Power supply control method and device, control terminal and storage medium

Abstract

The application provides a power supply control method, device, control terminal and storage medium. The control method comprises: when a power supply shutdown instruction is detected, the voltage of a DC bus is acquired; if the voltage of the DC bus is greater than a preset voltage, the duty cycle between the input end of a DC conversion module and the output end of the DC conversion module is turned on to form a discharge path. In the application, when the power supply is shut down, the DC conversion module is driven to be closed, so that the duty cycle between the input and output of the DC conversion module is turned on to form a discharge loop when the DC bus is overvoltage, the energy of the rectifier module cannot be released to cause the DC bus to be overvoltage, and equipment failure is caused, and the safety and stability of the power supply are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of power supply technology, and in particular to a power supply control method, device, control terminal, and storage medium. Background Technology

[0002] Figure 1 A power supply topology diagram is shown. The rectified AC power supply powers the load 13 via a DC-DC converter module 12. To suppress noise from the AC power supply, an inductor is typically included in the rectifier module 11. When the power supply is turned off, the drive of the DC-DC converter module 12 is shut down, and the energy from the rectifier module 11, which serves as the input stage of the DC-DC converter module 12, cannot be released. If the DC bus capacitance is small, the DC bus voltage will be overcharged, causing the components of the DC-DC converter module 12 to break down, resulting in power supply damage and seriously affecting power supply safety. Summary of the Invention

[0003] This invention provides a power supply control method, device, control terminal, and storage medium to solve the problem in the prior art where the DC bus voltage is overcharged when the power supply is turned off, affecting power supply safety.

[0004] In a first aspect, embodiments of the present invention provide a power supply control method, the power supply including: a rectifier module, a DC bus, and a DC-DC converter module; the input terminal of the rectifier module is connected to an AC power supply, and the output terminal of the rectifier module is connected to the input terminal of the DC-DC converter module through the DC bus; the output terminal of the DC-DC converter module is connected to a load; wherein, the rectifier module includes an energy storage element, and the output terminal of the DC-DC converter module includes a capacitor;

[0005] The above control methods include:

[0006] When a power-off command is detected, the voltage of the DC bus is acquired;

[0007] If the voltage of the DC bus is greater than the preset voltage, the duty cycle between the input and output terminals of the DC-DC converter module is turned on to form a discharge path.

[0008] Secondly, embodiments of the present invention provide a power supply control device, the power supply including: a rectifier module, a DC bus, and a DC-DC converter module; the input terminal of the rectifier module is connected to an AC power supply, and the output terminal of the rectifier module is connected to the input terminal of the DC-DC converter module through the DC bus; the output terminal of the DC-DC converter module is connected to a load; wherein, the rectifier module includes an energy storage element, and the output terminal of the DC-DC converter module includes a capacitor;

[0009] The aforementioned control device includes:

[0010] The parameter acquisition module is used to acquire the voltage of the DC bus when a power-off command is detected;

[0011] The energy discharge module is used to control the duty cycle between the input and output terminals of the DC-DC converter module to form a discharge path if the voltage of the DC bus is greater than the preset voltage.

[0012] Thirdly, embodiments of the present invention provide a control terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the power control method as described in the first aspect or any possible implementation of the first aspect.

[0013] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the power supply control method as described in the first aspect or any possible implementation thereof.

[0014] This invention provides a power supply control method, device, control terminal, and storage medium. The power supply includes a rectifier module, a DC bus, and a DC-DC converter module. The input terminal of the rectifier module is connected to an AC power source, and the output terminal of the rectifier module is connected to the input terminal of the DC-DC converter module via the DC bus. The output terminal of the DC-DC converter module is connected to a load. The rectifier module includes an energy storage element, and the output terminal of the DC-DC converter module includes a capacitor. The control method includes: when a power-off command is detected, acquiring the voltage of the DC bus; if the voltage of the DC bus is greater than a preset voltage, controlling the duty cycle between the input terminal and the output terminal of the DC-DC converter module to conduct, forming a discharge path. In this invention, when the power supply is turned off, the drive of the DC-DC converter module is shut down, causing the DC bus to overcharge. Controlling the duty cycle between the input and output of the DC-DC converter module allows the energy from the preceding stage to be discharged through the DC-DC converter module, preventing the rectifier module from failing to release energy and causing overvoltage on the DC bus, thus preventing equipment failure and effectively improving the safety and stability of the power supply. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a topology diagram of a power supply;

