Quantcast Figure 2-7. Minor Composite Waveshape.

 

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Figure 2-5. Quasi Waveshape for Each Phase.
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TM-11-6125-259-30 Inverter Power Static PP-7274C/A Manual
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Chapter 3. DIRECT SUPPORT MAINTENANCE INSTRUCTIONS
TM-6125-259-30
forward bias transistor Q300. This completes the
When the logic level of point
is positive,
circuit for current to flow through transistor Q305,
transistor Q41O will conduct throuh transformer
through primary winding (phase A) of transformer
T405 in such a direction that the polarity dots will
T2, through transistor Q300 to ground. These
be positive. This positive will forward bias tran-
Conditions remain unchanged for a duration of 60
sistor Q305. At the same tme the logic level of point
degrees at which time point  goes negative
is positive (point
is negative) causing
(point
goes positive) applying ground to both
transistor Q406 to conduct through transformer
sides of primary winding phase A of transformer T2
T409 in such a direction that the polarity dots will
current flow static). This condition will last for 30
be positive. This positive will forward bias tran-
degrees at which time point
again goes positive
sistor Q3O1 applying 37 vdc to both sides of primary
and current flow is resumed. This condition will
winding (phase A) of transformer T2 (current flow
prevail for an additional 30 degrees at which time
static). This condition will last for 30 degrees of a
both points
and
change logic levels
360 degree cycle. Then the logic level at point
causing the current flow to reverse direction. By
will switch causing transistor Q407 to
and
continuing the above process a quasi waveshape as
conduct (Q406 will cut off) through transformer
T403 in such a direction that the ends opposite the
shown in figure 2-7 will be produced.
polarity dots will be positive. This positive will
Figure 2-7. Minor Composite Waveshape.
The major and minor composite waveshaes are
capacitors, they produce the 115 vrms output sine
wave.
superimposed and after filtering by the chokes and
2-10

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