Dual-input power supply system and method

Abstract

The invention discloses a dual-input power supply system and method, and relates to the technical field of server power supply, the dual-input power supply system comprises a first distribution unit, a second distribution unit, a switching circuit, N single-input power supply units and a main controller, the first distribution unit and the second distribution unit are respectively used for connecting a first power supply and a second power supply; the switching circuit comprises N switching units, and each switching unit is connected with the first distribution unit and the second distribution unit; each single-input power supply unit is correspondingly connected with the output end of one switching unit and is also connected with a direct-current power supply busbar; the main controller is connected with the switching circuit and the N single-input power supply units, and is used for controlling the N switching units to carry out switching. The N single-input power supply units are matched with the switching circuit with the N switching units to supply power to the load, and compared with the prior art in which a plurality of double-input power supply units supporting AC and HVDC systems are adopted to supply power to the load, the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of server power supply, and particularly relates to a dual-input power supply system and method. Background Art

[0002] A server is a specific IT device that provides computing power and runs software applications in a network environment. It provides computing or application services for other client machines (such as terminal devices like personal computers, smartphones, ATM machines, etc.) in the network. Generally, a server has the ability to undertake response service requests, undertake services, and guarantee services. A server has higher CPU computing power compared to ordinary computers; the ability to run reliably for a long time; strong I / O data throughput capacity and high scalability. Servers are generally set up in data computer rooms, and the data computer rooms provide power supplies of different systems for the servers.

[0003] The power supply systems in data computer rooms are generally AC380V, AC220V, HVDC240V, and HVDC336V. To ensure the reliability of server power supply, in one solution, a dual-input power supply system uses a dual-input power supply unit that supports AC and HVDC systems to supply power to the server. When one of the power supply circuits has a problem, the dual-input power supply unit can immediately switch to the other power supply circuit to keep the output non-stop, so as to maintain the stable and reliable operation of the backend load.

[0004] However, the unit price of a dual-input power supply unit that supports AC and HVDC systems is relatively high, about 2 - 2.5 times that of a single-input power supply unit. And a dual-input power supply system requires multiple dual-input power supply units, which greatly increases the overall cost of the dual-input power supply system. Summary of the Invention

[0005] Embodiments of the present invention provide a dual-input power supply system and method to solve the technical problem in the related art that the existing dual-input power supply system uses multiple dual-input power supply units that support AC and HVDC systems to supply power to the load, resulting in a relatively high cost.

[0006] In a first aspect, a dual-input power supply system is provided, including:

[0007] A first distribution unit and a second distribution unit, which are respectively used to connect to a first power supply and a second power supply;

[0008] A switching circuit, which includes N switching units, and each of the switching units is connected to the first distribution unit and the second distribution unit;

[0009] N single-input power supply units, each of the single-input power supply units is correspondingly connected to the output end of one of the switching units and is also connected to the DC power bus bar;

[0010] A main controller, which is connected to the switching circuit and the N single-input power supply units, and is used to control the switching of the N switching units.

[0011] In some embodiments, the switching circuit further includes an electromagnetic compatibility circuit, a first conversion circuit, a second conversion circuit, and an auxiliary controller;

[0012] The electromagnetic compatibility circuit is connected to the first distribution unit and the second distribution unit, the first conversion circuit is connected to the electromagnetic compatibility circuit, the second conversion circuit, and the N switching units, the second conversion circuit is connected to the auxiliary controller and the N switching units, and the auxiliary controller is connected to the N switching units and the main controller.

[0013] In some embodiments, the electromagnetic compatibility circuit includes a first electromagnetic compatibility unit and a second electromagnetic compatibility unit, and the first electromagnetic compatibility unit and the second electromagnetic compatibility unit are respectively connected to the first distribution unit and the second distribution unit;

[0014] The first conversion circuit includes a first conversion unit and a second conversion unit, the first conversion unit and the second conversion unit are respectively connected to the first electromagnetic compatibility unit and the second electromagnetic compatibility unit, and the first conversion unit and the second conversion unit are further connected to the second conversion circuit and the N switching units.