[0017] Figure 2 This is a flowchart illustrating the implementation of a power control method provided in an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the circuit structure of a power supply provided in an embodiment of the present invention;

[0019] Figure 4 yes Figure 3 Timing diagram of each MOSFET when the DC-DC converter module is working normally;

[0020] Figure 5 yes Figure 3 Timing diagram of each MOSFET when the DC-DC converter module forms a discharge path;

[0021] Figure 6 This is a schematic diagram of the circuit structure of another DC-DC converter module provided in an embodiment of the present invention;

[0022] Figure 7 This is a waveform diagram of the power control method provided in the embodiment of the present invention during execution.

[0023] Figure 8 This is a schematic diagram of the structure of a power control device provided in an embodiment of the present invention;

[0024] Figure 9 This is a schematic diagram of the control terminal provided in an embodiment of the present invention. Detailed Implementation

[0025] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0026] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0027] See Figure 1 The diagram illustrates a power supply topology. The power supply includes: a rectifier module 11, DC buses (BUS+ and BUS-), and a DC-DC converter module 12. The input of the rectifier module 11 is connected to an AC power source, and the output of the rectifier module 11 is connected to the input of the DC-DC converter module 12 via the DC bus. The output of the DC-DC converter module 12 is connected to a load 13. The rectifier module 11 includes an energy storage element, and the output of the DC-DC converter module 12 includes a capacitor C2 (for stabilizing the output voltage).

[0028] Based on the above power supply Figure 2 A schematic diagram illustrating the implementation flow of a power supply control method is shown. Specifically, the control method includes:

[0029] S101: When a power-off command is detected, obtain the voltage of the DC bus;

[0030] S102: If the voltage of the DC bus is greater than the preset voltage, the duty cycle between the input terminal and the output terminal of the DC-DC converter module 12 is controlled to form a discharge path.

[0031] refer to Figure 1 In the power supply, the rectifier module 11 rectifies the AC power to obtain DC power, which is then converted into a suitable voltage by the DC-DC converter module 12 to power the load 13. Based on Figure 1 In the power supply topology, since the DC-DC converter module 12 typically uses a switching transistor to achieve voltage conversion, when the power supply is turned off, the drive of the DC-DC converter module 12 will be shut down, and the connection between the rectifier module 11 and the subsequent stage will be disconnected. At this time, since the rectifier module 11 usually contains energy storage components such as inductors and / or capacitors, the energy stored in the energy storage components has nowhere to be released, resulting in an increase in the DC bus voltage, which can seriously damage the equipment.

[0032] In this embodiment of the invention, when a power-off command is detected (the power-off command includes commands issued manually through the control terminal to control the power-off, as well as commands issued by the controller to control the power-off caused by a power abnormality), and the DC bus voltage is too high, the duty cycle of the DC-DC converter module 12 is turned on. This allows the energy of the rectifier module 11 to be slowly released through the DC-DC converter module 12 and other components in the auxiliary circuit. The energy release methods mainly include transferring the energy to the capacitor C2 at the output terminal of the DC-DC converter module 12, the component losses of the DC-DC converter module 12, and other auxiliary circuits that draw power from the output terminal of the DC-DC converter module 12 (such as auxiliary power supplies or cooling fans). This avoids overcharging of the DC bus voltage due to the energy of the rectifier module 11 having nowhere to be released, which could damage the equipment and effectively improve the safety and stability of the power supply.

[0033] Specifically, the input and output terminals of the DC-DC converter module 12 can be switched on with a fixed duty cycle, a variable duty cycle, or a frequency conversion, without any restrictions.

[0034] Furthermore, the preset voltage can be 450V. The specific voltage can be set according to actual application requirements and is not limited here.

[0035] In one possible implementation, S102 may include:

[0036] S1021: Control the DC-DC converter module 12 to conduct between its input terminal and output terminal according to a preset duty cycle.

