Emergency power supply and power supply system

Abstract

In the emergency power supply and the power supply system, a host power supply unit of the power supply system is used for outputting direct current to a load according to alternating current input from the outside; the host power supply unit comprises an anode output end and a cathode output end; the at least two emergency power supply interfaces are used for connecting at least two emergency power supplies, and each emergency power supply interface comprises a positive electrode interface and a negative electrode interface; the switch piece is correspondingly connected with the emergency power supply interface, one end of the switch piece is connected to the anode output end, the other end is connected with the anode interface, and the cathode interface is connected to the cathode output end; according to the application, the emergency power supply interface is arranged, the emergency power supply can be accessed from the emergency power supply interface when the host power supply unit is subjected to capacity checking detection, the power supply stability in the capacity checking detection process can be improved, and at least two emergency power supply interfaces are arranged, so that at least two parallel emergency power supplies can be accessed; and the reliability and endurance performance of the emergency power supply can be improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power supply nuclear capacity, and particularly relates to an emergency power supply and a power supply system. BACKGROUND

[0002] In the maintenance and operation of a power system, it is crucial to ensure stable power supply of a substation. In the related art, the power supply source needs to be detected in nuclear capacity, etc. However, power supply source outage may occur in the detection process, thereby causing unstable power supply and other problems. CONTENT OF THE UTILITY MODEL

[0003] The application aims to provide an emergency power supply and a power supply system, and aims to solve the problem of unstable power supply of the power supply system in the prior art.

[0004] The first aspect of the embodiment of the application provides a power supply system, comprising:

[0005] a host power supply unit, configured to output direct current to a load according to external input alternating current; the host power supply unit comprises a positive output end and a negative output end;

[0006] at least two emergency power supply interfaces arranged in parallel, configured to connect at least two emergency power supplies, the emergency power supply interface comprising a positive interface and a negative interface;

[0007] at least two switch pieces, the switch pieces being connected with the emergency power supply interfaces in correspondence, one end of the switch piece being connected to the positive output end, the other end being connected to the positive interface, and the negative interface being connected to the negative output end.

[0008] In some embodiments of the application, the power supply system comprises a host case, the host power supply unit and the switch pieces are arranged in the host case, and the at least two emergency power supply interfaces are arranged on an inner case wall of the host case and exposed outside the host case.

[0009] In some embodiments of the application, the host case is further provided with a charging interface and an output interface, the charging interface being configured to connect alternating current to the host power supply unit, and the output interface being configured to connect direct current output by the host power supply unit to the load.

[0010] In some embodiments of the application, an input switch is arranged between the charging interface and the host power supply unit; and / or, an output switch is arranged between the output interface and the host power supply unit.

[0011] In some embodiments of the application, the negative interface is connected between the output switch and the host power supply unit.

[0012] In some embodiments of the present application, the emergency power interface further comprises a discharge interface for connecting the positive pole of the emergency power source and connecting the output switch, and a reverse prevention diode is further arranged between the discharge interface and the output switch, the positive pole of the reverse prevention diode is connected to the discharge interface, and the negative pole of the reverse prevention diode is connected to the output switch.

[0013] In some embodiments of the present application, the emergency power interface further comprises a control interface, and the power supply system comprises a control unit connected to the control interface to connect to the emergency power source.

[0014] In the second aspect, the present application further provides an emergency power source for connecting to the emergency power interface of the above-mentioned power supply system and for supplying power to the load when the main power supply unit stops supplying power to the load.

[0015] In some embodiments of the present application, the emergency power source comprises a charging switch, a discharging switch and an emergency power supply unit, the charging switch is arranged between the positive pole interface and the emergency power supply unit, the discharging switch is arranged between the discharge interface and the emergency power supply unit, and the negative pole of the emergency power supply unit is connected to the negative pole interface.

[0016] The charging switch is used to be turned on when the main power supply unit discharges, and the discharging switch is used to be turned on when the main power supply unit stops discharging.

