Power switching method and multiple-input power system

Abstract

The embodiment of the present application provides a power switching method and a multi-input power supply system, the method is used for controlling input power supply accessed by N power supply modules, and the method comprises the following steps: determining a switching strategy corresponding to each power supply module, wherein the switching strategy is used for indicating a time point of switching input of each power supply module from auxiliary input power supply to main input power supply; and switching the input of each power supply module from the auxiliary input power supply to the main input power supply at the corresponding time point respectively according to the switching strategy, wherein the main input power supply comprises a backup power supply, N is greater than 1, and the method can realize the reduction of inrush current when switching from the auxiliary input power supply to the main input power supply and the reduction of the possibility of output failure by switching the input of different power supply modules in time.

Description

Technical Field

[0001] This invention relates to the field of power supply technology, and in particular to a power switching method and a multi-input power supply system. Background Technology

[0002] High efficiency and reliability are the industry's constant pursuit for data center power supply systems, and dual-input power supplies are increasingly being used in data center power supply systems due to their high reliability.

[0003] A dual-input power supply system refers to a system with two types of power inputs, such as... Figure 1 As shown, the system connects to the PSU (Power Supply Unit) via a main input power supply and an auxiliary input power supply to power the load. When the main input power supply fails, the system can switch to the auxiliary input power supply. However, the auxiliary input power supply is typically a battery and cannot power the system for extended periods. Therefore, the main input power supply includes two parallel power sources: the mains power supply and a backup power supply, ensuring that the backup power supply powers the system when the mains power fails. The backup power supply is typically more sensitive to load changes.

[0004] Therefore, when switching from the auxiliary input power supply to the main input power supply, if the main input power supply is a backup power supply, a large instantaneous inrush current will be generated when a large load is connected at any moment, which will cause the output to fail. Summary of the Invention

[0005] This application provides a power switching method and a multi-input power system to solve the problem of output failure when multiple power supply modules switch from auxiliary input power to main input power at the same time, if the main input power is a backup power supply.

[0006] In a first aspect, this application provides a power switching method, the method being used to control the input power supplied to N power supply modules, including:

[0007] Determine the switching strategy corresponding to each power supply module. The switching strategy is used to indicate the time when the input of each power supply module switches from the auxiliary input power supply to the main input power supply.

[0008] According to the switching strategy, the input of each power supply module is switched from the auxiliary input power supply to the main input power supply at the corresponding time.

[0009] The main input power supply includes a backup power supply, where N is greater than 1.

[0010] Optionally, according to the switching strategy, the input of each power supply module is switched from the auxiliary input power supply to the main input power supply at corresponding times, including:

[0011] Based on the switching strategy, determine the power supply module to be switched at different times;

[0012] At different times, a switching control command is sent to the corresponding power supply module. The switching control command is used to disconnect the switch between the power supply module and the auxiliary input power supply, and to close the switch between the power supply module and the main input power supply.

[0013] Optionally, determine the switching strategy for each power supply module, including:

[0014] Determine the switching sequence of each power supply module;

[0015] The switching times of each power supply module are determined, wherein the time interval between any two adjacent switching times is equal to or greater than the time required for the input of the power supply module to switch from the auxiliary input power supply to the main input power supply.

[0016] Optionally, the method further includes:

[0017] During the process of switching the input of any power supply module from the auxiliary input power supply to the main input power supply, the output current of the power supply module is reduced.

[0018] Optionally, the power supply module includes an AC / DC unit and a DC / DC unit, wherein the AC / DC unit and the DC / DC unit are connected via a capacitor, and the method further includes:

[0019] When switching the input of any power supply module from the auxiliary input power supply to the main input power supply, the voltage of the capacitor corresponding to the power supply module is increased.

[0020] Optionally, the method further includes:

[0021] Check whether the main input power supply can provide power normally;

[0022] When it is detected that the main input power supply can supply power normally, the step of determining the switching strategy corresponding to each power module is executed.

[0023] Optionally, the backup power source is a diesel generator.

[0024] Secondly, this application provides a power switching method for a multi-input power system, the multi-input power system comprising: a first power supply module, a second power supply module, a main input power supply, and an auxiliary input power supply;

[0025] The first power supply module is electrically coupled to the main input power supply through a first switch and electrically coupled to the auxiliary input power supply through a second switch;

[0026] The second power supply module is electrically coupled to the main input power supply through a third switch and to the auxiliary input power supply through a fourth switch;

[0027] The control method includes: when the first power supply module and the second power supply module need to switch from the auxiliary input power supply to the main input power supply, switching the first power supply module and the second power supply module from the auxiliary input power supply to the main input power supply at different times, wherein the main input power supply includes a backup power supply.

[0028] Optionally, switching the first power supply module and the second power supply module from the auxiliary input power supply to the main input power supply at different times includes:

[0029] After the first power supply module switches from the auxiliary input power supply to the main input power supply, the second power supply module switches from the auxiliary input power supply to the main input power supply.

