and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 120 may optionally include a memory remotely located relative to the processor 110, and these remote memories may be connected to the server via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0175] The memory 120 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid-state drive; the memory 120 may also include a combination of the above types of memory.

[0176] The server further includes an input device 130 and an output device 140. The processor 110, the memory 120, the input device 130, and the output device 140 may be connected via a bus or other means, with FIG11 taking the bus connection as an example.

[0177] The input device 130 can receive input digital or character information and generate key signal input related to the user settings and function control of the server, such as a touch screen, a keypad, a mouse, a trackpad, a touch pad, an indicator stick, one or more mouse buttons, a trackball, a joystick, etc. The output device 140 can include a display device, an auxiliary lighting device (e.g., an LED), and a tactile feedback device (e.g., a vibration motor). The above-mentioned display device includes but is not limited to a liquid crystal display, a light emitting diode, a display, and a plasma display. In some optional embodiments, the display device can be a touch screen.

[0178] The embodiment of the present application also provides a non-volatile computer-readable storage medium 1201. The above-mentioned method according to the embodiment of the present application can be implemented in hardware, firmware, or implemented as a computer instruction 1202 that can be recorded in a storage medium, or can be implemented by downloading through a network and originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state drive, etc.; further, the storage medium can also include a combination of the above-mentioned types of memory. It can be understood that a computer, a processor, a microprocessor controller or programmable hardware includes a storage component that can store or receive software or computer instructions. When the software or computer instructions are accessed and executed by a computer, a processor or hardware, the method shown in the above embodiment is implemented.

[0179] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A power-off holding circuit, characterized in that: The power-off holding circuit comprises: A first energy storage circuit, comprising a plurality of capacitors connected in parallel, the plurality of capacitors being used to store energy according to an input bus voltage of the server and to reversely supply power to the server; A second energy storage circuit includes an inductor and a first switch tube, wherein the inductor and the first switch tube are sequentially connected in series between the positive electrode of the input bus and the negative electrode of the input bus, and the inductor is used for storing energy to boost the voltage to a target voltage; and The third energy storage circuit includes a second switch tube and an energy storage capacitor. The second switch tube and the energy storage capacitor are connected in series between the inductor and the negative pole of the input bus. The inductor is used to charge the energy storage capacitor, and the energy storage capacitor reversely supplies power to the server.

2. The power-off holding circuit according to claim 1, characterized in that: The multiple capacitors include a first capacitor and a second capacitor connected in parallel with the first capacitor; the first energy storage circuit also includes: a third switch tube and a diode; The first capacitor and the third switch tube are sequentially connected in series between the positive electrode of the input bus and the negative electrode of the input bus; a diode, wherein the anode of the diode is connected to the cathode of the input bus; and The second capacitor is connected in series between the positive electrode of the input bus and the negative electrode of the diode.

3. The power-off holding circuit according to claim 2, characterized in that: The first capacitor and the second capacitor are used to store energy according to the input bus voltage of the server when the third switch tube is in the on state; and The first capacitor and the second capacitor are further used to provide reverse power to the server when the third switch tube is in an off state and the diode is in a unidirectional conduction state.

4. The power-off holding circuit according to claim 3, characterized in that: When the third switch tube is in the on state, the first switch tube and the second switch tube are alternately turned on according to a specified duty cycle, so that the inductor can charge the energy storage capacitor.

5. The power-off holding circuit according to claim 2, characterized in that: The power-off holding circuit further includes: a current limiting resistor and a fourth switch tube; One end of the current limiting resistor is arranged between the second switch tube and the energy storage capacitor; and The fourth switch tube is connected in series between the other end of the current limiting resistor and the cathode of the diode.

6. The power-off holding circuit according to claim 5, characterized in that: When the second switch tube is in the on state, and the first switch tube, the third switch tube, and the fourth switch tube are all in the off state, the energy storage capacitor is connected in parallel with the multiple capacitors to reversely supply power to the server; as well as When the first switch tube, the second switch tube and the third switch tube are all in the off state, the fourth switch tube is in the on state and the diode is in the unidirectional conduction state, the energy storage capacitor is connected in series with the multiple capacitors to reversely supply power to the server.

