DCM operating mode | What are the Pros and Cons ?

Discontinuous Conduction Mode (DCM) is widely used in flyback inverter. The advantages and disadvantages of using DCM are given below.

Advantages

1. Fast dynamic response with stable operation.
2. There is no issue of reverse recovery, therefore no noise or EMI problems.
3. Zero turn on losses
4. Transformer size is small.
5. Its an open loop control that makes it an easier bit to eat. The open loop control is enough to synthesize the sinusoidal current with low THD.

Disadvantages

1. Current waveform has higher form factor,
2. Therefore more power losses. Therefore it is necessary to use devices with very low turn on resistance.
3. Current pulses with high peaks and high amount of discontinuity happens therefore device paralleling is often required.

Reference:

Tamyurek, B.; Kirimer, B., "An Interleaved High-Power Flyback Inverter for Photovoltaic Applications," Power Electronics, IEEE Transactions on , vol.PP, no.99, pp.1,1
doi: 10.1109/TPEL.2014.2332503