Power gain control circuit and method and server

Abstract

The invention provides a power supply gain control circuit and method and a server, and belongs to the technical field of power supply control. The circuit comprises a first control module, a gain adjusting module and an output loop. The first end of the first control module is used for inputting a power supply detection signal, and the second end of the first control module is connected with the first end of the gain adjustment module; a second end of the gain adjusting module is used for inputting working voltage, a third end of the gain adjusting module is connected with a first input end of the output loop, and a fourth end of the gain adjusting module is connected with a first power supply end of the output loop; the first input end of the output loop is also used for inputting sampling voltage, the second input end of the output loop is grounded, and the output end of the output loop is used for outputting a target control signal. According to the invention, the phase margin and the dynamic current sharing response speed of the power supply loop can be flexibly adjusted by adjusting the magnitude of the feedback resistor according to the actual working condition.

Description

Technical Field

[0001] The present application relates to the field of power control technology, and in particular to a power gain control circuit, method and server. Background Art

[0002] With the rapid development of network technology, technicians have set up more and more servers. Generally, it is necessary to balance the power supply of these servers to ensure stable operation of the servers.

[0003] In the related art, in the power supply system of some servers, some current sharing feedback loops including operational amplifiers can be set up, and by detecting the voltage of the current sharing bus and the voltage of the power supply output, and calculating the error between the two, the reference output voltage is determined and active current sharing is achieved. In addition, in some schemes, a resistor with a smaller resistance value is used as the feedback resistor of the operational amplifier.

[0004] However, this solution causes a -90° phase lag due to the existence of the main pole and the slave pole of the operational amplifier. When the load changes suddenly or other phase delays occur, the phase margin may be too small, resulting in unstable output. Although the use of a small-value feedback resistor can increase the phase margin of the loop, it will reduce the response speed of dynamic current sharing. Summary of the invention

[0005] The purpose of the present application is to provide a power supply gain control circuit, method and server, which can flexibly adjust the phase margin and dynamic current sharing response speed of the power supply loop by adjusting the size of the feedback resistor according to the actual working conditions.

[0006] The embodiment of the present application is implemented as follows:

[0007] According to a first aspect of an embodiment of the present application, there is provided a power supply gain control circuit, the circuit comprising: a first control module, a gain adjustment module, and an output loop;

[0008] The first end of the first control module is used to input a power detection signal, and the second end of the first control module is connected to the first end of the gain adjustment module; the power detection signal is used to indicate the working state of the power supply, and the first control module is used to output a level signal to the gain adjustment module under the action of the power detection signal;

[0009] The second end of the gain adjustment module is used to input the working voltage, the third end of the gain adjustment module is connected to the first input end of the output loop, and the fourth end of the gain adjustment module is connected to the first power supply end of the output loop; the gain adjustment module is used to operate under the action of the level signal to switch the feedback resistor of the gain adjustment module connected to the output loop;

[0010] The first input terminal of the output loop is also used to input a sampling voltage, the second input terminal of the output loop is grounded, and the output terminal of the output loop is used to output a target control signal; the target control signal is used to adjust the output voltage of the power supply; the output loop is used to adjust the output gain based on the feedback resistor to generate the target control signal.

[0011] Optionally, the gain adjustment module includes: an isolation unit and a feedback resistance switching unit;

[0012] The first end of the isolation unit is connected to the second end of the first control module, and the second end of the isolation unit is connected to the first end of the feedback resistance switching unit; the isolation unit is used to output a start-up voltage to the feedback resistance switching unit under the action of the level signal;

[0013] The second end of the feedback resistance switching unit is used to input the working voltage, the third end of the feedback resistance switching unit is connected to the first input end of the output loop, and the fourth end of the feedback resistance switching unit is connected to the first power supply end of the output loop; the feedback resistance switching unit is used to be turned on under the action of the starting voltage to switch the feedback resistor connected to the output loop.

[0014] Optionally, the feedback resistance switching unit includes: a transistor, a first resistor, and a second resistor;

[0015] The base of the transistor is connected to the second end of the isolation unit, the emitter of the transistor is connected to the first end of the first resistor, and the collector of the transistor is used to input the working voltage; the transistor is used to be turned on under the action of the start signal;

[0016] The second end of the first resistor is connected to the first end of the second resistor and the first input end of the output loop respectively; the first resistor is used to be connected to the output loop in parallel with the second resistor when the transistor is turned on;

[0017] The second end of the second resistor is respectively connected to the collector of the transistor and the first power supply end of the output loop; the second resistor is used to be connected to the output loop in parallel with the second resistor when the transistor is turned on, and to be connected to the output loop alone when the transistor is turned off, so as to serve as a feedback resistor of the output loop.

[0018] Optionally, the feedback resistance switching unit further includes: a feedforward capacitor;

[0019] The feed-forward capacitor is connected between the first end of the second resistor and the first input end of the output loop; or,

[0020] The feed-forward capacitor is connected between the second end of the second resistor and the first power supply end of the output loop.

[0021] Optionally, the output loop includes at least an operational amplifier;

[0022] The first input terminal of the operational amplifier is connected to the third terminal of the gain adjustment module, the second input terminal of the operational amplifier is grounded, the first power supply terminal of the operational amplifier is connected to the fourth terminal of the gain adjustment module, and the output terminal of the operational amplifier is used to output the amplified voltage;

[0023] The first input terminal of the operational amplifier is also used to input a sampling voltage;

[0024] The operational amplifier changes the output gain based on the resistance value of the connected feedback resistor, so as to adjust the target control signal output by the output loop based on the amplified voltage.

[0025] Optionally, the first control module includes: a timer;

[0026] The first end of the timer is used to input a power detection signal, and the second end of the timer is connected to the first end of the gain adjustment module;

[0027] The timer is used to output the level signal under the action of the power detection signal, and stop outputting the level signal to the gain adjustment module after delaying for a preset time.

