Crown bca Manual Suplementario

] Balanced Current Amplifier

designs of power converters. OCA is the acronym for
Opposed Current Am-
plifier while OCIA is
shor t for Opposed
Cur rent Interleaved
Amplifier. The OCIA
designation is for de-
signs which achieve
additional interleaving
by using paralleled
and seriesed OCA
power stages.

Interleaved power
converters have the
highly desirable prop-
er ty that converter
speed is enhanced
with increased con-
verter size. As addi-
tional power stages
ar e paralleled, the
ripple frequencies are
increasing propor-
tional to the number of
switches. This r e-
duces the amount of
low-pass filtering re-

quired to eliminate the
switching signal from
the output. Since ripple
currents simultaneously
increase in frequency
while decreasing in am-
plitude, the filtering re-
quirements are multiply
relaxed.

Note that no matter how
many balanced current
power stages are inter-
leaved, total ripple re-
jection will always occur

at zero signal. Addi-
tional total nulls of the
output ripple will occur
at evenly spaced levels
inter mediate to full
scale. If N is the num-
ber of total switches in
the design, there will be
N+1 output levels which

 Positive-Programmed Output

 Negative-Programmed Output

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