[0015] In some embodiments, each switching unit includes a first input detection unit, a second input detection unit, a magnetic latching relay, and a relay drive unit;

[0016] The first input detection unit is connected to the first distribution unit, the second conversion circuit, and the auxiliary controller;

[0017] The second input detection unit is connected to the second distribution unit, the second conversion circuit, and the auxiliary controller;

[0018] The magnetic latching relay is connected to the first distribution unit, the second distribution unit, the relay drive unit, and the auxiliary controller;

[0019] The relay drive unit is connected to the first conversion unit, the second conversion unit, and the auxiliary controller.

[0020] In some embodiments, the electromagnetic compatibility circuit includes a selection relay and a third electromagnetic compatibility unit, the selection relay is connected to the first distribution unit and the second distribution unit, and the third electromagnetic compatibility unit is connected to the selection relay;

[0021] The first conversion circuit includes a third conversion unit, and the third conversion unit is connected to the third electromagnetic compatibility unit, the second conversion circuit, and N switching units.

[0022] In a second aspect, a dual-input power supply method is provided, including the following steps:

[0023] Obtain the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit;

[0024] If the magnitude of the output voltage of the first distribution unit or the second distribution unit is within the normal operating range of each single-input power supply unit, control N switching units to switch to the first distribution unit or the second distribution unit;

[0025] If the magnitudes of the output voltages of the first distribution unit and the second distribution unit are both within the normal operating range of each single-input power supply unit, control N switching units to switch according to the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit;

[0026] If the magnitudes of the output voltages of the first distribution unit and the second distribution unit are not within the normal operating range of each single-input power supply unit, make N single-input power supply units not work.

[0027] In some embodiments, the step of, if the magnitudes of the output voltages of the first distribution unit and the second distribution unit are both within the normal operating range of each single-input power supply unit, controlling N switching units to switch according to the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit includes:

[0028] If the types of the output voltages of the first distribution unit and the second distribution unit are both alternating current;

[0029] Judge the operating power segments of the output voltages of the first distribution unit and the second distribution unit according to the magnitudes of the output voltages of the first distribution unit and the second distribution unit, and the operating power segments include a high-power segment and a low-power end;

[0030] If the operating power segments of the output voltages of the first distribution unit and the second distribution unit are the same, control N switching units to switch to the first distribution unit;

[0031] If the output voltage of the first distribution unit / second distribution unit is in the high-power segment and the output voltage of the second distribution unit / first distribution unit is in the low-power segment, control N switching units to switch to the first distribution unit / second distribution unit.

[0032] In some embodiments, when the magnitudes of the output voltages of the first distribution unit and the second distribution unit are both within the normal operating range of each single-input power supply unit, controlling the N switching units to switch according to the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit further includes:

[0033] If the types of the output voltages of the first distribution unit and the second distribution unit are both direct current;

[0034] Control the N switching units to switch to the first distribution unit.

[0035] In some embodiments, when the magnitudes of the output voltages of the first distribution unit and the second distribution unit are both within the normal operating range of each single-input power supply unit, controlling the N switching units to switch according to the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit further includes:

[0036] If the types of the output voltages of the first distribution unit and the second distribution unit are different;

[0037] If the type of the output voltage of the first distribution unit / second distribution unit is alternating current, determine the operating power segment of the output voltage of the first distribution unit / second distribution unit, and the operating power segment includes a high-power segment and a low-power end;

[0038] If the output voltage of the first distribution unit / second distribution unit is in the high-power segment, control the N switching units to switch to the first distribution unit / second distribution unit; if the output voltage of the first distribution unit / second distribution unit is in the low-power segment, control the N switching units to switch to the second distribution unit / first distribution unit.

