On Line Isolated DSP UPS
ON LINE UPS with Double Conversion technique means, input AC power is rectified and converted to DC power, which in turn is conditioned to charge the battery. This DC battery power is again converted to AC power. An isolation transformer is used to isolate battery and mains from the inverter output to provide clean and re-grounded power to the critical loads that are connected to the UPS.
There is no change over time as it is on all the time and no changeover takes place. Works with wide AC input voltage range and output is completely independent of input (voltage and frequency). Due to more number of conversions the efficiency is not as high as off line and line interactive designs.