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This project goal is to achieve soft start control technique for a single-phase A.C. induction motor. It presents design of a low-cost; high-efficiency drive capable of supplying single-phase a.c. induction motor with PWM modulated sinusoidal voltage during start. Circuit operation is controlled by an 8051 family microcontroller.

The device is aimed at substituting conventional triac phase angle control drives. Circuit is capable of supplying single-phase a.c. induction motor (or general a.c. inductive/resistive load) with varying a.c. voltage at the start. Similar to triac control, voltage applied to load is varied from zero to maximum value in a small span of time during start. On the other hand, it uses a pulse width modulation technique (PWM), and when compared with phase angle control used for triacs, it produces much lower high order harmonics.

Thus, it suits EMC/EMI regulations much better. Because circuit is aimed at low-cost, low/medium-power applications, it does not use a conventional converter topology to produce the output voltage waveform. It directly modulates the mains a.c. voltage. Compared with costly converter, it requires a lower number of active and passive power components.

In summary, the device attempted here takes advantage of both the low price of the phase angle control and the low harmonic content and high efficiency that we can get with standard converter topology. The drive uses a PWM controlled MOSFET and the load in series with a bridge rectifier.

This drive based on this new control technique is targeted for use in consumer and industrial products: washing machine, dishwashers, ventilators, compressors, and wherever the system cost is a consideration.

Input terminals of rectifying bridge are connected in series to load. Output terminal (rectified side) has a power transistor (IGBT, MOSFET or bipolar) connected across them. When power transistor is off, current cannot flow through the rectifying bridge and load which is in series remains in an off-state. When power transistor is on, bridge output terminals are short-circuited, then current can flow through the rectifying bridge and thus through the load.

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

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.
Can be Customized for Arduino, Raspberry Pi, PIC
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
Software Requirements
  • 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.
Average Rating
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Showing 1 of 1 reviews
Ronak Kaushik Thaker, Gujarat on 29th April, 2016, 05:30 PM

I was searching for the final year projects in google. I got the edgefx link in the google and i got the the website details in that link.
I have no other option to do the project. That is why i have decided to buy the project from edgefx
the kit was delivered on time with right components.
the customer service has helped me in purchasing the project
Everything was good.
I would like to give reference to my friends.

Rating Breakdown (1 Reviews)

Edgefx Technologies Pvt. Ltd.,
Plot No. 105, 3rd Floor,
Liberty Plaza, Himayathnagar,
Hyderabad - 500029,
Telangana, India
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