Power supply system, server node and computing device

Abstract

Embodiments of the present application relate to the technical field of power supply, and specifically relate to a power supply system, a server node and a computing device. The power supply system comprises a first power supply, a second power supply and an output bus. The first power supply comprises a voltage detection circuit and a first control circuit. The first control circuit is configured to: acquire an input voltage detection signal; determine an input state of the first power supply based on the input voltage detection signal; if it is determined that the first power supply is input power failure, control the first power supply to lower an output voltage to a first voltage within a first time. The second power supply comprises a second control circuit. The second control circuit is configured to: acquire the input voltage detection signal; determine the input state of the first power supply based on the input voltage detection signal; if it is determined that the first power supply is input power failure, control the second power supply to raise an output voltage to a second voltage within a second time. The embodiments of the present application simplify the architecture of the power supply system, and reduce the cost and occupied space of the power supply system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, in particular to a power supply system, a server node and a computing device. BACKGROUND

[0002] The computing device such as the whole cabinet server adopts a centralized power supply scheme to supply power to various loads such as processors, hard disks, network cards and fans in the computing device. Generally, the power supply scheme of the computing device is an alternating current to direct current power supply unit (AC / DC PSU) and battery combination scheme. Specifically, in the case that the AC / DC PSU is connected to the mains and can normally supply power, the AC / DC PSU supplies power to the loads. In the case that the AC / DC PSU is powered off, the battery takes over the AC / DC PSU to supply power to the loads.

[0003] Among them, when the AC / DC PSU is switched to the battery, the voltage supplied to the load will drop, affecting the normal work of the load with narrow working voltage range. SUMMARY

[0004] The embodiments of the present application provide a power supply system, a server node and a computing device, which can simplify the architecture of the power supply system, reduce the cost and space occupied by the power supply system.

[0005] In a first aspect, a power supply system is provided, which includes: a first power supply, a second power supply and an output bus; wherein the input end of the first power supply is electrically connected to the mains power, and the output end of the first power supply is electrically connected to the output bus; the output of the second power supply is electrically connected to the output bus; the first power supply is used to convert the mains power into a power supply voltage; the second power supply is used to provide a power supply voltage for the load after the first power supply input is powered off; the first power supply includes a voltage detection circuit and a first control circuit; the input end of the voltage detection circuit is electrically connected to the input end of the first power supply; the first output end of the voltage detection circuit is electrically connected to the detection input end of the first control circuit; the control signal output end of the first control circuit is electrically connected to the control end of the first power supply; the voltage detection circuit is used to detect the input voltage of the first power supply and output an input voltage detection signal; the first control circuit is used to: obtain the input voltage detection signal; determining the input state of the first power supply based on the input voltage detection signal; if it is determined that the input of the first power supply is powered off, controlling the first power supply to lower the output voltage to a first voltage within a first time; wherein, the first time is less than the power-off retention time of the first power supply; the second power supply includes a second control circuit; the second output end of the voltage detection circuit is electrically connected to the detection input end of the second control circuit; the control signal output end of the second control circuit is electrically connected to the control end of the second power supply; the second control circuit is used to: obtain the input voltage detection signal; determine the input state of the first power supply based on the input voltage detection signal; if it is determined that the input of the first power supply is powered off, controlling the output voltage of the second power supply to increase to a second voltage within a second time; wherein, the second time is less than the power-off retention time of the first power supply; wherein, the first voltage is less than the second voltage.

[0006] In this power supply system, when the input voltage of the first power supply drops, the output voltage of the first power supply is actively reduced, and the output voltage of the second power supply is increased, thereby triggering the second power supply to start supplying power to the load before the stored energy of the first power supply is exhausted. After the second power supply begins supplying power to the load, the first power supply has not yet exhausted its energy and can continue to supply power to the load, thus avoiding the voltage drop caused by the sudden change of the second power supply from an unloaded state to a heavily loaded state.

[0007] In one possible implementation, the second power supply further includes a battery and a switching circuit; the switching circuit is connected in series between the output end of the battery and the output bus; the output end of the second control circuit is electrically connected to the control input end of the battery; the second control circuit is used to control the output of the battery to output the second voltage; wherein the difference between the second voltage and the first voltage is greater than a first threshold voltage; and the switching circuit is in an on state.

[0008] In a possible implementation, the first control circuit or the second control circuit is configured to determine the input state of the first power supply based on the input voltage detection signal, including: the first control circuit or the second control circuit is configured to determine that the input of the first power supply is powered off if the input voltage detection signal is less than a second threshold voltage.

[0009] In a possible implementation, the first control circuit is configured to control the first power supply to lower the output voltage to a first voltage, including: the first control circuit is configured to lower the output voltage of the first power supply to the first voltage at a first speed; and the second control circuit is configured to control the second power supply to raise the output voltage to a second voltage, including: the second control circuit is configured to raise the output voltage of the second power supply to the second voltage at a second speed.

