UPS (Uninterrupted Power Supply) with inverter serving as active filter

A source filter and inverter technology, applied in the field of UPS where the inverter doubles as an active filter, can solve problems such as low system efficiency, impact on the power grid, loss, etc., to improve system efficiency, improve switching time, The effect of ensuring the quality of power supply

Pending Publication Date: 2022-07-01
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the double conversion mode of AC-DC and DC-AC of online UPS will cause a large loss in the system. The highest efficiency of common high-frequency online UPS in double conversion mode is generally around 96%.
Based on the current increasingly stringent environmental protection requirements and energy-saving regulations, more customers use ECO mode when using online UPS. The principle of ECO mode is that the UPS supplies power to the back-end load through the bypass, and the UPS inverter is in hot backup. state, switch to the inverter power supply when the bypass is abnormal, the advantage of the ECO mode is that the system efficiency can be as high as 99%, the disadvantage is that the mains is directly connected to the load, and the harmonics generated by the load will affect the power grid, and the bypass in the ECO mode Although the switching time between the circuit and the inverter is short, there is also a switching time of nearly 2ms, which is difficult to meet some precision equipment loads that have strict switching time requirements
[0003] Therefore, the existing UPS has the problem that the system efficiency is not high in the inverter mode, and the load harmonics affect the power grid in the ECO mode.

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  • UPS (Uninterrupted Power Supply) with inverter serving as active filter
  • UPS (Uninterrupted Power Supply) with inverter serving as active filter
  • UPS (Uninterrupted Power Supply) with inverter serving as active filter

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Embodiment Construction

[0018] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0019] The invention relates to a UPS with an inverter also serving as an active filter. A bypass judging device for generating a bypass mode signal or a main circuit mode signal from the circuit voltage and frequency, the input end of the inverter is connected to the commercial power conversion device and the DC conversion device, and the output end is directly connected to the output end of the UPS, The control device controls the inverter to operate as an active filter based on the bypass mode signal and to operate as an inverter based on the main path mode signal. The inverter of the ...

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Abstract

The invention relates to a UPS (Uninterrupted Power Supply) with an inverter serving as an active filter, which comprises a bypass device, a mains supply conversion device, a direct current conversion device, the inverter, a control device and a bypass judgment device, wherein the bypass judgment device is used for detecting a bypass voltage frequency and generating a bypass mode signal or a main path mode signal based on the bypass voltage frequency; the input end of the inverter is connected with the commercial power conversion device and the DC conversion device, the output end of the inverter is directly connected with the output end of the UPS, and the control device controls the inverter to work as an active filter based on the bypass mode signal and to work as an inverter based on the main mode signal. When the UPS with the inverter serving as the active filter works in a bypass mode, the inverter serves as the active filter, the system efficiency is effectively improved, the load power supply quality is guaranteed, the output end of the inverter is directly connected with the output end of the UPS, a static switch is omitted, and the bypass inversion switching time is greatly shortened.

Description

technical field [0001] The present invention relates to the field of UPS, and more particularly, to a UPS with an inverter serving as an active filter. Background technique [0002] Uninterruptible power supply (UPS, Uninterruptible Power Supply)) is divided into online UPS, offline UPS and online interactive UPS. When the online UPS is inverting power supply, it uses the double conversion mode to convert the AC input from the mains into DC, and then convert the DC inverter to AC output to the back-end load. Therefore, while the online UPS provides the function of uninterruptible power supply, it also isolates the mains from the load, so that the mains is not affected by the harmonics generated by the load. However, the AC-DC, DC-AC double conversion mode of the online UPS will cause a large loss of the system. The common high-frequency online UPS, the maximum efficiency of the full load in the double conversion mode is generally about 96%. Based on the current increasingl...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H02J9/06H02J3/01
CPCH02J9/062H02J3/01
Inventor吴彬嵇文华燕峰郑书路黄华冯裕谢威
OwnerEMERSON NETWORK POWER CO LTD