[0039] In some embodiments, after obtaining the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit, it further includes:

[0040] If the magnitudes of the output voltages of the first distribution unit and the second distribution unit are both within the normal operating range of each single-input power supply unit, determine whether the voltage of the DC power bus bar is not less than a preset output voltage threshold;

[0041] If so, control the N switching units to switch according to the active switching instruction; if not, do not execute the active switching instruction.

[0042] The beneficial effects brought by the technical solution provided by the present invention include:

[0043] An embodiment of the present invention provides a dual-input power supply system and method. The dual-input power supply system is provided with N single-input power supply units and a switching circuit including N switching units, that is, N single-input power supply units are used in cooperation with a switching circuit having N switching units to supply power to a load. Compared with the prior art in which multiple dual-input power supply units supporting AC and HVDC systems are used to supply power to a load, the cost of the dual-input power supply system is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 Schematic diagram of a dual-input power supply system provided by an embodiment of the present invention;

[0046] Figure 2 The first schematic diagram of the switching circuit provided by an embodiment of the present invention;

[0047] Figure 3 The second schematic diagram of the switching circuit provided by an embodiment of the present invention;

[0048] Figure 4 The third schematic diagram of the switching circuit provided by an embodiment of the present invention;

[0049] Figure 5 The fourth schematic diagram of the switching circuit provided by an embodiment of the present invention;

[0050] Figure 6 A flowchart of a dual-input power supply method provided by an embodiment of the present invention;

[0051] Figure 7 For the implementation provided by an embodiment of the present invention Figure 6 The first flowchart of step S30;

[0052] Figure 8 For the implementation provided by an embodiment of the present invention Figure 6 The second flowchart of step S30;

[0053] Figure 9 For the implementation provided by an embodiment of the present invention Figure 6 The third flowchart of step S30;

[0054] Figure 10 Another flowchart of a dual-input power supply method provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, rather than all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0056] The embodiments of the present invention provide a dual-input power supply system, which can solve the technical problem that the existing dual-input power supply system uses multiple dual-input power supply units supporting AC and HVDC systems to supply power to a load, resulting in a relatively high cost.

[0057] See Figure 1 As shown, the embodiments of the present invention provide a dual-input power supply system, including: a first distribution unit, a second distribution unit, a switching circuit, and N single-input power supply units.

[0058] The first distribution unit and the second distribution unit are respectively used to connect to a first power supply and a second power supply. Among them, the first power supply and the second power supply can be HVDC power supplies or AC power supplies, such as AC380V, AC220V, HVDC240V, HVDC336V, etc.

[0059] The switching circuit includes N switching units, each of which is connected to the first distribution unit and the second distribution unit. The first distribution unit and the second distribution unit can distribute the first power supply or the second power supply to the N switching units.

[0060] Each single-input power supply unit is correspondingly connected to the output end of a switching unit and is also connected to the DC power bus bar. Each single-input power supply unit supports power supply with voltages such as AC220V, HVDC240V, and HVDC336V, and can convert it into stable direct current required by the load and supply it to the DC power bus bar. The load takes power from the DC output bus bar. Optionally, the single-input power supply unit can be selected to have a standby output mode, that is, after the single-input power supply unit turns off the main output, the standby output mode still has output.

[0061] The main controller is connected to the switching circuit and the N single-input power supply units. The main controller is used to control the N switching units to switch, so that the corresponding N single-input power supply units receive the first power supply distributed by the first distribution unit or the second power supply distributed by the second distribution unit.

[0062] An embodiment of the present invention provides a dual-input power supply system, which is provided with N single-input power supply units and a switching circuit including N switching units. That is, N single-input power supply units are used in cooperation with a switching circuit having N switching units to supply power to a load. Compared with the prior art in which multiple dual-input power supply units supporting AC and HVDC systems are used to supply power to a load, the cost of the dual-input power supply system is reduced.

[0063] As an optional implementation manner, in an embodiment of the invention, refer to Figure 1 and Figure 2 As shown, the switching circuit further includes an electromagnetic compatibility circuit, a first conversion circuit, a second conversion circuit, and an auxiliary controller.