[0030] Optionally, the method further includes:

[0031] When the first power supply module or the second power supply module begins to switch from the auxiliary input power to the main input power, the output current of the first power supply module or the second power supply module is reduced.

[0032] Optionally, the power supply module includes an AC / DC unit and a DC / DC unit, wherein the AC / DC unit and the DC / DC unit are connected via a capacitor, and the method further includes:

[0033] When the first power supply module or the second power supply module begins to switch from the auxiliary input power to the main input power, the voltage of the capacitor in the first power supply module or the second power supply module is increased.

[0034] Optionally, switching the first power supply module and the second power supply module from the auxiliary input power supply to the main input power supply at different times includes:

[0035] When the first power supply module switches from the auxiliary input power supply to the main input power supply, the second switch is disconnected and the first switch is closed; when the second power supply module switches from the auxiliary input power supply to the main input power supply, the fourth switch is disconnected and the third switch is closed.

[0036] Optionally, the method further includes:

[0037] Check whether the main input power supply can provide power normally;

[0038] When it is detected that the main input power supply can supply power normally, the first power supply module and the second power supply module are switched from the auxiliary input power supply to the main input power supply at different times.

[0039] Optionally, the backup power source is a diesel generator.

[0040] Thirdly, this application provides a multi-input power supply system, including: a first power supply module, a second power supply module, a main input power supply and an auxiliary input power supply;

[0041] The first power supply module is electrically coupled to the main input power supply through a first switch and electrically coupled to the auxiliary input power supply through a second switch. The main input power supply includes a backup power supply.

[0042] The second power supply module is electrically coupled to the main input power supply through a third switch and to the auxiliary input power supply through a fourth switch.

[0043] When the first power supply module and the second power supply module need to switch from the auxiliary input power to the main input power, they will switch from the auxiliary input power to the main input power at different times.

[0044] Optionally, after switching the first power supply module from the auxiliary input power supply to the main input power supply, the second power supply module is switched from the auxiliary input power supply to the main input power supply.

[0045] Optionally, during the process of switching the first power supply module from the auxiliary input power supply to the main input power supply, the output current of the first power supply module is controlled to decrease; and,

[0046] During the process of switching the second power supply module from the auxiliary input power supply to the main input power supply, the output current of the second power supply module is reduced.

[0047] Optionally, the power supply module includes an AC / DC unit and a DC / DC unit, and the AC / DC unit and the DC / DC unit are connected by a capacitor;

[0048] When switching the first power supply module from the auxiliary input power supply to the main input power supply, the voltage of the capacitor corresponding to the first power supply module is increased; and,

[0049] When switching the second power supply module from the auxiliary input power supply to the main input power supply, the voltage of the capacitor corresponding to the second power supply module is increased.

[0050] Optionally, when the first power supply module switches from the auxiliary input power supply to the main input power supply, the second switch is disconnected and the first switch is closed; and,

[0051] When the second power supply module switches from the auxiliary input power to the main input power, the fourth switch is disconnected and the third switch is closed.

[0052] Optionally, the system further includes a detection module;

[0053] The detection module is used to detect whether the main input power supply can supply power normally. When the main input power supply can supply power normally, the first power supply module and the second power supply module are switched from the auxiliary input power supply to the main input power supply at different times.

[0054] Optionally, the backup power source is a diesel generator.

[0055] The power switching method and multi-input power system provided in this application embodiment can determine the switching strategy corresponding to each power supply module. The switching strategy is used to indicate the time when the input of each power supply module is switched from the auxiliary input power supply to the main input power supply. According to the switching strategy, the input of each power supply module is switched from the auxiliary input power supply to the main input power supply at the corresponding time. The main input power supply includes a backup power supply, and N is greater than 1. The method switches the input of different power supply modules in a time-division manner to reduce the inrush current when switching from the auxiliary input power supply to the main input power supply and reduce the possibility of output failure. Attached Figure Description

[0056] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 This is a schematic diagram of the structure of a dual-input power supply system provided in an embodiment of the present invention;

[0058] Figure 2 This is a schematic diagram of the structural principle of a power switching method in the prior art.

[0059] Figure 3 This is a schematic diagram of another power switching method in the prior art.

[0060] Figure 4This is a flowchart illustrating a power switching method provided in an embodiment of the present invention.

