Switching device and uninterruptible power supply

Abstract

The utility model discloses a switching device and an uninterruptible power supply. The switching device comprises a first switching circuit and a second switching circuit, the first end of the first switching circuit is connected with the output end of the uninterruptible power supply, the second end of the first switching circuit is connected with a load, the first end of the second switching circuit is connected with a power supply, and the second end of the second switching circuit is connected with the load; and under the condition that the uninterruptible power supply is disconnected, the first switching circuit is disconnected, and the second switching circuit is closed, so that the power supply supplies power to the load. Therefore, under the condition that a power grid or other power supply equipment connected with the load is disconnected and cannot supply power to the load, the uninterruptible power supply can supply power to the load so as to ensure that important equipment can normally operate without shutdown during the power supply interruption period; and on the other hand, when the uninterruptible power supply is disconnected, the power supply can be connected into the circuit through the switching action of the first switching circuit and the second switching circuit to supply power to the load, so that the reliability and the stability of important equipment are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, in particular to a switching device and an uninterruptible power supply. BACKGROUND

[0002] An uninterruptible power system (UPS) is a power supply device, which is mainly used to provide power to important equipment immediately in the case that the power grid or other power supply device connected to the load is disconnected and cannot supply power to the load, so as to ensure that the important equipment can operate normally without shutdown during power interruption.

[0003] However, the UPS may be disconnected, which leads to shutdown of the important equipment due to power failure and reduces the reliability and stability of the important equipment. CONTENT OF THE INVENTION

[0004] In view of the above problems, the present application provides a switching device and an uninterruptible power supply, which aims to improve the reliability and stability of important equipment.

[0005] The embodiments of the present application disclose the following technical solutions:

[0006] In a first aspect, the embodiments of the present application provide a switching device, comprising: a first switching circuit and a second switching circuit; a first end of the first switching circuit is used for connecting an output end of an uninterruptible power supply, a second end of the first switching circuit is used for connecting a load, a first end of the second switching circuit is used for connecting a power supply, and a second end of the second switching circuit is used for connecting the load;

[0007] In the case that the uninterruptible power supply is closed, the first switching circuit is closed and the second switching circuit is disconnected, so as to supply power to the load by the uninterruptible power supply;

[0008] In the case that the uninterruptible power supply is disconnected, the first switching circuit is disconnected and the second switching circuit is closed, so as to supply power to the load by the power supply.

[0009] In combination with the first aspect, in a possible implementation manner, the switching device further comprises: a current limiting circuit; a first end of the current limiting circuit is connected to the second end of the first switching circuit and the second end of the second switching circuit, and a second end of the current limiting circuit is used for connecting the load.

[0010] In combination with the first aspect, in a possible implementation manner, the switching device further comprises a switching contactor, the switching contactor comprises a normally open contact and a normally closed contact, the normally open contact is configured as the first switching circuit, and the normally closed contact is configured as the second switching circuit.

[0011] In the case that the uninterruptible power supply is closed, the normally open contact is closed and the normally closed contact is disconnected;

[0012] In the case that the uninterruptible power supply is closed, the normally open contact is closed, and the normally closed contact is opened.

[0013] With reference to the first aspect, in a possible implementation manner, the first switch circuit is a normally open switch, the second switch circuit is a normally closed switch, and the switch device further includes: a driving circuit; a first end of the driving circuit is connected with an output end of the uninterruptible power supply, and a second end of the driving circuit is connected with the normally open switch and the normally closed switch.

[0014] In the case that the uninterruptible power supply is closed, the normally open switch is closed, and the normally closed switch is opened.

[0015] In the case that the uninterruptible power supply is opened, the normally open switch is opened, and the normally closed switch is closed.

[0016] With reference to the first aspect, in a possible implementation manner, the switch device further includes: a feedback contact; a first end of the feedback contact is connected with the power supply; and a second end of the feedback contact is connected with the controller.

[0017] With reference to the first aspect, in a possible implementation manner, the feedback contact is a normally open contact.

[0018] In the case that the uninterruptible power supply is closed, the normally open contact is closed.

[0019] In the case that the uninterruptible power supply is opened, the normally open contact is opened.