7. The power-off holding circuit according to any one of claims 2 to 4, characterized in that: The inductor is an energy storage current limiting coil; the second energy storage circuit also includes: a magnetic excitation saturation control module, a magnetic excitation saturation coil and a magnetic core; The energy storage current limiting coil, the magnetic core and the excitation saturation coil constitute a coupled inductor; and The magnetic excitation saturation control module is used to control the current in the magnetic excitation saturation coil, and the current is used to control the energy storage current limiting coil to be in a current limiting state or to control the energy storage current limiting coil to be in a saturation state.

8. The power-off holding circuit according to claim 7, characterized in that: When the second switch tube is in the on state and the third switch tube is in the off state, the energy storage current limiting coil is used to charge the energy storage capacitor in the current limiting state; as well as When the second switch tube is in the on state, the third switch tube is in the off state and the diode is in the unidirectional conduction state, the energy storage capacitor is used to reversely supply power to the server when the energy storage current limiting coil is in the saturation state.

9. A power supply protection method, characterized in that: The method applied to the power-off holding circuit according to any one of claims 1 to 8 comprises: Detecting the voltage on the server input bus; and When the voltage on the input bus is less than or equal to the first voltage threshold, the server is reversely powered based on the first voltage in the multiple capacitors in the first energy storage circuit, and / or the second voltage in the energy storage capacitor in the third energy storage circuit is reversely powered for the server.

10. The method according to claim 9, characterized in that The multiple capacitors include a first capacitor and a second capacitor connected in parallel with the first capacitor; the first energy storage circuit also includes: a third switch tube and a diode; the first capacitor and the third switch tube are sequentially connected in series between the positive electrode of the input bus and the negative electrode of the input bus; a diode, the positive electrode of the diode is connected to the negative electrode of the input bus; the second capacitor is connected in series between the positive electrode of the input bus and the negative electrode of the diode; When the voltage on the input bus is equal to the first voltage threshold, reverse powering the server based on the first voltage in the plurality of capacitors in the first energy storage circuit includes: When the voltage on the input bus is equal to the first voltage threshold and the second voltage in the energy storage capacitor is equal to the second voltage threshold, the third switch tube is controlled to be in an off state, so as to reversely power the server based on the first voltage in the first capacitor and the second capacitor when the diode is in a unidirectional conduction state.

11. The method according to claim 10, characterized in that When the voltage on the input bus is less than the first voltage threshold, reverse power is supplied to the server based on the first voltage in the plurality of capacitors in the first energy storage circuit and the second voltage in the energy storage capacitor in the third energy storage circuit, including: When the voltage on the input bus is less than the first voltage threshold, the voltage on the input bus is greater than the third voltage threshold, and the second voltage is equal to the second voltage threshold, the third switch tube is controlled to be in the disconnected state for a first period of time, and the second switch tube in the third energy storage circuit is controlled to be in the on state, and when the first switch tube in the second energy storage circuit is in the disconnected state and the diode is in the unidirectional conduction state, the multiple capacitors are controlled to be connected in parallel with the energy storage capacitor, and the first voltage and the second voltage are used to reverse power the server.

12. The method according to claim 11, characterized in that The power-off holding circuit further includes: a current limiting resistor and a fourth switch tube; one end of the current limiting resistor is arranged between the second switch tube and the energy storage capacitor; the fourth switch tube is connected in series between the other end of the current limiting resistor and the cathode of the diode; When the voltage on the input bus is less than the first voltage threshold, reverse power is supplied to the server based on the first voltage in the plurality of capacitors in the first energy storage circuit and the second voltage in the energy storage capacitor in the third energy storage circuit, including: When the voltage on the input bus is equal to the third voltage threshold, the second voltage is less than the second voltage threshold, and the second voltage is greater than a fourth voltage threshold, the plurality of capacitors are continuously controlled to be connected in parallel with the energy storage capacitor, and the first voltage and the second voltage are used to reversely power the server; and When the voltage on the input bus is equal to the third voltage threshold and the second voltage is equal to the fourth voltage threshold, the second switch tube is controlled to be in an off state, and after the second switch tube is in the off state for a second period of time, the fourth switch tube is controlled to be in an on state, and when the first switch tube and the third switch tube are both in the off state and the diode is in a unidirectional conduction state, the multiple capacitors and the energy storage capacitor are controlled to be connected in series, and the first voltage and the second voltage are used to reverse power the server.

