Uninterruptible power supply (UPS) method and equipment having active voltage adjustment

Abstract

The invention relates to UPS equipment. The UPS equipment comprises at least one power supply, at least one UPS device and a bus; the power supply receives commercial power voltage, and performs voltage conversion of the commercial power voltage so as to generate power supply voltage; the UPS device generates backup voltage; the bus outputs one of the power supply voltage and the backup voltage to a load, wherein the UPS device judges whether the power supply voltage is abnormal or not according to the level of the power supply voltage; if the power supply voltage is abnormal, the UPS device increases the level of the backup voltage to the power supply voltage, which is greater than the power supply voltage when the power supply voltage is abnormal, and outputs backup current to the load through the bus; furthermore, the UPS device gradually decreases the level of the backup voltage, and detects whether the level of the backup current is less than a pre-set current value or not, so that whether the power supply voltage is still abnormal or not is judged; the UPS device determines whether the backup current is supplied or not directly and actively; the fact that the power supply condition is known according to an external state signal from the power supply or the load is unnecessary; and the wiring and communication complexity can be lightened.

Description

technical field [0001] The present invention relates to a method and equipment for emergency or backup power supply, in particular to an uninterruptible power supply technology with active voltage adjustment. Background technique [0002] In recent years, with the rapid development of the information industry, data room equipment such as personal computers, communication equipment, workstations, etc. have higher and higher requirements for the safety and reliability of power supply. The Uninterruptible Power Supply (Uninterruptible Power Supply) device ( Hereinafter referred to as UPS device) then became an indispensable necessary equipment for maintaining stable power supply for electrical loads such as computers or communication equipment. [0003] refer to figure 1 , the existing DC uninterruptible power supply technology is: using a DC UPS device 11 to electrically connect an AC mains 12, a power supply 13 and a load 100, to receive power status signals from the three, ...

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Problems solved by technology

[0004] However, once the power status signal is interrupted, or the communication with the load 100 is disconnected, the DC UPS device 11 cannot know the power supply status, which may cause the AC mains 12 to lose power without the backup. Voltage is supplied to the load 100, or although the A

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