The above waveform attached shows input sinewave which is stepped down using transformer and I am using voltage based zero cross detection for firing Triac. Above waveform shows TRIAC is fired at almost 10% of Positive and Negative Half cycle. I want to remove that extra energy which getting generated because of Inductive load.I have tried changing resistor and capacitor for my snubber circuit but that didn't help.The main issue is as I try to conduct more part of sine wave like 50% of positive and negative Half the more is the inductive energy.

In above waveform I am firing Triac at 50% of both half cycles but the other half is energy coming from Inductive load. At 50% itself the voltage across inductive load is showing around 220 volts because of this extra energy.If I go even more like more than 50% the waveform gets distorted.In my case this inductive load is a Electromagentic Feeder Coil it's used for Vibratory Feeder Controller.

 

Unfortunately, you will have to change the triac for some other device. The triac does not switch off until the current through it reaches zero, and that will happen some time after zero-crossing for an inductive load.
If you do wish to switch off at voltage zero-crossing, you will have to decide what to do with the energy that is stored in the inductor.

 

Unfortunately, you will have to change the triac for some other device. The triac does not switch off until the current through it reaches zero, and that will happen some time after zero-crossing for an inductive load.
If you do wish to switch off at voltage zero-crossing, you will have to decide what to do with the energy that is stored in the inductor.

Thank you for replying,I understand what you saying but because of some reasons I won't be able to change Triac.I am more interested in different methods to remove this energy in such conditions.

 

Good luck. You'll need it to persuade a triac to switch off when it doesn't want to.

Your only hope is to neutralise the inductance by connecting an RC network across it where R is equivalent to the series resistance of the inductor, and C=L/R^2.
It will dissipate a lot of power.

 

RE:""It will dissipate a lot of power.""
I would use instead of resistor just the appropriate "heat bomb" as nowadays is polit-correct to label the Edisson incandescent lamps.

 

RE:""It will dissipate a lot of power.""
I would use instead of resistor just the appropriate "heat bomb" as nowadays is polit-correct to label the Edisson incandescent lamps.

I have one more observation which I like to share the above waveform came when an Incandescent lamp came in parallel with an inductive load.Both were working fine as I was able to fire Triac at any angle and the waveform was not distorting but this can't be my solution.It would be funny giving an lamp to the end customer.I want to know what exactly happend here?Is there any circuit or electronic component that could discharge such huge energy?

 

It will work if you swamp the inductive load with a resistive load, because it takes the power factor closer to unity. Does your circuit fail if the lamp fails? Are filament lamps still readily available where you are?

 

It will work if you swamp the inductive load with a resistive load, because it takes the power factor closer to unity. Does your circuit fail if the lamp fails? Are filament lamps still readily available where you are?

No circuit is not failing when an purely resistive load and inductive load together coming,also I tested only with resistive load also the circuit works properly.I would like to give another input that above waveforms are across load not across Triac.

 

Idea only.
See how you can to form good shaped pulse of inductance current :

 

Idea only.
See how you can to form good shaped pulse of inductance current :
View attachment 301635

?
Above circuit will only work for half wave right?I need full 230v so I need my triac to control whole sine wave.

 

I need my triac to control whole sine wave

AN308 Application note
TRIAC analog control circuits for inductive loads
Introduction
The TRIACs of today are well suited to the requirements of switching inductive loads.
TRIAC control circuits must be particularly well tuned to be both economical and applicable to inductive loads.
The purpose of this document is to present different methods of TRIAC control with their applications
and to analyze their relative advantages and disadvantages.
A simple circuit offering all the guarantees of reliability is proposed for inductive loads.

 

You can do what you like to make the voltage waveform look tidy, but the unavoidable truth is that there will be current flowing in your inductor at the point the mains voltage crosses zero. The only way to remove this current is to put a negative voltage across the inductor until the current reaches zero. That’s exactly what the triac does.