Sharp R-330N R Bedienungsanleitung PDF herunterladen (Seite 4)

3.

Power

supply

Block

DIAGRAM

3-1.

Block

diagram

1 :

sw

T1

, ,

i~

;:

1---1~------<:J

+12V supply

.~

o

>-+-+-----1

,z

f---i-t--:----'O

'i-5V

supply

T2

(Fig.

1)

3-2.

Shown

in Fig. 1

is

the

block diagram

of

the

power supply

circuit.

Souce

power

is

first eliminated

of

noise through

the

noise filter, rectified, and

it

then

charges

the

capacitor

of

the

filter. When this

DC

voltage

is

impressed

to

the

power switching circuit,

it

starts

to

oscillate

so

as'

to

convert

the

DC

voltage into a high frequency AC (20KHz

or

more) power, which

is

rectified

through

the

high

frequency

ferrite

transformer

(H)

to

produce

+5V and

+12V supplies. Both

outputs

are stabilized by means

of

the

controller. As each

of

outputs

is

supplied

to

the

controller,

control

signal

is

fed back

to

the

primairy side

by

the

means

of

the

saturable

reactor (T2). This control

signal changes

the

oscillation

fiequency

by controlling

the

switching

transistor

drive

current

so as

to

stabilize

outputs.

1 2 3 4 5 6 7 8 9 ... 15 16

SERVICE 1
Specification 2
'" 3
>-+-+-----1 4
1--35"S 5
',;'; 6
~" 7
I:" 8
========:::::J 9
I-'·W·· 10
!'i 11
' ' 12
='= 12
~iK~:~~; 13
" 14
Exteriors 15
Printed 16

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