 |
Double Conversion
Type (AC to DC & DC to AC) |
| |
 |
|
Pure Sine wave
output |
|
Rectifier,
inverter & static switch are main components
of industrial UPS modules. |
|
Rectifier |
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|
Incoming AC supply
is converted to DC through phase controlled rectifiers.
The rectifier operates according to the constant
voltage current limiting principle and shall incorporate
a "Soft Start" feature to gradually accept
load on initial energizing. |
|
Inverter (IGBT
Based) |
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|
This section converts the D.C.
power to a regulated A.C. The inverter employed
is of the PWM (Pulse Width Modulated) type. |
| |
|
IGBTS are used to switch the
DC supply at frequency 6KHz to 12KHz depending upon
the rating. By switching a train of pulse through
one IGBT bridge circuit and alternatively through
second IGBT circuit at the required output frequency,
the output sine wave build-up. |
|
Static Switch
|
| |
|
The static switch employs a
pair of back-to back thyristors. One set is in series
with the inverter output and another in series with
Bypass supply. |
| |
|
The static bypass switch is
provided to ensure that even in the event of an
inverter failure, the supply of power to the load
will be maintained automatically, and without break
by connecting it to the incoming Bypass supply. |
