1. MICROCONTROLLER BASED LAMP LIFE EXTENDER BY ZVS USING THYRISTOR
SUBMITTED BY
EDGEFX TEAM

2. ABSTRACT
Incandescent lamps exhibit very low resistance in cold condition
Thus at the time of switching from cold state it draws very high current. Thus many lamps fail at the time of switch ON.
Engaging two SCR’s in anti parallel or a TRIAC the switching ON time can be precisely controlled by firing after detecting the zero cross point

3. BLOCK DIAGRAM

4. HARD WARE EQUIPMENTS POWER SUPPLY BLOCK
MICROCONTROLLER (AT89S52/AT89C51)
OPTO-ISOLATOR
ZVS
OPAMP LM358
TRIAC
LED
RESISTORS & CAPACITORS
1N4007, 1N4148
LOAD

6. EMBEDDED SYSTEMS Definition for :- EMBEDDED SYSTEMS
A combination of hardware and software which together
form a component of a larger machine.
An example of an embedded system is a microprocessor that
controls an automobile engine.
An embedded system is designed to run on its own without
human intervention, and may be required to respond to
events in real time.

7. EMBEDDED SYSTEMS

8. AT89S52 MICRO CONTROLLER Compatible with MCS®-51 Products
8K Bytes of In-System Programmable (ISP) Flash Memory
4.0V to 5.5V Operating Range
Crystal Frequency MHZ
Three-level Program Memory Lock
256 x 8-bit Internal RAM
32 Programmable I/O Lines
Three 16-bit Timer/Counters
Eight Interrupt Sources
Full Duplex UART Serial Channel
Watchdog Timer
AT89S52

9. PIN DIAGRAM OF AT89S52

10. TRIAC

11. MOC3021 ( OPTO COUPLER )
Opto-couplers are made up of a LED and a light sensitive device, all wrapped up in one package
no electrical connection between the two devices
The light sensitive device may be a photodiode, phototransistor, or more esoteric devices such as thyristors, triacs etc.

12. ZVS
Zero voltage cross detection means the supply voltage waveforms pass through zero for every 10msec. that means as we are using 50Hz ac signal the total cycle is 20ms.in that for every half cycle (i.e. 10ms) we will get zero signals
ZVS detection we are getting zero voltage pulses. We are applying these pulses to microcontroller
microcontroller gets these pulses then only the microcontroller is irrupted and it will perform the required/assigned operation.

13. ZVS WAVE FORM

14. LM 358 ( COMPARATOR ) Internally frequency compensated for unity gain.
Large dc voltage gain: 100 Db.
Wide bandwidth (unity gain): 1 MHz (temperature compensated)
Wide power supply range:
Single supply: 3V to 32V
or dual supplies: ±1.5V to ±16V
Very low supply current drain (500 µA)-essentially independent of supply voltage.
Low input offset voltage: 2 mV
Input common-mode voltage range includes ground.
Differential input voltage range equal to the power supply voltage.

15. LM 358 PIN DIAGRAM 1 - Output 1 2 - Inverting input
3 - Non-inverting input
4 – VCC-
5 - Non-inverting input 2
6 - Inverting input 2
7 - Output 2
8 – VCC+

16. LED LEDs are semiconductor devices are made out of silicon
When current passes through the LED, it emits photons as a byproduct. Normal light bulbs produce light by heating a metal filament until its white hot
LEDs present many advantages over traditional light sources including lower energy consumption, longer lifetime, improved robustness, smaller size and faster switching

17. SOFTWARE REQUIREMENTS
PROGRAMMING LANGUAGES Embedded C , ALP (Assembly Language) COMPILERS: Keil 2.0/3.0uv DUMPING SOFT WARE: Using Micro controller flash Software we are dumping our HEX Code into Micro Controller

18. KEIL COMPILER WINDOW

19. BIBILOGRAPHY
The Microcontroller and Embedded systems” by Muhammad Ali Mazidi and Janice Gillispie Mazidi , Pearson Education.
ATMEL 89S52 Data Sheets.

20. THANK ‘Q’