Server power panel current slow-start device and server power panel

Abstract

The invention relates to the technical field of power supplies, and discloses a server power panel current slow-start device and a server power panel, the slow-start device comprises a voltage monitor, a control circuit, a switching circuit and a current limiting circuit, when the power panel is powered on, the control circuit sends a conduction signal to the switching circuit, and the current limiting circuit is switched on; the voltage monitor monitors the voltage of the load end of the server and feeds back the voltage to the control circuit; when the voltage of the load end of the server reaches the preset voltage, the control circuit sends a turn-off signal to the switching circuit, so that the current slowly flows to the load through the current limiting circuit, the problem that the impact current is too large in the power-on process is solved, and a rear-end load and a non-linear component are protected.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a current slow-start device for a server power board and a server power board. Background Art

[0002] The server provides computing or application services for other clients (such as PCs, smart phones, ATMs and other terminals, and even large equipment such as train systems) in the network. The server has high-speed CPU computing power, long-term reliable operation, strong I / O external data throughput capacity and better scalability. According to the services provided by the server, generally speaking, the server has the ability to respond to service requests, provide services, and ensure services. As an electronic device, the internal structure of the server is very complex, but it is not much different from the internal structure of an ordinary computer, such as: CPU, hard disk, memory, system, system bus, etc.

[0003] However, as big data and AI computing are increasingly used in major Internet, banking, and service systems, higher requirements are placed on server performance and requirements. The operating current of the server is also increasing, and due to the corresponding increase in load, the capacity of the nonlinear load in the overall server link is also increasing. The increase in the capacity of the nonlinear load will cause the impact current to increase when the server is turned on, resulting in a large transient current on the nonlinear load at the back end of the memory. When the nonlinear load current is large, it causes the overvoltage protection and overcurrent protection of the input memory to be falsely triggered, or causes thermal damage to the memory. In severe cases, the server will crash and restart, which will have an adverse effect on the overall stability of the server. Summary of the invention

[0004] In view of this, the present invention provides a current slow-start device for a server power board and a server power board to solve the problem of how to achieve slow-start of the server power board.

[0005] In the first aspect, the present invention provides a current slow-start device for a server power board, comprising: a voltage monitor, a control circuit, a switch circuit and a current limiting circuit, wherein the first end of the voltage monitor is connected to the output end of the main power supply circuit of the server load, and the second end of the voltage monitor is connected to the first end of the control circuit; the second end of the control circuit is connected to the control end of the switch circuit; the first end of the switch circuit is connected to the input end of the main power supply circuit of the server load, and the second end of the switch circuit is connected to the first end of the current limiting circuit; the second end of the current limiting circuit is connected to the output end of the main power supply circuit of the server load; the input end of the main power supply circuit of the server load is connected to the output end of the power board, and the output end of the main power supply circuit of the server load is connected to the load; when the power board is powered on, the control circuit sends a conduction signal to the switch circuit, and the voltage monitor monitors the voltage at the server load end and feeds back to the control circuit; when the voltage at the server load end reaches a preset voltage, the control circuit sends a shutdown signal to the switch circuit.

[0006] In the present invention, when the switch circuit is turned on and the main power supply circuit is disconnected, the output voltage of the server power board is transmitted to the current limiting circuit through the switch circuit, and the current limiting circuit limits the voltage and then transmits it to the server load to avoid current overshoot; when the switch circuit is turned off and the main power supply circuit is turned on, the output voltage of the server power board is transmitted to the server load through the main power supply circuit, so that the current slowly flows to the load through the current limiting circuit to suppress the problem of excessive impact current during the power-on process and protect the back-end load and nonlinear components.