[0010] In a possible implementation, the first control circuit is configured to, after the output voltage of the first power supply is lowered to the first voltage, maintain the output of the first voltage for a third time; and the sum of the first time and the third time is less than the power-off holding time.

[0011] In this implementation, the first power supply maintains the first voltage for the third time, and the sum of the first time and the third time is less than the power-off holding time, so that the first power supply can supply power to the load for the third time, avoiding voltage drop of the second power supply.

[0012] In a possible implementation, the second control circuit is further configured to, after the output voltage of the second power supply is raised to the second voltage, maintain the output of the second voltage for a fourth time; and the sum of the second time and the fourth time is less than the power-off holding time.

[0013] In this implementation, the second power supply maintains the first voltage for the third time, and the sum of the second time and the fourth time is less than the power-off holding time, so that the second power supply can supply a relatively high voltage to the load for the fourth time, and the first power supply can supply power to the load, avoiding voltage drop of the second power supply.

[0014] In a possible implementation, the second control circuit is further configured to, after determining that the second power supply enters the heavy load state, lower the second voltage to the output voltage before the second power supply is raised.

[0015] In this implementation, after the second power supply enters the heavy load state, the second voltage can be lowered to the original voltage, without the need to continuously maintain a high output voltage, thereby prolonging the use time of the second power supply.

[0016] In a possible implementation, the first control circuit is configured to control the first power supply to output a third voltage if it is determined that the input of the first power supply is not powered off, and the second control circuit is configured to control the second power supply to output a fourth voltage if it is determined that the input of the first power supply is not powered off, where the third voltage is greater than the fourth voltage.

[0017] In a second aspect, a server node is provided, which includes an open-loop power supply and a load. An input terminal of the open-loop power supply is electrically connected to an output bus of the power supply system according to the first aspect, and an output terminal of the open-loop power supply is electrically connected to the load. The open-loop power supply is configured to provide a working voltage for the load. The open-loop power supply is a power supply whose output voltage changes with an input voltage.

[0018] In a third aspect, a computing device is provided, which includes the power supply system according to the first aspect and the server node according to the second aspect. The power supply system is configured to supply power for the server node.

[0019] The power supply system, the server node, and the computing device provided by the embodiments of the present application do not need a closed-loop power supply, but an open-loop power supply can meet the voltage requirements of all loads, thereby improving the power supply efficiency, simplifying the architecture of the power supply system, and reducing the cost and space occupied by the power supply system. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1A A schematic diagram of voltage drop of a battery;

[0021] Figure 1B A schematic structural diagram of a computing device;

[0022] Figure 2 A schematic structural diagram of a computing device provided by the embodiments of the present application;

[0023] Figure 3 A schematic diagram of voltage change during power supply switching provided by the embodiments of the present application. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments.

[0025] In the description of the present embodiments, "one embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrases "in one embodiment" or "in some embodiments" in various places in the specification are not necessarily all referring to the same embodiment, although it can be. Furthermore, the terms "a" or "an", as used herein, are defined as one or more than one.

[0026] In the description of the present embodiments, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" herein is only a description of the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, in the description of the present embodiments, "multiple" means two or more than two.

[0027] In the description of the present embodiments, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. The terms "include", "contain", "have" and their variants mean "include but are not limited to", unless otherwise specifically emphasized.

[0028] Computing devices such as servers (e.g., whole-cabinet servers), switches, computers, etc. adopt a same set of power supply systems to supply power to various loads in the computing devices. A load refers to a device, component, module, or assembly, etc. that works under the drive of electric energy to realize a related function. For a computing device, the loads usually include a voltage regulator module (VRM) coupled to a central processing unit (CPU), a VRM coupled to a memory, a hard disk, a network card (peripheral component interconnect express (PCIe) network card), a fan, etc. Different loads have different working voltage ranges. For example, the working voltage range of the VRM is 10.2V-13.8V, and the working voltage range of the fan is 10.8V-13.2V, which are loads with wide working voltage ranges. For another example, the working voltage range of the network card is 11.04-12.96V, and the working voltage range of the hard disk is 11.4-12.6V, which are loads with narrow working voltage ranges.

[0029] The working voltage of a load refers to a voltage capable of driving the load to operate normally. The working voltage of a load is within the working voltage range of the load, i.e., a voltage within the working voltage range of the load is capable of driving the load to operate normally, and a voltage outside the working voltage range is difficult to drive the load to operate normally.

[0030] In addition, for the VRM load, the working voltage refers to a voltage capable of being regulated by the VRM to drive the downstream load to operate normally. The downstream load of the VRM refers to a load taking the output of the VRM as input, for example, the downstream load of the VRM coupled to the CPU is the CPU, and the downstream load of the VRM coupled to the memory is the memory.

