RU148644U1 - UNINTERRUPTIBLE POWER SUPPLY WITH DC CONVERTER - Google Patents

Abstract

1. An uninterruptible power supply device, which contains at least one input for connecting single-phase and / or three-phase alternating current lines, which is connected to rectifiers, the outputs of which are connected in parallel, and connected to a 48 V DC bus, which is connected as with at least one battery and an inverter system comprising at least one inverter module, which consists of at least two inverters for supplying a single-phase load or at least three inverters s for powering three-phase load, wherein the DC bus is connected to at least one DC voltage converter 48 into a direct current voltage of 24 V or 12 B.2. The uninterruptible power supply device according to claim 1, characterized in that it contains outputs for supplying loads of both direct and alternating current. The uninterruptible power supply device according to claim 1, characterized in that the outputs of the DC-DC converters are connected in parallel. The uninterruptible power supply device according to claim 1, characterized in that the outputs of the DC / DC converters have individual outputs.

Description

The proposed technical solution relates to electrical engineering, in particular to uninterruptible power supply devices (UBP and is intended for uninterrupted power supply of consumers with alternating and direct current).

It is known UBP (RU 79218 U1 IPC H02J 9/00 (2006.01), with priority dated 05/15/2008) containing at least 2 inputs for connecting single-phase or three-phase alternating current lines, each of which is connected to its rectifier module, containing no less than 2 rectifiers when connected to a single-phase line, or at least 3 rectifiers when connected to a three-phase line, and the outputs of the rectifier modules are connected in parallel and through a DC power device with at least one battery, connected to an inverter system containing at least 2 inverter modules connected in parallel and each of which consists of at least 2 inverters for supplying a single-phase load, or at least 3 inverters for supplying a three-phase load, alternating voltage from each of which is supplied to consumers of alternating current to the outputs of the device, galvanically isolated from the input lines. 5 cp f-ly, 2 ill.

The disadvantage of this UBP is the limited use, for example, powering external DC loads is possible only through installed external rectifiers for backup, which need to install additional batteries.

The technical result achieved by using the proposed UBP is:

- the possibility of organizing uninterrupted power supply of loads of both direct and alternating current using a single battery as a backup power source at the time of loss of the external network;

- there is no need to install external rectifiers and batteries;

- the ability to easily and quickly in time to form the necessary configuration of the power system (increase the power and / or capacity of the batteries, etc.) due to the simple, convenient, quick layout and “hot swap” of all power modules without turning off the device;

- reduces the need for additional electrical safety measures due to the low voltage of the DC bus (48 V), which is used alone, but with a double conversion topology;

- the ability to power three-phase devices when powered from a single-phase network through the use of double conversion topology with a single DC bus;

The indicated technical results are achieved by the proposed uninterruptible power supply device, which contains at least one input 1 for connecting single-phase and / or three-phase alternating current lines, which is connected to rectifiers 2, the outputs of which are connected in parallel, and connected to the DC bus 3 voltage 48 B, which is connected to at least one rechargeable battery 4 and an inverter system 5, comprising at least one inverter module, which consists of at least two inverters d For supplying a single-phase load or at least three inverters for supplying a three-phase load, and with at least one converter 8 of direct current voltage of 48 V to direct current voltage of 24 V or 12 V.

In a preferred embodiment of the UPS, it contains outputs for supplying loads of both direct 7 and alternating current 6.

In another preferred embodiment, the UBP outputs of DC / DC converters of more than one are connected in parallel.

In a more preferred embodiment, the UBP outputs of the DC / DC converters more than one have an individual output.

It will be apparent to those skilled in the art that the preferred embodiment of the UPS is a special case and depends on the component to be assembled while the base of the UPS remains constant.

The essence of the uninterruptible power supply is illustrated by the functional diagram in figure 1, where

1 - input for connecting lines of single-phase and / or three-phase alternating current,

2 - rectifiers,

3 - DC bus,

4 - battery

5 - system of inverters,

6 - output for powering AC loads,

7 - output for supplying DC loads,

8 - converters.

The uninterruptible power supply device, based on a specific example of FIG. 1, is made according to the principle of a modular design with a variable composition of the main functional (power) blocks and rectifier elements 2 and the inverter system 5 and the possibility of a complete data backup of the main functional (power) devices (rectifiers and inverters), due to the presence in each block of an excessive number of the indicated functional (power) devices (rectifiers and inverters) N + 1, and consists of:

- rectifiers 2, the outputs of which are connected in parallel, are connected to the power feeder. The total number of rectifiers is determined by the load power of the consumer. Under normal conditions (in the presence of voltage), the rectifiers convert the alternating voltage of the network into direct voltage, which is supplied to the system of inverters 5, batteries and DC / DC converters 8.

- The inverter converts the constant voltage back into a variable output voltage that is stabilized in frequency and amplitude, which is then fed through the output 6 to the consumers of alternating current. If there is no input voltage, the inverter is powered by battery 4. After the power is restored, the rectifier automatically takes over the inverter's power and charges the battery.

- DC / DC converters 8 converts a 48 V voltage to a 24 or 12 V DC voltage.

The UPS has the function of automatic and manual bypasses Q1 providing direct connection of the load to the busbar in case of inverter malfunction. The automatic bypass switches are high-speed keys located inside the inverters. Manual bypass switches are cam switches with additional low-current contacts that reflect the true position of these switches.

Work UBP.

The UPS is powered from a four or five-wire network of three-phase alternating current 380 V (permissible deviations + 30 / -40%) with a frequency of 50 Hz (permissible deviations + 2.5 / -2.5%) or from a single-phase alternating current network with voltage 220 V ( permissible deviations + 30 / -40%) with a frequency of 50 Hz (permissible deviations + 2.5 / -2.5%). If the network deviates beyond the specified parameters, the power is supplied from the battery, while in case of voltage dips, the transition to the load power from the battery does not impair the quality of functioning.

UBP can withstand without damage pulsed overvoltages in each phase up to 4000 V with duration up to 50 μs.

Under normal conditions (with a working power supply), the UPS will receive power from external power supplies. UBP rectifiers convert to direct voltage, which is supplied to inverters and batteries.

Inverters convert the DC voltage back into a frequency and amplitude-stabilized output AC voltage, which is then fed to AC consumers. In the absence of input voltage, the inverter is powered by batteries. After the power is restored, the rectifier automatically takes over the power of the inverter and, in addition, charges the battery again, so that in the event of a reverse voltage failure, the power is supplied back to the batteries.

The connection of 24 and 12 V voltage converters to the DC bus with redundant power supply from the batteries allows guaranteed supply of DC loads without additional conversions, which reduces conversion losses and the amount of equipment used. There is no need to use batteries to reserve voltage 24 and 12 V.

The presence of a DC voltage converter allows you to power DC loads without additional switching and conversion devices.

Claims (4)

1. An uninterruptible power supply device, which contains at least one input for connecting single-phase and / or three-phase alternating current lines, which is connected to rectifiers, the outputs of which are connected in parallel, and connected to a 48 V DC bus, which is connected as with at least one battery and an inverter system comprising at least one inverter module, which consists of at least two inverters for supplying a single-phase load or at least three inverters s for powering three-phase load, wherein the DC bus is connected to at least one transducer in the DC to DC 24 V DC 48 V or 12 V. 2. The uninterruptible power supply device according to claim 1, characterized in that it contains outputs for supplying loads of both direct and alternating current. 3. The uninterruptible power supply device according to claim 1, characterized in that the outputs of the DC-DC converters are connected in parallel. 4. The uninterruptible power supply device according to claim 1, characterized in that the outputs of the DC / DC converters have individual outputs.

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