Power supply unit and server power supply system

Abstract

The invention discloses a power supply unit and a server power supply system, and relates to the technical field of power supplies, and an over-current protection unit of the power supply unit is set to be an adjustable over-current protection unit comprising a first sampling circuit, a first voltage configuration circuit, a first voltage comparator and an over-current protection control circuit. Different reference voltages are configured based on the variable voltage output end of the first voltage configuration circuit, and the adjustment of an overcurrent point of the overcurrent protection unit is realized, so that the overcurrent protection control parameter of the voltage supply unit can be adjusted according to the surge current when the server is started. The problem of over-current self-locking caused by surge current when part of the voltage supply units are powered on firstly is avoided, so that the power supply stability of the parallel architecture of the power supply units is improved, and the system operation stability of the server is further improved.

Description

Technical Field

[0001] This invention relates to the field of power supply technology, and in particular to a power supply unit and a server power supply system. Background Technology

[0002] As server computing power increases, server power supply units need to support components with higher power consumption. Therefore, two or more power supply units are connected in parallel to meet power demands. However, when multiple power supply units are connected in parallel, due to individual differences, some power supply units may start up first, while others start up later. If the equivalent capacitance at the output terminal is large, a large inrush current will be generated at the moment of startup, which may trigger the overcurrent protection of the power supply unit that started first. Afterward, as long as the AC input of the system continues, that power supply unit will remain in an overcurrent latch-up state with no power output. At this time, other power supply units are still providing normal power output. When the system is fully loaded, other power supply units will work overloaded, affecting the stability of the system's power supply.

[0003] How to solve the problem of overcurrent self-locking of the power supply unit that powers on earlier due to surge current in a parallel power supply unit architecture is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] This invention provides a power supply unit and a server power supply system to at least solve the problem in the related art where, due to asynchronous power-up of the power supply units in a parallel architecture, the power supply unit that powers up first experiences overcurrent self-locking due to surge current.

[0005] This invention provides a power supply unit, comprising: a voltage conversion unit and an overcurrent protection unit; The overcurrent protection unit includes a first sampling circuit, a first voltage configuration circuit, a first voltage comparator, and an overcurrent protection control circuit; The first terminal of the first sampling circuit is located at the output terminal of the voltage conversion unit, the second terminal of the first sampling circuit is connected to the first input terminal of the first voltage comparator, the variable voltage output terminal of the first voltage configuration circuit is connected to the second input terminal of the first voltage comparator, the output terminal of the first voltage comparator is connected to the first terminal of the overcurrent protection control circuit, and the second terminal of the overcurrent protection control circuit is connected to the enable terminal of the voltage conversion unit.

[0006] The present invention also provides a server power supply system, comprising multiple power supply units connected in parallel; The power supply unit includes: a voltage conversion unit and an overcurrent protection unit; The overcurrent protection unit includes a first sampling circuit, a first voltage configuration circuit, a first voltage comparator, and an overcurrent protection control circuit; The first terminal of the first sampling circuit is located at the output terminal of the voltage conversion unit, the second terminal of the first sampling circuit is connected to the first input terminal of the first voltage comparator, the variable voltage output terminal of the first voltage configuration circuit is connected to the second input terminal of the first voltage comparator, the output terminal of the first voltage comparator is connected to the first terminal of the overcurrent protection control circuit, and the second terminal of the overcurrent protection control circuit is connected to the enable terminal of the voltage conversion unit.

[0007] By configuring the overcurrent protection unit of the power supply unit as an adjustable overcurrent protection unit including a first sampling circuit, a first voltage configuration circuit, a first voltage comparator, and an overcurrent protection control circuit, the first sampling circuit collects the current at the output terminal of the voltage conversion unit and outputs it as a sampling voltage. The output terminal of the first sampling circuit and the variable voltage output terminal of the first voltage configuration circuit are connected to the two input terminals of the first voltage comparator. The output terminal of the first voltage comparator is connected to the first terminal of the overcurrent protection control circuit, and the second terminal of the overcurrent protection control circuit is connected to the enable terminal of the voltage conversion unit. This invention realizes an adjustable overcurrent protection unit with a variable overcurrent point based on a variable reference voltage. This allows the overcurrent protection control parameters of the voltage supply unit to be adjusted according to the surge current when the server is powered on, avoiding the problem of overcurrent self-locking due to surge current when some voltage supply units are powered on first. This improves the power supply stability of the parallel architecture of the power supply units, and thus improves the system operation stability of the server. Attached Figure Description

[0008] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 A parallel structure diagram of a power supply unit provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of an overcurrent protection unit provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of another overcurrent protection unit provided in an embodiment of the present invention; Figure 4 A circuit diagram for copper foil sampling provided in an embodiment of the present invention; Figure 5 A schematic diagram of the surge current when a power supply unit is powered on, provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of overcurrent protection triggering when a power supply unit is powered on, provided in an embodiment of the present invention. Figure 7 A power-on timing diagram of a power supply unit provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of a soft-start unit of a power supply unit provided in an embodiment of the present invention. Detailed Implementation

[0010] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present invention.

[0011] It should be noted that, in the description of this invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. The terms "first," "second," etc., used in this invention are used to distinguish similar objects and are not used to describe a specific order or sequence.

[0012] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0013] Here, we will first explain some key terms used in the embodiments of the present invention.

[0014] The purpose of a server's power supply unit (PSU) is to convert the input power (usually AC or DC) into the DC voltage (such as 12V, 5V, 3.3V, etc.) required by the server system to meet the power supply needs of various components inside the server. Power supply units can take many different designs and forms, such as power bricks.

[0015] A power brick is a small, modular power conversion device typically used to convert power from one voltage level to another. In server systems, power bricks are commonly used to convert input voltage (such as 54VDC) to the voltage required by the system (such as 12V).