[0017] In some embodiments of the present application, the emergency power source further comprises a pre-charging switch arranged in parallel with the discharging switch, and the pre-charging switch is used to be turned on before the charging switch.

[0018] The application has the beneficial effects that: in the emergency power supply and power supply system of the application, the power supply system comprises a host power supply unit, at least two parallelly arranged emergency power supply interfaces, and at least two switch pieces; the host power supply unit is used for outputting direct current to a load according to external input alternating current; the host power supply unit comprises a positive output end and a negative output end; the at least two emergency power supply interfaces are used for connecting at least two emergency power supplies, and the emergency power supply interface comprises a positive interface and a negative interface; the switch piece is correspondingly connected with the emergency power supply interface, one end of the switch piece is connected to the positive output end, the other end is connected to the positive interface, and the negative interface is connected to the negative output end; in the application, the emergency power supply is connected from the emergency power supply interface during the capacity detection of the host power supply unit, which is beneficial to improving the power supply stability during the capacity detection, and at least two emergency power supply interfaces are arranged, at least two parallelly arranged emergency power supplies can be connected, and the reliability and endurance performance of the emergency power supply are improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A frame structure schematic diagram of a power supply system provided by an embodiment of the application is shown.

[0020] Figure 2 A frame structure schematic diagram of a power supply system provided by another embodiment of the application is shown.

[0021] Specific element symbol description: 100-host power supply unit, 200-load, 300-switch piece, 400-emergency power supply interface, 500-emergency power supply. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects of the application clearer, the application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and not to limit the application.

[0023] It should be noted that when an element is referred to as being "arranged on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0024] In addition, the terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0025] It needs to be known that in the maintenance and operation of the power system, it is crucial to ensure the stable power supply of the substation. As a key node in the power system, the substation undertakes important tasks such as power transformation, distribution and transmission, and its power supply stability and reliability are directly related to the safe and stable operation of the entire power system. In order to ensure the stable power supply of the substation, it is necessary to regularly conduct capacity detection on the power supply. Capacity detection refers to the capacity check and performance test of the battery pack in the DC power supply system of the substation to verify whether it meets the operation requirements. Through capacity detection, problems such as capacity decline and performance degradation in the battery pack can be found in time, and appropriate maintenance measures can be taken to avoid power interruption due to battery pack failure at critical moments.

[0026] However, in the traditional capacity detection process, the power supply may be disconnected, which may lead to unstable power supply. Specifically, the traditional power supply system has incomplete battery state monitoring function, and the voltage monitoring precision is insufficient, which cannot effectively reflect the real operating conditions of the battery. This leads to the need for frequent manual voltage measurement and internal resistance test by the operation and maintenance personnel, which not only reduces the work efficiency, but also easily leads to power supply disconnection due to human operation errors. Moreover, the traditional DC power supply has no internal resistance test function, and the operation and maintenance personnel need to manually measure using mobile devices, which not only has low efficiency and large data deviation, but also may cause device short circuit or burning due to improper operation, thereby causing power interruption. Furthermore, the traditional power supply system has no effective battery capacity maintenance function, and needs to rely on mobile maintenance devices for manual capacity detection. This not only has complex operation and high risk, but also easily leads to power supply disconnection during capacity detection due to the large number of connections, large number of devices and large weight.

[0027] Based on this, the traditional emergency power supply and power supply system are improved.

[0028] Please refer to Figure 1 , Figure 1 The frame structure schematic diagram of the emergency power supply 500 provided for the embodiment; the power supply system of the embodiment includes a host power supply unit 100, at least two parallelly arranged emergency power supply interfaces 400, and at least two switch pieces 300; the host power supply unit 100 is used to output DC power to the load 200 according to the external input AC power; the host power supply unit 100 includes a positive output end and a negative output end; the at least two parallelly arranged emergency power supply interfaces 400 are used to connect at least two emergency power supplies 500, and the emergency power supply interface 400 includes a positive interface and a negative interface; the switch piece is connected with the emergency power supply interface in correspondence, and one end of the switch piece 300 is connected to the positive output end, and the other end is connected to the positive interface, and the negative interface is used to be connected to the negative output end.