[0007] In an optional embodiment, the voltage monitor includes: a voltage conversion circuit and a voltage conditioning circuit, wherein the first end of the voltage conversion circuit is connected to the output end of the main power supply circuit of the server load, and the second end of the voltage conversion circuit is connected to the first end of the voltage conditioning circuit; the second end of the voltage conditioning circuit is connected to the first end of the control circuit; when the power board is powered on, the control circuit sends a conduction signal to the switching circuit, the voltage conversion circuit monitors the voltage at the server load end, the voltage conversion circuit steps down and converts the voltage at the server load end to obtain a differential voltage signal; the voltage conditioning circuit differentially amplifies and voltage follows the differential voltage signal and then feeds it back to the control circuit.

[0008] In an optional embodiment, the voltage conversion circuit includes: a step-down circuit and a differential voltage circuit, wherein a first end of the step-down circuit is connected to an output end of a main power supply circuit of a server load, and a second end of the step-down circuit is connected to a first end of the differential voltage circuit; a second end of the differential voltage circuit is connected to an output end of a main power supply circuit of a server load, and a third end of the differential voltage circuit is connected to a first end of a voltage conditioning circuit; when the power board is powered on, the control circuit sends a conduction signal to the switching circuit, the step-down circuit steps down the voltage at the server load end, and the differential voltage circuit performs voltage conversion on the stepped-down voltage at the server load end to obtain a differential voltage signal.

[0009] In an optional implementation, the voltage-dropping circuit includes: a plurality of voltage-dropping resistors, wherein the plurality of voltage-dropping resistors are connected in series, in parallel, or in series-parallel.

[0010] In an optional embodiment, the differential voltage circuit includes: a filter circuit and a voltage conversion chip, wherein the first end of the filter circuit is connected to the second end of the step-down circuit and the input end of the voltage conversion chip, and the second end of the filter circuit is connected to the output end of the main power supply circuit of the server load and the input end of the voltage conversion chip; the output end of the voltage conversion chip is connected to the first end of the voltage conditioning circuit; the filter circuit filters the voltage at the server load end and transmits it to the voltage conversion chip, and the voltage conversion chip converts the voltage at the server load end into a differential voltage signal.

[0011] In an optional embodiment, the voltage conditioning circuit includes: a differential amplifier circuit and a voltage follower circuit, wherein the first end of the differential amplifier circuit is connected to the second end of the voltage conditioning circuit, and the second end of the differential amplifier circuit is connected to the first end of the voltage follower circuit; the second end of the voltage follower circuit is connected to the first end of the control circuit; the differential amplifier circuit performs differential amplification on the differential voltage signal, and the voltage follower circuit performs voltage following on the amplified differential voltage signal and then feeds it back to the control circuit.

[0012] In an optional embodiment, the differential amplifier circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, and a first operational amplifier, wherein the first end of the first resistor is connected to the second end of the voltage conditioning circuit, and the second end of the first resistor is connected to the first end of the second resistor; the second end of the second resistor is respectively connected to the first end of the first capacitor, the first end of the third resistor, and the inverting input end of the first operational amplifier; the first end of the fourth resistor is connected to the second end of the voltage conditioning circuit, and the second end of the fourth resistor is connected to the first end of the fifth resistor; the second end of the fifth resistor is respectively connected to the first end of the sixth resistor, the first end of the second capacitor, and the non-inverting input end of the first operational amplifier; the second end of the sixth resistor is connected to the second end of the second capacitor and then grounded; the positive power supply end of the first operational amplifier is connected to the power supply voltage, the positive power supply end of the first operational amplifier is also connected to the first end of the third capacitor, and the negative power supply end of the first operational amplifier is grounded; the second end of the third capacitor is grounded.

[0013] In an optional embodiment, the voltage follower circuit includes: a seventh resistor, an eighth resistor, a fourth capacitor, a fifth capacitor and a second operational amplifier, wherein the first end of the seventh resistor is connected to the second end of the differential amplifier circuit, and the second end of the seventh resistor is respectively connected to the first end of the fourth capacitor and the in-phase input end of the second operational amplifier; the inverting input end of the second operational amplifier is connected to its output end and the first end of the eighth resistor; the second end of the eighth resistor is respectively connected to the first end of the fifth capacitor and the first end of the control circuit; the second end of the fourth capacitor is grounded; and the second end of the fifth capacitor is grounded.