[0016] When multiple power supply units are used in parallel, due to individual differences, some power supply units may start up first, while others start up later. If the equivalent capacitance at the output terminal is large, a large inrush current will be generated at the moment of startup, which may trigger the overcurrent protection of the power supply unit that started first. Afterward, as long as the system's AC power supply remains uninterrupted, that power supply unit will remain in an overcurrent latch-up state with no power output. Meanwhile, the other power supply units continue to supply power normally. When the system is fully loaded, the other power supply units will operate under overload conditions, leading to increased operating temperatures, decreased conversion efficiency, and a significant drop in system power supply stability and performance.

[0017] To address the issue of overcurrent self-locking caused by surge current in power supply units that power on asynchronously in a parallel power supply unit architecture, this invention provides a power supply unit and server power supply system. The overcurrent protection unit of the power supply unit is configured as an adjustable overcurrent protection unit comprising a first sampling circuit, a first voltage configuration circuit, a first voltage comparator, and an overcurrent protection control circuit. The first sampling circuit collects the current at the output of the voltage conversion unit and outputs it as a sampling voltage. The output of the first sampling circuit and the variable voltage output of the first voltage configuration circuit are combined. The first voltage comparator is connected to the two input terminals of the first voltage comparator. The output terminal of the first voltage comparator is connected to the first terminal of the overcurrent protection control circuit. The second terminal of the overcurrent protection control circuit is connected to the enable terminal of the voltage conversion unit. This realizes an adjustable overcurrent protection unit with a variable overcurrent point based on a variable reference voltage. This allows the overcurrent protection control parameters of the voltage supply unit to be adjusted according to the surge current when the server is powered on. This avoids the problem of overcurrent self-locking due to surge current when some voltage supply units are powered on first, thereby improving the power supply stability of the parallel architecture of the power supply units and thus improving the system operation stability of the server.

[0018] Figure 1 A parallel structure diagram of a power supply unit provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of an overcurrent protection unit provided in an embodiment of the present invention.

[0019] like Figure 1 As shown, the power supply unit provided in this embodiment of the invention may include a voltage conversion unit and an overcurrent protection unit.

[0020] like Figure 2 As shown, in this embodiment of the invention, the overcurrent protection unit includes a first sampling circuit, a first voltage configuration circuit, a first voltage comparator, and an overcurrent protection control circuit.

[0021] The first terminal of the first sampling circuit is located at the output terminal of the voltage conversion unit. The second terminal of the first sampling circuit is connected to the first input terminal of the first voltage comparator. The variable voltage output terminal of the first voltage configuration circuit is connected to the second input terminal of the first voltage comparator. The output terminal of the first voltage comparator is connected to the first terminal of the overcurrent protection control circuit. The second terminal of the overcurrent protection control circuit is connected to the enable terminal of the voltage conversion unit.

[0022] like Figure 2 As shown, this embodiment of the invention provides an adjustable overcurrent protection unit. By adjusting the first voltage configuration circuit, the output voltage of the variable voltage output terminal of the first voltage configuration circuit is adjusted, thereby adjusting the reference voltage at the second input terminal of the first voltage comparator. The first sampling circuit is used to convert the current magnitude of the output terminal VOUT of the voltage conversion unit into a voltage signal and output it. The first voltage comparator compares the sampled voltage of the first sampling circuit with the voltage value (reference voltage) of the variable voltage output terminal of the first voltage configuration circuit. If the sampled voltage is greater than the reference voltage, the output signal triggers the overcurrent protection control circuit to control the voltage conversion unit to turn off; otherwise, the overcurrent protection is not triggered.

[0023] The voltage conversion unit can be a DC-DC voltage conversion unit, used to convert the input voltage at the input terminal VIN into the output voltage and output it through the output terminal VOUT.

[0024] Using the power supply unit provided in this embodiment of the invention, a reference voltage can be configured according to the actual operating scenario of the power supply unit, thereby adjusting the overcurrent point of the overcurrent protection unit. For example, for the surge current at the start of the power supply unit, the overcurrent point can be appropriately raised according to the rated output current of the power supply unit, thereby ensuring that the instantaneous surge current does not trigger the overcurrent power failure of a single power supply unit while avoiding weakening the overcurrent protection capability of the output terminal of the power supply unit.

[0025] The power supply unit and server power supply system provided in this embodiment of the invention, by setting the overcurrent protection unit of the power supply unit as an adjustable overcurrent protection unit including a first sampling circuit, a first voltage configuration circuit, a first voltage comparator, and an overcurrent protection control circuit, collects the current at the output terminal of the voltage conversion unit through the first sampling circuit and outputs it as a sampling voltage. The output terminal of the first sampling circuit and the variable voltage output terminal of the first voltage configuration circuit are connected to the two input terminals of the first voltage comparator. The output terminal of the first voltage comparator is connected to the first terminal of the overcurrent protection control circuit, and the second terminal of the overcurrent protection control circuit is connected to the enable terminal of the voltage conversion unit. This realizes an adjustable overcurrent protection unit with a variable overcurrent point based on a variable reference voltage. This allows the overcurrent protection control parameters of the voltage supply unit to be adjusted according to the surge current when the server is powered on, avoiding the problem of overcurrent self-locking due to surge current when some voltage supply units are powered on first. This improves the power supply stability of the parallel architecture of the power supply units, and thus improves the system operation stability of the server.

[0026] The present invention provides a further description of the structure of the overcurrent protection unit.

[0027] Figure 3 This is a schematic diagram of another overcurrent protection unit provided in an embodiment of the present invention.

[0028] like Figure 3 As shown, in this embodiment of the invention, the first sampling circuit may include a copper foil and a first operational amplifier OP1; the copper foil is disposed at the output end of the voltage conversion unit, and the two ends of the copper foil are respectively connected to the two input ends of the first operational amplifier OP1, and the output end of the first operational amplifier OP1 is connected to the first input end of the first voltage comparator.

[0029] In other words, the copper foil at the output of the voltage conversion unit can be used as a sampling resistor, and the copper foil can be the copper foil on the printed circuit board where the voltage conversion unit is located.

[0030] The first operational amplifier OP1 is used to amplify the voltage across the copper foil; a MAX9634TEUK+T can be selected. The first voltage comparator can be an LM393A-SR.

[0031] Figure 4 This is a circuit diagram for copper foil sampling provided in an embodiment of the present invention.

