A hot backup control circuit, a storage system and a server of a BBU module

Abstract

The application discloses a kind of hot backup control circuit of BBU module, storage system and server, it is related to the field of standby power, the connection between the four of PSU module, BBU module, voltage reduction module, load is controlled by first control module and second control module: when PSU module works normally, PSU module is powered by second control module for load, simultaneously, it is powered by first control module to voltage reduction module, without consuming the power of BBU module, reduce the charging frequency of BBU module, prolong the service life of BBU module;And BBU module and voltage reduction module are in normal open state, when fault occurs inside PSU module or between PSU module and load, first control module controls BBU module and voltage reduction module connection, second control module controls voltage reduction module and load connection, BBU module is powered by voltage reduction module for load, without consuming time waiting, improve the reliability of storage system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of backup power supply, in particular to a hot backup control circuit of a BBU module, a storage system and a server. BACKGROUND

[0002] With the development of China's electronic industry, more and more electronic devices have been widely used. In the storage device, a PSU (Power Supply Unit) module and a BBU (Battery Backup Unit) module are usually equipped. The PSU module is composed of multiple PSU units, the input end is connected with a power supply, and the output end is connected with a load responsible for storing data, for supplying power to the load; the BBU module includes a plurality of charging batteries in series and parallel connection, for providing power supply to the load when the PSU module has a problem, ensuring that the load stores data completely, and avoiding the problem of data loss when power is turned on again.

[0003] In the existing scheme, the power supply modes of the PSU module and the BBU module include a cold backup power supply mode and a hot backup power supply mode.

[0004] In the cold backup power supply mode, when the PSU module supplies power normally, the BBU module does not work, and when the PSU module supplies power abnormally, the BBU module starts to supply power again; in the process of switching from the PSU module power supply to the BBU module power supply, the load is supplied by the capacitor inside the PSU module, but when a short circuit fault occurs inside the PSU module or between the PSU module and the load, the PSU module cannot provide enough power for the process of switching to the BBU module, thereby causing a data loss scenario.

[0005] In the hot backup power supply mode, the PSU module and the BBU module both work, and the control circuit selects the power supply unit currently supplying power to the load according to the size of the output voltage of the PSU module and the BBU module; but even if the power supply of the load is provided by the PSU module, the BBU module will still have power loss because it is in standby state, and the power supply will always charge the BBU module to ensure that the BBU module is in full power state at any time, so that the BBU module repeatedly enters the charging and full power state. After 300 times of full charging and discharging, the capacity will be reduced to 80% of the original capacity, and the subsequent backup power supply demand cannot be met, which aggravates the loss of the charging battery and reduces the service life of the battery. If it is always in a hot backup state, the service life of the BBU is about 1.5-2 years. SUMMARY

[0006] The application aims to provide a hot backup control circuit of a BBU module, a storage system and a server, when a PSU module works normally, the PSU module supplies power to a load through a second control module and supplies power to a step-down module through a first control module, without consuming the power of the BBU module, reducing the charging frequency of the BBU module, prolonging the service life of the BBU module, reducing the use cost of customers and the maintenance cost of the company, and the step-down module is in a normal open state, when a fault occurs in the PSU module or between the PSU module and the load, the first control module controls the BBU module to be connected with the step-down module, the second control module controls the step-down module to be connected with the load, and the BBU module supplies power to the load through the step-down module, without consuming time for waiting, and the reliability of the storage system is improved.

[0007] To solve the above technical problems, the application provides a hot backup control circuit of a BBU module, which comprises a PSU module, a BBU module and a step-down module, and further comprises:

[0008] a first control module, a first end of which is connected with an output end of the PSU module and a first end of a second control module, a second end of which is connected with an output end of the BBU module, and a third end of which is connected with an input end of the step-down module, for connecting the first end with the third end when the PSU module works normally, so that the PSU module supplies power to the step-down module, and connecting the second end with the third end when the PSU module fails, so that the BBU module supplies power to the step-down module;

[0009] the second control module, a second end of which is connected with an output end of the step-down module, and a third end of which is connected with a load, for connecting the first end with the third end when the PSU module works normally, so that the PSU module supplies power to the load, and connecting the second end with the third end when the PSU module fails, so that the BBU module supplies power to the load through the step-down module.

