Parallel direct-current standby power supply

Abstract

The utility model provides a parallel direct-current standby power supply, which comprises a charging part and a power storage part, the charging part and the power storage part are both connected to a bus, and when a direct-current power supply charger fails and a storage battery is in an open circuit, the standby power supply can be in seamless connection, so that the safety of a power grid system is ensured; a direct current monitoring module is installed on a control bus of the charging part, accurate monitoring and efficient management of the charging process are achieved, the charging efficiency is improved, and the service life of a battery is prolonged; storage battery packs of the power storage part are connected in parallel and are connected with a DC / DC module, so that the overall reliability of the backup power supply is improved, meanwhile, the number of storage batteries connected in parallel can be flexibly increased or decreased according to actual load requirements, and the expansion and upgrading of the system are facilitated; the diode module assembly is arranged between the control bus and the field bus, so that reverse flow of current can be prevented, other electronic elements are protected from being damaged by reverse current, and stable operation of the whole charging system is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of backup power technology, specifically relating to a parallel DC backup power supply. Background Technology

[0002] As modern society becomes increasingly reliant on electricity, especially in the event of grid failures, natural disasters, or in remote areas, ensuring the continuity and stability of power supply becomes crucial.

[0003] In some power supply applications, it is required that backup power can seamlessly take over when DC power chargers fail or batteries are open-circuited, to ensure the safety of the power grid system; when backup power is in operation, requirements are also placed on its reliability and scalability. Utility Model Content

[0004] The purpose of this utility model is to provide a parallel DC backup power supply to overcome the technical problem that the backup power supply cannot be seamlessly connected when the existing DC power supply fails.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A parallel DC backup power supply includes a charging section and an energy storage section connected to each other. An ammeter and a voltmeter are installed in the charging section, and an ammeter is installed in the energy storage section.

[0007] The charging section includes at least one charging module. The input end of the charging module is connected to an AC input unit, and the output end of the charging module is connected to a DC power supply line. The other end of the DC power supply line is connected to a control bus. A bus ammeter, a bus voltmeter, and a DC monitoring module are installed on the control bus.

[0008] The energy storage section includes multiple battery packs connected in parallel. The battery packs are connected to the control bus of the charging section via a DC / DC module.

[0009] A diode module assembly is also installed on the control bus.

[0010] Furthermore, the AC input unit includes a three-phase AC input line, one end of which is connected to the input port of the charging module.

[0011] Furthermore, the AC input unit also includes an AC monitor, which is connected to the three-phase AC input line.

[0012] Furthermore, a surge arrester is installed at the input end of the charging module, with one end of the surge arrester connected to an air switch and the other end grounded.

[0013] Furthermore, an air switch, a first shunt, a first ammeter, and a first voltmeter are installed on the DC power supply line.

[0014] Furthermore, a control switch, a second shunt, and a second ammeter are installed between the control bus and the DC / DC module.

[0015] Furthermore, a fuse is provided between the DC / DC module and the battery pack.

[0016] Furthermore, a battery inspection device is also installed at the battery pack.

[0017] Furthermore, the battery pack has four units.

[0018] Furthermore, the parallel DC backup power supply is integrated into the cabinet.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] This invention provides a parallel DC backup power supply, comprising a charging section and an energy storage section, both connected to a busbar. In the event of a DC power charger failure or battery open circuit, the backup power supply can seamlessly take over, ensuring the safety of the power grid system. Furthermore, a DC monitoring module is installed on the control busbar of the charging section, collecting data in real time via a communication-enabled meter and transmitting it to a DC monitoring device. This enables precise monitoring and efficient management of the charging process, preventing overcharging and undercharging, and improving charging efficiency and battery lifespan. The battery banks in the energy storage section are connected in parallel and to a DC / DC module. If one battery bank fails, the remaining battery banks can continue to supply power to the load, improving the overall reliability of the backup power supply. The number of parallel batteries can be flexibly increased or decreased according to actual load requirements, facilitating system expansion and upgrades. A diode module assembly is installed between the control busbar and the field busbar to prevent reverse current flow, protecting other electronic components from damage by reverse current and ensuring the stable operation of the entire charging system.

