Figure 2-3. Inverter EMI Filter Schematic Diagram.

TM11-6125-259-30

Figure 2-3. Inverter EMI Filter Schematic Diagram.

flow (only discharge current flow) when transistor

When transistor Q700 or Q701 is turned on, trans-

Q700 and Q701 are turned on but the choke center

former T201 or T801 secondary winding 4-3 has

taps are shorted to ground when Q700 and Q701 are

current flow from the +15 volts through Q700 or

turned off.

Q701 to ground. This resets the respective trans-

former. Then when transistor Q700 or Q701 is

The detailed cycling of the boost circuit is: During

turned off, the energy stored earlier causes a back

cycle 1, choke L201 center tap is shorted to ground

EMF through secondarywinding 4-3 that flows

and choke L301 is unshorted and discharging into

through diode CR701 or CR702 to ground. This

capacitors C401A and B. During cycle 2, choke

current flow feeds a voltage into primary winding

L201 and L301 are unshorted and discharging into

1-2 of transformer T201 or T301 and supplies the

capacitors. During cycle 3, choke L301 center tap is

bias voltage which turns on power switch trans-

shorted to ground and choke L201 is unshorted and

istors Q206, Q207, Q208, Q306, Q307 and Q308.

discharging into capacitors. During cycle 4, chokes

Thus, choke L201 and L801 have no charge current

L201 and L301 are unshorted and discharging into

2-3