[0014] In an optional embodiment, the switching circuit includes: a driving circuit and a controllable switching device, wherein a first end of the driving circuit is connected to a second end of the control circuit, and the second end of the driving circuit is connected to a control end of the controllable switching device; the first end of the controllable switching device is connected to an input end of a main power supply circuit of a server load, and the second end of the controllable switching device is connected to a first end of a current limiting circuit; when the power board is powered on, the control circuit sends a turn-on signal to the driving circuit, and the driving circuit drives the controllable switching device to turn on; when the voltage at the server load end reaches a preset voltage, the control circuit sends a turn-off signal to the driving circuit, and the driving circuit drives the controllable switching device to turn off.

[0015] In the present invention, when the controllable switch device is turned on, the voltage drop is small, the temperature is low, and the power board efficiency is high.

[0016] In an optional implementation, the current limiting circuit includes: at least one current limiting resistor.

[0017] In a second aspect, the present invention provides a server power board, comprising the server power board current slow-start device of the first aspect and any optional implementation manner thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of a power board supplying power to a server load in the related art;

[0020] Figure 2 is a composition diagram of a current slow-start device for a server power board according to an embodiment of the present invention;

[0021] Figure 3 is a composition diagram of another server power board current slow-start device according to an embodiment of the present invention;

[0022] Figure 4 is a specific circuit structure diagram of a voltage conversion circuit according to an embodiment of the present invention;

[0023] Figure 5 is a specific circuit structure diagram of a voltage conditioning circuit according to an embodiment of the present invention;

[0024] Figure 6 It is a composition diagram of another server power board current slow-start device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] like Figure 1 As shown, in the related art, the server power supply unit (Power Supply Unit, PSU for short) is one of the important components in the server system, which is mainly responsible for providing stable and reliable power support for the server during its operation. In the server system, the most critical components are core components such as CPU and memory, which need to be supplied with stable current to ensure the normal and efficient operation of the server. Therefore, the PSU of the server plays a very important role in the stability, reliability, performance and other aspects of the server. When the P12V power board input voltage is powered on, due to the large number of inductive loads such as back-end loads and capacitors, the instantaneous current of the impact current will be large, which is easy to cause uneven current of the memory (i.e., EFUSE) and the overcurrent protection threshold of EFUSE, exceeding the current threshold specified by the server, seriously affecting the stable operation of the server.

[0030] Therefore, in order to solve the above problems, a server power board current slow-start device is provided in this embodiment, such as Figure 2 As shown, it includes: a voltage monitor, a control circuit, a switch circuit and a current limiting circuit.

[0031] like Figure 2 As shown, the first end of the voltage monitor is connected to the output end of the main power supply circuit of the server load, and the second end of the voltage monitor is connected to the first end of the control circuit. The input end of the main power supply circuit of the server load is connected to the output end of the power board, and the output end of the main power supply circuit of the server load is connected to the load.

[0032] Specifically, the voltage monitor has the function of monitoring the server load voltage, and can condition the load voltage and feed it back to the control circuit, where the conditioning content is not limited to voltage reduction, differential amplification, filtering, voltage matching, voltage following, etc., to obtain a voltage signal that can be recognized and processed by the control circuit.

[0033] like Figure 2As shown, the second end of the control circuit is connected to the control end of the switch circuit.

[0034] Specifically, the control circuit can determine whether the voltage of the server load reaches a preset voltage threshold, and control the on-off state of the switch circuit according to the judgment result to ensure that the server power board directly supplies power to the load through the main power supply circuit, or supplies power to the load after current limiting by the current limiting circuit.

[0035] Optionally, the control circuit can be an analog circuit or a digital circuit. When the control circuit is an analog circuit, the control circuit can be built-in by setting a comparator, which can compare the voltage of the server load with the reference voltage and output a high-level signal or a low-level signal to control the on-off of the switch circuit; when the control circuit is a digital circuit, the control circuit can be a CPLD control module in the server. The CPLD chip controls the state of the loop, responds promptly, and has simple logic. The CPLD control module converts the voltage of the server into a voltage digital signal, and compares the voltage digital signal with a preset voltage threshold and outputs a control signal to control the on-off of the switch circuit.

