Hi all members:

Michael I am registered user one year ago.
I could send a scheme in ORCAD but I do not find the way even.
Jez and Andy Nel are correct I want to produce a variable AC output
to be able to use a drill BOSCH of 200vdc and 300hertz
the main power in my country is 220vac and 60 hertz.

Rob: My intention is not to ask of the Stage of Power. I am modifying an equipment that works with logic TTL and provided that with the use of a microcontroller 8051 it can give more advantages i will try to change the stage of control.
But when I translated the BOOLEAN logic booleana from the previous control I obtained a sequence that I believe myself some doubts and for this reason I resort to the Forum before burn the equipment.

Oleg Sergeev is correct too. When I translated the logic of the previous circuit I find that in the sequence the gates A and B activates at the same time what generates a short circuit.
Please Members Not to focus the topic in the Stage of power I am not a student.
I have developed a 8051PLC based thanks to 8052.com.

If you want to help me I can send the complete Scheme of the Equipment in TTL.

Thanks to All.