[0064] The electromagnetic compatibility circuit is connected to the first distribution unit and the second distribution unit, and the electromagnetic compatibility circuit is used to process the voltages output by the first distribution unit and the second distribution unit and then output them to the first conversion circuit.

[0065] The first conversion circuit is connected to the electromagnetic compatibility circuit, the second conversion circuit, and N switching units. The first conversion circuit is used to convert the voltage from the electromagnetic compatibility circuit into direct current and then output it to the second conversion circuit and N switching units. Among them, the first conversion circuit has the functions of AC-to-DC conversion and DC-to-DC conversion. The second conversion circuit is connected to the auxiliary controller and N switching units. The second conversion circuit is used to convert the direct current from the first conversion circuit into direct current of other magnitudes to supply power to the auxiliary controller and N switching units.

[0066] The auxiliary controller is connected to N switching units and the main controller. The auxiliary controller exchanges data with the main controller, and the auxiliary controller is further used to control N switching units to switch, so that the corresponding N single-input power supply units receive the first power supply distributed by the first distribution unit or the second power supply distributed by the second distribution unit.

[0067] The N switching units in the embodiment of the present invention share the electromagnetic compatibility circuit, the first conversion circuit, the second conversion circuit, and the auxiliary controller, and the circuit structure is simple and occupies little space, further reducing the cost.

[0068] As an optional implementation manner, in an embodiment of the invention, refer to Figure 2 As shown, the electromagnetic compatibility circuit includes a first electromagnetic compatibility unit and a second electromagnetic compatibility unit, and the first electromagnetic compatibility unit and the second electromagnetic compatibility unit are respectively connected to the first distribution unit and the second distribution unit.

[0069] The first conversion circuit includes a first conversion unit and a second conversion unit. The first conversion unit and the second conversion unit are respectively connected to the first electromagnetic compatibility unit and the second electromagnetic compatibility unit. The first conversion unit and the second conversion unit are also connected to the second conversion circuit and N switching units.

[0070] The first conversion unit and the second conversion unit can convert the AC or HVDC voltage of the first power supply and the second power supply into a DC voltage, such as 12V voltage. One is to supply power to the switching unit; the other is to further convert the DC power into a chip operating voltage through the second conversion circuit, such as converting 12V voltage into 5V voltage to supply power to the auxiliary controller and the switching unit. To ensure that the first conversion unit and the second conversion unit do not supply power to each other in the reverse direction, anti-backflow diodes are respectively arranged at the back ends of the first conversion unit and the second conversion unit. At the same time, to protect the first conversion unit and the second conversion unit, a first electromagnetic compatibility unit and a second electromagnetic compatibility unit are respectively designed at their front ends to protect the first conversion unit and the second conversion unit from interference and damage.

[0071] As an optional implementation manner, in an invention embodiment, refer to Figure 2 As shown, each switching unit includes a first input detection unit, a second input detection unit, a magnetic latching relay, and a relay driving unit.

[0072] The first input detection unit is connected to the first distribution unit, the second conversion circuit, and the auxiliary controller. The second input detection unit is connected to the second distribution unit, the second conversion circuit, and the auxiliary controller.

[0073] The magnetic latching relay is connected to the first distribution unit, the second distribution unit, the relay driving unit, and the auxiliary controller. The relay driving unit is connected to the first conversion unit, the second conversion unit, and the auxiliary controller.

[0074] Among them, the first input detection unit can detect the power supply type, voltage, and current of the first distribution unit, and transmit the detected information to the auxiliary controller; the second input detection unit can detect the power supply type, voltage, and current of the second distribution unit, and transmit the detected information to the auxiliary controller. The magnetic latching relay is connected to the first distribution unit and the second distribution unit, and is controlled by the relay driving unit. It can switch between the first distribution unit and the second distribution unit and maintain the corresponding state, so as to always transmit one of the power supply sources to the single-input power supply unit. At the same time, the magnetic latching relay is connected to the auxiliary controller, and the switching state of the magnetic latching relay can be fed back to the auxiliary controller. The relay driving unit can receive the control signal of the auxiliary controller and control the operation of the magnetic latching relay.

