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Answer Posted / sugat
The difference's between an inverter and a UPS are as follows
1) CHANGE OVER TIME: An off-line ups (the standard) switches
to the batteries in 3 to 8 milliseconds, after the main
power has been lost.
The typical Inverter changes over in about 500 milliseconds
2) SIZE: Off-line UPS's go up to about 2kVA
Inverters go to 16kVA, 3 phase(what i could find browsing)
3)VOLTAGE REGULATION: UPS's have automatic voltage
regulation (AVR) set on average at 220v
Inverters output voltage is the same as the mains input
voltage (South Africa = 230V)
An inverter can transform a voltage from say 12volts dc and
up to 230v AC.
UPS means Uninterrupted Power Supply. If you use an UPS
between your computer, and your socket in the wall, and
experience a power failure, the UPS will act as a battery
and give you some extra minutes work time to save your work,
and turn of the machine properly. Without the UPS your
machine would die immediately.
*note: the UPS is NOT a normal battery, so you cant put a
battery between your computer and the mains.
2) The basic
difference in layman's terms is:
While both provide backup power during mains outage, with
the UPS the switch is instantaneous whereas with the
Inverter there is a gap of a second or two. This gap is OK
for household gadgets such as lights, fans, fridge, etc. but
not OK for computers.
In technical terms:
UPS: The mains power comes to the UPS. The AC is converted
to DC and this DC is constantly charging the battery. The
output of the battery is fed to the Sine wave inverter and
it converts DC to AC and this feeds the equipment. Since
power out is always drawn from the battery, there is no time
lag when mains switches off; it just stops the battery from
being charged and the UPS continues to supply power till the
battery runs out.
Inverter: The mains powercomes to the Inverter. This is
directly sent to the output but the AC is also converted to
DC and this DC is constantly charging the battery. A sensor
and relay mechanism checks whether the mains is ON or OFF.
When the main switches OFF, the relay actuator triggers to
switch from mains to inverter. Rest is same like the UPS.
Because of this sensor and relay, there is a gap between
triggering.
UPS involves more costly circuits and is therefore more
expensive to make and sell.
Apart from these there is another difference. The AC supply
has a pure sine wave whereas in an offline UPS the output is
a near sine wav, not a pure sine wav where as for a inverter
its step wave. This is the reason that we hear a hum when we
attach a inductive load to a UPS or a inverter but we do not
hear anything when its on AC supply.
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Sir, Plz send the last 5 yrs ques papers for Railway board's section engineer post. Thanks, c_k_chand@yahoo.co.in
