firing circuit

[hasan081043]

i want to work with thyristor .please suggest some firing circuit for thyristor.

 

[hasan081043]

hlw everyone

 

[jpanhalt]

All of the manufacturers have application notes on firing circuits and factors that need need to be considered in their design.

Google gives a lotof examples, if that is what you want: https://www.google.com/search?q=scr...Esq8yAHY7oGYDQ&ved=0CCkQsAQ&biw=1600&bih=1086


If you will describe what you are using the SCR for, we can probably give a more limited response with examples.

John.

 

[duke37]

Different thyristors will need different drive levels There are thyristors with sensitive gates such as the C106 and others which need more drive.

For electric fencers needing one pulse per second, I have used :-
1. Neon indicator bulb.
2. Diac
3. CMOS gate

For phase angle control you will need a more complcated circuit.

 

[hasan081043]

SCR firing circuit

Actually i want to design a half wave controlled rectifier with thyristor.thyristor model-TYN612
.Ac supply 220v ac 50Hz frequency

 

[jpanhalt]

If you search on thyristor half-wave rectifier you will find many examples. Here are some examples:

http://services.eng.uts.edu.au/~venkat/pe_html/pe04_nc6.htm

http://www.brighthubengineering.com...4-simple-thyristor-circuits-explained/#imgn_3 (scroll to AC lamp flasher)

http://www.electronicshub.org/battery-charger-circuit-using-scr/ (battery charger)

John

 

[duke37]

TYN612 600V 12A gate 30mA 1.3V

 

[hasan081043]

thanks jpanhalt and duke37
But in those circuit firing circuit is not good .please prefar me some other circuit

 

[hasan081043]

SCR firing circuit

thanks jpanhalt and duke37
But in those circuit firing circuit is not good .please prefar me some other circuit

 

[jpanhalt]

@hasan
I feel like we are blindfolded and trying to hit a moving target.
1) What are your design specifications for the firing circuit?
2) What specifically was "not good" with the suggested circuits already provided?

You may find this excellent reference helpful: http://www.onsemi.com/pub_link/Collateral/HBD855-D.PDF

John

 

[hasan081043]

SCR firing circuit

The supply is 220v 50Hz ac.I need 60V DC output voltage .For this i need to fire the thyristor at 80

degree.The main problem is to fire the thyristor at 80 degree .please sugest me the firing circuit.
for half wave controlled rectifier
Vdc=Vm(1+cost)/2*pi
here t=firing angle
Vm=maximum ac voltage
Vdc=output DC voltage

So for Vdc=60V ,Vm=1.414*220=311
t=?
the required firing angle would be 80 degree.
so please help me how i can fire the scr at an angle 80 degree.

 

[Harald Kapp]

Use an RC combination to generate the required phase shift. Use a diac to create a defined trigger point. Read here for more.