[0010] Preferably, the first control module comprises:

[0011] a step-up module, an input end of which is connected with an output end of the PSU module, and an output end of which is connected with a first end of a first controllable switch module, for increasing the output voltage of the PSU module to a first preset voltage when the PSU module works normally, the first preset voltage being greater than the output voltage of the BBU module;

[0012] The first controllable switch module has a second end connected with a second end of a second controllable switch module and an output end of the voltage reduction module, and is used for closing when a voltage of the first end of the first controllable switch module is greater than a voltage of the second end of the first controllable switch module, so as to make the PSU module supply power to the voltage reduction module; otherwise, the first controllable switch module is opened.

[0013] The second controllable switch module has a first end connected with an output end of the BBU module, and is used for closing when a voltage of the first end of the second controllable switch module is greater than a voltage of the second end of the second controllable switch module, so as to make the BBU module supply power to the voltage reduction module; otherwise, the second controllable switch module is opened.

[0014] Preferably, the first controllable switch module and the second controllable switch module each comprise:

[0015] A first controllable semiconductor device has a first end corresponding to the first end of the corresponding controllable switch module, a second end corresponding to the second end of the corresponding controllable switch module, and a control end connected with an output end of the first control chip.

[0016] The first control chip has a first end connected with the first end of the first controllable semiconductor device and a second end connected with the second end of the first controllable semiconductor device, and is used for controlling the first controllable semiconductor device to close when a voltage of the first end of the first controllable semiconductor device is greater than a voltage of the second end of the first controllable semiconductor device, and otherwise, controlling the first controllable semiconductor device to open.

[0017] Preferably, the first controllable semiconductor device is an NMOS tube, a source of the NMOS tube is the first end of the first controllable semiconductor device, a drain of the NMOS tube is the second end of the first controllable semiconductor device, and a gate of the NMOS tube is the control end of the first controllable semiconductor device.

[0018] Preferably, the second control module comprises:

[0019] A third controllable switch module has a first end connected with an output end of the PSU module and a first end of the first control module respectively, and a second end connected with an input end of the load and a second end of a fourth controllable switch module respectively, and is used for closing when a voltage of the first end of the third controllable switch module is greater than a voltage of the second end of the third controllable switch module, so as to make the PSU module supply power to the load; otherwise, the third controllable switch module is opened.

[0020] A fourth controllable switch module, a first end of which is connected with the output end of the voltage reduction module, for when the voltage of the first end of the fourth controllable switch module is greater than the voltage of the second end of the fourth controllable switch module, the fourth controllable switch module is closed to make the BBU module supply power to the load through the voltage reduction module; otherwise, the fourth controllable switch module is opened.

[0021] Preferably, the third controllable switch module and the fourth controllable switch module each comprise:

[0022] A second controllable semiconductor device, a first end of which is the first end of the corresponding controllable switch module, a second end of which is the second end of the corresponding controllable switch module, and a control end of which is connected with the output end of the second control chip;

[0023] The second control chip, a first end of which is connected with the first end of the second controllable semiconductor device, and a second end of which is connected with the second end of the second controllable semiconductor device, for when the voltage of the first end of the second controllable semiconductor device is greater than the voltage of the second end of the second controllable semiconductor device, controlling the second controllable semiconductor device to be closed, otherwise, controlling the second controllable semiconductor device to be opened.

[0024] Preferably, the second controllable semiconductor device is an NMOS tube, a source of the NMOS tube is the first end of the second controllable semiconductor device, a drain of the NMOS tube is the second end of the second controllable semiconductor device, and a gate of the NMOS tube is the control end of the second controllable semiconductor device.

[0025] Preferably, the application further comprises:

[0026] A charging module, an input end of which is connected with the output end of the PSU module, and an output end of which is connected with the input end of the BBU module, for when the PSU module is working normally, adjusting the output voltage and output current of the PSU to a preset charging voltage and charging current to charge the BBU module.