[0021] Preferably, the AC input unit adopts a three-phase AC input line. Compared with single-phase input, three-phase AC power can provide greater power, meet the power demand of the charging module, and improve charging efficiency and power supply capacity.

[0022] Preferably, an AC monitoring module is connected to the three-phase AC input line, which can monitor the parameters of the three-phase AC input in real time, detect abnormalities in the AC input power supply in a timely manner, and improve the stability and reliability of the system.

[0023] Preferably, a surge arrester is installed at the input end of the charging module and connected through an air switch, with the other end grounded, which can effectively prevent damage to the charging module caused by overvoltage phenomena such as lightning strikes.

[0024] Preferably, a battery inspection device is installed at the battery pack, which can monitor and inspect the voltage, temperature and other parameters of each battery in the battery pack in real time, which facilitates the maintenance and handling of the battery pack and improves the overall performance and reliability of the battery pack. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a parallel DC backup power supply circuit according to an embodiment of this utility model;

[0026] Figure 2 A structural diagram of a parallel DC backup power supply cabinet in an embodiment of this utility model;

[0027] Figure 3 First-view structural diagram of the DC / DC module in this embodiment of the present invention;

[0028] Figure 4 Second-view structural diagram of the DC / DC module in this embodiment of the present invention.

[0029] Among them, 1. Screen cabinet; 2. DC / DC module. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection 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 invention based on the specific circumstances.

[0033] In one embodiment of this utility model, such as Figure 1 As shown, a parallel DC backup power supply is provided, including a charging section and an energy storage section, wherein the energy storage section is connected to the control bus of the charging section via connecting wires;

[0034] The charging section includes a charging module, which is an AC / DC module. The input end of the charging module is connected to the AC input unit, and the output end is connected to the DC power supply line, which is connected to the control bus.

[0035] An air switch 11ZK, a first shunt 11FR1, a first ammeter 11PA1, and a first voltmeter 11PV1 are installed on the DC power supply line.

[0036] The energy storage section includes multiple battery packs connected in parallel, and each battery pack is connected to the control bus via DC / DC module 2;

[0037] A DC monitoring module EMT1 and a bus voltage meter 11PV2 are installed on the control bus. A third shunt 11FR2 and a third ammeter 11PA2 are installed between the connection line between the charging module and the energy storage module and the control bus.

[0038] To prevent reverse current flow in the circuit, avoid potential damage to other components, and protect equipment in subsequent circuits, a diode module assembly is installed between the control bus and the field bus.

[0039] In one optional embodiment, the AC input unit includes a three-phase AC input line, with each charging module corresponding to a set of three-phase AC input lines. An AC input power input circuit breaker and an AC contactor are installed on the three-phase AC input lines. The three-phase AC input lines are connected to the input terminals of the charging modules. There are four charging modules, namely 11AD, 12AD, 13AD, and 14AD, all of which are AC / DC modules used to convert AC power to DC power output. Four control switches are set at the input ports of the charging modules to control the charging modules. The charging modules are connected to the DC power supply line through DC buses 1L+ and 1L-. An air switch 11ZK is also installed on the DC power supply line.

[0040] Optionally, the AC input unit also includes a protection module, which is connected to the input terminal of the charging module. The protection module includes a surge arrester 21F, one end of which is grounded and the other end is connected to an air switch 21QFS.

[0041] The electrical components on the connecting wires of the energy storage section include a control switch 11BK, a second shunt 21FR1, and a second ammeter 21PA1. To increase the safety of the line, a fuse 12FU is also installed on the connecting wires.

[0042] A battery inspection device, IPM-BM-S, is also installed at the battery location.

[0043] In one embodiment of this utility model, a parallel DC backup power supply is provided, including a charging section and an energy storage section. The energy storage section is connected to the control bus of the charging section via a connecting wire. The charging section includes a charging module, which is an AC / DC module. The input end of the charging module is connected to an AC input unit, and the output end is connected to a DC power supply line. The DC power supply line is connected to the control bus. An air switch 11ZK, a first shunt 11FR1, a first ammeter 11PA1, and a first voltmeter 11PV1 are installed on the DC power supply line. The energy storage section includes multiple battery packs connected in parallel. Each battery pack is connected to the control bus via a DC / DC module 2. A DC monitoring module EMT1 and a bus voltmeter 11PV2 are installed on the control bus. A third shunt 11FR2 and a third ammeter 11PA2 are provided between the connecting line between the charging module and the energy storage module and the control bus.