[0036] like Figure 2 As shown, the first end of the switch circuit is connected to the input end of the main power supply circuit of the server load, and the second end of the switch circuit is connected to the first end of the current limiting circuit. The second end of the current limiting circuit is connected to the output end of the main power supply circuit of the server load.

[0037] Specifically, when the switch circuit is turned on and the main power supply circuit is disconnected, the output voltage of the server power board is transmitted to the current limiting circuit through the switch circuit. The current limiting circuit limits the voltage and then transmits it to the server load to avoid current overshoot; when the switch circuit is turned off and the main power supply circuit is turned on, the output voltage of the server power board is transmitted to the server load through the main power supply circuit.

[0038] Optionally, the switch circuit has a built-in controllable switch, and the controllable switch may be an IGBT, a MOSFET, etc., which is not limited here.

[0039] Optionally, the current limiting circuit may be formed by linear components, such as at least one current limiting resistor, the resistance of which is determined according to a preset voltage threshold and the capacity of a nonlinear load at the back end of the memory.

[0040] Specifically, refer to Figure 2 Two power supply paths are set for the server power board, and different power supply conditions are involved after the server power board is turned on, as follows:

[0041] (1) When the power board is powered on, the control circuit sends a conduction signal to the switch circuit, and the voltage monitor monitors the voltage at the server load end and feeds it back to the control circuit.

[0042] When the power board is powered on, in order to avoid current overshoot, the main power supply circuit is not started, and the control circuit controls the switch circuit to turn on, so that the power board supplies power to the load through the auxiliary circuit composed of the switch circuit and the current limiting circuit.

[0043] Optionally, the control circuit may not control the switch circuit to be turned on all the time, but may control the switch circuit to be turned on or off periodically, for example, controlling the switch circuit to be turned on every 5 us.

[0044] (2) When the voltage at the server load end reaches a preset voltage, the control circuit sends a shutdown signal to the switch circuit.

[0045] When the power board supplies power to the server load through the auxiliary circuit, the voltage monitor monitors the voltage of the server load in real time, and the control circuit determines whether the voltage of the server load reaches the preset voltage threshold. When the preset voltage threshold is reached, it means that the voltage of the server nonlinear load has reached the preset voltage threshold. At this time, the power board can directly supply power to the server load, so the control circuit controls the switch circuit to shut down.

[0046] Optionally, when the power board supplies power to the server load through the main power supply circuit, the voltage monitor can also monitor the voltage of the server load in real time and feed back to the control circuit. When the voltage of the server load exceeds the limit, the control circuit can turn on the switch circuit again to limit the current of the power board voltage. Alternatively, when the power board voltage is too high and may cause the server load to burn out, the control circuit can directly cut off the main power supply circuit to disconnect the power board from the server load.

[0047] In some optional embodiments, such as Figure 3 As shown, the voltage monitor includes: a voltage conversion circuit and a voltage conditioning circuit.

[0048] like Figure 3 As shown, the first end of the voltage conversion circuit is connected to the output end of the main power supply circuit of the server load, the second end of the voltage conversion circuit is connected to the first end of the voltage conditioning circuit; the second end of the voltage conditioning circuit is connected to the first end of the control circuit.

[0049] Specifically, when the power board is powered on, the control circuit sends a conduction signal to the switching circuit, the voltage conversion circuit monitors the voltage at the server load end, and the voltage conversion circuit steps down and converts the voltage at the server load end to obtain a differential voltage signal; the voltage conditioning circuit differentially amplifies and voltage-follows the differential voltage signal and then feeds it back to the control circuit.

