How an online UPS works

2022-08-16

UPS is the English abbreviation of uninterruptible power system, which is an important equipment that can provide continuous, stable and uninterrupted power supply.

 

How an online UPS works

 

Online UPS is divided into high frequency UPS and industrial frequency UPS according to the circuit structure. The high-frequency UPS has a high carrier frequency (above 50kHz), and uses high-frequency inductors and high-frequency transformers as energy storage components. It has the advantages of small size, light weight, high input power factor, low noise, and low material cost. The input and output do not have any isolation measures, and the environmental adaptability and impact resistance of the whole machine are poor. Generally, it is suitable for applications such as small computer rooms or office spaces with good environment. The power frequency UPS has a low carrier frequency (8~16kHz), adopts stable and shock-resistant phase-controlled rectification technology and uses an inverter isolation transformer as a conversion energy storage element, and the input and output are well electrically isolated. Lower power frequency UPS can provide safer and more reliable protection than high frequency UPS, and has the outstanding advantages of good environmental adaptability, strong shock resistance and overload capacity, and long service life, so power frequency UPS is suitable for applications with harsh environmental conditions. occasion.

 

After the online UPS supplies power to the power grid normally, the voltage input to the power grid eliminates high-frequency interference from the power grid through the noise filter, obtains pure AC, enters the rectifier for rectification and filtering, converts the AC into smooth DC, and then enters the charger in two ways Charge the battery and the other side is powered by the inverter. The inverter converts the DC to 220V, 50Hz AC for the load.

 

How an online UPS works

 

In the event of a mains interruption, the AC input will be cut off and the rectifier will no longer work. At this time, the battery discharges and transfers the energy to the inverter, which converts the DC power in the inverter into AC power for the load. Therefore, for the load, the mains power no longer exists, but at this time the load can work normally and will not be interrupted due to the interruption of the mains.