[0028] Optionally, the circuit further includes a second control module;

[0029] The first end of the second control module is connected to the third end of the first control module;

[0030] The second control module is used to collect power parameters of the power supply, and control the first control module to output the level signal according to the power parameters; the power parameters at least include output voltage and input voltage.

[0031] Optionally, the second control module is further configured to detect a current working state of the power supply and a signal output state of the first control module, determine a feedback resistor currently connected to the output loop by the gain adjustment module according to the signal output state, and determine whether the gain of the output loop needs to be controlled according to the resistance value of the feedback resistor;

[0032] The second control module is further configured to calculate a target gain value when it is determined that the gain of the output loop needs to be controlled, and adjust the output of the output loop based on the target gain value.

[0033] A second aspect of the embodiments of the present application provides a power gain control method, which is applied to any of the power gain control circuits provided in the first aspect above, and the method includes:

[0034] Get power detection signal;

[0035] Outputting a level signal to a gain adjustment module according to the power detection signal;

[0036] Controlling the gain adjustment module to adjust the feedback resistor connected to the output loop according to the level signal;

[0037] The output loop is controlled to adjust the output gain based on the resistance value of the feedback resistor, and a target control signal is generated; the target control signal is used to adjust the output voltage of the power supply.

[0038] According to a third aspect of an embodiment of the present application, a server is provided, comprising: at least two power supply modules, a current sharing bus, and at least two power supply gain control circuits as described in any one of claims 1 to 9 above.

[0039] The beneficial effects of the embodiments of the present application include:

[0040] The embodiment of the present application provides a power gain control circuit, which is provided with a first control module, a gain adjustment module, and an output loop, specifically inputting a power detection signal into the first end of the first control module, the second end of the first control module is connected to the first end of the gain adjustment module, the second end of the gain adjustment module is used to input a working voltage, the third end of the gain adjustment module is connected to the first input end of the output loop, and the fourth end of the gain adjustment module is connected to the first power supply end of the output loop. The first input end of the output loop is also used to input a sampling voltage, the second input end of the output loop is grounded, and the target control signal is output through the output end of the output loop.

[0041] Since the power detection signal can indicate whether the power supply connected to the power gain control circuit is switching between power on and power off, the first control module can output the level signal when the power supply is switching between power on and power off to control the action of the gain adjustment module, thereby reducing the resistance value of the feedback resistor connected to the output loop. The output loop adjusts the output gain based on the reduction of the feedback resistor, and at the same time, the phase margin of the circuit and / or the power supply can be increased. In this way, the dynamic instability of the power supply loop caused by the power on and power off switching of the power supply can be resisted or reduced, thereby ensuring the stability of the output voltage of the power supply.

[0042] Furthermore, when the power supply resumes stable power supply, the power supply detection signal stops inputting, the first control module stops outputting the level signal, and the gain adjustment module increases the resistance of the feedback resistor connected to the output loop. The output loop adjusts the output gain based on the increase of the feedback resistor, and at the same time can reduce the phase margin of the circuit and / or power supply and improve the dynamic current sharing response speed. In this way, when the power supply is normally supplied, the dynamic response speed of the power supply loop and the current sharing capability of the power supply can be improved to ensure that the current sharing adjustment can be performed quickly and timely when there is a sudden load change.

[0043] It can be seen that the power supply gain control circuit provided in the embodiment of the present application can flexibly adjust the phase margin and dynamic current sharing response speed of the power supply loop by adjusting the size of the feedback resistor according to the actual working conditions of the circuit and / or power supply.

[0044] In this way, it is possible to provide a larger phase margin when a phase delay occurs and to have a higher dynamic response speed during normal operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] It should be understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 A schematic diagram of the structure of a first power supply gain control circuit provided in an embodiment of the present application;

[0047] Figure 2 A schematic diagram of the structure of a second power supply gain control circuit provided in an embodiment of the present application;

[0048] Figure 3 A schematic diagram of the structure of a third power supply gain control circuit provided in an embodiment of the present application;

[0049] Figure 4 A schematic diagram of the structure of a fourth power supply gain control circuit provided in an embodiment of the present application;

[0050] Figure 5 A schematic diagram of the structure of a fifth power supply gain control circuit provided in an embodiment of the present application;

[0051] Figure 6 A schematic diagram of the structure of a sixth power supply gain control circuit provided in an embodiment of the present application;

[0052] Figure 7 A flow chart of a power gain control method provided in an embodiment of the present application;

[0053] Figure 8A schematic diagram of the structure of a server provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable when appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0056] In the related art, in the power supply system of some servers, some current sharing feedback loops including operational amplifiers can be set up, and by detecting the voltage of the current sharing bus and the voltage of the power supply output, and calculating the error between the two, the reference output voltage is determined and active current sharing is achieved. In addition, in some schemes, a resistor with a smaller resistance value is used as the feedback resistor of the operational amplifier.

[0057] However, this solution causes a -90° phase lag due to the existence of the main pole and the slave pole of the operational amplifier. When the load changes suddenly or other phase delays occur, the phase margin may be too small, resulting in unstable output. Although the use of a small-value feedback resistor can increase the phase margin of the loop, it will reduce the response speed of dynamic current sharing.

[0058] Therefore, how to provide a power current balancing solution that can provide a larger phase margin when the load changes suddenly or a phase delay occurs and has a higher dynamic response speed during normal operation is a technical problem that needs to be solved urgently.

[0059] To this end, the embodiment of the present application provides a power gain control circuit, by setting a first control module, a gain adjustment module, and an output loop; and the first end of the first control module is used to input a power detection signal, and the second end of the first control module is connected to the first end of the gain adjustment module; the second end of the gain adjustment module is used to input an operating voltage, the third end of the gain adjustment module is connected to the first input end of the output loop, and the fourth end of the gain adjustment module is connected to the first power supply end of the output loop; the first input end of the output loop is also used to input a sampling voltage, the second input end of the output loop is grounded, and the output end of the output loop is used to output a target control signal. In this way, the phase margin and dynamic current sharing response speed of the power loop can be flexibly adjusted by adjusting the size of the feedback resistor according to the actual working conditions.

