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THEORY OF OPERATION
E-5 E-5
INVERTEC® V450-PRO
OUTPUT RECTIFIER
AND CHOKE
The output rectifier receives the AC output from the
main transformer secondary and rectifies it to a DC
voltage level. Since the output choke is in series with
the negative leg of the output rectifier and also in series
with the welding load, a filtered DC output is applied to
the machine output terminals. See Figure E.5.
FIGURE E.5 - OUTPUT RECTIFIER AND CHOKE
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
INPUT
CONTACTOR
INPUT
RECTIFIER
R
E
C
O
N
N
E
C
T
CONTROL BOARD
RIGHT
S
WITCH
BOARD
LEFT
S
WITCH
BOARD
MAIN
TRANSFORMER
C
URRENT
SENSOR
CHOKE
OUTPUT
TERMINAL
OUTPUT
T
ERMINAL
POWER
BOARD
115VAC
RECEPTACLE
P
O
W
E
R
S
W
I
T
C
H
I
N
P
U
T
B
O
A
R
D
FAN
MOTOR
AUX.
TRANS.
AUX.
TRANS.
R
ECTIFIER
A
UX.
RECONNECT
PRIMARY
CURRENT
SENSOR
WIRE FEEDER
R
ECEPTACLE
RS232
C
ONN.
THERMOSTATS
STATUS
LIGHT
THERMAL
LIGHT
CURRENT FEEDBACK
VOLTAGE FEEDBACK
65VDC
40VDC
CONTROL SIGNALS
PWM
DRIVE
CAPACITOR
VOLTAGE
FEEDBACK
CAPACITOR
V
OLTAGE
F
EEDBACK
PWM
DRIVE
VOLTAGE
S
ENSE
RECEPTACLE
#
1
#2
S
W
I
T
C
H
INPUT
CONTACTOR
INPUT
RECTIFIER
R
E
C
O
N
N
E
C
T
CONTROL BOARD
RIGHT
S
WITCH
BOARD
LEFT
S
WITCH
BOARD
MAIN
TRANSFORMER
C
URRENT
SENSOR
CHOKE
OUTPUT
TERMINAL
OUTPUT
T
ERMINAL
POWER
BOARD
115VAC
RECEPTACLE
P
O
W
E
R
S
W
I
T
C
H
I
N
P
U
T
B
O
A
R
D
FAN
MOTOR
AUX.
TRANS.
AUX.
TRANS.
R
ECTIFIER
A
UX.
RECONNECT
PRIMARY
CURRENT
SENSOR
WIRE FEEDER
R
ECEPTACLE
RS232
C
ONN.
THERMOSTATS
STATUS
LIGHT
THERMAL
LIGHT
CURRENT FEEDBACK
VOLTAGE FEEDBACK
65VDC
40VDC
CONTROL SIGNALS
PWM
DRIVE
CAPACITOR
VOLTAGE
FEEDBACK
CAPACITOR
V
OLTAGE
F
EEDBACK
PWM
DRIVE
VOLTAGE
S
ENSE
RECEPTACLE
#
1
#2
S
W
I
T
C
H
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