[0050] Specifically, in order to match the control parameters of the control circuit, it is necessary to add a voltage conversion circuit and a voltage conditioning circuit before the control circuit, wherein the voltage conversion circuit is mainly used to obtain a differential signal function, and the voltage conditioning circuit is mainly used to amplify and follow the voltage of the differential signal. Since the use of differential signals can have a strong suppression ability for common-mode input signals but has little effect on differential-mode signals, differential signals are used as the input stage and intermediate stage of integrated operations to suppress the impact of changes in external conditions on the circuit, such as temperature noise.

[0051] In some optional implementations, the voltage conversion circuit includes: a step-down circuit and a differential voltage circuit.

[0052] Specifically, the first end of the step-down circuit is connected to the output end of the main power supply circuit of the server load, and the second end of the step-down circuit is connected to the first end of the differential voltage circuit. The step-down circuit is added before the differential voltage circuit to step down the voltage of the server load.

[0053] Optionally, the step-down circuit includes: a plurality of step-down resistors, wherein the plurality of step-down resistors are connected in series, in parallel, or in series-parallel. Figure 4 As shown, the voltage-dropping resistor includes four resistors, namely R9 to R12, which are connected in series, and the resistance values ​​of the four resistors are set as required.

[0054] Specifically, the second end of the differential voltage circuit is connected to the output end of the main power supply circuit of the server load, and the third end of the differential voltage circuit is connected to the first end of the voltage conditioning circuit.

[0055] Specifically, when the power board is powered on, the control circuit sends a conduction signal to the switch circuit, the step-down circuit steps down the voltage at the server load end, and the differential voltage circuit converts the stepped-down voltage at the server load end to obtain a differential voltage signal.

[0056] In some optional embodiments, the differential voltage circuit includes: a filter circuit and a voltage conversion chip, wherein the first end of the filter circuit is connected to the second end of the step-down circuit and the input end of the voltage conversion chip, and the second end of the filter circuit is connected to the output end of the main power supply circuit of the server load and the input end of the voltage conversion chip; the output end of the voltage conversion chip is connected to the first end of the voltage conditioning circuit; the filter circuit filters the voltage at the server load end and transmits it to the voltage conversion chip, and the voltage conversion chip converts the voltage at the server load end into a differential voltage signal.

[0057] Optionally, in order to further prevent signal interference such as noise, a filter circuit is provided before the voltage conversion chip. The filter circuit may be formed by connecting a capacitor and a resistor in parallel, or a filter circuit of other structures may be used, which is not limited here. Figure 4 , JX1 is connected to the output end of the main power supply circuit, and the filter circuit is composed of resistors R13, R14 and capacitor C6 connected in parallel.

[0058] Optionally, the voltage conversion chip has a built-in differential circuit, which can convert the voltage of the server load into a differential signal to resist interference from the common-mode input signal.

[0059] Optionally, refer to Figure 4 The voltage conversion chip is U1, and its model may be HCPL7840. Pin 1 of HCPL7840 is connected to VDD, and connected to ground after being connected in series with capacitor C7. Pin 2 is connected to a step-down resistor (R12). Pins 3 and 4 are short-circuited, pin 5 is grounded, and pins 6 and 7 are connected to the differential amplifier circuit in the voltage conditioning circuit.

[0060] In some optional implementations, the voltage conditioning circuit includes: a differential amplifier circuit and a voltage follower circuit.

[0061] Specifically, the first end of the differential amplifier circuit is connected to the second end of the voltage conditioning circuit, and the second end of the differential amplifier circuit is connected to the first end of the voltage follower circuit; the second end of the voltage follower circuit is connected to the first end of the control circuit; the differential amplifier circuit performs differential amplification on the differential voltage signal, and the voltage follower circuit performs voltage following on the amplified differential voltage signal and then feeds it back to the control circuit.

[0062] Specifically, the differential amplifier circuit uses the symmetry of circuit parameters and negative feedback to effectively stabilize the static operating point, and is characterized by amplifying differential mode signals and suppressing common mode signals. It is widely used in the input stage of direct coupling circuits and measurement circuits. Differential amplifier circuit: According to the input and output mode, it is divided into four types: dual-ended input and dual-ended output, dual-ended input and single-ended output, single-ended input and dual-ended output, and single-ended input and single-ended output.