[0060] The present application embodiment is described by taking the power gain control circuit used in a server as an example, but it does not mean that the present application embodiment can only be used in a server to perform power gain control.

[0061] It is understandable that power current balancing generally refers to a technology that, when there are multiple power supplies in a device, each power supply needs to output equal power as evenly as possible to reduce the load of each power supply.

[0062] For example, if the server is provided with two power supplies that output a total of 2000 W of working power, the two power supplies can each output 1000 W of power. When one power supply fails, the other power supply can provide 2000 W of power to the server alone.

[0063] In addition, when the two power supplies are powered on, they will generally be connected in a certain order to power the server. At this time, the load of the power supply will also change, or a certain phase delay will occur. At this time, certain control is required to increase the phase margin. This embodiment of the application does not limit this.

[0064] The power supply gain control circuit provided in the embodiment of the present application is explained in detail below.

[0065] Figure 1 This is a schematic diagram of the structure of a power gain control circuit provided by the present application. The circuit can be applied to any device powered by multiple power supplies. The device can be the aforementioned server, and the present application embodiment does not limit this. Figure 1 An embodiment of the present application provides a power supply gain control circuit 100 , and the circuit 100 includes: a first control module 101 , a gain adjustment module 102 , and an output loop 103 .

[0066] The first end of the first control module 101 is used to input a power detection signal, and the second end of the first control module 101 is connected to the first end of the gain adjustment module 102 .

[0067] The second end of the gain adjustment module 102 is used to input the working voltage, the third end of the gain adjustment module 102 is connected to the first input end of the output loop 103 , and the fourth end of the gain adjustment module 102 is connected to the first power supply end of the output loop 103 .

[0068] The first input terminal of the output loop 103 is also used to input a sampling voltage, the second input terminal of the output loop 103 is grounded, and the output terminal of the output loop 103 is used to output a target control signal.

[0069] Optionally, the power detection signal is used to indicate the working state of the power supply. Generally, the power detection signal is generated at the moment when the power supply is powered on or off, that is, the power detection signal can be specifically used to indicate that the power supply is powered on or off.

[0070] The power detection signal may be output to the first control module 101 by any possible component, and this embodiment of the present application does not limit this.

[0071] Optionally, the first control module 101 may be a component with certain timing and control capabilities. The first control module 101 may be configured to output a level signal to the gain adjustment module 102 under the action of the power detection signal.

[0072] Furthermore, the first control module 101 may output the level signal immediately upon receiving the power detection signal, or may wait for a period of time after receiving the power detection signal before outputting the level signal, which is not limited in this embodiment of the present application.

[0073] Optionally, the level signal may be a high level or a low level, and may be specifically set according to the specific structure of the gain adjustment module 102, as long as the level signal can control the action of the gain adjustment module 102. This embodiment of the application does not limit this.

[0074] Optionally, the gain adjustment module 102 is configured to operate under the action of the level signal to switch the feedback resistor of the gain adjustment module 102 connected to the output loop 103 .

[0075] The operating voltage may be a voltage used to enable the gain adjustment module 102 to operate normally, such as Figure 1 The voltage V1 shown may generally be 5V or a voltage of any other voltage level, and may be adjusted according to actual needs.

[0076] Generally, the output gain of the output loop 103 has a certain positive correlation with the feedback resistor connected to the output loop 103 .

[0077] Exemplarily, when the level signal is not input to the gain adjustment module 102, the feedback resistance of the gain adjustment module 102 connected to the output loop 103 is large, which can ensure that the output loop 103 has a large gain and can provide a faster dynamic current sharing response speed for the circuit 100 and / or the entire power supply loop.

[0078] When the level signal is input to the gain adjustment module 102, the feedback resistance of the gain adjustment module 102 connected to the output loop 103 is small, which can ensure that the output loop 103 has a small gain and can provide a large phase margin for the circuit 100 and / or the entire power supply loop.

[0079] That is, the output loop 103 can be specifically used to adjust the output gain based on the feedback resistor to generate the target control signal. Moreover, the feedback resistor connected to the output loop 103 when the gain adjustment module 102 acts based on the level signal is greater than the feedback resistor connected to the output loop 103 when the gain adjustment module 102 does not act based on the level signal.

[0080] For example, the sampled voltage (eg, Figure 1 The voltage V2) shown may be the output voltage of a power supply connected to the circuit 100, so that a feedback loop may be formed for the power supply to dynamically adjust the output voltage of the power supply.

[0081] Specifically, the target control signal can be used to adjust the output voltage of the power supply, and the target control signal can be a pulse width modulation (PWM) signal. Specifically, the conduction frequency of the switch tube related to the power supply can be changed by adjusting the duty cycle or frequency of the target control signal, thereby increasing or decreasing the voltage output by the power supply. The specific control method can be adjusted according to the actual output circuit of the power supply, and the embodiments of the present application are not limited to this.

[0082] In addition, the output loop 103 can be any possible closed-loop control system. For example, the output loop 103 can collect any possible power parameters such as the output voltage and output current of the power supply, and perform certain calculations based on the corresponding proportional-integral control algorithm to output the target control signal. The specific circuit structure of the output loop 103 is not limited in the embodiment of the present application.

[0083] It is worth noting that, at the moment of powering on or off, the power loop may experience certain oscillations, which may lead to dynamic instability in the entire power loop. At this time, power supply abnormality may occur. When the power supply is supplying power normally, if there is a load change or other power supplies are powered off or on, the power supply may need to re-balance the current. At this time, it is necessary to ensure that the power loop has a faster dynamic current balancing response speed.

