An emergency lighting power supply system and power supply box

Abstract

The utility model discloses an emergency lighting power supply system and power supply box, system includes: three -phase alternating current bus, the input end of alternating current distribution device inserts the output end of any one phase in A phase, B phase and C phase of three -phase alternating current bus, the input end of rectifier device is connected with the output end of alternating current distribution device, the output voltage of photovoltaic direct current source is matched with the output voltage of rectifier device, the first direct current input end of direct current source switching device is connected with the output end of rectifier device, and the second direct current input end of direct current source switching device is connected with the output end of photovoltaic direct current source, the input end of direct current bus is connected with the output end of direct current source switching device, the input end of direct current distribution device is connected with the output end of direct current bus, and the input end of emergency evacuation lamp is connected with the output end of direct current distribution device. Through photovoltaic direct current source, eliminate the energy loss of inverter conversion link, reduce the position of system fault point, improve energy utilization efficiency.

Description

Technical Field

[0001] This utility model relates to the field of lighting power supply technology, and in particular to an emergency lighting power supply system and power supply box. Background Technology

[0002] In fire emergency lighting systems on the same floor of a building, two types of lamps (AC and DC) are usually installed to meet the safety needs of different areas.

[0003] In existing technologies, photovoltaic (PV) power sources are often introduced as backup power to provide redundant power to lighting fixtures. PV power sources typically need to drive both AC and DC lighting fixtures simultaneously, making inversion an essential step. However, because PV power sources require inverters, this increases the number of potential system failure points and causes energy loss, resulting in low utilization rates. Therefore, improving the utilization rate of PV power sources in fire emergency lighting is a pressing technical problem that needs to be solved. Utility Model Content

[0004] This application provides an emergency lighting power supply system and power supply box, which solves the technical problem of low utilization rate of photovoltaic power in fire emergency lighting in the prior art, and achieves the technical effect of improving the utilization rate of photovoltaic power in fire emergency lighting.

[0005] In a first aspect, this application provides an emergency lighting power supply system, comprising:

[0006] Three-phase AC busbar;

[0007] An AC power distribution device, wherein the input terminal of the AC power distribution device is connected to any one of phases A, B, and C of the output terminal of a three-phase AC bus;

[0008] A rectifier, the input of which is connected to the output of the AC power distribution unit;

[0009] A photovoltaic DC power supply, the output voltage of which is matched with the output voltage of the rectifier;

[0010] A DC power switching device, wherein the first DC input terminal of the DC power switching device is connected to the output terminal of the rectifier, and the second DC input terminal of the DC power switching device is connected to the output terminal of the photovoltaic DC power supply.

[0011] The DC bus is connected to the output of the DC power switching device.

[0012] A DC power distribution device, the input end of which is connected to the output end of a DC bus;

[0013] Emergency evacuation lighting fixtures, the input terminal of which is connected to the output terminal of the DC power distribution device.

[0014] In some embodiments of this application, based on the foregoing scheme, the system further includes:

[0015] AC power distribution, with at least two AC power distribution circuits;

[0016] An AC power switching device includes at least two AC input terminals, each corresponding to an AC power distribution source, with each AC input terminal connected to a corresponding AC power distribution source; the output terminal of the AC power switching device is connected to the input terminal of a three-phase AC bus.

[0017] In some embodiments of this application, based on the foregoing scheme, the system further includes:

[0018] The first battery is connected to the first DC input terminal via the output terminal of the rectifier; the input terminal of the first battery is connected to the output terminal of the rectifier, and the output terminal of the first battery is connected to the first DC input terminal.

[0019] In some embodiments of this application, based on the foregoing scheme, the photovoltaic DC power supply includes:

[0020] Photovoltaic power generation equipment, the output voltage of the photovoltaic power generation equipment is matched with the output voltage of the rectifier;

[0021] The second battery has its input terminal connected to the output terminal of the photovoltaic power generation equipment, and its output terminal connected to the second DC input terminal.

