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THEORY OF OPERATION
E-4 E-4
INVERTEC STT
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
FIGURE E.4 – SWITCH BOARDS
SWITCH BOARDS
There are two switch boards in the Invertec STT, each
containing an input filter capacitor. The capacitors are
connected in parallel when the machine is connected
for "low" input voltage. The capacitors are connected
in series when the reconnect switch is configured for
"high" input voltage. When the capacitors are fully
charged, they act as power supplies for the switch
boards. The switch boards contain the Field Effect
Transistors (FETs) which, when switched on, supply
the main transformer primary windings with DC current
flow. See Field Effect Transistor (FET) Operation
discussion and diagrams. See Figure E.4.