[0084] It is worth noting that the working principle of the circuit 100 provided in the embodiment of the present application is specifically described as follows:

[0085] When the power supply connected to the circuit 100 is not powered on or remains powered off, the first control module 101 does not input the power detection signal, and thus does not output the level signal, so the gain adjustment module 102 does not operate, and the output loop 103 does not input the sampling voltage. At this time, the circuit 100 is in a dormant state.

[0086] When the power supply connected to the circuit 100 remains powered on and has no abnormal fluctuations, the first control module 101 will not input the power detection signal, and will not output the level signal, so the gain adjustment module 102 does not operate. At this time, the output loop 103 generally has the sampled voltage input, and only a large feedback resistor is connected to the output loop 103. In this way, when the power supply is normally input, a faster dynamic response speed can be provided for the circuit 100 and / or the power supply.

[0087] When the power supply connected to the circuit 100 switches from the power-off state to the power-on state, or from the power-on state to the power-off state, the first control module 101 inputs the power detection signal, and the first control module 101 can output the level signal to the gain adjustment module 102. At this time, the gain adjustment module 102 operates and connects the smaller feedback resistor to the output loop 103. The output loop 103 can reduce the output gain based on the smaller feedback resistor, thereby increasing the phase margin. In this way, when the power supply is switched on and off, the dynamic instability in the power supply loop can be resisted or reduced, thereby ensuring the stability of the output voltage of the power supply.

[0088] After the power supply connected to the circuit 100 completes the switching of power on and power off, the power supply detection signal stops being input to the first control module 101. At this time, the first control module 101 stops outputting the level signal to the gain adjustment module 102. At this time, the gain adjustment module 102 restores the default state and connects the larger feedback resistor to the output loop 103. The output loop 103 can increase the output gain based on the larger feedback resistor, thereby reducing the phase margin and improving the dynamic current sharing response speed. In this way, when the power supply completes the switching of power on and power off, the dynamic response speed of the power supply loop and the current sharing capability of the power supply can be improved to ensure that the current sharing adjustment can be performed quickly and timely when there is a sudden load change.

[0089] In the embodiment of the present application, by setting the first control module 101, the gain adjustment module 102, and the output loop 103, the power detection signal is specifically input to the first end of the first control module 101, the second end of the first control module 101 is connected to the first end of the gain adjustment module 102, the second end of the gain adjustment module 102 is used to input the working voltage, the third end of the gain adjustment module 102 is connected to the first input end of the output loop 103, and the fourth end of the gain adjustment module 102 is connected to the first power supply end of the output loop 103. The first input end of the output loop 103 is also used to input the sampling voltage, the second input end of the output loop 103 is grounded, and the target control signal is output through the output end of the output loop 103.

[0090] Among them, since the power detection signal can indicate whether the power connected to the power gain control circuit 100 is switching between power on and power off, the first control module 101 can output the level signal when the power is switching between power on and power off to control the gain adjustment module 102 to operate, thereby reducing the resistance of the feedback resistor connected to the output loop 103. The output loop 103 adjusts the output gain based on the reduction of the feedback resistor, and at the same time, the phase margin of the circuit 100 and / or the power supply can be increased. In this way, the dynamic instability of the power loop caused by the power on and power off switching of the power supply can be resisted or reduced, thereby ensuring the stability of the output voltage of the power supply.

[0091] Furthermore, when the power supply resumes stable power supply, the power supply detection signal stops inputting, the first control module 101 stops outputting the level signal, and the gain adjustment module 102 increases the resistance of the feedback resistor connected to the output loop 103. The output loop 103 adjusts the output gain based on the increase of the feedback resistor, and at the same time can reduce the phase margin of the circuit 100 and / or the power supply and improve the dynamic current sharing response speed. In this way, when the power supply is normally supplied, the dynamic response speed of the power supply loop and the current sharing capability of the power supply can be improved to ensure that the current sharing adjustment can be performed quickly and timely when there is a sudden load change.

[0092] In addition, the output loop 103 can also adjust the target control signal output by the output loop 103 according to the changes of the feedback resistance and the sampling voltage, thereby changing the output voltage of the power supply to achieve the effect of dynamic current sharing.

[0093] It can be seen that the power supply gain control circuit provided in the embodiment of the present application can flexibly adjust the phase margin and dynamic current sharing response speed of the power supply loop by adjusting the size of the feedback resistor according to the actual working conditions of the circuit and / or power supply.

[0094] In this way, it is possible to provide a larger phase margin when a phase delay occurs and to have a higher dynamic response speed during normal operation.

[0095] For a possible implementation, see Figure 2 The gain adjustment module 102 includes: an isolation unit 1021 and a feedback resistance switching unit 1022.

[0096] The first end of the isolation unit 1021 is connected to the second end of the first control module 101, and the second end of the isolation unit 1021 is connected to the first end of the feedback resistance switching unit 1022; the isolation unit 1021 is used to output a starting voltage to the feedback resistance switching unit 1022 under the action of the level signal.

[0097] The second end of the feedback resistance switching unit 1022 is used to input the working voltage, the third end of the feedback resistance switching unit 1022 is connected to the first input end of the output loop 103, and the fourth end of the feedback resistance switching unit 1022 is connected to the first power supply end of the output loop 103. The feedback resistance switching unit 1022 is used to be turned on under the action of the starting voltage to switch the feedback resistance connected to the output loop 103.

[0098] Optionally, the isolation unit 1021 may be any device capable of achieving high and low voltage isolation. For example, the isolation element 1021 may be any possible device such as an optocoupler isolator, a digital isolator, a magnetic coupler isolator, etc., which is not limited in the embodiments of the present application.

[0099] Optionally, the startup voltage may be a voltage signal generated by the isolation unit 1021 at the secondary side of the isolation unit 1021 based on the level signal. The startup voltage is used to specifically control the feedback resistance switching unit 1022 to be turned on.

[0100] For example, see Figure 3 The isolation unit 1021 may include an optical coupler isolator U. For specific connection relationship, see Figure 3 As shown, the embodiments of the present application are not described in detail here.

