Basic knowledge: UPS power supply technology (1)

UPS is an independent power supply with high quality and high reliability. It is a static and uninterrupted power supply device for battery. It consists of a rectifier, an inverter, an AC static switch, and a battery pack. In normal times, the mains supply changes to DC for battery floating charging, And the inverter outputs high-quality AC purified power supply for important loads, so that it is not subject to the voltage, frequency, and harmonic interference of the mains supply. When the mains supply loses power for some reason, the system automatically switches to the battery pack, the battery is discharged, and the inverter supplies power to important loads.

Mandatory provisions in GB50052---1995 "design specifications for power supply and distribution system": "In the first-level load is particularly important load, in addition to the two power supply, should be added emergency power supply. "The diesel generator set can be used as an emergency power supply, but its response speed is too slow, which cannot match the modern communication and network information data stream. Therefore, some important departments and systems in the project must consider uninterruptible power supply UPS.

AC uninterruptible power supply system Power Supply

The AC uninterrupted power supply system should be designed and used in the following cases:

(1) high requirements on power supply reliability, when the standby power supply is automatically cast or the diesel generator set emergency self-start mode still cannot meet the requirements.

(2) When the voltage regulator and Frequency Stabilization devices cannot meet the requirements.

(3) It is necessary to ensure safe shutdown During sequential power outages.

(4) Real-time Control of the electronic computer system.

(5) When the computer system is running online.

Computer equipment requires a high quality of power supply, not only the use of uninterrupted power supply systems, but also the power supply voltage fluctuation within a certain range can work normally. Network data transmission equipment requires that the power supply voltage fluctuation be less than ± 5%.