1. SUBMITTED BY EDGEFX TEAM
A LOW COST MICRO CONTROLLER BASED SYSTEM HIGH PERFORMANCE AC MOTOR DRIVES
SUBMITTED BY
EDGEFX TEAM

2. ABSTRACT
principle of firing angle delay of thyristors using back to back SCR’s with control being fed from a microcontroller via opto isolators
The firing angle would be adjusted to maintain the load power by an up and down switch

3. BLOCK DIAGRAM

4. HARDWARE COMPONENTS POWER SUPPLY BLOCK
MICROCONTROLLER (AT89S52 / AT89C51)
OPTO-ISOLATOR
OPAMP
THYRISTOR
LED
LOAD
RESISTORS & CAPACITORS

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. 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.

11. LM 358 (OPAMP) 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.

12. 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+

13. THYRISTOR PIN 1 -- INPUT (ANODE) PIN 2– GATE PIN 3-- OUTPUT (KATHODE)
MODES OF OPERATION:
In the normal "off" state, the device restricts current to the leakage current
When the gate-to-cathode voltage exceeds a certain threshold the device turns "on" and conducts current.

14. LOAD

15. 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

16. KEIL COMPILER WINDOW

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

18. THANK ‘Q’