Clear Filters
Clear Filters

my firing angle on this triac does not work correctly ?

9 views (last 30 days)
Hi everyone, I have implemented a triac circuit with a resistive load, when I run the simulation I have 3 curve (figure 2), the problem is that the curves are wrong compared to the theory (figure 3), so surely my firing angle alpha = 36 ( figure 4) has a problem under the mask.
Guys if one of you knows how to implement a correct firing angle , explain to me plz. thanks
figure 1
figure 2
figure 3
figure 4

Answers (3)

Dr Narayanaswamy P R Iyer
For switching thyristors, you may refer to the following text book:
NARAYANASWAMY P R IYER: "Power Electronic Converters Interactive Modelling Using Simulink", CRC Press / Taylor and Francis, 2018, Chapter 2.

Thyristor 1 is 36 degree , then thyristor 2 is 180+36 degree with phase delay of 0.01sec.

Joel Van Sickel
Joel Van Sickel on 11 Jan 2022
My first guess would be that you need to double the rate of your firing. It looks like you are triggering the first thyristor correctly for the positive portion of the sine wave, but need to trigger the other thyristor for the negative side. This is what R Sriranjani Ramakrishnan is suggesting. You can either have double the rate, or add a second pule generator running at 36+180.


More Answers in the  Power Electronics Control


Find more on Electrical Block Libraries in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!