[0031] The power supply system includes an AC-DC power supply and a battery. The AC-DC power supply, which can be referred to as PSU for short, is used as a main power supply to connect to the mains to convert AC power from the mains into DC power with a suitable voltage to power various loads in the computing device. The battery, as an auxiliary power supply or backup power supply, has a voltage lower than the voltage output by the AC-DC power supply, and the difference between the voltage of the battery and the voltage output by the AC-DC power supply is large enough (generally not less than 2V) to keep the battery in an idle state when the AC-DC power supply can power the load, avoiding the battery outputting power to the outside to maintain the stored power of the battery.

[0032] The AC-DC power supply has a power-down holding function. Specifically, the AC-DC power supply has a storage module (e.g., a capacitor) so that the AC-DC power supply can continue to power the load without interruption in the case of a short-term interruption of the mains (e.g., a voltage dip within 20ms). The AC-DC power supply has a power-down holding duration. The power-down holding duration refers to the longest duration for which the AC-DC power supply continues to power the load after the connection between the AC-DC power supply and the mains is interrupted. As shown in FIG. 1, within the power-down holding duration after the input of the AC-DC power supply is powered down, the AC-DC power supply can power the load, and when the power-down holding duration has elapsed, the power in the storage module of the AC-DC power supply is exhausted, and the voltage output by the AC-DC power supply drops rapidly. When the voltage output by the AC-DC power supply is lower than the voltage of the battery, the battery starts to power the load, at which time the battery suddenly enters a heavy load state from an idle state, causing the battery to be unable to react or adapt to the heavy load state, resulting in a sudden drop in the voltage of the battery. The drop can form a dip as shown in FIG. 2. Figure 1A Figure 1A

[0033] The voltage of the dip is low, which is outside the working voltage range of the load with a narrow working voltage range, thereby causing the load to fail to operate normally and affecting the business of the computing device.

[0034] ​​In one solution, a closed-loop power supply is arranged between the power supply system and the load to cope with voltage drop of the battery. The output voltage of the closed-loop power supply is a constant value and has no relationship with the input voltage and the load. However, the power supply efficiency of the closed-loop power supply is low and the power is wasted seriously.

[0035] In another solution, referring to Figure 1B , a closed-loop power supply is arranged in the server node to cope with voltage drop, and an open-loop power supply is arranged between the power supply system and the load with a wide working voltage range. The output voltage of the closed-loop power supply is a constant value and has no relationship with the input voltage and the load. However, the power supply efficiency of the closed-loop power supply is low and the power is wasted seriously. The output voltage of the open-loop power supply is not a constant value and changes with the input voltage. The output voltage has a linear relationship with the input voltage. Compared with the closed-loop power supply, the open-loop power supply has higher efficiency. However, the open-loop power supply is not suitable for the load with a narrow working voltage range. In order to balance the power supply efficiency and the stability of the load working, the closed-loop power supply and the open-loop power supply are used simultaneously in the current system, which leads to complex power supply system architecture, large occupied area and high cost.

[0036] Referring to Figure 2 , the embodiment of the present application provides a power supply system 300, which comprises a first power supply 310 and a second power supply 320 and an output bus. The output bus can also be referred to as a bus.

[0037] The input end of the first power supply 310 is electrically connected to the commercial power supply, and the output end of the first power supply 310 is electrically connected to the output bus. The first power supply is used to convert the commercial power supply into a power supply voltage to supply power to the load. The output of the second power supply is electrically connected to the output bus. The second power supply is used to provide a power supply voltage for the load after the input of the first power supply is powered off.

[0038] Continuing to refer to Figure 2 , the first power supply 310 comprises a voltage detection circuit 312 and a control circuit 313. The control circuit 313 can also be referred to as a first control circuit. The input end of the voltage detection circuit 312 is electrically connected to the input end of the first power supply 310, and the first output end of the voltage detection circuit 312 is electrically connected to the detection input end of the control circuit 313. The control signal output end of the control circuit 313 is electrically connected to the control end of the first power supply 310.

[0039] Next, the power supply system provided by the embodiment of the present application is specifically described.

[0040] Continuing to refer to Figure 2The first power supply 310 includes a conversion module 311. The conversion module 311 includes at least one conversion module, such as conversion module A1 and / or conversion module A2. When the at least one conversion module includes a plurality of conversion modules, the plurality of conversion modules are connected in parallel. An input end of the conversion module is configured to be connected to a power grid to receive a voltage output by the power grid. The conversion module, which can also be referred to as a power conversion circuit, can convert the received voltage into a direct current voltage with a size of voltage V1 (e.g., 54 V) and output the direct current voltage to the open-loop power supply 400. The open-loop power supply 400 converts (e.g., steps down) the direct current voltage into an operating voltage of a load to drive the load to operate. For example, an output end of the conversion module can be connected to a busbar, and the voltage is transmitted to the open-loop power supply 400 through the busbar, and then the load 510, the load 520, and the like are driven to operate. The load 510 and / or the load 520 can be a hard disk, a network card, or the like, which has a narrow operating voltage range.