[0022] In some embodiments of this application, based on the aforementioned scheme, multiple DC power distribution devices are provided, and the input terminal of each DC power distribution device is connected to the output terminal of the DC bus.

[0023] There are multiple emergency evacuation lights, and each emergency evacuation light corresponds to a DC power distribution device. The input terminal of each emergency evacuation light is connected to the output terminal of a corresponding DC power distribution device.

[0024] In some embodiments of this application, based on the foregoing scheme, the system further includes:

[0025] A standby AC power distribution unit, the input terminal of which is connected to any one of phases A, B and C of the output terminal of the three-phase AC bus;

[0026] The input terminal of the standby lighting fixture is connected to the output terminal of the standby AC power distribution unit.

[0027] In some embodiments of this application, based on the aforementioned scheme, multiple backup AC power distribution devices are provided, and the input terminal of each backup AC power distribution device is connected to any one of phases A, B and C of the three-phase AC bus output terminal;

[0028] There are multiple backup lighting fixtures, and each backup lighting fixture corresponds to a backup AC power distribution device. The input terminal of each backup lighting fixture is connected to the output terminal of a corresponding backup AC power distribution device.

[0029] In some embodiments of this application, based on the aforementioned scheme, the rated voltage of the standby lighting fixtures is AC220V, and the rated voltage of the emergency evacuation lighting fixtures is DC24V.

[0030] In some embodiments of this application, based on the aforementioned scheme, the input voltage of the rectifier is AC220V and the output voltage of the rectifier is DC24V.

[0031] Secondly, this application provides an emergency lighting power supply box that is compatible with the emergency lighting power supply system provided in the first aspect.

[0032] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0033] This application provides an emergency lighting power supply system, including: a three-phase AC busbar; an AC power distribution device, the input terminal of which is connected to any one of phases A, B, and C of the output terminal of the three-phase AC busbar; a rectifier, the input terminal of which is connected to the output terminal of the AC power distribution device; a photovoltaic DC power supply, the output voltage of which is matched with the output voltage of the rectifier; a DC power switching device, the first DC input terminal of which is connected to the output terminal of the rectifier, and the second DC input terminal of which is connected to the output terminal of the photovoltaic DC power supply; a DC busbar, the input terminal of which is connected to the output terminal of the DC power switching device; a DC power distribution device, the input terminal of which is connected to the output terminal of the DC busbar; and emergency evacuation lights, the input terminal of which is connected to the output terminal of the DC power distribution device.

[0034] As can be seen, the embodiments of this application directly convert light energy into DC power through a photovoltaic DC power supply, eliminating energy loss in the inverter conversion process, reducing the location of system failure points, and improving energy utilization efficiency. Furthermore, the photovoltaic DC power supply, in conjunction with the three-phase AC bus, provides redundant power supply for emergency evacuation lighting fixtures. If one power supply fails, the other can still operate independently, reducing the risk of AC / DC interference and improving power supply continuity, evacuation safety, and system reliability. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of an emergency lighting power supply system provided in an embodiment of this application. Detailed Implementation

[0037] This application provides an emergency lighting power supply system, which solves the technical problem of low utilization rate of photovoltaic power in fire emergency lighting in the prior art.

[0038] The technical solution of this application embodiment is to solve the above-mentioned technical problems, and the general idea is as follows:

[0039] This application provides an emergency lighting power supply system, including: a three-phase AC busbar; an AC power distribution device, the input terminal of which is connected to any one of phases A, B, and C of the output terminal of the three-phase AC busbar; a rectifier, the input terminal of which is connected to the output terminal of the AC power distribution device; a photovoltaic DC power supply, the output voltage of which is matched with the output voltage of the rectifier; a DC power switching device, the first DC input terminal of which is connected to the output terminal of the rectifier, and the second DC input terminal of which is connected to the output terminal of the photovoltaic DC power supply; a DC busbar, the input terminal of which is connected to the output terminal of the DC power switching device; a DC power distribution device, the input terminal of which is connected to the output terminal of the DC busbar; and emergency evacuation lights, the input terminal of which is connected to the output terminal of the DC power distribution device.