[0037] In this embodiment of the invention, the DC-DC converter module 12 is controlled to conduct according to a preset duty cycle, which facilitates control and ensures stable energy discharge. In one possible implementation, the DC-DC converter module 12 may include: a first inductor L1; wherein, the first inductor L1 is connected in series in the path between the input terminal and the output terminal of the DC-DC converter module 12; S1021 may include:

[0038] 1. Real-time detection of the current flowing through the first inductor L1;

[0039] 2. If the current flowing through the first inductor L1 is less than the preset current, then the input terminal and the output terminal of the DC-DC converter module 12 are connected according to the preset duty cycle.

[0040] 3. If the current flowing through the first inductor L1 is not less than the preset current, then the input terminal and the output terminal of the DC-DC converter module 12 are disconnected.

[0041] refer to Figure 3 In this embodiment of the invention, the DC-DC converter module 12 is equipped with a first inductor L1, which is connected in series between the input and output terminals of the DC-DC converter module 12, i.e., in the discharge path. Typically, the inductance of the first inductor L1 is small. When the discharge path is formed, the current flowing through the first inductor L1 may become very high, which may affect the inductor's performance or even burn it out. Therefore, this embodiment of the invention monitors the current flowing through the first inductor L1. When the current flowing through the first inductor L1 is small, it will not affect the first inductor L1, and the duty cycle of the discharge path can be maintained. When the current flowing through the first inductor L1 is too large, the drive of the DC-DC converter module 12 is promptly shut down to cut off the discharge circuit, preventing the first inductor L1 from burning out due to excessive current, thus further ensuring the safety of the power supply.

[0042] In one possible implementation, the DC bus includes: a positive DC bus BUS+ and a negative DC bus BUS-; the output terminals of the rectifier module 11 include: a positive DC output terminal and a negative DC output terminal; the input terminals of the DC-DC converter module 12 include: a positive DC input terminal and a negative DC input terminal; the output terminals of the DC-DC converter module 12 include: a positive power supply terminal and a negative power supply terminal; the positive DC output terminal is connected to the positive DC input terminal through the positive DC bus BUS+; the negative DC output terminal is connected to the negative DC input terminal through the negative DC bus BUS-; the DC-DC converter module 12 can also be an FSBB (four-switch buck-boost) type DC-DC converter, specifically including: a first MOSFET Q1, a second MOSFET Q2, a third MOSFET Q3, and a fourth MOSFET Q4;

[0043] The first terminal of the first MOSFET Q1 is connected to the positive DC input terminal, and the second terminal of the first MOSFET Q1 is connected to the first terminal of the first inductor L1 and the first terminal of the second MOSFET Q2, respectively. The first terminal of the third MOSFET Q3 is connected to the positive load power supply terminal, and the second terminal of the third MOSFET Q3 is connected to the second terminal of the first inductor L1 and the first terminal of the fourth MOSFET Q4, respectively. The second terminal of the second MOSFET Q2 is connected to the second terminal of the fourth MOSFET Q4, the negative DC input terminal, and the negative load power supply terminal, respectively.

[0044] The control of the DC-DC converter module 12's input and output terminals to conduct according to a preset duty cycle includes:

[0045] The first MOSFET Q1 and the third MOSFET Q3 are controlled to turn on synchronously according to a preset duty cycle, while the second MOSFET Q2 and the fourth MOSFET Q4 are controlled to turn off.

[0046] In this embodiment of the invention, the timing diagram of the four MOS transistors when the DC-DC converter module 12 is working normally is as follows: Figure 4 As shown, the specific principle will not be elaborated here. When the DC-DC converter drive is turned off, that is, all four MOSFETs (Q1, Q2, Q3, Q4) are turned off, the input and output terminals of the DC-DC converter module 12 are disconnected, and energy has nowhere to dissipate. At this time, the first MOSFET Q1 and the third MOSFET Q3 can be controlled to conduct simultaneously according to a preset duty cycle, while the second MOSFET Q2 and the fourth MOSFET Q4 are turned off. Refer to the timing diagram. Figure 5 When the first MOSFET Q1 and the third MOSFET Q3 are both turned on, the energy of the rectifier module 11 is discharged through the first MOSFET Q1, the first inductor L1, and the third MOSFET Q3. At this time, the DC-DC converter module 12 operates in buck energy storage mode. When the first MOSFET Q1 and the third MOSFET Q3 are both turned off, the body diodes of the second MOSFET Q2 and the third MOSFET Q3 act as freewheeling diodes, forming a path with the first inductor L1 to release the energy on the first inductor L1. At this time, the DC-DC converter module 12 operates in buck freewheeling mode.

