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MICROCONTROLLER BASED VARIABLE FREQUENCY POWER INVERTER

Platform : EMBEDDED

IEEE Projects Years : 2012-13

MICROCONTROLLER BASED VARIABLE FREQUENCY POWER INVERTER


 

AIM:

  The main aim of this project is to implement a Microcontroller Based Variable Frequency Power Inverter. It can be used to generate the variable frequency AC voltage to control the speed of the induction motor.

 

PURPOSE:

    The variable frequency inverters are used in wide applications especially three phase induction motor drive traction and it is popular in many high power industrial applications, such as speed and torque control. Single phase induction motor (SPIM), which has a common using in residential applications, domestic such as dishwashers, cloths dryers, fans, pumps, etc.

 

 

METHODOLOGY:

BLOCK DIAGRAM

 

 

 

 

 

Power Supply:

 

 

 
   

 

 

 

 

 

 


DESCRIPTION:

       The microcontroller provides the variable frequency pulse width modulation (PWM) signal that controls the applied voltage on the gate drive, which provides the required PWM frequency with fewer harmonic at the output of the power inverter.

      Single phase variable frequency inverter consists of full bridge diode rectifier is fed from 230Vac power supply; the rectifier bridge is used to convert the AC supply voltage to a DC voltage. The output voltage of the rectifier bridge is smoothed using a capacitor which helps to remove its ripples. Then the fixed DC voltage is fed to the single bridge IGBT inverter, which receives the DC voltage and converts it to AC voltage with variable frequency to feed the motor under control.

     The microcontroller has been programmed to vary the frequency of the PWM signal that controls the frequency of the voltage applied at the gate drives, and as a result of this we can control the frequency of the inverter.

 

SOFTWARE USED:

  1. Embedded C
  2. Keil IDE
  3. Uc-Flash

 

 

HARDWARE USED:

1.Micro controller

2.power supply

3.Keypad

4.LCD Display

5.Embedded controller

6.IGBT Driver circuit

7.IGBT

8.Motor

 

APPLICATIONS:

  1. Motor speed regulation
  2. In manufacturing industries
  3. Speed control of DC motor

 

ADVANTAGES:

  1. Reliable operations at large currents
  2. Controls the process
  3. Ease of operation

 

RESULT:

     A stable variable frequency inverter over wide range has been obtained and a good agreement has been found.


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