[0075] In addition, referring to Figure 3 As shown, the first input detection unit and the second input detection unit can also be connected to the first conversion unit and the second conversion unit to obtain power from the first conversion unit and the second conversion unit. This can reduce more power losses during voltage conversion by the second conversion circuit. At the same time, the second conversion circuit is only used to supply power to the auxiliary controller, and a smaller specification can be selected for the second conversion circuit.

[0076] As an alternative embodiment, in an inventive embodiment, referring to Figure 4 As shown, the electromagnetic compatibility circuit includes a selection relay and a third electromagnetic compatibility unit. The selection relay is connected to the first distribution unit and the second distribution unit, and the third electromagnetic compatibility unit is connected to the selection relay.

[0077] The first conversion circuit includes a third conversion unit. The third conversion unit is connected to the third electromagnetic compatibility unit, the second conversion circuit, and N switching units.

[0078] Figure 2 and Figure 3 The first electromagnetic compatibility unit, the second electromagnetic compatibility unit, the first conversion unit, and the second conversion unit shown are redundant in design. When one path is working, the other path is in an idle state. To avoid wasting hardware resources and reduce the redundant design of the circuit. Referring to Figure 4 As shown, one path can be cancelled, and a selection relay is provided at the front end. The selection relay includes a pair of normally open contacts and a pair of normally closed contacts with mutually exclusive logic, and is used to obtain power from the first distribution unit and the second distribution unit.

[0079] The coil of the selection relay is connected to the first distribution unit, that is, the first distribution unit drives the relay to act. In addition, the selection relay includes a pair of normally open contacts 1 and 2 and a pair of normally closed contacts 3 and 4 with mutually exclusive logic. The normally open contacts 1 and 2 are respectively connected to the first distribution unit and the third electromagnetic compatibility unit, and the normally closed contacts 3 and 4 are respectively connected to the second distribution unit and the third electromagnetic compatibility unit. When the first distribution unit has power and the voltage is within the driving control voltage range of the selection relay coil, the coil in the selection relay controls the normally open contacts 1 and 2 to close, and the normally closed contacts 3 and 4 to open. At this time, the first distribution unit is connected to the third electromagnetic compatibility unit to supply power to the third conversion unit; when the first distribution unit either has power but the voltage range is lower than the coil operating voltage range of the selection relay, the coil of the selection relay controls the normally open contacts 1 and 2 to open, and the normally closed contacts 3 and 4 to close. At this time, the second distribution unit is connected to the third electromagnetic compatibility unit to supply power to the third conversion unit.

[0080] In addition, referring to Figure 5As shown, another connection method of the selection relay with the first distribution unit and the second distribution unit is selected, and preferably the second distribution unit is powered.

[0081] See Figure 6 As shown, an embodiment of the present invention also provides a dual-input power supply method, including the following steps:

[0082] Step S10, obtain the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit.

[0083] Step S20, if the magnitude of the output voltage of the first distribution unit or the second distribution unit is within the normal operating range of each single-input power supply unit, control the N switching units to switch to the first distribution unit or the second distribution unit.

[0084] Step S30, if the magnitudes of the output voltages of both the first distribution unit and the second distribution unit are within the normal operating range of each single-input power supply unit, control the N switching units to switch according to the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit.

[0085] Step S40, if the magnitudes of the output voltages of both the first distribution unit and the second distribution unit are not within the normal operating range of each single-input power supply unit, make the N single-input power supply units not work.

