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Section E-1
Section E-1
V205-T AC/DC
Theory of Operation
.............................................................................................................Section E
TABLE OF CONTENTS
-THEORY OF OPERATION SECTION-
Superimposition
       board
Bus board
Fan
Input
board
  HF
board
Main IGBT
& Power board
    4
IGBT’s
Control board
Display & LED 
      board
888
Control
  Knob
   Gas
Solenoid
  DC blocking
capacitor board
     Main
Transformer
Output
 board
  Output
Transistor
  Module
Current
   Hall
 Device
 Output
Filter bd.
(bypass)
   (D + E)
Remote 2/4
Remote
75, 76, 77
A, B, C
24 VDC Remote 2/4 path (D + E)
turn on 
AC ckt.
+15, -15, +5
input volt meter
thermostat info
set info
input current meter
turn on PWM
HF control signal
+48, +24
 Input
Choke
_
+
RF coil
-48, +24,+15,-15,+5
reconnect info.
voltage feedback
high volt supply
turn on 
AC ckt.
current feedback
     IGBT
Thermostats
   Output
    Diode
Thermostat
Voltage Feedback
Current Feedback
AC DC Gate drive signals
24 VDC
48 VDC
Output
Choke
FIGURE E.1 – V205-T BLOCK LOGIC DIAGRAM