a backup ups

Abstract

The invention discloses a backup uninterruptible power supply (UPS). The backup UPS comprises a bus capacitance module, an inversion module, a changeover switch and a resistance device, wherein the resistance device is used for connecting a public end and a second end of the changeover switch, electric energy of a second power supply is provided for a load during bypass power supply, a rectification loop comprising diodes in the resistance device and the inversion module is used for charging the bus capacitance module, and at the moment, the voltage of a bus is gradually increased to a first voltage. Since the voltage of the bus is relatively high, a second voltage required by the inversion module is increased on the basis of the first voltage and is not needed to be started from 0 when bypass power supply is abnormal and a first power supply is needed to supply power, thus, the inversion module can be in a cold backup state, and the on-load loss of the UPS is reduced; and moreover, avoltage value of the bus is relatively high, so that inversion of the inversion module can be rapidly achieved when the bypass power supply is interrupted, the switching time is shortened to a great extent, and the power supply reliability of the UPS is improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a backup UPS. Background technique [0002] With the development of UPS technology, more and more fields need to use it, so the requirements for it are getting higher and higher. Especially for the backup UPS (hereinafter referred to as UPS), since the inverter does not work when the mains power is normal, it only starts to work when the mains power is cut off and the battery is discharged, so this kind of UPS is more energy-saving. The scope of application is also wide. [0003] figure 1 A structural diagram of a UPS provided in the prior art. Such as figure 1 As shown, the UPS mainly includes a boost module 10 , a bus capacitor module 11 , an inverter module 12 , a filter module 13 and an output relay 14 . The boost module 10 is mainly a boost circuit for boosting the input voltage. The bus capacitor module 11 mainly charges or discharges the bus capacitor module...

AI Technical Summary

Problems solved by technology

[0005] Obviously, the way in the prior art, even in the case of bypass power supply, also needs to control the booster module and inverter module in the UPS to be in the hot backup state, which increases the no-load loss of UPS when bypass power supply

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