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2. CIRCUIT DESCRIPTION
@ PWM
(Pulse Width Modulation) POWER SUPPLY
The
PWM
power
supply
is a circuit
that
maintains
stable
secondary
voltage
in a DC-DC
converter,
regardless
of the
voltage
fluctuation
and
load
fluctuation
of the
primary
voltage.
Former
PWM
power
supply
detected
and
controlled
only
positive
voltage
of DC-DC
con-
verter.
New
PWM
power
supply
increases
output
in the
lower
range
through
detecting
and
controlling
both
positive
and
negative
voltages
and
it creates
a higher
fidelity
sound.
Former
circuit
Frequency :20Hz
DC-DC
Converter
Contro]
Fig. 3
Tormer
circuit
did
not
detect
negative
voltage
and
it created
distortions
at
the
ower
part
as output
increases.
New
circuit
Frequency: 20Hz
pDC-DC
Control
Converter
Fig. 4
New
circuit
detects
both
positive
and
negative
voltage
and
it dose
not
create
any
distortions
at the
lower
part
even
when
output
increases.
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