UPS uninterruptible power supply principle and maintenance method

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

UPS uninterruptible power supply principle and maintenance method. At present, all weak electricity projects are equipped with UPS uninterruptible power, then UPS has failed, will you repair it? The UPS power supply is used as a protection of other objects, and its UPS power supply itself will often have some faults. If the UPS power is faulty, it cannot be supplied to the load supply.

In this article, I analyze the decomposition of UPS uninterruptible power supply. The UPS uninterruptible power supply works from the basic use, UPS is a power supply protection device containing the energy storage device, inverter as an important component, regulator, runoff output. Important consisting of rectifiers, batteries, inverters, and static switches.

1) Rectifier: Rectifier is a rectifier device, simply, converts AC (AC) to DC (DC) device. It has two important functions: turn the AC (AC) into a direct current (DC), supplied to the load, or the inverter is supplied; second, supply a charging voltage to the battery. Therefore, it also plays another charger; 2) Battery: The battery is used as a device for storing electrical energy, which is connected in series by several batteries, and its capacity size determines its maintenance discharge (power) time.

Its important functions are: 1 When the main electricity is normal, convert the electrical energy to chemical energy storage in the battery. 2 When the market is faulty, chemical can be converted into electrical energy supply to the inverter or load; 3) Inverter: Popular, inverter is a device that converts DC (DC) into AC (AC). It consists of inverter bridge, control logic and filter circuit.

UPS is also known as "uninterruptible power", is a system power supply device that converts DC electrically converted to transition power, is an indispensable part of communication, navigation, monitoring power guarantee, stable and uninterrupted power supply. In actual work, people's requirements for power supply have become more stringent, especially in some air-tubes such as automation, internalization, high accuracy and stability of power supply, and modern UPS Power technology is just in line with the corresponding requirements. Therefore, the principle and performance of UPS uninterrupted power supply have certain practical significance.

UPS uninterruptible power supply repair method 1, rear-pre-colurative UPS When the load is close to full load, the main power supply is normal, while the battery is fuse when the battery is powered. Fault decomposition: battery fuse blowing, indicating that the battery supply is too large, the test steps are as follows: 1 The inverter is breakdown; 2 The battery voltage is too low; 3 If the battery voltage is too low, the battery charging circuit is not normal. 4 If the battery charging circuit is normal, it is normal to test the battery voltage test circuit.

2, UPS can only be powered by the main electricity and cannot be converted to inverter power supply. Trouble Decomposition: Cannot perform the city-electrical inverter power conversion, indicating that the city's electrical inverter power supply conversion section has failed, and it is necessary to test: 1 battery voltage is too low, the battery fuse is not intact; 2 If the battery is normal, check The battery voltage test circuit is not normal; 3, the battery voltage is low, but the boot charging is more than 10 hours, the battery voltage is still filled. Fault Decomposition: Judging from the phenomenon as a battery or charging circuit fault, can be checked by: 1 Check the input and output voltage of the charging circuit is normal; 2 If the charging circuit is input is normal, the output is not normal, the battery is not measured, if still not Normal is a charging circuit fault; 3 If the charging circuit input is turned off, the output is normal, then the battery has been damaged due to the long-term uncharged, over-place or has arrived in the life.

4, the inverter power level pair of power amplifier transistors, after replacing the same model transistor, the reason for running for a period of time and burning is too large, but the original excessive current: 1 overcurrent protection invalid. When the inverter outputs an overcurrent, the overcurrent protection circuit is not used; 2 pulse width modulation (PWM) component fault, the output two complementary waveforms are asymmetrical, one is over, and the other is short. , Make the two arms work unbalance, even the two arms are turned on, causing two tube damage; 3 power tube parameters differ, at this time, even if the symmetrical waveform is input, the output will be asymmetrical, the waveform is output transformer, resulting in a bias Magnetic flux is unbalanced, accumulating to cause the transformer to saturate, the current increases, burns the power tube, and one burning, the other also burns bad.

5, the UPS is uninterruptible power supply, there is no display on the panel, UPS does not work. Fault Decomposition: Judgment from the fault phenomenon, its fault is in the mains input, battery and market electricity test part and battery voltage test circuit: 1 Check the city's electric input fuse is burning; 2 If the market is intact, check the battery insurance is not Burning, because some UPS will close all the output and display of the UPS when the battery is not in the battery voltage; 3 If the battery insurance is in good condition, check the city's electricity test circuit work is normal, if the market is not working properly and UPS does not have a market-free function, the UPS will also enclose all output and display; 4 If the city test circuit works normally, check the battery voltage test circuit is normal. Summary: The above is the principle and maintenance of UPS uninterruptible power supply.

The UPS power system uses the high intelligence and storage battery adopts a maintenance-free battery, which has brought many conveniences to use, but in the process of use, it should be noticed in many ways to ensure safe use.

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