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TM-11-6125-259-30 Inverter Power Static PP-7274C/A Manual
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Figure 2-5. Quasi Waveshape for Each Phase.
TM 1-6125-259-30
figure 2-4. Waveshape Inputs from Logic Cicuits to Major Drive Section.
end of 120 degrees point
goes to zero and point
The waveshapes at points
and
are used to
goes Postive. Transistor Q405will now conduct
produce the composite waveshape for phase
reversing the direction of current flow in trans-
(points
and
produce Phase B, points
former T402 causing Transistor Q205 to cut off and
and
produce phase C). When the logic level of
transistor Q31 to conduct. When transistor Q204
point E is positive, transistor Q404 will conduct
conducts a circuit is completed through primary
through transformer T402 in such a direction that
the polarity dots will be positive. This positive will
winding (phase B) of transformer T1, through
transistor Q203 (turned on previously) to the 37 vdc
forward bias transistor Q205. At the same time the
power source. This condition will last for an ad-
logic level of point
is positive causing transistor
ditional 60 degrees (total 180 degrees at which time
Q401 to conduct through transformer T400 in such
point
goes to zero and point
goes positive
a direction that the ends opposite the polarity dots
causing transistor Q401 to conduct and transistor
will be positive. This positive will forward bias
Q400 to cut off which will reverse direction of
transistor Q200. We now have a complete circuit for
current flow in transformer T400. Transistor Q201
current to flow through transistor Q205, through
will conduct and transistor Q200 will cut off.
primary winding (phase A) of transformer T1,
transistor Q201 will provide 37 vdc through
through transistor Q200 to ground. This condition
primary winding (phase A) of transformer T1 (op-
will last for 120 degrees of a 360 degree cycle.
osite direction from previous current flow). By
During this 120 degree period the waveshape at
continuing the above process a quasi waveshape will
point went positive causing transistor Q402 to
be produced for each of the three phases as shown in
conduct through transformer. T401 in such a
direction that the polarity dots will be positive. This
positive will forward bias transistor Q203. At the
2-8

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