[0101] For another example, the feedback resistor switching unit 1022 may include at least one switch device and at least one resistor. In this case, the switch device may be turned on under the action of the start voltage to change the connection mode of the resistor connected to the output loop 103, thereby achieving the purpose of switching the feedback resistor connected to the output loop 103.

[0102] It is worth noting that, generally, when there is no input of the level signal, no current flows through the primary side and the secondary side of the isolation unit 1021, and at this time, the feedback resistance switching unit 1022 is turned off, and the feedback resistance connected to the output loop 103 is relatively large. When the level signal is input to the primary side of the isolation unit 1021, the secondary side of the isolation unit 1021 outputs a start-up voltage to the feedback resistance switching unit 1022, and at this time, the feedback resistance switching unit 1022 is turned on under the action of the start-up voltage and the working voltage, and the feedback resistance connected to the output loop 103 is relatively small.

[0103] In this way, not only can the feedback resistor switching unit 1022 be controlled to be turned on or off to achieve the purpose of controlling the resistance value of the feedback resistor connected to the output loop 103, but the isolation unit 1021 can also be used to achieve high and low voltage isolation between the first control module 101 and the feedback resistor switching unit 1022 and the output loop 103, thereby preventing high voltage from breaking down or damaging low voltage devices.

[0104] In a possible implementation, see Figure 3 The feedback resistance switching unit 1022 includes: a transistor Q, a first resistor R1, and a second resistor R2.

[0105] The base of the transistor Q is connected to the second end of the isolation unit 1021, the emitter of the transistor Q is connected to the first end of the first resistor R1, and the collector of the transistor Q is used to input the working voltage; the transistor Q is used to be turned on under the action of the start signal.

[0106] The second end of the first resistor R1 is connected to the first end of the second resistor R2 and the first input end of the output loop 103 respectively; the first resistor R1 is used to be connected to the output loop 103 in parallel with the second resistor R2 when the transistor Q is turned on.

[0107] The second end of the second resistor R2 is connected to the collector of the transistor Q and the first power supply end of the output loop 103 respectively; the second resistor R2 is used to be connected to the output loop 103 in parallel with the second resistor R2 when the transistor Q is turned on, and to be connected to the output loop 103 alone when the transistor Q is turned off, so as to serve as a feedback resistor of the output loop 103.

[0108] Optionally, the transistor Q may be a PNP transistor.

[0109] Optionally, the resistance values ​​of the first resistor R1 and the second resistor R2 can be set according to actual needs. For example, the resistance value of the second resistor R2 can be 10KΩ, and the resistance of the second resistor R2 and the first resistor R1 in parallel is 1KΩ, then the resistance value of the first resistor R1 can be determined according to the resistance value of the second resistor R2. This embodiment of the application is not limited to this.

[0110] It is worth noting that when the startup voltage is not input, the collector of the transistor Q has the working voltage, at which time the transistor Q remains in the off state, the first resistor R1 is disconnected, and only the second resistor R2 can be connected to the output loop 103, that is, the resistance of the feedback resistor connected to the output loop 103 is the resistance of the second resistor R2. When the startup voltage is input, the collector of the transistor Q has the working voltage, at which time the conduction condition of the transistor Q is met, the transistor Q is turned on, the first resistor R1 can also form a path, and the first resistor R1 and the second resistor R2 are connected in parallel to the output loop 103, that is, the resistance of the feedback resistor connected to the output loop 103 is the resistance of the first resistor R1 and the second resistor R2 in parallel.

[0111] Since the resistance after parallel connection is reduced, it can be ensured that when the power detection signal and / or the start-up voltage are input, a feedback resistor with a smaller resistance value can be connected to the output loop 103 to provide a larger phase margin. In addition, it can be ensured that when there is no power detection signal and / or the start-up voltage input, a feedback resistor with a larger resistance value can be connected to the output loop 103 to provide a faster dynamic current sharing response speed.

[0112] In a possible implementation, the feedback resistance switching unit 1022 further includes: a feedforward capacitor.

[0113] The feed-forward capacitor is connected between the first end of the second resistor R2 and the first input end of the output loop 103; or,

[0114] The feed-forward capacitor is connected between the second end of the second resistor R2 and the first power supply end of the output loop 103 .

[0115] Optionally, the feedforward capacitor may be a capacitor of any capacitance value, which may be specifically selected according to parameters of other components, and the embodiment of the present application does not limit this.

[0116] It is worth noting that, by setting the feedforward capacitor, the dynamic characteristics of the circuit can be appropriately improved, thereby improving the practicality of the circuit 100.

[0117] For a possible implementation, see Figure 4 , the output loop 103 at least includes an operational amplifier A.

[0118] The first input terminal of the operational amplifier A is connected to the third terminal of the gain adjustment module 102, the second input terminal of the operational amplifier A is grounded, the first power supply terminal of the operational amplifier A is connected to the fourth terminal of the gain adjustment module 102, and the output terminal of the operational amplifier A is used to output the amplified voltage.

[0119] The first input terminal of the operational amplifier A is also used to input a sampling voltage.

[0120] The operational amplifier A changes the output gain based on the resistance value of the connected feedback resistor, so as to adjust the target control signal output by the output loop 103 based on the amplified voltage.

[0121] Optionally, the operational amplifier A may be any possible operational amplifier. The amplified voltage may be generated by amplifying the sampled voltage based on the resistance value of the feedback resistor.

[0122] In one possible manner, the operational amplifier A is generally only a device for voltage control in the output loop 103. The output loop 103 may also include various other devices for sampling, calculation, and control, which are not limited in the present embodiment. Figure 4 , the output loop 103 may also include other units, Figure 4 The example shown is only an example and does not mean that other units in the output loop 103 can only Figure 4 Connect to operational amplifier A in the manner shown.

[0123] Exemplarily, the other units may include a current sampling device, a proportional control link, an integral control link, and any other device that may be used for voltage gain control, which is not limited in the embodiments of the present application.