[0061] Figure 5 This is a schematic diagram of the structural principle of a power switching method provided in an embodiment of the present invention;

[0062] Figure 6 A flowchart illustrating another power switching method provided in an embodiment of the present invention;

[0063] Figure 7 This is a schematic diagram of the structure of a multi-input power supply system provided in an embodiment of the present invention. Detailed Implementation

[0064] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0065] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0066] Figure 1 This is a schematic diagram of the structure of a dual-input power supply system provided in an embodiment of the present invention; as shown below. Figure 1 As shown, the dual-input power system includes two power input terminals, connected to a main input power supply and an auxiliary input power supply respectively. The dual-input power system includes multiple power supply units (PSUs), such as PSU1, PSU2, ..., PSUUn. The input terminals of each power supply module need to be connected to either the main or auxiliary input power supply, and the output terminals of each power supply module are connected to the load. The power supply modules can convert AC power into stable DC power for the load's use.

[0067] The main input power source is the main grid, and the auxiliary input power source is a battery. When the main grid fails, the auxiliary input power source can supply power to the power supply modules. However, the battery cannot supply power to the power supply modules for an extended period. Therefore, the main input power source also includes a backup power source. When the main grid fails and the battery has been supplying power to the power supply modules for a period of time, the backup power source in the main input power source can supply power to the various power supply modules. When supplying power to the various power supply modules through the backup power source, the input of each power supply module needs to be switched from the auxiliary input power source to the main input power source. There are two ways to implement this switching, which are briefly explained below.

[0068] Figure 2 This is a schematic diagram of the structural principle of a power switching method in the prior art, such as... Figure 2 As shown, each power supply module includes two AC / DC units. The main input power supply is connected to one AC / DC unit, and the auxiliary input power supply is connected to the other AC / DC unit. When the main input power supply is active, software can control it to power each power supply module, while the auxiliary input power supply remains in standby mode, meaning the output of the AC / DC unit corresponding to that auxiliary input power supply is reduced. When the main input power supply fails, software controls the auxiliary input power supply to power each power supply module. During this power switching process, because there are two AC / DC units, the input power supply to each AC / DC unit remains unchanged, and the capacitor between the AC / DC unit and the DC / DC unit does not need to undergo a discharge and charge process, thus preventing inrush current. However, this method requires two AC / DC units for each power supply module, resulting in a higher cost for the power supply modules.

[0069] Figure 3 Here is a schematic diagram of another power switching method in the prior art, such as... Figure 3 As shown, to save on power supply module costs, the main input power supply and auxiliary input power supply share a single AC / DC unit. When the main input power supply fails, the input terminals of each AC / DC unit are directly connected to the auxiliary input power supply. However, during this process, neither the main nor auxiliary input power supply can provide power at the moment of switching, requiring the capacitors between the AC / DC and DC / DC units to discharge. When the AC / DC unit connects to the main input power supply, all discharged capacitors need to be charged simultaneously, generating a significant inrush current. Different backup power supplies have varying sensitivities to inrush current; those with lower sensitivity are more expensive. Therefore, this power switching method places higher demands on the backup power supply within the main input power supply, thus increasing system costs.

[0070] Based on the shortcomings of the existing technology, we aim to reduce inrush current during input power switching while lowering system costs, thereby reducing the likelihood of output failure. For the second power switching method mentioned above, inrush current arises from the need to charge the capacitors in all power supply modules simultaneously. Therefore, to avoid inrush current, we can consider switching each power supply module from the auxiliary input power supply to the main input power supply at different times. When using a time-sharing switching method, since the output is established in a time-sharing manner, the input inrush current will appear in stages, thus reducing the inrush current and consequently lowering the likelihood of output failure.

[0071] The technical solution of the present invention will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0072] Figure 4 This is a flowchart illustrating a power switching method provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the method in this embodiment may include:

[0073] S401. Determine the switching strategy corresponding to each power supply module. The switching strategy is used to indicate the time when the input of each power supply module switches from the auxiliary input power supply to the main input power supply.

[0074] In this embodiment, to achieve time-sharing switching of multiple power supply modules from auxiliary input power to main input power, a switching strategy for each power supply module can be generated first. The switching strategy refers to the timing at which the input of each power supply module switches from auxiliary input power to main input power. Specifically, this timing indicates the switching time of each power supply module; alternatively, it can also indicate the time interval between the next switching time and the previous switching time. One or more power supply modules can be switched within a single switching time.

[0075] In each switching operation, the time interval between the next switching moment and the previous switching moment can be different. Furthermore, the number of power supply modules switched during each switching operation can also be different.

[0076] S402. According to the switching strategy, the input of each power supply module is switched from the auxiliary input power supply to the main input power supply at the corresponding time.

[0077] The main input power supply includes a backup power supply, where N is greater than 1.

[0078] In this embodiment, after determining the switching strategy, the switching time of the input of each power supply module is determined. When the switching time is reached, the corresponding power supply module is switched from the auxiliary input power supply to the main input power supply. For example, when there are 5 power supply modules, it is necessary to determine the switching time of the 5 power supply modules. At time 1, the input of power supply module 1 and the input of power supply module 2 are switched from the auxiliary input power supply to the main input power supply. At times 2, 3, and 4, the inputs of power supply modules 3, 4, and 5 are switched from the auxiliary input power supply to the main input power supply, respectively.

