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Section E-1 Section E-1
V205-T AC/DC
Theory of Operation .............................................................................................................Section E
General Description ....................................................................................................................E-2
Input Board and Bus Board........................................................................................................E-2
Main IGBT Inverter Board ...........................................................................................................E-3
Main Transformer ........................................................................................................................E-4
Output Module and Clamping Board..........................................................................................E-4
Output Module Transistor Board ...............................................................................................E-4
Superimposition Board ...............................................................................................................E-4
Control/Display Board.................................................................................................................E-5
High Frequency Board................................................................................................................E-5
Output Filter Board .....................................................................................................................E-5
Insulated Gate Bipolar Transistor (IGBT) Operation ...................................................................E-6
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
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