Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

thyristor firing timing

Status
Not open for further replies.

xjackal

Full Member level 3
Full Member level 3
Joined
Jan 21, 2004
Messages
163
Helped
20
Reputation
40
Reaction score
8
Trophy points
1,298
Activity points
1,303
thyristor firing circuit

hi friends.i have a simple design problem.i want to trigger thyristor while the circuit produces full wave.so u know that circuit and the timing should be the same with them.help please
 


    xjackal

    Points: 2
    Helpful Answer Positive Rating
firing circuit of thyristor

thank u for the reply.but my circuit should be like this.i know i can do it with resistors and cap but how and how can i fire up the thyrstor at their right time for their turn?
 
thyristor firing circuits

The easiest way of synchronized firing of both thyristors is through pulse transformer(s) ..
Have a look at Fig.B or Fig.E .. see picture below .. configuration --> CT (centre tap) ..

Regards,
IanP
 
firing circuit of thyristor,pdf

so i should use pulse transformer instead of the transformer.and how to trigger them.can u post a clear image IanP.and i should have 220v,i mean 110v for one part,110 for the other.
how can i provide it.
or is it the scheme that u send before taking ac from primer and rectifying it with bridge and pulsing it to thyrstors?
but what should be the voltage of the pulse transformators this way?
thnx for the help
 

thyristors pdf

You can leave the concept with a transformer in CT configuration and two SCR used as controlled rectifiers .. I don't know your application in details, but having an isolation from the mains is always a good idea ..

Take a look at the circuit below ..
It shows an example on how to controll SCRs with a pulse transformer ..
To start with, you will need a reference pulse at "zero-crossing" - 2-transistor circuit fed directly from 100Hz signal from the r-bridge ..
If you don't want to use firing angle control you can remove both 555 timers from the circuit and directly connect collector of the zero-crossing detector with the gate of the MOSFET on the primary winding of the pulse transformer ..

More details on this circuit can be found at:
http://www.scopeboy.com/tesla/ol2psu.html

Regards,
IanP
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top