[0032] like Figure 4 As shown, the copper foil of the 12V printed circuit board of the power supply unit can be used. Let the resistance of the copper foil be R_SEN. Set current sampling points P and N at both ends of the copper foil. Then the sampled currents at the two points are I_SENP and I_SENN, respectively. Then, as... Figure 3As shown, the current flowing through the copper foil is denoted as IOUT (i.e., the current at the output of the voltage conversion unit), and the voltage across the copper foil is denoted as V_ISEN. The voltage V_ISEN across the copper foil is amplified by the first operational amplifier OP1. It is then connected to the first input terminal of the first voltage comparator.

[0033] The second input terminal of the first voltage comparator is connected to the variable voltage output terminal of the first voltage configuration circuit, and the voltage output by the variable voltage output terminal is the reference voltage. The first voltage comparator is used for comparison. and reference voltage The value of the signal is determined, and the output signal T_EN is generated based on the comparison result.

[0034] The first voltage configuration circuit is used to implement the reference voltage. Adjustable. In this embodiment of the invention, the first voltage configuration circuit may include a first resistor circuit and a second resistor circuit; the first terminal of the first resistor circuit is connected to a first DC power supply, the second terminal of the first resistor circuit is connected to the first terminal of the second resistor circuit and serves as a variable voltage output terminal, and the second terminal of the second resistor circuit is grounded; at least one of the first resistor circuit and the second resistor circuit is a variable resistor circuit.

[0035] That is, a voltage divider circuit can be constructed by using a first resistor circuit and a second resistor circuit. At least one of the first and second resistor circuits can be a variable resistor circuit, allowing the voltage division value to change. Therefore, the connection point of the first and second resistor circuits can be used as the variable voltage output terminal of the first voltage configuration circuit to achieve a reference voltage. Adjustable.

[0036] In some optional embodiments of the present invention, the second resistor circuit may include a plurality of first resistor branches and a plurality of second resistors; the first resistor branch includes a first resistor and a first switch connected in series; for the first-stage first resistor branch, the first end of the first resistor branch is connected to the variable voltage output terminal, and the second end of the first resistor branch is grounded; for the second-stage and subsequent first resistor branches, the first end of the first resistor branch is connected to the second end of the corresponding second resistor, the second end of the first resistor branch is grounded, and the first end of the second resistor is connected to the first end of the first-stage first resistor branch preceding the first resistor branch.

[0037] like Figure 3As shown, the first terminal of the first resistor circuit is connected to the DC power supply VDD, and the second terminal of the second resistor circuit is grounded. The second terminal of the first resistor circuit and the first terminal of the second resistor circuit are connected as a variable voltage output terminal, forming a resistor voltage divider circuit. The first resistor circuit may include resistor R11. The second resistor circuit includes multiple first resistor branches and second resistors (R30, R31, ..., R3(n-2)). The first resistor branches may include first resistors (R20, R21, ..., R2(n-1)) connected in series and first switches (SW0, SW1, SW2, ..., SWn-1). By controlling the opening and closing of the first switches, the resistance value of the second resistor circuit can be changed, thereby achieving different voltage division values ​​at the variable voltage output terminal and realizing the reference voltage. Adjustable.

[0038] Based on this, the on / off state of each first switch can be controlled by signals S0, S1, S2, ..., Sn-1. For example, when the signal Si (i=0,1,2,...,n-1) is high, the corresponding first switch SWi (i=0,1,2,...,n-1) is closed, and when Si (i=0,1,2,...,n-1) is low, the corresponding first switch SWi (i=0,1,2,...,n-1) is open.

[0039] Taking n=8 as an example, assuming that all resistors in the first voltage configuration circuit have the same resistance value, and the DC power supply VDD has a voltage value of Then the signal Si and the reference voltage The correspondence is shown in Table 1. Table 1

[0040] In this way, the reference voltage can be controlled by the output signal Si. The size of the current source can be adjusted to allow for different current flow point settings.

[0041] In some alternative embodiments of the present invention, the second resistor circuit may also include multiple second resistor branches connected in parallel between the variable voltage output terminal and ground; each second resistor branch includes a third resistor and a second switch. That is, the second resistor circuit can also be configured as a circuit with multiple second resistor branches connected in parallel, and the reference voltage can be controlled by controlling the on / off state of the second switch in each second resistor branch. The size can be adjusted to allow for different current flow point settings.

[0042] In some optional embodiments of the present invention, the overcurrent protection control circuit may include a first AND gate circuit; the first input terminal of the first AND gate circuit is connected to the output terminal of the first voltage comparator, the second input terminal of the first AND gate circuit is connected to the enable control terminal of the voltage conversion unit, and the output terminal of the first AND gate circuit is connected to the enable terminal of the voltage conversion unit.

[0043] In specific implementation, the first voltage comparator is configured to output a low level when the output voltage of the first sampling circuit is greater than the reference voltage, and a high level when the output voltage of the first sampling circuit is less than the reference voltage, thus setting the enable signal of the voltage conversion unit to be active high. The signal output by the first voltage comparator is then ANDed with the enable signal of the voltage conversion unit. If the output voltage of the first sampling circuit is less than the reference voltage (i.e., the overcurrent point has not been reached), the first voltage comparator outputs a high level, and the result of the AND operation with the high-level enable signal is a high-level output, enabling the voltage conversion unit. If the output voltage of the first sampling circuit is greater than the reference voltage (i.e., the overcurrent point has been exceeded), the first voltage comparator outputs a low level, and the result of the AND operation with the high-level enable signal is a low-level output, turning off the voltage conversion unit.

[0044] In addition, the enable signals of the first voltage comparator and the voltage conversion unit can also be set to other control logic, and the first AND gate circuit can be replaced with the corresponding control circuit.