[0079] In this embodiment, the main input power source includes the power grid and a backup power source. When the power grid malfunctions or the system itself has special conditions that prevent it from using the power grid, the backup power source can provide power to the system.

[0080] Figure 5 This is a structural schematic diagram of a power switching method provided in an embodiment of the present invention. Figure 5 The diagram illustrates a time-sharing switching method for power supply modules. For a system containing n power supply modules, when switching these modules from auxiliary input power to main input power, n time points can be determined. At each time point, one power supply module is switched from auxiliary input power to main input power. In time-sharing switch 1, the first power supply module is switched from auxiliary input power to main input power; in time-sharing switch 2, the second power supply module is switched; and so on, until time-sharing switch n, when the nth power supply module is switched. By switching one power supply module at a time, the main input power supply provides output current to one module at a time, significantly reducing inrush current compared to simultaneously providing output current to all n modules. Furthermore, the solution of directly switching all power supply modules will cause the steady-state input current to change from 0 to its maximum value all at once; while the time-sharing switching solution will cause the steady-state input current to gradually change from 0 to its maximum value according to the time-sharing switching time. In other words, the slope of the steady-state input current can be made gentler, which can reduce the pressure on the backup power supply.

[0081] The power switching method provided in this invention determines a switching strategy for each power supply module. This switching strategy indicates the timing at which the input of each power supply module switches from an auxiliary input power supply to a main input power supply. According to the switching strategy, the input of each power supply module is switched from the auxiliary input power supply to the main input power supply at the corresponding time. The main input power supply includes a backup power supply. This method reduces the inrush current and the possibility of output failure when switching a power supply module from an auxiliary input power supply to a main input power supply. Simultaneously, it also slows down the slope of the steady-state input current, reducing the pressure on the backup power supply.

[0082] The switching method of the power supply module will be described in detail below with reference to a specific embodiment.

[0083] Figure 6 This is a flowchart illustrating another power switching method provided in an embodiment of the present invention, as shown below. Figure 6 As shown, based on the above embodiments, the method of this embodiment may include:

[0084] S601. Determine the switching sequence of each power supply module.

[0085] In this embodiment, to determine the switching strategy for each power supply module, i.e., to determine the switching time of each power supply module, the switching order of each power supply module can be determined first. For example, the switching order can be obtained according to the arrangement order of the power supply modules, and this arrangement order can be determined as the switching order; alternatively, the reverse order can be used as the switching order; or a randomly generated order can be used as the switching order. The generated arrangement order can contain two or more power supply modules corresponding to one switching order. For example, when there are 5 power supply modules, a switching order containing 5 orders can be generated, switching one power supply module in each switching order. Alternatively, a switching order containing 3 switching orders can be generated, switching at least one power supply module in each switching order.

[0086] S602. Determine the switching time of each power supply module, wherein the time interval between any two adjacent switching times is equal to or greater than the time required for the input of the power supply module to switch from the auxiliary input power supply to the main input power supply.

[0087] In this embodiment, after determining the switching sequence of each power supply module, it is also necessary to determine the switching time of each power supply module. Each power supply module takes a certain amount of time to switch from the auxiliary input power supply to the main input power supply. Therefore, when determining the switching time of a particular power supply module, it can be set so that the switching of the power supply module at the previous switching time completes before the switching of the corresponding power supply module at the next switching time begins. This ensures that the time interval between two adjacent switching times is exactly equal to or greater than the time required for the power supply module to switch, thus minimizing the inrush current.

[0088] Furthermore, in some cases, to achieve a shorter switching time for all power supply modules, the time interval between any two adjacent switching moments can be made shorter than the time required for the power supply module's input to switch from auxiliary input power to main input power. This method allows for a shorter switching time for all power supply modules.

[0089] S603. Based on the switching strategy, determine the power supply module to be switched at different times.

[0090] In this embodiment, after determining the switching order and switching time of each power supply module, the power supply module can be determined according to the switching time. For example, power supply module 1 needs to be switched at the first switching time, power supply module 2 needs to be switched at the second switching time, and power supply modules 3 and 4 need to be switched at the third switching time.

[0091] S604. At the different times, a switching control command is sent to the corresponding power supply module. The switching control command is used to disconnect the switch between the power supply module and the auxiliary input power supply, and to close the switch between the power supply module and the main input power supply.

[0092] After determining the power supply module to be switched at different times, it is checked whether the current time is one of the preset switching times. If so, a switching control command is sent to the corresponding power supply module. Each power supply module is connected to both the main input power supply and the auxiliary input power supply via a switch. The switching control command controls the power supply module to switch from the auxiliary input power supply to the main input power supply. Specifically, the switching control command can open the switch between the corresponding power supply module and the auxiliary input power supply, and close the switch between the corresponding power supply module and the main input power supply.