[0040] As can be seen, the embodiments of this application directly convert light energy into DC power through a photovoltaic DC power supply, eliminating energy loss in the inverter conversion process, reducing the location of system failure points, and improving energy utilization efficiency. Furthermore, the photovoltaic DC power supply, in conjunction with the three-phase AC bus, provides redundant power supply for emergency evacuation lighting fixtures. If one power supply fails, the other can still operate independently, reducing the risk of AC / DC interference and improving power supply continuity, evacuation safety, and system reliability.

[0041] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0042] First, it should be clarified that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0043] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.

[0044] It should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0045] It should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] National standards set forth clear requirements for fire emergency lighting and evacuation guidance systems, stipulating that buildings must be equipped with both low-voltage (usually DC24V) and standard-voltage (e.g., AC220V) lighting fixtures, and both must be powered by dual power sources to meet the safety needs of different areas.

[0047] In existing technologies, configuring separate power supply systems for two types of lighting fixtures leads to an increase in the number of interconnecting power supply devices, occupying additional installation space and increasing system complexity and cost. For low-voltage lighting fixtures, centralized power supply is currently commonly used. However, when the centralized power supply fails, there is a lack of backup DC power supply mechanisms, preventing the lighting fixtures from operating normally and severely impacting evacuation safety and reliability.

[0048] While existing technologies attempt to incorporate renewable energy sources (such as photovoltaic power) to optimize systems, significant shortcomings remain. Some solutions introduce an inverter stage during the photovoltaic power-to-DC conversion process, which not only increases the number of potential failure points but also leads to energy loss and reduced energy efficiency. Other solutions employ a single-power-circuit design, relying solely on battery power when the main power supply fails. However, the inherent characteristics of batteries limit the duration of power supply and overall reliability. Furthermore, some systems cannot maintain lighting functionality when critical equipment (such as dedicated power cabinets) fails, impacting evacuation safety.

[0049] To address the aforementioned problems, embodiments of this application provide an emergency lighting power supply system. For example... Figure 1 The diagram shown is a structural schematic of an emergency lighting power supply system provided in an embodiment of this application, including: an AC power distribution power supply 1, an AC power switching device 2, a three-phase AC busbar 3, an AC power distribution device 41, a rectifier device 42, a photovoltaic DC power supply 5, a DC power switching device 44, a DC busbar 45, and an emergency evacuation lighting fixture 47.

[0050] The AC power distribution source 1 is provided with at least two sources, each sourced from a different low-voltage busbar, to facilitate switching to the backup power source in the event of a main power failure, thus meeting power redundancy requirements. In subsequent embodiments of this application, two power sources ( Figure 1 Taking the AC power distribution power supply 1 connected to the AC power switching device on the right side via two lines as an example, this application continues to introduce an emergency lighting power supply system provided in the embodiments.

[0051] The AC power switching device 2 includes at least two AC input terminals, each corresponding to an AC power distribution source 1, with each input terminal connected to a corresponding AC power distribution source 1. The output terminal of the AC power switching device 2 is connected to the input terminal of the three-phase AC bus 3. The AC power switching device 2 is used to receive power input from at least two AC power distribution sources 1. When one of the AC power distribution sources 1 that is currently supplying power fails, it can automatically switch to the other AC power distribution source 1 as a backup, thereby ensuring the continuity of power supply to the three-phase AC bus 3.

[0052] The line voltage of the three-phase AC bus 3 is AC380V. As the power distribution hub, it provides a stable voltage platform and transmits the received AC power to the AC power distribution device 41.

[0053] The input terminal of the AC power distribution device 41 is connected to any one of phases A, B, and C of the output terminal of the three-phase AC bus 3. The AC power distribution device 41 draws single-phase power (any one of phases A, B, and C) from the three-phase AC bus 3 and distributes the power to the rectifier device 42 to achieve load balancing. It is understood that since the line voltage of the three-phase AC bus 3 is AC380V, the phase voltage of its single-phase power is AC220V.