[0041] The voltage V1 refers to a voltage that can enable the open-loop power supply 400 to generate an operating voltage of a load.

[0042] The conversion module 311 further includes at least one energy storage module, such as energy storage module B1. In an example, the energy storage module can be a capacitor. The energy storage module can store electrical energy, and when the input end of the first power supply 310 is powered off (e.g., the connection between the conversion module and the power grid is disconnected), the energy storage module can output a voltage to a power conversion circuit (e.g., a conversion module in the conversion module 311), so that the power conversion circuit inputs a voltage to a load to implement a power-off hold function of the conversion module 311.

[0043] In some embodiments, the conversion module 311 is specifically a PSU power supply.

[0044] The voltage detection circuit 312 is configured to detect an input voltage of the first power supply 310 and output a voltage detection signal. The input voltage can also be referred to as an input end voltage. For example, the input end of the first power supply 310 is specifically an input end of the conversion module 311 or an input end of a conversion module in the conversion module 311. The input end refers to an end connected to a power grid and receiving a voltage from the power grid. That is, the voltage detection circuit 312 is configured to detect a voltage received by the first power supply 310 from the power grid. The voltage detection circuit 312 can generate and output a voltage detection signal through an output end thereof, and the voltage detection signal is used to represent the size of the voltage detected by the voltage detection circuit 312. In some embodiments, the voltage detection circuit 312 can be specifically a resistance voltage division detection circuit, a voltage sensor, or the like.

[0045] The control circuit of the first power supply 310, i.e., the control circuit 313, can obtain the voltage detection signal from the power supply detection circuit 312 and determine the input state of the first power supply 310 based on the voltage detection signal. The input state of the first power supply 310 is divided into a power-off state and a non-power-off state. The specific manner of determining the input state of the first power supply 310 will be described below and will not be repeated here.

[0046] If it is determined that the input of the first power supply 310 is powered off, i.e., the input state of the first power supply 310 is the non-power-off state, the output voltage of the first power supply is lowered to the first voltage within a first time. The first time is a time period, and the length of the time period is less than the length of the power-off holding time of the first power supply 310.

[0047] Continuing to refer to Figure 2 The second power supply 320 includes a battery 321 and a control circuit 322. The control circuit 322 can also be referred to as a second control circuit. The battery 321 stores electrical energy. The second power supply 320 is used to supply power to the load when the first power supply 310 cannot normally supply power to the load. During normal operation of the first power supply 310, the output end of the second power supply 320 can output a voltage. The output end of the second power supply 320 refers to an end that outputs a voltage to the load. For example, the battery 321 can be a lithium battery, a sodium battery, or other forms of batteries.

[0048] The detection input end of the control circuit 322 is electrically connected to the second output end of the voltage detection circuit 312, so as to obtain the voltage detection signal from the voltage detection circuit 312. The control signal output end of the control circuit 322 is electrically connected to the control end of the second power supply 320. The control end of the second power supply 320 can control the output voltage of the second power supply 320.

[0049] The control circuit 322 can determine the input state of the first power supply 310 based on the voltage detection signal obtained from the voltage detection circuit 312. The specific manner of determining the input state of the first power supply 310 will be described below and will not be repeated here.

[0050] If the determined input state of the first power supply 310 indicates that the input of the first power supply 310 is powered off, the control circuit 322 controls the output voltage of the second power supply 320 to be raised to a second voltage greater than the first voltage within a second time. The second time is a time period, and the length of the time period is less than the length of the power-off holding time of the first power supply 310.

[0051] In the power supply system 300, when the power failure occurs at the input end of the first power supply 310, the first power supply 310 actively reduces the output voltage of the first power supply 310, and the second power supply 320 actively increases the output voltage of the second power supply, so that the output end voltage of the first power supply 310 is lower than the output voltage of the second power supply 320, to trigger the second power supply 320 to start supplying power to the load before the stored power of the first power supply 310 is exhausted. Thus, when the second power supply 320 starts to supply power to the load, the stored power of the first power supply 310 has not been exhausted, so that the first power supply 310 can still continue to supply power to the load, and the sudden change from no load to heavy load of the second power supply 320 can be avoided, so as to avoid voltage drop. Further, it is not necessary to set a closed-loop power supply for a load with a narrow working power range, so as to guarantee the normal work of the load. That is, through the scheme, it is not necessary to set a closed-loop power supply between each load and the power supply system, but only to set an open-loop power supply, so as to simplify the power supply structure and effectively improve the power supply efficiency of the power supply system.

[0052] Next, a detailed description is made.