[0020] With reference to the first aspect, in a possible implementation manner, the feedback contact is a normally closed contact.

[0021] In the case that the uninterruptible power supply is closed, the normally closed contact is opened.

[0022] In the case that the uninterruptible power supply is opened, the normally closed contact is closed.

[0023] With reference to the first aspect, in a possible implementation manner, the power supply is any one of a power grid, a super capacitor or a second uninterruptible power supply.

[0024] With reference to the first aspect, in a possible implementation manner, in the case that the uninterruptible power supply supplies power, the first switch circuit is closed, and the second switch circuit is opened, so that the uninterruptible power supply supplies power to the load.

[0025] In a second aspect, an embodiment of the present application provides an uninterruptible power supply, which includes a power supply body and a switch device as in the first aspect; the power supply body is connected with a first end of a first switch circuit of the switch device.

[0026] The switching device provided by the embodiment of the present application comprises a first switching circuit and a second switching circuit; the first end of the first switching circuit is connected to the output end of the uninterruptible power supply, the second end of the first switching circuit is connected to the load, the first end of the second switching circuit is connected to the power supply, and the second end of the second switching circuit is connected to the load; in the case that the uninterruptible power supply is closed, the first switching circuit is closed, and the second switching circuit is disconnected, so that the uninterruptible power supply supplies power to the load; in the case that the uninterruptible power supply is disconnected, the first switching circuit is disconnected, and the second switching circuit is closed, so that the power supply supplies power to the load.

[0027] In this way, in the case that the power grid or other power supply device connected to the load is disconnected and cannot supply power to the load, the uninterruptible power supply can supply power to the load, so as to ensure that the important equipment can normally operate without shutdown during power interruption; on the other hand, in the case that the uninterruptible power supply is disconnected, the power supply can be connected to the circuit through the switching action of the first switching circuit and the second switching circuit, so as to supply power to the load, and ensure the reliability and stability of the important equipment. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0029] Figure 1 A schematic diagram of an uninterruptible power supply provided by the related art;

[0030] Figure 2 A first structural schematic diagram of a switching device provided by the embodiment of the present application;

[0031] Figure 3 A second structural schematic diagram of a switching device provided by the embodiment of the present application;

[0032] Figure 4 A third structural schematic diagram of a switching device provided by the embodiment of the present application;

[0033] Figure 5 A fourth structural schematic diagram of a switching device provided by the embodiment of the present application;

[0034] Figure 6 A fifth structural schematic diagram of a switching device provided by the embodiment of the present application;

[0035] Figure 7 A sixth structural schematic diagram of a switching device provided by the embodiment of the present application;

[0036] Figure 8 A structure diagram of an uninterruptible power supply provided by an embodiment of the present application is shown. DETAILED DESCRIPTION

[0037] For those skilled in the art to better understand the present application, see Figure 1 The figure is a structure diagram of an uninterruptible power supply provided by an embodiment of the present application.

[0038] In combination with Figure 1 As shown in the figure, the uninterruptible power supply 10 can include a rectifier-inverter unit 11, a control unit 12, a charging circuit 13 and a DC-DC conversion circuit 14; a first end of the rectifier-inverter unit 11 is connected to a power grid through a switch S1, a second end of the rectifier-inverter unit 11 is connected to a load, a power supply end of the control unit 12 is connected to a first end of a battery, a first end of the charging circuit 13 is connected to the first end of the rectifier-inverter unit 11, a second end of the charging circuit 13 is connected to the first end of the battery, a first end of the DC-DC conversion circuit 14 is connected to a second end of the battery, and a second end of the DC-DC conversion circuit 14 is connected to a third end of the rectifier-inverter unit.

[0039] In the case of closing the switch S1, the power grid can supply power to the load through the uninterruptible power supply 10; when the switch S1 is opened, the power grid is disconnected from the uninterruptible power supply 10, and thus cannot supply power to the load, at this time the control unit 12 in the uninterruptible power supply 10 can take power from the battery and be used to control the bypass contactor K1 and the rectifier-inverter unit 11 to supply power to the load. However, when the battery fails to supply power to the control unit 12, the control unit 12 will lose power, and thus the uninterruptible power supply will lose power.