[0063] Optionally, the differential amplifier circuit of this embodiment mainly adopts a dual-end input and single-end output structure, such as Figure 5 As shown, the differential amplifier circuit specifically includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a first operational amplifier A1.

[0064] Figure 5In the embodiment, the first end of the first resistor R1 is connected to the second end of the voltage conditioning circuit, and the second end of the first resistor R1 is connected to the first end of the second resistor R2; the second end of the second resistor R2 is respectively connected to the first end of the first capacitor C1, the first end of the third resistor R3, and the inverting input end of the first operational amplifier A1; the first end of the fourth resistor R4 is connected to the second end of the voltage conditioning circuit, and the second end of the fourth resistor R4 is connected to the first end of the fifth resistor R5; the second end of the fifth resistor R5 is respectively connected to the first end of the sixth resistor R6, the first end of the second capacitor C2, and the non-inverting input end of the first operational amplifier A1; the second end of the sixth resistor R6 is connected to the second end of the second capacitor C2 and then grounded; the positive power supply end of the first operational amplifier A1 is connected to the power supply voltage, the positive power supply end of the first operational amplifier A1 is also connected to the first end of the third capacitor C3, and the negative power supply end of the first operational amplifier A1 is grounded; the second end of the third capacitor C3 is grounded.

[0065] Specifically, Figure 5 In the figure, ADC4 is connected to the control circuit, the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 step down the two signals of the differential voltage signal and input them into the first operational amplifier A1, the sixth resistor R6 and the second capacitor C2 form an RC filter circuit, and the first operational amplifier amplifies the differential voltage signal and transmits it to the voltage follower circuit.

[0066] Specifically, the present embodiment sets a voltage follower circuit, which has the characteristics of high input impedance and low output impedance. When the input impedance is very high, it is equivalent to an open circuit for the previous stage circuit. When the output impedance is very low, the output impedance is low, which is equivalent to a small internal resistance of the power supply. When the output current of the power supply changes, the voltage difference on the internal resistance changes little. It is equivalent to a constant voltage source for the subsequent stage circuit, that is, the output voltage is not affected by the impedance of the subsequent stage circuit. A circuit that is equivalent to an open circuit for the previous stage circuit and whose output voltage is not affected by the impedance of the subsequent stage certainly has an isolation effect, even if the previous and subsequent stage circuits do not affect each other.

[0067] Alternatively, if Figure 5 As shown, the voltage follower circuit includes: a seventh resistor R7, an eighth resistor R8, a fourth capacitor C4, a fifth capacitor C5 and a second operational amplifier A1, wherein the first end of the seventh resistor R7 is connected to the second end of the differential amplifier circuit, and the second end of the seventh resistor R7 is respectively connected to the first end of the fourth capacitor C4 and the in-phase input end of the second operational amplifier A1; the inverting input end of the second operational amplifier A1 is connected to its output end and the first end of the eighth resistor R8; the second end of the eighth resistor R8 is respectively connected to the first end of the fifth capacitor C5 and the first end of the control circuit; the second end of the fourth capacitor C4 is grounded; and the second end of the fifth capacitor C5 is grounded.

[0068] Figure 5In FIG. 1 , the second operational amplifier A1 is a unity gain buffer, which generates an output signal with an amplitude equal to the input signal. Since the input signal is applied to the non-inverting input terminal, no phase inversion occurs. Therefore, the second operational amplifier A1 is a non-inverting buffer with a good following function.

[0069] In some optional embodiments, such as Figure 6 As shown, the switch circuit includes: a drive circuit and a controllable switch device.

[0070] like Figure 6 As shown, the first end of the drive circuit is connected to the second end of the control circuit, and the second end of the drive circuit is connected to the control end of the controllable switch device; the first end of the controllable switch device is connected to the input end of the main power supply circuit of the server load, and the second end of the controllable switch device is connected to the first end of the current limiting circuit.

