Created December 6, 2018

Single phase VFD

Arduino based H bridge to change the speed of AC fan

Things used in this project

Hardware components

Infineon CoolMOS C7 Gold SJ MOSFET

Infineon ir2110

Arduino Nano R3

b1212

Story

Looking back at the evolution of AC fan starter , we use to have a Resister connected in series with the AC motor or fan. The smaller the resistance value the faster the fan use to rotate. The resister was just eating the power and creating the I2R losses. The heat sometime use to melt the Plastic enclosure. Whenever i use to go to someone house , i use to look at their switch board and big brick of fan regulator(starter). Is your brick also melting just like mine??

And after passage of time , the market started flooding with triac and capacitor based starter.

They were better then resistance based starter but use to create uneven waveform(harmonic) and shifting in Power factor.

NOTE: The resistance based starter does not create any Harmonic and can beat the Currently available VFD in terms of harmonics(THD) content .

In 2016 me and my friend started designing the H bridge for 3 phase BLDC motor.

At that time we came across the MOSFET. in diagram it looks easy but practically it was labor intensive to design(because of my lack of knowledge).

We blew lot of MOSFET , driver ic and controller.

International Rectifier irfz44n MOSFET was easily available for experiment , so we started it with that and did experiment withe the DFET .

After working with BLDC design i came to know that , we can run 3 phase AC motor with same controller too.

Many company makes and many industries uses 3 phase Vfd to control the motor speed.

But when it come to single phase VFD . Well no one is making or was interested.

NOTE: NOW THIS IS THE PART WHERE TECHNICAL SHIT WILL START TO HAPPEN (Above was all boringgggg stuff).

PART 1: IDIOT GUIDE ON HOW TO START WORKING ON VFD.

1) You need to make a sine wave.(but you cannot inject sine wave in gate of MOSFET)

Please look at the youtube link: https://www.youtube.com/watch?v=U3LJ_YtRb2I

a) The gate driver accept only digital i.e 1 and 0, high or low.

b) SPWM Sine Pulse width Modulation (its like a continuously varying duty cycle)

c) make an array in arduino to run wave.

NOTE: arduino nano can produce 8 bit value on its digital pin i.e 0 is minimum and 255 is max .

the system is not fuction because i blew up the driver ic.

The chinese b1212s are isolated dc dc convert are not reliable too.

Long story short.

Single phase VFD have many use in uses in domestic, industrial and instrument testing.

If Vfd would have function properly then i was planing to use it to test transformer parameter at different frequency orrr may be run the exhaust fan at different speed as desirable.

Code

H bridge code

  const int a=9;
  const int b=10;
  const int pot=A0;
  int v;
      int del()
                {
 
               
                }  
  
        byte arr[]={0,16 ,32, 48 ,63, 79,  94,  109, 123, 137, 150, 163, 175, 186, 196, 206, 215, 223, 231, 237, 243 ,247, 250, 253, 254, 255, 254, 253, 250 ,247 ,243, 237, 231, 223, 215, 206, 196, 186, 175, 163, 150, 137, 123 ,109, 94,  79,  63,  48,  32 , 16,  0 };

        byte arrayb[]={0 , 16 , 32,  48 , 63,  79,  94,  109, 123, 137, 150, 163, 175, 186, 196, 206, 215, 223, 231, 237, 243 ,247, 250, 253, 254, 255, 254, 253, 250 ,247 ,243, 237, 231, 223, 215, 206, 196, 186, 175, 163, 150, 137, 123 ,109, 94,  79,  63,  48,  32 , 16,0};
                       
            
    
   void setup() 
      {
                Serial.begin(9600);
                pinMode(a,OUTPUT);
                pinMode(b,OUTPUT);
   
      }

void loop()
     {
       v=10*analogRead(pot);
       Serial.println(v);
       
               for(byte i=0;i<50;i++)
               {
                analogWrite(a,arr[i]);
                delayMicroseconds(v);
               }
  
               for(byte p=0;p<50;p++)
   
              {
                analogWrite(b,arrayb[p]);
                delayMicroseconds(v);
              }
   
   
        }

Credits

Tejeshw Vardhan

2 projects • 1 follower

Single phase VFD

Things used in this project

Hardware components

Story

Schematics

single Phase VFD

Code

H bridge code

Credits

Tejeshw Vardhan

Comments

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Single phase VFD

Single phase VFD

Things used in this project

Hardware components

Story

Schematics

single Phase VFD

Code

H bridge code

Credits

Tejeshw Vardhan

Comments