[0054] The input terminal of the rectifier 42 is connected to the output terminal of the AC power distribution device 41. Specifically, the input voltage of the rectifier 42 is 220V and the output voltage is 24V. It converts the AC power (AC220V) output by the AC power distribution device 41 into DC power (DC24V) to provide an appropriate voltage for DC side equipment and battery charging.

[0055] The photovoltaic DC power supply 5 converts solar energy into DC power, and its output voltage is matched with that of the rectifier 42 (both are DC 24V), which is directly injected into the DC power switching device 44. Since photovoltaic energy serves as a backup power source to supply power to the DC bus 45 in this embodiment, no inversion is required. The light energy is directly converted into DC power, reducing failure points, eliminating inverter losses, and improving the utilization rate of photovoltaic energy.

[0056] The first DC input terminal of the DC power switching device 44 is connected to the output terminal of the rectifier 42, and the second DC input terminal of the DC power switching device 44 is connected to the output terminal of the photovoltaic DC power supply 5. The DC power switching device 44 is used to switch between two DC inputs (rectifier 42 or photovoltaic DC power supply 5). Under normal circumstances, rectifier 42 is preferred as the DC input. When both AC power distribution power supplies 1 fail simultaneously or the branch where rectifier 42 is located fails, the power supply is switched to photovoltaic DC power supply 5.

[0057] The input terminal of DC bus 45 is connected to the output terminal of DC power switching device 44. DC bus 45 is used to collect the electrical energy output by DC power switching device 44, form a stable DC voltage platform, and distribute it uniformly to DC power distribution device 46.

[0058] The input terminal of the DC power distribution device 46 is connected to the output terminal of the DC bus 45 to receive the power from the DC bus 45 and distribute it reasonably to each emergency evacuation lighting circuit 47 to achieve overload protection and circuit management.

[0059] The input terminal of the emergency evacuation lighting fixture 47 is connected to the output terminal of the DC power distribution device 46. The rated voltage of the emergency evacuation lighting fixture 47 is DC24V, which is used to provide evacuation lighting in emergency situations.

[0060] Furthermore, multiple DC power distribution devices 46 and multiple emergency evacuation lights 47 are provided. The input terminal of each DC power distribution device 46 is connected to the output terminal of the DC bus 45. Each emergency evacuation light 47 corresponds to a DC power distribution device 46, and the input terminal of each emergency evacuation light 47 is connected to the output terminal of a corresponding DC power distribution device 46.

[0061] As a downstream branch node of the DC bus 45, each DC power distribution unit 46 independently receives power input from the DC bus 45 and provides overcurrent protection, short-circuit protection, branch control, and status monitoring for the connected emergency evacuation lights 47. Each emergency evacuation light 47 is independently connected to its corresponding DC power distribution unit 46, forming a point-to-point power supply link and directly driven by DC power. A failure of a single DC power distribution unit 46 only affects its corresponding emergency evacuation light 47, narrowing the scope of the fault. Furthermore, when a single emergency evacuation light 47 fails, the fault can be precisely linked to the corresponding DC power distribution unit 46, improving maintenance efficiency.

[0062] Furthermore, the emergency lighting power supply system also includes a first storage battery 43, which is disposed between the rectifier 42 and the DC power switching device 44. The output terminal of the rectifier 42 is connected to the first DC input terminal through the first storage battery 43. Specifically, the input terminal of the first storage battery 43 is connected to the output terminal of the rectifier 42, and the output terminal of the first storage battery 43 is connected to the first DC input terminal. The first storage battery 43 is used to store the DC power converted by the rectifier 42 and can serve as a backup power source when both AC power distribution sources 1 are interrupted, ensuring uninterrupted emergency power supply.

[0063] Furthermore, the photovoltaic DC power supply 5 includes a photovoltaic power generation device 51 and a second storage battery 52.

