The working principle of online interactive UPS power supply
UPS is a kind of equipment that can provide continuous voltage and stability for electrical equipment even in the case of mains power failure. A power supply unit with a high frequency AC output. UPS usually has an energy storage device. According to the working mode, output capacity, number of phases, etc., UPS power supply can be divided into many types. According to the working mode, it is divided into three categories: backup type, online interactive type and online type. Online interactive UPS, also known as interactive UPS, directly supplies power from the mains to the load when the mains is normal. In the event of a power failure, it is converted to the battery inverting power supply through the transfer switch.
The online interactive UPS power supply is a UPS device between the backup UPS and the online UPS. It concentrates the advantages of the backup UPS high efficiency and the online UPS power supply quality. The online interactive UPS power conversion time is 0.4 milliseconds. Generally, the online interactive UPS can be recommended for equipment with low requirements.
The online interactive UPS power supply directly supplies power to the load from the mains when the mains is normal. When the mains is low or high, it is regulated and output through the UPS internal voltage stabilization circuit. When the mains is abnormal Or in the event of a power failure, switch to the battery inverter for power supply through the transfer switch. It has the characteristics of wide input voltage range, low noise and small size, but there is also switching time. The online interactive UPS power supply combines the advantages of the backup type and the online type, and has the characteristics of low price, low maintenance cost in the later period, and 0ms conversion.
Advantages and disadvantages of online interactive UPS power supply
Compared with backup UPS, online interactive UPS has stronger protection function, and the inverter output The voltage waveform is good, generally a sine wave, and its biggest advantage is that it has strong software functions, which can easily access the Internet and carry out remote control and intelligent management of UPS. It can automatically detect whether the external input voltage is within the normal range. If there is any deviation, it can be boosted or stepped down by the voltage regulator circuit to provide a relatively stable sine wave output voltage.
And it can communicate with the computer through the data interface (such as RS-232 serial port), through the monitoring software, the user can directly monitor the power supply and UPS status from the computer screen, simplifying and convenient management work , and can improve the reliability of the computer system.
This kind of online interactive UPS concentrates the advantages of high efficiency of backup UPS and high power supply quality of online UPS, but its frequency stabilization performance is not very ideal, and it is not suitable for constant delay UPS power supply.
The difference between online interactive UPS and online UPS power supply
The online UPS power supply has a wide voltage range, two-stage conversion, regardless of the input amplitude. value or frequency changes, the output is a stable voltage and frequency. Online interactive UPS works in bypass in most cases, and when the input voltage or frequency changes, the output is the same as the input, which is far worse than the online UPS power supply.
