Hi Everybody!
it seems that nobody is interested in this topic now.
I have found one interesting paper and hope everyone will have a look:

http://eprints.iisc.ernet.in/archive...ass_Of_PWM.pdf

In the 4th example circuit is what exactly I have been searching.
Also don't know where is D.K.nagare now. He said he has already made
prototypes and was doing field trials. Now he is vanished from Forum and
also from Yahoo.
Hope to hear from U soon.