[0045] Using only gate circuits, overcurrent protection can only be triggered when the output current of the voltage conversion unit reaches the overcurrent point. To avoid error disturbances, the state of the output current of the voltage conversion unit reaching the overcurrent point can be timed to avoid frequent shutdown of the voltage conversion unit. In this embodiment of the invention, the overcurrent protection control circuit may further include a first controller; the first input terminal of the first controller is connected to the output terminal of the first voltage comparator, and the first output terminal of the first controller is connected to the enable terminal of the voltage conversion unit. The overcurrent protection control circuit may further include a second AND gate circuit; the first input terminal of the second AND gate circuit is connected to the first output terminal of the first controller, the second input terminal of the second AND gate circuit is connected to the enable control terminal of the voltage conversion unit, and the output terminal of the second AND gate circuit is connected to the enable terminal of the voltage conversion unit.

[0046] In this embodiment of the invention, the first controller is used to time the first signal output by the first voltage comparator, and outputs an overcurrent protection signal at the first output terminal of the first controller when the time reaches the overcurrent protection time; the first voltage comparator is used to output the first signal when the voltage at the first input terminal of the first voltage comparator is greater than the voltage at the second input terminal of the first voltage comparator.

[0047] The first controller can be a microcontroller unit (MC) with timing function, such as T113-S3.

[0048] In other words, the first controller can be used to time the state of the output current of the voltage conversion unit reaching the overcurrent point. If the state of the output current of the voltage conversion unit reaching the overcurrent point lasts for the overcurrent protection timer, the voltage conversion unit is then controlled to turn off. If the state of the output current of the voltage conversion unit reaching the overcurrent point does not last for the overcurrent protection timer, the timing is reset the next time the output current of the voltage conversion unit reaches the overcurrent point.

[0049] Therefore, by configuring the timing of the first controller to be the overcurrent protection timing, the timing judgment of the output current of the voltage conversion unit reaching the overcurrent point can be realized.

[0050] Figure 5 A schematic diagram of the surge current when a power supply unit is powered on, provided in an embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the overcurrent protection triggering when a power supply unit is powered on, provided as an embodiment of the present invention.

[0051] like Figure 5 As shown, taking two power supply units VRM0 and VRM1 connected in parallel as an example, assuming that the overcurrent protection current (overcurrent point) of both VRM0 and VRM1 is I_OCP, at the moment of power-on, VRM0 powers on first, followed by VRM1. Therefore, VRM0 first outputs the voltage VOUT to establish the output voltage across the capacitor C at the output terminal. OUT Charging generates a momentary inrush current I_INRUSH. At this time, the entire inrush current I_INRUSH is applied to the power supply unit VRM0.

[0052] If I_OCP ≤ I_INRUSH < 2 * I_OCP, power supply unit VRM0 will trigger overcurrent protection and lock the output. Then, power supply unit VRM1 will power on and generate output voltage VOUT. After the output voltage is established, only power supply unit VRM1 supplies power to the downstream load. If the downstream load continues to operate at full load, the operating temperature of power supply unit VRM1 will inevitably rise. When the load peak current I_PK (e.g., when the acceleration card is pressurized during Electrical Data Peak Processing (EDPP)) exceeds I_OCP, there is a risk that power supply unit VRM1 will shut down.

[0053] Therefore, the overcurrent point of power supply units VRM0 and VRM1 can be appropriately raised to I_OCP'. Simultaneously, adjusting the overcurrent protection timing T_HOLD of the current holding function makes: I_OCP <I_OCP’<2*I_OCP;(1) T_HOLD≥Td;(2) Where I_OCP is the original overcurrent point of the power supply unit, T_HOLD is the overcurrent protection timing time, and Td is the duration of the overcurrent point triggered by the surge current at the output of the voltage supply unit.

[0054] When the overcurrent point and overcurrent protection timing of power supply units VRM0 and VRM1 are adjusted to meet (1) and (2) through the first voltage configuration circuit, it can be guaranteed that when power supply units VRM0 and VRM1 are powered on, under the condition that there is a power-on sequence, neither power supply unit will trigger the overcurrent protection.

[0055] In this embodiment of the invention, the configuration of the first voltage configuration circuit can also be implemented by a first controller. The second output terminal of the first controller can then be connected to the output voltage adjustment terminal of the first voltage configuration circuit. If the specific structure of the first voltage configuration circuit described in this embodiment of the invention is adopted, the resistance adjustment terminal of the first voltage configuration circuit is also the control terminal of each first switch or the control terminal of the second switch.

[0056] The power supply unit provided in this embodiment of the invention may further include a first non-volatile storage component (such as...). Figure 3 The first controller is also used to read the overcurrent protection control parameters stored in the first non-volatile storage component and control the output voltage of the first voltage configuration circuit according to the overcurrent protection control parameters. The first non-volatile storage component is used to store the overcurrent protection control parameters of the overcurrent protection unit, such as the overcurrent protection reference voltage and the overcurrent protection timing time. Figure 3 In the first voltage configuration circuit shown, the overcurrent protection reference voltage in the overcurrent protection control parameters can be represented by the value of signal Si (i=0,1,2,…,n-1).

[0057] The first non-volatile storage component can be an electrically erasable programmable read-only memory (EEPROM), such as the M24256-BRMN6TP.

[0058] To adjust the overcurrent protection control parameters, a first non-volatile storage component can be connected to a first debugging interface of the power supply unit to receive overcurrent protection control parameters written from the first debugging interface. The overcurrent protection control parameters include at least one of an overcurrent protection reference voltage and an overcurrent protection timing period. The first debugging interface can use a two-wire serial bus (Inter-Integrated Circuit, I2C) interface. After connecting to the first debugging interface via hardware devices such as a baseboard management controller (BMC) or a debug dongle, the overcurrent protection control parameters can be written to the first non-volatile storage component. Thus, the first controller can read the overcurrent protection control parameters from the first non-volatile storage component and configure the overcurrent protection timing period, as well as configure or update the reference voltage output by the first voltage configuration circuit offline or online.

[0059] but Figure 3 The operation of the overcurrent protection unit shown includes: the output current of the power supply unit passes through copper foil (such as...) Figure 4 (As shown) This will generate a voltage signal V_ISEN, which is amplified by the first operational amplifier OP1 and then output as a signal. . Reference voltage inside the signal and power supply unit Make comparisons (where, The register value can be set via the first non-volatile storage component: [Sn-1,…,S2,S1,S0]).

