1. JAYAMUKHI INSTITUTE OF TECHNOLOGICAL SCIENCES
NARSAMPET, WARANGAL – 506 332
Department Of Electronics And Communication Engineering
PRESENTED BY:
M.ANUSHA(11C41A0415)
PREPAID ENERGY METER
Under the Guidance of :
S.Sandhya Rani
Assoc.Prof
2. ABSTRACT
In India, presently distribution companies are collecting revenues from their consumers by metering and
billing. The expenses for metering, billing, and collecting dues became complex as electricity is supplied to
large number of consumers located in far-flung areas, resulted in high cost per unit. To address these
problems, distribution companies can opt prepaid smart card energy meter, which overcomes the whole
problems associated with the present billing system and will make the consumer more conscious about
usage electricity.
This paper explores the design and assemble of smart card prepaid electricity meter system,
which enables the consumer to buy required amount of energy and also provides information about their
credit balance. A prototype of the system has been developed with the state-of-the-art digital and
information technology and proven to be stable, reliable, tamper resistant, low cost, and easy maintenance.
3. PRESENT POSTPAID ENERGY METER
• Electricity is a major source of energy in the world and used in every civilized country for domestic, commercial
and industrial purpose.
• The monthly power bill for consumers is calculated from post-paid meter reading based on the electricity
consumption.
• But the disadvantage of this system is that meter readers are needed to visit every door to door to read the meter
for billing purposes.
• This is a tiresome, lengthy and error prone process.
• Moreover, there is a chance for consumers as well as meter readers to do the corruption.
• In post-paid system , the monthly bill sent to the consumer by mail in the beginning of the month and all the
consumers often need to gather in a long queue to pay the bills.
• This procedure is tiresome and time consuming.
4. INTRODUCTION
In this paper, a prepaid metering (PPM) system has been proposed. Each
consumer has to install digitally designed prepaid electricity meter along with
smart card in their home, office or industry. Based on the electricity
utilization the credit will be deducted automatically from the smart card. The
consumer has to go to the vending station with the smart card and money to
buy electricity. Then the consumer will insert the smart card to the meter and
the meter will be recharged.
Fig: Architecture of the Prepaid Metering System
5. BLOCK DIAGRAM OF PREPAID ENERGY METER
MICROCONTROLLER
AT89C51
POWER SUPPLY
O
P
T
O
C
O
U
P
L
E
R
DIGITIAL ENERGY
METER
RELAY
LCD
MAX 232
DB9 CONNECTOR
SMART CARD
READER
LOAD
MAINS
SUPPLY
6. HARDWARE
• Power Supply
• AT89C51 Microcontroller
• Opto Coupler
• Digital Energy Meter
• Relay
• Load
• LCD
• Max 232
• Smart Card Reader
7. DESCRIPTION
AT89C51 MICROCONTROLLER
• The AT89C51 is a low-power, high-performance CMOS 8-bit microcomputer.
• The Atmel AT89C51 is a powerful microcomputer which provides a highly-flexible and
cost-effective solution to many embedded Control applications.
OPTO COUPLER
• It is an electronic device which is designed to transfer electrical signals by using light waves in order to provide
coupling with electrical isolation between its input and output.
8. DIGITAL ENERGY METER
• Electronic Energy Meter is based on Digital Micro Technology (DMT) and
• uses no moving parts. So the EEM is known as “Static Energy Meter” In
• EEM the accurate functioning is controlled by a specially designed IC called
• ASIC (Application Specified Integrated Circuit).
• Similar ASIC are now use in Washing Machines, Air Conditioners, Automobiles, Digital Camera etc.
RELAY
• A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but
other operating principles are also used, such as solid-state relays.
9. MAX 232
• Max-232 is an IC, which converts signals from an rs-232 serial port to signals
suitable for use in TTL.
• RTL logic 0 (+3v to +15v) is converted to 0v in TTL.
• RTL logic 1 (-3v to -15v) is converted to 5v in TTL.
LCD
• LCD displays are used in a wide range of applications, including palmtop
computers, word processors, photocopiers, point of sale terminals, medical
instruments, cellular phones, etc.
• The 16 x 2 intelligent alphanumeric dot matrix display is capable of displaying
224 different characters and symbols
10. SMART CARD
A smart card resembles a credit card in size and shape, but inside it is completely different. First of all, it has an
inside -- a normal credit card is a simple piece of plastic. The inside of a smart card usually contains an embedded
microprocessor. The microprocessor is under a gold contact pad on one side of the card.
Smarts cards may have up to 8 kilobytes of RAM, 346 kilobytes of ROM, 256 kilobytes of programmable ROM,
and a 16-bit microprocessor. The smart card uses a serial interface and receives its power from external sources like
a card reader.
12. Why Prepayment – From supplier point of view?
• Pay before use
• No bill production
• No bill distribution
• No need to chase payments
Why Prepayment – From Customer point of view?
• Reduce consumption when income is tight–make money last
• Reduce waste – conserve energy
• No billing errors
• Pay to suit your income status
15. CONCLUSION
This paper is intended to present an overview of prepaid energy meter, which can control the usage of electricity on
consumer side to avoid wastage of power. Prepaid energy meter is a concept to minimize the Electricity theft with a
cost efficient manner.
• The users are not bound to pay excesses amount of money, users have to pay according to their requirement.
• Prepaid energy meter is more reliable and user friendly.
From all these we can conclude that if we implement this prepaid energy meter then it can become more beneficial.