[0064] The photovoltaic power generation device 51 directly converts solar energy into direct current, which can be directly injected into the second battery 52 without the need for additional conversion equipment, avoiding inverter losses and improving energy utilization. The output voltage of the photovoltaic power generation device 51 is matched with the output voltage of the rectifier device 42 (e.g., DC 24V).

[0065] The input terminal of the second battery 52 is connected to the output terminal of the photovoltaic power generation device 51, and the output terminal of the second battery 52 is connected to the second DC input terminal. The second battery 52 is used to store the surplus electrical energy of the photovoltaic power generation device 51, which is released when there is insufficient sunlight, thereby improving the continuity of photovoltaic power supply. At the same time, in the event of an AC power failure, the second battery 52 can also work with the first battery 43 to support the DC bus 45, ensuring emergency lighting. By directly supplying power to the DC bus 45 through dual-energy type dual battery energy storage, conversion losses are reduced on the energy side, and triple redundancy is formed on the power supply side: "AC power distribution 1 - battery - photovoltaic DC power supply 5", improving system reliability and energy efficiency.

[0066] Furthermore, the emergency lighting power supply system also includes a backup AC power distribution device 61 and a backup lighting fixture 62.

[0067] The input terminal of the backup AC distribution unit 61 is connected to any one of the A, B, and C phases of the output terminal of the three-phase AC bus 3. Multiple backup AC distribution units 61 can be installed, with each unit's input terminal connected to any one of the A, B, and C phases of the output terminal of the three-phase AC bus 3. Each backup AC distribution unit 61 draws power directly from a single phase (A / B / C) of the 380V three-phase AC bus 3, physically isolating the DC power supply system and avoiding AC / DC interference. Furthermore, multiple backup AC distribution units 61 can be distributed and connected to different phases (e.g., alternating between A, B, and C phases) to balance the three-phase load and prevent phase imbalances from causing bus voltage fluctuations.

[0068] The input terminal of the backup lighting fixture 62 is connected to the output terminal of the backup AC power distribution device 61. The rated voltage of the backup lighting fixture 62 is AC220V. Multiple backup lighting fixtures 62 can be provided, with each fixture corresponding to a specific backup AC power distribution device 61. The input terminal of each backup lighting fixture 62 is connected to the output terminal of a corresponding backup AC power distribution device 61. Each backup lighting fixture 62 is independently connected to its corresponding backup AC power distribution device 61, forming a point-to-point highly reliable link and eliminating the risk of cascading failures.

[0069] Since the backup lighting fixture 62 and the emergency evacuation lighting fixture 47 share the three-phase AC bus 3, while meeting the national standard's dual protection requirements for the two types of lighting fixtures (DC24V low-voltage lighting fixtures and AC220V standard voltage lighting fixtures), the number of mutual power supplies can be reduced and equipment space can be saved during the equipment manufacturing process.

[0070] In summary, this application provides an emergency lighting power supply system, including: a three-phase AC busbar 3; an AC power distribution device 41, the input terminal of which is connected to any one of phases A, B, and C of the output terminal of the three-phase AC busbar 3; a rectifier device 42, the input terminal of which is connected to the output terminal of the AC power distribution device 41; a photovoltaic DC power supply 5, the output voltage of which is matched with the output voltage of the rectifier device 42; a DC power switching device 44, the first DC input terminal of which is connected to the output terminal of the rectifier device 42, and the second DC input terminal of which is connected to the output terminal of the photovoltaic DC power supply 5; a DC busbar 45, the input terminal of which is connected to the output terminal of the DC power switching device 44; a DC power distribution device 46, the input terminal of which is connected to the output terminal of the DC busbar 45; and an emergency evacuation lamp 47, the input terminal of which is connected to the output terminal of the DC power distribution device 46.

[0071] As can be seen, the embodiments of this application directly convert light energy into DC power energy through photovoltaic DC power supply 5, eliminating energy loss in the inverter conversion stage, reducing the location of system failure points, and improving energy utilization efficiency. Furthermore, the photovoltaic DC power supply 5, in conjunction with the three-phase AC bus 3, provides redundant power supply to the emergency evacuation lights 47. If one power supply fails, the other can still operate independently, reducing the risk of AC / DC interference and improving power supply continuity, evacuation safety, and system reliability.