[0086] In the dual-input power supply method in the embodiment of the present invention, on the one hand, N single-input power supply units are used in cooperation with a switching circuit having N switching units to supply power to the load. Compared with the prior art in which multiple dual-input power supply units supporting AC and HVDC systems are used to supply power to the load, the cost is reduced; on the other hand, according to the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit, automatic judgment is made and the N switching units are controlled to switch, meeting the self-control requirements of the equipment, and the control method is simple.

[0087] As an optional implementation manner, in an embodiment of the invention, see Figure 7 As shown, when the magnitudes of the output voltages of both the first distribution unit and the second distribution unit are within the normal operating range of each single-input power supply unit, controlling the N switching units to switch according to the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit includes:

[0088] Step S301, if the types of the output voltages of both the first distribution unit and the second distribution unit are alternating current.

[0089] Step S302, judge the working power section of the output voltages of the first distribution unit and the second distribution unit according to the magnitudes of the output voltages of the first distribution unit and the second distribution unit, and the working power section includes a high power section and a low power end.

[0090] Step S303, if the operating power segments of the output voltages of the first distribution unit and the second distribution unit are the same, control the N switching units to switch to the first distribution unit;

[0091] Step S304, if the output voltage of the first distribution unit / second distribution unit is in the high power segment and the output voltage of the second distribution unit / first distribution unit is in the low power segment, control the N switching units to switch to the first distribution unit / second distribution unit.

[0092] Specifically, under AC input conditions, affected by the AC input voltage, the output power performance of the single-input power supply unit is different in different AC input ranges. When the AC voltage ≥ the first voltage U1, the single-input power supply unit can output at full load. At this time, the output voltage of the distribution unit is defined as the high power segment; when the AC voltage < U1 but the AC voltage ≥ the second voltage U2, the single-input power supply unit cannot output at full load. At this time, the output voltage of the distribution unit is the low power segment. If both the first distribution unit and the second distribution unit are in the high power segment or both are in the low power segment, there is no difference in the output voltages of the first distribution unit and the second distribution unit. Logically, the first distribution unit (i.e., the first power supply) can be default selected; if one is in the high power segment and the other is in the low power segment, to ensure power output, select the output voltage (power supply) of the distribution unit in the high power segment. Additionally, when the AC voltage < U1 or the AC voltage > the first limit voltage U O 1, undervoltage or overvoltage protection can be implemented, and the single-input power supply unit is protected without output. Among them, the AC voltage values U1, U2, and U O 1 can be set according to the actual situation.

[0093] As an optional implementation manner, in an embodiment of the invention, refer to Figure 8 As shown, if the magnitudes of the output voltages of the first distribution unit and the second distribution unit are both within the normal operating range of each single-input power supply unit, control the N switching units to switch according to the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit, and further include:

[0094] Step S305, if the types of the output voltages of the first distribution unit and the second distribution unit are both direct current;

[0095] Step S306, control the N switching units to switch to the first distribution unit.

[0096] Under this condition, both the first distribution unit and the second distribution unit can be used, and the first distribution unit is default selected in the control logic. Under DC input conditions, when the DC voltage ≥ the third voltage U3 and the DC voltage < the second limit voltage U O 2, the single-input power supply unit can output at full load. When the DC voltage < U3 or > U OWhen it is 2 o'clock, undervoltage or overvoltage protection can be implemented, and the single-input power supply unit protection has no output. Among them, the DC voltage value U3 and U O 2 can be set according to the actual situation.

[0097] As an optional implementation manner, in an invention embodiment, see Figure 9 As shown, if the magnitudes of the output voltages of the first distribution unit and the second distribution unit are both within the normal operating range of each single-input power supply unit, controlling the N switching units to switch according to the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit further includes:

[0098] Step S307, if the types of the output voltages of the first distribution unit and the second distribution unit are different. Among them, one output voltage is alternating current, and the other output voltage is direct current.