[0124] Generally speaking, within a reasonable range, the larger the feedback resistance connected to operational amplifier A, the greater the gain of operational amplifier A; the smaller the feedback resistance connected to operational amplifier A, the smaller the gain of operational amplifier A.

[0125] It is worth noting that by reducing the feedback resistance connected to the operational amplifier A, the gain of the operational amplifier A can be reduced, thereby improving the phase margin of the circuit 100 or the entire power loop, so that the phase margin can be increased when the power is turned on and off, thereby stabilizing the circuit. In addition, by increasing the feedback resistance connected to the operational amplifier A, the gain of the operational amplifier A can be increased, thereby reducing the phase margin of the circuit 100 or the entire power loop and improving the dynamic current sharing response speed.

[0126] For a possible implementation, see Figure 5 , the first control module 101 includes: a timer T.

[0127] A first end of the timer T is used to input a power detection signal, and a second end of the timer T is connected to a first end of the gain adjustment module 102 .

[0128] The timer T is used to output the level signal under the action of the power detection signal, and stop outputting the level signal to the gain adjustment module 102 after delaying for a preset time.

[0129] Optionally, the timer T may be a delay timer. The preset delay time of the timer T may be set according to actual needs, for example, the preset delay time may be set to any possible delay time such as 1S or 2S.

[0130] Furthermore, since the working conditions when the power is powered on and when the power is powered off are different, different preset time lengths may be set respectively.

[0131] Exemplarily, it is assumed that the power detection signal input to the timer T is different when the power is powered on and powered off, and the process from power on to stable output of the power supply takes about 1500ms, and the process from power off to complete power off of the power supply takes about 100ms. When the timer T determines that the power supply is powered on, considering the time of output of the power detection signal and the preparation time of other corresponding modules, the timer T can stop outputting the level signal after a delay of 2s. In this way, the preset duration of 2s can cover the entire startup process of the power supply, and it can be ensured that the power supply has been fully started when the timer T stops outputting the level signal.

[0132] When the timer T determines that the power supply is powered off, the time when the power supply detection signal is output and the preparation time of other corresponding modules are taken into consideration, and the power supply detection signal can change rapidly after the power supply is powered off, so the timer T can stop outputting the level signal after a short delay (such as 1 second). In this way, it can be ensured that the power supply is completely powered off when the timer T stops outputting the level signal.

[0133] It is worth noting that by setting the timer T to delay the stop of outputting the level signal, it can ensure that the power supply is fully powered on or fully powered off when the output of the level signal is stopped, that is, the entire process of powering on or off the power supply can be covered during the process of outputting the level signal, thereby improving the stability of the circuit 100.

[0134] In a possible implementation, see Figure 5 , the second input terminal of the operational amplifier A is grounded through the first capacitor C1, and the first terminal of the timer T is grounded through the second capacitor C2.

[0135] The first capacitor C1 and the second capacitor C2 can be used as filter capacitors respectively to improve the stability of the circuit 200 .

[0136] In a possible implementation, see Figure 5 , the circuit also includes a second control module 104.

[0137] The first end of the second control module 104 is connected to the third end of the first control module 101.

[0138] The second control module 104 is used to collect the power parameters of the power supply, and control the first control module 101 to output the level signal according to the power parameters.

[0139] Optionally, the second control module 104 may be any element having processing, computing and controlling functions, such as a digital signal processor (DSP) or any other possible processor, which is not limited in the embodiment of the present application.

[0140] Optionally, the electric energy parameter includes at least the output voltage and the input voltage, and may also include any possible parameters such as the current sharing bus voltage, the output current or the input current, etc. The parameters may be adjusted according to actual needs.

[0141] In this case, the second control module 104 can determine whether the power supply has a sudden load change, power-off, power-on, or current-sharing condition through the power energy parameter. If so, the second control module 104 can directly control the first control module 101 to output the level signal or stop outputting the level signal to change the phase margin and dynamic response speed of the circuit 100 and / or the power loop.

[0142] In addition, the second control module 104 can also collect the voltage of the current-sharing bus and compare the voltage of the current-sharing bus with the voltage output by the power supply so as to perform single integral control.

[0143] In one possible manner, the second control module 104 is specifically used to detect the current working state of the power supply and the signal output state of the first control module 101, determine the feedback resistance currently connected to the output loop 103 by the gain adjustment module 102 according to the signal output state, and determine whether the gain of the output loop 103 needs to be controlled according to the resistance value of the feedback resistance.

[0144] The second control module 104 is further configured to calculate a target gain value when it is determined that the gain of the output loop needs to be controlled, and adjust the output of the output loop 103 based on the target gain value.

[0145] Optionally, the current working state of the power supply may include: the power supply is switched from power-on to power-off, the power supply is switched from power-off to power-on, the power supply is powered on normally, and the like.

[0146] The signal output state may indicate whether the first control module 101 currently outputs the level signal.

[0147] Specifically, the second control module 104 determines the feedback resistance of the gain adjustment module 102 currently connected to the output loop 103 according to the signal output state, which specifically means: if the second control module 104 detects that the first control module 101 is not currently outputting the level signal, it can be determined that the gain adjustment module 102 is not in operation, and the feedback resistance is relatively large. If it is detected that the first control module 101 is currently outputting the level signal, it can be determined that the gain adjustment module 102 is in operation, and the feedback resistance is relatively small.

[0148] For example, when the second control module 104 determines whether the gain of the output loop needs to be controlled according to the resistance value of the feedback resistor, the judgment may be made in combination with other information such as the current working state of the power supply. For example, if the resistance value of the current feedback resistor is relatively large, and the power supply is currently switching from power-on to power-off (or from power-off to power-on), the second control module 104 may determine that the gain of the output loop 103 needs to be controlled.

[0149] In addition, the second control module 104 can also actively control the timer T to output or stop outputting the level signal. Specifically, the timer T can be controlled to extend or shorten the duration of outputting the level signal. This embodiment of the application does not limit this.

