Offline UPS
Offline
UPS supply grid power to electrical and electronic devices during
normal power supply. It switches to battery power only during power
failures and other power problems. As the grid power is bypassed to the
load during normal power supply, it is known as Offline UPS. As the UPS
is used only during power problems it is also known as Standby UPS.
Offline UPS is also spelled as Off-Line UPS or Off Line UPS.
Apart from bypassing power to the load, Offline UPS also
charges
the connected batteries during normal power supply. The bypassing of
power results in exposing the load to electrical noises and surges.
Therefore, they are not recommended for very sensitive and critical
electronic devices. During power failures and other power problems, they
switch from grid power to battery power fast enough to prevent
computers from rebooting. The switch over time is usually between 2 to
20ms.
Online UPS
Online
UPS supply power to electrical and electronic devices from batteries
all the time. The UPS first converts grid power to charge the batteries
and then discharges the batteries to power the load. As the battery
power is supplied to the load at all times, it is known as Online UPS.
The grid power is converted from (Alternating Current) AC to DC (Direct
Current) to charge the battery and the battery power is converted from
DC to AC to power the load. Therefore online UPS is also known as Double
Conversion UPS.
As
Online UPS always provides power from the battery, the load always gets
clean power regardless of any power problems. Therefore, Online UPS is
recommended for sensitive and critical electronic devices. Online UPS
provide a layer of insulation or electric firewall. Any change in the
input voltage or frequency does not affect the output voltage and
frequency. Therefore, the load is shielded from all power problems.
No comments:
Post a Comment
Hmmmmm... what are you thinking? Do not forget to comment,It helps us to improve this blog and help us to make better. on