[0099] Step S308, if the type of the output voltage of the first distribution unit / second distribution unit is alternating current, judging the operating power section of the output voltage of the first distribution unit / second distribution unit, and the operating power section includes a high-power section and a low-power end;

[0100] Step S309, if the output voltage of the first distribution unit / second distribution unit is in the high-power section, controlling the N switching units to switch to the first distribution unit / second distribution unit; if the output voltage of the first distribution unit / second distribution unit is in the low-power section, controlling the N switching units to switch to the second distribution unit / first distribution unit.

[0101] For example, if the type of the output voltage of the first distribution unit is alternating current and it is judged that the operating power section of the first distribution unit is the high-power section, controlling the N switching units to switch to the first distribution unit. If the type of the output voltage of the first distribution unit is alternating current, but it is judged that the operating power section of the first distribution unit is the low-power section, controlling the N switching units to switch to the second distribution unit. That is, when the types of the output voltages of the first distribution unit and the second distribution unit are different, the distribution unit corresponding to the alternating current in the high-power section is preferably selected.

[0102] As an optional implementation manner, in an invention embodiment, see Figure 10 As shown, after obtaining the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit, it further includes:

[0103] Step S50, if the magnitudes of the output voltages of the first distribution unit and the second distribution unit are both within the normal operating range of each single-input power supply unit, judging whether the voltage of the DC power busbar is not less than a preset output voltage threshold;

[0104] Step S60, if so, controlling the N switching units to switch according to the active switching instruction; if not, not executing the active switching instruction.

[0105] After actively switching N switching units, the single-input power supply unit synchronously switches to the corresponding first power supply or second power supply for power supply. During the switching process, for a very short period of time, since there is no input to the system, the output capacitor in the single-input power supply unit is used to maintain power-off, and at this time the output voltage will gradually decrease. However, due to the preset output voltage threshold U OUT , it will not drop outside the operating voltage range of the load. After the switching is completed, the system resumes power supply input, and the single-input power supply unit resumes normal power supply.

[0106] During the maintenance of the power supply or when the two power supplies are the same, by default, the first power supply supplies power for a long time. Through active switching, the second power supply can be made to supply power, so that the two power supplies can be used alternately to extend their service life.

[0107] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. Unless otherwise clearly specified and defined, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0108] It should be noted that in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0109] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features of the invention herein.

Claims

1. A dual-input power supply system, characterized in that, Comprising: A first distribution unit and a second distribution unit, which are respectively used to connect to a first power supply and a second power supply; A switching circuit, which includes N switching units, and each of the switching units is connected to the first distribution unit and the second distribution unit; N single-input power supply units, each of the single-input power supply units is correspondingly connected to the output end of one of the switching units and is also connected to a DC power bus bar; A main controller, which is connected to the switching circuit and the N single-input power supply units, and is used to control the switching of the N switching units.

2. The dual-input power supply system according to claim 1, wherein: The switching circuit further includes an electromagnetic compatibility circuit, a first conversion circuit, a second conversion circuit and an auxiliary controller; The electromagnetic compatibility circuit is connected to the first distribution unit and the second distribution unit, the first conversion circuit is connected to the electromagnetic compatibility circuit, the second conversion circuit and the N switching units, the second conversion circuit is connected to the auxiliary controller and the N switching units, and the auxiliary controller is connected to the N switching units and the main controller.

3. The dual-input power supply system according to claim 2, wherein: The electromagnetic compatibility circuit includes a first electromagnetic compatibility unit and a second electromagnetic compatibility unit, and the first electromagnetic compatibility unit and the second electromagnetic compatibility unit are respectively connected to the first distribution unit and the second distribution unit; The first conversion circuit includes a first conversion unit and a second conversion unit, the first conversion unit and the second conversion unit are respectively connected to the first electromagnetic compatibility unit and the second electromagnetic compatibility unit, and the first conversion unit and the second conversion unit are also connected to the second conversion circuit and the N switching units.