[0060] Simultaneously, the first controller reads the overcurrent protection timing from the first non-volatile storage component and configures the register value [Dm-1,…,D2,D1,D0] to set the overcurrent protection timing T_HOLD; where m represents the number of time points for the overcurrent protection timing. T_HOLD is implemented based on the registers inside the first controller. For example, if D=[D15,…,D2,D1,D0] is set, the overcurrent protection timing T_HOLD can be expressed by the following formula: ; in, This is the clock cycle when the first controller is operating. This is the timer value.

[0061] when ≥ This indicates that the surge current at the output of the voltage conversion unit exceeds the overcurrent point, triggering overcurrent protection. At this time, the first voltage comparator processes the signal and generates a high-level signal T_EN. The first controller detects that the high-level signal T_EN has been active for the overcurrent protection timer T_HOLD and outputs a control signal VRM_SHUT. VRM_SHUT is ANDed with the enable signal of the voltage conversion unit, and the output signal EN_VRM' controls the voltage conversion unit to shut down, thus stopping the power supply unit from operating. When... < At this time, the overcurrent protection will not be triggered, and the power supply unit will output voltage normally.

[0062] In this embodiment of the invention, the first controller can also be used to configure the first voltage configuration circuit according to the first overcurrent protection control parameters after startup; the first controller is also used to configure the first voltage configuration circuit according to the second overcurrent protection control parameters after determining that the device where the power supply unit is located has completed the power-on startup process.

[0063] In other words, during the startup process of the equipment, the power supply unit will be subjected to surge current. At this time, the first overcurrent protection control parameter can be set to adapt to the surge current. After the equipment enters the operating state, the output current of the power supply unit is affected by the operating conditions of the equipment. At this time, the second overcurrent protection control parameter can be set to adapt to the operating conditions of the equipment.

[0064] In this embodiment of the invention, the power-on monitoring time can be set to distinguish between the power-on process and the normal operation stage. That is, the power-on process time of the device is determined in advance by testing, and the power-on monitoring time exceeding this time is set as the time for using the first overcurrent protection control parameter. When the time exceeds the power-on monitoring time, the second overcurrent protection control parameter is used.

[0065] The difference between the first overcurrent protection control parameter and the second overcurrent protection control parameter can be that the overcurrent protection reference voltage is different and / or the overcurrent protection timing time is different.

[0066] When a power supply unit is applied to a power supply system in which multiple power supply units are connected in parallel, if the power supply units do not start simultaneously, the surge current impact they experience will often be different. Therefore, in this embodiment of the invention, the first controller configuring the first voltage configuration circuit according to the first overcurrent protection control parameters may further include: the first controller determining the first overcurrent protection control parameters based on the startup sequence of the power supply unit within the device, and configuring the first voltage configuration circuit according to the first overcurrent protection control parameters.

[0067] For example, under the same surge current, the power supply unit that starts first will be subjected to a larger surge current impact and is more likely to trigger overcurrent protection. Therefore, the first overcurrent control parameters of each power supply unit can be configured in such a way that the earlier the startup sequence, the higher the first overcurrent protection control parameter (the larger the overcurrent protection reference voltage and / or the longer the overcurrent protection timing time).

[0068] The above embodiments describe a method for configuring an overcurrent protection unit by writing overcurrent protection control parameters into a first non-volatile storage component via an external debugging device. In addition, in some optional embodiments of the present invention, the overcurrent protection unit can also be adaptively configured by a first controller.

[0069] In this embodiment of the invention, the first controller can also be used to record historical sampling data at the output of the voltage conversion unit and determine the overcurrent protection control parameters of the power supply unit based on the historical sampling data; the overcurrent protection control parameters include at least one of the overcurrent protection reference voltage and the overcurrent protection timing time.

[0070] To reduce the impact of surge current during startup on the power supply unit, the power supply unit may also include a soft-start unit. In specific implementations, the soft-start unit can be implemented using an RC circuit or other forms of soft-start unit to achieve a delay between power-on at the power input terminal VIN of the power supply unit and startup of the voltage conversion unit.

[0071] It is evident that in a power supply system with multiple power supply units connected in parallel, the startup sequence of each power supply unit is affected not only by the hardware differences of the power supply units, but also by the delay control effect of the soft-start unit.

[0072] Figure 7 A power-on timing diagram for a power supply unit provided in an embodiment of the present invention.

[0073] like Figure 7 As shown, after the power supply unit input voltage (P54V_IN) becomes valid, the power supply unit enable signal (EN_VRM) is subsequently issued to enable the voltage conversion unit. However, the voltage conversion unit does not output voltage at this time; instead, it waits to receive the soft-start control signal (SS) before the power supply unit output voltage (P12V) starts working. Then, the power-on completion pin (PG) of the power supply unit outputs the power-on completion signal (VRM_PG). It can be seen that the output voltage time of the power supply unit is synchronized with the soft-start control signal. Therefore, the rise time for the power supply unit output voltage to reach its rated value is the soft-start time Tss.

[0074] To achieve synchronous startup of different power supply units as much as possible, in this embodiment of the invention, when the power supply unit includes a soft-start unit, the soft-start time setting pin of the soft-start unit can be connected to the soft-start time setting pin of other power supply units in the device where the power supply unit is located.

[0075] like Figure 1 As shown, the soft-start time setting pin of the soft-start unit of the power supply unit can be brought out of the power supply unit, and the soft-start time setting pins of different power supply units can be connected to make the soft-start times of different power supply units converge.

[0076] When the soft-start unit can be built using a resistor-capacitor circuit, the soft-start time setting pin is one end of the first capacitor in the resistor-capacitor circuit.

[0077] Figure 8 This is a schematic diagram of the structure of a soft-start unit of a power supply unit provided in an embodiment of the present invention. Figure 8 As shown, the soft-start unit includes a resistor R1 and a first capacitor C1. The first end of resistor R1 is connected to the voltage output terminal VOUT of the voltage conversion unit U1, and the second end of resistor R1 is connected to the first end of the first capacitor C1. The second end of the first capacitor C1 is grounded. At this time, the soft-start time setting pin is the end of the first capacitor C1 connected to resistor R1. Connecting the soft-start time setting pins of different power supply units together is equivalent to connecting the first capacitors in different power supply units in parallel. The soft-start time of each power supply unit is determined by the capacitance value of the parallel capacitor circuit.