[0029] It needs to be explained that the host power supply unit 100 is the core part of the whole power supply system, and its main function is to convert the external input alternating current into direct current and output to the load 200. The host power supply unit 100 includes a positive output end and a negative output end. The positive output end is used to output the positive of the converted direct current, and the negative output end is used to output the negative of the direct current. At least two emergency power supply interfaces 400 are used to connect at least two independent emergency power supplies 500, so as to provide backup power supply when the host power supply unit 100 fails or needs to be maintained. Each emergency power supply interface 400 includes a positive interface and a negative interface, which are connected with the positive and negative of the emergency power supply 500 respectively. When the host power supply unit 100 works normally, the load 200 is powered by the host power supply unit 100; and when the host power supply unit 100 needs to be maintained or fails, the emergency power supply 500 can timely power the load 200, and different emergency power supplies 500 can be switched by the switching element 300.

[0030] It can be understood that when the host power supply unit 100 works normally, the switching element 300 remains in the position of connecting the positive output end of the host power supply unit 100, and the host power supply unit 100 provides stable direct current to the load 200. If the host power supply unit 100 needs to be maintained, fails (power off, power down, etc.) or is in a charging state, the emergency power supply 500 can output voltage to the load 200 when no voltage is detected on the bus, and one or more emergency power supplies can be accessed by selecting one or more switching elements 300 to be turned on. At this time, the selected emergency power supply 500 provides direct current to the load 200, ensuring uninterrupted power supply.

[0031] The current power supply system is prone to power supply disconnection during the nuclear containment process, resulting in low power supply stability. However, in the present application, by setting the emergency power supply interface 400, the emergency power supply 500 can be accessed from the emergency power supply interface 400 when the host power supply unit 100 is detected for nuclear containment, which is beneficial to improve the power supply stability during the nuclear containment detection process, and by setting at least two emergency power supply interfaces 400, at least two parallel emergency power supplies 500 can be accessed, which is beneficial to improve the reliability and endurance performance of the emergency power supply 500.

[0032] In some embodiments of the present application, please refer to Figure 2 , Figure 2 The structure schematic diagram of the power supply system provided by the embodiment is shown; the power supply system of the embodiment includes a host case, the host power supply unit 100 and the switching element 300 are arranged in the host case, and at least two emergency power supply interfaces 400 are arranged on the inner wall of the host case and exposed outside the host case.

[0033] It needs to be explained that the host case is the carrier and protective shell of the entire power supply system, which provides a closed and safe environment for the installation and accommodation of the host power supply unit 100, the switch piece 300 and part of the circuit connection. The design of the host case should have good heat dissipation performance and protection level to ensure the stable operation of the system under high load or harsh environment. Each emergency power supply interface 400 includes a positive interface and a negative interface, so that the emergency power supply 500 can be easily connected to the system and provide backup power when needed.

[0034] In some embodiments, the switch piece 300 is a switching control relay.

[0035] In some embodiments, the host power supply unit 100 can be a direct current charger, which can be used to convert alternating current into direct current.

[0036] In some embodiments of the present application, please continue to refer to Figure 2 The host case of the present embodiment is also provided with a charging interface and an output interface. The charging interface is used to connect the alternating current to the host power supply unit 100, and the output interface is used to connect the direct current output by the host power supply unit 100 to the load 200.

[0037] It needs to be explained that the charging interface is located outside the host case, which is used to connect the external alternating current power supply to the host power supply unit 100 for charging or power supply. The design of the charging interface considers safety and ease of use, ensuring stable connection and transmission of alternating current. The output interface is also located outside the host case, which is used to connect the direct current output by the host power supply unit 100 to the load 200. The design of the output interface considers compatibility and stability, ensuring high-quality transmission of direct current and stable power supply of the load 200.

