A plain reading of basics of talak would reveal that:
There are two kinds of talaq recognised by Hanafi sect of Muslims, they are:
1. Talaq-us-Sunnat (approved form) and
2. Talaq-ul-bida (not approved form)
Talaq-us-Sunnat is the divorce which is effected in accordance with the rules laid down in the Quran.
The Talaq-us-Sunnat is either Ahsan or Hasan;
Talaq-e-Hasan is the approved form of talaq whereas the Talaq-e-Ahsan is the cost approved form of talaq.
The talaq e ahsan consists of one single pronouncement of divorce in a period ot Tuhur (a period during which time a woman is free her menstrual period). The talaq given during the period of Tuhuris followed by abstaining from sexual intercourse during the period of iddat, which is three months, or if the woman is pregnant until delivery. Within three months the husband can revoke or cancel the divorce.
The second mode of talaq i.e., talaq e hasan is less approved than talaq e ahsan because in order to ill-treat wife the husband used to divorce his wife and revoke it several times. The Prophet of Islam by rule of irrevocability after third pronouncement indicated clearly that such a practice could not be continued indefinitely.
In any case talaq given in the fit of anger is corrected after the anger has died down in three months.
Technically the power of the husband to give talaq is absolute. When a man says to his wife "I have divorced thee", either in her presence or in her absence it means that he has divorced her.
Iddat - Divorced women shall wait concerning themselves for three monthly periods. And their husbands have the better rights to take them back in that period, if they wish for reconciliation.
Hope the above clarifies your doubts.