I
I .
I
i
CFR-102
NOISE
FILTER
'11
f=1:t
CBB-13
CBG-68
I
FL
1
I
I
n
MAIN
PS
vo"u!
e~-.a6",v•
•C~~Q3
1 .
-l.c
PO'·'ER
35ov[o-;---;-<> [
••'"'"'
_
O•
2
. · _
'"""'
FACT
0 R
g~,
,
~
I j
CDRRECOOR
o-;---=------_J
oc
• 3 ]
FL2
OUTPUT
30A
.....
L__
____
--------
-------
--~-
-----~
Fig.3 Block Diagram of NBL-169 Power Supply Unit
2.3.1 CSA-222 Relay Circuit
The CSA-222 relay circuit consists of a relay which turns on/off the AC power supply
and a noise filter circuit.
The
AC
inputvaltage
is
applied to the terminal boards
TBi
and TB2
and
sent to the
NBL:.i69 power supply unit via
Ki-i
and
Ki-2
relays. ·
As
the relay
K2
is
activated by the
DC
i
3.8
V provided from the exciter, the JRL-
2000F
can
be turned on/off by the exciter main switch.
2.3.2 CBB-13 Power Factor Corrector
The CBB-13 power factor corrector converts
AC1
00
to 240V to
DC
350 V by a DC-DC
converter inserted
in
the smothing circuit.
ln this DC-DC converter, a PFC exclusive control
IC
of
IC1
corrects the line current
waveform to a sine-curved waveform.
Resistor
Ri
absorbs the rash current generated at the re!ay
Ki
when the
AC
power is
turned
on.
The MOSFETs
TR1
to TR3 controlled by
ICi,
switch the current which flows through
. choke coils L 1 and
L2
with a frequency of about
90
kHz.
The switched MOSFET drain valtage charges the capacitors
Ci
to C3 via diode CD2.
As
a result ,a DC350 V valtage develops at the output terminal of TE3.
The current transformer
T1
measures the MOSFET switching current value and de-
tects the excessive current by the feedback of the value to IC1.
The circuit composed of
R11
to R13 detects an AC valtage waveform and sends it to
JCi. The
IC1
controls the current waveform based on this waveform.
Resistars R25 to R27 feed back the outputvaltage to
ICi.
iO
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