[0040] When the uninterruptible power supply loses power, the load in the rear stage will lose power, assuming that the load is a converter, the converter is used to control the fan, and when the converter loses power, the fan cannot be controlled, and thus the fan may lose control.

[0041] In order to improve the stability and reliability of important equipment, the present application provides a switching device and an uninterruptible power supply, the switching device includes a first switching circuit and a second switching circuit; a first end of the first switching circuit is connected to an output end of the uninterruptible power supply, a second end of the first switching circuit is connected to a load, a first end of the second switching circuit is connected to a power supply, and a second end of the second switching circuit is connected to the load; in the case of disconnecting the uninterruptible power supply, the first switching circuit is opened, and the second switching circuit is closed, so as to make the power supply supply power to the load.

[0042] Thus, in the case that the power grid or other power supply device to which the load is connected is disconnected and cannot supply power to the load, the uninterruptible power supply can supply power to the load to ensure that important equipment can operate normally without shutdown during power interruption. On the other hand, when the uninterruptible power supply is disconnected, the first switch circuit and the second switch circuit can be switched to connect the power supply to the circuit to supply power to the load, thereby ensuring the reliability and stability of the important equipment.

[0043] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] Referring to Figure 2 , the figure is a structural schematic diagram of a switch device provided by an embodiment of the present application.

[0045] As shown in Figure 2 , the switch device 20 provided by an embodiment of the present application can include a first switch circuit 21 and a second switch circuit 22. The first end of the first switch circuit 21 is connected to the output end of an uninterruptible power supply, the second end of the first switch circuit 21 is connected to a load, the first end of the second switch circuit 22 is connected to a power supply, and the second end of the second switch circuit 22 is connected to the load.

[0046] Switch circuit means a circuit with closing and opening functions, such as a normally open contact, a normally closed contact, a normally open switch, a normally closed switch, and the like.

[0047] Normally open (NO) means that the circuit is in an open state when not subjected to external force (such as the application of voltage, current, or the actuation of a switch), that is, the circuit is disconnected and no current passes through.

[0048] Normally closed (NC) means that the circuit is in a closed state when not subjected to external force (such as the application of voltage, current, or the actuation of a switch), that is, the circuit is connected and current can pass freely.

[0049] It should be noted that, in the embodiments of the present application, the first switch circuit and the second switch circuit are interlocking circuits, and further, when the first switch circuit and the second switch circuit are switch devices, the switch represented by the first switch circuit and the switch represented by the second switch circuit are interlocking switches.

[0050] Interlocking is a control form that ensures that two switches (or switch circuits) cannot be closed at the same time or cannot be powered at the same time by restricting each other in the circuit.

[0051] As an example, in the case of condition 1, the first switch circuit is closed, and the second switch circuit is open; in the case of condition 2, the first switch circuit is open, and the second switch circuit is closed. That is, the first switch circuit and the second switch circuit are in different closed states under the same condition.

[0052] In the embodiments of the present application, the load means an electrical device connected to the rear stage of the switching device, such as a converter, an inverter, and the like.

[0053] An uninterruptible power supply (UPS) is an electronic device that contains an energy storage device and can provide uninterrupted power supply for some devices that have higher requirements for power stability.

[0054] It should be noted that the UPS can also control the voltage to be stable when the load is a converter entering high-low pass, so that the converter can pass through the high-low pass. The high-low pass generally refers to the ability of the converter to maintain normal operation and pass through the abnormal state when the grid voltage is abnormal (such as too high or too low).

[0055] In addition, the UPS can also provide backup power when performing static debugging of the circuit. Static debugging is a series of tests and adjustments performed by the converter before it is put into use to ensure its performance and safety. During the static debugging process, if the mains power is suddenly interrupted, the debugging work may be forced to stop without the UPS as a backup power supply, and even the debugging data may be lost. With the UPS, the debugging work can continue even in the case of power interruption, ensuring the continuity and integrity of the debugging.

[0056] In addition, the UPS can also maintain the power supply of the control system in the fault state of the converter, so as to ensure that the fault recording system can work normally and record detailed data at the moment of the fault, so as to facilitate subsequent use of the detailed data to quickly locate the fault reason, develop a repair scheme, and the like.

