a low cost micro controller based system high performance ac motor drives n.
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A LOW COST MICRO CONTROLLER BASED SYSTEM HIGH PERFORMANCE AC MOTOR DRIVES. SUBMITTED BY EDGEFX TEAM. ABSTRACT. principle of firing angle delay of thyristors using back to back SCR’s with control being fed from a microcontroller via opto isolators

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Presentation Transcript
abstract
ABSTRACT
  • principle of firing angle delay of thyristors using back to back SCR’s with control being fed from a microcontroller via optoisolators
  • The firing angle would be adjusted to maintain the load power by an up and down switch
hardware components
HARDWARE COMPONENTS
  • POWER SUPPLY BLOCK
  • MICROCONTROLLER (AT89S52 / AT89C51)
  • OPTO-ISOLATOR
  • OPAMP
  • THYRISTOR
  • LED
  • LOAD
  • RESISTORS & CAPACITORS
embedded systems
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.

micro controller
MICRO CONTROLLER

AT89S52

  • Compatible with MCS®-51 Products
  • 8K Bytes of In-System Programmable (ISP) Flash Memory
  • 4.0V to 5.5V Operating Range
  • Crystal Frequency 11.0592MHZ
  • 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
moc3021 opto coupler
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.
lm 358 opamp
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.
lm 358 pin diagram
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+
thyristor
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.

software requirements
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

bibilography
BIBILOGRAPHY
  • The 8051 Microcontroller and Embedded systems” by Muhammad Ali Mazidi and Janice Gillispie Mazidi , Pearson Education.
  • ATMEL 89S52 Data Sheets.
  • www.atmel.com
  • www.beyondlogic.org
  • www.wikipedia.org
  • www.howstuffworks.com
  • www.alldatasheets.com