Multi-interface AC / DC standby power device

Abstract

The utility model relates to a multi-interface AC / DC standby power device. The standby power device comprises a DC bus. The output side of the standby power device is provided with a plurality of direct current standby power ports, and the plurality of direct current standby power ports are respectively connected with a direct current bus through independent DC / DC converters; the input side of the standby power device is provided with a plurality of different types of standby power batteries, an alternating current standby power supply and a photovoltaic group string; the standby battery and the photovoltaic group string are connected with the direct current bus through the corresponding DC / DC converter; and the AC standby power supply is connected with the DC bus through the DC / AC converter. Compared with the prior art, the power supply access type of the direct-current standby power is expanded, the service life of the standby power equipment is prolonged, and the defect that the voltage of the original direct-current standby power system is limited by the voltage of a battery is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of backup power, in particular to a multi-interface AC / DC backup power device. Background Art

[0002] Backup power supplies are an indispensable component of my country's communications and power industries, and are widely distributed across the country. With the continued rapid development of my country's economy, the comprehensive coverage of communications networks and power systems, as well as the safety and reliability of communications networks and power DC relay devices, are becoming increasingly important. Consequently, the number of backup power supplies in DC system devices is increasing significantly each year. Traditional DC backup power supplies use batteries directly as a DC power source, but due to their limited capacity, they are often only suitable for short-term emergency use. If the battery capacity is exceeded, the equipment will lose power, resulting in risks such as communication interruption and damage. Furthermore, current DC backup power equipment, due to the limited voltage range provided by the backup batteries, cannot meet the needs of complex scenarios and diverse equipment. Utility Model Content

[0003] The purpose of the utility model is to overcome the defects of the above-mentioned prior art and provide a multi-interface AC / DC backup power device.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A multi-interface AC / DC backup power device, the DC backup power device comprising a DC bus;

[0006] The output side of the backup power device is provided with a plurality of DC backup power ports, and the plurality of DC backup power ports are connected to the DC bus through independent DC / DC converters respectively;

[0007] The input side of the backup power device includes various types of backup batteries, AC backup power supplies, and photovoltaic strings;

[0008] The backup battery and photovoltaic strings are connected to the DC bus through corresponding DC / DC converters; the AC backup power supply is connected to the DC bus through a DC / AC converter.

[0009] As a preferred technical solution, the output voltages of the DC / DC converters corresponding to the DC backup power ports are different.

[0010] As a preferred technical solution, the DC / AC converter corresponding to the DC backup power port includes a DC / DC converter with adjustable output voltage using a Buck-Boost circuit.

[0011] As a preferred technical solution, the backup battery includes one or more of a lead-acid battery, a lithium battery, a flywheel battery and a hydrogen battery.

[0012] As a preferred technical solution, the multiple different types of backup batteries are connected to the DC bus through bidirectional DC / DC converters respectively.

[0013] As a preferred technical solution, the AC backup power supply includes a single-phase 220V AC backup power supply.

[0014] As an optimal technical solution, the AC backup power supply includes three 380V AC backup power supplies.

[0015] As a preferred technical solution, the DC / AC converter corresponding to the AC backup power supply is a DC / AC converter with a back-to-back full-bridge rectifier topology.

[0016] As a preferred technical solution, a surge protector is provided between the photovoltaic string and the DC bus.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) The backup power device provided by the present invention expands the types of power supply access for DC backup power. The backup power supply is connected through an ACDC or DCDC module, and can be connected to a variety of backup power sources. Various batteries including lithium batteries, flywheels, hydrogen batteries, etc. can also be connected through DCDC.