[0027] The application further provides a storage system comprising a hard disk and a hot standby control circuit of a BBU module as described above, the hot standby control circuit being connected with the hard disk.

[0028] The application further provides a server comprising a storage system as described above.

[0029] The application provides a hot backup control circuit of a BBU module, a storage system and a server. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the prior art and the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0031] Figure 1 A schematic diagram of the hot backup control circuit of the BBU module provided by the present application is shown in the figure.

[0032] Figure 2 A structural diagram of the hot backup control circuit of the BBU module provided by the present application is shown in the figure.

[0033] Figure 3 A schematic diagram of the storage system provided by the present application is shown in the figure. DETAILED DESCRIPTION

[0034] The core of the present application is to provide a hot backup control circuit of a BBU module, a storage system and a server. When the PSU module is normally working, the PSU module supplies power to the load through the second control module, and supplies power to the voltage reduction module through the first control module, without consuming the power of the BBU module, reducing the charging frequency of the BBU module, prolonging the service life of the BBU module, reducing the use cost of the customer and the maintenance cost of the company. The voltage reduction module is in a normally open state. When a fault occurs in the PSU module or between the PSU module and the load, the first control module controls the connection between the BBU module and the voltage reduction module, the second control module controls the connection between the voltage reduction module and the load, and the BBU module supplies power to the load through the voltage reduction module, without consuming time for waiting, thereby improving the reliability of the storage system.

[0035] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0036] Please refer to Figure 1 , Figure 1 A schematic diagram of a hot backup control circuit of a BBU module provided by the present application comprises a PSU module 101, a BBU module 102 and a step-down module 104, and further comprises:

[0037] a first control module 103, a first end of which is connected with an output end of the PSU module 101 and a first end of a second control module 105, a second end of which is connected with an output end of the BBU module 102, and a third end of which is connected with an input end of the step-down module 104, for connecting the first end of the first control module 103 with the third end of the first control module 103 when the PSU module 101 is working normally, so as to supply power to the step-down module 104 by the PSU module 101, and connecting the second end of the first control module 103 with the third end of the first control module 103 when the PSU module 101 is faulty, so as to supply power to the step-down module 104 by the BBU module 102;

[0038] a second control module 105, a second end of which is connected with an output end of the step-down module 104, and a third end of which is connected with a load 106, for connecting the first end of the second control module 105 with the third end of the second control module 105 when the PSU module 101 is working normally, so as to supply power to the load 106 by the PSU module 101, and connecting the second end of the second control module 105 with the third end of the second control module 105 when the PSU module 101 is faulty, so as to supply power to the load 106 by the BBU module 102 through the step-down module 104.

[0039] In the specific embodiments, the step-down module 104 and the BBU module 102 are in a normal open state, i.e. the hot backup function is realized, when the PSU module 101 is working normally, the PSU module 101 is connected with the step-down module 104 through the first control module 103 to supply power to the step-down module 104, so as to provide the required consumption for the step-down module 104 by the PSU module 101.

[0040] The present embodiment does not limit the specific number of PSUs in the PSU module 101, and the PSUs are connected together in a parallel manner to convert alternating current into stable direct current and provide the required voltage for the load 106.

[0041] The embodiment does not limit the specific type of the BBU in the BBU module 102, for example, the BBU can be a three-string type BBU, or can be a four-string type BBU, or can be another type. Among them, the full voltage of the three-string type BBU is 12.3V, and the full voltage of the four-string type BBU is 16.4V.

[0042] In some embodiments, the output voltage of the BBU module 102 is stabilized below the voltage value of the lowest output voltage of the PSU module 101 by the voltage reduction module 104, that is, the voltage value output by the BBU module 102 via the voltage reduction module 104 is slightly lower than the normal output voltage range of the PSU module 101, so that when the voltage value output by the PSU module 101 is lowered below the voltage value output by the voltage reduction module 104, it is determined that the PSU module 101 has a failure. For example, the output voltage range of the PSU module 101 is generally around 12V, and the voltage reduction module 104 at the output end of the BBU module 102 can stabilize the output voltage of the BBU module 102 at around 11V; that is, it is ensured that in any scenario, as long as the PSU module 101 is working normally, the output voltage of the BBU module 102 is less than the output voltage of the PSU module 101, so as to realize that when the PSU module 101 is working normally, the load 106 is powered by the PSU module 101 through the second control module 105.