[0057] The working principle of the uninterruptible power supply is mainly based on the switching and transformation of power between the mains and the battery. For example, when the mains input is normal, the UPS supplies the load with stabilized mains, and charges the internal battery at the same time. When the mains is interrupted (such as an accident power failure), the UPS immediately converts the direct current power of the internal battery into alternating current (such as 220V) through an inverter switching method to continue to supply the load, so as to ensure that the load maintains normal work and protects the software and hardware from being damaged.

[0058] The power supply means a power supply for providing power, such as a power grid, a super capacitor, a UPS, and the like, which is not specifically limited here.

[0059] Mains electricity is the main power supply in cities, with a voltage of 220 volts (110 volts in some areas), a frequency of 50 Hz or 60 Hz, and is used to meet the power needs of residents, businesses and industrial users.

[0060] Supercapacitors, also known as supercapacitors, electrochemical capacitors, electrical double-layer capacitors, gold capacitors, farad capacitors, etc., are a new type of energy storage device between traditional capacitors and batteries. Supercapacitors are generally used to store or release electrical energy.

[0061] In the embodiments of the present application, the power supply can be a UPS (i.e., a second uninterruptible power supply) to ensure that, in the event of disconnection of the current uninterruptible power supply, the UPS replaces the disconnected uninterruptible power supply to continue power supply through the switching action of the first and second switching circuits, and the UPS has the same function as the disconnected uninterruptible power supply to ensure the reliability and stability of the important equipment in the rear stage.

[0062] In the embodiments of the present application, the power supply can be a power grid, which is generally stable and continuous, and will not be powered off in general cases, so it can replace the disconnected uninterruptible power supply to continuously supply power to the important equipment in the rear stage to maintain the normal operation of the important equipment in the rear stage.

[0063] In the embodiments of the present application, the power supply can be a supercapacitor, which can provide high-output electrical energy as a backup power supply to ensure that the important equipment in the rear stage can complete important data saving, alarm signal sending, normal operation and other tasks. In addition, the electrical energy output by the supercapacitor is relatively stable, which can improve the stability and reliability of the important equipment in the rear stage.

[0064] It should be understood that, in the case of normal output of the uninterruptible power supply, i.e., in the case of closing of the uninterruptible power supply, the first switching circuit 21 is closed and the second switching circuit 22 is disconnected, at this time the load is supplied with electrical energy by the uninterruptible power supply.

[0065] However, when the uninterruptible power supply is disconnected, the load cannot continue to work due to power loss, which may cause certain impact, therefore, in the embodiments of the present application, in the case of disconnection of the uninterruptible power supply, the first switching circuit 21 is disconnected and the second switching circuit 22 is closed to supply power to the load.

[0066] The switching device provided in the embodiments of the present application can supply power to the load through the uninterruptible power supply when the power grid or other power supply device connected with the load is disconnected and cannot supply power to the load, so that the important equipment can normally operate without shutdown during power interruption. On the other hand, when the uninterruptible power supply is disconnected, the power supply can be connected to the circuit through the switching action of the first switching circuit and the second switching circuit to supply power to the load, thereby ensuring the reliability and stability of the important equipment.

[0067] Based on the switching device provided in the above embodiments, referring to Figure 3 The switching device 30 provided in the embodiments of the present application can include a first switching circuit 21, a second switching circuit 22 and a current limiting circuit 31.

[0068] The first end of the current limiting circuit 31 is connected with the second end of the first switching circuit 21 and the second end of the second switching circuit 22, and the second end of the current limiting circuit 31 is connected with the load.

[0069] The current limiting circuit is a circuit for limiting the current in the circuit, such as a current limiting resistor, an inductive component and the like, which is not specifically limited here.

[0070] It should be understood that, in the case where the uninterruptible power supply is disconnected, the voltage on the load will suddenly change when switching from no voltage and no current to the power supply, thereby causing the generation of transient current. If the transient current is too large, the load or the power supply may be damaged. Therefore, in order to protect the load, the current limiting circuit can be provided to limit the current in the circuit, thereby ensuring that the important equipment operates in a stable current environment, thereby improving the stability of the equipment.