[0053] In some embodiments, the control circuit 313 (first control circuit) or the control circuit 322 (second control circuit) is a circuit with data processing capability, such as a microcontroller unit (MCU), a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), etc.

[0054] In some embodiments, the control circuit 313 and the control circuit 322 can be two independent circuits, that is, the output voltage of the first power supply 310 and the output voltage of the second power supply 320 are controlled by different control circuits respectively.

[0055] In some embodiments, the control circuit 313 and the control circuit 322 can be the same circuit, that is, the output voltage of the first power supply 310 and the output voltage of the second power supply 320 are controlled by the same control circuit.

[0056] In some embodiments, as Figure 2As shown, the output of the first power supply 310 and the output of the second power supply 320 are both connected to the bus, and a switching circuit 323 is provided between the output of the second power supply 320 and the bus. The switching circuit 323 can detect the output voltage of the second power supply 320 and the voltage on the bus. When the first power supply 310 is normally powered, the voltage at the output of the second power supply 320 is less than the voltage on the bus, and the switching circuit 323 is in an off state. When the first power supply 310 is powered off and the voltage at the output of the second power supply 320 is greater than the voltage on the bus, and the difference between the voltage at the output of the second power supply 320 and the voltage on the bus is greater than a threshold Y1, the switching circuit 323 is turned on under the action of the voltage difference between the bus and the output of the second power supply 320, so that the second power supply 320 is connected to the bus, thereby causing the second power supply 320 to output voltage to the bus, and further output voltage to the load. The threshold Y1 can also be referred to as a first threshold voltage. The threshold Y1 is determined by the turn-on characteristics of the switching circuit 323. The switching circuit 323 can be an oring. The switching circuit 323 can include a semiconductor device, such as a metal-oxide-semiconductor field-effect transistor (MOSFET) or an electrical switch such as a relay, without limitation.

[0057] In order to avoid unnecessary power consumption, when the input voltage of the first power supply 310 is normal, the output voltage of the second power supply 320 is a fourth voltage. The fourth voltage is less than the output voltage of the first power supply 310 when it is normally working (i.e., voltage V1). The voltage V1 can also be referred to as a third voltage. In this way, during the normal working period of the first power supply 310, the voltage on the bus is greater than the output voltage of the second power supply 320, so that the switching circuit 323 is in an off state, avoiding the bus from delivering power to the second power supply 32. In one example, the voltage V1 can be 54V, and the output voltage of the second power supply 320 can be 52V. In one example, the voltage V1 can be 56V, and the output voltage of the second power supply 320 can be 54V.

[0058] When the second power supply 320 needs to take over the first power supply 310 to supply power to the load, the output voltage of the second power supply 320 is greater than the voltage on the bus, and the difference between the voltage at the output of the second power supply 320 and the voltage on the bus is greater than the threshold Y1, so that the switching circuit 323 is turned on under the action of the voltage difference between the bus and the output of the second power supply 320, so that the second power supply 320 is connected to the bus, thereby causing the second power supply 320 to output voltage to the bus, and further output voltage to the load.

[0059] In the power supply system provided in the embodiments of the present application, when the second power supply 320 takes over the power supply for the load from the first power supply 310, voltage drop can be avoided. Details are as follows.

[0060] The control circuit 313 is connected with the voltage detection circuit 312. The control circuit 313 can obtain the input voltage detection signal from the voltage detection circuit 312. The control circuit 313 can determine whether the voltage value of the input voltage detection signal is greater than a threshold value Y2. The threshold value Y2 can also be referred to as a second threshold voltage, which is a preset value. In an example, the second threshold voltage can be 50V. In an example, the second threshold voltage can be 10V. And so on, which will not be listed one by one here. When the input voltage of the first power supply 310 (i.e., the conversion module 311) is greater than the threshold value Y2, the conversion module in the conversion module 311 can obtain the voltage V1 under the driving of the input voltage.

[0061] When the voltage indicated by the input voltage detection signal is less than the threshold value Y2, the control circuit 313 can confirm that the input end of the power supply 310 is powered off. In the embodiments of the present application, the power supply input end powered off means that the voltage received by the power supply from the power grid is less than the preset threshold voltage, for example, the threshold value Y2.

[0062] Referring to Figure 3 When the control circuit 313 determines that the input end of the first power supply 310 is powered off, the control circuit 313 can actively reduce the output voltage of the first power supply 310. As described above, when the input end of the first power supply 310 is powered off, the energy storage module inputs voltage to the load through the power conversion circuit. The control circuit 313 can control the output voltage of the power conversion circuit by controlling the opening or closing of the related switching elements in the power conversion circuit, thereby reducing the output voltage of the first power supply 310, so as to achieve the active reduction of the output voltage of the first power supply 310.

[0063] The active reduction of the output voltage of the first power supply 310 can trigger the second power supply 320 to output voltage to the load before the energy in the energy storage module of the first power supply 310 is exhausted. Details are as follows.