[0093] The above method ensures that each power supply module switches from the auxiliary input power to the main input power in a time-sharing manner.

[0094] Optionally, the method further includes:

[0095] The system checks whether the main input power supply can provide power normally; when the main input power supply can provide power normally, the system executes the step of determining the switching strategy corresponding to each power module.

[0096] In addition, before switching the power supply modules, it is necessary to determine whether the main input power supply can provide power normally. Only when the main input power supply can provide power normally can the step of switching each power supply module from the auxiliary input power supply to the main input power supply be performed.

[0097] To determine whether the main input power supply can provide normal power, its output voltage can be detected. If the output voltage is greater than 0 or greater than a preset voltage, it indicates that the main input power supply can provide normal power. This normal power supply capability can be determined by the power grid changing from a failed state to a non-failed state, or by the backup power supply being operational.

[0098] Furthermore, it should be noted that the step of checking whether the main input power supply can provide normal power can be performed before or after determining the switching strategies for each power supply module. In other words, it can be determined first that the main input power supply can provide normal power, and then the switching strategies for each power supply module are determined; alternatively, the switching strategies for each power supply module can be determined first, and the switching action can be executed directly once the main input power supply can provide normal power.

[0099] By determining whether the main input power supply can provide power normally, it can be ensured that each power supply module can be successfully switched from the auxiliary input power supply to the main input power supply.

[0100] Optionally, the backup power source is a diesel generator.

[0101] In this embodiment, the backup power source can be a diesel generator. However, diesel generators are quite sensitive to changes in output load. Therefore, it is necessary to limit the number of power supply modules that can switch to the main input power source at the same time.

[0102] By limiting the number of power supply modules that switch to the main input power at the same time, the normal operation of the backup power supply can be guaranteed, and system failure can be avoided.

[0103] The following describes another power switching method in detail with reference to a specific embodiment.

[0104] In addition, when the input of the power supply module is switched using the method described in the above embodiments, other operations can also be performed to improve the beneficial effects of the time-sharing switching scheme.

[0105] Optionally, during the process of switching the input of any power supply module from the auxiliary input power supply to the main input power supply, the output current of the power supply module is reduced.

[0106] In this embodiment, when switching the input of the power supply module from the auxiliary input power supply to the main input power supply, the output current of the power supply module can be reduced. This is achieved by reducing the output voltage of the power supply module through software control, thereby reducing the output current. Alternatively, the output current of the power supply module can be reduced before switching from the auxiliary input power supply to the main input power supply. Here, "before switching to the main input power supply" refers to the moment after the previous power supply module has switched and before the current power supply module switches.

[0107] For example, when switching the power supply module 1 from the auxiliary input power supply to the main input power supply, the output current of the power supply module 1 can be reduced.

[0108] By reducing the output current of the power supply module, the holdup time of the power supply module can be increased. Since the voltage of the capacitor in the power supply module remains unchanged due to the reduction in output current, the output power is reduced, thus increasing the holdup time.

[0109] Furthermore, reducing the output current of the power supply module can further reduce the inrush current. Since neither the auxiliary nor the main input power supply can power the power supply module during the switching process, the capacitors within the power supply module are required to provide power. When the output current decreases, the voltage drop across the capacitors in the power supply module also decreases. And when the power supply module switches to the main input power and needs to charge the capacitors, the resulting inrush current is also reduced.

[0110] Furthermore, reducing the output current of the power supply module can reduce the switching pressure on the Automatic Transfer Switch (ATS). The ATS switching time depends on the power supply module's hold time; the ATS only needs to complete the switching within that hold time. Increasing the hold time results in a correspondingly longer ATS switching time, thus reducing the switching pressure on the ATS.

[0111] Furthermore, by reducing the output current of the power supply module, the system can maintain the set redundancy for an extended period. For example, in an N+1 redundancy system, one power supply module serves as a backup. When one of the N power supply modules fails, the system's redundancy decreases to N+0. Increasing the power supply module's sustainment time maintains the system's redundancy at the set N+1. This is because a short sustainment time would cause the power supply module to lose power and require restarting. For instance, when switching a power supply module from auxiliary input to primary input, if the primary input fails again during the switch, the module needs to be switched back to auxiliary input, increasing the switching time. The sustainment time is generally insufficient for such extreme switching conditions. Conversely, a longer sustainment time prevents the power supply module from losing power, maintaining the redundancy at N+1.

[0112] By reducing the output current of the corresponding power supply module based on time-sharing switching, the sustaining time of the corresponding power supply module can be increased, the inrush current can be further reduced, the pressure on the ATS switching of the corresponding power supply module can be reduced, and the redundancy of the system can be improved.

[0113] Optionally, when switching the input of any power supply module from the auxiliary input power supply to the main input power supply, the voltage of the capacitor corresponding to the power supply module is increased.

