DETAILED CIRCUIT DISCUSSION-CONT. - TM-11-5805-688-14-10277

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3010

5-641. The Q1 drive pulses from the +12-volt

the time a Q1 drive pulse is applied to them.

regulator circuit and the Q4 drive pulses from the

When the switches are on, energy is stored in the

+5-volt regulator circuits are applied through the

primary winding (pins 1 and 2) of transformer T1.

+12- volt driver card A3 to switches Q1, Q2 and

The amount of energy stored in the winding is

Q3, Q4. The Q5, Q8, and Q9 drive pulses are

proportional to the time that a drive pulse is applied

applied through +5-volt driver card A4 to switches

to the switches. When the drive pulse terminates,

Q5, Q6, Q7, Q8, and Q9, Q10. The operation of

Q1, Q2 are switched off and the energy is coupled

each of the four pairs of drive switches are

through the secondary windings (pins 7 and 8 for

functionally the same. Therefore only the +12-volt

+12 volts) (pins 3 and 4 for -12 volts) of

drive switches Q1, Q2 are described in paragraph

transformer T1 to the +12- and -12-volt filter

5-462.

circuits. The +12-volt output from T1 is filtered by

choke L1 and its associated components. The -

5-642. As shown on the +12-volt driver card

12-volt output from T1 is filtered by choke L2 and

schematic, the current feed- back voltage applied

its associated components.

to the +12-volt regulator circuit is developed across

emitter resistor R4 that is associated with switch

5-644. The four switch circuits for the four +5-volt

Q2. Capacitor C7 and diode CR2 on card A3 are

power supplies are identical and are functionally

part of the bias circuit for switch Q1, Q2. The Q1

the same as the +12-volt switch circuit described in

paragraph 5-462. In the generation of the +5-volt

drive pulse from the +12-volt regulator circuit on

regulated output, the four sets of switches (Q3

card A1 is applied through resistor R2 and

through Q10) are each pulsed at 90-degree

capacitor C6 to the base of switch Q1. The drive

intervals to provide a constant energy input to the

pulses for switch Q4 in one of the +5-volt power

+5-volt filter network. Each of the four drive pulses

supply circuits is also routed through this card.

applied to the four switch circuits have the same

The drive pulses for three of the +5-volt power

pulse widths to provide the same energy levels to

supply circuits are processed through similar

the filter network. The timing relationship of the

circuits on the +5-volt driver card.

four drive pulses are shown in figure 5-50. Choke

L3 and its associated components form the +5-volt

5-643.Switches Q1, Q2, as shown on the overall

filter network.

power supply schematic, are switched on during

5-176