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PROJECT DESCRIPTION

This project is designed to provide  protection to the induction motor by soft start control technique using IGBT with PWM control, instead of firing-angle control that generates high THD. Thus this process is the best  for protecting the induction motor.

This proposed system built with a microcontroller and an IGBT switch is duly interfaced to the microcontroller to control the load by applying respective PWM pulses from the microcontroller based on zero crossing detector.

Unidirectional current can flow through the IGBT using the bridge rectifier and then to the load. The duty cycles (PWM) are varied using a push-button switch, and thus turn the load. Thus, by changing the duty cycle of the PWM pulses, the power to the load is controlled.  

The input terminals of the bridge rectifier are connected in series to the load. The output terminal of the bridge rectifier is connected to the power transistor (IGBT, MOSFET ). When the power transistor is off, the current cannot flow through rectifying bridge, and the load which is in series remains in off-state.

When the power transistor is on, the bridge output terminals are short-circuited through the IGBT, and then, the current can flow through the rectifying bridge and thus, through load.

Thus, by changing the duty cycle of the PWM pulses to the power switch, the power to load is controlled. Special care is taken in circuit such that PWM pulses are synchronized with supply phase by zero voltage sensing points.

 

 

×

This project is designed to provide  protection to the induction motor by soft start control technique using IGBT with PWM control, instead of firing-angle control that generates high THD. Thus this process is the best  for protecting the induction motor.

This proposed system built with a microcontroller and an IGBT switch is duly interfaced to the microcontroller to control the load by applying respective PWM pulses from the microcontroller based on zero crossing detector.

Unidirectional current can flow through the IGBT using the bridge rectifier and then to the load. The duty cycles (PWM) are varied using a push-button switch, and thus turn the load. Thus, by changing the duty cycle of the PWM pulses, the power to the load is controlled.  

The input terminals of the bridge rectifier are connected in series to the load. The output terminal of the bridge rectifier is connected to the power transistor (IGBT, MOSFET ). When the power transistor is off, the current cannot flow through rectifying bridge, and the load which is in series remains in off-state.

When the power transistor is on, the bridge output terminals are short-circuited through the IGBT, and then, the current can flow through the rectifying bridge and thus, through load.

Thus, by changing the duty cycle of the PWM pulses to the power switch, the power to load is controlled. Special care is taken in circuit such that PWM pulses are synchronized with supply phase by zero voltage sensing points.

 

 

PROJECT HIGHLIGHTS
Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Branding-free material.
Pre-programmed Microcontroller.
Call/mail for Tech Support from 10 am - 7 pm IST.
×
Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Branding-free material.
Pre-programmed Microcontroller.
Call/mail for Tech Support from 10 am - 7 pm IST.
BLOCK DIAGRAM
IGBT based Soft Start for Induction Motor
Hardware Requirements
  • 8051 series Microcontroller, LM358, Opto- isolators, IGBT, Push Button, Transformer, Diodes, Voltage Regulator, Resistors, Capacitors, Zener, Crystal, Lamp,
×
  • 8051 series Microcontroller, LM358, Opto- isolators, IGBT, Push Button, Transformer, Diodes, Voltage Regulator, Resistors, Capacitors, Zener, Crystal, Lamp,
Software Requirements
  • Keil compiler
    Languages: Embedded C or Assembly
×
  • Keil compiler
    Languages: Embedded C or Assembly
Q & A
Q:  What is the formula for calculating smoothing capacitor value?
A:  There is some approximated formula .Peak to peak ripple voltage = Load current in amps / (2*line frequency in hertz *capacitance in farads). But as rule of thumb for 1 A current 1000uF is best. Thus it is load dependent.
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