[0071] Based on the switching device provided in the above embodiments, referring to Figure 4 In a possible implementation manner, the switching device 40 provided in the embodiments of the present application can include a switching contactor. The switching contactor includes a normally open contact 41, a normally closed contact 42 and a coil 43. The normally open contact 41 is configured as a first switching circuit, the normally closed contact 42 is configured as a second switching circuit, and the coil 43 is connected with the output end of the uninterruptible power supply.

[0072] In the case where the uninterruptible power supply is closed, the normally open contact 41 is closed, and the normally closed contact 42 is disconnected.

[0073] In the case where the uninterruptible power supply is disconnected, the normally open contact 41 is disconnected, and the normally closed contact 42 is closed.

[0074] The switching contactor is an electrical device in a power transmission and distribution system, mainly used for controlling the connection and disconnection of capacitors in the power line.

[0075] The two normally open contacts are connected to the positive and negative poles of the output end of the uninterruptible power supply respectively, and the two normally closed contacts are connected to the positive and negative poles of the output end of the power supply respectively.

[0076] It should be understood that, in the embodiments of the present application, the normally open contact and the normally closed contact are in a mutual locking state, that is, one of the two contacts is closed and the other is opened at the same time. Since the coil is connected to the output end of the uninterruptible power supply, the output state of the uninterruptible power supply can be reflected through the coil.

[0077] As an example, it is assumed that the first switch circuit is a normally open contact and the second switch circuit is a normally closed contact, and the closing states of the normally open contact and the normally closed contact under the same condition are different, such as the coil being powered, the normally open contact being closed, and the normally closed contact being opened; the coil being unpowered, the normally open contact being opened, and the normally closed contact being closed, thereby realizing the "mutual locking" of the normally open contact and the normally closed contact.

[0078] When the coil is powered, it indicates that the uninterruptible power supply is in a working state (that is, the uninterruptible power supply is closed), at which time the normally closed contact is opened and the normally open contact is closed, and the uninterruptible power supply supplies power to the load.

[0079] When the coil is unpowered, it indicates that the uninterruptible power supply is disconnected, at which time the normally closed contact is closed and the normally open contact is opened, and the power supply is connected to the circuit to supply power to the load.

[0080] In this way, in the case that the power grid or other power supply equipment connected to the load is disconnected and cannot supply power to the load, the uninterruptible power supply can be used to supply power to the load to ensure that important equipment can operate normally without stopping during power interruption. On the other hand, when the uninterruptible power supply is disconnected, the normally closed contact and the normally open contact can be used to connect the power supply to the circuit to supply power to the load, thereby ensuring the reliability and stability of important equipment.

[0081] Based on the switch device provided in the above embodiments, in combination with Figure 5 As shown in FIG. 5, in a possible implementation, the switch device 50 provided by the embodiments of the present application can include a normally open switch 51 (that is, a first switch circuit), a normally closed switch 52 (that is, a second switch circuit), and a driving circuit 53. The first end of the driving circuit 53 is connected to the output end of the uninterruptible power supply, and the second end of the driving circuit 53 is connected to the normally open switch 51 and the normally closed switch 52.

[0082] In the embodiments of the present application, the normally open switch and the normally closed switch are controllable switches.

[0083] The driving circuit is an intermediate circuit between the main circuit and the control circuit, and its main function is to amplify the signal of the control circuit so that it can drive the switch device.

[0084] When the uninterrupted power supply is disconnected, the normally open switch is opened, and the normally closed switch is closed.

[0085] It should be understood that, since the driving circuit is connected with the output end of the uninterrupted power supply, that is, the uninterrupted power supply provides power, when the uninterrupted power supply is in a normal working state, the driving circuit is powered on, and the normally open switch is closed and the normally closed switch is opened according to the control signal of the control circuit; when the uninterrupted power supply is disconnected, the driving circuit is powered off at this time, and cannot amplify the control signal, that is, cannot drive the normally closed switch and the normally open switch, at this time the normally open switch is opened, and the normally closed switch is closed, and the power supply is connected to the circuit to supply power to the load.