[0047] In other embodiments, if the DC-DC converter module 12 only needs to implement unidirectional buck-boost, the second MOSFET Q2 and the third MOSFET Q3 can be replaced with diodes (D3 and D4), such as... Figure 6 As shown, in this embodiment, the input terminal and the output terminal of the DC-DC converter module 12 are connected according to a preset duty cycle, specifically:

[0048] The first MOSFET Q1 is controlled to turn on according to a preset duty cycle, and the fourth MOSFET Q4 is controlled to turn off.

[0049] refer to Figure 6When the DC-DC converter module 12 is used as a unidirectional buck-boost circuit, only the operation of the first MOSFET Q1 needs to be controlled to form a discharge path. The principle is the same as that of FBSS (four-switch buck-boost), but the control method is simpler.

[0050] In one possible implementation, the preset duty cycle is no greater than 0.5, and can specifically be 0.5.

[0051] A larger preset duty cycle results in a faster rise in current flowing through the first inductor L1. If the preset duty cycle is set too large, it will lead to overcharging of the inductor current flowing through L1, affecting the safety and stability of the power supply; if the preset duty cycle is too small, the discharge time will be too long. Therefore, in this embodiment of the invention, the preset duty cycle is set to 0.5, allowing the power supply to safely discharge within a reasonable timeframe, effectively ensuring the safety and stability of the power supply.

[0052] Specifically, the preset duty cycle can be set according to actual application requirements. Since the current flowing through the first inductor L1 is also related to the inductance of the first inductor L1, the preset duty cycle can be set according to the value of the first inductor L1. If the inductance of the first inductor L1 is large, the value of the preset duty cycle is relatively small to ensure the safety of the power supply equipment; if the inductance of the first inductor L1 is small, the value of the preset duty cycle can be relatively large to achieve energy discharge more quickly. The specific value of the preset duty cycle is not limited.

[0053] In one possible implementation, the preset current can be 80A.

[0054] Specifically, the magnitude of the preset current can be set according to the parameters of the first inductor L1 to ensure that the current flowing through the first inductor L1 below the preset current is safe, without any specific limitation.

[0055] In one possible implementation, the energy storage element can be an inductor; the rectifier module 11 may include: three second inductors L2, three upper bridge arm diodes D1 and three lower bridge arm diodes D2; each second inductor L2, each upper bridge arm diode D1 and each lower bridge arm diode D2 corresponds to one of them.

[0056] For each second inductor L2, the first end of the second inductor L2 is connected to the corresponding AC power supply, and the second end of the second inductor L2 is connected to the anode of the corresponding upper bridge arm diode D1 and the cathode of the corresponding lower bridge arm diode D2. The cathode of the upper bridge arm diode D1 corresponding to the second inductor L2 is connected to the DC bus BUS, and the anode of the lower bridge arm diode D2 corresponding to the second inductor L2 is grounded.

[0057] In this embodiment of the invention, the rectifier module 11 is a three-phase bridge rectifier circuit, and the energy storage element is an inductor. When the drive of the DC-DC converter module 12 is turned off, the energy stored in the second inductor L2 has nowhere to be released, resulting in overcharging of the DC bus.

[0058] Furthermore, the rectifier module 11 can also be a single-phase bridge rectifier circuit; for example, the rectifier module 11 only contains... Figure 3 The rectifier module 11 is a rectifier bridge. Other rectifier structures are also possible, and are not limited here.

[0059] Specifically, based on Figure 3 The power supply shown is from Figure 7 It can be seen that when the first MOSFET Q1 and the third MOSFET Q3 are driven, the DC bus voltage drops significantly, and the inductor current flowing through the first inductor L1 rises rapidly. When the inductor current flowing through the first inductor L1 exceeds the preset current, the driving of the first MOSFET Q1 and the third MOSFET Q3 is turned off, and the DC bus voltage rises again. When it exceeds the preset voltage, the driving is turned on again, and the DC bus voltage drops and tends to stabilize, preventing overcharging.

[0060] Therefore, the power control method provided in this embodiment of the invention can effectively avoid overcharging of the DC bus voltage caused by sudden load unloading, and at the same time avoid damage to the first inductor L1, thus ensuring the safety and stability of the power supply.

