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THEORY OF OPERATION
E-8 E-8
POWER WAVE 450
POWER BOARD
The Power Board provides gate drives for the FETs on
the Switch Boards. It does so based on the “turn-on”
signals it receives from the Control Board. One func-
tion of the Power Board is to isolate the Control Board
from the Switch Boards. The Power Board also pro-
vides the other printed circuit boards with the DC volt-
age supply they require.
FIGURE E.8 – POWER BOARD
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
CONTROL
BOARD
DISPLAY
BOARD
PROTECTION
BOARD
AUX.
TRANS
POWER
BOARD
CT
CONTACTOR
INPUT
INPUT
RECTIFIER
AND
RECONNECT
SWITCH
BOARD
FET
ASSEMBLY
SWITCH
BOARD
FET
ASSEMBLY
MAIN
TRAMSFORMER
OUTPUT
RECTIFIER
SHUNT
CHOKE POSITIVE
NEGATIVE
SNUBBER AND
LEADS
SENSE
LCD
DISPLAY
KEYPAD
OVERLAY
WATER
COOLER
PC
INTERFACE
INPUT
LINE
SWITCH
FAN
WF1 WF2
THREE
PHASE
INPUT
POWER
LEFT
RIGHT