[0043] The application provides a hot standby control circuit and a storage system of a BBU module. The connection relationship between the PSU module 101, the BBU module 102, the voltage reduction module 104, and the load 106 is controlled by the first control module 103 and the second control module 105, so as to realize power supply to the load 106 in different states of the PSU module 101: when the PSU module 101 is working normally, the PSU module 101 powers the load 106 through the second control module 105, and at the same time, the first control module 103 supplies power to the voltage reduction module 104, without consuming the power of the BBU module 102, reducing the charging frequency of the BBU module 102, prolonging the service life of the BBU module 102, and reducing the use cost of customers and the maintenance cost of the company; and the voltage reduction module 104 is in a normal open state, when a failure occurs inside the PSU module 101 or between the PSU module 101 and the load 106, the first control module 103 controls the connection between the BBU module 102 and the voltage reduction module 104, the second control module 105 controls the connection between the voltage reduction module 104 and the load 106, and the BBU module 102 powers the load 106 through the voltage reduction module 104, without consuming time for waiting, and improving the reliability of the storage system.

[0044] On the basis of the above embodiment:

[0045] As a preferred embodiment, the first control module 103 comprises:

[0046] The boost module is connected with the output end of the PSU module 101 and the first end of the first controllable switch module, and is used to boost the output voltage of the PSU module 101 to a first preset voltage when the PSU module 101 is working normally, wherein the first preset voltage is greater than the output voltage of the BBU module 102;

[0047] The first controllable switch module is connected with the second end of the second controllable switch module and the output end of the step-down module 104, and is used to be closed when the voltage of the first end of the first controllable switch module is greater than the voltage of the second end of the first controllable switch module, so that the PSU module 101 supplies power to the step-down module 104 through the boost module; otherwise, the first controllable switch module is opened.

[0048] The second controllable switch module is connected with the output end of the BBU module 102, and is used to be closed when the voltage of the first end of the second controllable switch module is greater than the voltage of the second end of the second controllable switch module, so that the BBU module 102 supplies power to the step-down module 104; otherwise, the second controllable switch module is opened.

[0049] It should be noted that the first controllable switch module and the second controllable switch module can be a half-controlled semiconductor device, a fully-controlled semiconductor device, or a combination of other devices.

[0050] The embodiment does not limit the specific structure of the boost module. When a three-string BBU is selected as the BBU module 102, the boost module boosts the output of the PSU module 101 to 12.3V or above; when a four-string BBU is selected as the BBU module 102, the boost module boosts the output of the PSU module 101 to 16.4V or above, so as to ensure that the voltage of the PSU module 101 after being boosted is higher than the output voltage of the BBU module 102 when the PSU module 101 is working normally, and the PSU module 101 supplies power to the step-down module 104 through the boost module.

[0051] The embodiment provides a specific implementation of the first control module 103. When the PSU module 101 is working normally, the voltage output by the PSU module 101 through the boost module is greater than the output voltage of the BBU module 102, the first controllable switch module is turned on, and the PSU module 101 supplies power to the step-down module 104, without consuming the power of the BBU module 102, thereby prolonging the service life of the BBU module 102. Meanwhile, the structure of the circuit used in the embodiment is relatively simple and better realized.

[0052] As a preferred embodiment, the first controllable switch module and the second controllable switch module each include:

[0053] The first controllable semiconductor device has a first end connected to the first end of the corresponding controllable switch module, a second end connected to the second end of the corresponding controllable switch module, and a control end connected to the output end of the first control chip.

[0054] The first control chip has a first end connected to the first end of the first controllable semiconductor device and a second end connected to the second end of the first controllable semiconductor device, and is configured to control the first controllable semiconductor device to be closed when the voltage at the first end of the first controllable semiconductor device is greater than the voltage at the second end of the first controllable semiconductor device, and to control the first controllable semiconductor device to be opened otherwise.

