Online Double Conversion UPS System – Why It Is The Best.
Online Double Conversion UPS Systems are so called as they at first take your raw AC power and convert this into DC power. This is the first conversion stage. The inverter then takes DC power and then converts this into AC power. This is the second conversion stage and hence the term “double conversion”.
Other UPS System technologies do not use this method and instead the inverter will only operate when it is switched on. This gives other technologies the benefit of higher efficiency and quieter operation as the inverter does not require forced cooling.
When an offline or line interactive unit switches to battery operation there is a gap during this transition. This can be anywhere from 2 milliseconds if everything is in the UPS’ favour or as high as 20-50 milliseconds if it is not. A normal 50Hz mains power waveform has a cycle length of 20 milliseconds, so the best case we lose 10% of the power momentarily.
An Online UPS System has no such gap. The only change internally is that instead of the DC buss receiving power from the rectifier it receives power from the batteries. This change is undetectable on the output and there is zero transition time.
On other technologies, the mains power goes straight through. The inverter only comes into play when the mains voltage is out of tolerance. This means that there are variances in the output voltage. Even UPS that claim to offer Automatic Voltage Regulation or AVR do have varying output voltages from anywhere from 208 to 253V.
The online UPS output is independent of the input and delivers a newly created power waveform. The output voltage is constant and unchanging and in many cases can also be adjusted to meet your requirements.
Any distorted waveforms or variations in frequency are not blocked by line interactive or offline systems and feed these power problems directly to your load. The newly created power waveform in an online UPS System ensures that your load is provided with high quality power at all times.
In summary an online UPS System recreates a new power waveform that is clean, high quality and free of any power anomalies. This is why online double conversion UPS Systems are considered to be the only solution for critical power.
Power Inspired offer the full range of Dale UPS Systems and other Power Protection products.

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