[0038] It can be understood that when the host power supply unit 100 is working normally, the alternating current connected through the charging interface is converted into direct current, and the stable power output is provided to the load 200 through the output interface. If the host power supply unit 100 needs to be maintained, fails or needs to be detected, the emergency power supply 500 connected to the positive interface of any emergency power supply interface 400 exposed outside the host case is used to supply power to the load 200. At this time, the selected emergency power supply 500 provides direct current to the load 200 through the output interface, ensuring uninterrupted power supply.

[0039] In some embodiments of the present application, please continue to refer to Figure 2 The charging interface and the host power supply unit 100 of the present embodiment are provided with an input switch; and / or, the output interface and the host power supply unit 100 are provided with an output switch.

[0040] It needs to be explained that the input switch is set between the charging interface and the host power supply unit 100, which is used to control the access and disconnection of alternating current. When the host power supply unit 100 needs to be maintained or replaced, the alternating current power supply can be cut off by closing the input switch, which improves the safety of operation. The output switch is set between the output interface and the host power supply unit 100, which is used to control the output and disconnection of direct current. When the load 200 needs to be maintained or replaced, the direct current power supply can be cut off by closing the output switch, which avoids accidental electric shock or damage to the load 200.

[0041] In some embodiments of the present application, please refer to Figure 2 The negative electrode interface of the present embodiment is connected between the output switch and the host power supply unit 100.

[0042] It can be understood that the negative electrode interface is placed on the circuit path between the output switch and the host power supply unit 100. In the process of direct current flowing from the host power supply unit 100 to the load 200, the negative electrode current must first pass through the negative electrode interface, then pass through the output switch, and finally reach the load 200. Placing the negative electrode interface before the output switch (relative to the current flow direction) can ensure that the negative electrode current is completely cut off when the output switch is closed, avoiding the risk of current leakage or short circuit. This improves the safety of the entire power supply system.

[0043] In some embodiments of the present application, please refer to Figure 2 The emergency power supply interface of the present embodiment further comprises a discharge interface for connecting the positive electrode of the emergency power supply and connecting the output switch. A reverse prevention diode is further provided between the discharge interface and the output switch. The positive electrode of the reverse prevention diode is connected to the discharge interface, and the negative electrode of the reverse prevention diode is connected to the output switch.

[0044] It needs to be explained that the reverse prevention diode, also known as a unidirectional conduction diode, is an electronic component that only allows current to flow in one direction. When the current flows from the positive electrode to the negative electrode of the reverse prevention diode, the diode is turned on; when the current direction is reversed, the diode prevents current flow, protecting the circuit.

[0045] It can be understood that the positive electrode of the reverse prevention diode is connected to the discharge interface, and the negative electrode is connected to the output switch. In this way, when direct current flows from the host power supply unit 100 to the load 200 through the discharge interface, the current will first pass through the reverse prevention diode, then pass through the output switch, and finally reach the load 200. When the power is correctly connected, i.e. the current flows from the discharge interface to the output switch, the reverse prevention diode is in a forward bias state, and the current can flow smoothly, and the circuit works normally. When the power is reversed, i.e. the current tries to flow from the output switch to the discharge interface, the reverse prevention diode is in a reverse bias state, preventing current flow, thereby protecting the load 200 and the power supply system from damage.

[0046] In some embodiments of the present application, the emergency power supply interface 400 of the present embodiments further comprises a control interface, and the power supply system comprises a control unit connected with the control interface to connect with the emergency power supply 500.

