In principle, the main difference between online UPS power supply and backup UPS power supply is that the backup UPS only stabilizes the mains power when there is mains power, and the inverter does not work, in a waiting state. When the mains power is abnormal, the backup Schneider UPS power supply will quickly switch to the inverter state, inverting the battery power into AC power. Therefore, the backup APC UPS power supply will have a conversion time of less than 10ms during the pilot reverse operation.
After the online APC UPS power supply is turned on, the inverter is always in working state, so there is no interruption time when the mains power is abnormally converted to battery discharge, that is, 0 interruption. The online APC UPS power supply adopts dual conversion technology, and the output power quality is high. Regardless of whether the mains power is normal or not, the entire power of the load is provided by the inverter. Due to the use of IGBT, the inverter will definitely adopt SPWM technology and try to increase the modulation frequency to reduce the output harmonic components. Through output feedback control, it can provide high-quality power supply voltage with high voltage stability, low waveform distortion, low frequency stability, and fast dynamic response speed to the load. The high-capacity APC UPS bus adopts an online dual conversion circuit topology.