
Circuit Description—Type 324
(A ) Q 621-B
(B) 0 6 2 1 -E
(C) Differential
voltage across R639
(waveform A — B)
(D ) Q 620-B
(E) Q 617-B
(F) Differential
voltage at
Q61 7-B with
respect to Q 617-E
(waveform E — B)
(G ) Voltage
across R615
(H ) Q 634-B
and Q 636-B
(I) Q 634-E
and Q 636-E
D61 0
conducts
Q 6 2 1
conducts
D 610 stops
conducting
D 637 and D638
Q621 stops
conduct
conducting
0 V
— 2 0 V
0 V
— 20 V
+ 2 V
0 V
0 V
— 2 V
0 V
— 2 0 V
+ 10 V
0 V
+ 0.2 V
0 V
+ 0 .2 V
0 V
+ 0.8 V
+ 0 .6 V
Fig. 3-4. Battery charger waveform analysis during full charge operation with oscilloscope O FF. Ground is used as reference except for (C) and
(F). Waveforms are indicative of fully charged batteries. Amplitudes change with battery charge rate and O N /O F F status of the oscilloscope.
3-16