TITLE:
Comparisons between CRM and CCM PFC
AUTHORS:
Weiping Zhang, Wei Zhang, Jianbo Yang, Faris Al-Naemi
KEYWORDS:
CRM; CCM; PFC; Boost
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.4B,
November
11,
2013
ABSTRACT: The paper presents detailed comparisons between CRM
(critical conduction mode) and CCM (continuous conduction mode) control schemes
used for Boost PFC converter. The two schemes are analyzed and compared under
the chips of L6561 and UC 3854 which are commonly used for CRM and CCM
respectively. Both schemes are based on multiplier; however, the CCM is more
complex and needs more periphery components which increase the cost. The Boost
PFC under CRM is easier to be implemented. Nevertheless, the variable switch
frequency makes the system (including the power-stage inductor and capacitor)
hard to design. It seems that the CRM PFC is more attractive in low power
applications which only need to meet IEC61000-3-2
D standard. Some experiment results are also presented for the comparison.