[0078] To further reduce the impact of surge current, such as Figure 3 As shown, the soft-start time setting pin can also be connected to a second capacitor Css external to the power supply unit, so that the first capacitor and the second capacitor Css are connected in parallel. That is to say, a second capacitor Css can also be set external to the power supply unit, and the soft-start time setting pin of each power supply unit can be connected to the second capacitor Css, so that multiple first capacitors and second capacitors Css are connected in parallel to form a capacitor with a larger capacitance, thereby further extending the soft-start time of each power supply unit.

[0079] Let the capacitance of the first and second capacitors connected in parallel be Css'. Then the soft-start time of each power supply unit is shown in the following formula: Tss=k*Css'; Where Tss is the soft start time and k is a proportional constant.

[0080] Therefore, in this embodiment of the invention, the soft-start time setting pin of the control voltage conversion unit inside the power supply unit is brought out, and the soft-start time setting pins of the parallel power supply units are interconnected. A second capacitor Css is connected externally to the power supply unit to synchronize the soft-start creepage actions of multiple power supply units when they are connected in parallel, thereby reducing the inrush current during startup. Furthermore, through the overcurrent protection unit inside the power supply unit, appropriate overcurrent protection control parameters are set to adapt to the inrush current during the startup phase, preventing a single power supply unit from triggering the overcurrent protection self-locking.

[0081] This invention also provides a server power supply system, including multiple power supply units connected in parallel.

[0082] The power supply unit includes a voltage conversion unit and an overcurrent protection unit.

[0083] The overcurrent protection unit includes a first sampling circuit, a first voltage configuration circuit, a first voltage comparator, and an overcurrent protection control circuit.

[0084] The first terminal of the first sampling circuit is located at the output terminal of the voltage conversion unit. The second terminal of the first sampling circuit is connected to the first input terminal of the first voltage comparator. The variable voltage output terminal of the first voltage configuration circuit is connected to the second input terminal of the first voltage comparator. The output terminal of the first voltage comparator is connected to the first terminal of the overcurrent protection control circuit. The second terminal of the overcurrent protection control circuit is connected to the enable terminal of the voltage conversion unit.

[0085] In this embodiment of the invention, the power supply unit may further include a soft-start unit; the soft-start time setting pins of the soft-start units of different power supply units are interconnected.

[0086] like Figure 1 As shown, two power supply units (VRM0, VRM1) are connected in parallel, with their back ends connected to branches of different accelerator cards (accelerator card 0, accelerator card 1, ..., accelerator card 7). Each accelerator card branch is equipped with an EFUSE (Fuse 0, Fuse 1, ..., Fuse 7). The two power supply units, connected in parallel, convert the input power supply (P54V_IN) to the output power supply (P12V). The voltage input terminals VIN and VOUT of the two power supply units are interconnected, and the current sharing bus pin (ISHARE) is interconnected (to achieve load balancing adjustment when the two power supply units are operating). PG_VRM0 and PG_VRM1 are the power-on completion pins (PG) of the two power supply units, used to indicate that the output voltage setup is complete.

[0087] Using the power supply unit provided in this embodiment of the invention, in the design of an artificial intelligence server, if eight accelerator cards are deployed and installed on a system substrate, the accelerator cards are divided into two groups, with each group of four accelerator cards having a total power of 1800W, and a 2000W power supply unit is selected. The two 2000W power supply units (VRM0 and VRM1) internally include soft-start units (Soft Start0 and Soft Start1, respectively), a first non-volatile memory component, an overcurrent protection unit, and a debugging interface, with the soft-start time setting pin (SS) interconnected. Based on the rated current Imax of the 2000W power supply unit, the overcurrent point (setting the overcurrent protection reference voltage) of the power supply unit can be set according to 1.2~1.5*Imax. Based on the overcurrent point and the capacitive load size at the output of the power supply unit, the soft-start time of the power supply unit is determined, and a suitable soft-start capacitor (second capacitor Css) is selected.

[0088] This invention provides a control method for a power supply unit, applied to a first controller in the power supply unit. The method may include: when a first signal is received from a first voltage comparator at a first input terminal, outputting a low level to the input terminal of a second AND gate circuit, so as to turn off the voltage conversion unit after performing an AND operation with the enable signal of the voltage conversion unit via the second AND gate circuit; and when a second signal is received from the first voltage comparator at the first input terminal, outputting a high level to the input terminal of the second AND gate circuit, so as to control the on / off state of the voltage conversion unit based on the enable signal of the voltage conversion unit after performing an AND operation with the enable signal of the voltage conversion unit via the second AND gate circuit.

[0089] The first controller is located in the overcurrent protection unit of the power supply unit. The overcurrent protection unit also includes a first sampling circuit, a first voltage configuration circuit, a first voltage comparator, and an overcurrent protection control circuit. The overcurrent protection control circuit includes the first controller and a second AND gate circuit. The first terminal of the first sampling circuit is located at the output terminal of the voltage conversion unit, and the second terminal of the first sampling circuit is connected to the first input terminal of the first voltage comparator. The variable voltage output terminal of the first voltage configuration circuit is connected to the second input terminal of the first voltage comparator, the output terminal of the first voltage comparator is connected to the first terminal of the overcurrent protection control circuit, and the second terminal of the overcurrent protection control circuit is connected to the enable terminal of the voltage conversion unit.

[0090] The control method for the power supply unit provided in this embodiment of the invention may further include: timing the first signal output by the first voltage comparator, and outputting an overcurrent protection signal at the first output terminal of the first controller when the timing reaches the overcurrent protection timing time; the first voltage comparator is used to output the first signal when the voltage at the first input terminal of the first voltage comparator is greater than the voltage at the second input terminal of the first voltage comparator.