[0072] Based on the same inventive concept, this application also provides an emergency lighting power supply box that is compatible with the aforementioned emergency lighting power supply system.

[0073] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0074] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. An emergency lighting power supply system, characterized in that, include: Three-phase AC busbar; An AC power distribution device, wherein the input terminal of the AC power distribution device is connected to any one of phases A, B, and C of the output terminal of the three-phase AC bus; A rectifier, wherein the input terminal of the rectifier is connected to the output terminal of the AC power distribution device; A photovoltaic DC power supply, wherein the output voltage of the photovoltaic DC power supply is matched with the output voltage of the rectifier; A DC power switching device, wherein the first DC input terminal of the DC power switching device is connected to the output terminal of the rectifier, and the second DC input terminal of the DC power switching device is connected to the output terminal of the photovoltaic DC power supply; A DC bus, the input end of which is connected to the output end of the DC power switching device; A DC power distribution device, wherein the input terminal of the DC power distribution device is connected to the output terminal of the DC bus; An emergency evacuation lighting fixture, wherein the input terminal of the emergency evacuation lighting fixture is connected to the output terminal of the DC power distribution device.

2. The emergency lighting power supply system as described in claim 1, characterized in that, The system also includes: An AC power distribution system, wherein the AC power distribution system is provided with at least two circuits; An AC power switching device includes at least two AC input terminals, each corresponding to an AC power distribution source, with each AC input terminal connected to a corresponding AC power distribution source; the output terminal of the AC power switching device is connected to the input terminal of the three-phase AC bus.

3. The emergency lighting power supply system as described in claim 1, characterized in that, The system also includes: The first battery is connected to the first DC input terminal via the first battery; the input terminal of the first battery is connected to the output terminal of the rectifier, and the output terminal of the first battery is connected to the first DC input terminal.

4. The emergency lighting power supply system as described in claim 1, characterized in that, The photovoltaic DC power supply includes: A photovoltaic power generation device, wherein the output voltage of the photovoltaic power generation device is matched with the output voltage of the rectifier; The second battery has its input terminal connected to the output terminal of the photovoltaic power generation equipment, and its output terminal connected to the second DC input terminal.

5. The emergency lighting power supply system as described in claim 1, characterized in that, Multiple DC power distribution devices are provided, and the input terminal of each DC power distribution device is connected to the output terminal of the DC bus. Multiple emergency evacuation lights are provided, and each emergency evacuation light corresponds to a DC power distribution device. The input terminal of each emergency evacuation light is connected to the output terminal of a corresponding DC power distribution device.

6. The emergency lighting power supply system as described in claim 1, characterized in that, The system also includes: A backup AC power distribution device, wherein the input terminal of the backup AC power distribution device is connected to any one of phases A, B, and C of the output terminal of the three-phase AC bus; A backup lighting fixture, the input terminal of which is connected to the output terminal of the backup AC power distribution device.

7. The emergency lighting power supply system as described in claim 6, characterized in that, The backup AC power distribution device is provided in multiple ways, and the input terminal of each backup AC power distribution device is connected to any one of phases A, B and C of the output terminal of the three-phase AC bus. Multiple backup lighting fixtures are provided, and each backup lighting fixture corresponds to a backup AC power distribution device. The input terminal of each backup lighting fixture is connected to the output terminal of a corresponding backup AC power distribution device.

8. The emergency lighting power supply system as described in claim 6 or 7, characterized in that, The rated voltage of the backup lighting fixture is AC220V, and the rated voltage of the emergency evacuation lighting fixture is DC24V.

9. The emergency lighting power supply system as described in claim 1, characterized in that, The input voltage of the rectifier is AC220V, and the output voltage of the rectifier is DC24V.

10. An emergency lighting power supply box, characterized in that, It is compatible with the emergency lighting power supply system according to any one of claims 1-9.

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