[0055] The first controllable semiconductor device can be an NMOS (N-Metal-Oxide-Semiconductor) tube, a PMOS (P-Metal-Oxide-Semiconductor) tube, a bipolar junction transistor, or the like.

[0056] The first controllable semiconductor device and the first control chip are used in combination to realize the function of the corresponding controllable switch module, which is conducive to miniaturization of the device. In addition, the combination of the first controllable semiconductor device and the first control chip also has the effect of preventing backflow, thereby improving the reliability and safety of the circuit.

[0057] As a preferred embodiment, the first controllable semiconductor device is an NMOS tube, the source of the NMOS tube is the first end of the first controllable semiconductor device, the drain of the NMOS tube is the second end of the first controllable semiconductor device, and the gate of the NMOS tube is the control end of the first controllable semiconductor device.

[0058] In view of cost, the NMOS tube is used as the first controllable semiconductor device, which is inexpensive and has the advantages of high rated current, small saturation voltage drop, and small internal resistance, thereby hardly consuming energy and hardly affecting the output voltage.

[0059] As a preferred embodiment, the second control module 105 includes:

[0060] The third controllable switch module has a first end connected to the output end of the PSU module 101 and the first end of the first control module 103, respectively, and a second end connected to the input end of the load 106 and the second end of the fourth controllable switch module, respectively, and is configured to be closed when the voltage at the first end of the third controllable switch module is greater than the voltage at the second end of the third controllable switch module, so as to supply power to the load 106 by the PSU module 101; otherwise, the third controllable switch module is opened.

[0061] The fourth controllable switch module has a first end connected to the output end of the voltage reduction module 104, and is used to close the fourth controllable switch module when the voltage at the first end of the fourth controllable switch module is greater than the voltage at the second end of the fourth controllable switch module, so as to enable the BBU module 102 to supply power to the load 106 through the voltage reduction module 104; otherwise, the fourth controllable switch module is opened.

[0062] As a preferred embodiment, the third controllable switch module and the fourth controllable switch module each include:

[0063] The second controllable semiconductor device has a first end corresponding to the first end of the corresponding controllable switch module, a second end corresponding to the second end of the corresponding controllable switch module, and a control end connected to the output end of the second control chip.

[0064] The second control chip has a first end connected to the first end of the second controllable semiconductor device and a second end connected to the second end of the second controllable semiconductor device, and is used to control the second controllable semiconductor device to be closed when the voltage at the first end of the second controllable semiconductor device is greater than the voltage at the second end of the second controllable semiconductor device, and to be opened otherwise.

[0065] As a preferred embodiment, the source of the NMOS tube is the first end of the second controllable semiconductor device, the drain of the NMOS tube is the second end of the second controllable semiconductor device, and the gate of the NMOS tube is the control end of the second controllable semiconductor device.

[0066] The specific detailed description is the same as the above-mentioned embodiment, and will not be repeated here.

[0067] As a preferred embodiment, the application further includes:

[0068] The charging module has an input end connected to the output end of the PSU module 101 and an output end connected to the input end of the BBU module 102, and is used to adjust the output voltage and output current of the PSU to a preset charging voltage and charging current to charge the BBU module 102 when the PSU module 101 is working normally.

[0069] The present embodiment does not limit the specific structure of the charging module. In a specific embodiment, a four-tube buck-boost circuit is usually used to realize the function of the charging module: when the input voltage is greater than the voltage of the BBU module 102, the buck-boost mode is used to charge the BBU module 102, and the four-tube buck-boost works in the buck mode (buck mode); when the input voltage is less than the voltage of the BBU, the boost mode is used to charge the BBU, and the four-tube buck-boost works in the boost mode (boost mode).

[0070] Please refer to Figure 2 ,Figure 2 A structure diagram of a hot backup control circuit of a BBU module is provided in the present application:

[0071] The output of the PSU module 202 is output to 16.7V through the boost circuit, and the highest output voltage of the 4-series 3-parallel BBU module 205 is 16.4V. The output of the PSU module 202 after being boosted is connected with the first controllable switch module 204, and the output of the BBU module 205 is connected with the second controllable switch module 206.

