TY - GEN
T1 - Light load efficiency improvement for AC/DC boost PFC converters by digital multi-mode control method
AU - Wang, Wei Shung
AU - Tzou, Ying-Yu
PY - 2011/12/1
Y1 - 2011/12/1
N2 - This paper presents a method to improve light load efficiency and reduce the THD of input current of a boost PFC converter used in applications to high performance server power supply units. The conventional constant frequency average current mode control scheme will result lower efficiency and high THD current distortion under light load operation. To overcome this problem, this paper proposes a digital multi-mode control scheme with variable switching frequency control. A nonlinear control scheme with modified gain scheduling has been used to improve dynamic response under light load condition with discontinuous conduction mode (DCM) operation with lower switching frequency. A green mode controller has been developed to change its control mode based on the required line current command under various load conditions. The proposed control scheme has been verified by using simulation and realized by using a DSP TMS32028035 in applications to a single-phase 675W boost PFC AC/DC converter. Experimental results are given to illustrate the feasibility of the proposed control scheme.
AB - This paper presents a method to improve light load efficiency and reduce the THD of input current of a boost PFC converter used in applications to high performance server power supply units. The conventional constant frequency average current mode control scheme will result lower efficiency and high THD current distortion under light load operation. To overcome this problem, this paper proposes a digital multi-mode control scheme with variable switching frequency control. A nonlinear control scheme with modified gain scheduling has been used to improve dynamic response under light load condition with discontinuous conduction mode (DCM) operation with lower switching frequency. A green mode controller has been developed to change its control mode based on the required line current command under various load conditions. The proposed control scheme has been verified by using simulation and realized by using a DSP TMS32028035 in applications to a single-phase 675W boost PFC AC/DC converter. Experimental results are given to illustrate the feasibility of the proposed control scheme.
KW - Digital Multi-Mode Control Method
KW - Green Mode Controller
KW - Light Load Efficiency
KW - Power Factor Correction
UR - http://www.scopus.com/inward/record.url?scp=84863182022&partnerID=8YFLogxK
U2 - 10.1109/PEDS.2011.6147385
DO - 10.1109/PEDS.2011.6147385
M3 - Conference contribution
AN - SCOPUS:84863182022
SN - 9781612849997
T3 - Proceedings of the International Conference on Power Electronics and Drive Systems
SP - 1025
EP - 1030
BT - 2011 IEEE 9th International Conference on Power Electronics and Drive Systems, PEDS 2011
Y2 - 5 December 2011 through 8 December 2011
ER -