[0064] In the power supply system provided in the embodiments of the present application, the control circuit 313 actively reduces the output voltage of the first power supply 310, and the voltage on the bus also decreases. When the voltage on the bus is less than the output voltage of the second power supply 320, and the difference between the voltage on the bus and the output voltage of the second power supply 320 is greater than the threshold value Y1, the switching circuit 323 between the bus and the output end of the second power supply 320 is turned on under the action of the voltage difference between the bus and the output end of the second power supply 320, and the second power supply 320 outputs voltage to the bus or the load.

[0065] The control circuit 313 needs to trigger the second power supply 320 to output voltage to the load before the energy stored in the first power supply 310 is exhausted, so that when the second power supply 320 is converted from the no-load state to the heavy load state, the first power supply 310 which has not exhausted the energy can also output voltage to the load, and the voltage drop of the second power supply 320 can be avoided. Specifically, whenever the load of the second power supply 320 increases and causes the voltage to drop, in the case that the voltage of the second power supply 320 drops to the output voltage of the first power supply 310, the first power supply 310 can output voltage to the load, and the voltage of the second power supply can be prevented from continuing to drop, thereby avoiding the instantaneous drop of the voltage.

[0066] In one example of these embodiments, in order to ensure that the output voltage of the first power supply 310 after the output voltage is lowered can trigger the second power supply 320 to start supplying power to the load, and the first power supply 310 can continue to supply power to the load, the output voltage of the first power supply 310 can be actively lowered to voltage V2, and the output voltage of the first power supply 310 can be kept at voltage V2 for a preset time T1. Voltage V2 can also be referred to as the first voltage, and the preset time T1 can also be referred to as the third time. The difference between voltage V2 and the output voltage V3 (second voltage) of the second power supply 320 is within a preset range. The voltage difference in the preset range can trigger the second power supply 320 to start supplying power to the load (the voltage difference in the preset range is greater than threshold Y1), and is also less than the voltage dropped when the voltage drop of the second power supply 320 occurs. The preset time T1 is not less than the time length of the reaction period of the second power supply 320 from no load to heavy load, so as to avoid the voltage drop caused by the sudden conversion from no load to heavy load. Specifically, whenever the load of the second power supply 320 increases, since the output voltage of the first power supply 310 is voltage V2, when the voltage output by the second power supply 320 drops to voltage V2, the first power supply 310 is also supplying power to the load, thereby preventing the voltage of the second power supply 320 from continuing to drop and avoiding the voltage drop. The reaction period of the second power supply 320 from no load to heavy load refers to the period during which the second power supply 320 in the no load state adapts to the heavy load state, i.e. the period during which the output is transitioned from zero current or small current to large current. The time length of the reaction period of the second power supply 320 from no load to heavy load is usually a fixed value, and is much smaller than the power-down holding time of the first power supply 310. For example, the time length of the reaction period of the second power supply 320 from no load to heavy load is 10ms, and the power-down holding time of the first power supply 310 is 20ms.

[0067] In one example of the example, the first power supply 310 can determine the speed of the output voltage of the first power supply 310 according to the power-off holding time of the first power supply 310. Specifically, the power-off holding time of the first power supply 310 can be set as time T2. The control circuit 313 can lower the output voltage of the first power supply 310 to voltage V2 within time T3. The time T3 can also be referred to as the first time. The time T3 is less than the time T2. The starting time of the time T3 is the time when the control circuit 313 confirms that the input of the first power supply 310 is powered off.

[0068] In a more specific example of the example, the difference between the time T2 and the time T3 is not less than the time T1. That is, the sum of the first time (time T3) and the third time (time T1) is not less than the power-off holding time (time T1) of the first power supply 310.

[0069] In a more specific example of the example, the control circuit 313 can uniformly lower the output voltage of the first power supply 310, that is, the speed of the output voltage of the first power supply 310 is (voltage V1-voltage V2) / time T3. In another more specific example, the control circuit 313 can non-uniformly lower the output voltage of the first power supply 310. In which, the output voltage of the second power supply 320 can be set as voltage V3, the speed of the output voltage of the first power supply 310 from voltage V1 to voltage V3 is greater than the speed of the output voltage of the first power supply 310 from voltage V3 to voltage V2. In this way, the second power supply 320 can be triggered to output voltage to the load as soon as possible, while making the change of the voltage output to the load more smooth.