13. The method according to claim 9, characterized in that The method further comprises: In response to the voltage on the input bus being greater than the first voltage threshold, controlling the third switch tube in the first energy storage unit to be in an on state, so as to control the multiple capacitors to store energy according to the voltage; and After the third switch tube is in the on state for a third period of time, the first switch tube in the second energy storage circuit is controlled to be in the on state to control the inductor in the second energy storage circuit to store energy for the energy storage capacitor, and the inductor is used to store energy to boost the voltage on the input bus to the target voltage.

14. The method according to claim 13, characterized in that The controlling the second energy storage circuit to store energy for the energy storage capacitor comprises: The first switch tube and the second switch tube in the third energy storage circuit are controlled to be turned on alternately according to a specified duty cycle, so that the inductor can charge the energy storage capacitor.

15. The method according to claim 14, characterized in that The method further comprises: Detecting whether the second voltage in the energy storage capacitor is equal to the second voltage threshold; In response to the second voltage being equal to the second voltage threshold, controlling the second switch tube to be continuously in the on state, and controlling the first switch tube to be continuously in the off state, so that when the diode of the first energy storage circuit is in the unidirectional conduction state, the energy storage capacitor is in the discharge state; and When the second voltage is equal to a fifth voltage threshold, the first switch tube is controlled to be in an on state, and the second switch tube is controlled to be continuously in an off state, so as to control the inductance in the second energy storage circuit to continue to supply power to the energy storage capacitor.

16. The method according to claim 15, characterized in that The inductor is an energy storage current limiting coil; the second energy storage circuit also includes: a magnetic excitation saturation control module, a magnetic excitation saturation coil and a magnetic core; the energy storage current limiting coil, the magnetic core and the magnetic excitation saturation coil constitute a coupled inductor; the magnetic excitation saturation control module is used to control the current in the magnetic excitation saturation coil, and the current is used to control the energy storage current limiting coil to be in a current limiting state or to control the energy storage current limiting coil to be in a saturation state.

17. The method according to claim 16, characterized in that When the second switch tube is in the on state and the third switch tube is in the off state, the energy storage current limiting coil is used to charge the energy storage capacitor in the current limiting state; as well as When the second switch tube is in the on state, the third switch tube is in the off state, and the diode is in the unidirectional conduction state, the energy storage capacitor reversely supplies power to the server when the energy storage current limiting coil is in the saturation state.

18. A power supply control circuit, characterized in that: The power supply control circuit is used to control the power-off holding circuit to reversely supply power to the server, and the power-off holding circuit is the power-off holding circuit described in any one of claims 2 to 8, and the power supply control circuit includes: A first driving circuit comprises a first power supply, a first switching switch, a second switching switch, a first control driving unit of a third switching tube, a first delay unit and a second control driving unit of the second switching tube, wherein the first power supply, the first switching switch, the second switching switch, the first delay unit and the second control driving unit are sequentially connected in series, the first control driving unit is connected between the second switching switch and the first delay unit, the first power supply is used to supply power to the first driving circuit, the first control driving unit is used to control the third switching tube to be in an on state or an off state, and the second control driving unit is used to control the second switching tube to be in an on state; An input voltage detection unit, connected to the input bus, and used to detect the voltage on the input bus; an input voltage judgment unit, wherein a first end of the input voltage judgment unit is connected to the input voltage detection unit, and a second end of the input voltage judgment unit is connected to the second switch, the input voltage judgment unit is used to compare the first voltages in the plurality of capacitors in the first energy storage circuit with a first voltage threshold, and to control the second switch to be in an on state or in an off state according to a first comparison result, wherein the first comparison result is a comparison result between the first voltage and the first voltage threshold; a capacitor voltage detection unit connected to the energy storage capacitor in the third energy storage circuit, the capacitor voltage detection unit being used to detect a second voltage in the energy storage capacitor; and A capacitor voltage judgment unit, wherein a first end of the capacitor voltage judgment unit is connected to the capacitor voltage detection unit, and a second end of the capacitor voltage judgment unit is connected to the second switching switch, and the capacitor voltage judgment unit is used to compare the second voltage with a second voltage threshold, and to control the first switching switch to be in an on state or to control the first switching switch to be in an off state according to a second comparison result; the second comparison result is a comparison result between the second voltage and the second voltage threshold.

