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PREPAID ENERGY METER

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PREPAID ENERGY METER
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
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