4. The dual-input power supply system according to claim 3, wherein: Each of the switching units includes a first input detection unit, a second input detection unit, a magnetic latching relay and a relay driving unit; The first input detection unit is connected to the first distribution unit, the second conversion circuit and the auxiliary controller; The second input detection unit is connected to the second distribution unit, the second conversion circuit and the auxiliary controller; The magnetic latching relay is connected to the first distribution unit, the second distribution unit, the relay driving unit and the auxiliary controller; The relay driving unit is connected to the first conversion unit, the second conversion unit and the auxiliary controller.

5. The dual-input power supply system according to claim 2, wherein: The electromagnetic compatibility circuit includes a selection relay and a third electromagnetic compatibility unit, the selection relay is connected to the first distribution unit and the second distribution unit, and the third electromagnetic compatibility unit is connected to the selection relay; The first conversion circuit includes a third conversion unit, and the third conversion unit is connected to the third electromagnetic compatibility unit, the second conversion circuit and the N switching units.

6. A dual-input power supply method, based on the dual-input power supply system described in claim 1, characterized in that, Including the following steps: Obtain the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit; If the magnitude of the output voltage of the first distribution unit or the second distribution unit is within the normal operating range of each single-input power supply unit, control the N switching units to switch to the first distribution unit or the second distribution unit; If the magnitudes of the output voltages of both the first distribution unit and the second distribution unit are within the normal operating range of each single-input power supply unit, control the N switching units to switch according to the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit; If the magnitudes of the output voltages of both the first distribution unit and the second distribution unit are not within the normal operating range of each single-input power supply unit, make the N single-input power supply units not work.

7. The dual-input power supply method according to claim 6, wherein, The step of, if the magnitudes of the output voltages of both the first distribution unit and the second distribution unit are within the normal operating range of each single-input power supply unit, controlling the N switching units to switch according to the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit, includes: If the types of the output voltages of both the first distribution unit and the second distribution unit are alternating current; Judge the operating power segments of the output voltages of the first distribution unit and the second distribution unit according to the magnitudes of the output voltages of the first distribution unit and the second distribution unit, and the operating power segments include a high-power segment and a low-power segment; If the operating power segments of the output voltages of the first distribution unit and the second distribution unit are the same, control the N switching units to switch to the first distribution unit; If the output voltage of the first distribution unit / second distribution unit is in the high-power segment and the output voltage of the second distribution unit / first distribution unit is in the low-power segment, control the N switching units to switch to the first distribution unit / second distribution unit.

8. The dual-input power supply method according to claim 6, wherein The step of, if the magnitudes of the output voltages of both the first distribution unit and the second distribution unit are within the normal operating range of each single-input power supply unit, controlling the N switching units to switch according to the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit, further includes: If the types of the output voltages of both the first distribution unit and the second distribution unit are direct current; Control the N switching units to switch to the first distribution unit.

9. The dual-input power supply method according to claim 6, wherein The step of, if the magnitudes of the output voltages of both the first distribution unit and the second distribution unit are within the normal operating range of each single-input power supply unit, controlling the N switching units to switch according to the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit, further includes: If the types of the output voltages of the first distribution unit and the second distribution unit are different; If the type of the output voltage of the first distribution unit / second distribution unit is alternating current, judge the operating power segment of the output voltage of the first distribution unit / second distribution unit, and the operating power segment includes a high-power segment and a low-power segment; If the output voltage of the first distribution unit / second distribution unit is in the high-power segment, control the N switching units to switch to the first distribution unit / second distribution unit; if the output voltage of the first distribution unit / second distribution unit is in the low-power segment, control the N switching units to switch to the second distribution unit / first distribution unit.

10. The dual-input power supply method according to claim 6, characterized in that, After obtaining the magnitudes and types of the output voltages of the first distribution unit and the second distribution unit, it further includes: If the magnitudes of the output voltages of the first distribution unit and the second distribution unit are both within the normal operating range of each single-input power supply unit, determine whether the voltage of the DC power busbar is not less than a preset output voltage threshold; If so, control N switching units to perform switching according to the active switching instruction; if not, do not execute the active switching instruction.

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