[0150] In one possible manner, the second control module 104 may calculate the target gain value in any possible manner, and may specifically select a corresponding calculation method and corresponding parameters for calculation according to an actual control method, which is not limited in this embodiment of the present application.

[0151] Another possible method is to provide a possible current gain control circuit 100 in an embodiment of the present application. Figure 6 .

[0152] like Figure 6 As shown, the current gain control circuit 100 may include a first control module 101, a gain adjustment module 102, a second control module 104, a current sharing bus voltage acquisition device J1, a power supply detection device J2, and a power supply output adjustment module Y. The gain adjustment module 102 specifically includes an isolation unit 1021 and a feedback resistance switching unit 1022. The specific connection relationship between the components is as follows: Figure 6 As shown, no further elaboration is given here.

[0153] Among them, the current-sharing bus voltage acquisition device J1 is used to detect the voltage of the current-sharing bus and send it to the second control module 104. The power supply detection device J2 is used to detect the power-on and power-off conditions of the power supply and output the above-mentioned power supply detection model. The power supply output adjustment module Y is used to adjust the output of the power supply based on the target gain value under the action of the second control module 104.

[0154] In a possible manner, the power output regulating module Y may be a component for regulating the power supply in the output loop 103, which is not limited in the embodiment of the present application.

[0155] In addition, the second control module 104 can also detect the size of the feedback resistor connected to the gain adjustment module 201, and / or detect the switch state of the transistor in the gain adjustment module 201, which can be adjusted according to actual needs. This embodiment of the application is not limited to this.

[0156] The power gain control method, device, etc. provided in the present application are described below. The power gain control method can be applied to the above-mentioned power gain control circuit 100. Its specific implementation process and technical effects refer to the relevant description in the corresponding embodiment of the above-mentioned power gain control circuit 100, which will not be described in detail below.

[0157] Figure 7 1 is a flow chart of a power gain control method provided in an embodiment of the present application. The power gain control method can be applied to the power gain control circuit 100 described above, and can be specifically executed by the first control module 101 and / or the second control module 104 described above. Figure 7 , the method comprising:

[0158] Step 2001: Obtain a power detection signal.

[0159] Step 2002: Output a level signal to a gain adjustment module according to the power detection signal.

[0160] Optionally, the gain adjustment module may be the gain adjustment module 102 mentioned above.

[0161] Step 2003: Control the gain adjustment module to adjust the feedback resistance connected to the output loop according to the level signal.

[0162] Optionally, the output loop may be the output loop 103 described above.

[0163] Optionally, the gain adjustment module may specifically reduce the feedback resistance connected to the output loop when the level signal is received, and increase the feedback resistance connected to the output loop when the level signal is not received.

[0164] Step 2004: Control the output loop to adjust the output gain based on the resistance value of the feedback resistor and generate a target control signal.

[0165] Optionally, the target control signal is used to adjust the output voltage of the power supply, thereby achieving power supply adjustment or current sharing control.

[0166] It is worth noting that, since the power detection signal can indicate whether the power supply connected to the power gain control circuit is switching between power on and power off, the first control module can output the level signal when the power supply is switching between power on and power off to control the action of the gain adjustment module, thereby reducing the resistance of the feedback resistor connected to the output loop. The output loop adjusts the output gain based on the reduction of the feedback resistor, and at the same time, the phase margin of the circuit and / or the power supply can be increased. In this way, the dynamic instability of the power supply loop caused by the power on and power off switching of the power supply can be resisted or reduced, thereby ensuring the stability of the output voltage of the power supply.

[0167] Furthermore, when the power supply resumes stable power supply, the power supply detection signal stops inputting, the first control module stops outputting the level signal, and the gain adjustment module increases the resistance of the feedback resistor connected to the output loop. The output loop adjusts the output gain based on the increase of the feedback resistor, and at the same time can reduce the phase margin of the circuit and / or power supply and improve the dynamic current sharing response speed. In this way, when the power supply is normally supplied, the dynamic response speed of the power supply loop and the current sharing capability of the power supply can be improved to ensure that the current sharing adjustment can be performed quickly and timely when there is a sudden load change.

[0168] It can be seen that the power supply gain control circuit provided in the embodiment of the present application can flexibly adjust the phase margin and dynamic current sharing response speed of the power supply loop by adjusting the size of the feedback resistor according to the actual working conditions of the circuit and / or power supply.

[0169] It is understandable that the power gain control method provided in the embodiment of the present application may also include any other possible steps to correspondingly implement any function that the above-mentioned power gain control circuit 100 can implement, and the embodiment of the present application does not limit this.

[0170] In addition, an embodiment of the present application further provides a power gain control device, the device comprising:

[0171] The acquisition module is used to acquire the power detection signal through the first control module.

[0172] The output module is used to output a level signal to the gain adjustment module according to the power detection signal through the first control module.

[0173] The feedback resistance adjustment module is used to adjust the feedback resistance connected to the output loop according to the level signal through the gain adjustment module.

[0174] The adjustment generation module is used to adjust the output gain based on the resistance value of the feedback resistor through the output loop and generate a target control signal; the target control signal is used to adjust the output voltage of the power supply.

[0175] The above-mentioned device is used to execute the method provided by the aforementioned embodiment, and its implementation principle and technical effect are similar, which will not be repeated here.

[0176] The above modules may be one or more integrated circuits configured to implement the above methods, such as one or more application specific integrated circuits (ASICs), or one or more microprocessors, or one or more field programmable gate arrays (FPGAs). For another example, when a module is implemented in the form of a processing element scheduling program code, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0177] An embodiment of the present application further provides a server, which includes at least: at least two power supply modules, a current sharing bus, and a power supply gain control circuit provided in any of the above embodiments.

