This document discusses prepaid energy meters. It begins by defining an energy meter and a prepaid energy meter. It then explains the components of a prepaid energy meter, including an EEPROM IC, AT89S52 microcontroller, LCD display, ULN2003 driver, and AT2402 chip. The document outlines how these components work together to allow customers to pay for electricity upfront via a prepaid card system, monitor their usage, receive low balance alerts, and have their power automatically disconnected if credit runs out. Prepaid energy meters provide benefits to both utilities and consumers like budgeting, reduced overhead and billing hassles, and load control.

1. Seminar on
Prepaid Energy
meter
By
Kamal Lochan Samal
0901106195

2. Introduction
 What is an energy meter ?
 What is a prepaid energy meter ?
 Why prepaid energy meter must be used ?

3. Working of house hold energy meter
 Driving system.
 Moving system.
 Breaking system.
 Registering system.

5. Internal view of Induction type energy meter

6. DISADVANTAGES OF INDUTION TYPE ENERGY
METER
 Induce human error while noting down the
reading
 Amount of electricity consume in rupees is not
displayed
 Creeping can cause significant error

7. Block diagram of Prepaid energy meter

8. Overall charcteristics of prepaid energy meter
 Methodology.
 Collection of revenues.
 Loading the credit revenue into the meter.
 Decrementing the revenue.
 Providing the alarm.
 Disconnection.
 Security of transactions.
 Unloading the revenue.

9. Components of prepaid energy meter
 EEPROM IC (Smart card)
 AT89S52
 16*2 LCD
 ULN2003
 AT2402
 Digital energy meter

10. EEPROM IC
 It is called as smart card.
 It is a electrical erasable read only memory.
 It is to upload the amount recharge in form of
electrical energy.
 The contents are automatically deleted once it is
inserted inside the card reader.

11. AT89S52
 It belongs to family of microcontrollers.
 It has total 40 pins.
 32 I/O lines.
 8K flash memory ROM and 256K RAM.
 It operates at 33KHz frequency.
 Addressing similar to 8051 microcontroller.
 Only pin nos 12,31,40,34-39,22,21,25,28 are used for
our purpose.

12. Pin diagram of AT89S52

13. ULN2003
 It consists of seven independent darlington
connection.
 It acts as a current amplifier circuit.
 It is used to run a high voltage/current peripheral
circuits.
 When input terminal is high it offers low
impedance path other wise it offers a high
impedance.
 Any two input and output are used for our
purpose.

14. Internal view of ULN2003

15. Working of ULN2003

16. AT2402 and 16*2 LCD display
 Chip is used to read data from eeprom through
card reader.
 All the data are transmitted serially in 8 bit words.
 It also verifies the code prior to read
operation(PSC).
 16*2 LCD display has two row screen and each
row displays 16 digit at a time.
 It also acts as a tariff indicator, indicates amount
of electricity consume and remaining.

17. Pin diagram of 24C02

18. Digital energy meter
 ADE7757.
 7805(voltage regulator).
 MCT2E(opto coupler).

19. Energy meter chip

20. Working principle of digital energy meter
 Output in form of frequency.
 Energy consume proportional to output
frequency.
 Relatively cheaper meter.
 Human error are reduced while calculating.
 Opto coupler is used for calculation of pulses.
 Output frequency can be selected for other
purpose also , such as running a stepper motor an
electromagnetic register.

21. INPUT AND OUTPUT OF 7757

22. INPUT AND OUT WAVE FOFM

23. RELATING FORMULA

24. Energy meter chip

25. Circuit diagram of prepaid energy meter

26. Benefits to consumers
 Pay as you go.
 No need to stand in queue.
 No surprising bills.
 No bill disputes.
 Allow customer to budget expenses.
 Help customer contribute towards energy
conservation.

27. Benefits to utilities
 Up front payment for electricity.
 Lower overheads.
 No billing hassles.
 No disconnection/reconnection.
 Tamper and fraud detection.
 Money and time based load connection and
disconnection.
 Load/demand control.

28. THANK YOU