[0086] Therefore, in the case that the power grid or other power supply equipment connected with the load is disconnected and cannot supply power to the load, the uninterrupted power supply can be used to supply power to the load to ensure that important equipment can operate normally without shutdown during power interruption; on the other hand, when the uninterrupted power supply is disconnected, the power supply can be connected to the circuit through the switching action of the normally closed switch and the normally open switch to supply power to the load, thereby ensuring the reliability and stability of important equipment.

[0087] Based on the switching device provided in the above embodiment, in combination with Figure 6 As shown in FIG. 6, in a possible implementation, the switching device 60 provided by the embodiment of the present application can include a normally open contact 41 (that is, a first switching circuit), a normally closed contact 42 (that is, a second switching circuit), a coil 43, and a feedback contact 61. The first end of the feedback contact 61 is connected with a power supply, and the second end of the feedback contact 61 is connected with a controller.

[0088] The power supply means a power supply of provided power, and the feedback contact means a contact for feeding back a signal to the controller.

[0089] In a possible implementation, the feedback contact can be a normally open contact or a normally closed contact.

[0090] When the feedback contact is closed, the port of the controller can receive a voltage; when the feedback contact is opened, the port of the controller has no voltage.

[0091] It should be understood that, if the feedback contact is a normally closed contact, when the coil is powered on, it indicates that the uninterrupted power supply is in a working state (that is, the uninterrupted power supply is closed, and the state of supplying power to the load), at this time the feedback contact is opened, and the port of the controller has no voltage; when the coil is powered off, it indicates that the uninterrupted power supply is disconnected, at this time the feedback contact is closed, the port of the controller has a voltage, and the uninterrupted power supply can be quickly reported to the maintenance personnel, thereby improving the safety and reliability of the power system.

[0092] Similarly, if the feedback contact is a normally open contact, when the coil is powered, it indicates that the uninterruptible power supply is in working condition, at this time the feedback contact is closed, the control port has voltage; when the coil is powered off, it indicates that the uninterruptible power supply is disconnected, at this time the feedback contact is open, the control port has no voltage, and then the uninterruptible power supply can be quickly reported to the maintenance personnel, thereby improving the safety and reliability of the power system.

[0093] Since the normally open contact is in an open state when not in action, the normally open contact is suitable for start control, and this control mode is flexible and easy to implement. In some application scenarios, such as control circuits that need to avoid misoperation, since the normally open contact is in an open state when not in action, even if the control circuit fails or is abnormal, the equipment will not misoperate.

[0094] Since the normally closed contact is in a closed state when not in working condition, the pressure between the contacts is large, which helps to ensure the stability of the connection and reduce the failure caused by poor contact. At the same time, the electric spark and wear generated by the normally closed contact when it is open are small, so its service life is relatively long, which is beneficial to reduce the equipment maintenance cost and prolong the service life of the equipment.

[0095] Therefore, in the embodiments of the present application, the feedback contact can be a normally open contact or a normally closed contact, and the type of the feedback contact can be determined according to the application scenario and the control requirement, in combination with the advantages of the normally open contact and the normally closed contact, which is not limited here.

[0096] Based on the switch device provided in the above embodiments, in combination with Figure 7 As shown in FIG. 7, in a possible implementation, the switch device 70 provided by the embodiments of the present application can include a current limiting circuit 31, a normally open contact 41, a normally closed contact 42, a coil 43 and a feedback contact 61. Wherein, the power supply is a power grid (i.e. mains).

[0097] In this way, when the power grid or other power supply equipment connected to the load is disconnected and cannot supply power to the load, the uninterruptible power supply can be used to supply power to the load to ensure that important equipment can operate normally during power interruption; when the uninterruptible power supply is disconnected, the normally open contact and the normally closed contact can be used to switch the power supply into the circuit to supply power to the load, thereby ensuring the reliability and stability of the important equipment.

[0098] In combination with Figure 8 As shown in FIG. 8, the embodiments of the present application also provide an uninterruptible power supply, which includes a power supply body 81 and a switch device 82 described in any of the above embodiments; wherein the power supply body 81 is connected with the first end of the first switch circuit of the switch device 82.