[0114] The power supply module includes an AC / DC unit and a DC / DC unit, which are connected by a capacitor.

[0115] In this embodiment, the capacitor voltage of the power supply module can be increased through software control. For example, when switching power supply module 1 from auxiliary input power to main input power, the capacitor voltage of power supply module 1 can be increased. Increasing the capacitor voltage of the power supply module increases the sustaining time of the power supply module. Increasing the capacitor voltage has the same effect as reducing the output current of the power supply module to be switched; therefore, increasing the capacitor voltage extends the sustaining time of the power supply module.

[0116] Alternatively, the capacitor voltage of the power supply module can be increased before switching its input from the auxiliary input power supply to the main input power supply. Here, "before switching to the main input power supply" refers to the moment between the completion of the previous power supply module's switch and the start of this power supply module's switch.

[0117] Similarly, by increasing the capacitor voltage of the power supply module, the same beneficial effects as reducing the output current of the power supply module can be achieved, namely, further reducing the inrush current, reducing the pressure on the corresponding ATS switch of the power supply module, and improving the redundancy of the system.

[0118] The above example only illustrates a dual-input power supply system; all control methods are equally applicable to systems with more than two input power supplies.

[0119] The power switching method for a multi-input power supply system will be described in detail below through another embodiment.

[0120] The method is used in a multi-input power supply system, which includes: a first power supply module, a second power supply module, a main input power supply, and an auxiliary input power supply; the first power supply module is electrically coupled to the main input power supply through a first switch and electrically coupled to the auxiliary input power supply through a second switch.

[0121] The second power supply module is electrically coupled to the main input power supply through a third switch and to the auxiliary input power supply through a fourth switch;

[0122] The control method includes:

[0123] When the first power supply module and the second power supply module need to switch from the auxiliary input power to the main input power, the first power supply module and the second power supply module are switched from the auxiliary input power to the main input power at different times, and the main input power includes a backup power supply.

[0124] In this embodiment, the multi-input power supply system includes a first power supply module and a second power supply module. The first and second power supply modules are connected to a main input power supply and an auxiliary input power supply, respectively, via different switches. When switching the input power between the first and second power supply modules is required, the first and second power supply modules are switched from the auxiliary input power supply to the main input power supply at different times.

[0125] Optionally, switching the first power supply module and the second power supply module from the auxiliary input power supply to the main input power supply at different times includes:

[0126] After the first power supply module switches from the auxiliary input power supply to the main input power supply, the second power supply module switches from the auxiliary input power supply to the main input power supply.

[0127] The power switching method for a multi-input power system provided in this embodiment is the same as the limitation in the above embodiment that the time interval between any two adjacent switching moments is equal to or greater than the time required for the input of the power supply module to switch from the auxiliary input power to the main input power, and will not be repeated here.

[0128] Optionally, the method further includes:

[0129] When the first power supply module or the second power supply module begins to switch from the auxiliary input power to the main input power, the output current of the first power supply module or the second power supply module is reduced.

[0130] The method for reducing the output current of the first power supply module or the second power supply module provided in this embodiment is the same as the process for reducing the output current of the power supply module described in the above embodiments, and will not be repeated here.

[0131] Optionally, the power supply module includes an AC / DC unit and a DC / DC unit, wherein the AC / DC unit and the DC / DC unit are connected via a capacitor, and the method further includes:

[0132] When the first power supply module or the second power supply module begins to switch from the auxiliary input power to the main input power, the voltage of the capacitor in the first power supply module or the second power supply module is increased.

[0133] The method for increasing the voltage of the capacitor in the first power supply module or the second power supply module provided in this embodiment is the same as the process for increasing the voltage of the capacitor in the power supply module described in the above embodiments, and will not be repeated here.

[0134] Optionally, switching the first power supply module and the second power supply module from the auxiliary input power supply to the main input power supply at different times includes:

[0135] When the first power supply module switches from the auxiliary input power supply to the main input power supply, the second switch is disconnected and the first switch is closed; when the second power supply module switches from the auxiliary input power supply to the main input power supply, the fourth switch is disconnected and the third switch is closed.

[0136] The method for opening and closing the switch provided in this embodiment is the same as the content of the control command execution for the power supply module in the above embodiment, and will not be repeated here.

[0137] Optionally, the method further includes:

[0138] The system detects whether the main input power supply can provide power normally; when the main input power supply can provide power normally, it switches the first power supply module and the second power supply module from the auxiliary input power supply to the main input power supply at different times.

[0139] In this embodiment, the process of detecting whether the main input power supply can provide power normally is the same as the process of detecting whether the main input power supply can provide power normally in the above embodiment, and will not be described again here.

[0140] Optionally, the backup power source is a diesel generator.

