Please help me with this question

Transients are at their worst when the SCR is switched on at

A) 30 °

B) 45°

C) 90

D) 180°

 

Hello,

Where is the voltage step the largest?
The transients are given in dV/dT.
A lot of information on thyristors and triacs can be found in the links of this page of the EDUCYPEDIA:
http://www.educypedia.be/electronics/composetriac.htm

Bertus

 

Hello,

Where is the voltage step the largest?

Translation for math impaired people: Where is the slope of the sine wave closest to being a vertical line?

 

Translation for math impaired people: Where is the slope of the sine wave closest to being a vertical line?

I think bertus meant where will the voltage step be the largest when the SCR is switched. That is the point that will cause the largest transient.

 

Hi

Thank you for your responses no additional information was given on this exam question

 

Hi

Thank you for your responses no additional information was given on this exam question

You have to make an assumption about your supply voltage waveform, e.g. that it is a sine wave with zero phase shift: V=0 at 0° angle. Having done that you can answer the question.