Power Supply Design Variable

Industrial Attachment Training-2017Rainbow Automation

Presented By:Engr. Shah Mim Obydulla

B.Sc in EEE (DUET)Director of

Rainbow Automation

Circuit Diagram

Pure dc

+

I/P220V AC

O/P

12V*2 , 3000mAPulse sating dc

ac + dc

+ V

0 V

D11N4007

IC

LLM 317

560R

3

1

2

Industrial Attachment Training-2017Rainbow Automation

Fig: Circuit Diagram Of Variable Power Supply

+1000uf50V

C 1 Output

0 V

_17 V V

D21N4007

Transformer

10k

V rms = V max * 0.7071=24 x 0.7071=17V

Pure dc

+1000uf50V

C 1

I/P220V AC

O/P

12V*2 , 3000mAPulse sating dc

ac + dc

Output_

17 V V

0 V

D11N4007

D21N4007

IC

Transformer

LLM 317

10k

560R

3

1

2

V rms = V max * 0.7071

Industrial Attachment Training-2017Rainbow Automation

Necessary Equipment

Transformer (12V x2 ,3000mA)------01pcs

Diode (IN4007)-------------------------02pcs

Capacitor (1000µF/50V)-------------01pcs

Regulator (IC LM317)------------------01pcs

Resistor (560 ohm)--------------------01pcs

V rms = V max * 0.7071=24 x 0.7071=17V

Variable Resistor (Pot 10K)------------01pcs

DC Load (Fan-12V)--------------------01pcs

Transformer

A.C Input 220V

A.C Input 220V

A.C O/P 12V

Industrial Attachment Training-2017Rainbow Automation

A.C Output

A.C Input 220V

A.C O/P 12V

0V

Fig: Transformer Fig: Transformer Symbol

Diode

Fig: Diode

Anode Cathode

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Fig: Diode Symbol

Capacitor

+ + -

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Fig: Capacitor Fig: Capacitor Symbol

+

-

-

LM317 IC Pin Configuration

Industrial Attachment Training-2017Rainbow Automation

Fig: LM317 IC

DC Load

Industrial Attachment Training-2017Rainbow Automation

Fig: Cooling Fan & Lamp e.t.c

Resistor

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Fig: Resistor Fig: Resistor Symbol

Variable Resistor

Industrial Attachment Training-2017Rainbow Automation

Fig: Variable Resistor Fig: Variable Resistor Symbol

Wiring Diagram

Input AC220 V

2 31

Industrial Attachment Training-2017Rainbow Automation

Fig: Wiring Diagram of Variable Power Supply

Industrial Attachment Training-2017Rainbow Automation