Chapter 4. FUNCTIONING OF EQUIPMENT

TM11-6130-381-14

CHAPTER 4

FUNCTIONING OF EQUIPMENT

4-1. Basic Ac Phase-Controlled Current Regulator

conduction time of Q6001 and Q6002. Figure 4-2

shows the voltage waveform at the cathodes of

a. Figure 4-1 is a simplified schematic diagram

r e c t i f i e r s Q6001 and Q6002 with respect to

of a basic ac phase-controlled current regulator.

T 6 0 0 1 . The dc component of the voltage is

The voltage for the charging current to the battery

proportional to the conducting angle. The dc

is supplied by the bridge circuit, made up o f

current in the charging path is determined by the

CR6006, CR6007, and silicon-controlkd rectifiers

differece between the sum of the dc component of

Q6001 and Q6002. Inductor L6001 filters the

the rectified voltage and the battery voltage,

charging current to the battery, and CR6005 is a

divided by the resistance in the charging path. As

commutating diode that provides a current path

the battery voltage changes (or the ac line voltage

between L6001 and the battery when silicone-

changes), the conduction angle of the silicon

controlled rectifiers Q6001 and Q6002 are not

controlled rectifier is varied so that a constant

conducting. Resistor R6009 (fig FO-1) removes

current is maintained through the battery.

inductive transients from L6001. The dc current

through the battery is controlled by varying the

4-1