Uninterruptible power supply with adjustable output voltage

Abstract

The invention discloses an uninterruptible power supply with adjustable output voltage, which comprises a main power line, a bypass power line and a maintenance bypass power line, the main power line, the bypass power line and the maintenance bypass power line are connected in parallel, the main power line is connected with a main switch in series, the bypass power line is connected with a bypass switch in series, and the maintenance bypass power line is connected with the bypass switch in series. A maintenance bypass switch is connected to the maintenance bypass power line in series, one end of the main path power line is connected with a power input end, the power input end is electrically connected with an external input power supply, and a rectifier, a direct current bus, an inverter, a filter and an isolation transformer are arranged on the main path power line. Aiming at the condition that standard voltages of equipment in different countries in an industrial place are different, the related uninterruptible power supply can carry out conversion of output voltage grades and output voltage frequencies of different national standards according to user requirements, and meanwhile, the modulation ratio of SPWM control is prevented from being reduced, and the quality of the output power supply is prevented from being reduced.

Description

technical field [0001] The invention relates to the field of uninterruptible power supplies, in particular to an uninterruptible power supply with adjustable output voltage. Background technique [0002] In industrial production, it is necessary to equip important equipment with uninterruptible power supply devices in order to ensure that power failures do not cause harm or cause major economic losses. [0003] With the development of economic globalization, the import and export of industrial equipment from different countries is increasing day by day. Industrial equipment from different countries is often used, and the voltage standards of each country are different. At present, there are generally two types of indoor voltage (single-phase) used in countries around the world, namely AC 100V-130V and AC 220-240V. 100V and 110-130V are classified as low voltage, such as the voltage on board in the United States, Japan, etc., and the emphasis is on safety; 220-240V is calle...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an uninterruptible power supply with adjustable output voltage. The uninterruptible power supply device can be adjusted by the output voltage level and frequency so that it can match the voltage standards of major countries in the world, and at the same time solve the problem of excessive modulation ratio during SPWM control. Low, the problem that the quality of the output power of the inverter is degraded

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