What are the advantages and disadvantages of DCM compared with CCM PFC control?

Mainly cost-effectiveness is in control.

Low power-medium power-high power-extra high power

DCM——CRM——CCM——Multiphase Interleaving

The discontinuous mode is relatively simple. The diode can be a silicon power diode. The cost is low. The peak current control scheme is generally used. The disadvantage is that the peak current of the switch tube is relatively low when the output power is the same, the current RMS value of the current is relatively large, and the conduction loss is slightly Larger, suitable for high cost, low power applications.

Continuous mode control is more complicated. Generally, there are more control schemes such as average current. The diode requires the use of SIC diodes without reverse recovery. The cost is higher. When the output power is the same, the peak value of the switch tube current is small, and the current RMS value is small. , The conduction loss is slightly smaller, which is suitable for higher power applications.

Exception: In continuous mode, the input inductor current is continuous, and EMI will be slightly better.

The ripple current of high-voltage capacitors will be large. I know this. I heard that it is easy to produce audible high-frequency sound.