Figure 2-7. Minor Composite Waveshape.

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