ON-LINE UPS with VFI technology (output voltage and frequency are independent of their input values) are characterized by double energy conversion. The input mains voltage is first converted to DC and this is subsequently converted to output AC voltage. The UPS keeps the batteries charged.
Switching to the mode of powering the load from the batteries takes place without interrupting the supply of electricity. High filtering of electrical faults is achieved by double conversion. networks and stabilization of the output voltage in case of fluctuating input voltage, which ensures a high quality of the output voltage.
On-line UPS provide a high degree of load protection. Due to their sophisticated features and overall power protection, they are suitable for critical loads such as professional workstations, servers and network equipment, industrial automation, security, telecommunication systems, smaller data centers.