[0071] Optionally, the controllable switch device may be an IGBT, a MOSFET, etc., which is not limited here. The drive circuit may convert the control signal output by the control circuit into a control voltage that can drive the controllable switch device.

[0072] Specifically, when the power board is powered on, the control circuit sends a turn-on signal to the drive circuit, and the drive circuit drives the controllable switch device to turn on; when the voltage at the server load end reaches a preset voltage, the control circuit sends a turn-off signal to the drive circuit, and the drive circuit drives the controllable switch device to turn off.

[0073] In this embodiment, a server power board is provided, comprising the server power board current slow-start device of the above embodiment and any optional implementation manner thereof.

[0074] Specifically, the server power supply may include a rectifier circuit, a DC-DC circuit, etc. that can convert AC power into DC power, or convert DC power into another amplitude DC power. The power supply is connected to a slow-start device at the back stage, so that when power is turned on, when the switch circuit is turned on and the main power supply circuit is disconnected, the output voltage of the server power board is transmitted to the current limiting circuit through the switch circuit, and the current limiting circuit limits the voltage and then transmits it to the server load to avoid current overshoot; when the switch circuit is turned off and the main power supply circuit is turned on, the output voltage of the server power board is transmitted to the server load through the main power supply circuit, so that the current slowly passes through the auxiliary circuit, thereby suppressing the problem of excessive impact current during the power-on process.

[0075] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A current slow-start device for a server power board, characterized in that: include: Voltage monitor, control circuit, switch circuit and current limiting circuit, wherein: The first end of the voltage monitor is connected to the output end of the main power supply circuit of the server load, and the second end of the voltage monitor is connected to the first end of the control circuit; The second end of the control circuit is connected to the control end of the switch circuit; The first end of the switch circuit is connected to the input end of the main power supply circuit of the server load, and the second end of the switch circuit is connected to the first end of the current limiting circuit; The second end of the current limiting circuit is connected to the output end of the main power supply circuit of the server load; The input end of the main power supply circuit of the server load is connected to the output end of the power board, and the output end of the main power supply circuit of the server load is connected to the load; When the power board is powered on, the control circuit sends a conduction signal to the switch circuit, and the voltage monitor monitors the voltage at the server load end and feeds back to the control circuit; when the voltage at the server load end reaches a preset voltage, the control circuit sends a shutdown signal to the switch circuit.

2. The server power board current slow-start device according to claim 1, characterized in that: The voltage monitor includes: a voltage conversion circuit and a voltage conditioning circuit, wherein: The first end of the voltage conversion circuit is connected to the output end of the main power supply circuit of the server load, and the second end of the voltage conversion circuit is connected to the first end of the voltage conditioning circuit; The second end of the voltage conditioning circuit is connected to the first end of the control circuit; When the power board is powered on, the control circuit sends a conduction signal to the switch circuit, and the voltage conversion circuit monitors the voltage at the server load end. The voltage conversion circuit steps down and converts the voltage at the server load end to obtain a differential voltage signal; the voltage conditioning circuit differentially amplifies and voltage-follows the differential voltage signal and then feeds it back to the control circuit.

3. The server power board current slow-start device according to claim 2, characterized in that: The voltage conversion circuit includes: a step-down circuit and a differential voltage circuit, wherein: The first end of the step-down circuit is connected to the output end of the main power supply circuit of the server load, and the second end of the step-down circuit is connected to the first end of the differential voltage circuit; The second end of the differential voltage circuit is connected to the output end of the main power supply circuit of the server load, and the third end of the differential voltage circuit is connected to the first end of the voltage conditioning circuit; When the power board is powered on, the control circuit sends a conduction signal to the switch circuit, the step-down circuit steps down the voltage at the server load end, and the differential voltage circuit performs voltage conversion on the stepped-down voltage at the server load end to obtain a differential voltage signal.

