PREPAID ENERGY METER

Topics: Energy conservation, Card reader, Smart card Pages: 5 (312 words) Published: June 25, 2015
PREPAID ENERGY
METER
USING SMART CARDS
By
S.Anjana
EEE-A,III-year
R.M.K ENGINEERING COLLEGE

INTRODUCTION

What is energy meter ?
What is prepaid energy meter ?
Why prepaid energy meter must be
used ?

NEED FOR PREPAID ENERGY METER
Induction type meters induce human errors
To know the amount of energy usage and prevent large
,unexpected bills
To avoid creeping in induction type meters
To save power

BLOCK DIAGRAM
Energy meter

Opto
coupler

Relay

Load

LCD
8051
microcontroller

MC

EEPROM

Power supply

Smart card
Reader/writer

HARDWARE COMPONENTS
Digital

energy meter (ADE7757)
SLE4442 smart card reader/writer,
MAX 232
EEPROM (SMART CARD)
Relay and Power supply
MCT2E Opto coupler
LCD display
8051 microcontroller

Digital energy meter

EEPROM (smart card)

• High accuracy ,portability,



A microchip embedded in a plastic card to
store information





EEPROM- Electrically Erasable
Programmable ROM



It is programmed to carry out specific
function



When inserted in card reader the contents
gets deleted automatically




durability and cheaper
Less error due to easy
calibration
Have inbuilt protection
circuits
Opto coupler is used for
calculation of pulses

8051 MICROCONTROLLER
• 8051 chips are used in a wide variety of control systems, •



telecom applications, robotics as well as in the automotive
industry
4 KB on chip program memory.
40-bit microcontroller with four 8-bit ports
1 Microsecond instruction cycle with 12 MHz Crystal.

PIN DIAGRAM

CIRCIUT DIAGRAM

WORKING

ADVANTAGES

• Energy conservation
• Load/demand under control
• Reliable to consumers
• Reduced financial risks
• Money and time based load
connection and
disconnection

DISADVANTAGES

• Above average costs for




your gas and electricity
Reconnecting by buying
electricity is difficult
Limited energy usage
Switching from induction
type to prepaid is difficult

CONCLUSION

• Looking at the benefits of this improved

technology and by overcoming its
disadvantages we can contribute something
as a part of energy and power conservation.
A simplified tariff structure will benefit the
utilities, the supplier and the customer.

THANK YOU

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