Circuit apparatus applicable to middle and high power UPS

A circuit device, high-power technology, applied in the field of circuit devices of three-phase uninterruptible power supply UPS, can solve the problems of low output conversion efficiency, narrow input voltage range, poor grid adaptability, etc. Parts, cost reduction effect

Active Publication Date: 2006-07-26
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a circuit device suitable for medium and high power uninterruptible power supplies. In order to overcome the narrow input voltage range, poor adaptability to the power grid, low output conversion efficiency and large volume of the whole machine in the existing three-phase output UPS technology, The shortcoming of low conversion efficiency solves the problems existing in the prior art that the input power factor, total harmonic distortion of input current, and conversion efficiency of the whole machine cannot meet the limit values ​​specified in the YD / T1095 standard at the same time

Method used

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  • Circuit apparatus applicable to middle and high power UPS
  • Circuit apparatus applicable to middle and high power UPS
  • Circuit apparatus applicable to middle and high power UPS

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Embodiment Construction

[0029] The implementation of the technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings:

[0030] The uninterruptible power supply device of the present invention is composed of a rectifier and an inverter. What is different from the prior art is that the rectifier adopts a three-phase non-neutral line input double-switch three-level boost rectifier.

[0031]The double-switch three-level boost rectifier can use the direct rectification input of the mains or the input of the backup battery pack to boost the input voltage to a stable DC bus voltage. Since the DC bus voltage does not need to be directly connected in parallel with the backup battery pack, the regulated value It can be selected at not less than 380V+25% peak voltage 380×1.25×1.414=672V or more. And because the rectifier adopts a double-switch boost circuit, it can boost the lower limit of the 380V-25% mains voltage to a stable DC value, so...

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Abstract

This invention relates to circuit device suitable for middle and large power, which comprises one communion and one inverter, wherein, the said communion adopts double switch three level lift circuit composed of three-phase circuit composed of six diodes to input three-phase alternating fire line and to convert the three phase current into six wave impulse direct current; the two lift direct to direct current converter is located between the three-phase bridge circuit and two filter capacitor to output direct mother line voltage; each lift direct to direct converter is composed of one inverter inductance, one exchanger switch and one pair of diodes.

Description

technical field [0001] The invention relates to a circuit device in the field of uninterruptible power supply (UPS), in particular to a circuit device for a three-phase uninterruptible power supply UPS with an output power of 20-100 kVA. Background technique [0002] The current 20-100kVA medium and high-power three-phase output uninterruptible power supply (UPS) has been widely used in communication, industry, medical and other industries to provide power protection for important electrical equipment. The conversion power of three-phase UPS is large and consumes a lot of electric energy, so the input power factor of the equipment is required to meet the standard; in addition, there are many types of loads in three-phase UPS, including resistive, inductive, capacitive, rectified nonlinear loads and combinations of several loads. The UPS can adapt to various loads and has a strong overload capability, and the output is equipped with an isolation transformer to eliminate the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 武士越
Owner ZTE CORP
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