19. The power supply control circuit according to claim 18, characterized in that: The power supply control circuit also includes: The second driving circuit includes a second power supply, a third switch, a fourth switch, the second control driving unit, a second delay The second power supply, the third switching switch, the fourth switching switch, the second delay unit and the third control driving unit are connected in series in sequence, the second control driving unit is connected between the third switching switch and the second delay unit, the second power supply is used to power the second drive circuit, the second control driving unit is also used to control the second switch tube to be in an off state, and the third control driving unit is used to control the fourth switch tube to be in an on state; The second end of the input voltage judgment unit is also connected to the fourth switch, and the input voltage judgment unit is further used to control the fourth switch to be in an on state or control the fourth switch to be in an off state according to the first comparison result; and The second end of the capacitor voltage judgment unit is also connected to the third switch, and the capacitor voltage judgment unit is further used to control the fourth switch to be in an on state or to control the fourth switch to be in an off state according to the second comparison result.

20. The power supply control circuit according to claim 19, characterized in that: When the first comparison result is that the first voltage is greater than the first voltage threshold, the input voltage judgment unit controls the second switch to be in an on state, so as to send a first control signal to the second control driving unit, and the second control driving unit controls the third switch tube to be in an on state according to the first control signal; When the first comparison result is that the first voltage is equal to the first voltage threshold, the input voltage judgment unit controls the second switch to be in an on state, so as to send a second control signal to the second control driving unit, and the second control driving unit controls the third switch tube to be in an off state according to the second control signal; When the first comparison result is that the first voltage is less than the first voltage threshold and the first voltage is greater than a third voltage threshold, the input voltage judgment unit controls the second switch to be in an off state, so as to keep the third switch tube in an off state; as well as When the first comparison result is that the first voltage is equal to the third voltage threshold, the input voltage judgment unit controls the fourth switching switch to be in the on state to send the third control signal to the second control driving unit, and the third control signal is used to control the second switch tube to be in the off state.

21. The power supply control circuit according to claim 20, characterized in that: When the second comparison result is that the second voltage is equal to the second voltage threshold, the capacitor voltage judgment unit controls the first switch to be in an on state, so as to send a fourth control signal to the second control driving unit through the first delay unit, and the second control driving unit controls the second switch tube to be in an on state according to the fourth control signal, and the first delay unit is used to delay the fourth control signal for a first time length before sending it to the second control driving unit; When the second comparison result is that the second voltage is less than the first voltage threshold and the second voltage is greater than a fourth voltage threshold, the capacitor voltage judgment unit controls the first switch to be in an on state, and the second control driving unit continuously controls the second switch tube to be in an on state according to the fourth control signal; as well as When the second comparison result is that the second voltage is less than or equal to the fourth voltage threshold, the capacitor voltage judgment unit controls the first switching switch to be in an off state to stop sending the fourth control signal to the first control driving unit, and controls the third switching switch to be in an on state to send the fifth control signal to the third control driving unit through the second delay unit. The fifth control signal is used to control the fourth switch tube to be in an on state, and the second delay unit is used to delay the fifth control signal for a second time length before sending it to the third control driving unit.

22. The power supply control circuit according to claim 21, characterized in that: When the first switching switch and the second switching switch are both in the on state, the first driving circuit is in the on state; When the third switch and the fourth switch are both in the on state, the second drive circuit is in the on state.

23. The power supply control circuit according to claim 21, characterized in that: When the third switch tube and the second switch tube are both in the on state, and the first switch tube and the fourth switch tube in the second energy storage circuit are both in the off state, the multiple capacitors are connected in parallel with the energy storage capacitor; When the second switch tube and the fourth switch tube are both in the on state, and the first switch tube and the third switch tube are both in the off state, the multiple capacitors are connected in series with the energy storage capacitor.

24. A power supply protection device, characterized in that: The power-off holding circuit according to any one of claims 1 to 8, the device comprising: The first detection module is used to detect the voltage signal on the server input bus; The first control module is used to reversely power the server based on the first voltage in the multiple capacitors in the first energy storage circuit and / or the second voltage in the energy storage capacitor in the third energy storage circuit when the voltage on the input bus is less than or equal to the first voltage threshold.

25. A server, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the power supply protection method according to any one of claims 9 to 17 by executing the computer instructions.

26. A non-volatile computer-readable storage medium, characterized in that: The non-volatile computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the power supply protection method according to any one of claims 9 to 17.

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