There is a mechanism in the forward converter to empty the transformer core during each switching cycle, known as the "magnetic pass" phenomenon, which saturates the transformer and introduces a catastrophic failure. In high power applications, switching power supplies require transformer reset windings, resulting in large and large transformers. Another approach is to use a double - switch approach to compound - position winding. The flyback also requires an RCD clamp to release the leakage energy, which causes the high voltage on the MOSFET to be switched on and off. However, it is also good to have a discharge path ahead. This is a conventional transformer that transmits primary to secondary energy in real time, as opposed to a flyback that stores energy before it is transmitted to the secondary. If the reset winding is used as the discharge mechanism, the forward converter transformer can be bulky (but compared to the 50/60 Hz transformer in a linear supply because of the high switching frequency). Forward converters are also available for high input voltages, such as flyback, because the available controllers are rated for high voltages. Forward converters are more efficient than flyback converters because their transformers do not store energy as intentionally as flyback converters. For power over 150W, flyback is the topology. It can still be used for power below 150W, but the flyback is still below this power level and the flyback is simple and cheap, so for me personally, I will look for flyback power to wait up to 150W and over this power. A forward converter is also provided between the input (AC side) and the output.