[0061] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0062] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0063] Figure 8 A schematic diagram of the power supply control device provided in an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below:

[0064] refer to Figure 1 The power supply includes: a rectifier module 11, DC buses (BUS+ and BUS-), and a DC-DC converter module 12; the input terminal of the rectifier module 11 is connected to the AC power supply, and the output terminal of the rectifier module 11 is connected to the input terminal of the DC-DC converter module 12 via the DC bus; the output terminal of the DC-DC converter module 12 is connected to the load 13; wherein, the rectifier module 11 includes an energy storage element, and the output terminal of the DC-DC converter module 12 includes a capacitor; the output terminal of the DC-DC converter module 12 includes a capacitor.

[0065] The aforementioned control device includes:

[0066] The parameter acquisition module 21 is used to acquire the voltage of the DC bus when a power-off command is detected;

[0067] The energy discharge module 22 is used to control the duty cycle between the input terminal and the output terminal of the DC-DC converter module 12 to form a discharge path if the voltage of the DC bus is greater than the preset voltage.

[0068] In one possible implementation, the energy discharge module 22 may include:

[0069] The discharge unit 221 is used to control the connection between the input terminal and the output terminal of the DC-DC converter module 12 according to a preset duty cycle.

[0070] In one possible implementation, the DC-DC converter module 12 may include: a first inductor L1; wherein the first inductor L1 is connected in series in the path between the input terminal and the output terminal of the DC-DC converter module 12; the discharge unit 221 may include:

[0071] The current monitoring subunit 2211 is used to detect the current flowing through the first inductor L1 in real time;

[0072] The first control subunit 2212 is used to control the input terminal and the output terminal of the DC-DC converter module 12 to conduct according to a preset duty cycle if the current flowing through the first inductor L1 is less than a preset current.

[0073] The second control subunit 2213 is used to disconnect the input terminal and the output terminal of the DC-DC converter module 12 if the current flowing through the first inductor L1 is not less than a preset current.

[0074] Figure 9 This is a schematic diagram of the control terminal provided in an embodiment of the present invention. Figure 9 As shown, the control terminal 3 in this embodiment includes a processor 30 and a memory 31. The memory 31 stores a computer program 32, and the processor 30 calls and runs the computer program 32 stored in the memory 31 to execute the steps in the various power supply control method embodiments described above, for example... Figure 2 The steps S101 to S102 are shown. Alternatively, the processor 30 is used to call and run the computer program 32 stored in the memory 31 to implement the functions of each module / unit in the above-described device embodiments, for example... Figure 8 The functions of modules 21 and 22 shown.

[0075] For example, computer program 32 can be divided into one or more modules / units, one or more of which are stored in memory 31 and executed by processor 30 to complete the present invention. One or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of computer program 32 in control terminal 3. For example, computer program 32 can be divided into... Figure 8 Modules / units 21 to 22 are shown.

[0076] The control terminal 3 can be a desktop computer, laptop, handheld computer, or cloud server, etc. The control terminal 3 may include, but is not limited to, a processor 30 and a memory 31. Those skilled in the art will understand that... Figure 9 This is merely an example of control terminal 3 and does not constitute a limitation on control terminal 3. It may include more or fewer components than shown, or combine certain components, or different components. For example, the terminal may also include input / output devices, network access devices, buses, etc.

[0077] The processor 30 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0078] The memory 31 can be an internal storage unit of the control terminal 3, such as a hard disk or RAM of the control terminal 3. The memory 31 can also be an external storage device of the control terminal 3, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the control terminal 3. Furthermore, the memory 31 can include both internal and external storage units of the control terminal 3. The memory 31 is used to store computer programs and other programs and data required by the terminal. The memory 31 can also be used to temporarily store data that has been output or will be output.

