Uninterruptible power supply system and method

Abstract

An uninterruptible power supply system outputs multiple backup voltages when power equipment is powered off, and includes a common bus and multiple UPS devices, the common bus integrates the multiple backup voltages, and has a maximum voltage The backup voltage of the value is used as a dominant voltage. Each UPS device detects its own backup voltage and determines whether it has received a power recovery signal from the power supply device. If so, each UPS device starts to make its own backup voltage. The backup voltage presents a downward trend, and in the downward trend, according to a comparison result between the master voltage and its own backup voltage, the backup voltage of itself is increased or decreased; thereby, the backup voltage of each UPS device is The voltage continuously and dynamically follows the dominant voltage to avoid the voltage disturbance caused by the asynchronous shutdown of the backup voltage when the power is restored, thereby improving the stability and reliability of the power supply.

Description

technical field [0001] The present invention relates to a system and method for emergency or backup power supply, in particular to an uninterruptible power supply that avoids the voltage disturbance caused by asynchronous shutdown of the backup power supply when the power is restored, thereby increasing the stability and reliability of the power supply. Supply systems and methods. Background technique [0002] refer to figure 1 , DC type uninterruptible power supply device (hereinafter referred to as DC type UPS device) is a device that electrically connects an AC / DC power supply 11 and a load 100, and the AC / DC power supply 11 receives an AC mains power and converted into a DC power, which is supplied to the load 100 via a DC bus 13, and the main purpose of the DC UPS device is to receive the DC power storage in advance when the mains power is in normal operation. When the mains power is abnormal, such as a power outage, the DC UPS device will replace the AC and DC power ...

AI Technical Summary

Problems solved by technology

[0004] However, if the DC UPS device 121 and the DC UPS device 122 cut off the output backup voltage instantaneously, it will cause voltage disturbance on the DC bus 13; in addition, the DC UPS device 121 and the DC UPS device 121 The UPS device 122 cannot know that the mains power is restored at the same time, so that the DC UPS device 121 and the DC UPS device 122 are as follows: figure 2 As shown, the timing of shutting off the output power is inconsistent, which will easily worsen the voltage disturbance of the DC bus 13, and cause the instantaneous load of the DC UPS device 121 and the DC UPS device 122 to be too large. Therefore, how to improve the existing uninterruptible power supply The lack of power supply technology is a problem that needs to be solved urgently

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