[0091] The control method for the power supply unit provided in this embodiment of the invention may further include: reading overcurrent protection control parameters stored in a first non-volatile storage component, and controlling the output voltage of a first voltage configuration circuit according to the overcurrent protection control parameters.

[0092] The control method for the power supply unit provided in this embodiment of the invention may further include: configuring a first voltage configuration circuit according to a first overcurrent protection control parameter after startup; and configuring the first voltage configuration circuit according to a second overcurrent protection control parameter after determining that the device where the power supply unit is located has completed the power-on startup process.

[0093] The control method for the power supply unit provided in this embodiment of the invention may further include: determining a first overcurrent protection control parameter according to the startup sequence of the power supply unit in the power supply unit of the device, and configuring a first voltage configuration circuit according to the first overcurrent protection control parameter.

[0094] The control method for the power supply unit provided in this embodiment of the invention may further include: recording historical sampling data at the output of the voltage conversion unit, and determining overcurrent protection control parameters of the power supply unit based on the historical sampling data; the overcurrent protection control parameters include at least one of overcurrent protection reference voltage and overcurrent protection timing.

[0095] For a description of the features of the control device of the power supply unit in the corresponding embodiment, please refer to the relevant description of the control method of the power supply unit in the corresponding embodiment, which will not be repeated here.

[0096] Embodiments of the present invention also provide a control device for a power supply unit, which is applied to a first controller in the power supply unit. The controller may include: a first control unit, configured to output a low level to the input of a second AND gate circuit when a first signal is received from the first input terminal of a first voltage comparator, so as to turn off the voltage conversion unit after performing an AND operation with the enable signal of the voltage conversion unit via the second AND gate circuit; and a second control unit, configured to output a high level to the input of the second AND gate circuit when a second signal is received from the first input terminal of the first voltage comparator, so as to control the on / off state of the voltage conversion unit based on the enable signal of the voltage conversion unit after performing an AND operation with the enable signal of the voltage conversion unit via the second AND gate circuit.

[0097] The first controller is located in the overcurrent protection unit of the power supply unit. The overcurrent protection unit also includes a first sampling circuit, a first voltage configuration circuit, a first voltage comparator, and an overcurrent protection control circuit. The overcurrent protection control circuit includes the first controller and a second AND gate circuit. The first terminal of the first sampling circuit is located at the output terminal of the voltage conversion unit, and the second terminal of the first sampling circuit is connected to the first input terminal of the first voltage comparator. The variable voltage output terminal of the first voltage configuration circuit is connected to the second input terminal of the first voltage comparator, the output terminal of the first voltage comparator is connected to the first terminal of the overcurrent protection control circuit, and the second terminal of the overcurrent protection control circuit is connected to the enable terminal of the voltage conversion unit.

[0098] The control device for the power supply unit provided in this embodiment of the invention may further include: a timing unit, used to time the first signal output by the first voltage comparator, and to output an overcurrent protection signal at the first output terminal of the first controller when the timing reaches the overcurrent protection timing time; the first voltage comparator is used to output the first signal when the voltage at the first input terminal of the first voltage comparator is greater than the voltage at the second input terminal of the first voltage comparator.

[0099] The control device for the power supply unit provided in this embodiment of the invention may further include: a reading unit, used to read overcurrent protection control parameters stored in the first non-volatile storage component, and control the output voltage of the first voltage configuration circuit according to the overcurrent protection control parameters.

[0100] The control device for the power supply unit provided in this embodiment of the invention may further include: a first configuration unit, configured to configure a first voltage configuration circuit according to a first overcurrent protection control parameter after startup; and configured the first voltage configuration circuit according to a second overcurrent protection control parameter after determining that the device where the power supply unit is located has completed the power-on startup process.

[0101] The control device for the power supply unit provided in this embodiment of the invention may further include: a second configuration unit, configured to determine a first overcurrent protection control parameter according to the startup sequence of the power supply unit in the device, and to configure a first voltage configuration circuit according to the first overcurrent protection control parameter.

[0102] The control device for the power supply unit provided in this embodiment of the invention may further include: a third configuration unit, used to record historical sampling data of the output terminal of the voltage conversion unit, and determine the overcurrent protection control parameters of the power supply unit based on the historical sampling data; the overcurrent protection control parameters include at least one of overcurrent protection reference voltage and overcurrent protection timing time.

[0103] For a description of the features of the control device of the power supply unit in the corresponding embodiment, please refer to the relevant description of the control method of the power supply unit in the corresponding embodiment, which will not be repeated here.

[0104] Embodiments of the present invention also provide an electronic device, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the steps in any of the above-described embodiments of the control method for a power supply unit.

[0105] Embodiments of the present invention also provide a non-volatile storage medium storing a computer program, wherein the computer program is configured to execute the steps in any of the above-described power supply unit control method embodiments when running.

[0106] In one exemplary embodiment, the aforementioned non-volatile storage medium may include, but is not limited to, various media capable of storing computer programs, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0107] Embodiments of the present invention also provide a computer program product, which includes a computer program that, when executed by a processor, implements the steps in any of the above-described power supply unit control method embodiments.

[0108] Embodiments of the present invention also provide another computer program product, including a non-volatile storage medium storing a computer program, which, when executed by a processor, implements the steps in any of the above-described power supply unit control method embodiments.

[0109] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method.

[0110] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0111] The power supply unit and server power supply system provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only intended to help understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A power supply unit, characterized in that, include: Voltage conversion unit and overcurrent protection unit; The overcurrent protection unit includes a first sampling circuit, a first voltage configuration circuit, a first voltage comparator, and an overcurrent protection control circuit; The first terminal of the first sampling circuit is located at the output terminal of the voltage conversion unit, the second terminal of the first sampling circuit is connected to the first input terminal of the first voltage comparator, the variable voltage output terminal of the first voltage configuration circuit is connected to the second input terminal of the first voltage comparator, the output terminal of the first voltage comparator is connected to the first terminal of the overcurrent protection control circuit, and the second terminal of the overcurrent protection control circuit is connected to the enable terminal of the voltage conversion unit.