[0141] The limitation on the number of power supply modules that switch to the main input power at the same time provided in this embodiment is the same as the limitation on the number of power supply modules that switch to the main input power at the same time in the above embodiment, and will not be repeated here.

[0142] Figure 7 This is a schematic diagram of a multi-input power supply system provided in an embodiment of the present invention. The system includes: a first power supply module 701, a second power supply module 702, a main input power supply 703, and an auxiliary input power supply 704.

[0143] The first power supply module 701 is electrically coupled to the main input power supply 703 through a first switch S1 and electrically coupled to the auxiliary input power supply 704 through a second switch S2. The main input power supply 703 includes a backup power supply.

[0144] The second power supply module 702 is electrically coupled to the main input power supply 703 through the third switch S3, and electrically coupled to the auxiliary input power supply 704 through the fourth switch S4;

[0145] When the first power supply module 701 and the second power supply module 702 need to switch from the auxiliary input power supply 704 to the main input power supply 703, the first power supply module 701 and the second power supply module 702 are switched from the auxiliary input power supply 704 to the main input power supply 703 at different times.

[0146] Optionally, after switching the first power supply module 701 from the auxiliary input power supply 704 to the main input power supply 703, the second power supply module 702 can be switched from the auxiliary input power supply 704 to the main input power supply 703.

[0147] Optionally, during the process of switching the first power supply module 701 from the auxiliary input power supply 704 to the main input power supply 703, the output current of the first power supply module 701 is controlled to decrease; and,

[0148] During the process of switching the second power supply module 702 from the auxiliary input power supply 704 to the main input power supply 703, the output current of the second power supply module 702 is reduced.

[0149] Optionally, the power supply module includes an AC / DC unit and a DC / DC unit, and the AC / DC unit and the DC / DC unit are connected by a capacitor;

[0150] When switching the first power supply module 701 from the auxiliary input power supply 704 to the main input power supply 703, the voltage of the capacitor corresponding to the first power supply module 701 is increased; and,

[0151] When the second power supply module 702 is switched from the auxiliary input power supply 704 to the main input power supply 703, the voltage of the capacitor corresponding to the second power supply module 702 is increased.

[0152] Optionally, when the first power supply module 701 switches from the auxiliary input power supply 704 to the main input power supply 703, the second switch is disconnected and the first switch is closed; and,

[0153] When the second power supply module 702 switches from the auxiliary input power supply 704 to the main input power supply 703, the fourth switch is disconnected and the third switch is closed.

[0154] Optionally, the system further includes a detection module;

[0155] The detection module is used to detect whether the main input power supply 703 can supply power normally. When it is detected that the main input power supply 703 can supply power normally, the first power supply module 701 and the second power supply module 702 are switched from the auxiliary input power supply 704 to the main input power supply 703 at different times.

[0156] Optionally, the backup power source is a diesel generator.

[0157] In the above system, the power switching process, and / or the process of controlling the voltage increase of the capacitor of the power supply module, and / or the process of controlling the output current decrease of the power supply module can be implemented by the control module.

[0158] The aforementioned multi-input power supply system is a system corresponding to the power switching method for multi-input power supply systems in the above embodiments. It can be used to execute the technical solutions of the above method embodiments, and its implementation principle and technical effects are similar. This embodiment will not be described again here.

[0159] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A power switching method, characterized in that, The method is used to control the input power supplied to N power supply modules, including: Determine the switching strategy corresponding to each power supply module. The switching strategy is used to indicate the time when the input of each power supply module switches from the auxiliary input power supply to the main input power supply. According to the switching strategy, the input of each power supply module is switched from the auxiliary input power supply to the main input power supply at the corresponding time. The main input power supply includes a backup power supply, where N is greater than 1; The method further includes: During the process of switching the input of any power supply module from the auxiliary input power supply to the main input power supply, or before switching the input of any power supply module from the auxiliary input power supply to the main input power supply, the output current of the power supply module is reduced.

2. The method according to claim 1, characterized in that, According to the switching strategy, the input of each power supply module is switched from the auxiliary input power supply to the main input power supply at corresponding times, including: Based on the switching strategy, determine the power supply module to be switched at different times; At different times, a switching control command is sent to the corresponding power supply module. The switching control command is used to disconnect the switch between the power supply module and the auxiliary input power supply, and to close the switch between the power supply module and the main input power supply.

3. The method according to claim 1, characterized in that, Determine the switching strategy for each power supply module, including: Determine the switching sequence of each power supply module; The switching times of each power supply module are determined, wherein the time interval between any two adjacent switching times is equal to or greater than the time required for the input of the power supply module to switch from the auxiliary input power supply to the main input power supply.

4. The method according to any one of claims 1-3, characterized in that, The power supply module includes an AC / DC unit and a DC / DC unit, which are connected via a capacitor. The method further includes: When switching the input of any power supply module from the auxiliary input power supply to the main input power supply, the voltage of the capacitor corresponding to the power supply module is increased.