[0044] To prevent reverse current flow in the circuit, avoid potential damage to other components, and protect equipment in subsequent circuits, a diode module assembly is installed between the control bus and the field bus. The AC input unit also includes an AC monitoring module IPM-DM-A10. All three-phase AC input lines of each charging module are connected to the AC monitoring module, which is used for data acquisition, status detection, and communication of the AC section.

[0045] Optionally, a protection module, including a surge protector IPD1, is also provided on the connection line between the charging module and the energy storage module. One end of the surge protector is grounded, and the other end is connected to an air switch.

[0046] In another embodiment of this utility model, a parallel DC backup power supply is provided. A parallel battery charging cabinet is added next to the original DC cabinet 1. The cabinet is a standard 2260*800*600 unit, equipped with four AC / DC charging modules with a rated current of 10A each. The AC input current is two-way AC 380V, drawing power from the station's low-voltage AC system. The AC / DC modules are set to output DC 230V, and the DC / DC module 2 stably outputs DC 220V. The structure of the DC / DC module 2 is as follows... Figure 3 and Figure 4 As shown.

[0047] The system is configured with four DC / DC modules and eight 12V 100Ah lead-acid batteries. The technical parameters of the DC / DC modules are shown in Table 1: rated output DC220V 8A on the bus side and rated voltage DC24V on the battery side. Each DC / DC module connects to two batteries.

[0048] Table 1 Main Technical Parameters of DC / DC Modules

[0049]

[0050] The output of the DC backup power supply is connected to the field DC bus via a diode to prevent the field DC bus from supplying power to the backup DC system.

[0051] Under normal operation, the DC backup power supply output voltage is DC230V. After AC power failure, the DC backup power supply output voltage is DC220V.

[0052] The charging and energy storage sections of the DC backup power supply are integrated in cabinet 1. The layout and schematic diagram of cabinet 1 are shown below. Figure 2 As shown;

[0053] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A parallel type DC backup power source characterized by, The charging part and the storage part are connected with each other, a current meter and a voltage meter are installed in the charging part, and a current meter is installed in the storage part; The charging part comprises at least one charging module, an AC input unit is connected to the input end of the charging module, a DC power supply line is connected to the output end of the charging module, the other end of the DC power supply line is connected to a control bus, and a bus current meter, a bus voltage meter and a DC monitoring module are installed on the control bus; The storage part comprises a plurality of storage battery groups, the storage battery groups are connected in parallel, and the storage battery groups are connected to the control bus of the charging part through DC / DC modules (2); A diode module assembly is further installed on the control bus.

2. The parallel type DC backup power source according to claim 1, characterized by, The AC input unit comprises a three-phase AC input line, one end of the three-phase AC input line is connected to the input port of the charging module.

3. A parallel type DC backup power source according to claim 2, characterized by The AC input unit further comprises an AC monitor connected to the three-phase AC input line.

4. The parallel type DC backup power source according to claim 1, characterized by, An air switch is connected to one end of a lightning arrester installed at the input end of the charging module, and the other end is grounded.

5. The parallel type DC backup power source according to claim 1, characterized by, An air switch, a first shunt, a first current meter and a first voltage meter are installed on the DC power supply line.

6. The parallel type DC backup power source according to claim 1, characterized by A control switch, a second shunt and a second current meter are installed between the control bus and the DC / DC module (2).

7. The parallel type DC backup power source according to claim 1, characterized by A fuse is arranged between the DC / DC module (2) and the storage battery group.

8. The parallel type DC backup power source according to claim 1, characterized by, A storage battery inspection device is further arranged at the storage battery group.

9. The parallel type DC backup power source according to claim 1, characterized by, The storage battery group has four storage batteries.

10. The parallel type DC backup power source according to claim 1, characterized by, The parallel type DC backup power supply is integrated in the screen cabinet (1).

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