4. The server power board current slow-start device according to claim 3, characterized in that: The step-down circuit includes: a plurality of step-down resistors, wherein the plurality of step-down resistors are connected in series, in parallel, or in series-parallel form.

5. The server power board current slow-start device according to claim 3, characterized in that: The differential voltage circuit includes: a filter circuit and a voltage conversion chip, wherein: The first end of the filter circuit is connected to the second end of the step-down circuit and the input end of the voltage conversion chip, and the second end of the filter circuit is connected to the output end of the main power supply circuit of the server load and the input end of the voltage conversion chip; The output end of the voltage conversion chip is connected to the first end of the voltage conditioning circuit; The filter circuit filters the voltage at the server load end and transmits the filtered voltage to the voltage conversion chip. The voltage conversion chip converts the voltage at the server load end into a differential voltage signal.

6. The server power board current slow-start device according to claim 2, characterized in that: The voltage conditioning circuit includes: a differential amplifier circuit and a voltage follower circuit, wherein: The first end of the differential amplifier circuit is connected to the second end of the voltage conditioning circuit, and the second end of the differential amplifier circuit is connected to the first end of the voltage follower circuit; The second end of the voltage follower circuit is connected to the first end of the control circuit; The differential amplifier circuit differentially amplifies the differential voltage signal, and the voltage follower circuit voltage follows the amplified differential voltage signal and then feeds it back to the control circuit.

7. The server power board current slow-start device according to claim 6, characterized in that: The differential amplifier circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, and a first operational amplifier, wherein: The first end of the first resistor is connected to the second end of the voltage conditioning circuit, and the second end of the first resistor is connected to the first end of the second resistor; The second end of the second resistor is respectively connected to the first end of the first capacitor, the first end of the third resistor, and the inverting input end of the first operational amplifier; The first end of the fourth resistor is connected to the second end of the voltage conditioning circuit, and the second end of the fourth resistor is connected to the first end of the fifth resistor; The second end of the fifth resistor is respectively connected to the first end of the sixth resistor, the first end of the second capacitor, and the non-inverting input end of the first operational amplifier; The second end of the sixth resistor is connected to the second end of the second capacitor and then grounded; The positive power supply terminal of the first operational amplifier is connected to the power supply voltage, the positive power supply terminal of the first operational amplifier is also connected to the first end of the third capacitor, and the negative power supply terminal of the first operational amplifier is grounded; A second terminal of the third capacitor is grounded.

8. The server power board current slow-start device according to claim 6, characterized in that: The voltage follower circuit includes: a seventh resistor, an eighth resistor, a fourth capacitor, a fifth capacitor and a second operational amplifier, wherein: The first end of the seventh resistor is connected to the second end of the differential amplifier circuit, and the second end of the seventh resistor is connected to the first end of the fourth capacitor and the non-inverting input end of the second operational amplifier respectively; The inverting input terminal of the second operational amplifier is connected to its output terminal and the first terminal of the eighth resistor; The second end of the eighth resistor is connected to the first end of the fifth capacitor and the first end of the control circuit respectively; The second end of the fourth capacitor is grounded; A second terminal of the fifth capacitor is grounded.

9. The server power board current slow-start device according to claim 1, characterized in that: The switch circuit comprises: a drive circuit and a controllable switch device, wherein: The first end of the driving circuit is connected to the second end of the control circuit, and the second end of the driving circuit is connected to the control end of the controllable switch device; The first end of the controllable switch device is connected to the input end of the main power supply circuit of the server load, and the second end of the controllable switch device is connected to the first end of the current limiting circuit; When the power board is powered on, the control circuit sends a conduction signal to the drive circuit, and the drive circuit drives the controllable switch device to conduct; When the voltage at the server load end reaches a preset voltage, the control circuit sends a shutdown signal to the drive circuit, and the drive circuit drives the controllable switch device to turn off.

10. A server power board, characterized in that: The invention comprises the current slow-start device of the server power board as described in any one of claims 1 to 9.

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