Hitachi RAK-35NH5 - Page 240

         
12. DC Fan Motor Drive Circuit
 
      ! " #$ %! !& '!'(
 ) '!'( *! ('  #$ %! !& &+$ , #!% , " (**+ #!%  ( ! ( $
'!+  #$ %! * 
 -.  '  $ ## $''!    $+ $ #$ /0 (*( *  '!+  &+$ '
 % 12 ". .  !&  #$ %!
 ) (*( &+$  &  12 . .. $ . $  *(  &  &+$ (*( * 3  %'!
'%*(! '!+  #$ /0 (*(   (*( ,+$     *'# &$+( ) '**!
#!4('2 #  #$ /0 (*(  567
 ) #$ '(!! $1!%$+2 '! '  #$ %! '(!! (  $ ". !%
$ &!'(!! $ (*(   #$ '(!! $1!%$+2 * '  88 (! !%$+ *!$ $
88  &!'(!! ''!(
 9 (**+ , "   " #$ %!
:
;
;

:
"
;
;
:
.5
".
,
,
,
".
.
.:
.
.

,
"..
".
.;
".;
.5
.
.:
.
.
.
. ".
.
.
. ..
<.
.
-.
-.
.
"
,
.
"/
=)!%$+ 1$! ">
-.
,
,
,
.;


Microcomputer
FanPWM
output
Fanmotor
voltage
feedback
Fanmotor
current
abnormal
detection
)!%$+ 1$! 

?
@A
 ! "
#$ %!
,

1
3
2
- 270 -