2. The power supply unit according to claim 1, characterized in that, The first voltage configuration circuit includes a first resistor circuit and a second resistor circuit; The first terminal of the first resistor circuit is connected to the first DC power supply, the second terminal of the first resistor circuit is connected to the first terminal of the second resistor circuit and serves as the variable voltage output terminal, and the second terminal of the second resistor circuit is grounded. At least one of the first resistor circuit and the second resistor circuit is a variable resistor circuit.

3. The power supply unit according to claim 2, characterized in that, The second resistor circuit includes multiple first resistor branches and multiple second resistors; The first resistor branch includes a first resistor and a first switch connected in series; For the first resistor branch of the first stage, the first end of the first resistor branch is connected to the variable voltage output terminal, and the second end of the first resistor branch is grounded; For the first resistor branch in the second stage and thereafter, the first end of the first resistor branch is connected to the second end of the corresponding second resistor, the second end of the first resistor branch is grounded, and the first end of the second resistor is connected to the first end of the first resistor branch in the previous stage.

4. The power supply unit according to claim 2, characterized in that, The second resistor circuit includes multiple second resistor branches connected in parallel between the variable voltage output terminal and ground; The second resistor branch includes a third resistor and a second switch.

5. The power supply unit according to claim 1, characterized in that, The overcurrent protection control circuit includes a first AND gate circuit; The first input terminal of the first AND gate circuit is connected to the output terminal of the first voltage comparator, the second input terminal of the first AND gate circuit is connected to the enable control terminal of the voltage conversion unit, and the output terminal of the first AND gate circuit is connected to the enable terminal of the voltage conversion unit.

6. The power supply unit according to claim 1, characterized in that, The overcurrent protection control circuit includes a first controller; The first input terminal of the first controller is connected to the output terminal of the first voltage comparator, and the first output terminal of the first controller is connected to the enable terminal of the voltage conversion unit.

7. The power supply unit according to claim 6, characterized in that, The overcurrent protection control circuit also includes a second AND gate circuit; The first input terminal of the second AND gate is connected to the first output terminal of the first controller, the second input terminal of the second AND gate is connected to the enable control terminal of the voltage conversion unit, and the output terminal of the second AND gate is connected to the enable terminal of the voltage conversion unit.

8. The power supply unit according to claim 6, characterized in that, The first controller is used to time the first signal output by the first voltage comparator, and output an overcurrent protection signal at the first output terminal of the first controller when the time reaches the overcurrent protection time. The first voltage comparator is used to output the first signal when the voltage at the first input terminal of the first voltage comparator is greater than the voltage at the second input terminal of the first voltage comparator.

9. The power supply unit according to claim 6, characterized in that, The second output terminal of the first controller is connected to the output voltage adjustment terminal of the first voltage configuration circuit.

10. The power supply unit according to claim 9, characterized in that, It also includes a first non-volatile storage component; The first controller is also configured to read the overcurrent protection control parameters stored in the first non-volatile storage component, and control the output voltage of the first voltage configuration circuit according to the overcurrent protection control parameters.

11. The power supply unit according to claim 10, characterized in that, The first non-volatile storage component is also connected to the first debugging interface of the power supply unit to receive the overcurrent protection control parameters written from the first debugging interface; The overcurrent protection control parameters include at least one of the following: overcurrent protection reference voltage and overcurrent protection timing.

12. The power supply unit according to claim 9, characterized in that, The first controller is also configured to configure the first voltage configuration circuit according to the first overcurrent protection control parameters after startup; The first controller is also used to configure the first voltage configuration circuit according to the second overcurrent protection control parameters after determining that the device where the power supply unit is located has completed the power-on process.

13. The power supply unit according to claim 12, characterized in that, The first controller configures the first voltage configuration circuit according to the first overcurrent protection control parameters, including: The first controller determines the first overcurrent protection control parameters according to the startup sequence of the power supply unit in the device and the startup sequence, so as to configure the first voltage configuration circuit according to the first overcurrent protection control parameters.

14. The power supply unit according to claim 6, characterized in that, The first controller is also used to record historical sampling data at the output of the voltage conversion unit and determine the overcurrent protection control parameters of the power supply unit based on the historical sampling data; The overcurrent protection control parameters include at least one of the following: overcurrent protection reference voltage and overcurrent protection timing.

15. The power supply unit according to claim 1, characterized in that, The first sampling circuit includes copper foil and a first operational amplifier; The copper foil is disposed at the output end of the voltage conversion unit, and the two ends of the copper foil are respectively connected to the two input ends of the first operational amplifier. The output end of the first operational amplifier is connected to the first input end of the first voltage comparator.

16. The power supply unit according to claim 1, characterized in that, It also includes a soft-start unit, wherein the soft-start time setting pin of the soft-start unit is connected to the soft-start time setting pin of other power supply units in the device where the power supply unit is located.

17. The power supply unit according to claim 16, characterized in that, The soft-start unit includes a resistor-capacitor circuit, and the soft-start time setting pin is one end of the first capacitor in the resistor-capacitor circuit.

18. The power supply unit according to claim 17, characterized in that, The soft-start time setting pin is also connected to a second capacitor outside the power supply unit, so that the first capacitor and the second capacitor are connected in parallel.

19. A server power supply system, characterized in that, It includes multiple power supply units connected in parallel; The power supply unit includes: a voltage conversion unit and an overcurrent protection unit; The overcurrent protection unit includes a first sampling circuit, a first voltage configuration circuit, a first voltage comparator, and an overcurrent protection control circuit; The first terminal of the first sampling circuit is located at the output terminal of the voltage conversion unit, the second terminal of the first sampling circuit is connected to the first input terminal of the first voltage comparator, the variable voltage output terminal of the first voltage configuration circuit is connected to the second input terminal of the first voltage comparator, the output terminal of the first voltage comparator is connected to the first terminal of the overcurrent protection control circuit, and the second terminal of the overcurrent protection control circuit is connected to the enable terminal of the voltage conversion unit.

20. The server power supply system according to claim 19, characterized in that, The power supply unit also includes a soft-start unit; The soft-start time setting pins of the soft-start units of the different power supply units are interconnected.

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