[0070] In another example of the embodiments, to ensure that the output voltage of the first power supply 310 after the voltage is lowered can trigger the second power supply 320 to start supplying power to the load, and the first power supply 310 can continue to supply power to the load after the second power supply 320 starts to supply power to the load, during the period of lowering the output voltage of the first power supply 310, when the output voltage of the first power supply 310 drops to a voltage V4, the lowering speed of the output voltage of the first power supply 310 is slowed down. In other words, the speed of the output voltage of the first power supply 310 dropping from the voltage VI to the voltage V4 is greater than the speed of the output voltage of the first power supply 310 dropping from the voltage V4. The voltage V4 is less than the output voltage V3 of the second power supply 320, and the difference between the voltage V3 and the voltage V4 is the threshold Yl. In this way, the second power supply 320 changes from the no-load state to the heavy load state before the energy stored in the energy storage module of the first power supply 310 is exhausted, and after the second power supply 320 starts to supply power to the load, the output voltage of the first power supply 310 drops slowly, so that the output voltage of the first power supply 310 does not suddenly drop sharply, so that the first power supply 310 can continue to output power to the load, avoiding voltage drop caused by sudden conversion from no load to heavy load. Specifically, when the load of the second power supply 320 increases, the voltage of the second power supply 320 drops, and since the first power supply 310 still has energy, when the voltage of the second power supply 320 is equal to the first power supply, the first power supply 310 outputs power, avoiding the voltage of the second power supply from further dropping, and the output power of the first power supply is slowly dropping, avoiding voltage drop of the second power supply.

[0071] Referring to Figure 3 , while the control circuit 313 lowers the output voltage of the first power supply 310, the control circuit 322 can raise the output voltage of the second power supply 320. So that the second power supply 320 starts to supply power to the load before the energy stored in the energy storage module of the first power supply 310 is exhausted, and during the period of the second power supply 320 changing from the no-load state to the heavy load state, the output voltage of the first power supply 310 can output power to the load, avoiding voltage drop caused by sudden conversion from no load to heavy load.

[0072] Specifically, the control circuit 313 controls the speed of the step-down of the output voltage of the first power supply 310, and the control circuit 322 controls the speed of the step-up of the output voltage of the second power supply 320, so that the output voltage of the second power supply 320 is greater than the output voltage of the first power supply 310, and the voltage difference between the output voltage of the second power supply 320 and the output voltage of the first power supply 310 is greater than the threshold Y1, before the energy stored in the energy storage module of the first power supply 310 is exhausted, so that the second power supply 320 can be triggered to start supplying power to the load. When the second power supply 320 starts supplying power to the load, the energy stored in the energy storage module of the first power supply 310 has not been exhausted, so that when the voltage of the second power supply 320 drops due to the increase of the load to the output voltage of the first power supply 310, the first power supply 310 can continue to output energy, so that the first power supply 310 can continue to supply power to the load during the reaction of the second power supply 320 from no load to heavy load, avoiding voltage drop.

[0073] In Figure 3 In one example of the embodiment shown, the control circuit 313 can determine the speed of the step-down of the output voltage of the first power supply 310 according to the power-off holding time of the first power supply 310. The control circuit 322 can determine the speed of the step-up of the output voltage of the second power supply 320 according to the power-off holding time of the first power supply 310. The power-off holding time of the first power supply 310 can be set as time T2. Within the time T6, the output voltage of the second power supply 320 is stepped up to the second voltage, so that the output voltage of the second power supply 320 is greater than the output voltage of the first power supply 310 (i.e. the first voltage) after the step-down, and the voltage difference between the output voltage of the second power supply 320 and the output voltage of the first power supply 310 after the step-down is greater than the threshold Y1. The starting time of the time T6 is the time when the control circuit confirms that the input of the first power supply 310 has power-off. The time T6 can also be referred to as the second time.

[0074] In one example, after the control circuit 322 steps up the output voltage of the second power supply 320 to the second voltage, the control circuit 322 maintains the output voltage of the second power supply 320 at the second voltage for a time not less than the fourth time. The time length of the second time and the time length of the fourth time are not less than the power-off holding time of the first power supply 310.

[0075] In one specific example, the difference between the time T2 (i.e. the power-off holding time of the first power supply 310) and the time T6 is not less than the time T1. As described above, the time T1 is not less than the time during which the second power supply 320 reacts from no load to heavy load.

[0076] The above describes the operation of the power supply system 300 when the input of the first power supply 310 has power-off.

[0077] When the input of the first power supply 310 is not powered off, the output voltage of the first power supply 310 continues to be the third voltage (i.e., the voltage V1), and the output voltage of the second power supply 320 continues to be the fourth voltage less than the third voltage. Specifically, the control circuit 313 controls the output voltage of the first power supply 310 to be the third voltage when it is determined, based on the voltage detection signal, that the input of the first power supply 310 is not powered off. The control circuit 322 controls the output voltage of the second power supply 320 to be the fourth voltage when it is determined, based on the voltage detection signal, that the input of the first power supply 310 is not powered off.

