TY - JOUR
T1 - Mitigating Line Frequency Instability of Boost PFC Converter under Proportional Outer-Voltage Loop with Additional Third Current-Harmonic Feedforward Compensation
AU - Lu, Weiguo
AU - Han, Jinxin
AU - Li, Shaoling
AU - Iu, Herbert Ho Ching
PY - 2019/7/12
Y1 - 2019/7/12
N2 - For the average current mode (ACM)-controlled boost power factor correction (PFC) converter, there is line frequency instability under light load and small output capacitor conditions. The line frequency instability is characterized as self-oscillation in the form of period-doubling, which drastically increases the total harmonic distortion (THD) and additional losses. Regarding this line frequency instability, this paper proposes a stability control scheme incorporating an outer-voltage proportional controller and an additional third current-harmonic feedforward compensation (TCFC). Specifically, the outer-voltage proportional controller replaces the traditional low-pass filter (LPF) to mitigate the line frequency instability, and the TCFC aims to ensure an acceptable THD. Moreover, the dynamic response of the proposed current-feedforward-based stability control scheme outperforms the existing voltage-feedback-based schemes. Furthermore, the control parameters are determined by the harmonic averaged model, and the feasibility of the proposed scheme is verified by experiments based on IC UC3854BN. The experimental results demonstrate that the THD with the line frequency instability is 56.60%, while it is improved to 15.58% by using the proposed scheme.
AB - For the average current mode (ACM)-controlled boost power factor correction (PFC) converter, there is line frequency instability under light load and small output capacitor conditions. The line frequency instability is characterized as self-oscillation in the form of period-doubling, which drastically increases the total harmonic distortion (THD) and additional losses. Regarding this line frequency instability, this paper proposes a stability control scheme incorporating an outer-voltage proportional controller and an additional third current-harmonic feedforward compensation (TCFC). Specifically, the outer-voltage proportional controller replaces the traditional low-pass filter (LPF) to mitigate the line frequency instability, and the TCFC aims to ensure an acceptable THD. Moreover, the dynamic response of the proposed current-feedforward-based stability control scheme outperforms the existing voltage-feedback-based schemes. Furthermore, the control parameters are determined by the harmonic averaged model, and the feasibility of the proposed scheme is verified by experiments based on IC UC3854BN. The experimental results demonstrate that the THD with the line frequency instability is 56.60%, while it is improved to 15.58% by using the proposed scheme.
KW - Average current mode
KW - boost PFC converter
KW - line frequency instability
KW - proportional outer-voltage loop
KW - third current-harmonic feedforward compensation
UR - http://www.scopus.com/inward/record.url?scp=85077471018&partnerID=8YFLogxK
U2 - 10.1109/TCSI.2019.2925663
DO - 10.1109/TCSI.2019.2925663
M3 - Article
AN - SCOPUS:85077471018
VL - 66
SP - 4528
EP - 4541
JO - IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS-I : REGULAR PAPERS
JF - IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS-I : REGULAR PAPERS
SN - 1549-8328
IS - 11
M1 - 8760533
ER -