IV. CONCLUSION
The paper contains the detailed design process for flyback
converter. Despite the most of guidelines for flyback the
calculations are reversed in respect to the input. Some of the
formulae have been changed, because the efficiency has
more significant role than the voltage drop of output
rectifier in this case. The efficiency of the conventional
flyback converter is above 90% as shows the experimental
test. For this reason it is desired to apply improvements to
the circuit. Adding the active clamp have decreased the
efficiency of converter. Minor changes in the circuit and
elimination of air gap in transformer core were done to
implement the forward converter with active clamp.
According to test the most efficient topology is forward
converter with active clamp, less efficient is common flyback
converter. Adding the active clamp to the flyback
according to several literature sources and this research
results has no sense due to complicated control system
design and low efficiency.
The design of transformer for active clamp forward
converter is tradeoff between the main switch switching
voltage reduction and power flow. As the leakage inductance
dependent on the transformer design is affecting both
of these parameters significantly.