[0099] In a possible implementation, the uninterruptible power supply and the switching device provided by the embodiment of the present application can also communicate with the controller. When the uninterruptible power supply itself identifies a fault or an abnormality, the uninterruptible power supply can send a fault signal to the controller, so that the controller controls the switching device to switch the uninterruptible power supply to the power supply, thereby ensuring the stability and reliability of the system. In addition, the controller can also respond to the instructions of the maintenance personnel to control the switching device to switch the uninterruptible power supply to the power supply, thereby facilitating the maintenance personnel to maintain the uninterruptible power supply.

[0100] It should be noted that the control process of the controller in the embodiment of the present application is a known technology, which is not specifically described here.

[0101] It should be understood that in the embodiment of the present application, the switching device can be integrated inside the uninterruptible power supply, or can be arranged outside the uninterruptible power supply, or can be connected to the uninterruptible power supply as an independent device, which aims to provide a redundant circuit for the uninterruptible power supply, so as to access the standby power supply in the case of failure (disconnection) of the uninterruptible power supply, thereby ensuring the stability and reliability of the important equipment in the rear stage.

[0102] It should be noted that each embodiment in the present specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments.

[0103] The "first", "second" in the "first", "second" in the "first", "second" mentioned in the embodiment of the present application are only used for name identification, and do not represent the first, second in order.

[0104] The above is only one specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A switching device, characterized in that, include: First switching circuit and second switching circuit; The first terminal of the first switching circuit is used to connect to the output terminal of the uninterruptible power supply, the second terminal of the first switching circuit is used to connect to the load, the first terminal of the second switching circuit is used to connect to the power supply, and the second terminal of the second switching circuit is used to connect to the load. When the uninterruptible power supply is closed, the first switching circuit is closed and the second switching circuit is open, so that the uninterruptible power supply supplies power to the load. When the uninterruptible power supply is disconnected, the first switching circuit is disconnected and the second switching circuit is closed, so that the power supply supplies power to the load.

2. The switching device according to claim 1, characterized in that, Also includes: A current limiting circuit; the first terminal of the current limiting circuit is connected to the second terminal of the first switching circuit and the second terminal of the second switching circuit, and the second terminal of the current limiting circuit is used to connect the load.

3. The switching device according to claim 1 or 2, characterized in that, It also includes a switching contactor, which includes normally open contacts and normally closed contacts, wherein the normally open contacts are configured as the first switching circuit and the normally closed contacts are configured as the second switching circuit; When the uninterruptible power supply is closed, the normally open contact closes and the normally closed contact opens. When the uninterruptible power supply is disconnected, the normally open contact opens and the normally closed contact closes.

4. The switching device according to claim 1 or 2, characterized in that, The first switching circuit is a normally open switch, the second switching circuit is a normally closed switch, and the switching device further includes: a driving circuit; the first end of the driving circuit is connected to the output end of the uninterruptible power supply, and the second end of the driving circuit is connected to the normally open switch and the normally closed switch; When the uninterruptible power supply is closed, the normally open switch is closed and the normally closed switch is open. When the uninterruptible power supply is disconnected, the normally open switch opens and the normally closed switch closes.

5. The switching device according to claim 3, characterized in that, The switching device further includes: a feedback contact; a first end of the feedback contact is connected to a power supply; and a second end of the feedback contact is connected to a controller.

6. The switching device according to claim 5, characterized in that, The feedback contact is a normally open contact. When the uninterruptible power supply is closed, the normally open contact closes; The normally open contact opens when the uninterruptible power supply is disconnected. or, The feedback contact is a normally closed contact. When the uninterruptible power supply is closed, the normally closed contact opens; When the uninterruptible power supply is disconnected, the normally closed contact closes.

7. The switching device according to claim 1 or 2, characterized in that, The power supply can be any one of the following: the power grid, a supercapacitor, or a second uninterruptible power supply.

8. The switching device according to claim 1 or 2, characterized in that, When the uninterruptible power supply is in operation, the first switching circuit is closed and the second switching circuit is open, so that the uninterruptible power supply supplies power to the load.

9. An uninterruptible power supply, characterized in that, The uninterruptible power supply includes a power supply body and a switching device as described in any one of claims 1-8; The power supply unit is connected to the first terminal of the first switching circuit of the switching device.

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