[0072] Since the voltage output by the PSU module 202 through the boost circuit 203 is higher than the output voltage of the BBU module 205, when the PSU module 202 is working normally, the BBU module 205 is charged through the buck-boost circuit 201, the first controllable switch module 204 is turned on, the second controllable switch module 206 is turned off, and the loss of the buck circuit 207 is provided by the PSU module 202. The output voltage is reduced to 11.8V by the buck circuit 207, and the output voltage of the PSU module 202 is 12V, so the third controllable switch module 209 is turned on, the fourth controllable switch module 208 is turned off, and the load is powered by the PSU module 202. When the PSU module 202 fails, the voltage of the PSU module 202 after being boosted by the boost circuit 203 is still 0, and the output voltage of the BBU module 205 is higher than the voltage of the PSU module 202 after being boosted, so the first controllable switch module 204 is turned off, the second controllable switch module 206 is turned on, and the buck circuit 207 still works normally at this time, and the output voltage is 11.8V, so the third controllable switch module 209 is turned off, the fourth controllable switch module 208 is turned on, and the load 210 is powered by the BBU module 205.

[0073] Since the buck circuit 207 is in an open state regardless of whether the entire system is in a PSU module 202 power supply state or a BBU module 205 power supply state, the conversion from the PSU module 202 power supply state to the BBU module 205 power supply state does not require switching time, and the BBU module 205 is in a hot backup state. When the PSU module 202 is working normally, the loss of the buck circuit 207 is provided by the PSU module 202, and the BBU module 205 is in a discharge state, so the service life of the BBU module 205 is not damaged.

[0074] Please refer to Figure 3 , Figure 3 A schematic diagram of a storage system is provided in the present application, which comprises a hard disk 302 and further comprises the hot backup control circuit 301 of the BBU module as described above, and the hot backup control circuit 301 is connected with the hard disk 302.

[0075] The present application further provides a server comprising the storage system as described above.

[0076] The various embodiments described in this specification are intended to be exemplary only. The subject matter described in this specification can be implemented in software, hardware, firmware, or various combinations thereof, and preferred embodiments can be implemented in software and / or firmware on a digital signal processor, microprocessor, host or other processing unit using software routines that can be stored in such memory devices as read-only memory (ROM), random-access memory (RAM), nonvolatile / flash memory, or the like. The routines can be implemented either in an object-oriented or procedural / modular fashion, as is known to those skilled in the art, and can be written in a variety of programming languages, for use with a variety of hardware and / or software

[0077] It is also important to note that the use of relational terms, such as first and second, and the like, are used solely to distinguish one from another entity or action without necessarily implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0078] The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hot-standby control circuit of a BBU module, characterized in that, The power supply system comprises a PSU module, a BBU module and a step-down module, and further comprises: a first control module, a first end of which is connected with an output end of the PSU module and a first end of a second control module, a second end of which is connected with an output end of the BBU module, and a third end of which is connected with an input end of the step-down module, for connecting the first end of the first control module with the third end of the first control module when the PSU module is in normal operation, so as to supply power to the step-down module by the PSU module, and for connecting the second end of the first control module with the third end of the first control module when the PSU module is in failure, so as to supply power to the step-down module by the BBU module; the second control module, a second end of which is connected with an output end of the step-down module, and a third end of which is connected with a load, for connecting the first end of the second control module with the third end of the second control module when the PSU module is in normal operation, so as to supply power to the load by the PSU module, and for connecting the second end of the second control module with the third end of the second control module when the PSU module is in failure, so as to supply power to the load by the BBU module through the step-down module.