[0047] It can be understood that the control interface, as a part of the emergency power supply interface 400, is mainly used to realize the communication and control between the power supply system and the emergency power supply 500. It allows the control unit of the power supply system to send instructions to the emergency power supply 500, such as starting, stopping, adjusting output voltage or current, etc., while also being able to receive status information from the emergency power supply 500, such as power, voltage, current, etc. Through the connection with the control interface, the control unit can realize intelligent control, state monitoring, fault alarm, remote monitoring, etc.

[0048] In some embodiments, the control unit is connected with the positive output end and the negative output end, which can be used to collect signals of the positive output end and the negative output end. The control unit and the positive output end and the negative output end are both provided with diodes, the anode of the diode is connected with the positive output end / negative output end, and the cathode of the diode is connected with the control unit.

[0049] In some embodiments, please refer to Figure 2 , the control unit comprises a display screen, and the power supply system can be controlled through the display screen.

[0050] In order to better implement the power supply system in any of the above embodiments, on the basis of the above power supply system, please refer to Figure 2 , the present embodiments further provide an emergency power supply 500, which is used to access the emergency power supply interface 400 of the above power supply system, and the emergency power supply 500 is used to supply power to the load 200 in the case that the host power supply unit 100 stops supplying power to the load 200.

[0051] It needs to be explained that the main function of the emergency power supply 500 is to replace and continue to provide power to these loads 200 in the case that the host power supply unit 100 stops supplying power to the load 200. In this way, even if the main power supply fails, the critical load 200 equipment can still run, thereby ensuring the continuity and stability of the system and avoiding the loss or failure that may be caused by power interruption.

[0052] In some embodiments of the present application, please refer to Figure 2The emergency power supply 500 of the embodiment includes a charging switch, a discharging switch, and an emergency power supply unit. The charging switch is connected between the positive terminal and the emergency power supply unit. The discharging switch is connected between the discharging terminal and the emergency power supply unit. The negative terminal of the emergency power supply unit is connected to the negative terminal. The charging switch is turned on when the host power supply unit 100 is discharging. The discharging switch is turned on when the host power supply unit 100 stops discharging.

[0053] It can be understood that when the host power supply unit 100 is in the discharging state (i.e., normally supplies power to the load 200), the charging switch is turned on. This allows the host power supply unit 100 to charge the emergency power supply unit at the same time, ensuring that the emergency power supply 500 can take over the power supply task quickly when needed. When the host power supply unit 100 stops discharging (i.e., stops supplying power to the load 200, possibly due to a fault, maintenance, or other reasons), the discharging switch is turned on. This allows the emergency power supply unit to start supplying power to the load 200, ensuring the continuity and stability of the system.

[0054] In some embodiments of the present application, please refer to Figure 2 The emergency power supply 500 of the embodiment further includes a pre-charging switch, which is connected in parallel with the discharging switch. The pre-charging switch is turned on before the charging switch.

[0055] It can be understood that when the emergency power supply 500 is preparing to recharge from the discharging state (i.e., the power decreases after supplying power to the load 200), the pre-charging switch is turned on before the charging switch. The purpose of this step is to pre-charge, i.e., gradually increase the voltage of the emergency power supply unit in a relatively gentle manner, to avoid damage to the battery or circuit caused by sudden large current charging.

[0056] In some embodiments, the emergency power supply unit includes a lithium iron phosphate battery pack.

[0057] In some embodiments, the charging switch can be a charging relay, the pre-charging switch can be a pre-charging relay, and the discharging switch can be a discharging relay.

[0058] In some embodiments, the emergency power supply 500 is provided with a management unit (BMS), which is used to manage the charging and discharging of the emergency power supply unit, and the management unit is connected to the control unit through a control interface.

[0059] The emergency power supply 500 has the function of charging and discharging at the same time in the embodiments of the present application. Specifically, when the lithium battery pack has an electric quantity greater than or equal to 100% SOC, charging is prohibited, and the lithium battery pack normally outputs electric energy; when the lithium battery pack has an electric quantity less than or equal to 85% SOC, charging is started, and the lithium battery pack normally outputs electric energy; in the case of connecting alternating current every time the lithium battery pack is powered on, the lithium battery pack is directly charged to 100% SOC; if the lithium battery pack is not low in power, the lithium battery pack normally outputs electric energy.

