sabu31
Advanced Member level 1
Dear All,
I am testing a Flyback converter with input 230V ac and output of 12 V at 3.4A.
When I am calculating efficiency from RMS values the efficiency is coming around 40%. I am attaching the waveforms of the same. The switching frequency is 100kHz.
I am noticing that there is excessive heating of output diode. I am assuming this is due to the smaller heat sink (13degree/W coefficient) and heat sink temperature is going upto 90 degree after running for 5minutes after which I switched off the system. Input side I am not observing any heating of Mosfet, snubber etc.
What could be the issue with the design for causing lower efficiency.
I am testing a Flyback converter with input 230V ac and output of 12 V at 3.4A.
When I am calculating efficiency from RMS values the efficiency is coming around 40%. I am attaching the waveforms of the same. The switching frequency is 100kHz.
I am noticing that there is excessive heating of output diode. I am assuming this is due to the smaller heat sink (13degree/W coefficient) and heat sink temperature is going upto 90 degree after running for 5minutes after which I switched off the system. Input side I am not observing any heating of Mosfet, snubber etc.
What could be the issue with the design for causing lower efficiency.