OnLine Power Power Wave 4 - Manual (Page 19)

6005-145 Rev. A 1-8
1.3. Rectifier
The main function of a rectifier is to convert the AC input to DC power, and
supply it to the inverter. The inverter then converts the DC power to AC power
for the load. The ELI use the DC power to charge the batteries as well, which is
the most efficient method of charging.
ELIs in the sizes 10KVA to 100KVA use 6-pulse fully controlled rectification
(optional 12-pulse). An inductor is added before the rectifier to improve the
power factor, smooth the current waveform and eliminate the harmonic current.
The control circuit regulates the DC bus within 1%. Soft walk-in circuitry
(approximately 20sec.) and current limit circuitry is used to prevent over current
or instantaneous surge current.
Extra under-voltage and over-voltage protections are added to improve
reliability and to shutdown the rectifier in case of abnormal conditions. The DC
bus is adjustable to fit different types of batteries. The power component used in
the rectifier is specially selected to handle extreme high voltage and high
current. The rectifier is designed to operate under a wide range of AC input,
from 177 to 300VAC, to operate under the poor power conditions found in some
areas.
6-PULS E FULL CONTROL RECTIFIER
INPUT
RECTIFIER
BREAKER INDUCTOR
CAPACITOR
SCR
AC
OUTPUT
DC