[0079] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0080] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0081] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0082] In the embodiments provided by this invention, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0083] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0084] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0085] If an integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0086] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for controlling a power supply, characterized in that, The power supply includes: a rectifier module, a DC bus, and a DC-DC converter module; the input terminal of the rectifier module is connected to an AC power source, and the output terminal of the rectifier module is connected to the input terminal of the DC-DC converter module via the DC bus; the output terminal of the DC-DC converter module is connected to a load; wherein, the rectifier module includes an energy storage element, and the output terminal of the DC-DC converter module includes a capacitor; the DC-DC converter module includes: a first inductor; wherein, the first inductor is connected in series in the path between the input terminal and the output terminal of the DC-DC converter module; The control method includes: When a power-off command is detected, the voltage of the DC bus is acquired; If the voltage of the DC bus is greater than the preset voltage, the current flowing through the first inductor is detected in real time; if the current flowing through the first inductor is less than the preset current, the input terminal and the output terminal of the DC-DC converter module are controlled to conduct according to a preset duty cycle; if the current flowing through the first inductor is not less than the preset current, the input terminal and the output terminal of the DC-DC converter module are controlled to disconnect.

2. The power supply control method according to claim 1, characterized in that, The DC bus includes a positive DC bus and a negative DC bus; the output terminal of the rectifier module includes a positive DC output terminal and a negative DC output terminal; the input terminal of the DC-DC converter module includes a positive DC input terminal and a negative DC input terminal; the output terminal of the DC-DC converter module includes a positive load power supply terminal and a negative load power supply terminal; the positive DC output terminal is connected to the positive DC input terminal through the positive DC bus; the negative DC output terminal is connected to the negative DC input terminal through the negative DC bus. The DC-DC converter module further includes: a first MOSFET, a second MOSFET, a third MOSFET, and a fourth MOSFET; the first terminal of the first MOSFET is connected to the positive DC input terminal, and the second terminal of the first MOSFET is connected to the first terminal of the first inductor and the first terminal of the second MOSFET; the first terminal of the third MOSFET is connected to the positive load power supply terminal, and the second terminal of the third MOSFET is connected to the second terminal of the first inductor and the first terminal of the fourth MOSFET; the second terminal of the second MOSFET is connected to the second terminal of the fourth MOSFET, the negative DC input terminal, and the negative load power supply terminal. The control of the input terminal and the output terminal of the DC-DC converter module to conduct according to the preset duty cycle includes: The first MOSFET and the third MOSFET are controlled to turn on synchronously according to the preset duty cycle, while the second MOSFET and the fourth MOSFET are controlled to turn off.

3. The power supply control method according to claim 2, characterized in that, The preset duty cycle is 0.

5.

4. The power supply control method according to claim 1, characterized in that, The preset current is 80A.

5. The power supply control method according to any one of claims 1 to 4, characterized in that, The energy storage element is an inductor; the rectifier module includes: three second inductors, three upper bridge arm diodes and three lower bridge arm diodes; each second inductor, each upper bridge arm diode and each lower bridge arm diode corresponds to one another. For each second inductor, the first end of the second inductor is connected to the corresponding AC power supply, and the second end of the second inductor is connected to the anode of the corresponding upper bridge arm diode and the cathode of the corresponding lower bridge arm diode, respectively; the cathode of the upper bridge arm diode corresponding to the second inductor is connected to the DC bus, and the anode of the lower bridge arm diode corresponding to the second inductor is grounded.

6. A power supply control device, characterized in that, The power supply includes: a rectifier module, a DC bus, and a DC-DC converter module; the input terminal of the rectifier module is connected to an AC power source, and the output terminal of the rectifier module is connected to the input terminal of the DC-DC converter module via the DC bus; the output terminal of the DC-DC converter module is connected to a load; wherein, the rectifier module includes an energy storage element, and the output terminal of the DC-DC converter module includes a capacitor; the DC-DC converter module includes: a first inductor; wherein, the first inductor is connected in series in the path between the input terminal and the output terminal of the DC-DC converter module; The control device includes: The parameter acquisition module is used to acquire the voltage of the DC bus when a power-off command is detected; An energy discharge module is used to detect the current flowing through the first inductor in real time; if the current flowing through the first inductor is less than a preset current, the input terminal and the output terminal of the DC-DC converter are controlled to conduct according to a preset duty cycle; if the current flowing through the first inductor is not less than the preset current, the input terminal and the output terminal of the DC-DC converter are controlled to disconnect.

7. A control terminal, characterized in that, It includes a processor and a memory, the memory being used to store a computer program, and the processor being used to call and run the computer program stored in the memory to perform the power supply control method as described in any one of claims 1 to 5.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the power supply control method as described in any one of claims 1 to 5.

Images