[0060] In the above embodiments, the description of each embodiment has its own focus. The parts not described or recorded in detail in a certain embodiment can be referred to the related description of other embodiments.

[0061] The above has described the basic concept. Obviously, the above detailed disclosure is only used as an example and does not limit the present application for those skilled in the art. Although it is not explicitly stated here, those skilled in the art can make various modifications, improvements and corrections to the present application. Such modifications, improvements and corrections are suggested in the present application, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the present application.

[0062] At the same time, specific words are used in the present application to describe the embodiments of the present application. As "one embodiment", "an embodiment", and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that the "an embodiment" or "one embodiment" or "one alternative embodiment" mentioned in different places in the specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be properly combined.

[0063] Similarly, it should be noted that, in order to simplify the description of the present application and to help understand one or more utility model embodiments, sometimes multiple features are combined into one embodiment, figure or description thereof in the foregoing description of the embodiments of the present application. However, this disclosure method does not mean that the features required by the present application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the disclosed single embodiment.

[0064] The above described embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A power supply system characterized by comprising: The power supply system comprises: a host power supply unit for outputting direct current to a load according to external input alternating current; the host power supply unit comprises a positive output end and a negative output end; at least two emergency power supply interfaces in parallel for connecting at least two emergency power supplies; the emergency power supply interfaces comprise positive interfaces and negative interfaces; at least two switch elements corresponding to the emergency power supply interfaces; one end of the switch element is connected to the positive output end, and the other end is connected to the positive interface; the negative interface is connected to the negative output end.

2. The power supply system of claim 1, wherein, The power supply system comprises a host case, and the host power supply unit and the switch element are arranged in the host case, and the at least two emergency power supply interfaces are arranged on the inner wall of the host case and exposed outside the host case.

3. The power supply system of claim 2, wherein, The host case is further provided with a charging interface and an output interface; the charging interface is used for connecting alternating current to the host power supply unit; and the output interface is used for connecting direct current output by the host power supply unit to the load.

4. The power supply system of claim 3, wherein An input switch is arranged between the charging interface and the host power supply unit; and / or, an output switch is arranged between the output interface and the host power supply unit.

5. The power supply system of claim 4, wherein, The negative interface is connected between the output switch and the host power supply unit.

6. The power supply system of claim 5, wherein, The emergency power supply interface further comprises a discharge interface for connecting the positive pole of the emergency power supply and connecting the output switch; a reverse prevention diode is further arranged between the discharge interface and the output switch; the positive pole of the reverse prevention diode is connected to the discharge interface; and the negative pole of the reverse prevention diode is connected to the output switch.

7. The power supply system of claim 2, wherein, The emergency power supply interface further comprises a control interface; the power supply system comprises a control unit connected to the control interface to connect to the emergency power supply.

8. An emergency power supply, characterized by The emergency power supply is used for connecting to the emergency power supply interface of the power supply system according to any one of claims 1 to 7, and the emergency power supply is used for supplying power to the load when the host power supply unit stops supplying power to the load.

9. The emergency power supply of claim 8, wherein, The emergency power supply comprises a charging switch element, a discharge switch element and an emergency power supply unit; the charging switch element is used for connecting between the positive interface and the emergency power supply unit; the discharge switch element is used for connecting between the discharge interface and the emergency power supply unit; and the negative pole of the emergency power supply unit is used for connecting the negative interface. The charging switch element is used for conducting when the host power supply unit discharges; and the discharge switch element is used for conducting when the host power supply unit stops discharging.

10. The emergency power supply of claim 9, wherein, The emergency power supply further comprises a pre-charging switch element arranged in parallel with the discharge switch element; and the pre-charging switch element is used for conducting prior to the charging switch element.

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