The use of an active clamp circuit over the famous RCD clamp is due to its superiority for its better efficiency, more duty cycle, lower current stress and no energy dissipation as the magnetising current is recycled and used again. The use of the transformer instead of the normal buck converter is because by using a transformer the voltage can be stepped down to quite a low value, i.e. more than 2 times less of the input voltage which was not possible in the buck converter. The use of synchronous rectification is to increase the efficiency of the system, as the body diode conduction losses are quite low for a Mosfet and thus less heat produced in using that. The circuit for a forward converter with an active clamp and transformer reset is made with the synchronous rectification
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