[0178] Figure 8 Schematic diagram of the structure of a server provided in an embodiment of the present application. Figure 8 The server 300 specifically includes a power load F, a first power module B1, a second power module B2, two power gain control circuits 100, and a current sharing bus L. The specific connection relationship is as follows Figure 8 As shown, the embodiments of the present application are not described in detail here.

[0179] In addition, the server may further include a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the computer program, the steps in any of the above method embodiments are implemented.

[0180] An embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments can be implemented.

[0181] Optionally, the present application also provides a program product, such as a computer-readable storage medium, including a program, which is used to execute any of the above-mentioned power gain control method embodiments when executed by a processor.

[0182] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0183] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0184] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0185] The integrated unit implemented in the form of the above-mentioned software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to perform some steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (English: Read-Only Memory, abbreviated: ROM), random access memory (English: Random Access Memory, abbreviated: RAM), disk or optical disk and other media that can store program codes.

[0186] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A power supply gain control circuit, characterized in that: The circuit comprises: a first control module, a gain adjustment module, and an output loop; The first end of the first control module is used to input a power detection signal, and the second end of the first control module is connected to the first end of the gain adjustment module; the power detection signal is used to indicate the working state of the power supply, and the first control module is used to output a level signal to the gain adjustment module under the action of the power detection signal; The second end of the gain adjustment module is used to input the working voltage, the third end of the gain adjustment module is connected to the first input end of the output loop, and the fourth end of the gain adjustment module is connected to the first power supply end of the output loop; the gain adjustment module is used to operate under the action of the level signal to switch the feedback resistor of the gain adjustment module connected to the output loop; The first input terminal of the output loop is also used to input a sampling voltage, the second input terminal of the output loop is grounded, and the output terminal of the output loop is used to output a target control signal; the target control signal is used to adjust the output voltage of the power supply; the output loop is used to adjust the output gain based on the feedback resistor to generate the target control signal.

2. The power supply gain control circuit according to claim 1, characterized in that: The gain adjustment module includes: an isolation unit and a feedback resistance switching unit; The first end of the isolation unit is connected to the second end of the first control module, and the second end of the isolation unit is connected to the first end of the feedback resistance switching unit; the isolation unit is used to output a start-up voltage to the feedback resistance switching unit under the action of the level signal; The second end of the feedback resistance switching unit is used to input the working voltage, the third end of the feedback resistance switching unit is connected to the first input end of the output loop, and the fourth end of the feedback resistance switching unit is connected to the first power supply end of the output loop; the feedback resistance switching unit is used to be turned on under the action of the starting voltage to switch the feedback resistor connected to the output loop.

3. The power gain control circuit according to claim 2, characterized in that: The feedback resistance switching unit includes: a transistor, a first resistor, and a second resistor; The base of the transistor is connected to the second end of the isolation unit, the emitter of the transistor is connected to the first end of the first resistor, and the collector of the transistor is used to input the working voltage; the transistor is used to be turned on under the action of the start signal; The second end of the first resistor is connected to the first end of the second resistor and the first input end of the output loop respectively; the first resistor is used to be connected to the output loop in parallel with the second resistor when the transistor is turned on; The second end of the second resistor is respectively connected to the collector of the transistor and the first power supply end of the output loop; the second resistor is used to be connected to the output loop in parallel with the second resistor when the transistor is turned on, and to be connected to the output loop alone when the transistor is turned off, so as to serve as a feedback resistor of the output loop.

4. The power gain control circuit according to claim 3, characterized in that: The feedback resistance switching unit further includes: a feedforward capacitor; The feed-forward capacitor is connected between the first end of the second resistor and the first input end of the output loop; or, The feed-forward capacitor is connected between the second end of the second resistor and the first power supply end of the output loop.

5. The power gain control circuit according to claim 1, characterized in that: The output loop includes at least an operational amplifier; The first input terminal of the operational amplifier is connected to the third terminal of the gain adjustment module, the second input terminal of the operational amplifier is grounded, the first power supply terminal of the operational amplifier is connected to the fourth terminal of the gain adjustment module, and the output terminal of the operational amplifier is used to output the amplified voltage; The first input terminal of the operational amplifier is also used to input a sampling voltage; The operational amplifier changes the output gain based on the resistance value of the connected feedback resistor, so as to adjust the target control signal output by the output loop based on the amplified voltage.

6. The power gain control circuit according to claim 1, characterized in that: The first control module includes: a timer; The first end of the timer is used to input a power detection signal, and the second end of the timer is connected to the first end of the gain adjustment module; The timer is used to output the level signal under the action of the power detection signal, and stop outputting the level signal to the gain adjustment module after a preset delay.

7. The power gain control circuit according to claim 1, characterized in that: The circuit also includes a second control module; The first end of the second control module is connected to the third end of the first control module; The second control module is used to collect power parameters of the power supply, and control the first control module to output the level signal according to the power parameters; the power parameters at least include output voltage and input voltage.

8. The power gain control circuit according to claim 7, characterized in that: The second control module is further specifically used to detect the current working state of the power supply and the signal output state of the first control module, determine the feedback resistor currently connected to the output loop by the gain adjustment module according to the signal output state, and determine whether the gain of the output loop needs to be controlled according to the resistance value of the feedback resistor; The second control module is further configured to calculate a target gain value when it is determined that the gain of the output loop needs to be controlled, and adjust the output of the output loop based on the target gain value.

9. A power supply gain control method, characterized in that: Applied to the power supply gain control circuit according to any one of claims 1 to 8, the method comprising: Get power detection signal; Outputting a level signal to a gain adjustment module according to the power detection signal; Controlling the gain adjustment module to adjust the feedback resistor connected to the output loop according to the level signal; The output loop is controlled to adjust the output gain based on the resistance value of the feedback resistor, and a target control signal is generated; the target control signal is used to adjust the output voltage of the power supply.

10. A server, characterized in that: The server comprises: at least two power modules, a current sharing bus, and at least two power gain control circuits as described in any one of claims 1 to 8 above.

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