There are three different varieties of UPS systems-standby
systems, line-interactive systems, and double conversion systems. Though they
are different, they have some things in common. They all have a battery bank,
charger, input circuitry and a DC/AC inverter. All these UPS models shell out a
voltage waveform depending on the type of its DC/AC inverter (pure sine wave or
modified sine).
The modified sine wave or square wave inverter, presented by
inverters manufacturers, is usually
used in low-priced UPS devices. This waveform comprises of zero-voltage zones
between every negative and positive half-cycle. Besides, various models have an
amplified voltage slew rate (rate-of-change) resulting in ringing between the
input elements of power supply and the output elements of the UPS that causes
current peaks and higher voltage. Certain square wave systems have slower
voltage slew rates and include extra output elements to decrease the
destructive ringing between the power supply and UPS. These work effectively
with the pure inductive loads like blenders and mixers, as well as the pure
resistive loads like heaters and lamps. But these do not work well with the
computer power supplies as they lead to the systems running hotter with reduced
efficiency and thus shorten the working life.
The sophisticated line-interactive and double conversion sine wave UPS models output excellent
quality sine wave that is really similar to a utility AC power sine wave. A
pure sine wave DC/AC inverter is chosen when it is employed with the server and
storage power supplies. To conclude, it is advised that in order to ensure maximum
protection during the sudden utility outages, a UPS that has a pure sine wave
inverter is used.
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