I want to know what is the maximum value of the pulse width that can be set.

And regarding the phase sequence detection in AC circuits(electricity meter) please send me the required circuitry.

 

The maximum value of the pulse width is 100%.

For your circuit, check European patent number EP0661789, which includes a "conventional phase sequence detection arrangement."

 

Your in luck, less than 1000 hits on your request "And regarding the phase sequence detection in AC circuits(electricity meter) please send me the required circuitry."

http://www.google.com/search?hl=en&q=+"phase+sequence+detection+"

 

The maximum value of the pulse width is 100%.

I'll have to respectfully disagree with your assertion, based on the fact that no PRT was specified, and without that the PRT could be as long as an infinite number of years.

As Murphy's Law figures in heavily with MTBF rates, I'll suggest that the maximum pulse width with an infinite PRT is 99.999....%. You might approach 100% - but it's impossible to actually get 100%.

Besides, were the duty cycle 100%, it would no longer be a pulse; it would be a DC level.

 

Mea Culpa. I concur with the Wook. (Dang, but I hate it when a jar-head catches me with my brain off-line.)