The document describes a circuit for a battery charger to charge a 6V, 4AH battery. The circuit uses a step-down transformer, bridge rectifier, and zener diode to charge the battery safely. The aim is to understand switching circuits and identify components. Skills developed include problem solving, critical thinking, and identifying electronic components. The battery charger circuit can be used to charge batteries for devices like media players, power tools, and more.

1. NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)
GUIDED BY:- MR. BHANGE SIR
PRESENTED BY :
ASHISH SADAVARTI
MICROPROJECT SEMINAR ON
TITLE:-build a circuit for battery charger for charging a battery
of 6V, 4AH

2. AIM AND OBJECTIVE
INTRODUCTION
COURSE OUTCOME
PROGRAM OUTCOME (PO) ACHIEVED
DIAGRAM
WORKING / PROCEDURE
RESOURCES USED
APPLICATIONS
SKILL DEVELOPED
REFERENCES
CONTENTS
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

3. AIM AND OBJECTIVE
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)
Understand the actual working of diac & triac.
Develop basic technical knowledge different switching circuit.
Identify different component use in circuit with pin configuration.
We should be able to test the output for different input.
Correct the error as per defect.

4. INTRODUCTION
 Battery charger are used to maintain the electrical charger
on a secondary cell battery.
 As a battery discharge ,the electrolyte in the battery
combines crystal formation.
 Battery charger reverse the chemical reaction which
creates the crystal, thus rejuvenating the battery.
 For a battery charger to work properly the charge voltage
must be the same as the battery voltage .
 Applying too much voltage to a battery will cause the
electrolyte to overheat , and will damage the battery.
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

5. COURSE OUTCOME
 Identify electronic component in electronic circuit.
 Use battery in different application.
 Identify different components active and passive
 Understand the working of diode as a battery as a part of
application
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

6. PROGRAM OUTCOME (PO) ACHIEVED
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)
 Basic knowledge.
 Discipline knowledge.
 Experiments and practice.
 Engineering tools.
 Individual and team work .
 Communication.

7. DIAGRAM
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

8. WORKING / PROCEDURE
 Initially the input Ac (230V) supply is stepped down
to 15-0-15 V by step down transformer.
 The bridge wave rectifire (i.eD1-D4) gives the DC
supply .
 When cathode is held at discharge battery potentiai.
During each positive half cycle , potential ,so diode
D5 gets forward bias (ON) .
 Zener diode breakdown voltage shall be same rated
voltage. If zener diode , zener voltage is 12V then
battery charger upto 12V.
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

9. RESOURCES USED
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)
S.NO Name of resources Specification Quantity
1) Resistors 390ohm,680ohm,39
ohm/1w
3
2) Capacitors 0.01,0.01,4.7uf/25V 3
3) IC NE555 timer IC 1
4) Transformer SL100 1
5) Zener diode 65.6V 1
6) Battery 12V 1
7) Switch On/Off 1

10. APPLICATION
 Media players
 GPS
 Keyboards/Mice
 Bluetooth devices
 Power tools
 Wireless headsets
 Toothbrushes
 Shavers
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

11. SKILL DEVELOPED
 Complex problem-solving skills and a methodical mind.
 Critical thinking.
 Strong interest technology.
 Communication skills.
 Strong IT skills.
 Identify electronic components
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

12. REFERENCES
 www.en.wikibooks.org/wiki/Power Electronic.
 www.books.google.co.in./books/about/Power Electronic
 http://bitsavers. trailing - edge.com/
components/ge/1972_GE_SCR_Manual_5ed.pdf.
 A text- Lab Manual ,Zabar, Paul B. McGraw Hill
Publishing Co. Ltd, New Delhi , 1990,ISBN: 0070727937 ,
9780070727939.
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

13. Thank you
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)