[0019] 2) This utility model uses one end of the DC / DC converter as the backup power interface, and the port voltage is adjustable, making it suitable for a variety of backup power applications. This effectively solves the problem that the voltage of the original DC backup power system is limited by the battery voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of a multi-interface AC / DC backup power device of the present utility model;

[0021] The numbers in the figure are as follows: 1. DC bus, 2. DC backup power port, 3. Backup battery, 4. AC backup power supply, 5. PV string. DETAILED DESCRIPTION

[0022] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0023] Example 1

[0024] The utility model provides a multi-interface AC / DC backup power device, such as Figure 1As shown, the device comprises a DC bus 1, several DC backup power ports 2, multiple different types of backup batteries 3, and corresponding DC / DC and DC / AC converters. The backup power device is connected to the multiple DC backup power ports 2 on the output side via the DC bus 1 via a DC / DC converter. On the input side, the backup power device is connected to the backup batteries 3 via a bidirectional DC / DC converter, to an AC backup power source 4 via a DC / AC converter, and to photovoltaic strings 5 ​​via a unidirectional DC / DC converter.

[0025] Specifically, the output voltages of the DC backup power ports 2 are different, wherein the output voltages of the corresponding DC / DC converters include 12V and 48V. It also includes a DC / DC converter using a Buck-Boost circuit, whose DC backup port voltage is adjustable and suitable for a variety of backup power applications.

[0026] The backup battery 3 can be one or more of a lead-acid battery, a lithium battery, a flywheel battery and a hydrogen battery. It uses a bidirectional DC / DC converter, which can realize peak regulation of AC energy with the AC interface when idle, thereby increasing the value of the backup battery when idle.

[0027] The AC backup power supply 4 includes a single-phase 220V AC backup power supply 4 and a three-phase 380V AC backup power supply 4, and the DC / AC converter of the AC backup power supply 4 is a DC / AC with a back-to-back full-bridge rectifier structure topology.

[0028] A surge protector is also provided between the photovoltaic string 5 and the DC bus 1 to prevent voltage fluctuations caused by lightning strikes on outdoor equipment from damaging components in the low-voltage backup power equipment.

[0029] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. A multi-interface AC / DC backup power device, characterized in that: The DC backup device comprises a DC bus (1); The output side of the backup power device is provided with a plurality of DC backup power ports (2), and the plurality of DC backup power ports (2) are connected to the DC bus (1) via independent DC / DC converters respectively; The input side of the backup power device includes a plurality of different types of backup batteries (3), an AC backup power source (4), and a photovoltaic string (5); The backup battery (3) and the photovoltaic string (5) are connected to the DC bus (1) via corresponding DC / DC converters; and the AC backup power supply (4) is connected to the DC bus (1) via a DC / AC converter.

2. The multi-interface AC / DC backup power device according to claim 1, characterized in that: The output voltages of the DC / DC converters corresponding to the respective DC backup power ports (2) are different.

3. The multi-interface AC / DC backup power device according to claim 1, characterized in that: The DC / AC converter corresponding to the DC backup power port (2) includes a DC / DC converter with adjustable output voltage using a Buck-Boost circuit.

4. The multi-interface AC / DC backup power device according to claim 1, characterized in that: The backup battery (3) includes one or more of a lead-acid battery, a lithium battery, a flywheel battery and a hydrogen battery.

5. The multi-interface AC / DC backup power device according to claim 1, characterized in that: A plurality of different types of backup batteries (3) are respectively connected to the DC bus (1) via bidirectional DC / DC converters.

6. The multi-interface AC / DC backup power device according to claim 1, characterized in that: The AC backup power supply (4) includes a single-phase 220V AC backup power supply (4).

7. The multi-interface AC / DC backup power device according to claim 1, characterized in that: The AC backup power supply (4) includes three 380V AC backup power supplies (4).

8. The multi-interface AC / DC backup power device according to claim 1, characterized in that: The DC / AC converter corresponding to the AC backup power supply (4) is a DC / AC converter with a back-to-back full-bridge rectifier structure topology.

9. The multi-interface AC / DC backup power device according to claim 1, characterized in that: A surge protector is provided between the photovoltaic string (5) and the DC bus (1).

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