5. The method according to claim 1, characterized in that, The method further includes: Check whether the main input power supply can provide power normally; When it is detected that the main input power supply can supply power normally, the step of determining the switching strategy corresponding to each power module is executed.

6. The method according to claim 1, characterized in that, The backup power source is a diesel generator.

7. A power switching method for a multi-input power supply system, characterized in that, The multi-input power system includes: a first power supply module, a second power supply module, a main input power supply, and an auxiliary input power supply; The first power supply module is electrically coupled to the main input power supply through a first switch and electrically coupled to the auxiliary input power supply through a second switch; The second power supply module is electrically coupled to the main input power supply through a third switch and to the auxiliary input power supply through a fourth switch; The method includes: When the first power supply module and the second power supply module need to switch from the auxiliary input power supply to the main input power supply, the first power supply module and the second power supply module are switched from the auxiliary input power supply to the main input power supply at different times, and the main input power supply includes a backup power supply. The method further includes: When the first power supply module or the second power supply module begins to switch from the auxiliary input power supply to the main input power supply, or before switching the input of the first power supply module or the second power supply module from the auxiliary input power supply to the main input power supply, the output current of the first power supply module or the second power supply module is reduced.

8. The method according to claim 7, characterized in that, Switching the first power supply module and the second power supply module from the auxiliary input power supply to the main input power supply at different times includes: After the first power supply module switches from the auxiliary input power supply to the main input power supply, the second power supply module switches from the auxiliary input power supply to the main input power supply.

9. The method according to claim 7 or 8, characterized in that, The power supply module includes an AC / DC unit and a DC / DC unit, which are connected via a capacitor. The method further includes: When the first power supply module or the second power supply module begins to switch from the auxiliary input power to the main input power, the voltage of the capacitor in the first power supply module or the second power supply module is increased.

10. The method according to claim 7 or 8, characterized in that, Switching the first power supply module and the second power supply module from the auxiliary input power supply to the main input power supply at different times includes: When the first power supply module switches from the auxiliary input power supply to the main input power supply, the second switch is disconnected and the first switch is closed; when the second power supply module switches from the auxiliary input power supply to the main input power supply, the fourth switch is disconnected and the third switch is closed.

11. The method according to claim 7, characterized in that, The method further includes: Check whether the main input power supply can provide power normally; When it is detected that the main input power supply can supply power normally, the first power supply module and the second power supply module are switched from the auxiliary input power supply to the main input power supply at different times.

12. The method according to claim 7, characterized in that, The backup power source is a diesel generator.

13. A multi-input power supply system, characterized in that, include: First power supply module, second power supply module, main input power supply and auxiliary input power supply; The first power supply module is electrically coupled to the main input power supply through a first switch and electrically coupled to the auxiliary input power supply through a second switch. The main input power supply includes a backup power supply. The second power supply module is electrically coupled to the main input power supply through a third switch and to the auxiliary input power supply through a fourth switch. When the first power supply module and the second power supply module need to switch from the auxiliary input power to the main input power, the first power supply module and the second power supply module are switched from the auxiliary input power to the main input power at different times. During the process of switching the first power supply module from the auxiliary input power supply to the main input power supply, or before switching the first power supply module from the auxiliary input power supply to the main input power supply, the output current of the first power supply module is controlled to decrease. as well as, During the process of switching the second power supply module from the auxiliary input power supply to the main input power supply, or before switching the second power supply module from the auxiliary input power supply to the main input power supply, the output current of the second power supply module is controlled to decrease.

14. The multi-input power supply system according to claim 13, characterized in that, After switching the first power supply module from the auxiliary input power supply to the main input power supply, the second power supply module is switched from the auxiliary input power supply to the main input power supply.

15. The multi-input power supply system according to claim 13 or 14, characterized in that, The power supply module includes an AC / DC unit and a DC / DC unit, which are connected by a capacitor. When switching the first power supply module from the auxiliary input power supply to the main input power supply, the voltage of the capacitor corresponding to the first power supply module is increased; and, When switching the second power supply module from the auxiliary input power supply to the main input power supply, the voltage of the capacitor corresponding to the second power supply module is increased.

16. The multi-input power supply system according to claim 13 or 14, characterized in that, When the first power supply module switches from the auxiliary input power to the main input power, the second switch is disconnected and the first switch is closed; and... When the second power supply module switches from the auxiliary input power to the main input power, the fourth switch is disconnected and the third switch is closed.

17. The multi-input power supply system according to claim 13, characterized in that, The system also includes a detection module; The detection module is used to detect whether the main input power supply can supply power normally. When the main input power supply can supply power normally, the first power supply module and the second power supply module are switched from the auxiliary input power supply to the main input power supply at different times.

18. The power supply system according to claim 13, characterized in that, The backup power source is a diesel generator.

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