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firing circuit

hasan081043

Nov 26, 2013
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Nov 26, 2013
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i want to work with thyristor .please suggest some firing circuit for thyristor.
 

duke37

Jan 9, 2011
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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

Nov 26, 2013
6
Joined
Nov 26, 2013
Messages
6
SCR firing circuit

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

hasan081043

Nov 26, 2013
6
Joined
Nov 26, 2013
Messages
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thanks jpanhalt and duke37
But in those circuit firing circuit is not good .please prefar me some other circuit
 

hasan081043

Nov 26, 2013
6
Joined
Nov 26, 2013
Messages
6
SCR firing circuit

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

hasan081043

Nov 26, 2013
6
Joined
Nov 26, 2013
Messages
6
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.
 

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Harald Kapp

Moderator
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Nov 17, 2011
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Use an RC combination to generate the required phase shift. Use a diac to create a defined trigger point. Read here for more.
 
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