[0078] The power supply system provided by the embodiments of the present application can obtain the input voltage of the first power supply 310, and actively lower the output voltage of the first power supply 310 and raise the output voltage of the second power supply 320 when it is determined that the input voltage of the first power supply 310 is powered off, so as to trigger the second power supply 320 to start supplying power to the load before the power stored in the first power supply 310 is exhausted. After the second power supply 320 starts supplying power to the load, the first power supply 310 can continue to supply power to the load, avoiding voltage drop caused by sudden change from an empty load state to a heavy load state.

[0079] The power supply system provided by the embodiments of the present application does not need a closed-loop power supply, but can meet the voltage demand of all loads by using an open-loop power supply, thereby improving power supply efficiency, simplifying the architecture of the power supply system, and reducing the cost and space occupied by the power supply system.

[0080] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A power supply system characterized by comprising: The power supply system comprises a first power supply, a second power supply and an output bus; wherein the input end of the first power supply is electrically connected to commercial power, and the output end of the first power supply is electrically connected to the output bus; the output of the second power supply is electrically connected to the output bus; the first power supply is used to convert the commercial power into a power supply voltage; and the second power supply is used to provide the power supply voltage for a load after the input of the first power supply is powered off; the first power supply comprises a voltage detection circuit and a first control circuit; the input end of the voltage detection circuit is electrically connected to the input end of the first power supply; the first output end of the voltage detection circuit is electrically connected to the detection input end of the first control circuit; and the control signal output end of the first control circuit is electrically connected to the control end of the first power supply; the voltage detection circuit is used to detect the input voltage of the first power supply and output an input voltage detection signal; the first control circuit is used to: acquire the input voltage detection signal; determine the input state of the first power supply based on the input voltage detection signal; and if it is determined that the input of the first power supply is powered off, control the first power supply to lower the output voltage to a first voltage within a first time; wherein the first time is less than the power-off holding time of the first power supply; the second power supply comprises a battery and a second control circuit; the second output end of the voltage detection circuit is electrically connected to the detection input end of the second control circuit; and the control signal output end of the second control circuit is electrically connected to the control end of the battery; the second control circuit is used to: acquire the input voltage detection signal; determine the input state of the first power supply based on the input voltage detection signal; and if it is determined that the input of the first power supply is powered off, control the output voltage of the battery to be raised to a second voltage within a second time; wherein the second time is less than the power-off holding time of the first power supply; wherein the first voltage is less than the second voltage.

2. The power supply system of claim 1, wherein The second power supply further comprises a switching circuit; the switching circuit is connected in series between the output end of the battery and the output bus; the output end of the second control circuit is electrically connected to the control input end of the battery; and the second control circuit is used to control the battery to output the second voltage; wherein the difference between the second voltage and the first voltage is greater than a first threshold voltage; and the switching circuit is in a conducting state.

3. The power supply system according to claim 1 or 2, characterized by, The first control circuit or the second control circuit is used to: determine the input state of the first power supply based on the input voltage detection signal, comprising: The first control circuit or the second control circuit is used to: if the input voltage detection signal is less than a second threshold voltage, determine that the input of the first power supply is powered off.

4. The power supply system of claim 1, wherein The first control circuit is used to control the first power supply to lower the output voltage to the first voltage, comprising: The first control circuit is used to: lower the output voltage of the first power supply to the first voltage at a first speed; The second control circuit is used to: control the second power supply to raise the output voltage to the second voltage, comprising: The second control circuit is used to: raise the output voltage of the second power supply to the second voltage at a second speed.

5. The power supply system of claim 4, wherein, The first control circuit is configured to control the first power supply to output the first voltage after the output voltage of the first power supply is decreased to the first voltage, and maintain the first voltage for a third time; a sum of the first time and the third time is less than the power-off holding time.

6. The power supply system of claim 4, wherein, The second control circuit is further configured to control the second power supply to output the second voltage after the output voltage of the second power supply is increased to the second voltage, and maintain the second voltage for a fourth time; a sum of the second time and the fourth time is less than the power-off holding time.

7. The power supply system of claim 6, wherein, The second control circuit is further configured to decrease the second voltage to the output voltage of the second power supply before the second power supply is increased after determining that the second power supply enters a heavy load state.

8. The power supply system of claim 1, wherein, The first control circuit is configured to control the first power supply to output a third voltage if it is determined that the input of the first power supply is not powered off. The second control circuit is configured to control the second power supply to output a fourth voltage if it is determined that the input of the first power supply is not powered off; the third voltage is greater than the fourth voltage.

9. A server node, characterized by The server node comprises an open-loop power supply and a load, an input end of the open-loop power supply is electrically connected to an output bus of the power supply system according to any one of claims 1-8; an output end of the open-loop power supply is electrically connected to the load, and the open-loop power supply is configured to provide a working voltage for the load; wherein the open-loop power supply is a power supply with an output voltage changing with an input voltage.

10. A computing device, comprising: The power supply system according to any one of claims 1-8 and the server node according to claim 9; wherein the power supply system is configured to supply power for the server node.

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