2. The hot-standby control circuit of a BBU module of claim 1, wherein, the first control module comprises: a step-up module, an input end of which is connected with an output end of the PSU module, and an output end of which is connected with a first end of a first controllable switch module, for raising the output voltage of the PSU module to a first preset voltage when the PSU module is in normal operation, the first preset voltage being greater than the output voltage of the BBU module; the first controllable switch module, a second end of which is connected with a second end of a second controllable switch module and an input end of the step-down module, for being closed when the voltage at the first end of the first controllable switch module is greater than the voltage at the second end of the first controllable switch module, so as to supply power to the step-down module by the PSU module through the step-up module, and for being opened otherwise; the second controllable switch module, a first end of which is connected with an output end of the BBU module, for being closed when the voltage at the first end of the second controllable switch module is greater than the voltage at the second end of the second controllable switch module, so as to supply power to the step-down module by the BBU module, and for being opened otherwise.

3. The hot-standby control circuit of a BBU module of claim 2, wherein, the first controllable switch module and the second controllable switch module each comprise: a first controllable semiconductor device, a first end of which is the first end of the corresponding controllable switch module, a second end of which is the second end of the corresponding controllable switch module, and a control end of which is connected with an output end of a first control chip; the first control chip, a first end of which is connected with the first end of the first controllable semiconductor device, and a second end of which is connected with the second end of the first controllable semiconductor device, for controlling the first controllable semiconductor device to be closed when the voltage at the first end of the first controllable semiconductor device is greater than the voltage at the second end of the first controllable semiconductor device, and for controlling the first controllable semiconductor device to be opened otherwise.

4. The hot-standby control circuit of a BBU module of claim 3, wherein, the first controllable semiconductor device is an NMOS tube, a source of the NMOS tube being the first end of the first controllable semiconductor device, a drain of the NMOS tube being the second end of the first controllable semiconductor device, and a gate of the NMOS tube being the control end of the first controllable semiconductor device.

5. The hot-standby control circuit of a BBU module of claim 1, wherein, The second control module comprises: A third controllable switch module, a first end of which is connected with the output end of the PSU module and the first end of the first control module respectively, and a second end of which is connected with the input end of the load and the second end of the fourth controllable switch module respectively, for closing when the voltage at the first end of the third controllable switch module is greater than the voltage at the second end of the third controllable switch module, so as to make the PSU module supply power to the load; otherwise, the third controllable switch module is opened; A fourth controllable switch module, a first end of which is connected with the output end of the voltage reduction module, for closing when the voltage at the first end of the fourth controllable switch module is greater than the voltage at the second end of the fourth controllable switch module, so as to make the BBU module supply power to the load through the voltage reduction module; otherwise, the fourth controllable switch module is opened.

6. The hot-standby control circuit of a BBU module of claim 5, wherein, The third controllable switch module and the fourth controllable switch module each comprise: A second controllable semiconductor device, a first end of which is the first end of the corresponding controllable switch module, a second end of which is the second end of the corresponding controllable switch module, and a control end of which is connected with the output end of the second control chip; The second control chip, a first end of which is connected with the first end of the second controllable semiconductor device, and a second end of which is connected with the second end of the second controllable semiconductor device, for controlling the second controllable semiconductor device to close when the voltage at the first end of the second controllable semiconductor device is greater than the voltage at the second end of the second controllable semiconductor device, and otherwise, for controlling the second controllable semiconductor device to open.

7. The hot-standby control circuit of a BBU module of claim 6, wherein, The second controllable semiconductor device is an NMOS tube, a source of the NMOS tube is the first end of the second controllable semiconductor device, a drain of the NMOS tube is the second end of the second controllable semiconductor device, and a gate of the NMOS tube is the control end of the second controllable semiconductor device.

8. The hot-standby control circuit of a BBU module according to any one of claims 1 to 7, wherein, Further comprising: A charging module, an input end of which is connected with the output end of the PSU module, and an output end of which is connected with the input end of the BBU module, for adjusting the output voltage and output current of the PSU to a preset charging voltage and charging current to charge the BBU module when the PSU module is working normally.

9. A storage system, characterized by The storage system comprises a hard disk, and further comprises the hot backup control circuit of the BBU module according to any one of claims 1-8, the hot backup control circuit being connected with the hard disk.

10. A server, characterized by The storage system according to claim 9. The storage system according to claim 9.

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